haiku/docs/user/interface/View.dox

/*
 * Copyright 2011-2013 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *		John Scipione, jscipione@gmail.com
 *
 * Corresponds to:
 *		headers/os/interface/View.h	 hrev45799
 *		src/kits/interface/View.cpp	 hrev45799
 */


/*!
	\file View.h
	\ingroup interface
	\ingroup libbe
	\brief BView class definition and support data structures.
*/


// mouse buttons


/*!
	\var B_PRIMARY_MOUSE_BUTTON

	Primary mouse button mask parameter.
*/


/*!
	\var B_SECONDARY_MOUSE_BUTTON

	Secondary mouse button mask parameter.
*/


/*!
	\var B_TERTIARY_MOUSE_BUTTON

	Tertiary mouse button mask parameter.
*/


// mouse transit


/*!
	\var B_ENTERED_VIEW

	Mouse transit entered view.
*/


/*!
	\var B_INSIDE_VIEW

	Mouse transit inside view.
*/


/*!
	\var B_EXITED_VIEW

	Mouse transit exited view.
*/


/*!
	\var B_OUTSIDE_VIEW

	Mouse transit outside view.
*/


// event mask


/*!
	\var B_POINTER_EVENTS

	Mouse pointer events mask parameter.
*/


/*!
	\var B_KEYBOARD_EVENTS

	Keyboard events mask parameter.
*/


// event mask options


/*!
	\var B_LOCK_WINDOW_FOCUS

	Prevents the attached window from losing its focused state while the mouse is
	held down.
*/


/*!
	\var B_SUSPEND_VIEW_FOCUS

	Events normally sent to the focus view are suppressed.
*/


/*!
	\var B_NO_POINTER_HISTORY

	Send only the most recent MouseMoved() event to the view.

	\note New in Haiku: unless this flag is specified, both BWindow and
	      BView::GetMouse() will filter out older mouse moved messages.
*/


/*!
	\var B_FULL_POINTER_HISTORY

	Send all MouseMoved() events to the view.
*/


// event tracking


/*!
	\var B_TRACK_WHOLE_RECT

	The whole rectangle moves with the cursor.
*/


/*!
	\var B_TRACK_RECT_CORNER

	The left top corner is fixed while the right and bottom edges move with the
	cursor.
*/


// set font mask


/*!
	\var B_FONT_FAMILY_AND_STYLE

	Font family and style mask parameter.
*/


/*!
	\var B_FONT_SIZE

	Font size mask parameter.
*/


/*!
	\var B_FONT_SHEAR

	Font shear mask parameter.
*/


/*!
	\var B_FONT_ROTATION

	Font rotation mask parameter.
*/


/*!
	\var B_FONT_SPACING

	Font spacing mask parameter.
*/


/*!
	\var B_FONT_ENCODING

	Font encoding mask parameter.
*/


/*!
	\var B_FONT_FACE

	Font face mask parameter.
*/


/*!
	\var B_FONT_FLAGS

	Font flags mask parameter.
*/


/*!
	\var B_FONT_FALSE_BOLD_WIDTH

	Font false bold width mask parameter.
*/


/*!
	\var B_FONT_ALL

	Font all properties mask parameter.
*/


// view flags


/*!
	\var B_FULL_UPDATE_ON_RESIZE

	Redraw the entire view on resize.
*/


/*!
	\var _B_RESERVED1_

	Reserved for future use.
*/


/*!
	\var B_WILL_DRAW

	Indicates that the view will do it's own drawing.
*/


/*!
	\var B_PULSE_NEEDED

	Indicates that the view accepts Pulse() messages.
*/


/*!
	\var B_NAVIGABLE_JUMP

	Indicates this is the default keyboard navigation view.
*/

/*!
	\var B_FRAME_EVENTS

	View responds to frame move and resize events.
*/


/*!
	\var B_NAVIGABLE

	The view is able to receive focus for keyboard navigation. Typically focus is
	indicated by drawing a blue rectangle around the view.
*/


/*!
	\var B_SUBPIXEL_PRECISE

	The view draws with sub-pixel precision.
*/


/*!
	\var B_DRAW_ON_CHILDREN

	Indicates that the view responds to the DrawAfterChildren() hook method.
*/


/*!
	\var B_INPUT_METHOD_AWARE

	Allows the view to use input method add-ons to gain access to the input
	methods needed for Japanese and other languages.
*/


/*!
	\var _B_RESERVED7_

	Reserved for future use.
*/


/*!
	\var B_SUPPORTS_LAYOUT

	The view supports the layout APIs, i.e. it doesn't require an explicit frame
	rectangle to be specified.
*/


/*!
	\var B_INVALIDATE_AFTER_LAYOUT

	Indicates that the view should be redraw after being added to a layout.
*/


// resize mask variables, internal variables but are in a public header.


/*!
	\var _RESIZE_MASK_

	Resize mask. Do not use.
*/


/*!
	\var _VIEW_TOP_

	View top mask variable. Do not use.
*/


/*!
	\var _VIEW_LEFT_

	View left mask variable. Do not use.
*/


/*!
	\var _VIEW_BOTTOM_

	View bottom mask variable. Do not use.
*/


/*!
	\var _VIEW_RIGHT_

	View right mask variable. Do not use.
*/


/*!
	\var _VIEW_CENTER_

	View center mask variable. Do not use.
*/


/*!
	\fn inline uint32 _rule_(uint32 r1, uint32 r2, uint32 r3, uint32 r4)
	\brief Internal function, do not use.
*/


// resize mask


/*!
	\var B_FOLLOW_NONE

	Follow none resize mask parameter. Equivalent to \c B_FOLLOW_LEFT
	| \c B_FOLLOW_TOP. The view maintains its position in its parent's
	coordinate system but not in the screen coordinate system.
*/


/*!
	\var B_FOLLOW_ALL_SIDES

	Follow all sides resize mask parameter. Equivalent to \c B_FOLLOW_LEFT_RIGHT |
	\c B_FOLLOW_TOP_BOTTOM. The view will be resized with its parent view both
	horizontally and vertically.
*/


/*!
	\var B_FOLLOW_ALL

	Equivalent to \c B_FOLLOW_ALL_SIDES.
*/


// horizontal resize mask


/*!
	\var B_FOLLOW_LEFT

	The margin between the left side of the view and the left side of its parent
	remains constant.
*/


/*!
	\var B_FOLLOW_RIGHT

	The margin between the right side of the view and the right side of its parent
	remains constant.
*/


/*!
	\var B_FOLLOW_LEFT_RIGHT

	The margin between the left and right sides of the view and the left and right
	sides of its parent both remain constant.
*/


/*!
	\var B_FOLLOW_H_CENTER

	The view maintains a constant relationship to the horizontal center of its
	parent view.
*/


// vertical resize mask


/*!
	\var B_FOLLOW_TOP

	The margin between the top of the view and the top of its parent remains
	constant.
*/


/*!
	\var B_FOLLOW_BOTTOM

	The margin between the bottom of the view and the bottom of its parent remains
	constant.
*/


/*!
	\var B_FOLLOW_TOP_BOTTOM

	The margin between the top and bottom sides of the view and the top and bottom
	sides of its parent both remain constant.
*/


/*!
	\var B_FOLLOW_V_CENTER

	The view maintains a constant relationship to the vertical center of its
	parent view.
*/


/*!
	\class BView
	\ingroup interface
	\ingroup libbe
	\brief View base class.

	A BView is a rectangular area within a window that responds to mouse clicks
	and key presses, and acts as a surface for you to draw on.

	Most Interface Kit classes, with the notable exception of BWindow inherit from
	BView. Some of the time you might use a BView object as is, but most of the
	time you subclass BView to do something unique.

	To create a subclass of BView you generally override one or more of BView's
	hook methods to respond to user events such as MouseDown() or FrameMoved().
	By default a BView does nothing in it's hook methods unless otherwise stated,
	it's up to you to define what happens. To override the look of a BView you
	should override the Draw() or DrawAfterChildren() methods. See the section on
	Hook Methods below for more details.

	When a BView object is first created it has no parent or child views. How you
	add a view to the view hierarchy depends on if you want to use a standard
	view with a defined frame rectangle or to use the Layout APIs to position and
	size your view instead.

	If you create a standard view you need to add it to a window or another view
	using the AddChild() method, if you create a layout view you need to add your
	view to a layout using BLayout::AddView() or by adding it to a layout builder.

	Views are not very interesting until they, or one of their parents, are
	attached to a window as many of BView's methods depend on a connection to the
	App Server to do their work. In order to prevent multiple views from altering
	the window simultaneously though locking is required. To perform an action
	while the window is locked you issue the following code:

\code
if (Window()->LockLooper()) {
	...
	Window()->UnlockLooper()
}
\endcode

	Whenever App Server calls a hook method it automatically locks the BWindow for
	you.

	Only one view attached to a window is able to receive keyboard events at a
	time. The view that is able to receive keyboard events such as KeyDown() is
	called the "focus view". MakeFocus() gives or removes focus from a view.
	Call IsFocus() to determine whether or not the view is the window's current
	focus view.

	When a view has focus an indicator should be drawn to inform the user. Typically
	the view is surrounded by a blue rectangle to indicate that it is the window's
	focus view. The color can be queried using the keyboard_navigation_color()
	function in InterfaceDefs.h

	Each view has it's own coordinate system with the origin point (0.0, 0.0)
	located at the top left corner. You can convert a BPoint or BRect to or from
	the view's coordinate system to the coordinate system of it's parent, or
	of the screen's coordinate system. See the section on Coordinate Conversion
	Methods for more details.

	The Application Server clips a BView to the region where it's permitted to
	draw which is never larger than the view's bound rectangle. A view can never
	draw outside its bounds nor can it draw outside of the bounds rectangle of any
	parent view.

	You may limit the clipping region further by passing a BRegion object to
	ConstrainClippingRegion(). You can obtain the current clipping region by
	calling GetClippingRegion().

	Each view has a ViewColor() that fills the frame rectangle before the
	view does any drawing of its own. The default view color is white, you may
	change the view color by calling SetViewColor(). A commonly used view color
	is \c B_PANEL_BACKGROUND_COLOR which is a grey color used as the view color
	of many Interface Kit classes. If you set the view color to
	\c B_TRANSPARENT_COLOR then the Application Server won't erase the clipping
	region of the view before updating, this should only be used if the view
	erases itself by drawing on every pixel in the clipping region.

	If you want to set the view color of a view to be the same as its parent you
	need to set it within the AttachedToWindow() method of the view like so:

\code
SetViewColor(Parent()->ViewColor());
\endcode
*/


/*!
	\fn BView::BView(const char* name, uint32 flags, BLayout* layout)
	\brief Layout constructor.

	To be used as part of a BLayout. You may use the Layout Methods found below
	to set the size and alignment constraints of the view.

	\c B_SUPPORTS_LAYOUT is automatically set to the view. The view flags can be
	set after the view has been constructed by calling the SetFlags() methods.

	\param name The name of the view, can be \c NULL.
	\param flags The view flags, a mask of one or more of the following:
	       - \c B_FULL_UPDATE_ON_RESIZE Redraw the entire view on resize.
	       - \c B_WILL_DRAW Indicates that the view will do it's own drawing.
	       - \c B_PULSE_NEEDED The view accepts Pulse() messages.
	       - \c B_NAVIGABLE_JUMP Default for keyboard navigation.
	       - \c B_FRAME_EVENTS Responds to move and resize events.
	       - \c B_NAVIGABLE Able to receive keyboard navigation focus.
	       - \c B_SUBPIXEL_PRECISE Draws with sub-pixel precision.
	       - \c B_DRAW_ON_CHILDREN Responds to DrawAfterChildren().
	       - \c B_INPUT_METHOD_AWARE Allows access input method add-ons.
	       - \c B_SUPPORTS_LAYOUT Supports the layout APIs, i.e. it doesn't
	            use a frame rectangle.
	       - \c B_INVALIDATE_AFTER_LAYOUT Is redraw after added to a layout.
	\param layout A \a layout to set the view to.
*/


/*!
	\fn BView::BView(BRect frame, const char* name, uint32 resizingMode,
		uint32 flags)
	\brief Standard constructor.

	A newly constructed BView object has no parent, you must assign it one by
	passing it into the AddChild() method of another view or window. Once the
	view or a parent view has been attached to a window the view becomes part of
	that window's view hierarchy.

	When the BView object is added as a child the \a frame values are interpreted
	in the parent's coordinate system. The frame rectangle should be specified in
	integral values to align on pixel boundaries, decimal values will be rounded.

	The resizing mode flags and view flags can be set after the view has been
	constructed by calling the SetResizingMode() and SetFlags() methods.

	\param frame The \a frame rectangle of the view.
	\param name The name of the view, can be \c NULL.
	\param resizingMode Defines the view's behavior of the when its parent is
	       resized.
	       \n\n It combines one of the following horizontal resizing constants:
	       \li \c B_FOLLOW_TOP The margin between the top of the view and the top
	           of its parent remains constant.
	       \li \c B_FOLLOW_BOTTOM The margin between the bottom of the view and
	           the bottom of its parent remains constant.
	       \li \c B_FOLLOW_TOP_BOTTOM The margin between the top and bottom sides
	           of the view and the top and bottom sides of the parent both remain
	           constant.
	       \li \c B_FOLLOW_V_CENTER Maintains a constant relationship to the
	           vertical center of the parent view.

	       with one of the following vertical resizing constants:
	       \li \c B_FOLLOW_LEFT The margin between the left side of the view and
	           the left side of its parent remains constant.
	       \li \c B_FOLLOW_RIGHT The margin between the right side of the view and
	            the right side of the parent remains constant.
	       \li \c B_FOLLOW_LEFT_RIGHT The margin between the left and right sides
	           of the view and the left and right sides of its parent both remain
	           constant.
	       \li \c B_FOLLOW_H_CENTER The view maintains a constant relationship to
	            the horizontal center of the parent view.

	       or use one of the following combined horizontal/vertical constants:
	       \li \c B_FOLLOW_NONE Equivalent to \c B_FOLLOW_LEFT | \c B_FOLLOW_TOP.
	       \li \c B_FOLLOW_ALL_SIDES Equivalent to
	            \c B_FOLLOW_LEFT_RIGHT | \c B_FOLLOW_TOP_BOTTOM.
	\param flags The view flags, a mask of one or more of the following:
	       - \c B_FULL_UPDATE_ON_RESIZE Redraw the entire view on resize.
	       - \c B_WILL_DRAW Indicates that the view will do it's own drawing.
	       - \c B_PULSE_NEEDED The view accepts Pulse() messages.
	       - \c B_NAVIGABLE_JUMP Default for keyboard navigation.
	       - \c B_FRAME_EVENTS Responds to move and resize events.
	       - \c B_NAVIGABLE Able to receive keyboard navigation focus.
	       - \c B_SUBPIXEL_PRECISE Draws with sub-pixel precision.
	       - \c B_DRAW_ON_CHILDREN Responds to DrawAfterChildren().
	       - \c B_INPUT_METHOD_AWARE Allows access input method add-ons.
	       - \c B_SUPPORTS_LAYOUT Supports the layout APIs, i.e. it doesn't
	            use a frame rectangle.
	       - \c B_INVALIDATE_AFTER_LAYOUT Is redraw after added to a layout.
*/


/*!
	\fn BView::BView(BMessage* archive)
	\brief Archive constructor.

	\param archive The data \a archive message to construct the view from.
*/


/*!
	\fn BView::~BView()
	\brief Destructor method.

	Deletes the view and all children freeing any memory used.
*/


/*!
	\name Archiving
*/


//! @{


/*!
	\fn BArchivable* BView::Instantiate(BMessage* data)
	\brief Creates a new BView object from the \a data message.

	\returns A newly created BView object or \c NULL if the message doesn't
		contain an archived BView object.
*/


/*!
	\fn status_t BView::Archive(BMessage* data, bool deep) const
	\brief Archives the object into the \a data message.

	\param data A pointer to the BMessage object to archive the object into.
	\param deep Whether or not to archive child views as well.

	\return A status code, \c B_OK if everything went well or an error code
	        otherwise.
	\retval B_OK The object was archived successfully.
	\retval B_NO_MEMORY Ran out of memory while archiving the object.
*/


//! @}


/*!
	\name Hook Methods
*/


//! @{


/*!
	\fn status_t BView::AllUnarchived(const BMessage* from)
	\brief Hook method called when all views have been unarchived.

	The default implementation does nothing.
*/


/*!
	\fn status_t BView::AllArchived(BMessage* into) const
	\brief Hook method called when all views have been archived.

	The default implementation does nothing.
*/


/*!
	\fn void BView::AttachedToWindow()
	\brief Hook method that is called when the object is attached to a
		window.

	The default implementation does nothing.
*/


/*!
	\fn void BView::AllAttached()
	\brief Similar to AttachedToWindow() but this method is triggered after
		all child views have already been attached to a window.

	The default implementation does nothing.
*/


/*!
	\fn void BView::DetachedFromWindow()
	\brief Hook method that is called when the object is detached from a
		window.

	The default implementation does nothing.
*/


/*!
	\fn void BView::AllDetached()
	\brief Similar to AttachedToWindow() but this method is triggered after
		all child views have already been detached from a window.

	The default implementation does nothing.
*/


/*!
	\fn void BView::Draw(BRect updateRect)
	\brief Draws the area of the view that intersects \a updateRect.

	Derived classes should override this method to draw their view.

	\remark This is an hook method called by the Interface Kit, you don't have to
	        call it yourself. If you need to forcefully redraw the view consider
	        calling Invalidate() instead.

	\param updateRect The rectangular area to be drawn.

	The default implementation does nothing.
*/


/*!
	\fn void BView::DrawAfterChildren(BRect r)
	\brief Perform any drawing that needs to be done after child view have
		already been drawn.

	\param r The rectangular area to be drawn.

	The default implementation does nothing.
*/


/*!
	\fn void BView::FrameMoved(BPoint newPosition)
	\brief Hook method that gets called when the view is moved.

	\param newPosition The point of the top left corner of the frame
		that the view has been moved to.

	The default implementation does nothing.
*/


/*!
	\fn void BView::FrameResized(float newWidth, float newHeight)
	\brief Hook method that gets called when the view is resized.

	\param newWidth The new \a width of the view.
	\param newHeight The new \a height of the view.

	The default implementation does nothing.
*/


/*!
	\fn void BView::KeyDown(const char* bytes, int32 numBytes)
	\brief Hook method that is called when a keyboard key is pressed.

	\param bytes The bytes of the key combination pressed.
	\param numBytes The number of bytes in \a bytes.

	The default implementation sets keyboard navigation focus.
*/


/*!
	\fn void BView::KeyUp(const char* bytes, int32 numBytes)
	\brief Hook method that is called when a keyboard key is released.

	\param bytes The bytes of the key combination pressed.
	\param numBytes The number of bytes in \a bytes.

	The default implementation does nothing.
*/


/*!
	\fn void BView::MessageReceived(BMessage* message)
	\brief Handle \a message received by the associated looper.

	\param message The \a message received by the associated looper.

	\see BHandler::MessageReceived()
*/


/*!
	\fn void BView::MouseDown(BPoint where)
	\brief Hook method that is called when a mouse button is pressed.

	\param where The point on the screen where to mouse pointer is when
		the mouse button is pressed.

	The default implementation does nothing.
*/


/*!
	\fn void BView::MouseUp(BPoint where)
	\brief Hook method that is called when a mouse button is released.

	\param where The point on the screen where to mouse pointer is when
		the mouse button is released.

	The default implementation does nothing.
*/


/*!
	\fn void BView::MouseMoved(BPoint where, uint32 code,
		const BMessage* a_message)
	\brief Hook method that is called when the mouse is moved.

	The default implementation does nothing.
*/


/*!
	\fn void BView::Pulse()
	\brief Hook method that gets called when the view receives a \c B_PULSE
	       message.

	An action is performed each time the App Server calls the Pulse() method. 
	The pulse rate is set by SetPulseRate(). You can implement Pulse() to do
	anything you want. The default version does nothing. The pulse granularity
	is no better than once per 100,000 microseconds.

	The default implementation does nothing.

	\sa SetPulseRate()
*/


/*!
	\fn void BView::TargetedByScrollView(BScrollView* scrollView)
	\brief Hook method called when the view becomes the target of
	       \a scrollView.

	The default implementation does nothing.

	\param scrollView The BScrollView object that has targeted the view.
*/


/*!
	\fn void BView::WindowActivated(bool state)
	\brief Hook method called when the attached window becomes activated or
	       deactivated.

	The default implementation does nothing.

	\param state \c true if the window becomes activated, \c false if the
		window becomes deactivated.
*/


//! @}


/*!
	\fn BRect BView::Bounds() const
	\brief Returns the view frame rectangle in the view's coordinate system.

	\return The bounding rectangle of the view.
*/


/*!
	\fn BRect BView::Frame() const
	\brief Returns the frame rectangle of the view in the parent's coordinate system.

	\returns The view's frame rectangle.
*/


/*!
	\name Coordinate Conversion Methods
*/


//! @{


/*!
	\fn void BView::ConvertToParent(BPoint* point) const
	\brief Convert \a point to the parent's coordinate system in place.

	\param point A pointer to a BPoint object to convert.
*/


/*!
	\fn BPoint BView::ConvertToParent(BPoint point) const
	\brief Returns \a point converted to the parent's coordinate system.

	\param point A BPoint object to convert.

	\return A new BPoint object in the parent's coordinate system.
*/


/*!
	\fn void BView::ConvertFromParent(BPoint* point) const
	\brief Convert \a point from the parent's coordinate system to the
		   view's coordinate system in place.

	\param point A pointer to a BPoint object to convert.
*/


/*!
	\fn BPoint BView::ConvertFromParent(BPoint point) const
	\brief Returns \a point converted from the parent's coordinate system to
	       the view's coordinate system.

	\param point A BPoint object to convert.

	\return A new BPoint object in the view's coordinate system.
*/


/*!
	\fn void BView::ConvertToParent(BRect* rect) const
	\brief Convert \a rect to the parent's coordinate system in place.

	\param rect A pointer to a BRect object to convert.
*/


/*!
	\fn BRect BView::ConvertToParent(BRect rect) const
	\brief Returns \a rect converted to the parent's coordinate system.

	\param rect A BRect object to convert.

	\return A new BRect object in the parent's coordinate system.
*/


/*!
	\fn void BView::ConvertFromParent(BRect* rect) const
	\brief Convert \a rect from the parent's coordinate system to the
		   view's coordinate system in place.

	\param rect A pointer to a BRect object to convert.
*/


/*!
	\fn BRect BView::ConvertFromParent(BRect rect) const
	\brief Returns \a rect converted from the parent's coordinate system to the
		   view's coordinate system.

	\param rect A BRect object to convert.

	\return A new BRect object in the view's coordinate system.
*/


/*!
	\fn void BView::ConvertToScreen(BPoint* point) const
	\brief Convert \a point to the screen's coordinate system in place.

	\param point A pointer to a BPoint object to convert.
*/


/*!
	\fn BPoint BView::ConvertToScreen(BPoint point) const
	\brief Returns \a point converted to the screen's coordinate system.

	\param point A BPoint object to convert.

	\return A new BPoint object in the screen's coordinate system.
*/


/*!
	\fn void BView::ConvertFromScreen(BPoint* point) const
	\brief Convert \a point from the screen's coordinate system to the
		   view's coordinate system in place.

	\param point A pointer to a BPoint object to convert.
*/


/*!
	\fn BPoint BView::ConvertFromScreen(BPoint point) const
	\brief Returns \a point converted from the screen's coordinate system to
	       the view's coordinate system.

	\param point A BPoint object to convert.

	\return A new BPoint object in the view's coordinate system.
*/


/*!
	\fn void BView::ConvertToScreen(BRect* rect) const
	\brief Convert \a rect to the screen's coordinate system in place.

	\param rect A pointer to a BRect object to convert.
*/


/*!
	\fn BRect BView::ConvertToScreen(BRect rect) const
	\brief Returns \a rect converted to the screen's coordinate system.

	\param rect A BRect object to convert.

	\return A new BRect object in the screen's coordinate system.
*/


/*!
	\fn void BView::ConvertFromScreen(BRect* rect) const
	\brief Convert \a rect from the screen's coordinate system to the
		   view's coordinate system in place.

	\param rect A pointer to a BRect object to convert.
*/


/*!
	\fn BRect BView::ConvertFromScreen(BRect rect) const
	\brief Returns \a rect converted from the screen's coordinate system to the
		   view's coordinate system.

	\param rect A BRect object to convert.

	\return A new BRect object in the view's coordinate system.
*/


//! @}


/*!
	\fn uint32 BView::Flags() const
	\brief Return the view flags set in the constructor or by SetFlags().

	\return The view flags as a uint32 mask.
*/


/*!
	\fn void BView::SetFlags(uint32 flags)
	\brief Sets the view flags to the \a flags mask.

	\param flags The view flags to set as a uint32 mask.
*/


//! @}


/*!
	\fn void BView::Hide()
	\brief Hides the view without removing it from the view hierarchy.

	Calls to Hide() and Show() are cumulative. A visible view becomes hidden
	once the number of Hide() calls exceeds the number of Show() calls.

	\see BWindow::Hide()
	\see IsHidden()
*/


/*!
	\fn void BView::Show()
	\brief Shows the view making it visible.

	Calls to Hide() and Show() are cumulative. A hidden view becomes visible
	again once the number of Show() calls matches the number of Hide() calls.

	\see BWindow::Show()
	\see IsHidden()
*/


/*!
	\fn bool BView::IsFocus() const
	\brief Returns whether or not the view is the window's current focus view.

	The focus view changes as the user moves from one view to another either
	by pushing the tab key or by clicking a new view with the mouse. The change
	can be made programmatically via the MakeFocus() method.

	\returns \c true if the view is the current focus view, \c false otherwise.

	\see MakeFocus()
	\see BWindow::CurrentFocus()
*/


/*!
	\fn bool BView::IsHidden(const BView* lookingFrom) const
	\brief Returns whether or not the view is hidden from the perspective of
	       \a lookingFrom.

	A view is considered hidden if it, any of it's parent views, or the window
	it is attached to has had the Hide() method called on it. This method
	allows you to determine the hidden status of a view from a different point
	on the view hierarchy.

	\param lookingFrom The view used as a base when determining the hidden
	       status of the BView object.

	\return \c true if the view was hidden via the Hide() method, \c false
	        otherwise.
*/


/*!
	\fn bool BView::IsHidden() const
	\brief Returns whether or not the view is hidden.

	A view can be hidden either by calling Hide() on the view, calling Hide()
	on a parent view or calling Hide() on the window that the view is attached
	to. When a BWindow or BView is hidden, all its descendants are also hidden.

	This method only returns whether the view or an ancestor view has had the
	Hide() method called on it, it doesn't consider if the view is obscured
	by another view or is off-screen. A BView is not hidden by default.

	\return \c true if the view was hidden via the Hide() method, \c false
	        otherwise.
*/


/*!
	\fn bool BView::IsPrinting() const
	\brief Returns whether or not the BView object is drawing to a printer.

	This method should only be called from the Draw() or DrawAfterChildren()
	methods. If called from any other method this method returns \c false.

	The view may choose different fonts, images, or colors when drawing to a
	printer vs. when drawing to the screen.

	\return Returns \c true if drawing to a printer, \c false otherwise.
*/


/*!
	\fn BPoint BView::LeftTop() const
	\brief Returns the left top corner point.

	\return The left top corner of the view as a BPoint object.
*/


/*!
	\fn void BView::SetResizingMode(uint32 mode)
	\brief Sets the resizing mode of the view according to the \a mode mask.

	The resizing mode is first set in the BView constructor.

	\see SetFlags()
*/


/*!
	\fn uint32 BView::ResizingMode() const
	\brief Returns the resizing mode flags mask set in the constructor or by
	       SetResizingMode().

	\returns the current resizing mode flags as a uint32 mask.
*/


/*!
	\fn void BView::SetViewCursor(const BCursor* cursor, bool sync)
	\brief Assigns \a cursor to the view.

	This cursor will be displayed when the mouse is positioned inside the view.

	\param cursor The BCursor object to assign to the view.
	\param sync If \c true App Server is synchronized immediately forcing the
	       change to occur. If \c false, the change will be put in the queue and
	       will take effect when the pending requests are processed. 
*/


/*!
	\fn void BView::Flush() const
	\brief Flushes the attached window's connection to App Server.

	If the view isn't attached to a window, Flush() does nothing.
*/


/*!
	\fn void BView::Sync() const
	\brief Synchronizes the attached window's connection to App Server.

	\warning If the view isn't attached to a window, Sync() might crash the
	         application.
*/


/*!
	\fn BWindow* BView::Window() const
	\brief Returns the window the view is attached to.

	\return The window the view is attached to or \c NULL if the view isn't
	attached to a window.
*/


/*!
	\fn void BView::GetPreferredSize(float* _width, float* _height)
	\brief Fill out the preferred width and height of the view
		into the \a _width and \a _height parameters.

	Derived classes should override this method to set the preferred
	size of object.

	\remark Either the \a _width or \a _height parameter may be set to \c NULL
		    if you only want to get the other one.

	\param[out] _width Pointer to a \c float to store the width of the view.
	\param[out] _height Pointer to a \c float to store the height of the view.
*/


/*!
	\fn void BView::ResizeToPreferred()
	\brief Resizes the view to its preferred size keeping the left top corner
	       constant.
*/


/*!
	\name Input Related Methods
*/


//! @{


/*!
	\fn void BView::BeginRectTracking(BRect startRect, uint32 style)
	\brief Displays an outline rectangle on the view and initiates tracking.

	This method is typically called from the MouseDown() while EndRectTracking()
	is typically called from the MouseUp method().

	\param startRect The initial frame in the view's coordinate system.
	\param style This parameter is set to one of the following:
	- \c B_TRACK_WHOLE_RECT The position of the rect changes with the cursor
	     while its size remains the same.
	- \c B_TRACK_RECT_CORNER The left top corner is fixed while the right and
	     bottom edges move with the cursor.
*/


/*!
	\fn void BView::EndRectTracking()
	\brief Ends tracking removing the outline rectangle from the view.

	BeginRectTracking() is typically called from the MouseDown() while this
	method is typically called from the MouseUp() method.
*/


/*!
	\fn void BView::DragMessage(BMessage* message, BRect dragRect,
		BHandler* replyTo)
	\brief Initiates a drag-and-drop session.

	This method only works if the BView objects are attached to a window.

	\param message Contains data to be dragged and dropped on the destination
	       view. The caller retains responsibility for this object.
	\param dragRect An outline rectangle used in place of a bitmap image set in
	       the view's coordinate system.
	\param replyTo The target set to handle the message sent in reply to the
	       dragged message. If \c NULL the reply is instead directed to the
	       BView object that initiated the drag-and-drop session.
*/


/*!
	\fn void BView::DragMessage(BMessage* message, BBitmap* image,
		BPoint offset, BHandler* replyTo)
	\brief Initiates a drag-and-drop session of an \a image.

	This method only works if the BView objects are attached to a window.

	\param message Contains data to be dragged and dropped on the destination
	       view. The caller retains responsibility for this object.
	\param image Bitmap image dragged by the user. The memory used by the bitmap
	       is freed automatically when the message is dropped.
	\param offset The offset to the hotspot within the image in the bitmap's
	       coordinate system.
	\param replyTo The target set to handle the message sent in reply to the
	       dragged message. If \c NULL the reply is instead directed to the
	       BView object that initiated the drag-and-drop session.
*/


/*!
	\fn void BView::DragMessage(BMessage* message, BBitmap* image,
		drawing_mode dragMode, BPoint offset, BHandler* replyTo)
	\brief Initiates a drag-and-drop session of an \a image with drawing_mode
	       set by \a dragMode.

	This method only works if the BView objects are attached to a window.

	\param message Contains data to be dragged and dropped on the destination
	       view. The caller retains responsibility for this object.
	\param image Bitmap image dragged by the user. The memory used by the bitmap
	       is freed automatically when the message is dropped.
	\param dragMode Sets the drawing_mode used to draw the dragged image. Set to
	       \c B_OP_ALPHA to drag-and-drop partially transparent images.
	\param offset The offset to the hotspot within the image in the bitmap's
	       coordinate system.
	\param replyTo The target set to handle the message sent in reply to the
	       dragged message. If \c NULL the reply is instead directed to the
	       BView object that initiated the drag-and-drop session.
*/


/*!
	\fn void BView::GetMouse(BPoint* _location, uint32* _buttons,
		bool checkMessageQueue)
	\brief Fills out the cursor location and the current state of the mouse
	       buttons.

	The cursor doesn't have to be located within the view for this method to work,
	however, the view must be attached to a window. Don't use this method to track
	the mouse in your derived view, implement MouseMoved() instead.

	\param[out] _location Filled out with the cursor location in the view's
	            coordinate system.
	\param[out] _buttons Filled out with a mask of the following values:
	            - \c B_PRIMARY_MOUSE_BUTTON
	            - \c B_SECONDARY_MOUSE_BUTTON
	            - \c B_TERTIARY_MOUSE_BUTTON
	\param checkMessageQueue If \c true pull from any pending MouseMoved() or
	       MouseUp() events in the message queue top down before filling out
	       the current mouse cursor state.
*/


/*!
	\fn void BView::MakeFocus(bool focusState)
	\brief Makes the view the current focus view of the window or gives up
	       being the focus view of the window.

	The focus view handles selections and KeyDown events when the the attached
	window is active. There can be only one focus view at a time per window.

	When called with \a focusState set to \c true this method first calls
	MakeFocus() on the previously focused view with \a focusState set to
	\c false.

	The focus doesn't automatically change when MouseDown is called so calling
	MakeFocus() is the only way to make a view the focus view of a window.
	Classes derived from BView that can display the current selection, or that
	can accept pasted data should call MakeFocus() in their MouseDown() method
	to update the focus view of the window on click.

	If the view isn't attached to a window this method has no effect.

	\param focusState \a true to set focus, \a false to remove it.
*/


/*!
	\fn BScrollBar* BView::ScrollBar(orientation posture) const
	\brief Returns the BScrollBar object that has the BView set as its target.

	\param posture Either \c B_VERTICAL to get the vertical scroll bar or
	       \c B_HORIZONTAL to get the horizontal scroll bar.

	\returns the Scrollbar object requested or \c NULL if none found.

	\see BScrollBar::SetTarget()
*/


/*!
	\fn void BView::ScrollBy(float deltaX, float deltaY)
	\brief Scroll the view by \a deltaX horizontally and \a deltaY vertically.

	\param deltaX The amount to scroll horizontally.
	\param deltaY The amount to scroll vertically.
*/


/*!
	\fn void BView::ScrollTo(BPoint where)
	\brief Scroll the view to the point specified by \a where.

	\param where The location to scroll the view to.
*/


/*!
	\fn status_t BView::SetEventMask(uint32 mask, uint32 options)
	\brief Sets whether or not the view can accept mouse and keyboard
	       events when not in focus.

	If \a mask includes \c B_POINTER_EVENTS then the view will receive mouse
	events even when the mouse isn't over the view and if it includes
	\c B_KEYBOARD_EVENTS the view will receive keyboard events even if it
	isn't in focus.

	The \a options mask options are as follows:
	- \c B_NO_POINTER_HISTORY Tells App Server to only send the most recent
	     MouseMoved() event to the view sacrificing some granularity.
    - \c B_FULL_POINTER_HISTORY Tells App Server to send all MouseMoved()
	     events to the view.

	\param mask The \a mask of \c B_POINTER_EVENTS and \c B_KEYBOARD_EVENTS
	       to set.
	\param options Sets other event-handling options.

	\return \c B_OK if everything went fine or an error code, usually
	        \c B_ERROR if something went wrong.
*/


/*!
	\fn uint32 BView::EventMask()
	\brief Returns the current event mask.

	\return The current event mask as a uint32.
*/


/*!
	\fn status_t BView::SetMouseEventMask(uint32 mask, uint32 options)
	\brief Sets whether or not the view can accept mouse and keyboard
	       events when not in focus from within MouseDown() until the
	       following MouseUp() event.

	The \a options mask options are as follows:
	- \c B_NO_POINTER_HISTORY Tells App Server to send only the most recent
	     MouseMoved() event to the view sacrificing mouse movement granularity.
    - \c B_FULL_POINTER_HISTORY Tells App Server to send all MouseMoved()
	     events to the view.
	- \c B_SUSPEND_VIEW_FOCUS Events normally sent to the focus view are
	     suppressed. While the mouse is held down, the keyboard is ignored.
	     The view receiving the MouseDown() messages doesn't have to be the
	     focus view to suppress focused messages.
	- \c B_LOCK_WINDOW_FOCUS Prevents the attached window from losing its
	     focused state while the mouse is held down, even if the mouse leaves
	     the bounds of the window.

	\param mask The \a mask of \c B_POINTER_EVENTS and \c B_KEYBOARD_EVENTS
	       to set.
	\param options Sets other event-handling options.

	\return \c B_OK if everything went fine or an error code, usually
	        \c B_ERROR if something went wrong.
*/


//! @}


/*!
	\name Graphics State Methods
*/


//! @{


/*!
	\fn void BView::PushState()
	\brief Saves the drawing state to the stack.

	The drawing state contains the following elements:
	- local and global origins
	- local and global scales
	- local and global clipping regions
	- the current drawing mode
	- pen size and location
	- the font context
	- foreground and background color
	- line cap and join modes
	- miter limit
	- stipple pattern

	A new state context is created after PushState() is called with a local scale
	at 0, a local origin at (0, 0), and no clipping region.
*/


/*!
	\fn void BView::PopState()
	\brief Restores the drawing state from the stack.
*/


/*!
	\fn void BView::SetOrigin(BPoint pt)
	\brief Sets the origin in the view's coordinate system.

	\param pt The point to set the origin to.
*/


/*!
	\fn void BView::SetOrigin(float x, float y)
	\brief Sets the origin in the view's coordinate system.

	\param x The x-coordinate to set the origin to.
	\param y The y-coordinate to set the origin to.
*/


/*!
	\fn BPoint BView::Origin() const
	\brief Returns the origin point in the view's coordinate system.

	\return The local origin point in the view's coordinate system.
*/


/*!
	\fn void BView::SetScale(float scale) const
	\brief Sets the scale of the coordinate system the view uses for drawing.

	The default scale is 1.0. A \a scale value lower than 1.0 reduces the size of
	the drawing coordinate system, a \a scale value greater than 1.0 magnifies
	the coordinate system; for example, a \a scale value of 0.5 cuts the drawing
	drawing area in half moving the drawing closer to the origin while a \a scale
	value of 2.0 doubles the drawing area and moving it away from the origin.

	Updating the \a scale of view won't update previously drawn elements.

	SetScale() calls are not commutative unless you call them across different
	drawing states as the following:

\code
	view->SetScale(2);
	view->SetScale(2);
	// view's scale is 2

	view2->SetScale(2);
	view2->PushState();
	view2->SetScale(2);
	// view2's scale is 4
\endcode

	/param scale The scale factor to set.
*/


/*!
	\fn float BView::Scale() const
	\brief Return the current drawing scale.

	\return The current drawing scale.
*/


/*!
	\fn void BView::SetLineMode(cap_mode lineCap, join_mode lineJoin,
		float miterLimit)
	\brief Set line mode to use PostScript-style line cap and join modes.

	\a lineCap determines the shape of the endpoints of stroked paths while
	\a lineJoin determines the shape of the corners where two lines meet.

	The default miter limit is 10.0 which gives an angle of 11.478341°.

	\param lineCap One of the following:
	- \c B_ROUND_CAP A semicircle with diameter of line width is drawn at the
	     endpoint.
	- \c B_BUTT_CAP A straight edge is drawn without extending beyond the endpoint.
	- \c B_SQUARE_CAP A straight edge is drawn extending past the endpoint by half
	     the line width.
	\param lineJoin One of the following:
	- \c B_ROUND_JOIN Same as \c B_ROUND_CAP but for a join.
	- \c B_MITER_JOIN The lines are extended until they meet. If angle that they
	     meet at is greater than the 2*arcsin(1/\a miterLimit) than a bevel join
		 is used instead.
	- \c B_BEVEL_JOIN The area between the caps is filled with a triangle.
	- \c B_BUTT_JOIN Same as \c B_BUTT_CAP but for a join.
	- \c B_SQUARE_JOIN Same as \c B_SQUARE_CAP but for a join.
	\param miterLimit Sets the cut off angle before a miter join becomes a bevel
	       join calculated by 2*arcsin(1/\a miterLimit).
*/


/*!
	\fn join_mode BView::LineJoinMode() const
	\brief Returns the current line join mode.

	\return The current line join mode set to the view.
*/


/*!
	\fn cap_mode BView::LineCapMode() const
	\brief Returns the current line cap mode.

	\return The current line cap mode set to the view.
*/


/*!
	\fn float BView::LineMiterLimit() const
	\brief Returns the miter limit used for \c B_MITER_JOIN join mode.

	\return The current miter limit set to the view.
*/


/*!
	\fn void BView::SetDrawingMode(drawing_mode mode)
	\brief Sets the drawing mode of the view.

	The default drawing mode is \c B_OP_COPY.

	\param mode Set to one of the following:
	- \c B_OP_COPY
	- \c B_OP_OVER
	- \c B_OP_ERASE
	- \c B_OP_INVERT
	- \c B_OP_SELECT
	- \c B_OP_ALPHA
	- \c B_OP_MIN
	- \c B_OP_MAX
	- \c B_OP_ADD
	- \c B_OP_SUBTRACT
	- \c B_OP_BLEND
*/


/*!
	\fn drawing_mode BView::DrawingMode() const
	\brief Return the current drawing_mode.

	\return The current drawing_mode.
*/


/*!
	\fn void BView::SetBlendingMode(source_alpha srcAlpha,
		alpha_function alphaFunc)
	\brief Set the blending mode which controls how transparency is used.

	\param srcAlpha Set to one of the following:
	- \c B_CONSTANT_ALPHA Use the high color's alpha channel.
	- \c B_PIXEL_ALPHA Use the alpha value of each pixel when drawing a bitmap.
	\param alphaFunc Set to one of the following:
	- \c B_ALPHA_OVERLAY Used for drawing a image with transparency over an opaque
	     background.
	- \c B_ALPHA_COMPOSITE Used to composite two or more transparent images
	     together offscreen to produce a new image drawn using
		 \c B_ALPHA_OVERLAY mode.
*/


/*!
	\fn void BView::GetBlendingMode(source_alpha* srcAlpha,
		alpha_function* alphaFunc) const
	\brief Fill out \a srcAlpha and \a alphaFunc with the alpha mode and
	       alpha function of the view.

	\param[out] srcAlpha The alpha mode to fill out.
	\param[out] alphaFunc The alpha function to fill out.
*/


/*!
	\fn void BView::MovePenTo(BPoint point)
	\brief Move the pen to \a point in the view's coordinate system.

	\param point the location to move the pen to.
*/


/*!
	\fn void BView::MovePenTo(float x, float y)
	\brief Move the pen to the point specified by \a x and \a y in the view's
	       coordinate system.

	\param x The horizontal coordinate to move the pen to.
	\param y The vertical coordinate to move the pen to.
*/


/*!
	\fn void BView::MovePenBy(float x, float y)
	\brief Move the pen by \a x pixels horizontally and \a y pixels vertically.

	\param x The number of pixels to move the pen horizontally.
	\param y The number of pixels to move the pen vertically.
*/


/*!
	\fn BPoint BView::PenLocation() const
	\brief Return the current pen location as a BPoint object.

	\return The current pen location in the view's coordinate system.
*/


/*!
	\fn void BView::SetPenSize(float size)
	\brief Set the pen size to \a size.

	\param size The pen size to set.
*/


/*!
	\fn float BView::PenSize() const
	\brief Return the current pen size.

	\return The current pen size as a float.
*/


/*!
	\fn void BView::SetHighColor(rgb_color color)
	\brief Set the high color of the view.

	\param color The color to set.
*/


/*!
	\fn void BView::SetHighColor(uchar red, uchar green, uchar blue,
		uchar alpha)
	\brief Set the high color of the view.

	\param red The \a red component of the high color.
	\param green The \a green component of the high color.
	\param blue The \a blue component of the high color.
	\param alpha The \a alpha component of the high color.
*/


/*!
	\fn rgb_color BView::HighColor() const
	\brief Return the current high color.

	\return The current high color as an rgb_color struct.
*/


/*!
	\fn void BView::SetLowColor(rgb_color color)
	\brief Set the low color of the view.

	\param color The color to set.
*/


/*!
	\fn void BView::SetLowColor(uchar red, uchar green, uchar blue, uchar alpha)
	\brief Set the low color of the view.

	\param red The \a red component of the low color.
	\param green The \a green component of the low color.
	\param blue The \a blue component of the low color.
	\param alpha The \a alpha component of the low color.
*/


/*!
	\fn rgb_color BView::LowColor() const
	\brief Return the current low color.

	\return The current low color as an rgb_color struct.
*/


/*!
	\fn void BView::SetViewColor(rgb_color color)
	\brief Set the view color of the view.

	\param color The color to set.
*/


/*!
	\fn void BView::SetViewColor(uchar red, uchar green, uchar blue,
		uchar alpha)
	\brief Set the view color of the view.

	\param red The \a red component of the view color.
	\param green The \a green component of the view color.
	\param blue The \a blue component of the view color.
	\param alpha The \a alpha component of the view color.
*/


/*!
	\fn rgb_color BView::ViewColor() const
	\brief Return the current view color.

	\return The current view color as an rgb_color struct.
*/


/*!
	\fn void BView::ForceFontAliasing(bool enable)
	\brief Turn anti-aliasing on and off when printing.

	Typically want to turn font anti-aliasing off when printing by passing
	\c true to this method and then turn it on again by passing in \c false.

	This method does not affect characters drawn to the screen.

	\param enable If \c true turn off anti-aliasing, if \c false turn on
	       anti-aliasing.
*/


/*!
	\fn void BView::SetFont(const BFont* font, uint32 mask)
	\brief Set the font of the view.

	By passing \c B_FONT_ALL to the \a mask parameter as is the default all font
	properties from \a font are set on the view.

	\param font A pointer to a BFont object to set.
	\param mask A mask of the following values to determine what font properties to set:
	- \c B_FONT_FAMILY_AND_STYLE
	- \c B_FONT_SPACING
	- \c B_FONT_SIZE
	- \c B_FONT_ENCODING
	- \c B_FONT_SHEAR
	- \c B_FONT_FACE
	- \c B_FONT_ROTATION
	- \c B_FONT_FLAGS
*/


/*!
	\fn void BView::GetFont(BFont* font) const
	\brief Fill out \a font with the font set to the view.

	\param[out] font The BFont object to fill out.
*/


/*!
	\fn void BView::GetFontHeight(font_height* height) const
	\brief Fill out the font_height struct with the view font.

	\param[out] height The font_height struct to fill out.
*/


/*!
	\fn void BView::SetFontSize(float size)
	\brief Set the size of the view's font to \a size.

	\param size The font size to set to the view in points.
*/


/*!
	\fn float BView::StringWidth(const char* string) const
	\brief Return the width of \a string set in the font of the view.

	\param string The \a string to get the width of.

	\return The width of the string in the view's font as a float.
*/


/*!
	\fn float BView::StringWidth(const char* string, int32 length) const
	\brief Return the width of \a string set in the font of the view up to
	       \a length characters.

	\param string The \a string to get the width of.
	\param length The maximum number of characters in \a string to consider.

	\return The width of the string in the view's font as a float.
*/


/*!
	\fn void BView::GetStringWidths(char* stringArray[], int32 lengthArray[],
		int32 numStrings, float widthArray[]) const
	\brief Fill out widths of the strings in \a stringArray set in the font
	       of the view into \a widthArray.

	\param stringArray The array of strings to get the lengths of.
	\param lengthArray The number of characters of the strings in \a stringArray
	       to consider.
	\param numStrings The number of strings in \a stringArray.
	\param widthArray The array to store the widths of the strings in
	       \a stringArray.
*/


/*!
	\fn void BView::TruncateString(BString* string, uint32 mode, float width) const
	\brief Truncate \a string with truncation mode \a mode so that it is no wider
	       than \a width set in the view's font.

	When the string is truncated the missing characters are replaced by a
	horizontal ellipses.

	\param string The string to truncate in place.
	\param mode The truncation mode to use, one of the following:
	- \c B_TRUNCATE_BEGINNING Truncate from the beginning of the string.
	- \c B_TRUNCATE_MIDDLE Truncate from the middle of the string.
	- \c B_TRUNCATE_END Truncate from the end of the string.
	- \c B_TRUNCATE_SMART Truncate from anywhere based on the string content.
	     Not currently implemented.
	\param width The maximum width to truncate the string to.
*/


/*!
	\fn void BView::ClipToPicture(BPicture* picture, BPoint where, bool sync)
	\brief Intersects the current clipping region of the view with the pixels
	       of \a picture.

	BPicture instances are resolution independent, \a picture is effectively
	drawn at the view's resolution and the bitmap produced is used to modify the
	clipping region.

	The pixels that are at least partially opaque are the ones drawn by
	\a picture.

	\param picture The BPicture object to intersect with.
	\param where Offset in the view's coordinate system.
	\param sync If \c false, this method will execute asynchronously.
*/


/*!
	\fn void BView::ClipToInversePicture(BPicture* picture, BPoint where,
		bool sync)
	\brief Intersects the current clipping region of the view with the pixels
	       outside of \a picture.

	\param picture The BPicture object to intersect with.
	\param where Offset in the view's coordinate system.
	\param sync If \c false, this method will execute asynchronously.

	\see ClipToPicture()
*/


/*!
	\fn void BView::GetClippingRegion(BRegion* region) const
	\brief Fill out \a region with the view's clipping region.

	\param[out] region The BRegion object to fill out.
*/


/*!
	\fn void BView::ConstrainClippingRegion(BRegion* region)
	\brief Set the clipping region the \a region restricting the area that the
	       view can draw in.

	The Application Server keeps track of the clipping region for each view
	attached to a window so that the view can't draw outside of it,
	consequently this method works only for view that are attached to a window.

	The default clipping region contains the visible area of the view. By passing
	a region to this method the clipping area is further restricted. Passing in
	\c NULL resets the clipping region back to the default.

	Calls to ConstrainClippingRegion() are not cumulative, each time this
	method is called it replaces the old clipping region.

	\param region The region to set the clipping region to or \c NULL
	       to reset to default.
*/


//! @}


/*!
	\name Drawing Related Methods

	The view must be attached to the window for these methods to work unless
	otherwise stated. Notes on specific methods are provided below:

	DrawBitmap()

	If the the image is bigger than the destination rectangle, it is scaled to fit.

	The asynchronous versions pass the image to Application Server and return
	immediately.

	This can be more efficient in some cases for example to draw several bitmaps
	at once and then call Sync() to tell Application Server to wait for them all
	to finish drawing rather than waiting for each one to draw.

	DrawPicture()

	The asynchronous versions pass the picture to Application Server and return
	immediately.

	This can be more efficient in some cases for example to draw several pictures
	at once and then call Sync() to tell Application Server to wait for them all
	to finish drawing rather than waiting for each one to draw.

	DrawPicture() doesn't alter the graphics state of the view nor do changes to
	the graphics state of the view alter the BPicture object. What the picture
	will look like depends on the graphics parameters that were in effect when the
	picture was recorded.

	DrawString()

	The \a string is drawn in the view's current font and is modified by
	the other parameters of the font such as it's direction (left-to-right or
	right-to-left), rotation, spacing, shear, etc. The \a string is always drawn
	left to right even if it's text direction is set to right-to-left mode.

	Drawing a string is fastest in \c B_OP_COPY mode and anti-aliasing can
	produce undesirable effects when a string is draw in other modes, especially
	if the string is drawn in the same location repeatedly.

	DrawString() doesn't erase before drawing.
*/


//! @{


/*!
	\fn void BView::DrawBitmapAsync(const BBitmap* bitmap, BRect bitmapRect,
		BRect viewRect, uint32 options)
	\brief Draws \a bitmap on the view within \a viewRect asynchronously.

	\param bitmap The bitmap to draw onto the view.
	\param bitmapRect The portion of the bitmap to draw in the bitmap's
	       coordinate system.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
	\param options ??
*/


/*!
	\fn void BView::DrawBitmapAsync(const BBitmap* bitmap, BRect bitmapRect,
		BRect viewRect)
	\brief Draws \a bitmap on the view within \a viewRect asynchronously.

	\param bitmap The bitmap to draw onto the view.
	\param bitmapRect The portion of the bitmap to draw in the bitmap's
	       coordinate system.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
*/


/*!
	\fn void BView::DrawBitmapAsync(const BBitmap* bitmap, BRect viewRect)
	\brief Draws \a bitmap on the view within \a viewRect asynchronously.

	\param bitmap The bitmap to draw onto the view.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
*/


/*!
	\fn void BView::DrawBitmapAsync(const BBitmap* bitmap, BPoint where)
	\brief Draws \a bitmap on the view offset by \a where asynchronously.

	\param bitmap The bitmap to draw onto the view.
	\param where The location to draw the bitmap in the view's coordinate system.
*/


/*!
	\fn void BView::DrawBitmapAsync(const BBitmap* bitmap)
	\brief Draws \a bitmap on the view asynchronously.

	\param bitmap The bitmap to draw onto the view.
*/


/*!
	\fn void BView::DrawBitmap(const BBitmap* bitmap, BRect bitmapRect,
		BRect viewRect, uint32 options)
	\brief brief Draws \a bitmap on the view within \a viewRect.

	\param bitmap The bitmap to draw onto the view.
	\param bitmapRect The portion of the bitmap to draw in the bitmap's
	       coordinate system.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
	\param options ??
*/


/*!
	\fn void BView::DrawBitmap(const BBitmap* bitmap, BRect bitmapRect,
		BRect viewRect)
	\brief Draws \a bitmap on the view within \a viewRect.

	\param bitmap The bitmap to draw onto the view.
	\param bitmapRect The portion of the bitmap to draw in the bitmap's
	       coordinate system.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
*/


/*!
	\fn void BView::DrawBitmap(const BBitmap* bitmap, BRect viewRect)
	\brief Draws \a bitmap on the view within \a viewRect.

	\param bitmap The bitmap to draw onto the view.
	\param viewRect The area in the view's coordinate system to draw the
	       bitmap in.
*/


/*!
	\fn void BView::DrawBitmap(const BBitmap* bitmap, BPoint where)
	\brief Draws \a bitmap on the view offset by \a where.

	\param bitmap The bitmap to draw onto the view.
	\param where The location to draw the bitmap in the view's coordinate system.
*/


/*!
	\fn void BView::DrawBitmap(const BBitmap* bitmap)
	\brief Draws \a bitmap on the view.

	\param bitmap The bitmap to draw onto the view.
*/


/*!
	\fn void BView::DrawChar(char c)
	\brief Draws character \a c onto to the view at the current pen position.

	The character is drawn in the view's current font.

	\param c The character to draw.
*/


/*!
	\fn void BView::DrawChar(char c, BPoint location)
	\brief Draws character \a c at the specified \a location in the view.

	The character is drawn in the view's current font.

	\param c The character to draw.
	\param location The location in the view to draw the character.
*/


/*!
	\fn void BView::DrawString(const char* string, escapement_delta* delta)
	\brief Draw \a string onto the view at the current pen position.

	\param string The string to draw.
	\param delta Adds additional width to each character according to the
	       following fields:
	- nonspace(float) The amount of width to add to characters with visible
	  glyphs.
	- space(float) The amount of width to add to characters with escapements
	  but don't have visible glyphs.
*/


/*!
	\fn void BView::DrawString(const char* string, BPoint location,
		escapement_delta* delta)
	\brief Draw \a string onto the view at the specified \a location in the view.

	\param string The string to draw.
	\param location The location in the view to draw the string.
	\param delta Adds additional width to each character according to the
	       following fields:
	- nonspace(float) The amount of width to add to characters with visible
	  glyphs.
	- space(float) The amount of width to add to characters with escapements
	  but don't have visible glyphs.
*/


/*!
	\fn void BView::DrawString(const char* string, int32 length,
		escapement_delta* delta)
	\brief Draw \a string up to \a length characters onto the view at the current
	       pen position.

	\param string The string to draw.
	\param length The maximum number of characters in \a string to draw.
	\param delta Adds additional width to each character according to the
	       following fields:
	- nonspace(float) The amount of width to add to characters with visible
	  glyphs.
	- space(float) The amount of width to add to characters with escapements
	  but don't have visible glyphs.
*/


/*!
	\fn void BView::DrawString(const char* string, int32 length, BPoint location,
		escapement_delta* delta)
	\brief Draw \a string up to \a length characters onto the view at the
	       specified \a location in the view.

	\param string The string to draw.
	\param length The maximum number of characters in \a string to draw.
	\param location The location in the view to draw the string.
	\param delta Adds additional width to each character according to the
	       following fields:
	- nonspace(float) The amount of width to add to characters with visible
	  glyphs.
	- space(float) The amount of width to add to characters with escapements
	  but don't have visible glyphs.
*/


/*!
	\fn void BView::DrawString(const char* string, const BPoint* locations,
		int32 locationCount)
	\brief Draw \a string \a locationCount times at the specified \a locations.

	\param string The string to draw.
	\param locations A pointer to an array of BPoint objects to draw the string.
	\param locationCount The number of elements in \a locations.
*/


/*!
	\fn void BView::DrawString(const char* string, int32 length,
		const BPoint* locations, int32 locationCount)
	\brief Draw \a string up to \a length characters \a locationCount times at the
	       specified \a locations.

	\param string The string to draw.
	\param length The maximum number of characters in \a string to draw.
	\param locations A pointer to an array of BPoint objects to draw the string.
	\param locationCount The number of elements in \a locations.
*/


/*!
	\fn void BView::StrokeEllipse(BPoint center, float xRadius, float yRadius,
		::pattern pattern)
	\brief Stroke the outline of an ellipse starting at \a center with a
	       horizontal radius of \a xRadius and a vertical radius of \a yRadius.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokeEllipse(BRect rect, ::pattern pattern)
	\brief Stroke the outline of an ellipse inscribed within \a rect.

	\param rect The area within which to inscribe the shape.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillEllipse(BPoint center, float xRadius, float yRadius,
		::pattern pattern)
	\brief Fill an ellipse starting at \a center with a horizontal radius
	       of \a xRadius and a vertical radius of \a yRadius.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillEllipse(BRect rect, ::pattern pattern)
	\brief Fill an ellipse inscribed within \a rect.

	\param rect The area within which to inscribe the shape.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillEllipse(BPoint center, float xRadius, float yRadius,
		const BGradient& gradient)
	\brief Fill an ellipse with the specified \a gradient pattern starting at
	       \a center with a horizontal radius of \a xRadius and a vertical radius
		   of \a yRadius.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param gradient The gradient pattern to fill the ellipse with.
*/


/*!
	\fn void BView::FillEllipse(BRect rect, const BGradient& gradient)
	\brief Fill an ellipse with the specified \a gradient pattern inscribed within
	       \a rect.

	\param rect The area within which to inscribe the shape.
	\param gradient The gradient pattern to fill the ellipse with.
*/


/*!
	\fn void BView::StrokeArc(BPoint center, float xRadius, float yRadius,
		float startAngle, float arcAngle, ::pattern pattern)
	\brief Stroke the outline of an arc starting at \a center with a
	       horizontal radius of \a xRadius and a vertical radius of \a yRadius
	       starting at \a startAngle and drawing \a arcAngle degrees.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokeArc(BRect rect, float startAngle, float arcAngle,
		::pattern pattern)
	\brief Stroke the outline of an arc inscribed within \a rect starting at
	       \a startAngle and drawing \a arcAngle degrees.

	\param rect The area within which to inscribe the shape.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillArc(BPoint center, float xRadius, float yRadius,
		float startAngle, float arcAngle, ::pattern pattern)
	\brief Fill an arc starting at \a center with a horizontal radius of
	       \a xRadius and a vertical radius of \a yRadius starting at
	       \a startAngle and drawing \a arcAngle degrees.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillArc(BPoint center, float xRadius, float yRadius,
		float startAngle, float arcAngle, const BGradient& gradient)
	\brief Fill an arc with the specified \a gradient pattern starting at
	       \a center with a horizontal radius of \a xRadius and a vertical
		   radius of \a yRadius starting at \a startAngle and drawing
		   \a arcAngle degrees.

	\param center The center point.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param gradient The gradient pattern to fill the arc with.
*/


/*!
	\fn void BView::FillArc(BRect rect, float startAngle, float arcAngle,
		::pattern pattern)
	\brief Fill an arc inscribed within \a rect starting at startAngle and
	       drawing \a arcAngle degrees.

	\param rect The area within which to inscribe the shape.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillArc(BRect rect, float startAngle, float arcAngle,
		const BGradient& gradient)
	\brief Fill an arc with the specified \a gradient pattern inscribed within
	       \a rect starting at startAngle and drawing \a arcAngle degrees.

	\param rect The area within which to inscribe the shape.
	\param startAngle The angle to begin drawing at.
	\param arcAngle The number of degrees of the arc to draw.
	\param gradient The gradient pattern to fill the arc with.
*/


/*!
	\fn void BView::StrokeBezier(BPoint* controlPoints, ::pattern pattern)
	\brief Stroke a bezier curve.

	\param controlPoints The list of points that form the bezier curve.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillBezier(BPoint* controlPoints, ::pattern pattern)
	\brief Fill a bezier curve.

	\param controlPoints The list of points that form the bezier curve.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillBezier(BPoint* controlPoints, const BGradient& gradient)

	\brief Fill a bezier curve.

	\param controlPoints The list of points that form the bezier curve.
	\param gradient The gradient pattern to fill the bezier curve with.
*/


/*!
	\fn void BView::StrokePolygon(const BPolygon* polygon, bool closed, ::pattern pattern)
	\brief Stroke a polygon shape.

	\param polygon The polygon shape to stroke.
	\param closed Whether or not the last line of the polygon should intersect
	       with the initial point.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokePolygon(const BPoint* pointArray, int32 numPoints,
		bool closed, ::pattern pattern)
	\brief Stroke a polygon shape made up of points specified by \a pointArray.

	\param pointArray An array of points that specify the vertices of the polygon.
	\param numPoints The number of points in \a pointArray.
	\param closed Whether or not the last line of the polygon should intersect
	       with the initial point.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokePolygon(const BPoint* pointArray, int32 numPoints,
		BRect bounds, bool closed, ::pattern pattern)
	\brief Stroke a polygon shape made up of points specified by \a pointArray
	       inscribed by \a bounds.

	\param pointArray An array of points that specify the vertices of the polygon.
	\param numPoints The number of points in \a pointArray.
	\param bounds The smallest rectangle that encloses the points in \a pointArray.
	\param closed Whether or not the last line of the polygon should intersect
	       with the initial point.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillPolygon(const BPolygon* polygon, ::pattern pattern)
	\brief Fill a polygon shape.

	\param polygon The polygon shape to fill.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillPolygon(const BPolygon* polygon,
		const BGradient& gradient)
	\brief Fill a polygon shape with the specified \a gradient pattern.

	\param polygon The polygon shape to fill.
	\param gradient The gradient pattern to fill the polygon with.
*/


/*!
	\fn void BView::FillPolygon(const BPoint* pointArray, int32 numPoints,
		::pattern pattern)
	\brief Fill a polygon shape made up of points specified by \a pointArray.

	\param pointArray An array of points that specify the vertices of the polygon.
	\param numPoints The number of points in \a pointArray.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillPolygon(const BPoint* pointArray, int32 numPoints,
		const BGradient& gradient)
	\brief Fill a polygon shape made up of points specified by \a pointArray
	       with the specified \a gradient pattern.

	\param pointArray An array of points that specify the vertices of the
	       polygon.
	\param numPoints The number of points in \a pointArray.
	\param gradient The gradient pattern to fill the polygon with.
*/


/*!
	\fn void BView::FillPolygon(const BPoint* pointArray, int32 numPoints,
		BRect bounds, ::pattern pattern)
	\brief Fill a polygon shape made up of points specified by \a pointArray
	       inscribed by \a bounds.

	\param pointArray An array of points that specify the vertices of the
	       polygon.
	\param numPoints The number of points in \a pointArray.
	\param bounds The smallest rectangle that encloses the points in
	       \a pointArray.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillPolygon(const BPoint* pointArray, int32 numPoints,
		BRect bounds, const BGradient& gradient)
	\brief Fill a polygon shape made up of points specified by \a pointArray
	       inscribed by \a bounds with the specified \a gradient pattern.

	\param pointArray An array of points that specify the vertices of the
	       polygon.
	\param numPoints The number of points in \a pointArray.
	\param bounds The smallest rectangle that encloses the points in
	       \a pointArray.
	\param gradient The gradient pattern to fill the polygon with.
*/


/*!
	\fn void BView::StrokeRect(BRect rect, ::pattern pattern)
	\brief Stroke the rectangle specified by \a rect.

	\param rect The rectangular area to stroke.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillRect(BRect rect, ::pattern pattern)
	\brief Fill the rectangle specified by \a rect.

	\param rect The rectangular area to fill.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillRect(BRect rect, const BGradient& gradient)
	\brief Fill the rectangle specified by \a rect with the specified
	       \a gradient pattern.

	\param rect The rectangular area to fill.
	\param gradient The gradient pattern to fill the rectangle with.
*/


/*!
	\fn void BView::StrokeRoundRect(BRect rect, float xRadius, float yRadius,
		::pattern pattern)
	\brief Stroke the rounded rectangle with horizontal radius \a xRadius and
	       vertical radius \a yRadius.

	\param rect The rectangular area to stroke the round rect within.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillRoundRect(BRect rect, float xRadius, float yRadius,
		::pattern pattern)
	\brief Fill the rounded rectangle with horizontal radius \a xRadius and
	       vertical radius \a yRadius.

	\param rect The rectangular area to fill the round rect within.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillRoundRect(BRect rect, float xRadius, float yRadius,
		const BGradient& gradient)
	\brief Fill the rounded rectangle with horizontal radius \a xRadius and
	       vertical radius \a yRadius with the specified \a gradient pattern.

	\param rect The rectangular area to fill the round rect within.
	\param xRadius The horizontal radius.
	\param yRadius The vertical radius.
	\param gradient The gradient pattern to fill the round rect with.
*/


/*!
	\fn void BView::FillRegion(BRegion* region, ::pattern pattern)
	\brief Fill \a region.

	\param region The \a region to fill.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillRegion(BRegion* region, const BGradient& gradient)
	\brief Fill \a region with the specified \a gradient pattern.

	\param region The \a region to fill.
	\param gradient The gradient pattern to fill the \a region with.
*/


/*!
	\fn void BView::StrokeTriangle(BPoint point1, BPoint point2, BPoint point3,
		BRect bounds, ::pattern pattern)
	\brief Stroke the triangle specified by points \a point1, \a point2, and
	       \a point3 and enclosed by \a bounds.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param bounds The rectangular area that encloses the triangle.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokeTriangle(BPoint point1, BPoint point2, BPoint point3,
		::pattern pattern)
	\brief Stroke the triangle specified by points \a point1, \a point2,
	       and \a point3.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillTriangle(BPoint point1, BPoint point2, BPoint point3,
		::pattern pattern)
	\brief Fill the triangle specified by points \a point1, \a point2,
	       and \a point3.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillTriangle(BPoint point1, BPoint point2, BPoint point3,
		const BGradient& gradient)
	\brief Fill the triangle specified by points \a point1, \a point2,
	       and \a point3 with the specified \a gradient pattern.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param gradient The gradient pattern to fill the triangle with.
*/


/*!
	\fn void BView::FillTriangle(BPoint point1, BPoint point2, BPoint point3,
		BRect bounds, ::pattern pattern)
	\brief Fill the triangle specified by points \a point1, \a point2,
	       and \a point3 and enclosed by \a bounds.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param bounds The rectangular area that encloses the triangle.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillTriangle(BPoint point1, BPoint point2, BPoint point3,
		BRect bounds, const BGradient& gradient)
	\brief Fill the triangle specified by points \a point1, \a point2,
	       and \a point3 and enclosed by \a bounds with the specified
	       \a gradient pattern.

	\param point1 The first point of the triangle.
	\param point2 The second point of the triangle.
	\param point3 The third point of the triangle.
	\param bounds The rectangular area that encloses the triangle.
	\param gradient The gradient pattern to fill the triangle with.
*/


/*!
	\fn void BView::StrokeLine(BPoint toPoint, ::pattern pattern)
	\brief Stroke a line from the current pen location to the point \a toPoint.

	\param toPoint The end point of the line.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokeLine(BPoint start, BPoint end, ::pattern pattern)
	\brief Stroke a line from point \a start to point \a end.

	\param start The start point of the line.
	\param end The end point of the line.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::StrokeShape(BShape* shape, ::pattern pattern)
	\brief Stroke \a shape.

	\param shape The \a shape to stroke.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillShape(BShape* shape, ::pattern pattern)
	\brief Fill \a shape.

	\param shape The \a shape to fill.
	\param pattern One of the following:
	- \c B_SOLID_HIGH
	- \c B_SOLID_LOW
	- \c B_MIXED_COLORS
*/


/*!
	\fn void BView::FillShape(BShape* shape, const BGradient& gradient)
	\brief Fill \a shape with the specified \a gradient pattern.

	\param shape The \a shape to fill.
	\param gradient The gradient pattern to fill the \a shape with.
*/


/*!
	\fn void BView::BeginLineArray(int32 count)
	\brief Begin a line array of up to \a count lines.

	This is a more efficient way of drawing a large number of lines than calling
	StrokeLine() repeatedly. First call BeginLineArray() to begin drawing lines,
	then call AddLine() for each line you wish to draw, and finally call
	EndLineArray() to finish the line array and draw the lines.

	These methods don't move the current pen location or change the high or low
	colors of the view. \a count should be close to the number of lines you wish
	to draw and should be below 256 to draw efficiently.

	\param count The maximum number of lines in the line array to draw.

	\see StrokeLine()
*/


/*!
	\fn void BView::AddLine(BPoint start, BPoint end, rgb_color color);
	\brief Add a line to the line array from point \a pt0 to point \a pt1.

	\param start The \a start point of the line.
	\param end The \a end point of the line.
	\param color The line \a color.
*/


/*!
	\fn void BView::EndLineArray()
	\brief End the line array drawing the lines.
*/


/*!
	\fn void BView::SetDiskMode(char* filename, long offset)
	\brief Unimplemented.
*/


/*!
	\fn void BView::BeginPicture(BPicture* picture)
	\brief Begins sending drawing instructions to \a picture.

	The \a BPicture object is cleared and any successive drawing instructions sent
	to the view are redirected to \a picture until EndPicture() is called. To
	append drawing instructions to a BPicture object without clearing it first
	call AppendToPicture() instead.

	The view doesn't display anything to the screen while it's recording to \a
	picture. Use the DrawPicture() method to render the \a picture.

	Only drawing instructions performed directly on the view, not it's child views
	are send to the BPicture object and BPicture captures only primitive graphics
	operations. The view must be attached to a window for the drawing instruction
	to be recorded. Drawing instructions are recorded even if the view is hidden or
	resides outside the clipping region or the window is off-screen.

	\param picture The BPicture object to record drawing instructions to.
*/


/*!
	\fn void BView::AppendToPicture(BPicture* picture)
	\brief Appends drawing instructions to \a picture without clearing it first.

	\param picture The BPicture object to record drawing instructions to.
*/


/*!
	\fn BPicture* BView::EndPicture()
	\brief Ends the drawing instruction recording session and returns the
	       BPicture object passed to BeginPicture() or AppendToPicture().

	\return The BPicture object passed to BeginPicture() or AppendToPicture().
*/


/*!
	\fn void BView::SetViewBitmap(const BBitmap* bitmap, BRect srcRect,
		BRect dstRect, uint32 followFlags, uint32 options)
	\brief Sets the background \a bitmap of the view.

	All drawing to the view occurs over \a bitmap. Any visible regions not
	covered by \a bitmap are filled with the current background color.

	Once \a bitmap has been passed in and this method returns the caller may
	safely delete the object.

	\param bitmap The background bitmap to set to the view.
	\param srcRect Specifies the area of \a bitmap to use.
	\param dstRect Specifies the area of the view to set \a bitmap to.
	\param followFlags Specifies the as the view is resized. See the BView
	       constructor for more details.
	\param options Specifies additional view options. The only option currently
	       available is \c B_TILE_BITMAP which tiles the bitmap across the view.
*/


/*!
	\fn void BView::SetViewBitmap(const BBitmap* bitmap, uint32 followFlags,
		uint32 options)
	\brief Sets the background \a bitmap of the view.

	All drawing to the view occurs over \a bitmap. Any visible regions not
	covered by \a bitmap are filled with the current background color.

	Once \a bitmap has been passed in and this method returns the caller may
	safely delete the object.

	\param bitmap The background bitmap to set to the view.
	\param followFlags Specifies the as the view is resized. See the BView
	       constructor for more details.
	\param options Specifies additional view options. The only option currently
	       available is \c B_TILE_BITMAP which tiles the bitmap across the view.
*/


/*!
	\fn void BView::ClearViewBitmap()
	\brief Clears the background bitmap of the view if it has one.
*/


/*!
	\fn status_t BView::SetViewOverlay(const BBitmap* overlay, BRect srcRect,
		BRect dstRect, rgb_color* colorKey, uint32 followFlags, uint32 options)
	\brief Sets the \a overlay bitmap of the view.

	\a colorKey specifies which color pixels in \a overlay are treated as transparent
	allowing the pixels of the view to show through.

	Once \a overlay has been passed in and this method returns the caller may
	safely delete the object.

	\param overlay The overlay bitmap to set to the view.
	\param srcRect Specifies the area of \a overlay to use.
	\param dstRect Specifies the area of the view to set \a overlay to.
	\param colorKey The color in \a overlay to treat as transparent.
	\param followFlags Specifies the as the view is resized. See the BView
	       constructor for more details.
	\param options Specifies additional view options. The only option currently
	       available is \c B_TILE_BITMAP which tiles the bitmap across the view.
*/


/*!
	\fn status_t BView::SetViewOverlay(const BBitmap* overlay,
		rgb_color* colorKey, uint32 followFlags, uint32 options)
	\brief Sets the \a overlay bitmap of the view.

	\a colorKey specifies which color pixels in \a overlay are treated as transparent
	allowing the pixels of the view to show through.

	Once \a overlay has been passed in and this method returns the caller may
	safely delete the object.

	\param overlay The overlay bitmap to set to the view.
	\param colorKey The color in \a overlay to treat as transparent.
	\param followFlags Specifies the as the view is resized. See the BView
	       constructor for more details.
	\param options Specifies additional view options. The only option currently
	       available is \c B_TILE_BITMAP which tiles the bitmap across the view.
*/


/*!
	\fn void BView::ClearViewOverlay()
	\brief Clears the overlay bitmap of the view if it has one.
*/


/*!
	\fn void BView::CopyBits(BRect src, BRect dst)
	\brief Copy the bits from the \a src rectangle to the \a dst rectangle in the
	       view's coordinate system.

	If the rectangles are of different sizes than \a src is scaled to fit. \a src
	is clipped if a part of \a dst lies outside of the visible region of the view.
	Only the visible portions of \a src are copied.

	The view must be attached to a window for this method to work.

	\param src The source rectangle to copy bits from.
	\param dst The destination rectangle to copy bits to.
*/


/*!
	\fn void BView::DrawPicture(const BPicture* picture)
	\brief Draws the \a picture at the view's current pen position.

	\param picture The BPicture object to draw.
*/


/*!
	\fn void BView::DrawPicture(const BPicture* picture, BPoint where)
	\brief Draws the \a picture at the location in the view specified by \a where.

	\param picture The BPicture object to draw.
	\param where The point on the view to draw \a picture.
*/


/*!
	\fn void BView::DrawPicture(const char* filename, long offset, BPoint where)
	\brief Draws the \a picture from the file specified by \a filename offset by
	       \a offset bytes at the location in the view specified by \a where.

	\param filename The filename of the file containing the picture to draw.
	\param where The point on the view to draw the picture.
	\param offset The number of bytes to offset in the file to find the picture.
*/


/*!
	\fn void BView::DrawPictureAsync(const BPicture* picture)
	\brief Draws the \a picture at the view's current pen position.

	\param picture The BPicture object to draw.
*/


/*!
	\fn void BView::DrawPictureAsync(const BPicture* picture, BPoint where)
	\brief Draws the \a picture at the location in the view specified by \a where.

	\param picture The BPicture object to draw.
	\param where The point on the view to draw \a picture.
*/


/*!
	\fn void BView::DrawPictureAsync(const char* filename, long offset, BPoint where)
	\brief Draws the \a picture from the file specified by \a filename offset by
	       \a offset bytes at the location in the view specified by \a where.

	\param filename The filename of the file containing the picture to draw.
	\param where The point on the view to draw the picture.
	\param offset The number of bytes to offset in the file to find the picture.
*/


/*!
	\fn void BView::Invalidate(BRect invalRect)
	\brief Sends a message to App Server to redraw the portion of the view
	       specified by \a invalRect.

	\param invalRect The rectangular area of the view to redraw.
*/


/*!
	\fn void BView::Invalidate(const BRegion* region)
	\brief Sends a message to App Server to redraw the portion of the view
	       specified by \a region.

	\param region The region of the view to redraw.
*/


/*!
	\fn void BView::Invalidate()
	\brief Sends a message to App Server to redraw the view.
*/


/*!
	\fn void BView::InvertRect(BRect rect)
	\brief Inverts the colors within \a rect.

	This method is often used to draw a highlighted selection in a view.

	\param rect The rectangular area in the view to invert the colors of.
*/


//! @}


/*!
	\name View Hierarchy Methods
*/


//! @{


/*!
	\fn void BView::AddChild(BView* child, BView* before)
	\brief Adds \a child to the view hierarchy immediately before \a before.

	A view may only have one parent at a time so \a child must not have already
	been added to the view hierarchy. if \a before \c NULL then \a child is added
	to the end of the tree. If the view is attached to a window \a child and all
	of its descendent views also become attached to the window invoking an
	AttachedToWindow() method on each view.

	\param child The child view to add.
	\param before The sibling view to add \a child before.
*/


/*!
	\fn bool BView::AddChild(BLayoutItem* child)
	\brief Add the \a child layout item to the view hierarchy.

	\param child The child layout item to add.
	\return Whether or not \a child was added to the view layout hierarchy.
*/


/*!
	\fn bool BView::RemoveChild(BView* child)
	\brief Removes \a child from the view hierarchy.

	\param child The child view to remove.
	\return Whether or not \a child was removed from the view hierarchy.
*/


/*!
	\fn int32 BView::CountChildren() const
	\brief Returns the number of child views that this view has.

	\return The number of child views.
*/


/*!
	\fn BView* BView::ChildAt(int32 index) const
	\brief Returns a pointer to the child view found at \a index.

	\param index The index of the child view to return a pointer of.

	\return A pointer to the child view at \a index or \c NULL if not found.
*/


/*!
	\fn BView* BView::NextSibling() const
	\brief Returns a pointer to the next sibling view.

	\return A pointer to the next sibling view or \a NULL if not found.
*/


/*!
	\fn BView* BView::PreviousSibling() const
	\brief Returns a pointer to the previous sibling view.

	\return A pointer to the previous sibling view or \a NULL if not found.
*/


/*!
	\fn bool BView::RemoveSelf()
	\brief Removes the view and all child views from the view hierarchy.

	\returns Whether or not the view was removed from the view hierarchy.
*/


/*!
	\fn BView* BView::Parent() const
	\brief Returns a pointer to the view's parent.

	\return A pointer to the parent view or \c NULL if not attached.
*/


/*!
	\fn BView* BView::FindView(const char* name) const
	\brief Returns the view in the view hierarchy with the specified \a name.

	\return The view in the view hierarchy with the specified \a name or \c NULL
	        if not found.
*/


//! @}


/*!
	\name View Frame Alteration Methods

	As a view's frame rectangle must be aligned to pixel values all parameters are
	rounded to the nearest integer. If the view isn't attached these methods alter the
	frame rectangle without triggering FrameMoved(), FrameResized() or Invalidate().
*/


//! @{


/*!
	\fn void BView::MoveBy(float deltaX, float deltaY)
	\brief Moves the view \a deltaX pixels horizontally and \a deltaY pixels
	       vertically in the parent view's coordinate system.

	\param deltaX The number of pixels to move the view horizontally.
	\param deltaY The number of pixels to move the view vertically.
*/


/*!
	\fn void BView::MoveTo(BPoint where)
	\brief Move the view to the location specified by \a where in the parent
	       view's coordinate system.

	\param where The location to move the view to.
*/


/*!
	\fn void BView::MoveTo(float x, float y)
	\brief Move the view to the coordinates specified by \a x in the horizontal
	       dimension and \a y in the vertical dimension in the parent view's
	       coordinate system.

	\param x The horizontal coordinate to move the view to.
	\param y The vertical coordinate to move the view to.
*/


/*!
	\fn void BView::ResizeBy(float deltaWidth, float deltaHeight)
	\brief Resize the view by \a deltaWidth horizontally and \a deltaHeight
	       vertically without moving the top left corner of the view.

	\param deltaWidth The number of pixels to resize the view by horizontally.
	\param deltaHeight The number of pixels to resize the view by vertically.
*/


/*!
	\fn void BView::ResizeTo(float width, float height)
	\brief Resize the view to the specified \a width and \a height.

	\param width The width to resize the view to.
	\param height The height to resize the view to.
*/


/*!
	\fn void BView::ResizeTo(BSize size)
	\brief Resize the view to the dimension specified by \a size.

	\param size The \a size to resize the view to.
*/


//! @}


/*!
	\fn status_t BView::GetSupportedSuites(BMessage* data)
	\brief Reports the suites of messages and specifiers understood by the view.

	\param data The message to use to report the suite of messages and specifiers.

	\see BHandler::GetSupportedSuites()
*/


/*!
	\fn BHandler* BView::ResolveSpecifier(BMessage* message, int32 index,
		BMessage* specifier, int32 what, const char* property)
	\brief Determine the proper handler for a scripting message.

	\see BHandler::ResolveSpecifier()
*/


/*!
	\fn status_t BView::Perform(perform_code code, void* _data)
	\brief Perform some action. (Internal Method)

	The following perform codes are recognized:
		- \c PERFORM_CODE_MIN_SIZE:
		- \c PERFORM_CODE_MAX_SIZE:
		- \c PERFORM_CODE_PREFERRED_SIZE:
		- \c PERFORM_CODE_LAYOUT_ALIGNMENT:
		- \c PERFORM_CODE_HAS_HEIGHT_FOR_WIDTH:
		- \c PERFORM_CODE_GET_HEIGHT_FOR_WIDTH:
		- \c PERFORM_CODE_SET_LAYOUT:
		- \c PERFORM_CODE_INVALIDATE_LAYOUT:
		- \c PERFORM_CODE_DO_LAYOUT:
		- \c PERFORM_CODE_GET_TOOL_TIP_AT:
		- \c PERFORM_CODE_ALL_UNARCHIVED:
		- \c PERFORM_CODE_ALL_ARCHIVED:

	\param code The perform code.
	\param _data A pointer to store some data.

	\returns A status code.

	\sa BHandler::Perform()
*/


/*!
	\name Layout Methods
*/


//! @{


/*!
	\fn BSize BView::MinSize()
	\brief Get the minimum size of the view.

	\return The minimum size of the view as a BSize.

	\sa BAbstractLayout::MinSize()
*/


/*!
	\fn BSize BView::MaxSize()
	\brief Get the maximum size of the view.

	\return The maximum size of the view as a BSize.

	\sa BAbstractLayout::MaxSize()
*/


/*!
	\fn BSize BView::PreferredSize()
	\brief Get the preferred size of the view.

	\return The preferred size of the view as a BSize.

	\sa BAbstractLayout::PreferredSize()
*/


/*!
	\fn void BView::SetExplicitMinSize(BSize size)
	\brief Set this item's explicit min size, to be used by MinSize().

	\sa BAbstractLayout::SetExplicitMinSize()
*/


/*!
	\fn void BView::SetExplicitMaxSize(BSize size)
	\brief Set this item's explicit max size, to be used by MaxSize().

	\sa BAbstractLayout::SetExplicitMaxSize()
*/


/*!
	\fn void BView::SetExplicitPreferredSize(BSize size)
	\brief Set this item's explicit preferred size, to be used by
		PreferredSize().

	\sa BAbstractLayout::SetExplicitPreferredSize()
*/


/*!
	\fn void BView::SetExplicitAlignment(BAlignment alignment)
	\brief Set this item's explicit alignment, to be used by Alignment().

	\sa BAbstractLayout::SetExplicitAlignment()
*/


/*!
	\fn void BView::SetLayout(BLayout* layout)
	\brief Sets the \a layout of the view.

	\param layout The \a layout to set.
*/


/*!
	\fn BLayout* BView::GetLayout() const
	\brief Get the layout of the view.

	\returns The layout of the view.
*/


//! @}