946 lines
22 KiB
Plaintext
946 lines
22 KiB
Plaintext
/*
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* Copyright 2013 Haiku Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* John Scipione, jscipione@gmail.com
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*
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* Corresponds to:
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* headers/os/interface/ListView.h hrev45555
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* src/kits/interface/ListView.cpp hrev45555
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*/
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/*!
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\file ListView.h
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\ingroup interface
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\ingroup libbe
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\brief ListView class definition.
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*/
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/*!
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\class BListView
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\ingroup interface
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\ingroup libbe
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\brief Displays a list of items that the user can select and invoke.
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BListView's can be one of two types set by the type parameter of the
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constructor:
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- \c B_SINGLE_SELECTION_LIST Can select only one item in the list at a
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time. This is the default.
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- \c B_MULTIPLE_SELECTION_LIST Can select any number of items by
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holding down Option for a discontinuous selection, or Shift for
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a contiguous selection.
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An example of a BListView looks like this:
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\image html BListView_example.png
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Click on an item to select it and double-click an item to invoke it. The
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BListView doesn't define what it means to "invoke" an item. See
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BListView::SetSelectionMessage() and BListView::SetInvocationMessage()
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to set a message to be set when these actions occur. You can also select
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and invoke items with keyboard keys such as the up and down arrow keys,
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Page Up and Page Down and the Enter key or Space key to invoke the item.
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This class is based on the BList class from the Support Kit and many of
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the methods it uses behave similarly.
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Although a BListView is scrollable, it doesn't provide scroll bars by
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itself. You should add the BListView as a child of a BScrollView to make
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it scrollable.
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The code to add a BListView to a BScrollView looks something like this:
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\code
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BListView* list = new BListView(frame, "List", B_SINGLE_SELECTION_LIST);
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list->AddItem(new BStringItem("Item 1"));
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list->AddItem(new BStringItem("Item 2"));
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...
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view->AddChild(new BScrollView("scroll_view", list,
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B_FOLLOW_LEFT | B_FOLLOW_TOP, 0, false, true));
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\endcode
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\see BScrollView for more information on scrolling views.
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\see BList in the Support Kit.
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\see BOutlineListView
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\see BListItem
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*/
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/*!
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\fn BListView::BListView(BRect frame, const char* name, list_view_type type,
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uint32 resizingMode, uint32 flags)
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\brief Creates a new list view. This is the non-layout constructor.
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\param frame The frame rectangle of the view.
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\param name The name of the view.
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\param type Whether the list view supports a single selection or multiple
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selections.
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\param resizingMode The resizing mode flags. See BView for details.
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\param flags The view flags. See BView for details.
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*/
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/*!
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\fn BListView::BListView(const char* name, list_view_type type,
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uint32 flags)
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\brief Creates a new list view suitable as part of a layout with the
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specified \a name, \a type, and \a flags.
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\param name The name of the view.
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\param type Whether the list view supports a single selection or multiple
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selections.
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\param flags The view flags. See BView for details.
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*/
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/*!
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\fn BListView::BListView(list_view_type type)
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\brief Creates a new list view suitable as part of a layout.
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\param type Whether the list view supports a single selection or multiple
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selections.
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*/
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/*!
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\fn BListView::BListView(BMessage* archive)
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\brief Creates a BListView object from the \a archive message.
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\param archive The message to create the object from.
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*/
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/*!
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\fn BListView::~BListView()
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\brief Delete the BListView object and free the memory used by it.
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This method does not free the attached list items.
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*/
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/*!
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\name Archiving
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*/
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//! @{
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/*!
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\fn BArchivable* BListView::Instantiate(BMessage* archive)
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\brief Create a new BListView object from the message \a archive.
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\param archive The message to create the object from.
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*/
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/*!
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\fn status_t BListView::Archive(BMessage* archive, bool deep) const
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\brief Archive the BListView object to a message.
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\param archive The message to archive the object to.
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\param deep \c true to archive child views.
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*/
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//! @}
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/*!
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\name Hook methods
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*/
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//! @{
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/*!
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\fn void BListView::Draw(BRect updateRect)
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\brief Hook method called to draw the contents of the text view.
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You should not have to call this method directly, use Invalidate() instead.
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\param updateRect The rectangular area to draw.
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\see BView::Draw()
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*/
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/*!
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\fn void BListView::AttachedToWindow()
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\brief Hook method called when the list view is added to the view hierarchy.
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\see BView::AttachedToWindow()
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*/
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/*!
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\fn void BListView::DetachedFromWindow()
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\brief Hook method that is called when the list view is removed from the
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view hierarchy.
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\see BView::DetachedFromWindow()
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*/
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/*!
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\fn void BListView::AllAttached()
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\brief Hook method called once all views are attached to the view.
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\see BView::AllAttached()
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*/
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/*!
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\fn void BListView::AllDetached()
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\brief Hook method called once all views are detached from the view.
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\see BView::AllDetached()
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*/
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/*!
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\fn void BListView::FrameResized(float width, float height)
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\brief Hook method called when the list view is resized.
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\param width The new \a width of the list view.
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\param height The new \a height of the list view.
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\see BView::FrameResized()
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*/
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/*!
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\fn void BListView::FrameMoved(BPoint new_position)
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\brief Hook method called when the list view is moved.
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\param new_position The list view's new position.
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*/
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/*!
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\fn void BListView::TargetedByScrollView(BScrollView *view)
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\brief Hook method called when the list view is attached to a BScrollView.
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\param view The BScrollView the list view is attached to.
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*/
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/*!
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\fn void BListView::WindowActivated(bool state)
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\brief Hook method that is called when the window becomes the active window
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or gives up that status.
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\param state If \c true, window has just been activated. If \c false the
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window has just been deactivated.
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\see BView::WindowActivated()
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*/
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/*!
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\fn void BListView::MessageReceived(BMessage* message)
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\brief Hook method called when a message is received by the list view.
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\param message The message received by the list view.
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\see BView::MessageReceived()
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*/
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/*!
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\fn void BListView::KeyDown(const char* bytes, int32 numBytes)
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\brief Hook method that is called when a key is pressed while the view is
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the focus view of the active window.
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The following keys are used by the list view by default:
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- Up Arrow Selects the previous item.
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- Down Arrow Selects the next item.
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- Page Up Selects the item one view height above the
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current item.
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- Page Down Selects the item one view height below the
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current item.
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- Home Selects the first item in the list.
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- End Select the last item in the list.
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- Enter and Spacebar Invokes the currently selected item.
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\param bytes The \a bytes representing the keys pushed down.
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\param numBytes The size of \a bytes.
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\see BView::KeyDown()
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*/
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/*!
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\fn void BListView::MouseDown(BPoint point)
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\brief Hook method that is called when a mouse button is pushed down while
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the cursor is contained in the view.
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By default this method selects items on a single click, and invokes them on a
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double click. This method calls InitiateDrag() to allow derived classes the
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opportunity to drag and drop items from the list.
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\param point The \a point where the mouse button was pushed down.
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\see BView::MouseDown()
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*/
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/*!
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\fn void BListView::MouseUp(BPoint where)
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\brief Hook method that is called when a mouse button is released while
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the cursor is contained in the view.
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\param where The location that the mouse button was released.
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\see BView::MouseUp()
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*/
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/*!
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\fn void BListView::MouseMoved(BPoint where, uint32 code,
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const BMessage* dragMessage)
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\brief Hook method that is called whenever the mouse cursor enters, exits
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or moves inside the list view.
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\param where The point where the mouse cursor has moved to.
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\param code A code which indicating if the mouse entered or exited the view.
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\param dragMessage A message containing drag and drop information.
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\see BView::MouseMoved()
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*/
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/*!
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\fn bool BListView::InitiateDrag(BPoint point, int32 index, bool wasSelected)
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\brief Hook method called when a drag and drop operation is initiated.
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This method is used by derived classes to implement drag and drop.
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This method is called by the MouseDown() method. If the derived
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class initiates the drag & drop operation you should return
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\c true, otherwise return \c false. By default this method returns
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\c false.
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\param point Where the drag & drop operation started.
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\param index
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\param wasSelected Indicates whether or not the item was selected.
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\returns \c true if a drag & drop operation was initiated, \c false
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otherwise.
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*/
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/*!
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\fn void BListView::SelectionChanged()
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\brief Hook method that is called when the selection changes.
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This method should be implemented by derived classes, the default
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implementation does nothing.
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*/
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//! @}
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/*!
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\name Resize methods
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*/
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//! @{
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/*!
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\fn void BListView::ResizeToPreferred()
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\brief Resize the view to it's preferred size.
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\see BView::ResizeToPreferred()
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*/
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/*!
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\fn void BListView::GetPreferredSize(float *_width, float *_height)
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\brief Fill out the \a _width and \a _height parameters with the preferred
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width and height of the list view.
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\param _width The list view's preferred width is written to \a _width.
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\param _height The list view's preferred height is written to \a _height.
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\see BView::GetPreferredSize()
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*/
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/*!
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\fn BSize BListView::MinSize()
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\brief Returns the minimum size of the list view.
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\return The minimum size of the list view as a BSize.
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\see BView::MinSize()
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*/
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/*!
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\fn BSize BListView::MaxSize()
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\brief Returns the maximum size of the list view.
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\return The maximum size of the list view as a BSize.
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\see BView::MaxSize()
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*/
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/*!
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\fn BSize BListView::PreferredSize()
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\brief Returns the preferred size of the list view.
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\return The preferred size of the list view as a BSize.
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\see BView::PreferredSize()
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*/
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//! @}
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/*!
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\fn void BListView::MakeFocus(bool focused)
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\brief Highlight or unhighlight the selection when the list view acquires
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or loses its focus state.
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\param focused \c true to receive focus or \c false to lose it.
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\see BView::MakeFocus()
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*/
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/*!
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\fn void BListView::SetFont(const BFont* font, uint32 mask)
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\brief Sets the font of the list view to \a font with the font
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parameters set by \a mask.
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\param font The \a font to set the list view to.
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\param mask A \a mask indicating which properties of \a font to set.
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\see BView::SetFont()
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*/
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/*!
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\fn void BListView::ScrollTo(BPoint point)
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\brief Scroll the view to the specified \a point.
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\param point The location to scroll the list view to.
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\see BView::ScrollTo()
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*/
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/*!
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\name Add and remove item methods
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*/
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//! @{
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/*!
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\fn bool BListView::AddItem(BListItem *item, int32 index)
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\brief Add an \a item to the list view at the specified \a index.
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\param item The list item to add.
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\param index The \a index of where to add the list item, if not
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specified the item is added to the end.
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\return \c true if the list item was added, \c false otherwise.
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*/
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/*!
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\fn bool BListView::AddList(BList* list, int32 index)
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\brief Add a \a list of list items to the list view at the specified
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\a index.
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\param list The \a list of list items to add.
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\param index The \a index of where to add the list, if not specified the
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\a list is added to the end.
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\return \c true if the \a list was added, \c false otherwise.
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*/
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/*!
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\fn bool BListView::AddList(BList* list)
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\brief Add a \a list of list items to the end of the list view.
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\param list The \a list of list items to add.
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\return \c true if the \a list was added, \c false otherwise.
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*/
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/*!
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\fn BListItem* BListView::RemoveItem(int32 index)
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\brief Remove the item at \a index from the list.
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\param index The \a index of the item to remove.
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\return \c true if the item was removed, \c false otherwise.
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*/
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/*!
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\fn bool BListView::RemoveItem(BListItem* item)
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\brief Remove the specified list item.
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\param item The list item to remove.
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\return \c true if the \a item was removed, \c false otherwise.
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*/
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/*!
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\fn bool BListView::RemoveItems(int32 index, int32 count)
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\brief Removes the items from \a index and the next \a count items.
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\param index The location to start removing items from.
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\param count The number of items past \a index to remove.
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return \c true if the \a items were removed, \c false otherwise.
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*/
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//! @}
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/*!
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\name Selection and Invocation message methods
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*/
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//! @{
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/*!
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\fn void BListView::SetSelectionMessage(BMessage* message)
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\brief Sets the \a message that the list view sends when a new item
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is selected.
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\param message The selection \a message to set.
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*/
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/*!
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\fn void BListView::SetInvocationMessage(BMessage* message)
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Sets the \a message that the list view sends when an item is invoked.
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\param message The invocation \a message to set.
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\see BInvoker::SetMessage()
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*/
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/*!
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\fn BMessage* BListView::InvocationMessage() const
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\brief Returns the message that is send when an item is invoked.
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\return The current invocation method as a BMessage.
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\see BInvoker::Message()
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*/
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/*!
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\fn uint32 BListView::InvocationCommand() const
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\brief Returns the what parameter of the current invocation method.
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\returns The what parameter of the currently set invocation method.
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\see BInvoker::Command()
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*/
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/*!
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\fn BMessage* BListView::SelectionMessage() const
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\brief Returns the message that is send when an item is selected.
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\return The current selection message as a BMessage.
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*/
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/*!
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\fn uint32 BListView::SelectionCommand() const
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\brief Returns the what parameter of the message that is send when an item is
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selected.
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\return The what parameter of the current selection message.
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*/
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//! @}
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/*!
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\name List type methods
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*/
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//! @{
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/*!
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\fn void BListView::SetListType(list_view_type type)
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\brief Sets the list view \a type.
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\param type The list view \a type to set.
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*/
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/*!
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\fn list_view_type BListView::ListType() const
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\brief Returns the current list view type.
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\return The list view type.
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*/
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//! @}
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/*!
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\name List methods
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*/
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//! @{
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/*!
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\fn BListItem* BListView::ItemAt(int32 index) const
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\brief Returns the list item at the specified \a index.
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\param index
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\return The list item at the specified \a index.
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*/
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/*!
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\fn int32 BListView::IndexOf(BListItem* item) const
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\brief Returns the index of the specified \a item.
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\param item The list item to get the index of.
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\return The index of the specified \a item.
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*/
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/*!
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\fn int32 BListView::IndexOf(BPoint point) const
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\brief Returns the index of the item at the specified \a point.
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\param point The location of the list item to get the index of.
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\return The index of the list item at the specified \a point.
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*/
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/*!
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\fn BListItem* BListView::FirstItem() const
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\brief Returns a pointer to the first list item.
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\return A pointer to the first item in the list or \c NULL there are no items.
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*/
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/*!
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\fn BListItem* BListView::LastItem() const
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\brief Returns a pointer to the last list item.
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\return A pointer to the last item in the list or \c NULL there are no items.
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*/
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/*!
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\fn bool BListView::HasItem(BListItem* item) const
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\brief Returns whether or not the list contains the specified \a item.
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\param item The list item to check.
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\return \c true if \a item is in the list, \c false otherwise.
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*/
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/*!
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\fn int32 BListView::CountItems() const
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\brief Returns the number of items contained in the list view.
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\return The number of items.
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*/
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/*!
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\fn void BListView::MakeEmpty()
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\brief Empties the list view of all items.
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*/
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/*!
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\fn bool BListView::IsEmpty() const
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\brief Returns whether or not the list view is empty.
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\return \c true if the list view is empty, \c false otherwise.
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*/
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/*!
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\fn void BListView::DoForEach(bool (*func)(BListItem* item))
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\brief Calls the specified function on each item in the list.
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The \a func is called on the items in order starting with the item at
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index 0 and ending at the last item in the list. This method stops
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calling the \a func once it returns \a true or the end of the list
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is reached.
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The first argument of \a func is a pointer to the list item.
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\param func The function to call on each item.
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*/
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/*!
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\fn void BListView::DoForEach(bool (*func)(BListItem* item, void* arg),
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void* arg)
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\brief Calls the specified function on each item in the list.
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The \a func is called on the items in order starting with the item at
|
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index 0 and ending at the last item in the list. This method stops
|
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calling the \a func once it returns \a true or the end of the list
|
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is reached.
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The first argument of \a func is a pointer to the list item, \a arg is
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passed in as the second argument.
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\param func The function to call on each item.
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\param arg The second argument of the function.
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*/
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/*!
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\fn const BListItem** BListView::Items() const
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\brief Returns a pointer to the list of list items.
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\returns a pointer to the list of list items.
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*/
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//! @}
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/*!
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\fn void BListView::InvalidateItem(int32 index)
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\brief Draws the list item at the specified \a index.
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\param index The \a index of the list item to draw.
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*/
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/*!
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\name Selection methods
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*/
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//! @{
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/*!
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\fn void BListView::ScrollToSelection()
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\brief Scrolls to selected list item.
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*/
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/*!
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\fn void BListView::Select(int32 index, bool extend)
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\brief Selects the list item at the specified \a index.
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\param index The \a index of the item to select.
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\param extend Whether or not to also select child items.
|
|
*/
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/*!
|
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\fn void BListView::Select(int32 start, int32 finish, bool extend)
|
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\brief Select items from \a start to \a finish.
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\param start The index of the item to start the selection.
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|
\param finish The index of the item to end the selection.
|
|
\param extend Whether or not to also select child items.
|
|
*/
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/*!
|
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\fn bool BListView::IsItemSelected(int32 index) const
|
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\brief Returns whether or not the item at \a index is selected.
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\return \c true if the item was selected, \c false otherwise.
|
|
*/
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/*!
|
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\fn int32 BListView::CurrentSelection(int32 index) const
|
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\brief Returns the index of a currently selected item relative to the passed
|
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in \a index.
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If the index of the selected item is lower than \a index the value returned
|
|
is negative, if the index of the selected item is greater than \a index the
|
|
value returned is positive. If the index of the selected item is equal to
|
|
\a index then 0 is returned.
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|
|
\param index The \a index of the item to get relative to the selected item's
|
|
index.
|
|
*/
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//! @}
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/*!
|
|
\fn status_t BListView::Invoke(BMessage* message)
|
|
\brief Invoke the list view, either with the current invocation message or
|
|
\a message if it is specified.
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|
\param message The message to send or \c NULL to send the current invocation
|
|
message.
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|
|
\see BControl::Invoke()
|
|
*/
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|
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/*!
|
|
\name Deselection methods
|
|
*/
|
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|
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|
|
//! @{
|
|
|
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|
|
/*!
|
|
\fn void BListView::DeselectAll()
|
|
\brief Deselect all items.
|
|
*/
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|
|
|
|
/*!
|
|
\fn void BListView::DeselectExcept(int32 exceptFrom, int32 exceptTo)
|
|
\brief Deselect all items except the items with index in the range of
|
|
\a exceptFrom to \a exceptTo.
|
|
|
|
\param exceptFrom The index of the start of the exception list.
|
|
\param exceptTo The index of the end of the exception list.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn void BListView::Deselect(int32 index)
|
|
\brief Deselect the item at \a index.
|
|
|
|
\param index The \a index of the item to deselect.
|
|
*/
|
|
|
|
|
|
//! @}
|
|
|
|
|
|
/*!
|
|
\fn void BListView::SortItems(int (*cmp)(const void *, const void *))
|
|
\brief Sort the items according the the passed in \a cmp function.
|
|
|
|
\param cmp The compare function to use to sort the items.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn bool BListView::SwapItems(int32 a, int32 b)
|
|
\brief Swap item \a a with item \a b.
|
|
|
|
\param a The index of the first item to swap.
|
|
\param b The index of the second item to swap.
|
|
|
|
\return \c true if the items were swapped, \c false otherwise.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn bool BListView::MoveItem(int32 from, int32 to)
|
|
\brief Move the item at index \a from to the position in the list at index \a to.
|
|
|
|
\param from The index of the item to move.
|
|
\param to The index to move the item to.
|
|
|
|
\return \c true if the item was moved, \c false otherwise.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn bool BListView::ReplaceItem(int32 index, BListItem* item)
|
|
\brief Replace the item at index \a index with \a item.
|
|
|
|
\param index The \a index of the item to replace.
|
|
\param item The \a item to replace the item at \a index with.
|
|
|
|
\return \c true if the item was replaced, \c false otherwise.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn BRect BListView::ItemFrame(int32 index)
|
|
\brief Return the frame of the item at the specified \a index.
|
|
|
|
\param index The \a index of the item to get the frame of.
|
|
|
|
\returns The frame of the item at \a index.
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn BHandler* BListView::ResolveSpecifier(BMessage* message, int32 index,
|
|
BMessage* specifier, int32 form, const char* property);
|
|
\brief Returns the proper handler for the passed in scripting \a message.
|
|
|
|
\param message The scripting message to determine the handler.
|
|
\param index The index of the specifier.
|
|
\param specifier The message which contains the specifier.
|
|
\param form The 'what' field of the specifier message.
|
|
\param property The name of the target property.
|
|
|
|
\return The proper BHandler for the passed in scripting \a message.
|
|
|
|
\see BView::ResolveSpecifier()
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn status_t BListView::GetSupportedSuites(BMessage* data)
|
|
\brief Reports the suites of messages and specifiers that derived classes
|
|
understand.
|
|
|
|
\param data The message to report the suite of messages and specifiers.
|
|
|
|
\see BView::GetSupportedSuites()
|
|
*/
|
|
|
|
|
|
/*!
|
|
\fn status_t BListView::Perform(perform_code code, void* _data)
|
|
\brief Performs an action give a perform_code and data. (Internal Method)
|
|
|
|
\param code The perform code
|
|
\param _data A pointer to some data to perform on
|
|
|
|
\return A status code.
|
|
|
|
\see BView::Perform()
|
|
*/
|