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fltk/FL/Fl_Widget.H
Albrecht Schlosser d056119310 Reworded description of calling the virtual draw() method for embedded 
widgets in FL/Fl_Widget.H, as discussed in fltk.development, with an
additional hint that draw() is virtual.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6753 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2009-04-12 09:40:59 +00:00

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//
// "$Id$"
//
// Widget header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2009 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
/* \file
Fl_Widget, Fl_Label classes . */
#ifndef Fl_Widget_H
#define Fl_Widget_H
#include "Enumerations.H"
class Fl_Widget;
class Fl_Window;
class Fl_Group;
class Fl_Image;
/** Default callback type definition for all fltk widgets (by far the most used) */
typedef void (Fl_Callback )(Fl_Widget*, void*);
/** Default callback type pointer definition for all fltk widgets */
typedef Fl_Callback* Fl_Callback_p; // needed for BORLAND
/** One parameter callback type definition passing only the widget */
typedef void (Fl_Callback0)(Fl_Widget*);
/** Callback type definition passing the widget and a long data value */
typedef void (Fl_Callback1)(Fl_Widget*, long);
/** This struct stores all information for a text or mixed graphics label.
\todo For FLTK 1.3, the Fl_Label type will become a widget by itself. That way
we will be avoiding a lot of code duplication by handling labels in
a similar fashion to widgets containing text. We also provide an easy
interface for very complex labels, containing html or vector graphics.
*/
struct FL_EXPORT Fl_Label {
/** label text */
const char* value;
/** optional image for an active label */
Fl_Image* image;
/** optional image for a deactivated label */
Fl_Image* deimage;
/** type of label. \see Fl_Labeltype */
uchar type;
/** label font used in text */
Fl_Font font;
/** size of label font */
Fl_Fontsize size;
/** text color */
unsigned color;
/** Draws the label aligned to the given box */
void draw(int,int,int,int, Fl_Align) const ;
void measure(int &w, int &h) const ;
};
/** Fl_Widget is the base class for all widgets in FLTK.
You can't create one of these because the constructor is not public.
However you can subclass it.
All "property" accessing methods, such as color(), parent(), or argument()
are implemented as trivial inline functions and thus are as fast and small
as accessing fields in a structure. Unless otherwise noted, the property
setting methods such as color(n) or label(s) are also trivial inline
functions, even if they change the widget's appearance. It is up to the
user code to call redraw() after these.
*/
class FL_EXPORT Fl_Widget {
friend class Fl_Group;
Fl_Group* parent_;
Fl_Callback* callback_;
void* user_data_;
int x_,y_,w_,h_;
Fl_Label label_;
int flags_;
unsigned color_;
unsigned color2_;
uchar type_;
uchar damage_;
uchar box_;
Fl_Align align_:8;
uchar when_;
const char *tooltip_;
/** unimplemented copy ctor */
Fl_Widget(const Fl_Widget &);
/** unimplemented assignment operator */
Fl_Widget& operator=(const Fl_Widget &);
protected:
/** Creates a widget at the given position and size.
The Fl_Widget is a protected constructor, but all derived widgets have a
matching public constructor. It takes a value for x(), y(), w(), h(), and
an optional value for label().
\param[in] x, y the position of the widget relative to the enclosing window
\param[in] w, h size of the widget in pixels
\param[in] label optional text for the widget label
*/
Fl_Widget(int x, int y, int w, int h, Fl_CString label=0L);
/** Internal use only. Use position(int,int), size(int,int) or resize(int,int,int,int) instead. */
void x(int v) {x_ = v;}
/** Internal use only. Use position(int,int), size(int,int) or resize(int,int,int,int) instead. */
void y(int v) {y_ = v;}
/** Internal use only. Use position(int,int), size(int,int) or resize(int,int,int,int) instead. */
void w(int v) {w_ = v;}
/** Internal use only. Use position(int,int), size(int,int) or resize(int,int,int,int) instead. */
void h(int v) {h_ = v;}
/** Gets the widget flags mask */
int flags() const {return flags_;}
/** Sets a flag in the flags mask */
void set_flag(int c) {flags_ |= c;}
/** Clears a flag in the flags mask */
void clear_flag(int c) {flags_ &= ~c;}
/** flags possible values enumeration.
See activate(), output(), visible(), changed(), set_visible_focus()
*/
enum {
INACTIVE=1, ///< the widget can't receive focus, and is disabled but potentially visible
INVISIBLE=2, ///< the widget is not drawn but can receive events
OUTPUT=4, ///< for output only
SHORTCUT_LABEL=64, ///< the label contains a shortcut we need to draw
CHANGED=128, ///< the widget value changed
VISIBLE_FOCUS=512, ///< accepts keyboard focus navigation if the widget can have the focus
COPIED_LABEL=1024 ///< the widget label is internally copied, its destruction is handled by the widget
};
void draw_box() const;
void draw_box(Fl_Boxtype t, Fl_Color c) const;
void draw_box(Fl_Boxtype t, int x,int y,int w,int h, Fl_Color c) const;
/** draws a focus rectangle around the widget */
void draw_focus() {draw_focus(box(),x(),y(),w(),h());}
void draw_focus(Fl_Boxtype t, int x,int y,int w,int h) const;
void draw_label() const;
void draw_label(int, int, int, int) const;
public:
/** Destroys the widget.
Destroying single widgets is not very common. You almost always want to
destroy the parent group instead, which will destroy all of the child widgets
and groups in that group.
\since FLTK 1.3, the widget's destructor removes the widget from its parent
group, if it is member of a group.
*/
virtual ~Fl_Widget();
/** Draws the widget.
Never call this function directly. FLTK will schedule redrawing whenever
needed. If your widget must be redrawn as soon as possible, call redraw()
instead.
Override this function to draw your own widgets.
If you ever need to call another widget's draw method <I>from within your
own draw() method</I>, e.g. for an embedded scrollbar, you can do it
(because draw() is virtual) like this:
\code
Fl_Widget *s = &scroll; // scroll is an embedded Fl_Scrollbar
s->draw(); // calls Fl_Scrollbar::draw()
\endcode
*/
virtual void draw() = 0;
/** Handles the specified event.
You normally don't call this method directly, but instead let FLTK do
it when the user interacts with the widget.
When implemented in a widget, this function must return 0 if the
widget does not use the event or 1 otherwise.
Most of the time, you want to call the inherited handle() method in
your overridden method so that you don't short-circuit events that you
don't handle. In this last case you should return the callee retval.
\param[in] event the kind of event received
\retval 0 if the event was not used or understood
\retval 1 if the event was used and can be deleted
\see Fl_Event
*/
virtual int handle(int event);
/** Returns a pointer to the parent widget.
Usually this is a Fl_Group or Fl_Window.
\retval NULL if the widget has no parent
\see Fl_Group::add(Fl_Widget*)
*/
Fl_Group* parent() const {return parent_;}
/** Internal use only - "for hacks only".
It is \em \b STRONGLY recommended not to use this method, because it
short-circuits Fl_Group's normal widget adding and removing methods,
if the widget is already a child widget of another Fl_Group.
Use Fl_Group::add(Fl_Widget*) and/or Fl_Group::remove(Fl_Widget*) instead.
*/
void parent(Fl_Group* p) {parent_ = p;} // for hacks only, use Fl_Group::add()
/** Gets the widget type.
Returns the widget type value, which is used for Forms compatibility
and to simulate RTTI.
\todo Explain "simulate RTTI" (currently only used to decide if a widget
is a window, i.e. type()>=FL_WINDOW ?). Is type() really used in a way
that ensures "Forms compatibility" ?
*/
uchar type() const {return type_;}
/** Sets the widget type.
This is used for Forms compatibility.
*/
void type(uchar t) {type_ = t;}
/** Gets the widget position in its window.
\return the x position relative to the window
*/
int x() const {return x_;}
/** Gets the widget position in its window.
\return the y position relative to the window
*/
int y() const {return y_;}
/** Gets the widget width.
\return the width of the widget in pixels.
*/
int w() const {return w_;}
/** Gets the widget height.
\return the height of the widget in pixels.
*/
int h() const {return h_;}
/** Changes the size or position of the widget.
This is a virtual function so that the widget may implement its
own handling of resizing. The default version does \e not
call the redraw() method, but instead relies on the parent widget
to do so because the parent may know a faster way to update the
display, such as scrolling from the old position.
Some window managers under X11 call resize() a lot more often
than needed. Please verify that the position or size of a widget
did actually change before doing any extensive calculations.
position(X, Y) is a shortcut for resize(X, Y, w(), h()),
and size(W, H) is a shortcut for resize(x(), y(), W, H).
\param[in] x, y new position relative to the parent window
\param[in] w, h new size
\see position(int,int), size(int,int)
*/
virtual void resize(int x, int y, int w, int h);
/** Internal use only. */
int damage_resize(int,int,int,int);
/** Repositions the window or widget.
position(X, Y) is a shortcut for resize(X, Y, w(), h()).
\param[in] X, Y new position relative to the parent window
\see resize(int,int,int,int), size(int,int)
*/
void position(int X,int Y) {resize(X,Y,w_,h_);}
/** Changes the size of the widget.
size(W, H) is a shortcut for resize(x(), y(), W, H).
\param[in] W, H new size
\see position(int,int), resize(int,int,int,int)
*/
void size(int W,int H) {resize(x_,y_,W,H);}
/** Gets the label alignment.
\return label alignment
\see label(), align(Fl_Align), Fl_Align
\todo This function should not take uchar as an argument.
Apart from the fact that uchar is too short with only 8 bits,
it does not provide type safety (in which case we don't need
to declare Fl_Align an enum to begin with).
*NOTE* The current (FLTK 1.3) implementation (Dec 2008) is such that
Fl_Align is (typedef'd to be) "unsigned" (int), but Fl_Widget's
"align_" member variable is a bit field of 8 bits only !
*/
Fl_Align align() const {return align_;}
/** Sets the label alignment.
This controls how the label is displayed next to or inside the widget.
The default value is FL_ALIGN_CENTER, which centers the label inside
the widget.
\param[in] alignment new label alignment
\see align(), Fl_Align
*/
void align(Fl_Align alignment) {align_ = alignment;}
/** Gets the box type of the widget.
\return the current box type
\see box(Fl_Boxtype), Fl_Boxtype
*/
Fl_Boxtype box() const {return (Fl_Boxtype)box_;}
/** Sets the box type for the widget.
This identifies a routine that draws the background of the widget.
See Fl_Boxtype for the available types. The default depends on the
widget, but is usually FL_NO_BOX or FL_UP_BOX.
\param[in] new_box the new box type
\see box(), Fl_Boxtype
*/
void box(Fl_Boxtype new_box) {box_ = new_box;}
/** Gets the background color of the widget.
\return current background color
\see color(unsigned), color(unsigned, unsigned)
*/
Fl_Color color() const {return (Fl_Color)color_;}
/** Sets the background color of the widget.
The color is passed to the box routine. The color is either an index into
an internal table of RGB colors or an RGB color value generated using
fl_rgb_color().
The default for most widgets is FL_BACKGROUND_COLOR. Use Fl::set_color()
to redefine colors in the color map.
\param[in] bg background color
\see color(), color(unsigned, unsigned), selection_color(unsigned)
*/
void color(unsigned bg) {color_ = bg;}
/** Gets the selection color.
\return the current selection color
\see selection_color(unsigned), color(unsigned, unsigned)
*/
Fl_Color selection_color() const {return (Fl_Color)color2_;}
/** Sets the selection color.
The selection color is defined for Forms compatibility and is usually
used to color the widget when it is selected, although some widgets
use this color for other purposes. You can set both colors at once
with color(unsigned bg, unsigned sel).
\param[in] a the new selection color
\see selection_color(), color(unsigned, unsigned)
*/
void selection_color(unsigned a) {color2_ = a;}
/** Sets the background and selection color of the widget.
The two color form sets both the background and selection colors.
\param[in] bg background color
\param[in] sel selection color
\see color(unsigned), selection_color(unsigned)
*/
void color(unsigned bg, unsigned sel) {color_=bg; color2_=sel;}
/** Gets the current label text.
\return a pointer to the current label text
\see label(Fl_CString), copy_label(Fl_CString)
*/
const char* label() const {return label_.value;}
/** Sets the current label pointer.
The label is shown somewhere on or next to the widget. The passed pointer
is stored unchanged in the widget (the string is \em not copied), so if
you need to set the label to a formatted value, make sure the buffer is
static, global, or allocated. The copy_label() method can be used
to make a copy of the label string automatically.
\param[in] text pointer to new label text
\see copy_label()
*/
void label(const char* text);
/** Sets the current label.
Unlike label(), this method allocates a copy of the label
string instead of using the original string pointer.
The internal copy will automatically be freed whenever you assign
a new label or when the widget is destroyed.
\param[in] new_label the new label text
\see label()
*/
void copy_label(Fl_CString new_label);
/** Shortcut to set the label text and type in one call.
\see label(FL_CString), labeltype(Fl_Labeltype)
*/
void label(Fl_Labeltype a, const char* b) {label_.type = a; label_.value = b;}
/** Gets the label type.
\return the current label type.
\see Fl_Labeltype
*/
Fl_Labeltype labeltype() const {return (Fl_Labeltype)label_.type;}
/** Sets the label type.
The label type identifies the function that draws the label of the widget.
This is generally used for special effects such as embossing or for using
the label() pointer as another form of data such as an icon. The value
FL_NORMAL_LABEL prints the label as plain text.
\param[in] a new label type
\see Fl_Labeltype
*/
void labeltype(Fl_Labeltype a) {label_.type = a;}
/** Gets the label color.
The default color is FL_FOREGROUND_COLOR.
\return the current label color
*/
Fl_Color labelcolor() const {return (Fl_Color)label_.color;}
/** Sets the label color.
The default color is FL_FOREGROUND_COLOR.
\param[in] c the new label color
*/
void labelcolor(unsigned c) {label_.color=c;}
/** Gets the font to use.
Fonts are identified by indexes into a table. The default value
uses a Helvetica typeface (Arial for Microsoft&reg; Windows&reg;).
The function Fl::set_font() can define new typefaces.
\return current font used by the label
\see Fl_Font
*/
Fl_Font labelfont() const {return label_.font;}
/** Sets the font to use.
Fonts are identified by indexes into a table. The default value
uses a Helvetica typeface (Arial for Microsoft&reg; Windows&reg;).
The function Fl::set_font() can define new typefaces.
\param[in] f the new font for the label
\see Fl_Font
*/
void labelfont(Fl_Font f) {label_.font=f;}
/** Gets the font size in pixels.
The default size is 14 pixels.
\return the current font size
*/
Fl_Fontsize labelsize() const {return label_.size;}
/** Sets the font size in pixels.
\param[in] pix the new font size
\see Fl_Fontsize labelsize()
*/
void labelsize(Fl_Fontsize pix) {label_.size=pix;}
/** Gets the image that is used as part of the widget label.
This image is used when drawing the widget in the active state.
\return the current image
*/
Fl_Image* image() {return label_.image;}
/** Sets the image to use as part of the widget label.
This image is used when drawing the widget in the active state.
\param[in] img the new image for the label
*/
void image(Fl_Image* img) {label_.image=img;}
/** Sets the image to use as part of the widget label.
This image is used when drawing the widget in the active state.
\param[in] img the new image for the label
*/
void image(Fl_Image& img) {label_.image=&img;}
/** Gets the image that is used as part of the widget label.
This image is used when drawing the widget in the inactive state.
\return the current image for the deactivated widget
*/
Fl_Image* deimage() {return label_.deimage;}
/** Sets the image to use as part of the widget label.
This image is used when drawing the widget in the inactive state.
\param[in] img the new image for the deactivated widget
*/
void deimage(Fl_Image* img) {label_.deimage=img;}
/** Sets the image to use as part of the widget label.
This image is used when drawing the widget in the inactive state.
\param[in] img the new image for the deactivated widget
*/
void deimage(Fl_Image& img) {label_.deimage=&img;}
/** Gets the current tooltip text.
\return a pointer to the tooltip text or NULL
*/
const char *tooltip() const {return tooltip_;}
/** Sets the current tooltip text.
Sets a string of text to display in a popup tooltip window when the user
hovers the mouse over the widget. The string is <I>not</I> copied, so
make sure any formatted string is stored in a static, global,
or allocated buffer.
If no tooltip is set, the tooltip of the parent is inherited. Setting a
tooltip for a group and setting no tooltip for a child will show the
group's tooltip instead. To avoid this behavior, you can set the child's
tooltip to an empty string ("").
\param[in] t new tooltip
*/
void tooltip(const char *t);
/** Gets the current callback function for the widget.
Each widget has a single callback.
\return current callback
*/
Fl_Callback_p callback() const {return callback_;}
/** Sets the current callback function for the widget.
Each widget has a single callback.
\param[in] cb new callback
\param[in] p user data
*/
void callback(Fl_Callback* cb, void* p) {callback_=cb; user_data_=p;}
/** Sets the current callback function for the widget.
Each widget has a single callback.
\param[in] cb new callback
*/
void callback(Fl_Callback* cb) {callback_=cb;}
/** Sets the current callback function for the widget.
Each widget has a single callback.
\param[in] cb new callback
*/
void callback(Fl_Callback0*cb) {callback_=(Fl_Callback*)cb;}
/** Sets the current callback function for the widget.
Each widget has a single callback.
\param[in] cb new callback
\param[in] p user data
*/
void callback(Fl_Callback1*cb, long p=0) {callback_=(Fl_Callback*)cb; user_data_=(void*)p;}
/** Gets the user data for this widget.
Gets the current user data (void *) argument that is passed to the callback function.
\return user data as a pointer
*/
void* user_data() const {return user_data_;}
/** Sets the user data for this widget.
Sets the new user data (void *) argument that is passed to the callback function.
\param[in] v new user data
*/
void user_data(void* v) {user_data_ = v;}
/** Gets the current user data (long) argument that is passed to the callback function.
*/
long argument() const {return (long)user_data_;}
/** Sets the current user data (long) argument that is passed to the callback function.
\todo The user data value must be implemented using a \em union to avoid
64 bit machine incompatibilities.
*/
void argument(long v) {user_data_ = (void*)v;}
/** Returns the conditions under which the callback is called.
You can set the flags with when(uchar), the default value is
FL_WHEN_RELEASE.
\return set of flags
\see when(uchar)
*/
Fl_When when() const {return (Fl_When)when_;}
/** Sets the flags used to decide when a callback is called.
This controls when callbacks are done. The following values are useful,
the default value is FL_WHEN_RELEASE:
\li 0: The callback is not done, but changed() is turned on.
\li FL_WHEN_CHANGED: The callback is done each time the text is
changed by the user.
\li FL_WHEN_RELEASE: The callback will be done when this widget loses
the focus, including when the window is unmapped. This is a useful
value for text fields in a panel where doing the callback on every
change is wasteful. However the callback will also happen if the
mouse is moved out of the window, which means it should not do
anything visible (like pop up an error message).
You might do better setting this to zero, and scanning all the
items for changed() when the OK button on a panel is pressed.
\li FL_WHEN_ENTER_KEY: If the user types the Enter key, the entire
text is selected, and the callback is done if the text has changed.
Normally the Enter key will navigate to the next field (or insert
a newline for a Fl_Multiline_Input) - this changes the behavior.
\li FL_WHEN_ENTER_KEY|FL_WHEN_NOT_CHANGED: The Enter key will do the
callback even if the text has not changed. Useful for command fields.
Fl_Widget::when() is a set of bitflags used by subclasses of
Fl_Widget to decide when to do the callback.
If the value is zero then the callback is never done. Other values
are described in the individual widgets. This field is in the base
class so that you can scan a panel and do_callback() on all the ones
that don't do their own callbacks in response to an "OK" button.
\param[in] i set of flags
*/
void when(uchar i) {when_ = i;}
/** Returns whether a widget is visible.
\retval 0 if the widget is not drawn and hence invisible.
\see show(), hide(), visible_r()
*/
int visible() const {return !(flags_&INVISIBLE);}
/** Returns whether a widget and all its parents are visible.
\retval 0 if the widget or any of its parents are invisible.
\see show(), hide(), visible()
*/
int visible_r() const;
/** Makes a widget visible.
An invisible widget never gets redrawn and does not get events.
The visible() method returns true if the widget is set to be
visible. The visible_r() method returns true if the widget and
all of its parents are visible. A widget is only visible if
visible() is true on it <I>and all of its parents</I>.
Changing it will send FL_SHOW or FL_HIDE events to
the widget. <I>Do not change it if the parent is not visible, as this
will send false FL_SHOW or FL_HIDE events to the widget</I>.
redraw() is called if necessary on this or the parent.
\see hide(), visible(), visible_r()
*/
virtual void show();
/** Makes a widget invisible.
\see show(), visible(), visible_r()
*/
virtual void hide();
/** Makes the widget visible.
You must still redraw the parent widget to see a change in the
window. Normally you want to use the show() method instead.
*/
void set_visible() {flags_ &= ~INVISIBLE;}
/** Hides the widget.
You must still redraw the parent to see a change in the window.
Normally you want to use the hide() method instead.
*/
void clear_visible() {flags_ |= INVISIBLE;}
/** Returns whether the widget is active.
\retval 0 if the widget is inactive
\see active_r(), activate(), deactivate()
*/
int active() const {return !(flags_&INACTIVE);}
/** Returns whether the widget and all of its parents are active.
\retval 0 if this or any of the parent widgets are inactive
\see active(), activate(), deactivate()
*/
int active_r() const;
/** Activates the widget.
Changing this value will send FL_ACTIVATE to the widget if
active_r() is true.
\see active(), active_r(), deactivate()
*/
void activate();
/** Deactivates the widget.
Inactive widgets will be drawn "grayed out", e.g. with less contrast
than the active widget. Inactive widgets will not receive any keyboard
or mouse button events. Other events (including FL_ENTER, FL_MOVE,
FL_LEAVE, FL_SHORTCUT, and others) will still be sent. A widget is
only active if active() is true on it <I>and all of its parents</I>.
Changing this value will send FL_DEACTIVATE to the widget if
active_r() is true.
Currently you cannot deactivate Fl_Window widgets.
\see activate(), active(), active_r()
*/
void deactivate();
/** Returns if a widget is used for output only.
output() means the same as !active() except it does not change how the
widget is drawn. The widget will not receive any events. This is useful
for making scrollbars or buttons that work as displays rather than input
devices.
\retval 0 if the widget is used for input and output
\see set_output(), clear_output()
*/
int output() const {return (flags_&OUTPUT);}
/** Sets a widget to output only.
\see output(), clear_output()
*/
void set_output() {flags_ |= OUTPUT;}
/** Sets a widget to accept input.
\see set_output(), output()
*/
void clear_output() {flags_ &= ~OUTPUT;}
/** Returns if the widget is able to take events.
This is the same as (active() && !output()
&& visible()) but is faster.
\retval 0 if the widget takes no events
*/
int takesevents() const {return !(flags_&(INACTIVE|INVISIBLE|OUTPUT));}
/**
Checks if the widget value changed since the last callback.
"Changed" is a flag that is turned on when the user changes the value
stored in the widget. This is only used by subclasses of Fl_Widget that
store values, but is in the base class so it is easier to scan all the
widgets in a panel and do_callback() on the changed ones in response
to an "OK" button.
Most widgets turn this flag off when they do the callback, and when
the program sets the stored value.
\retval 0 if the value did not change
\see set_changed(), clear_changed()
*/
int changed() const {return flags_&CHANGED;}
/** Marks the value of the widget as changed.
\see changed(), clear_changed()
*/
void set_changed() {flags_ |= CHANGED;}
/** Marks the value of the widget as unchanged.
\see changed(), set_changed()
*/
void clear_changed() {flags_ &= ~CHANGED;}
/** Gives the widget the keyboard focus.
Tries to make this widget be the Fl::focus() widget, by first sending
it an FL_FOCUS event, and if it returns non-zero, setting
Fl::focus() to this widget. You should use this method to
assign the focus to a widget.
\return true if the widget accepted the focus.
*/
int take_focus();
/** Enables keyboard focus navigation with this widget.
Note, however, that this will not necessarily mean that the widget
will accept focus, but for widgets that can accept focus, this method
enables it if it has been disabled.
\see visible_focus(), clear_visible_focus(), visible_focus(int)
*/
void set_visible_focus() { flags_ |= VISIBLE_FOCUS; }
/** Disables keyboard focus navigation with this widget.
Normally, all widgets participate in keyboard focus navigation.
\see set_visible_focus(), visible_focus(), visible_focus(int)
*/
void clear_visible_focus() { flags_ &= ~VISIBLE_FOCUS; }
/** Modifies keyboard focus navigation.
\param[in] v set or clear visible focus
\see set_visible_focus(), clear_visible_focus(), visible_focus()
*/
void visible_focus(int v) { if (v) set_visible_focus(); else clear_visible_focus(); }
/** Checks whether this widget has a visible focus.
\retval 0 if this widget has no visible focus.
\see visible_focus(int), set_visible_focus(), clear_visible_focus()
*/
int visible_focus() { return flags_ & VISIBLE_FOCUS; }
/** Sets the default callback for all widgets.
Sets the default callback, which puts a pointer to the widget on the queue
returned by Fl::readqueue(). You may want to call this from your own callback.
\param[in] cb the new callback
\param[in] d user data associated with that callback
\see callback(), do_callback(), Fl::readqueue()
*/
static void default_callback(Fl_Widget *cb, void *d);
/** Calls the widget callback.
Causes a widget to invoke its callback function with default arguments.
\see callback()
*/
void do_callback() {do_callback(this,user_data_);}
/** Calls the widget callback.
Causes a widget to invoke its callback function with arbitrary arguments.
\param[in] o call the callback with \p o as the widget argument
\param[in] arg call the callback with \p arg as the user data argument
\see callback()
*/
void do_callback(Fl_Widget* o,long arg) {do_callback(o,(void*)arg);}
// Causes a widget to invoke its callback function with arbitrary arguments.
// Documentation and implementation in Fl_Widget.cxx
void do_callback(Fl_Widget* o,void* arg=0);
/** Internal use only. */
int test_shortcut();
/** Internal use only. */
static char label_shortcut(const char *t);
/** Internal use only. */
static int test_shortcut(const char*);
/** Checks if w is a child of this widget.
\param[in] w potential child widget
\return Returns 1 if \p w is a child of this widget, or is
equal to this widget. Returns 0 if \p w is NULL.
*/
int contains(const Fl_Widget *w) const ;
/** Checks if this widget is a child of w.
Returns 1 if this widget is a child of \p w, or is
equal to \p w. Returns 0 if \p w is NULL.
\param[in] w the possible parent widget.
\see contains()
*/
int inside(const Fl_Widget* w) const {return w ? w->contains(this) : 0;}
/** Schedules the drawing of the widget.
Marks the widget as needing its draw() routine called.
*/
void redraw();
/** Schedules the drawing of the label.
Marks the widget or the parent as needing a redraw for the label area
of a widget.
*/
void redraw_label();
/** Returns non-zero if draw() needs to be called.
The damage value is actually a bit field that the widget
subclass can use to figure out what parts to draw.
\return a bitmap of flags describing the kind of damage to the widget
\see damage(uchar), clear_damage(uchar)
*/
uchar damage() const {return damage_;}
/** Clears the damage flags.
Damage flags are cleared when parts of the widget drawing is repaired.
\param[in] c bitmask of flags to clear
\see damage(uchar), damage()
*/
void clear_damage(uchar c = 0) {damage_ = c;}
/** Sets the damage bits for the widget.
Setting damage bits will schedule the widget for the next redraw.
\param[in] c bitmask of flags to set
\see damage(), clear_damage(uchar)
*/
void damage(uchar c);
/** Sets the damage bits for an area inside the widget.
Setting damage bits will schedule the widget for the next redraw.
\param[in] c bitmask of flags to set
\param[in] x, y, w, h size of damaged area
\see damage(), clear_damage(uchar)
*/
void damage(uchar c, int x, int y, int w, int h);
void draw_label(int, int, int, int, Fl_Align) const;
/** Sets width ww and height hh accordingly with the label size.
Labels with images will return w() and h() of the image.
*/
void measure_label(int& ww, int& hh) {label_.measure(ww, hh);}
/** Returns a pointer to the primary Fl_Window widget.
\retval NULL if no window is associated with this widget.
\note for an Fl_Window widget, this returns its <I>parent</I> window
(if any), not <I>this</I> window.
*/
Fl_Window* window() const ;
/** For back compatibility only.
\deprecated Use selection_color() instead.
*/
Fl_Color color2() const {return (Fl_Color)color2_;}
/** For back compatibility only.
\deprecated Use selection_color(unsigned) instead.
*/
void color2(unsigned a) {color2_ = a;}
};
/**
Reserved type numbers (necessary for my cheapo RTTI) start here.
Grep the header files for "RESERVED_TYPE" to find the next available
number.
*/
#define FL_RESERVED_TYPE 100
#endif
//
// End of "$Id$".
//
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