Fl_Widget
|
+----Fl_Box, Fl_Browser_, Fl_Button, Fl_Chart, Fl_Clock,
Fl_Free, Fl_Group, Fl_Input_, Fl_Menu_, Fl_Positioner,
Fl_Progress, Fl_Timer, Fl_Valuator
#include <FL/Fl_Widget.H>
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.
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().
Destroys the widget. Destroying single widgets is not very common, and it is your responsibility to either remove() them from any enclosing group or destroy that group immediately after destroying the children. You almost always want to destroy the parent group instead which will destroy all of the child widgets and groups in that group.
Fl_Widget::active() returns whether the widget is active. Fl_Widget::active_r() returns whether the widget and all of its parents are active. An inactive widget does not get any events, but it does get redrawn. A widget is only active if active() is true on it and all of its parents.
Changing this value will send FL_ACTIVATE or FL_DEACTIVATE to the widget if active_r() is true.
Currently you cannot deactivate Fl_Window widgets.
Gets or sets the label alignment, which 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. The value can be any of these constants bitwise-OR'd together:
Gets or sets the current user data (long) argument that is passed to the callback function.
| Note:
This is implemented by casting the long value to a void * and may not be portable on some machines. |
Gets or sets the box type for the widget, which identifies a routine that draws the background of the widget. See Box Types for the available types. The default depends on the widget, but is usually FL_NO_BOX or FL_UP_BOX.
Gets or sets the current callback function for the widget. Each widget has a single callback.
Fl_Widget::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.
Hides the widget; you must still redraw the parent to see a
change in the window. Normally you want to use the Disables keyboard focus navigation with this widget;
normally, all widgets participate in keyboard focus navigation.
Gets or 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_GRAY. See the enumeration list for
predefined colors. Use Fl::set_color() to
redefine colors.
The two color form sets both the background and selection
colors. See the description of the selection_color()
method for more information.
Returns 1 if b is a child of this widget, or is
equal to this widget. Returns 0 if b is NULL.
The first version 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.
The last two forms set the damage bits for the widget; the
last form damages the widget within the specified bounding box.
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.
Gets or sets the image to use as part of the widget label.
This image is used when drawing the widget in the inactive
state.
Causes a widget to invoke its callback function, optionally
with arbitrary arguments.
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 new widget, this function must return 0
if the widget does not use the event or 1 if it uses the
event. Gets or sets the image to use as part of the widget label.
This image is used when drawing the widget in the active state.
Returns 1 if this widget is a child of a, or is
equal to a. Returns 0 if a is NULL.
Get or set 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 not copied), so if
you need to set the label to a formatted value, make sure the
buffer is static, global, or allocated.
Gets or sets the label color. The default color is FL_BLACK.
Gets or sets the font to use. Fonts are identified by small
8-bit indexes into a table. See the enumeration list for
predefined typefaces. The default value uses a Helvetica
typeface (Arial for Microsoft® Windows®). The function
Fl::set_font() can
define new typefaces.
Gets or sets the font size in pixels. The default size is 14
pixels.
Gets or sets the labeltype which
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.
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.
Returns a pointer to the parent widget. Usually this is a Fl_Group or Fl_Window. Returns
NULL if the widget has no parent.
Marks the widget as needing its draw() routine called.
Marks the widget or the parent as needing a redraw for the
label area of a widget.
Change 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 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.
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). Gets or sets the selection color, which 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(a,b).
This is the same as (active() && !output()
&& visible()) but is faster.
Gets or sets a string of text to display in a popup tooltip
window when the user hovers the mouse over the widget. The
string is not copied, so make sure any formatted string
is stored in a static, global, or allocated buffer.
Returns the widget type value, which is used for Forms
compatability and to simulate RTTI.
Returns the position of the upper-left corner of the widget
in its enclosing Fl_Window (not its parent if that is not
an Fl_Window), and its width and height.
Gets or sets the current user data (void *) argument
that is passed to the callback function.
Returns a pointer to the primary Fl_Window widget.
Returns NULL if no window is associated with this
widget. Note: for an Fl_Window widget, this returns
its parent window (if any), not this window.
Makes the widget visible; you must still redraw the parent
widget to see a change in the window. Normally you want to use
the 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.
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
and all of its parents.
Changing it will send FL_SHOW or FL_HIDE
events to the widget. Do not change it if the parent is not
visible, as this will send false FL_SHOW or FL_HIDE
events to the widget. redraw() is called if necessary on
this or the parent.
Returns non-zero if this widget will participate in keyboard
focus navigation.
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.
hide() method instead.
void Fl_Window::clear_visible_focus();
Fl_Color Fl_Widget::color() const
void Fl_Widget::color(Fl_Color)
void Fl_Widget::color(Fl_Color, Fl_Color)int Fl_Widget::contains(Fl_Widget* b) const
uchar Fl_Widget::damage() const
void damage(uchar c);
void damage(uchar c, int X, int Y, int W, int H);static void
Fl_Widget::default_callback(Fl_Widget*, void*)
Fl_Image* Fl_Widget::deimage()
void Fl_Widget::deimage(Fl_Image* a)
void Fl_Widget::deimage(Fl_Image& a)void Fl_Widget::do_callback()
void Fl_Widget::do_callback(Fl_Widget*, void* = 0)
void Fl_Widget::do_callback(Fl_Widget*, long)virtual int Fl_Widget::handle(int event)
Fl_Image* Fl_Widget::image()
void Fl_Widget::image(Fl_Image* a)
void Fl_Widget::image(Fl_Image& a)int Fl_Widget::inside(const Fl_Widget* a)
const
const char* Fl_Widget::label() const
void Fl_Widget::label(const char*)Fl_Color Fl_Widget::labelcolor() const
void Fl_Widget::labelcolor(Fl_Color)Fl_Font Fl_Widget::labelfont() const
void Fl_Widget::labelfont(Fl_Font)uchar Fl_Widget::labelsize() const
void Fl_Widget::labelsize(uchar)void Fl_Widget::label(Fl_Labeltype,
const char*)
uchar Fl_Widget::labeltype() const
void Fl_Widget::labeltype(Fl_Labeltype)int Fl_Widget::output() const
void Fl_Widget::clear_output()
void Fl_Widget::set_output()Fl_Group *Fl_Widget::parent() const
void Fl_Widget::redraw()
void Fl_Widget::redraw_label()
virtual void
Fl_Widget::resize(int x, int y, int w, int h)
void Fl_Widget::position(short x, short y)
void Fl_Widget::size(short w, short h)Fl_Color
Fl_Widget::selection_color() const
void Fl_Widget::selection_color(Fl_Color)int Fl_Widget::takesevents() const
int Fl_Widget::take_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 an widget. Returns true if the widget
accepted the focus.
const char *Fl_Widget::tooltip()
void Fl_Widget::tooltip(const char *t)uchar Fl_Widget::type() const;
short Fl_Widget::x() const
short Fl_Widget::y() const
short Fl_Widget::w() const
short Fl_Widget::h() constvoid* Fl_Widget::user_data() const
void Fl_Widget::user_data(void*)Fl_Window* Fl_Widget::window() const;
void Fl_Widget::set_visible();
show() method
instead.
void Fl_Widget::set_visible_focus();
int Fl_Widget::visible() const
int Fl_Widget::visible_r() const
void Fl_Widget::show()
void Fl_Widget::hide()void Fl_Widget::visible_focus();
Fl_When Fl_Widget::when() const
void Fl_Widget::when(Fl_When)