+----Fl_Check_Button, Fl_Light_Button, Fl_Repeat_Button,
Fl_Return_Button, Fl_Round_Button, Fl_Toggle_Button
Buttons generate callbacks when they are clicked by the user. You
control exactly when and how by changing the values for type()
Buttons can also generate callbacks in response to FL_SHORTCUT
events. The button can either have an explicit
shortcut() value or a letter shortcut can be indicated in
the label() with an '&' character before it. For the label
shortcut it does not matter if Alt is held down, but if you have
an input field in the same window, the user will have to hold down the
Alt key so that the input field does not eat the event first as an
The constructor creates the button using the position, size, and
The destructor removes the button.
Same as value(0).
The first form returns the current down box type, which is drawn when
value() is non-zero.
The second form sets the down box type. The default value of 0
causes FLTK to figure out the correct matching down version of box()
Same as value(1).
Turns on this button and turns off all other radio buttons in the
group (calling value(1) or set() does not do this).
The first form returns the current shortcut key for the button.
The second form sets the shortcut key to key. Setting this
overrides the use of '&' in the label(). The value is a bitwise
OR of a key and a set of shift flags, for example
FL_ALT | 'a'
FL_ALT | (FL_F + 10), or just
'a'. A value
of 0 disables the shortcut.
The key can be any value returned by
Fl::event_key(), but will usually be an ASCII letter. Use
a lower-case letter unless you require the shift key to be held down.
The shift flags can be any set of values accepted by
Fl::event_state(). If the bit is on that shift key must
be pushed. Meta, Alt, Ctrl, and Shift must be off if they are not in
the shift flags (zero for the other bits indicates a "don't care"
The first form of type() returns the current button type,
which can be one of:
The second form sets the button type to t.
The first form returns the current value (0 or 1). The second form
sets the current value.
Controls when callbacks are done. The following values are useful,
the default value is
0: The value is unchanged.
FL_TOGGLE_BUTTON: The value is inverted.
FL_RADIO_BUTTON: The value is set to 1, and all other
buttons in the current group with
type() == FL_RADIO_BUTTON
are set to zero.
0: The callback is not done, instead changed() is
FL_WHEN_RELEASE: The callback is done after the user
successfully clicks the button, or when a shortcut is typed.
FL_WHEN_CHANGED : The callback is done each time the
value() changes (when the user pushes and releases the button, and as
the mouse is dragged around in and out of the button).
No comments for this page.