Next: Button Interaction, Previous: Adding Button Objects, Up: Part III Button-like Objects [Contents][Index]
The following types of buttons are available:
FL_NORMAL_BUTTON
Returned to fl_do_forms()
(or having its callback
funtion invoked) when released.
FL_PUSH_BUTTON
Stays pushed until user pushes it again.
FL_MENU_BUTTON
Returned when pushed, useful e.g., for opening a popup when pushed.
FL_TOUCH_BUTTON
Returned at regulat intervals as long as the user pushes it.
FL_RADIO_BUTTON
Push button that switches off other radio buttons.
FL_HIDDEN_BUTTON
Invisible normal button.
FL_INOUT_BUTTON
Returned both when pushed and when released.
FL_RETURN_BUTTON
Like a normal button but also reacts to the <Return>
key.
FL_HIDDEN_RET_BUTTON
Invisible return button.
Except for the FL_HIDDEN_BUTTON
and
FL_HIDDEN_RET_BUTTON
, which are invisible, there’s not
much visible indication of the button type but the function is quite
different. For each of the types the button gets pushed down when the
user presses the mouse on top of it. What actually happens when the
user does so then depends on the type of the button. An
FL_NORMAL_BUTTON
, FL_TOUCH_BUTTON
and
FL_INOUT_BUTTON
gets released when the user releases the
mouse button. Their difference lies in the moment at which the
interaction routines return them (see below). A
FL_PUSH_BUTTON
remains pushed and is only released when
the user pushes it again. A FL_RADIO_BUTTON
is a push
button with the following extra property: whenever the user pushes a
radio button, all other pushed radio buttons in the same form (or in
the same group) are released. In this way the user can make its choice
among several possibilities. A FL_RETURN_BUTTON
behaves
like a normal button, but it also reacts when the <Return>
key
on the keyboard is pressed. When a form contains such a button (of
course there can only be one) the <Return>
key can no longer be
used to move between input fields. For this the <Tab>
key must
be used.
A FL_HIDDEN_BUTTON
behaves like a normal button but is
invisible. A FL_HIDDEN_RET_BUTTON
is like a hidden button
but also reacts to <Return>
key presses.
Next: Button Interaction, Previous: Adding Button Objects, Up: Part III Button-like Objects [Contents][Index]