2001-11-29 22:24:00 +03:00
|
|
|
<HTML>
|
|
|
|
|
<BODY>
|
|
|
|
|
|
|
|
|
|
<H1 ALIGN="RIGHT"><A NAME="events">6 - Handling Events</A></H1>
|
|
|
|
|
|
|
|
|
|
<P>This chapter discusses the FLTK event model and how to handle
|
|
|
|
|
events in your program or widget.
|
|
|
|
|
|
1998-12-29 17:21:17 +03:00
|
|
|
<H2>The FLTK Event Model</H2>
|
2000-04-28 22:15:26 +04:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<P>Every time a user moves the mouse pointer, clicks a button,
|
|
|
|
|
or presses a key, an event is generated and sent to your
|
|
|
|
|
application. Events can also come from other programs like the
|
|
|
|
|
window manager.
|
2000-04-28 22:15:26 +04:00
|
|
|
|
|
|
|
|
<P>Events are identified by the integer argument passed to the
|
2001-11-29 22:24:00 +03:00
|
|
|
<A href="subclassing.html#handle"><TT>Fl_Widget::handle()</TT></A> virtual
|
|
|
|
|
method. Other information about the most recent event is stored in
|
2000-04-28 22:15:26 +04:00
|
|
|
static locations and acquired by calling the <A
|
2001-11-29 22:24:00 +03:00
|
|
|
href="#event_xxx"><TT>Fl::event_*()</TT></A> methods. This static
|
|
|
|
|
information remains valid until the next event is read from the window
|
|
|
|
|
system, so it is ok to look at it outside of the <TT>handle()</TT>
|
|
|
|
|
method.
|
2000-04-28 22:15:26 +04:00
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<H2>Mouse Events</H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_PUSH</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>A mouse button has gone down with the mouse pointing at this
|
|
|
|
|
widget. You can find out what button by calling <A
|
|
|
|
|
href="Fl.html#Fl.event_button"><TT>
|
|
|
|
|
Fl::event_button()</TT></A>. You find out the mouse position by
|
|
|
|
|
calling <A
|
|
|
|
|
href="Fl.html#Fl.event_x"><TT>Fl::event_x()</TT></A> and <A
|
|
|
|
|
href="Fl.html#Fl.event_y"> <TT>Fl::event_y()</TT></A>.
|
|
|
|
|
|
|
|
|
|
<P>A widget indicates that it "wants" the mouse click
|
|
|
|
|
by returning non-zero from its <A
|
|
|
|
|
href="subclassing.html#handle"><TT>handle()</TT></A> method. It
|
|
|
|
|
will then become the <A href="Fl.html#Fl.pushed"><TT>
|
|
|
|
|
Fl::pushed()</TT></A> widget and will get <TT>FL_DRAG</TT> and
|
|
|
|
|
the matching <TT>FL_RELEASE</TT> events. If <TT>handle()</TT>
|
|
|
|
|
returns zero then FLTK will try sending the <TT>FL_PUSH</TT> to
|
|
|
|
|
another widget. </P>
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_DRAG</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>The mouse has moved with a button held down. The current
|
|
|
|
|
button state is in <a
|
|
|
|
|
href="Fl.html#Fl.event_state"><tt>Fl::event_state()</tt></a>.
|
|
|
|
|
The mouse position is in <a
|
|
|
|
|
href="Fl.html#Fl.event_x"><tt>Fl::event_x()</tt></a> and <a
|
|
|
|
|
href="Fl.html#Fl.event_y"><tt>Fl::event_y()</tt></a>.
|
1999-06-12 17:53:34 +04:00
|
|
|
|
|
|
|
|
<P>To receive <CODE>FL_DRAG</CODE> events you must also respond to the
|
|
|
|
|
<CODE>FL_PUSH</CODE> and <CODE>FL_RELEASE</CODE> events.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_RELEASE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>A mouse button has been released. You can find out what
|
|
|
|
|
button by calling <A
|
|
|
|
|
href="Fl.html#Fl.event_button"><TT>Fl::event_button()</TT></A>.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_MOVE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>The mouse has moved without any mouse buttons held down.
|
|
|
|
|
This event is sent to the <A
|
|
|
|
|
href="Fl.html#Fl.belowmouse"><TT>Fl::belowmouse()</TT></A>
|
1999-01-27 00:36:02 +03:00
|
|
|
widget.
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<H3>FL_MOUSEWHEEL</H3>
|
|
|
|
|
|
|
|
|
|
<P>The user has moved the mouse wheel. The <A
|
|
|
|
|
HREF="Fl.html#Fl.event_dx"><TT>Fl::event_dx()</TT></A> and <A
|
|
|
|
|
HREF="Fl.html#Fl.event_dy"><TT>Fl::event_dy()</TT></A> methods
|
|
|
|
|
can be used to find the amount to scroll horizontally and
|
|
|
|
|
vertically.
|
|
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<H2>Focus Events</H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_ENTER</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>The mouse has been moved to point at this widget. This can
|
|
|
|
|
be used for highlighting feedback. If a widget wants to
|
|
|
|
|
highlight or otherwise track the mouse, it indicates this by
|
|
|
|
|
returning non-zero from its <A
|
|
|
|
|
href="Fl.html#Fl.handle"><TT>handle()</TT></A> method. It then
|
|
|
|
|
becomes the <A
|
|
|
|
|
href="Fl.html#Fl.belowmouse"><TT>Fl::belowmouse()</TT></A>
|
|
|
|
|
widget and will receive <TT>FL_MOVE</TT> and <TT>FL_LEAVE</TT>
|
|
|
|
|
events.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_LEAVE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>The mouse has moved out of the widget.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_FOCUS</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>This indicates an <I>attempt</I> to give a widget the
|
|
|
|
|
keyboard focus.
|
|
|
|
|
|
|
|
|
|
<P>If a widget wants the focus, it should change itself to
|
|
|
|
|
display the fact that it has the focus, and return non-zero from
|
|
|
|
|
its <A
|
|
|
|
|
href="Fl_Widget.html#Fl_Widget.handle"><TT>handle()</TT></A>
|
|
|
|
|
method. It then becomes the <A
|
|
|
|
|
href="Fl.html#Fl.focus"><TT>Fl::focus()</TT></A> widget and gets
|
|
|
|
|
<TT>FL_KEYDOWN</TT>, <TT>FL_KEYUP</TT>, and <TT>FL_UNFOCUS</TT>
|
|
|
|
|
events.
|
|
|
|
|
|
|
|
|
|
<P>The focus will change either because the window manager
|
|
|
|
|
changed which window gets the focus, or because the user tried
|
|
|
|
|
to navigate using tab, arrows, or other keys. You can check <A
|
|
|
|
|
href="Fl.html#Fl.event_key"><TT>Fl::event_key()</TT></A> to
|
|
|
|
|
figure out why it moved. For navigation it will be the key
|
|
|
|
|
pressed and interaction with the window manager it will be
|
|
|
|
|
zero.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_UNFOCUS</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>This event is sent to the previous <A
|
|
|
|
|
href="Fl.html#Fl.focus"><TT>Fl::focus()</TT></A> widget when
|
|
|
|
|
another widget gets the focus or the window loses focus.
|
|
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<H2>Keyboard Events</H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<H3>FL_KEYDOWN, FL_KEYUP</H3>
|
|
|
|
|
|
|
|
|
|
<P>A key was pressed or released. The key can be found in <A
|
|
|
|
|
href="Fl.html#Fl.event_key"><TT>Fl::event_key()</TT></A>. The
|
|
|
|
|
text that the key should insert can be found with <A
|
|
|
|
|
href="Fl.html#Fl.event_text"><TT>Fl::event_text()</TT></A> and
|
|
|
|
|
its length is in <A
|
|
|
|
|
href="Fl.html#Fl.event_length"><TT>Fl::event_length()</TT></A>.
|
|
|
|
|
If you use the key <TT>handle()</TT> should return 1. If you
|
|
|
|
|
return zero then FLTK assumes you ignored the key and will
|
|
|
|
|
then attempt to send it to a parent widget. If none of them want
|
|
|
|
|
it, it will change the event into a <TT>FL_SHORTCUT</TT> event.
|
|
|
|
|
|
|
|
|
|
<P>To receive <CODE>FL_KEYBOARD</CODE> events you must also
|
|
|
|
|
respond to the <CODE>FL_FOCUS</CODE> and <CODE>FL_UNFOCUS</CODE>
|
|
|
|
|
events.
|
|
|
|
|
|
|
|
|
|
<P>If you are writing a text-editing widget you may also want to
|
|
|
|
|
call the <a href="Fl.html#Fl.compose"><TT>Fl::compose()</TT></a>
|
|
|
|
|
function to translate individual keystrokes into foreign
|
|
|
|
|
characters.
|
2000-02-21 13:45:59 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_SHORTCUT</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>If the <A href="Fl.html#Fl.focus"><TT>Fl::focus()</TT></A>
|
|
|
|
|
widget is zero or ignores an <TT>FL_KEYBOARD</TT> event then
|
|
|
|
|
FLTK tries sending this event to every widget it can, until one
|
|
|
|
|
of them returns non-zero. <TT>FL_SHORTCUT</TT> is first sent to
|
|
|
|
|
the <TT>Fl::belowmouse()</TT> widget, then its parents and
|
|
|
|
|
siblings, and eventually to every widget in the window, trying
|
|
|
|
|
to find an object that returns non-zero. FLTK tries really hard
|
|
|
|
|
to not to ignore any keystrokes!
|
|
|
|
|
|
|
|
|
|
<P>You can also make "global" shortcuts by using <A
|
|
|
|
|
href="Fl.html#Fl.add_handler"><TT>Fl::add_handler()</TT></A>. A
|
|
|
|
|
global shortcut will work no matter what windows are displayed
|
|
|
|
|
or which one has the focus.</P>
|
|
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<H2>Widget Events</H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_DEACTIVATE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>This widget is no longer active, due to <A
|
|
|
|
|
href="Fl_Widget.html#Fl_Widget.deactivate"><TT>deactivate()</TT></A>
|
|
|
|
|
being called on it or one of its parents. <TT> active()</TT> may
|
|
|
|
|
still be true after this, the widget is only active if
|
|
|
|
|
<TT>active()</TT> is true on it and all its parents (use <TT>active_r()</TT> to check this).
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_ACTIVATE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>This widget is now active, due to <A
|
|
|
|
|
href="Fl_Widget.html#Fl_Widget.activate"><TT>activate()</TT></A>
|
|
|
|
|
being called on it or one of its parents.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_HIDE</H3>
|
2000-02-21 13:45:59 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<P>This widget is no longer visible, due to <A
|
|
|
|
|
href="Fl_Widget.html#Fl_Widget.hide"><tt>hide()</tt></a> being
|
|
|
|
|
called on it or one of its parents, or due to a parent window
|
|
|
|
|
being minimized. <tt>visible()</tt> may still be true after
|
|
|
|
|
this, but the widget is visible only if <tt>visible()</tt> is
|
|
|
|
|
true for it and all its parents (use <tt>visible_r()</tt> to
|
|
|
|
|
check this).
|
1998-12-29 17:21:17 +03:00
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<h3>FL_SHOW</h3>
|
1998-12-29 17:21:17 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<P>This widget is visible again, due to <a
|
|
|
|
|
href="Fl_Widget.html#Fl_Widget.show"><TT>show()</TT></A> being
|
|
|
|
|
called on it or one of its parents, or due to a parent window
|
|
|
|
|
being restored. <I>Child <TT>Fl_Window</TT>s respond to this by
|
|
|
|
|
actually creating the window if not done already, so if you
|
|
|
|
|
subclass a window, be sure to pass <TT>FL_SHOW</TT> to the base
|
|
|
|
|
class <TT>handle()</TT> method!</I>
|
|
|
|
|
|
1999-01-07 19:36:11 +03:00
|
|
|
<H2>Clipboard Events</H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_PASTE</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>You should get this event some time after you call <A
|
|
|
|
|
href="Fl.html#Fl.paste"><TT>Fl::paste()</TT></A>. The contents
|
|
|
|
|
of <A href="Fl.html#Fl.event_text"><TT>Fl::event_text()</TT></A>
|
|
|
|
|
is the text to insert and the number of characters is in <A
|
|
|
|
|
href="Fl.html#Fl.event_length"><TT>Fl::event_length()</TT></A>.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H3>FL_SELECTIONCLEAR</H3>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>The <A
|
|
|
|
|
href="Fl.html#Fl.selection_owner"><TT>Fl::selection_owner()</TT></A>
|
|
|
|
|
will get this event before the selection is moved to another
|
|
|
|
|
widget. This indicates that some other widget or program has
|
|
|
|
|
claimed the selection. Motif programs used this to clear the
|
|
|
|
|
selection indication. Most modern programs ignore this.
|
|
|
|
|
|
2002-02-25 00:09:51 +03:00
|
|
|
<H2><A NAME="dnd">Drag And Drop Events</A></H2>
|
|
|
|
|
|
|
|
|
|
<H3>FL_DND_ENTER</H3>
|
|
|
|
|
|
|
|
|
|
<P>The mouse has been moved to point at this widget. A widget
|
|
|
|
|
that is interested in receiving drag'n'drop data must return 1
|
|
|
|
|
to receive FL_DND_DRAG, FL_DND_LEAVE and FL_DND_RELEASE events.
|
|
|
|
|
|
|
|
|
|
<H3>FL_DND_DRAG</H3>
|
|
|
|
|
|
|
|
|
|
<P>The mouse has been moved inside a widget while dragging data.
|
|
|
|
|
A widget that is interested in receiving drag'n'drop data should
|
|
|
|
|
indicate the possible drop position.
|
|
|
|
|
|
|
|
|
|
<H3>FL_DND_LEAVE</H3>
|
|
|
|
|
|
|
|
|
|
<P>The mouse has moved out of the widget.
|
|
|
|
|
|
|
|
|
|
<H3>FL_DND_RELEASE</H3>
|
|
|
|
|
|
|
|
|
|
<P>The user has released the mouse button dropping data into
|
|
|
|
|
the widget. If the widget returns 1, it will receive the data in
|
|
|
|
|
the immediatly following FL_PASTE event.
|
|
|
|
|
|
2002-10-04 21:23:09 +04:00
|
|
|
<!-- NEED 6in -->
|
|
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<H2><A name="event_xxx">Fl::event_*() methods</A></H2>
|
|
|
|
|
|
|
|
|
|
<P>FLTK keeps the information about the most recent event in
|
|
|
|
|
static storage. This information is good until the next event is
|
|
|
|
|
processed. Thus it is valid inside <TT>handle()</TT> and
|
|
|
|
|
<TT>callback()</TT> methods.
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<P>These are all trivial inline functions and thus very fast and small: </P>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<UL>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_button"><TT>Fl::event_button</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_clicks"><TT>Fl::event_clicks</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_dx"><TT>Fl::event_dx</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_dy"><TT>Fl::event_dy</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_inside"><TT>Fl::event_inside</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_is_click"><TT>Fl::event_is_click</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_key"><TT>Fl::event_key</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_length"><TT>Fl::event_length</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_state"><TT>Fl::event_state</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_text"><TT>Fl::event_text</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_x"><TT>Fl::event_x</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_x_root"><TT>Fl::event_x_root</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_y"><TT>Fl::event_y</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.event_y_root"><TT>Fl::event_y_root</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.get_key"><TT>Fl::get_key</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.get_mouse"><TT>Fl::get_mouse</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.test_shortcut"><TT>Fl::test_shortcut</TT></A></LI>
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
</UL>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<H2><A name=propagation>Event Propagation</A></H2>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<P>FLTK follows very simple and unchangeable rules for sending
|
|
|
|
|
events. The major innovation is that widgets can indicate (by
|
|
|
|
|
returning 0 from the <TT>handle()</TT> method) that they are not
|
|
|
|
|
interested in an event, and FLTK can then send that event
|
|
|
|
|
elsewhere. This eliminates the need for "interests"
|
|
|
|
|
(event masks or tables), and this is probably the main reason
|
|
|
|
|
FLTK is much smaller than other toolkits.
|
|
|
|
|
|
|
|
|
|
<P>Most events are sent directly to the <TT>handle()</TT> method
|
|
|
|
|
of the <TT>Fl_Window</TT> that the window system says they
|
|
|
|
|
belong to. The window (actually the <TT>Fl_Group</TT> that
|
|
|
|
|
<TT>Fl_Window</TT> is a subclass of) is responsible for sending
|
|
|
|
|
the events on to any child widgets. To make the
|
|
|
|
|
<TT>Fl_Group</TT> code somewhat easier, FLTK sends some events
|
|
|
|
|
(<TT>FL_DRAG</TT>, <TT>FL_RELEASE</TT>, <TT>FL_KEYBOARD</TT>,
|
|
|
|
|
<TT>FL_SHORTCUT</TT>, <TT>FL_UNFOCUS</TT>, and
|
|
|
|
|
<TT>FL_LEAVE</TT>) directly to leaf widgets. These procedures
|
|
|
|
|
control those leaf widgets:
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
<UL>
|
2001-11-29 22:24:00 +03:00
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.add_handler"><TT>Fl::add_handler</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.belowmouse"><TT>Fl::belowmouse</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.focus"><TT>Fl::focus</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.grab"><TT>Fl::grab</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.modal"><TT>Fl::modal</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.pushed"><TT>Fl::pushed</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl.html#Fl.release"><TT>Fl::release</TT></A></LI>
|
|
|
|
|
|
|
|
|
|
<LI><A HREF="Fl_Widget.html#Fl_Widget.take_focus"><TT>Fl_Widget::take_focus</TT></A></LI>
|
|
|
|
|
|
1999-01-13 22:28:54 +03:00
|
|
|
</UL>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<H2><A name="compose">FLTK Compose-Character Sequences</A></H2>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<P>The foreign-letter compose processing done by the <A
|
|
|
|
|
href="Fl_Input.html#compose"><tt>Fl_Input</tt></a> widget is provided in
|
2000-02-21 13:45:59 +03:00
|
|
|
a function that you can call if you are writing your own text editor
|
|
|
|
|
widget.
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<p>FLTK uses its own compose processing to allow "preview" of
|
|
|
|
|
the partially composed sequence, which is impossible with the
|
|
|
|
|
usual "dead key" processing.
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<p>Although currently only characters in the ISO-8859-1
|
|
|
|
|
character set are handled, you should call this in case any
|
|
|
|
|
enhancements to the processing are done in the future. The
|
|
|
|
|
interface has been designed to handle arbitrary UTF-8 encoded
|
|
|
|
|
text.
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<P>The following methods are provided for character composition:
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<UL>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<LI><A HREF="Fl.html#Fl.compose"><TT>Fl::compose()</TT></A></LI>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
<LI><A HREF="Fl.html#Fl.compose_reset"><TT>Fl::compose_reset()</TT></A></LI>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
</UL>
|
1999-01-19 23:53:39 +03:00
|
|
|
|
2001-11-29 22:24:00 +03:00
|
|
|
</BODY>
|
|
|
|
|
</HTML>
|
