2ba819c6e7
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2681 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
1235 lines
48 KiB
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1235 lines
48 KiB
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<H2><A name="Fl">class Fl</A></H2>
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<HR>
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<H3>Class Hierarchy</H3>
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<UL><PRE>
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<B>Fl</B>
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</PRE></UL>
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<H3>Include Files</H3>
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<UL><PRE>
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#include <FL/Fl.H>
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</PRE></UL>
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<H3>Description</H3>
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<P>The <TT>Fl</TT> class is the FLTK global (static) class containing
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state information and global methods for the current application.</P>
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<H3>Methods</H3>
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<UL>
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<LI><A HREF="#Fl.add_check">add_check</A></LI>
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<LI><A HREF="#Fl.add_fd">add_fd</A></LI>
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<LI><A HREF="#Fl.add_handler">add_handler</A></LI>
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<LI><A HREF="#Fl.add_idle">add_idle</A></LI>
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<LI><A HREF="#Fl.add_timeout">add_timeout</A></LI>
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<LI><A HREF="#Fl.arg">arg</A></LI>
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<LI><A HREF="#Fl.args">args</A></LI>
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<LI><A HREF="#Fl.atclose">atclose</A></LI>
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<LI><A HREF="#Fl.awake">awake</A></LI>
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<LI><A HREF="#Fl.background">background</A></LI>
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<LI><A HREF="#Fl.background2">background2</A></LI>
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<LI><A HREF="#Fl.belowmouse">belowmouse</A></LI>
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<LI><A HREF="#Fl.box_dh">box_dh</A></LI>
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<LI><A HREF="#Fl.box_dw">box_dw</A></LI>
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<LI><A HREF="#Fl.box_dx">box_dx</A></LI>
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<LI><A HREF="#Fl.box_dy">box_dy</A></LI>
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<LI><A HREF="#Fl.check">check</A></LI>
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<LI><A HREF="#Fl.compose">compose</A></LI>
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<LI><A HREF="#Fl.compose_reset">compose_reset</A></LI>
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<LI><A HREF="#Fl.copy">copy</A></LI>
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<LI><A HREF="#Fl.damage">damage</A></LI>
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<LI><A HREF="#Fl.default_atclose">default_atclose</A></LI>
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<LI><A HREF="#Fl.display">display</A></LI>
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<LI><A HREF="#Fl.dnd">dnd</A></LI>
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<LI><A HREF="#Fl.dnd_text_ops">dnd_text_ops</A></LI>
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<LI><A HREF="#Fl.error">error</A></LI>
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<LI><A HREF="#Fl.event">event</A></LI>
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<LI><A HREF="#Fl.event_alt">event_alt</A></LI>
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<LI><A HREF="#Fl.event_button1">event_button1</A></LI>
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<LI><A HREF="#Fl.event_button2">event_button2</A></LI>
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<LI><A HREF="#Fl.event_button3">event_button3</A></LI>
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<LI><A HREF="#Fl.event_button">event_button</A></LI>
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<LI><A HREF="#Fl.event_buttons">event_buttons</A></LI>
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<LI><A HREF="#Fl.event_clicks">event_clicks</A></LI>
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<LI><A HREF="#Fl.event_ctrl">event_ctrl</A></LI>
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<LI><A HREF="#Fl.event_dx">event_dx</A></LI>
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<LI><A HREF="#Fl.event_dy">event_dx</A></LI>
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<LI><A HREF="#Fl.event_inside">event_inside</A></LI>
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<LI><A HREF="#Fl.event_is_click">event_is_click</A></LI>
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<LI><A HREF="#Fl.event_key">event_key</A></LI>
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<LI><A HREF="#Fl.event_length">event_length</A></LI>
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<LI><A HREF="#Fl.event_shift">event_shift</A></LI>
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<LI><A HREF="#Fl.event_state">event_state</A></LI>
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<LI><A HREF="#Fl.event_text">event_text</A></LI>
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<LI><A HREF="#Fl.event_x">event_x</A></LI>
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<LI><A HREF="#Fl.event_x_root">event_x_root</A></LI>
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<LI><A HREF="#Fl.event_y">event_y</A></LI>
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<LI><A HREF="#Fl.event_y_root">event_y_root</A></LI>
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<LI><A HREF="#Fl.fatal">fatal</A></LI>
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<LI><A HREF="#Fl.first_window">first_window</A></LI>
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<LI><A HREF="#Fl.flush">flush</A></LI>
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<LI><A HREF="#Fl.focus">focus</A></LI>
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<LI><A HREF="#Fl.foreground">foreground</A></LI>
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<LI><A HREF="#Fl.free_color">free_color</A></LI>
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<LI><A HREF="#Fl.get_boxtype">get_boxtype</A></LI>
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<LI><A HREF="#Fl.get_color">get_color</A></LI>
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<LI><A HREF="#Fl.get_font">get_font</A></LI>
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<LI><A HREF="#Fl.get_font_name">get_font_name</A></LI>
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<LI><A HREF="#Fl.get_font_sizes">get_font_sizes</A></LI>
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<LI><A HREF="#Fl.get_key">get_key</A></LI>
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<LI><A HREF="#Fl.get_mouse">get_mouse</A></LI>
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<LI><A HREF="#Fl.get_system_colors">get_system_colors</A></LI>
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<LI><A HREF="#Fl.gl_visual">gl_visual</A></LI>
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<LI><A HREF="#Fl.grab">grab</A></LI>
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<LI><A HREF="#Fl.h">h</A></LI>
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<LI><A HREF="#Fl.handle">handle</A></LI>
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<LI><A HREF="#Fl.has_check">has_check</A></LI>
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<LI><A HREF="#Fl.has_idle">has_idle</A></LI>
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<LI><A HREF="#Fl.has_timeout">has_timeout</A></LI>
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<LI><A HREF="#Fl.lock">lock</A></LI>
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<LI><A HREF="#Fl.modal">modal</A></LI>
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<LI><A HREF="#Fl.next_window">next_window</A></LI>
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<LI><A HREF="#Fl.own_colormap">own_colormap</A></LI>
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<LI><A HREF="#Fl.paste">paste</A></LI>
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<LI><A HREF="#Fl.pushed">pushed</A></LI>
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<LI><A HREF="#Fl.readqueue">readqueue</A></LI>
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<LI><A HREF="#Fl.ready">ready</A></LI>
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<LI><A HREF="#Fl.redraw">redraw</A></LI>
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<LI><A HREF="#Fl.release">release</A></LI>
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<LI><A HREF="#Fl.remove_check">remove_check</A></LI>
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<LI><A HREF="#Fl.remove_fd">remove_fd</A></LI>
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<LI><A HREF="#Fl.remove_handler">remove_handler</A></LI>
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<LI><A HREF="#Fl.remove_idle">remove_idle</A></LI>
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<LI><A HREF="#Fl.remove_timeout">remove_timeout</A></LI>
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<LI><A HREF="#Fl.repeat_timeout">repeat_timeout</A></LI>
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<LI><A HREF="#Fl.run">run</A></LI>
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<LI><A HREF="#Fl.scheme">scheme</A></LI>
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<LI><A HREF="#Fl.selection">selection</A></LI>
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<LI><A HREF="#Fl.selection_owner">selection_owner</A></LI>
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<LI><A HREF="#Fl.set_abort">set_abort</A></LI>
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<LI><A HREF="#Fl.set_atclose">set_atclose</A></LI>
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<LI><A HREF="#Fl.set_boxtype">set_boxtype</A></LI>
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<LI><A HREF="#Fl.set_color">set_color</A></LI>
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<LI><A HREF="#Fl.set_font">set_font</A></LI>
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<LI><A HREF="#Fl.set_fonts">set_fonts</A></LI>
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<LI><A HREF="#Fl.set_idle">set_idle</A></LI>
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<LI><A HREF="#Fl.set_labeltype">set_labeltype</A></LI>
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<LI><A HREF="#Fl.test_shortcut">test_shortcut</A></LI>
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<LI><A HREF="#Fl.thread_message">thread_message</A></LI>
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<LI><A HREF="#Fl.unlock">unlock</A></LI>
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<LI><A HREF="#Fl.version">version</A></LI>
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<LI><A HREF="#Fl.visible_focus">visible_focus</A></LI>
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<LI><A HREF="#Fl.visual">visual</A></LI>
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<LI><A HREF="#Fl.wait">wait</A></LI>
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<LI><A HREF="#Fl.warning">warning</A></LI>
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<LI><A HREF="#Fl.w">w</A></LI>
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<LI><A HREF="#Fl.x">x</A></LI>
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<LI><A HREF="#Fl.y">y</A></LI>
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</UL>
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<H4><A NAME="Fl.add_check">void add_check(Fl_Timeout_Handler, void* = 0);</A></H4>
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<P>FLTK will call this callback just before it flushes the display and
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waits for events. This is different than an idle callback because it
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is only called once, then FLTK calls the system and tells it not to
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return until an event happens.
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<p>This can be used by code that wants to monitor the
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application's state, such as to keep a display up to date. The
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advantage of using a check callback is that it is called only when no
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events are pending. If events are coming in quickly, whole blocks of
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them will be processed before this is called once. This can save
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significant time and avoid the application falling behind the events.
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<p>Sample code:
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<UL><PRE>
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bool state_changed; // anything that changes the display turns this on
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void callback(void*) {
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if (!state_changed) return;
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state_changed = false;
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do_expensive_calculation();
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widget->redraw();
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}
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main() {
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Fl::add_check(callback);
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return Fl::run();
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}
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</PRE></UL>
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<H4><A NAME="Fl.add_fd">void add_fd(int fd, int when, void (*cb)(int,void*),void* =0);<BR>
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void add_fd(int fd, void (*cb)(int, void*), void* = 0);</A></H4>
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<P>Add file descriptor <tt>fd</tt> to listen to. When the <tt>fd</tt>
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becomes ready for reading <tt>Fl::wait()</tt> will call the callback
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and then return. The callback is
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passed the <tt>fd</tt> and the arbitrary <tt>void*</tt> argument.</P>
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<P>The second version takes a <tt>when</tt> bitfield, with the bits
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<tt>FL_READ</tt>, <tt>FL_WRITE</tt>, and <tt>FL_EXCEPT</tt> defined,
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to indicate when the callback should be done.
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<P>There can only be one callback of each type for a file descriptor. <tt>
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Fl::remove_fd()</tt> gets rid of <I>all</I> the callbacks for a given
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file descriptor.
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<P>Under UNIX <I>any</I> file descriptor can be monitored (files,
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devices, pipes, sockets, etc.) Due to limitations in Microsoft Windows,
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WIN32 applications can only monitor sockets.
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<H4><A NAME="Fl.add_handler">void add_handler(int (*h)(int));</A></H4>
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<P>Install a function to parse unrecognized events. If FLTK cannot
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figure out what to do with an event, it calls each of these functions
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(most recent first) until one of them returns non-zero. If none of
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them returns non zero then the event is ignored. Events that cause
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this to be called are:
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<UL>
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<LI><tt>FL_SHORTCUT</tt> events that are not recognized by any widget.
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This lets you provide global shortcut keys. </LI>
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<LI>System events that FLTK does not recognize. See <A href=osissues.html#fl_xevent>
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<tt>fl_xevent</tt></A>. </LI>
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<LI><I>Some</I> other events when the widget FLTK selected returns
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zero from its <tt>handle()</tt> method. Exactly which ones may change
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in future versions, however. </LI>
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</UL>
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<H4><A NAME="Fl.add_idle">void add_idle(void (*cb)(void*), void* = 0);</A></H4>
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<P>Adds a callback function that is called every time by
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<tt>Fl::wait()</tt> and also makes it act as though the timeout is
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zero (this makes <tt>Fl::wait()</tt> return immediately, so if it is
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in a loop it is called repeatedly, and thus the idle fucntion is
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called repeatedly). The idle function can be used to get background
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processing done.
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<P>You can have multiple idle callbacks. To remove an idle callback use <A
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href="#Fl.remove_idle"><tt>Fl::remove_idle()</tt></A>.
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<P><tt>Fl::wait()</tt> and <tt>Fl::check()</tt> call idle callbacks,
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but <tt>Fl::ready()</tt> does not.
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<P>The idle callback can call any FLTK functions, including
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<tt>Fl::wait()</tt>, <tt>Fl::check()</tt>, and <tt>Fl::ready()</tt>.
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FLTK will not recursively call the idle callback.
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<H4><A NAME="Fl.add_timeout">void add_timeout(double t, Fl_Timeout_Handler,void* = 0);</A></H4>
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<P>Add a one-shot timeout callback. The function will be called by
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<tt>Fl::wait()</tt> at <i>t</i> seconds after this function is called.
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The optional <tt>void*</tt> argument is passed to the callback.
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<H4><A NAME="Fl.arg">int arg(int, char**, int&);</A></H4>
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<P>Consume a single switch from <tt>argv</tt>, starting at word i.
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Returns the number of words eaten (1 or 2, or 0 if it is not
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recognized) and adds the same value to <tt>i</tt>. You can use this
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function if you prefer to control the incrementing through the
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arguments yourself.
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<H4><A NAME="Fl.args">int args(int, char**, int&, int (*)(int,char**,int&) = 0);</A></H4>
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<P>FLTK provides an <I>entirely optional</I> command-line switch parser.
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You don't have to call it if you don't like them! Everything it can do
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can be done with other calls to FLTK.
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<P>To use the switch parser, call <tt>Fl::args(...)</tt> near the start
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of your program. This does <I>not</I> open the display, instead
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switches that need the display open are stashed into static variables.
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Then you <I>must</I> display your first window by calling <A href=Fl_Window.html#Fl_Window.show>
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window->show(argc,argv)</A>, which will do anything stored in the
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static variables.
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<P><tt>callback</tt> lets you define your own switches. It is called
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with the same <tt>argc</tt> and <tt>argv</tt>, and with <tt>i</tt> the
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index of each word. The callback should return zero if the switch is
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unrecognized, and not change <tt>i</tt>. It should return non-zero if
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the switch is recognized, and add at least 1 to <tt>i</tt> (it can add
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more to consume words after the switch). This function is called
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<i>before</i> any other tests, so <i>you can override any FLTK
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switch</i> (this is why FLTK can use very short switches instead of
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the long ones all other toolkits force you to use).
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<P>On return <tt>i</tt> is set to the index of the first non-switch.
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This is either:
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<UL>
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<LI>The first word that does not start with '-'. </LI>
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<LI>The word '-' (used by many programs to name stdin as a file) </LI>
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<LI>The first unrecognized switch (return value is 0). </LI>
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<LI><tt>argc</tt></LI>
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</UL>
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<P>The return value is <tt>i</tt> unless an unrecognized switch is found,
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in which case it is zero. If your program takes no arguments other
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than switches you should produce an error if the return value is less
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than <tt>argc</tt>.
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<P>All switches except -bg2 may be abbreviated one letter and case is ignored:
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<UL>
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<LI><TT>-bg color</TT> or <TT>-background color</TT>
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<P>Sets the background color using <A
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HREF="#Fl.background"><TT>Fl::background()</TT></A>.</LI>
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<LI><TT>-bg2 color</TT> or <TT>-background2 color</TT>
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<P>Sets the secondary background color using <A
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HREF="#Fl.background2"><TT>Fl::background2()</TT></A>.</LI>
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<LI><TT>-display host:n.n</TT>
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<P>Sets the X display to use; this option is silently
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ignored under WIN32 and MacOS.</LI>
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<LI><TT>-dnd</TT> and <TT>-nodnd</TT>
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<P>Enables or disables drag and drop text operations
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using <A
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HREF="#Fl.dnd_text_ops"><TT>Fl::dnd_text_ops()</TT></A>.</LI>
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<LI><TT>-fg color</TT> or <TT>-foreground color</TT>
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<P>Sets the foreground color using <A
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HREF="#Fl.foreground"><TT>Fl::foreground()</TT></A>.</LI>
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<LI><TT>-geometry WxH+X+Y</TT>
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<P>Sets the initial window position and size according
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the the standard X geometry string.</LI>
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<LI><TT>-iconic</TT>
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<P>Iconifies the window using <A
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HREF="Fl_Window.html#Fl_Window.iconize"><TT>Fl_Window::iconize()</TT></A>.</LI>
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<LI><TT>-kbd</TT> and <TT>-nokbd</TT>
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<P>Enables or disables visible keyboard focus for
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non-text widgets using <A
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HREF="#Fl.visible_focus"><TT>Fl::visible_focus()</TT></A>.</LI>
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<LI><TT>-name string</TT>
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<P>Sets the window class using <A
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HREF="Fl_Window.html#Fl_Window.xclass"><TT>Fl_Window::xclass()</TT></A>.</LI>
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<LI><TT>-scheme string</TT>
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<P>Sets the widget scheme using <A
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HREF="#Fl.scheme"><TT>Fl::scheme()</TT></A>.</LI>
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<LI><TT>-title string</TT>
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<P>Sets the window title using <A
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HREF="Fl_Window.html#Fl_Window.label"><TT>Fl_Window::label()</TT></A>.</LI>
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<LI><TT>-tooltips</TT> and <TT>-notooltips</TT>
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<P>Enables or disables tooltips using <A
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HREF="Fl_Tooltip.html#Fl_Tooltip.enable"><TT>Fl_Tooltip::enable()</TT></A>.</LI>
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</UL>
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<P>The second form of <tt>Fl::args()</tt> is useful if your program does
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not have command line switches of its own. It parses all the switches,
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and if any are not recognized it calls <tt>Fl::abort(Fl::help)</tt>.
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<P>A usage string is displayed if <tt>Fl::args()</tt> detects an invalid
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argument on the command-line. You can change the message by setting the
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<TT>Fl::help</TT> pointer.
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<H4><A NAME="Fl.atclose">void (*atclose)(Fl_Window*,void*);</A></H4>
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<H4><A NAME="Fl.awake">void awake(void *p);</A></H4>
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<P>The <TT>awake()</TT> method sends a message pointer to the
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main thread, causing any pending <TT>wait()</TT> call to
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terminate so that the main thread can retrieve the message and
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any pending redraws can be processed.
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<H4><A NAME="Fl.background2">void background2(uchar, uchar, uchar);</A></H4>
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<P>Changes <tt>fl_color(FL_WHITE)</tt> and the same colors as <tt>
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Fl::foreground()</tt>. This color is used as a background by <tt>
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Fl_Input</tt> and other text widgets.
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<H4><A NAME="Fl.background">void background(uchar, uchar, uchar);</A></H4>
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<P>Changes <tt>fl_color(FL_GRAY)</tt> to the given color, and changes the
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gray ramp from 32 to 56 to black to white. These are the colors used
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as backgrounds by almost all widgets and used to draw the edges of all
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the boxtypes.
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<H4><A NAME="Fl.belowmouse">Fl_Widget* belowmouse();<BR>
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void belowmouse(Fl_Widget*);</A></H4>
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<P>Get or set the widget that is below the mouse. This is for
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highlighting buttons. It is not used to send <tt>FL_PUSH</tt> or <tt>
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FL_MOVE</tt> directly, for several obscure reasons, but those events
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typically go to this widget. This is also the first widget tried for <tt>
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FL_SHORTCUT</tt> events.
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<P>If you change the belowmouse widget, the previous one and all
|
|
parents (that don't contain the new widget) are sent <tt>FL_LEAVE</tt>
|
|
events. Changing this does <I>not</I> send <tt>FL_ENTER</tt> to this
|
|
or any widget, because sending <tt>FL_ENTER</tt> is supposed to <I>test</I>
|
|
if the widget wants the mouse (by it returning non-zero from <tt>
|
|
handle()</tt>).
|
|
|
|
<H4><A NAME="Fl.box_dh">int box_dh(Fl_Boxtype);</A></H4>
|
|
|
|
<P>Returns the height offset for the given boxtype.
|
|
|
|
<H4><A NAME="Fl.box_dw">int box_dw(Fl_Boxtype);</A></H4>
|
|
|
|
<P>Returns the width offset for the given boxtype.
|
|
|
|
<H4><A NAME="Fl.box_dx">int box_dx(Fl_Boxtype);</A></H4>
|
|
|
|
<P>Returns the X offset for the given boxtype.
|
|
|
|
<H4><A NAME="Fl.box_dy">int box_dy(Fl_Boxtype);</A></H4>
|
|
|
|
<P>Returns the Y offset for the given boxtype.
|
|
|
|
<H4><A NAME="Fl.check">int check();</A></H4>
|
|
|
|
<P>Same as <tt>Fl::wait(0)</tt>. Calling this during a big calculation
|
|
will keep the screen up to date and the interface responsive:
|
|
|
|
<UL><PRE>
|
|
while (!calculation_done()) {
|
|
calculate();
|
|
Fl::check();
|
|
if (user_hit_abort_button()) break;
|
|
}
|
|
</PRE></UL>
|
|
|
|
<P>The returns non-zero if any windows are displayed, and 0 if no
|
|
windows are displayed (this is likely to change in future versions of
|
|
FLTK).
|
|
|
|
<H4><A NAME="Fl.compose">int compose(int &del);</A></H4>
|
|
|
|
<p>Use of this function is very simple. Any text editing widget should
|
|
call this for each <tt>FL_KEYBOARD</tt> event.
|
|
|
|
<p>If <i>true</i> is returned, then it has modified the
|
|
Fl::event_text() and Fl::event_length() to a set of <i>bytes</i> to
|
|
insert (it may be of zero length!). In will also set the "del"
|
|
parameter to the number of <i>bytes</i> to the left of the cursor to
|
|
delete, this is used to delete the results of the previous call to
|
|
Fl::compose().
|
|
|
|
<p>If <i>false</i> is returned, the keys should be treated as function
|
|
keys, and del is set to zero. You could insert the text anyways, if
|
|
you don't know what else to do.
|
|
|
|
<p>Though the current implementation returns immediately, future
|
|
versions may take quite awhile, as they may pop up a window or do
|
|
other user-interface things to allow characters to be selected.
|
|
|
|
<H4><A NAME="Fl.compose_reset">void compose_reset();</A></H4>
|
|
|
|
<p>If the user moves the cursor, be sure to call Fl::compose_reset().
|
|
The next call to Fl::compose() will start out in an initial state. In
|
|
particular it will not set "del" to non-zero. This call is very fast
|
|
so it is ok to call it many times and in many places.
|
|
|
|
<H4><A NAME="Fl.copy">void copy(const char *stuff, int len, int clipboard);</A></H4>
|
|
|
|
<P>Copies the data pointed to by <TT>stuff</TT> to the selection
|
|
(0) or primary (1) clipboard. The selection clipboard is used
|
|
for middle-mouse pastes and for drag-and-drop selections. The
|
|
primary clipboard is used for traditional copy/cut/paste
|
|
operations.
|
|
|
|
<H4><A NAME="Fl.damage">int damage();<BR>
|
|
void damage(int x);</A></H4>
|
|
|
|
<P>If true then <A href="#Fl.flush"><tt>flush()</tt></A> will do something.
|
|
|
|
<H4><A NAME="Fl.default_atclose">void default_atclose(Fl_Window*,void*);</A></H4>
|
|
|
|
<H4><A NAME="Fl.display">void display(const char*);</A></H4>
|
|
|
|
<P>Sets the X display to use for all windows. Actually this just sets
|
|
the environment variable $DISPLAY to the passed string, so this only
|
|
works before you show() the first window or otherwise open the display,
|
|
and does nothing useful under WIN32.
|
|
|
|
<H4><A NAME="Fl.dnd">int dnd();</A></H4>
|
|
|
|
<P>Initiate a Drag And Drop operation. The clipboard should be
|
|
filled with relevant data before calling this method. FLTK will
|
|
then initiate the system wide drag and drop handling. Dropped data
|
|
will be marked as <i>text</i>.
|
|
|
|
<H4><A NAME="Fl.dnd_text_ops">void dnd_text_ops(int d);<BR>
|
|
int dnd_text_ops();</A></H4>
|
|
|
|
<P>Gets or sets whether drag and drop text operations are
|
|
supported. This specifically affects whether selected text can
|
|
be dragged from text fields or dragged within a text field as a
|
|
cut/paste shortcut.
|
|
|
|
<H4><A NAME="Fl.error">void (*error)(const char*, ...);</A></H4>
|
|
|
|
<P>FLTK calls this to print a normal error message. You can
|
|
override the behavior by setting the function pointer to your
|
|
own routine.
|
|
|
|
<P><tt>Fl::error</tt> means there is a recoverable error such as
|
|
the inability to read an image file. The default implementation
|
|
prints the error message to <TT>stderr</TT> and returns.
|
|
|
|
<H4><A NAME="Fl.event_alt">int event_alt();</A></H4>
|
|
|
|
<P>Returns non-zero if the Alt key is pressed.
|
|
|
|
<H4><A NAME="Fl.event_button1">int event_button1();</A></H4>
|
|
|
|
<P>Returns non-zero if button 1 is pressed.
|
|
|
|
<H4><A NAME="Fl.event_button2">int event_button2();</A></H4>
|
|
|
|
<P>Returns non-zero if button 2 is pressed.
|
|
|
|
<H4><A NAME="Fl.event_button3">int event_button3();</A></H4>
|
|
|
|
<P>Returns non-zero if button 3 is pressed.
|
|
|
|
<H4><A NAME="Fl.event_button">int event_button();</A></H4>
|
|
|
|
<P>Returns which mouse button was pressed. This returns garbage if the
|
|
most recent event was not a <tt>FL_PUSH</tt> or <tt>FL_RELEASE</tt>
|
|
event.
|
|
|
|
<H4><A NAME="Fl.event_buttons">int event_buttons();</A></H4>
|
|
|
|
<P>Returns the button state bits; if non-zero, then at least one
|
|
button is pressed.
|
|
|
|
<H4><A NAME="Fl.event_clicks">int event_clicks();</A></H4>
|
|
|
|
<P>The first form returns non-zero if the most recent <tt>FL_PUSH</tt> or
|
|
<tt>FL_KEYBOARD</tt> was a "double click". Returns N-1 for
|
|
N clicks. A double click is counted if the same button is pressed
|
|
again while <tt>event_is_click()</tt> is true.
|
|
|
|
<P>The second form directly sets the number returned by <tt>
|
|
Fl::event_clicks()</tt>. This can be used to set it to zero so that
|
|
later code does not think an item was double-clicked.
|
|
|
|
<H4><A NAME="Fl.event_ctrl">int event_ctrl();</A></H4>
|
|
|
|
<P>Returns non-zero if the Control key is pressed.
|
|
|
|
<H4><A NAME="Fl.event">int event();</A></H4>
|
|
|
|
<P>Returns the last event that was processed. This can be used
|
|
to determine if a callback is being done in response to a
|
|
keypress, mouse click, etc.
|
|
|
|
<H4><A NAME="Fl.event_inside">int event_inside(int,int,int,int);<BR>
|
|
int event_inside(const Fl_Widget*);</A></H4>
|
|
|
|
<P>Returns non-zero if the current <tt>event_x</tt> and <tt>event_y</tt>
|
|
put it inside the widget or inside an arbitrary bounding box. You
|
|
should always call this rather than doing your own comparison so you
|
|
are consistent about edge effects.
|
|
|
|
<H4><A NAME="Fl.event_is_click">int event_is_click();<BR>
|
|
void event_is_click(0);</A></H4>
|
|
|
|
<P>The first form returns non-zero if the mouse has not moved far enough
|
|
and not enough time has passed since the last <tt>FL_PUSH</tt> or <tt>
|
|
FL_KEYBOARD</tt> event for it to be considered a "drag" rather than a
|
|
"click". You can test this on <tt>FL_DRAG</tt>, <tt>FL_RELEASE</tt>,
|
|
and <tt>FL_MOVE</tt> events. The second form clears the value returned
|
|
by <tt>Fl::event_is_click()</tt>. Useful to prevent the <I>next</I>
|
|
click from being counted as a double-click or to make a popup menu
|
|
pick an item with a single click. Don't pass non-zero to this.
|
|
|
|
<H4><A NAME="Fl.event_key">int event_key();<BR>
|
|
int event_key(int s);</A></H4>
|
|
|
|
<P><tt>Fl::event_key()</tt> returns which key on the keyboard was last
|
|
pushed. It returns zero if the last event was not a key press or release.
|
|
|
|
<P><tt>Fl::event_key(int)</tt> returns true if the given key was held
|
|
down (or pressed) <I>during</I> the last event. This is constant until
|
|
the next event is read from the server.
|
|
|
|
<P><tt>Fl::get_key(int)</tt> returns true if the given key is held down <I>
|
|
now</I>. Under X this requires a round-trip to the server and is <I>
|
|
much</I> slower than <tt>Fl::event_key(int)</tt>.
|
|
|
|
<P>Keys are identified by the <I>unshifted</I> values. FLTK defines a
|
|
set of symbols that should work on most modern machines for every key
|
|
on the keyboard:
|
|
|
|
<UL>
|
|
<LI>All keys on the main keyboard producing a printable ASCII
|
|
character use the value of that ASCII character (as though shift,
|
|
ctrl, and caps lock were not on). The space bar is 32. </LI>
|
|
<LI>All keys on the numeric keypad producing a printable ASCII
|
|
character use the value of that ASCII character plus <tt>FL_KP</tt>.
|
|
The highest possible value is <tt>FL_KP_Last</tt> so you can
|
|
range-check to see if something is on the keypad. </LI>
|
|
<LI>All numbered function keys use the number on the function key plus <tt>
|
|
FL_F</tt>. The highest possible number is <tt>FL_F_Last</tt>, so you
|
|
can range-check a value. </LI>
|
|
<LI>Buttons on the mouse are considered keys, and use the button
|
|
number (where the left button is 1) plus <tt>FL_Button</tt>. </LI>
|
|
<LI>All other keys on the keypad have a symbol: <tt>FL_Escape,
|
|
FL_BackSpace, FL_Tab, FL_Enter, FL_Print, FL_Scroll_Lock, FL_Pause,
|
|
FL_Insert, FL_Home, FL_Page_Up, FL_Delete, FL_End, FL_Page_Down,
|
|
FL_Left, FL_Up, FL_Right, FL_Down, FL_Shift_L, FL_Shift_R,
|
|
FL_Control_L, FL_Control_R, FL_Caps_Lock, FL_Alt_L, FL_Alt_R,
|
|
FL_Meta_L, FL_Meta_R, FL_Menu, FL_Num_Lock, FL_KP_Enter</tt>. Be
|
|
careful not to confuse these with the very similar, but all-caps,
|
|
symbols used by <a href="Fl.html#Fl.event_state"><tt>Fl::event_state()</tt>
|
|
</A>. </LI>
|
|
</UL>
|
|
|
|
<P>On X <tt>Fl::get_key(FL_Button+n)</tt> does not work.
|
|
|
|
<P>On WIN32 <tt>Fl::get_key(FL_KP_Enter)</tt> and <tt>
|
|
Fl::event_key(FL_KP_Enter)</tt> do not work.
|
|
|
|
<H4><A NAME="Fl.event_length">int event_length();</A></H4>
|
|
|
|
<P>Returns the length of the text in <tt>Fl::event_text()</tt>. There
|
|
will always be a nul at this position in the text. However there may
|
|
be a nul before that if the keystroke translates to a nul character or
|
|
you paste a nul character.
|
|
|
|
<H4><A NAME="Fl.event_shift">int event_shift();</A></H4>
|
|
|
|
<P>Returns non-zero if the Shift key is pressed.
|
|
|
|
<H4><A NAME="Fl.event_state">int event_state();<BR>
|
|
int event_state(int i);</A></H4>
|
|
|
|
<P>This is a bitfield of what shift states were on and what mouse buttons
|
|
were held down during the most recent event. The second version
|
|
returns non-zero if any of the passed bits are turned on. The legal
|
|
bits are:
|
|
|
|
<UL>
|
|
<LI><tt>FL_SHIFT</tt></LI>
|
|
<LI><tt>FL_CAPS_LOCK</tt></LI>
|
|
<LI><tt>FL_CTRL</tt></LI>
|
|
<LI><tt>FL_ALT</tt></LI>
|
|
<LI><tt>FL_NUM_LOCK</tt></LI>
|
|
<LI><tt>FL_META</tt></LI>
|
|
<LI><tt>FL_SCROLL_LOCK</tt></LI>
|
|
<LI><tt>FL_BUTTON1</tt></LI>
|
|
<LI><tt>FL_BUTTON2</tt></LI>
|
|
<LI><tt>FL_BUTTON3</tt></LI>
|
|
</UL>
|
|
|
|
<P>X servers do not agree on shift states, and FL_NUM_LOCK, FL_META, and
|
|
FL_SCROLL_LOCK may not work. The values were selected to match the
|
|
XFree86 server on Linux. In addition there is a bug in the way X works
|
|
so that the shift state is not correctly reported until the first event <I>
|
|
after</I> the shift key is pressed or released.
|
|
|
|
<H4><A NAME="Fl.event_x">int event_x();</A></H4>
|
|
|
|
<P>Returns the mouse position of the event relative to the <tt>Fl_Window</tt>
|
|
it was passed to.
|
|
|
|
<H4><A NAME="Fl.event_x_root">int event_x_root();</A></H4>
|
|
|
|
<P>Returns the mouse position on the screen of the event. To find the
|
|
absolute position of an <tt>Fl_Window</tt> on the screen, use the
|
|
difference between <tt>event_x_root(),event_y_root()</tt> and <tt>
|
|
event_x(),event_y()</tt>.
|
|
|
|
<H4><A NAME="Fl.event_y">int event_y();</A></H4>
|
|
|
|
<P>Returns the mouse position of the event relative to the <tt>Fl_Window</tt>
|
|
it was passed to.
|
|
|
|
<H4><A NAME="Fl.event_y_root">int event_y_root();</A></H4>
|
|
|
|
<P>Returns the mouse position on the screen of the event. To find the
|
|
absolute position of an <tt>Fl_Window</tt> on the screen, use the
|
|
difference between <tt>event_x_root(),event_y_root()</tt> and <tt>
|
|
event_x(),event_y()</tt>.
|
|
|
|
<H4><A NAME="Fl.fatal">void (*fatal)(const char*, ...);</A></H4>
|
|
|
|
<P>FLTK calls this to print a fatal error message. You can
|
|
override the behavior by setting the function pointer to your
|
|
own routine.
|
|
|
|
<P><tt>Fl::fatal</tt> must not return, as FLTK is in an unusable
|
|
state, however your version may be able to use <tt>longjmp</tt>
|
|
or an exception to continue, as long as it does not call FLTK
|
|
again. The default implementation prints the error message to
|
|
<TT>stderr</TT> and exits with status 1.
|
|
|
|
<H4><A NAME="Fl.first_window">Fl_Window* first_window();<BR>
|
|
void first_window(Fl_Window*);</A></H4>
|
|
|
|
<P>Returns the first top-level window in the list of shown() windows. If
|
|
a modal() window is shown this is the top-most modal window, otherwise
|
|
it is the most recent window to get an event.
|
|
|
|
<P>The second form sets the window that is returned by
|
|
first_window. The window is removed from wherever it is in the
|
|
list and inserted at the top. This is not done if Fl::modal()
|
|
is on or if the window is not shown(). Because the first window
|
|
is used to set the "parent" of modal windows, this is often
|
|
useful.
|
|
|
|
<H4><A NAME="Fl.flush">void flush();</A></H4>
|
|
|
|
<P>Causes all the windows that need it to be redrawn and graphics forced
|
|
out through the pipes. This is what <tt>wait()</tt> does before
|
|
looking for events.
|
|
|
|
<H4><A NAME="Fl.focus">Fl_Widget* focus();<BR>
|
|
void focus(Fl_Widget*);</A></H4>
|
|
|
|
<P>Get or set the widget that will receive <tt>FL_KEYBOARD</tt> events.
|
|
|
|
<P>If you change <tt>Fl::focus()</tt>, the previous widget and all
|
|
parents (that don't contain the new widget) are sent <tt>FL_UNFOCUS</tt>
|
|
events. Changing the focus does <I>not</I> send <tt>FL_FOCUS</tt> to
|
|
this or any widget, because sending <tt>FL_FOCUS</tt> is supposed to <I>
|
|
test</I> if the widget wants the focus (by it returning non-zero from
|
|
<tt>handle()</tt>).
|
|
|
|
<H4><A NAME="Fl.foreground">void foreground(uchar, uchar, uchar);</A></H4>
|
|
|
|
<P>Changes <tt>fl_color(FL_BLACK)</tt>. Also changes <tt>
|
|
FL_INACTIVE_COLOR</tt> and <tt>FL_SELECTION_COLOR</tt> to be a ramp
|
|
between this and <tt>FL_WHITE</tt>.
|
|
|
|
<H4><A NAME="Fl.free_color">void free_color(Fl_Color c, int overlay = 0);</A></H4>
|
|
|
|
<P>Frees the specified color from the colormap, if applicable.
|
|
If <tt>overlay</tt> is non-zero then the color is freed from the
|
|
overlay colormap.
|
|
|
|
<H4><A NAME="Fl.get_boxtype">Fl_Box_Draw_F *get_boxtype(Fl_Boxtype);</A></H4>
|
|
|
|
<P>Gets the current box drawing function for the specified box type.
|
|
|
|
|
|
<H4><A NAME="Fl.get_color">unsigned get_color(Fl_Color c);<BR>
|
|
void get_color(Fl_Color c, uchar&r, uchar&g, uchar&b);</A></H4>
|
|
|
|
<P>Returns the color index or RGB value for the given FLTK color index.
|
|
|
|
<H4><A NAME="Fl.get_font">const char* get_font(Fl_Font);</A></H4>
|
|
|
|
<P>Get the string for this face. This string is different for each
|
|
face. Under X this value is passed to XListFonts to get all the sizes
|
|
of this face.
|
|
|
|
<H4><A NAME="Fl.get_font_name">const char* get_font_name(Fl_Font, int* attributes = 0);</A></H4>
|
|
|
|
<P>Get a human-readable string describing the family of this face. This
|
|
is useful if you are presenting a choice to the user. There is no
|
|
guarantee that each face has a different name. The return value points
|
|
to a static buffer that is overwritten each call.
|
|
|
|
<P>The integer pointed to by <tt>attributes</tt> (if the pointer is not
|
|
zero) is set to zero, <tt>FL_BOLD</tt> or <tt>FL_ITALIC</tt> or <tt>
|
|
FL_BOLD | FL_ITALIC</tt>. To locate a "family" of fonts, search
|
|
forward and back for a set with non-zero attributes, these faces along
|
|
with the face with a zero attribute before them constitute a family.
|
|
|
|
<H4><A NAME="Fl.get_font_sizes">int get_font_sizes(Fl_Font, int*& sizep);</A></H4>
|
|
|
|
<P>Return an array of sizes in <tt>sizep</tt>. The return value is the
|
|
length of this array. The sizes are sorted from smallest to largest
|
|
and indicate what sizes can be given to <tt>fl_font()</tt> that will
|
|
be matched exactly (<tt>fl_font()</tt> will pick the closest size for
|
|
other sizes). A zero in the first location of the array indicates a
|
|
scalable font, where any size works, although the array may list sizes
|
|
that work "better" than others. Warning: the returned array
|
|
points at a static buffer that is overwritten each call. Under X this
|
|
will open the display.
|
|
|
|
<H4><A NAME="Fl.get_key">int get_key(int);</A></H4>
|
|
|
|
<H4><A NAME="Fl.get_mouse">void get_mouse(int &x,int &y);</A></H4>
|
|
|
|
<P>Return where the mouse is on the screen by doing a round-trip query to
|
|
the server. You should use <tt>Fl::event_x_root()</tt> and <tt>
|
|
Fl::event_y_root()</tt> if possible, but this is necessary if you are
|
|
not sure if a mouse event has been processed recently (such as to
|
|
position your first window). If the display is not open, this will
|
|
open it.
|
|
|
|
<H4><A NAME="Fl.get_system_colors">void get_system_colors();</A></H4>
|
|
|
|
<P>Read the user preference colors from the system and use them to call
|
|
<tt> Fl::foreground()</tt>, <tt>Fl::background()</tt>, and <tt>
|
|
Fl::background2()</tt>. This is done by
|
|
<tt>Fl_Window::show(argc,argv)</tt> before applying the -fg and -bg
|
|
switches.
|
|
|
|
<P>On X this reads some common values from the Xdefaults database.
|
|
KDE users can set these values by running the "krdb" program, and
|
|
newer versions of KDE set this automatically if you check the "apply
|
|
style to other X programs" switch in their control panel.
|
|
|
|
<H4><A NAME="Fl.gl_visual">int gl_visual(int, int *alist=0);</A></H4>
|
|
|
|
<P>This does the same thing as
|
|
<A href="#Fl.visual"><tt>Fl::visual(int)</tt></A> but also
|
|
requires OpenGL drawing to work. This <I>must</I> be done if
|
|
you want to draw in normal windows with OpenGL with <A
|
|
href=opengl.html#gl_start> <tt>gl_start()</tt></A> and
|
|
<tt>gl_end()</tt>. It may be useful to call this so your X
|
|
windows use the same visual as an
|
|
<A href="Fl_Gl_Window.html"><tt>Fl_Gl_Window</tt></A>, which on
|
|
some servers will reduce colormap flashing.
|
|
|
|
<P>See <A href="Fl_Gl_Window.html#Fl_Gl_Window.mode"><tt>Fl_Gl_Window</tt></A>
|
|
for a list of additional values for the argument.
|
|
|
|
<H4><A NAME="Fl.grab">Fl_Window* grab();<BR>
|
|
void grab(Fl_Window&w) {grab(&w);}</A></H4>
|
|
|
|
<P>This is used when pop-up menu systems are active. Send all events to
|
|
the passed window no matter where the pointer or focus is (including
|
|
in other programs). The window <I>does not have to be
|
|
<tt>shown()</tt></I> , this lets the <tt>handle()</tt> method of a
|
|
"dummy" window override all event handling and allows you to
|
|
map and unmap a complex set of windows (under both X and WIN32
|
|
<I>some</I> window must be mapped because the system interface needs a
|
|
window id).
|
|
|
|
<P>If <tt>grab()</tt> is on it will also affect show() of windows by
|
|
doing system-specific operations (on X it turns on
|
|
override-redirect). These are designed to make menus popup reliably
|
|
and faster on the system.
|
|
|
|
<P>To turn off grabbing do <tt>Fl::grab(0)</tt>.
|
|
|
|
<P><I>Be careful that your program does not enter an infinite loop
|
|
while <tt>grab()</tt> is on. On X this will lock up your screen!</I>
|
|
|
|
<H4><A NAME="Fl.h">int h();</A></H4>
|
|
|
|
<P>Returns the height of the screen in pixels.
|
|
|
|
<H4><A NAME="Fl.handle">int handle(int, Fl_Window*);</A></H4>
|
|
|
|
<P>Sends the event to a window for processing. Returns non-zero if any
|
|
widget uses the event.
|
|
|
|
<H4><A NAME="Fl.has_check">int has_check(Fl_Timeout_Handler, void* = 0);</A></H4>
|
|
|
|
<P>Returns true if the check exists and has not been called yet.
|
|
|
|
<H4><A NAME="Fl.has_idle">int has_idle(void (*cb)(void*), void* = 0);</A></H4>
|
|
|
|
<P>Returns true if the specified idle callback is currently installed.
|
|
|
|
<H4><A NAME="Fl.has_timeout">int has_timeout(Fl_Timeout_Handler, void* = 0);</A></H4>
|
|
|
|
<P>Returns true if the timeout exists and has not been called yet.
|
|
|
|
<H4><A NAME="Fl.lock">void lock();</A></H4>
|
|
|
|
<P>The <TT>lock()</TT> method blocks the current thread until it
|
|
can safely access FLTK widgets and data. Child threads should
|
|
call this method prior to updating any widgets or accessing
|
|
data. The main thread must call <TT>lock()</TT> to initialize
|
|
the threading support in FLTK.
|
|
|
|
<P>Child threads must call <A
|
|
HREF="#Fl.unlock"><TT>unlock()</TT></A> when they are done
|
|
accessing FLTK.
|
|
|
|
<P>When the <A HREF="#Fl.wait"><TT>wait()</TT></A> method is waiting
|
|
for input or timeouts, child threads are given access to FLTK.
|
|
Similarly, when the main thread needs to do processing, it will
|
|
wait until all child threads have called <A
|
|
HREF="#Fl.unlock"><TT>unlock()</TT></A> before processing
|
|
additional data.
|
|
|
|
<H4><A NAME="Fl.modal">Fl_Window* modal();</A></H4>
|
|
|
|
<P>Returns the top-most <tt>modal()</tt> window currently shown.
|
|
This is the most recently <tt>
|
|
shown()</tt> window with <A href=Fl_Window.html#Fl_Window.modal><tt>
|
|
modal()</tt></A> true, or <tt>NULL</tt> if there are no <tt>modal()</tt>
|
|
windows <tt>shown()</tt>.
|
|
The <tt>modal()</tt> window has its <tt>handle()</tt> method called
|
|
for all events, and no other windows will have <tt>handle()</tt>
|
|
called (<A href="#Fl.grab"><tt>grab()</tt></A> overrides this).
|
|
|
|
<H4><A NAME="Fl.next_window">Fl_Window* next_window(const Fl_Window*);</A></H4>
|
|
|
|
<P>Returns the next top-level window in the list of shown() windows. You can
|
|
use this call to iterate through all the windows that are shown().
|
|
|
|
<H4><A NAME="Fl.own_colormap">void own_colormap();</A></H4>
|
|
|
|
<P>Makes FLTK use its own colormap. This may make FLTK display better
|
|
and will reduce conflicts with other programs that want lots of colors.
|
|
However the colors may flash as you move the cursor between windows.
|
|
|
|
<P>This does nothing if the current visual is not colormapped.
|
|
|
|
<H4><A NAME="Fl.paste">void paste(Fl_Widget &receiver);</A></H4>
|
|
|
|
<P>Set things up so the receiver widget will be called with an <A href="enumerations.html#events">
|
|
<tt>FL_PASTE</tt></A> event some time in the future. The reciever
|
|
should be prepared to be called <I>directly</I> by this, or for it to
|
|
happen <I>later</I>, or possibly <I>not at all</I>. This allows the
|
|
window system to take as long as necessary to retrieve the paste buffer
|
|
(or even to screw up completely) without complex and error-prone
|
|
synchronization code in FLTK.
|
|
|
|
<H4><A NAME="Fl.pushed">Fl_Widget* pushed();<BR>
|
|
void pushed(Fl_Widget*);</A></H4>
|
|
|
|
<P>Get or set the widget that is being pushed. <tt>FL_DRAG</tt> or <tt>
|
|
FL_RELEASE</tt> (and any more <tt>FL_PUSH</tt>) events will be sent to
|
|
this widget.
|
|
|
|
<P>If you change the pushed widget, the previous one and all parents
|
|
(that don't contain the new widget) are sent <tt>FL_RELEASE</tt>
|
|
events. Changing this does <I>not</I> send <tt>FL_PUSH</tt> to this
|
|
or any widget, because sending <tt>FL_PUSH</tt> is supposed to <I>test</I>
|
|
if the widget wants the mouse (by it returning non-zero from <tt>
|
|
handle()</tt>).
|
|
|
|
<H4><A NAME="Fl.readqueue">Fl_Widget* readqueue();</A></H4>
|
|
|
|
<P>All <tt>Fl_Widgets</tt> that don't have a callback defined use a
|
|
default callback that puts a pointer to the widget in this queue, and
|
|
this method reads the oldest widget out of this queue.
|
|
|
|
<H4><A NAME="Fl.ready">int ready();</A></H4>
|
|
|
|
<P>This is similar to <tt>Fl::check()</tt> except this does <I>not</I>
|
|
call <tt>Fl::flush()</tt> or any callbacks, which is useful if your
|
|
program is in a state where such callbacks are illegal. This returns
|
|
true if <tt>Fl::check()</tt> would do anything (it will continue to
|
|
return true until you call <tt>Fl::check()</tt> or <tt>Fl::wait()</tt>).
|
|
|
|
<UL><PRE>
|
|
while (!calculation_done()) {
|
|
calculate();
|
|
if (Fl::ready()) {
|
|
do_expensive_cleanup();
|
|
Fl::check();
|
|
if (user_hit_abort_button()) break;
|
|
}
|
|
}
|
|
</PRE></UL>
|
|
|
|
<H4><A NAME="Fl.redraw">void redraw();</A></H4>
|
|
|
|
<P>Redraws all widgets.
|
|
|
|
<H4><A NAME="Fl.release">void release();</A></H4>
|
|
|
|
<H4><A NAME="Fl.remove_check">void remove_check(Fl_Timeout_Handler, void* = 0);</A></H4>
|
|
|
|
<P>Removes a check callback. It is harmless to remove a check
|
|
callback that no longer exists.
|
|
|
|
<H4><A NAME="Fl.remove_fd">void remove_fd(int, int when);<BR>
|
|
void remove_fd(int);</A></H4>
|
|
|
|
<P>Removes a file descriptor handler.
|
|
|
|
<H4><A NAME="Fl.remove_handler">void remove_handler(int (*h)(int));</A></H4>
|
|
|
|
<P>Removes a previously added event handler.
|
|
|
|
<H4><A NAME="Fl.remove_idle">void remove_idle(void (*cb)(void*), void* = 0);</A></H4>
|
|
|
|
<P>Removes the specified idle callback, if it is installed.
|
|
|
|
<H4><A NAME="Fl.remove_timeout">void remove_timeout(Fl_Timeout_Handler, void* = 0);</A></H4>
|
|
|
|
<P>Removes a timeout callback. It is harmless to remove a timeout
|
|
callback that no longer exists.
|
|
|
|
<H4><A NAME="Fl.repeat_timeout">void repeat_timeout(double t, Fl_Timeout_Handler,void* = 0);</A></H4>
|
|
|
|
<P>Inside a timeout callback you can call this to add another timeout.
|
|
Rather than the time being measured from "now", it is measured from
|
|
when the system call elapsed that caused this timeout to be called. This
|
|
will result in far more accurate spacing of the timeout callbacks, it
|
|
also has slightly less system call overhead. (It will also use all
|
|
your machine time if your timeout code and FLTK's overhead take more
|
|
than <i>t</i> seconds, as the real timeout will be reduced to zero).
|
|
|
|
<p>It is undefined what this does if called from outside a timeout
|
|
callback.
|
|
|
|
<P>This code will print "TICK" each second on stdout, with a
|
|
fair degree of accuracy:
|
|
|
|
<UL><PRE>
|
|
void callback(void*) {
|
|
printf("TICK\n");
|
|
Fl::repeat_timeout(1.0,callback);
|
|
}
|
|
|
|
main() {
|
|
Fl::add_timeout(1.0,callback);
|
|
return Fl::run();
|
|
}
|
|
</PRE></UL>
|
|
|
|
<H4><A NAME="Fl.run">int run();</A></H4>
|
|
|
|
<P>As long as any windows are displayed this calls <tt>Fl::wait()</tt>
|
|
repeatedly. When all the windows are closed it returns zero
|
|
(supposedly it would return non-zero on any errors, but FLTK calls
|
|
exit directly for these). A normal program will end <tt>main()</tt>
|
|
with <tt>return Fl::run();</tt>.
|
|
|
|
<H4><A NAME="Fl.scheme">void scheme(const char *name);
|
|
<BR>const char *scheme();</A></H4>
|
|
|
|
<P>Gets or sets the current widget scheme. Currently only "none"
|
|
and "plastic" are recognized, and <TT>NULL</TT> will use the
|
|
scheme defined in the <TT>FLTK_SCHEME</TT> environment variable
|
|
or the <TT>scheme</TT> resource under X11.
|
|
|
|
<H4><A NAME="Fl.selection">void selection(Fl_Widget &owner, const char* stuff, int len);</A></H4>
|
|
|
|
<P>Changes the current selection. The block of text is
|
|
copied to an internal buffer by FLTK (be careful if doing this in
|
|
response to an <tt>FL_PASTE</tt> as this <I>may</I> be the same buffer
|
|
returned by <tt>event_text()</tt>). The <tt>selection_owner()</tt>
|
|
widget is set to the passed owner.
|
|
|
|
<H4><A NAME="Fl.selection_owner">Fl_Widget* selection_owner();<BR>
|
|
void selection_owner(Fl_Widget*);</A></H4>
|
|
|
|
<P>The single-argument <tt>selection_owner(x)</tt> call can be used to
|
|
move the selection to another widget or to set the owner to
|
|
<tt>NULL</tt>, without changing the actual text of the
|
|
selection. <tt>FL_SELECTIONCLEAR</tt> is sent to the previous
|
|
selection owner, if any.
|
|
|
|
<P><I>Copying the buffer every time the selection is changed is
|
|
obviously wasteful, especially for large selections. An interface will
|
|
probably be added in a future version to allow the selection to be made
|
|
by a callback function. The current interface will be emulated on top
|
|
of this.</I>
|
|
|
|
<H4><A NAME="Fl.set_abort">void set_abort(void (*f)(const char*,...));</A></H4>
|
|
|
|
<H4><A NAME="Fl.set_atclose">void set_atclose(void (*f)(Fl_Window*,void*));</A></H4>
|
|
|
|
<H4><A NAME="Fl.set_boxtype">void set_boxtype(Fl_Boxtype, Fl_Box_Draw_F*,uchar,uchar,uchar,uchar);<BR>
|
|
void set_boxtype(Fl_Boxtype, Fl_Boxtype from);</A></H4>
|
|
|
|
<P>The first form sets the function to call to draw a specific boxtype.
|
|
|
|
<P>The second form copies the <tt>from</tt> boxtype.
|
|
|
|
<H4><A NAME="Fl.set_color">void set_color(Fl_Color, uchar, uchar, uchar);<BR>
|
|
void set_color(Fl_Color, unsigned);</A></H4>
|
|
|
|
<P>Sets an entry in the <tt>fl_color</tt> index table. You can set it to
|
|
any 8-bit RGB color. The color is not allocated until <tt>fl_color(i)</tt>
|
|
is used.
|
|
|
|
<H4><A NAME="Fl.set_font">void set_font(Fl_Font, const char*);<BR>
|
|
void set_font(Fl_Font, Fl_Font);</A></H4>
|
|
|
|
<P>The first form changes a face. The string pointer is simply stored,
|
|
the string is not copied, so the string must be in static memory.
|
|
|
|
<P>The second form copies one face to another.
|
|
|
|
<H4><A NAME="Fl.set_fonts">Fl_Font set_fonts(const char* = 0);</A></H4>
|
|
|
|
<P>FLTK will open the display, and add every font on the server to the
|
|
face table. It will attempt to put "families" of faces together, so
|
|
that the normal one is first, followed by bold, italic, and bold
|
|
italic.
|
|
|
|
<P>The optional argument is a string to describe the set of fonts to
|
|
add. Passing <tt>NULL</tt> will select only fonts that have the
|
|
ISO8859-1 character set (and are thus usable by normal text). Passing
|
|
"-*" will select all fonts with any encoding as long as they have
|
|
normal X font names with dashes in them. Passing "*" will list every
|
|
font that exists (on X this may produce some strange output). Other
|
|
values may be useful but are system dependent. With WIN32 <tt>NULL</tt>
|
|
selects fonts with ISO8859-1 encoding and non-<tt>NULL</tt> selects
|
|
all fonts.
|
|
|
|
<P>The return value is how many faces are in the table after this is
|
|
done.
|
|
|
|
<H4><A NAME="Fl.set_idle">void set_idle(void (*cb)());</A></H4>
|
|
|
|
<P>Sets an idle callback.
|
|
|
|
<P>This method is obsolete - use the <A
|
|
HREF="#Fl.add_idle"><TT>add_idle()</TT></A> method instead.
|
|
|
|
<H4><A NAME="Fl.set_labeltype">void set_labeltype(Fl_Labeltype,Fl_Label_Draw_F*,Fl_Label_Measure_F*);<BR>
|
|
void set_labeltype(Fl_Labeltype, Fl_Labeltype from);</A></H4>
|
|
|
|
<P>The first form sets the functions to call to draw and measure a
|
|
specific labeltype.
|
|
|
|
<P>The second form copies the <tt>from</tt> labeltype.
|
|
|
|
<H4><A NAME="Fl.test_shortcut">int test_shortcut(int);</A></H4>
|
|
|
|
<P>Test the current event, which must be an <tt>FL_KEYBOARD</tt> or <tt>
|
|
FL_SHORTCUT</tt>, against a shortcut value (described in <A href=Fl_Button.html#Fl_Button.shortcut>
|
|
<tt>Fl_Button</tt></A>). Returns non-zero if there is a match. Not to
|
|
be confused with <A href="subclassing.html#test_shortcut"><tt>
|
|
Fl_Widget::test_shortcut()</tt></A>.
|
|
|
|
<H4><A NAME="Fl.thread_message">void *thread_message();</A></H4>
|
|
|
|
<P>The <TT>thread_message()</TT> method returns the last message
|
|
that was sent from a child by the <A
|
|
HREF="#Fl.awake"><TT>awake()</TT></A> method.
|
|
|
|
<H4><A NAME="Fl.unlock">void unlock();</A></H4>
|
|
|
|
<P>The <TT>unlock()</TT> method releases the lock that was set
|
|
using the <A HREF="#Fl.lock"><TT>lock()</TT></A> method. Child
|
|
threads should call this method as soon as they are finished
|
|
accessing FLTK.
|
|
|
|
<H4><A NAME="Fl.version">double version();</A></H4>
|
|
|
|
<P>Returns the compiled-in value of the FL_VERSION constant. This
|
|
is useful for checking the version of a shared library.
|
|
|
|
<H4><A NAME="Fl.visible_focus">void visible_focus(int v);<BR>
|
|
int visible_focus();</A></H4>
|
|
|
|
<P>Gets or sets the visible keyboard focus on buttons and other
|
|
non-text widgets. The default mode is to enable keyboard focus
|
|
for all widgets.
|
|
|
|
<H4><A NAME="Fl.visual">int visual(int);</A></H4>
|
|
|
|
<P>Selects a visual so that your graphics are drawn correctly. This is
|
|
only allowed before you call show() on any windows. This does nothing
|
|
if the default visual satisfies the capabilities, or if no visual
|
|
satisfies the capabilities, or on systems that don't have such
|
|
brain-dead notions.
|
|
|
|
<P>Only the following combinations do anything useful:
|
|
|
|
<UL>
|
|
<LI><tt>Fl::visual(FL_RGB)</tt>
|
|
<BR>Full/true color (if there are several depths FLTK chooses the
|
|
largest). Do this if you use <A href="drawing.html#fl_draw_image"><tt>fl_draw_image</tt>
|
|
</A> for much better (non-dithered) output.
|
|
<BR> </LI>
|
|
<LI><tt>Fl::visual(FL_RGB8)</tt>
|
|
<BR>Full color with at least 24 bits of color. <tt>FL_RGB</tt> will
|
|
always pick this if available, but if not it will happily return a
|
|
less-than-24 bit deep visual. This call fails if 24 bits are not
|
|
available.
|
|
<BR> </LI>
|
|
<LI><tt>Fl::visual(FL_DOUBLE|FL_INDEX)</tt>
|
|
<BR>Hardware double buffering. Call this if you are going to use <A href=Fl_Double_Window.html#Fl_Double_Window>
|
|
<tt>Fl_Double_Window</tt></A>.
|
|
<BR> </LI>
|
|
<LI><tt>Fl::visual(FL_DOUBLE|FL_RGB)</tt></LI>
|
|
<LI><tt>Fl::visual(FL_DOUBLE|FL_RGB8)</tt>
|
|
<BR>Hardware double buffering and full color.
|
|
</UL>
|
|
|
|
<P>This returns true if the system has the capabilities by default or
|
|
FLTK suceeded in turing them on. Your program will still work even if
|
|
this returns false (it just won't look as good).
|
|
|
|
<H4><A NAME="Fl.w">int w();</A></H4>
|
|
|
|
<P>Returns the width of the screen in pixels.
|
|
|
|
<H4><A NAME="Fl.wait">int wait();<BR>
|
|
double wait(double time);</A></H4>
|
|
|
|
<P>Waits until "something happens" and then returns. Call this
|
|
repeatedly to "run" your program. You can also check what happened
|
|
each time after this returns, which is quite useful for managing
|
|
program state.
|
|
|
|
<P>What this really does is call all idle callbacks, all elapsed
|
|
timeouts, call <tt>Fl::flush()</tt> to get the screen to update, and
|
|
then wait some time (zero if there are idle callbacks, the shortest of
|
|
all pending timeouts, or infinity), for any events from the user or
|
|
any <tt>Fl::add_fd()</tt> callbacks. It then handles the events and
|
|
calls the callbacks and then returns.
|
|
|
|
<P>The return value of the first form is non-zero if there are
|
|
any visible windows - this may change in future versions of
|
|
FLTK.
|
|
|
|
<P>The second form waits a maximum of <i>time</i>
|
|
seconds. <i>It can return much sooner if something happens.</i>
|
|
|
|
<P>The return value is positive if an event or fd happens before the
|
|
time elapsed. It is zero if nothing happens (on Win32 this will only
|
|
return zero if <i>time</i> is zero). It is negative if an error
|
|
occurs (this will happen on UNIX if a signal happens).
|
|
|
|
<H4><A NAME="Fl.warning">void (*warning)(const char*, ...);</A></H4>
|
|
|
|
<P>FLTK calls this to print a warning message. You can
|
|
override the behavior by setting the function pointer to your
|
|
own routine.
|
|
|
|
<P><tt>Fl::warning</tt> means that there was a recoverable
|
|
problem, the display may be messed up but the user can probably
|
|
keep working - all X protocol errors call this, for example.
|
|
|
|
<H4><A NAME="Fl.x">int x();</A></H4>
|
|
|
|
<P>Returns the origin of the current screen, where 0 indicates
|
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the left side of the screen.
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<H4><A NAME="Fl.y">int y();</A></H4>
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<P>Returns the origin of the current screen, where 0 indicates
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the top edge of the screen.
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<H4><A NAME="Fl.event_dx">int event_dx();</A></H4>
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<H4><A NAME="Fl.event_dy">int event_dy();</A></H4>
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<H4><A NAME="Fl.event_text">const char* event_text();</A></H4>
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</BODY>
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</HTML>
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