88 lines
2.0 KiB
HTML
88 lines
2.0 KiB
HTML
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<html>
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<body>
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<hr break>
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<h2><a name="Fl_Free">class Fl_Free</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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<a href="#Fl_Widget">Fl_Widget</a>
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+----<b>Fl_Free</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_Free.H>
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</pre></ul>
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<h3>Description</h3>
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Emulation of the Forms "free" widget. This emulation allows the free
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demo to run, and appears to be useful for porting programs written in
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Forms which use the free widget or make subclasses of the Forms widgets.
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<p>There are five types of free, which determine when the handle
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function is called:
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<ul><pre>
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#define FL_NORMAL_FREE 1
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#define FL_SLEEPING_FREE 2
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#define FL_INPUT_FREE 3
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#define FL_CONTINUOUS_FREE 4
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#define FL_ALL_FREE 5
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</pre></ul>
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<p>An FL_INPUT_FREE accepts FL_FOCUS events. A FL_CONTINUOUS_FREE
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sets a timeout callback 100 times a second and provides a FL_STEP
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event, this has obvious detrimental effects on machine performance.
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FL_ALL_FREE does both. FL_SLEEPING_FREE are deactivated.
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<h3>Methods</h3>
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<ul>
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<li><a href="#Fl_Free.Fl_Free">Fl_Free</a>
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<li><a href="#Fl_Free.~Fl_Free">~Fl_Free</a>
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</ul>
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<h4><a name="Fl_Free.Fl_Free">Fl_Free(uchar type, int, int, int, int, const char*l, FL_HANDLEPTR hdl)</a></h4>
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The constructor takes both the <tt>type</tt> and the <tt>handle</tt> function.
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The handle function should be declared as follows:
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<ul><pre>
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int
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handle_function(Fl_Widget *w,
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int event,
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float event_x,
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float event_y,
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char key)
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</pre></ul>
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This function is called from the the <tt>handle()</tt> method in
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response to most events, and is called by the <tt>draw()</tt> method.
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The <tt>event</tt> argument contains the event type:
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<ul><pre>
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// old event names for compatability:
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#define FL_MOUSE FL_DRAG
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#define FL_DRAW 0
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#define FL_STEP 9
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#define FL_FREEMEM 12
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#define FL_FREEZE FL_UNMAP
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#define FL_THAW FL_MAP
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</pre></ul>
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<h4><a name="Fl_Free.~Fl_Free">virtual Fl_Free::~Fl_Free()</a></h4>
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The destructor will call the handle function with the event
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<tt>FL_FREE_MEM</tt>.
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</body>
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</html>
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