1999-01-13 22:28:54 +03:00
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<HTML><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>
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<PRE>
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<A href=Fl_Widget.html#Fl_Widget>Fl_Widget</A>
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1998-12-29 17:21:17 +03:00
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1999-01-13 22:28:54 +03:00
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+----<B>Fl_Free</B>
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</PRE>
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</UL>
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<H3>Include Files</H3>
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<UL>
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<PRE>
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#include <FL/Fl_Free.H>
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</PRE>
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</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
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widgets.
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<P>There are five types of free, which determine when the handle
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function is called: </P>
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<UL>
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<PRE>
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1998-12-29 17:21:17 +03:00
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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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1999-01-13 22:28:54 +03:00
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</PRE>
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</UL>
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<P>An FL_INPUT_FREE accepts FL_FOCUS events. A FL_CONTINUOUS_FREE sets
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a timeout callback 100 times a second and provides a FL_STEP event,
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this has obvious detrimental effects on machine performance.
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FL_ALL_FREE does both. FL_SLEEPING_FREE are deactivated. </P>
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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></LI>
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<LI><A href=#Fl_Free.~Fl_Free>~Fl_Free</A></LI>
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</UL>
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<H4><A name=Fl_Free.Fl_Free>Fl_Free(uchar type, int, int, int, int,
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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>
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function. The handle function should be declared as follows:
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<UL>
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<PRE>
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1998-12-29 17:21:17 +03:00
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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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1999-01-13 22:28:54 +03:00
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</PRE>
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</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>
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<PRE>
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1998-12-29 17:21:17 +03:00
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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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1999-01-13 22:28:54 +03:00
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</PRE>
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</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 <TT>
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FL_FREE_MEM</TT>. </BODY></HTML>
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