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_Scrollbar>class Fl_Scrollbar</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_Slider.html#Fl_Slider>Fl_Slider</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_Scrollbar</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_Scrollbar.H>
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</PRE>
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</UL>
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<H3>Description</H3>
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The <TT>Fl_Scrollbar</TT> widget displays a slider with arrow buttons
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at the ends of the scrollbar. Clicking on the arrows move up/left and
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down/right by <TT>linesize()</TT>. Scrollbars also accept <TT>
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FL_SHORTCUT</TT> events: the arrows move by <TT>linesize()</TT>, and
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vertical scrollbars take Page Up/Down (they move by the page size minus <TT>
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linesize()</TT>) and Home/End (they jump to the top or bottom).
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<P>Scrollbars have <TT>step(1)</TT> preset (they always return
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integers). If desired you can set the <TT>step()</TT> to non-integer
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values. You will then have to use casts to get at the floating-point
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versions of <TT>value()</TT> from <TT>Fl_Slider</TT>. </P>
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2001-10-01 00:25:36 +04:00
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<P ALIGN=CENTER><IMG src="scrollbar.gif" ALT="Fl_Scrollbar widget."></P>
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1999-01-13 22:28:54 +03:00
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<H3>Methods</H3>
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<UL>
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<LI><A href=#Fl_Scrollbar.Fl_Scrollbar>Fl_Scrollbar</A></LI>
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<LI><A href=#Fl_Scrollbar.~Fl_Scrollbar>~Fl_Scrollbar</A></LI>
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<LI><A href=#Fl_Scrollbar.linesize>linesize</A></LI>
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<LI><A href=#Fl_Scrollbar.value>value</A></LI>
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</UL>
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<H4><A name=Fl_Scrollbar.Fl_Scrollbar>Fl_Scrollbar::Fl_Scrollbar(int x,
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int y, int w, int h, const char *label = 0)</A></H4>
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Creates a new <TT>Fl_Scrollbar</TT> widget using the given position,
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size, and label string. You need to do <TT>type(FL_HORIZONTAL)</TT> if
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you want a horizontal scrollbar.
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<H4><A name=Fl_Scrollbar.~Fl_Scrollbar>virtual
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Fl_Scrollbar::~Fl_Scrollbar()</A></H4>
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Destroys the valuator.
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<H4><A name=Fl_Scrollbar.linesize>int Fl_Scrollbar::linesize() const
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<BR> void Fl_Scrollbar::linesize(int i)</A></H4>
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This number controls how big the steps are that the arrow keys do. In
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addition page up/down move by the size last sent to <TT>value()</TT>
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minus one <TT>linesize()</TT>. The default is 16.
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<H4><A name=Fl_Scrollbar.value>int Fl_Scrollbar::value()
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<BR> int Fl_Scrollbar::value(int position, int size, int top, int total)</A>
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</H4>
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The first form returns the integer value of the scrollbar. You can get
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the floating point value with <TT>Fl_Slider::value()</TT>. The second
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form sets <TT>value()</TT>, <TT>range()</TT>, and <TT>slider_size()</TT>
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to make a variable-sized scrollbar. You should call this every time
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your window changes size, your data changes size, or your scroll
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position changes (even if in response to a callback from this
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2001-10-01 00:25:36 +04:00
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scrollbar). All necessary calls to <TT>redraw()</TT> are done. </BODY></HTML>
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