79 lines
2.5 KiB
HTML
79 lines
2.5 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_Scrollbar">class Fl_Scrollbar</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_Slider">Fl_Slider</a>
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+----<b>Fl_Scrollbar</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_Scrollbar.H>
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</pre></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
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<tt>FL_SHORTCUT</tt> events: the arrows move by <tt>linesize()</tt>,
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and vertical scrollbars take Page Up/Down (they move by the page size
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minus <tt>linesize()</tt>) and Home/End (they jump to the top or
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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>.
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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>
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<li><a href="#Fl_Scrollbar.~Fl_Scrollbar">~Fl_Scrollbar</a>
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<li><a href="#Fl_Scrollbar.linesize">linesize</a>
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<li><a href="#Fl_Scrollbar.value">value</a>
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</ul>
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<h4><a name="Fl_Scrollbar.Fl_Scrollbar">Fl_Scrollbar::Fl_Scrollbar(int x, 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 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<br>
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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()<br>
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int Fl_Scrollbar::value(int position, int size, int top, int total)</a></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>.
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The second form sets <tt>value()</tt>, <tt>range()</tt>, and
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<tt>slider_size()</tt> to make a variable-sized scrollbar. You should
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call this every time your window changes size, your data changes size,
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or your scroll position changes (even if in response to a callback from
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this scrollbar). All necessary calls to <tt>redraw()</tt> are done.
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</body>
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</html>
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