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<div class="refentry" title="FLscroll">
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<h2>
<span class="refentrytitle">FLscroll</span>
</h2>
<p>FLscroll —
A FLTK opcode that adds scroll bars to an area.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp21702256"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>FLscroll</em></span> adds scroll bars to an area.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp21703056"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>FLscroll</strong></span> iwidth, iheight [, ix] [, iy]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp21696864"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iwidth</em></span> -- width of widget.
</p>
<p>
<span class="emphasis"><em>iheight</em></span> -- height of widget.
</p>
<p>
<span class="emphasis"><em>ix</em></span> (optional) -- horizontal position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
</p>
<p>
<span class="emphasis"><em>iy</em></span> (optional) -- vertical position of upper left corner of the valuator, relative to the upper left corner of corresponding window (expressed in pixels).
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp21780328"></a>
<h2>Performance</h2>
<p>
Containers are useful to format the graphic appearance of the widgets. The most important container is <a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a>, that actually creates a window. It can be filled with other containers and/or valuators or other kinds of widgets.
</p>
<p>
There are no k-rate arguments in containers.
</p>
<p>
<span class="emphasis"><em>FLscroll</em></span> adds scroll bars to an area. Normally you must set arguments <span class="emphasis"><em>iwidth</em></span> and <span class="emphasis"><em>iheight</em></span> equal to that of the parent window or other parent container. <span class="emphasis"><em>ix</em></span> and <span class="emphasis"><em>iy</em></span> are optional since they normally are set to zero. For example the following code:
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="opc">FLpanel</span> "PanelPluto",400,300,100,100
<span class="opc">FLscroll</span> 400,300
gk1, ih1 <span class="opc">FLslider</span> "FLslider 1", 500, 1000, 2 ,1, -1, 300,15, 20,50
gk2, ih2 <span class="opc">FLslider</span> "FLslider 2", 300, 5000, 2 ,3, -1, 300,15, 20,100
gk3, ih3 <span class="opc">FLslider</span> "FLslider 3", 350, 1000, 2 ,5, -1, 300,15, 20,150
gk4, ih4 <span class="opc">FLslider</span> "FLslider 4", 250, 5000, 1 ,11,-1, 300,30, 20,200
<span class="opc">FLscrollEnd</span>
<span class="opc">FLpanelEnd</span></pre>
</div>
<p>
will show scroll bars, when the main window size is reduced:
</p>
<div class="mediaobject">
<img src="images/flscroll.png" alt="FLscroll." />
<div class="caption">
<p>FLscroll.</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp21788392"></a>
<h2>Examples</h2>
<p>
Here is an example of the FLscroll opcode. It uses the file <a class="ulink" href="examples/FLscroll.csd" target="_top"><em class="citetitle">FLscroll.csd</em></a>.
</p>
<div class="example">
<a id="idp21789376"></a>
<p class="title">
<strong>Example 255. Example of the FLscroll opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o FLscroll.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Demonstration of the flscroll opcode which enables</span>
<span class="comment">; the use of widget sizes and placings beyond the</span>
<span class="comment">; dimensions of the containing panel</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 441
<span class="ohdr">ksmps</span> <span class="op">=</span> 100
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="opc">FLpanel</span> "Text Box", 420, 200, 50, 50
iwidth <span class="op">=</span> 420
iheight <span class="op">=</span> 200
ix <span class="op">=</span> 0
iy <span class="op">=</span> 0
<span class="opc">FLscroll</span> iwidth, iheight, ix, iy
ih3 <span class="opc">FLbox</span> "DRAG THE SCROLL BAR TO THE RIGHT IN ORDER TO READ THE REST OF THIS TEXT!", 1, 10, 20, 870, 30, 10, 100
<span class="opc">FLscrollEnd</span>
<span class="comment">; End of panel contents</span>
<span class="opc">FLpanelEnd</span>
<span class="comment">; Run the widget thread!</span>
<span class="opc">FLrun</span>
<span class="oblock">instr</span> 1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; 'Dummy' score event of 1 hour.</span>
<span class="stamnt">f</span> 0 3600
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp21791656"></a>
<h2>See Also</h2>
<p>
<a class="link" href="FLgroup.html" title="FLgroup"><em class="citetitle">FLgroup</em></a>,
<a class="link" href="FLgroupEnd.html" title="FLgroupEnd"><em class="citetitle">FLgroupEnd</em></a>,
<a class="link" href="FLpack.html" title="FLpack"><em class="citetitle">FLpack</em></a>,
<a class="link" href="FLpackEnd.html" title="FLpackEnd"><em class="citetitle">FLpackEnd</em></a>,
<a class="link" href="FLpanel.html" title="FLpanel"><em class="citetitle">FLpanel</em></a>,
<a class="link" href="FLpanelEnd.html" title="FLpanelEnd"><em class="citetitle">FLpanelEnd</em></a>,
<a class="link" href="FLscrollEnd.html" title="FLscrollEnd"><em class="citetitle">FLscrollEnd</em></a>,
<a class="link" href="FLtabs.html" title="FLtabs"><em class="citetitle">FLtabs</em></a>,
<a class="link" href="FLtabsEnd.html" title="FLtabsEnd"><em class="citetitle">FLtabsEnd</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp21796512"></a>
<h2>Credits</h2>
<p>Author: Gabriel Maldonado</p>
<p>New in version 4.22</p>
<p>Example written by Iain McCurdy, edited by Kevin Conder.</p>
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