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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>12 Flushing</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">▼</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Graphics:<span class="mywbr"> </span> Legacy Library</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="Basic_Commands.html" class="tocviewlink" data-pltdoc="x">Basic Commands</a></td></tr><tr><td align="right">2 </td><td><a href="posn.html" class="tocviewlink" data-pltdoc="x">Position Operations</a></td></tr><tr><td align="right">3 </td><td><a href="Color_Operations.html" class="tocviewlink" data-pltdoc="x">Color Operations</a></td></tr><tr><td align="right">4 </td><td><a href="Draw__Clear__and_Flip_Operations.html" class="tocviewlink" data-pltdoc="x">Draw, Clear, and Flip Operations</a></td></tr><tr><td align="right">5 </td><td><a href="World_Operations.html" class="tocviewlink" data-pltdoc="x">World Operations</a></td></tr><tr><td align="right">6 </td><td><a href="Miscellaneous_Operations.html" class="tocviewlink" data-pltdoc="x">Miscellaneous Operations</a></td></tr><tr><td align="right">7 </td><td><a href="An_Example.html" class="tocviewlink" data-pltdoc="x">An Example</a></td></tr><tr><td align="right">8 </td><td><a href="A_More_Complicated_Example.html" class="tocviewlink" data-pltdoc="x">A More Complicated Example</a></td></tr><tr><td align="right">9 </td><td><a href="Protecting_Graphics_Operations.html" class="tocviewlink" data-pltdoc="x">Protecting Graphics Operations</a></td></tr><tr><td align="right">10 </td><td><a href="Mouse_Operations.html" class="tocviewlink" data-pltdoc="x">Mouse Operations</a></td></tr><tr><td align="right">11 </td><td><a href="Keyboard_Operations.html" class="tocviewlink" data-pltdoc="x">Keyboard Operations</a></td></tr><tr><td align="right">12 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Flushing</a></td></tr><tr><td align="right">13 </td><td><a href="Graphics_Library_as_a_Unit.html" class="tocviewlink" data-pltdoc="x">Graphics Library as a Unit</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._graphics%2Fgraphics..rkt%29._viewport-flush-input%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">viewport-<wbr></wbr>flush-<wbr></wbr>input</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="Keyboard_Operations.html" title="backward to "11 Keyboard Operations"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Graphics: Legacy Library"" data-pltdoc="x">up</a> <a href="Graphics_Library_as_a_Unit.html" title="forward to "13 Graphics Library as a Unit"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "graphics/scribblings/graphics.scrbl")" x-part-tag=""Flushing"">12<tt> </tt><a name="(part._.Flushing)"></a>Flushing</h3><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._graphics/graphics..rkt)._viewport-flush-input))"></a><span title="Provided from: graphics/graphics | Package: htdp-lib"><span class="RktSym"><a href="#%28def._%28%28lib._graphics%2Fgraphics..rkt%29._viewport-flush-input%29%29" class="RktValDef RktValLink" data-pltdoc="x">viewport-flush-input</a></span></span><span class="hspace"> </span><span class="RktVar">viewport</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">viewport</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="Basic_Commands.html#%28def._%28%28lib._graphics%2Fgraphics..rkt%29._viewport~3f%29%29" class="RktValLink" data-pltdoc="x">viewport?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Empties all mouse and keyboard events in the input buffer of
<span class="RktVar">viewport</span>.</div></p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="Keyboard_Operations.html" title="backward to "11 Keyboard Operations"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Graphics: Legacy Library"" data-pltdoc="x">up</a> <a href="Graphics_Library_as_a_Unit.html" title="forward to "13 Graphics Library as a Unit"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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