100 lines
54 KiB
HTML
100 lines
54 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
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<html><head><title>mxKeyHandler</title><link rel="stylesheet" type="text/css" href="../../styles/main.css"><script language=JavaScript src="../../javascript/main.js"></script><script language=JavaScript src="../../javascript/prettify.js"></script><script language=JavaScript src="../../javascript/searchdata.js"></script></head><body class="ContentPage" onLoad="NDOnLoad();prettyPrint();"><script language=JavaScript><!--
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<!-- Generated by Natural Docs, version 1.5 -->
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<!-- http://www.naturaldocs.org -->
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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="mxKeyHandler"></a>mxKeyHandler</h1><div class=CBody><p>Event handler that listens to keystroke events. This is not a singleton, however, it is normally only required once if the target is the document element (default).</p><p>This handler installs a key event listener in the topmost DOM node and processes all events that originate from descandants of <mxGraph.container> or from the topmost DOM node. The latter means that all unhandled keystrokes are handled by this object regardless of the focused state of the <a href="#mxKeyHandler.graph" class=LVariable id=link29 onMouseOver="ShowTip(event, 'tt2', 'link29')" onMouseOut="HideTip('tt2')">graph</a>.</p><h4 class=CHeading>Example</h4><p>The following example creates a key handler that listens to the delete key (46) and deletes the selection cells if the graph is enabled.</p><blockquote><pre class="prettyprint">var keyHandler = new mxKeyHandler(graph);
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keyHandler.bindKey(46, function(evt)
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{
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if (graph.isEnabled())
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{
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graph.removeCells();
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}
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});</pre></blockquote><h4 class=CHeading>Keycodes</h4><p>See <a href="http://tinyurl.com/yp8jgl" class=LURL target=_top>http://tinyurl.com/yp8jgl</a> or <a href="http://tinyurl.com/229yqw" class=LURL target=_top>http://tinyurl.com/229yqw</a> for a list of keycodes or install a key event listener into the document element and print the key codes of the respective events to the console.</p><p>To support the Command key and the Control key on the Mac, the following code can be used.</p><blockquote><pre class="prettyprint">keyHandler.getFunction = function(evt)
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{
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if (evt != null)
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{
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return (mxEvent.isControlDown(evt) || (mxClient.IS_MAC && evt.metaKey)) ? this.controlKeys[evt.keyCode] : this.normalKeys[evt.keyCode];
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}
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return null;
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};</pre></blockquote><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#mxKeyHandler" >mxKeyHandler</a></td><td class=SDescription>Event handler that listens to keystroke events. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#mxKeyHandler.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.mxKeyHandler" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">mxKeyHandler</a></td><td class=SDescription>Constructs an event handler that executes functions bound to specific keystrokes.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#mxKeyHandler.Variables" >Variables</a></td><td class=SDescription></td></tr><tr class="SVariable SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.graph" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">graph</a></td><td class=SDescription>Reference to the <a href="../view/mxGraph-js.html#mxGraph" class=LClass id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">mxGraph</a> associated with this handler.</td></tr><tr class="SVariable SIndent2"><td class=SEntry><a href="#mxKeyHandler.target" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">target</a></td><td class=SDescription>Reference to the target DOM, that is, the DOM node where the key event listeners are installed.</td></tr><tr class="SVariable SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.normalKeys" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">normalKeys</a></td><td class=SDescription>Maps from keycodes to functions for non-pressed control keys.</td></tr><tr class="SVariable SIndent2"><td class=SEntry><a href="#mxKeyHandler.shiftKeys" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">shiftKeys</a></td><td class=SDescription>Maps from keycodes to functions for pressed shift keys.</td></tr><tr class="SVariable SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.controlKeys" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">controlKeys</a></td><td class=SDescription>Maps from keycodes to functions for pressed control keys.</td></tr><tr class="SVariable SIndent2"><td class=SEntry><a href="#mxKeyHandler.controlShiftKeys" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">controlShiftKeys</a></td><td class=SDescription>Maps from keycodes to functions for pressed control and shift keys.</td></tr><tr class="SVariable SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.enabled" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">enabled</a></td><td class=SDescription>Specifies if events are handled. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#mxKeyHandler.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.isEnabled" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">isEnabled</a></td><td class=SDescription>Returns true if events are handled. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.setEnabled" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">setEnabled</a></td><td class=SDescription>Enables or disables event handling by updating <a href="#mxKeyHandler.enabled" class=LVariable id=link12 onMouseOver="ShowTip(event, 'tt9', 'link12')" onMouseOut="HideTip('tt9')">enabled</a>.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.bindKey" id=link13 onMouseOver="ShowTip(event, 'tt12', 'link13')" onMouseOut="HideTip('tt12')">bindKey</a></td><td class=SDescription>Binds the specified keycode to the given function. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.bindShiftKey" id=link14 onMouseOver="ShowTip(event, 'tt13', 'link14')" onMouseOut="HideTip('tt13')">bindShiftKey</a></td><td class=SDescription>Binds the specified keycode to the given function. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.bindControlKey" id=link15 onMouseOver="ShowTip(event, 'tt14', 'link15')" onMouseOut="HideTip('tt14')">bindControlKey</a></td><td class=SDescription>Binds the specified keycode to the given function. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.bindControlShiftKey" id=link16 onMouseOver="ShowTip(event, 'tt15', 'link16')" onMouseOut="HideTip('tt15')">bindControlShiftKey</a></td><td class=SDescription>Binds the specified keycode to the given function. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.isControlDown" id=link17 onMouseOver="ShowTip(event, 'tt16', 'link17')" onMouseOut="HideTip('tt16')">isControlDown</a></td><td class=SDescription>Returns true if the control key is pressed. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.getFunction" id=link18 onMouseOver="ShowTip(event, 'tt17', 'link18')" onMouseOut="HideTip('tt17')">getFunction</a></td><td class=SDescription>Returns the function associated with the given key event or null if no function is associated with the given event.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.isGraphEvent" id=link19 onMouseOver="ShowTip(event, 'tt18', 'link19')" onMouseOut="HideTip('tt18')">isGraphEvent</a></td><td class=SDescription>Returns true if the event should be processed by this handler, that is, if the event source is either the target, one of its direct children, a descendant of the <mxGraph.container>, or the <a href="../view/mxGraph-js.html#mxGraph.cellEditor" class=LVariable id=link20 onMouseOver="ShowTip(event, 'tt19', 'link20')" onMouseOut="HideTip('tt19')">mxGraph.cellEditor</a> of the <a href="#mxKeyHandler.graph" class=LVariable id=link21 onMouseOver="ShowTip(event, 'tt2', 'link21')" onMouseOut="HideTip('tt2')">graph</a>.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.keyDown" id=link22 onMouseOver="ShowTip(event, 'tt20', 'link22')" onMouseOut="HideTip('tt20')">keyDown</a></td><td class=SDescription>Handles the event by invoking the function bound to the respective keystroke if <a href="../view/mxGraph-js.html#mxGraph.isEnabled" class=LFunction id=link23 onMouseOver="ShowTip(event, 'tt21', 'link23')" onMouseOut="HideTip('tt21')">mxGraph.isEnabled</a>, <a href="#mxKeyHandler.isEnabled" class=LFunction id=link24 onMouseOver="ShowTip(event, 'tt10', 'link24')" onMouseOut="HideTip('tt10')">isEnabled</a> and <a href="#mxKeyHandler.isGraphEvent" class=LFunction id=link25 onMouseOver="ShowTip(event, 'tt18', 'link25')" onMouseOut="HideTip('tt18')">isGraphEvent</a> all return true for the given event and <a href="../view/mxGraph-js.html#mxGraph.isEditing" class=LFunction id=link26 onMouseOver="ShowTip(event, 'tt22', 'link26')" onMouseOut="HideTip('tt22')">mxGraph.isEditing</a> returns false. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#mxKeyHandler.escape" id=link27 onMouseOver="ShowTip(event, 'tt23', 'link27')" onMouseOut="HideTip('tt23')">escape</a></td><td class=SDescription>Hook to process ESCAPE keystrokes. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#mxKeyHandler.destroy" id=link28 onMouseOver="ShowTip(event, 'tt24', 'link28')" onMouseOut="HideTip('tt24')">destroy</a></td><td class=SDescription>Destroys the handler and all its references into the DOM. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
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<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.Functions"></a>Functions</h3></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.mxKeyHandler"></a>mxKeyHandler</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>function mxKeyHandler(</td><td class=PParameter nowrap>graph,</td></tr><tr><td></td><td class=PParameter nowrap>target</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Constructs an event handler that executes functions bound to specific keystrokes.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>graph</td><td class=CDLDescription>Reference to the associated <a href="../view/mxGraph-js.html#mxGraph" class=LClass id=link30 onMouseOver="ShowTip(event, 'tt3', 'link30')" onMouseOut="HideTip('tt3')">mxGraph</a>.</td></tr><tr><td class=CDLEntry>target</td><td class=CDLDescription>Optional reference to the event target. If null, the document element is used as the event target, that is, the object where the key event listener is installed.</td></tr></table></div></div></div>
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<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.Variables"></a>Variables</h3></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.graph"></a>graph</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.graph</td></tr></table></blockquote><p>Reference to the <a href="../view/mxGraph-js.html#mxGraph" class=LClass id=link31 onMouseOver="ShowTip(event, 'tt3', 'link31')" onMouseOut="HideTip('tt3')">mxGraph</a> associated with this handler.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.target"></a>target</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.target</td></tr></table></blockquote><p>Reference to the target DOM, that is, the DOM node where the key event listeners are installed.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.normalKeys"></a>normalKeys</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.normalKeys</td></tr></table></blockquote><p>Maps from keycodes to functions for non-pressed control keys.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.shiftKeys"></a>shiftKeys</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.shiftKeys</td></tr></table></blockquote><p>Maps from keycodes to functions for pressed shift keys.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.controlKeys"></a>controlKeys</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.controlKeys</td></tr></table></blockquote><p>Maps from keycodes to functions for pressed control keys.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.controlShiftKeys"></a>controlShiftKeys</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.controlShiftKeys</td></tr></table></blockquote><p>Maps from keycodes to functions for pressed control and shift keys.</p></div></div></div>
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<div class="CVariable"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.enabled"></a>enabled</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.enabled</td></tr></table></blockquote><p>Specifies if events are handled. Default is true.</p></div></div></div>
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<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.Functions"></a>Functions</h3></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.isEnabled"></a>isEnabled</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.isEnabled = function()</td></tr></table></blockquote><p>Returns true if events are handled. This implementation returns <a href="#mxKeyHandler.enabled" class=LVariable id=link32 onMouseOver="ShowTip(event, 'tt9', 'link32')" onMouseOut="HideTip('tt9')">enabled</a>.</p></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.setEnabled"></a>setEnabled</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.setEnabled = function(</td><td class=PParameter nowrap>enabled</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Enables or disables event handling by updating <a href="#mxKeyHandler.enabled" class=LVariable id=link33 onMouseOver="ShowTip(event, 'tt9', 'link33')" onMouseOut="HideTip('tt9')">enabled</a>.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>enabled</td><td class=CDLDescription>Boolean that specifies the new enabled state.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.bindKey"></a>bindKey</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Binds the specified keycode to the given function. This binding is used if the control key is not pressed.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>code</td><td class=CDLDescription>Integer that specifies the keycode.</td></tr><tr><td class=CDLEntry>funct</td><td class=CDLDescription>JavaScript function that takes the key event as an argument.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.bindShiftKey"></a>bindShiftKey</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindShiftKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Binds the specified keycode to the given function. This binding is used if the shift key is pressed.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>code</td><td class=CDLDescription>Integer that specifies the keycode.</td></tr><tr><td class=CDLEntry>funct</td><td class=CDLDescription>JavaScript function that takes the key event as an argument.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.bindControlKey"></a>bindControlKey</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindControlKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Binds the specified keycode to the given function. This binding is used if the control key is pressed.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>code</td><td class=CDLDescription>Integer that specifies the keycode.</td></tr><tr><td class=CDLEntry>funct</td><td class=CDLDescription>JavaScript function that takes the key event as an argument.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.bindControlShiftKey"></a>bindControlShiftKey</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindControlShiftKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Binds the specified keycode to the given function. This binding is used if the control and shift key are pressed.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>code</td><td class=CDLDescription>Integer that specifies the keycode.</td></tr><tr><td class=CDLEntry>funct</td><td class=CDLDescription>JavaScript function that takes the key event as an argument.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.isControlDown"></a>isControlDown</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.isControlDown = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns true if the control key is pressed. This uses <a href="../util/mxEvent-js.html#mxEvent.isControlDown" class=LFunction id=link34 onMouseOver="ShowTip(event, 'tt25', 'link34')" onMouseOut="HideTip('tt25')">mxEvent.isControlDown</a>.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>Key event whose control key pressed state should be returned.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.getFunction"></a>getFunction</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.getFunction = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns the function associated with the given key event or null if no function is associated with the given event.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>Key event whose associated function should be returned.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.isGraphEvent"></a>isGraphEvent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.isGraphEvent = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns true if the event should be processed by this handler, that is, if the event source is either the target, one of its direct children, a descendant of the <mxGraph.container>, or the <a href="../view/mxGraph-js.html#mxGraph.cellEditor" class=LVariable id=link35 onMouseOver="ShowTip(event, 'tt19', 'link35')" onMouseOut="HideTip('tt19')">mxGraph.cellEditor</a> of the <a href="#mxKeyHandler.graph" class=LVariable id=link36 onMouseOver="ShowTip(event, 'tt2', 'link36')" onMouseOut="HideTip('tt2')">graph</a>.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>Key event that represents the keystroke.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.keyDown"></a>keyDown</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.keyDown = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Handles the event by invoking the function bound to the respective keystroke if <a href="../view/mxGraph-js.html#mxGraph.isEnabled" class=LFunction id=link37 onMouseOver="ShowTip(event, 'tt21', 'link37')" onMouseOut="HideTip('tt21')">mxGraph.isEnabled</a>, <a href="#mxKeyHandler.isEnabled" class=LFunction id=link38 onMouseOver="ShowTip(event, 'tt10', 'link38')" onMouseOut="HideTip('tt10')">isEnabled</a> and <a href="#mxKeyHandler.isGraphEvent" class=LFunction id=link39 onMouseOver="ShowTip(event, 'tt18', 'link39')" onMouseOut="HideTip('tt18')">isGraphEvent</a> all return true for the given event and <a href="../view/mxGraph-js.html#mxGraph.isEditing" class=LFunction id=link40 onMouseOver="ShowTip(event, 'tt22', 'link40')" onMouseOut="HideTip('tt22')">mxGraph.isEditing</a> returns false. If the graph is editing only the <enter> and <a href="#mxKeyHandler.escape" class=LFunction id=link41 onMouseOver="ShowTip(event, 'tt23', 'link41')" onMouseOut="HideTip('tt23')">escape</a> cases are handled by calling the respective hooks.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>Key event that represents the keystroke.</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.escape"></a>escape</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.escape = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Hook to process ESCAPE keystrokes. This implementation invokes <a href="../view/mxGraph-js.html#mxGraph.stopEditing" class=LFunction id=link42 onMouseOver="ShowTip(event, 'tt26', 'link42')" onMouseOut="HideTip('tt26')">mxGraph.stopEditing</a> to cancel the current editing, connecting and/or other ongoing modifications.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>Key event that represents the keystroke. Possible keycode in this case is 27 (ESCAPE).</td></tr></table></div></div></div>
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<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="mxKeyHandler.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.destroy = function()</td></tr></table></blockquote><p>Destroys the handler and all its references into the DOM. This does normally not need to be called, it is called automatically when the window unloads (in IE).</p></div></div></div>
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<div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>function mxKeyHandler(</td><td class=PParameter nowrap>graph,</td></tr><tr><td></td><td class=PParameter nowrap>target</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Constructs an event handler that executes functions bound to specific keystrokes.</div></div><div class=CToolTip id="tt2"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.graph</td></tr></table></blockquote>Reference to the mxGraph associated with this handler.</div></div><div class=CToolTip id="tt3"><div class=CClass>Extends mxEventSource to implement a graph component for the browser. </div></div><div class=CToolTip id="tt4"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.target</td></tr></table></blockquote>Reference to the target DOM, that is, the DOM node where the key event listeners are installed.</div></div><div class=CToolTip id="tt5"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.normalKeys</td></tr></table></blockquote>Maps from keycodes to functions for non-pressed control keys.</div></div><div class=CToolTip id="tt6"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.shiftKeys</td></tr></table></blockquote>Maps from keycodes to functions for pressed shift keys.</div></div><div class=CToolTip id="tt7"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.controlKeys</td></tr></table></blockquote>Maps from keycodes to functions for pressed control keys.</div></div><div class=CToolTip id="tt8"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.controlShiftKeys</td></tr></table></blockquote>Maps from keycodes to functions for pressed control and shift keys.</div></div><div class=CToolTip id="tt9"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.enabled</td></tr></table></blockquote>Specifies if events are handled. </div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.isEnabled = function()</td></tr></table></blockquote>Returns true if events are handled. </div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.setEnabled = function(</td><td class=PParameter nowrap>enabled</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Enables or disables event handling by updating enabled.</div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Binds the specified keycode to the given function. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindShiftKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Binds the specified keycode to the given function. </div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindControlKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Binds the specified keycode to the given function. </div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.bindControlShiftKey = function(</td><td class=PParameter nowrap>code,</td></tr><tr><td></td><td class=PParameter nowrap>funct</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Binds the specified keycode to the given function. </div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.isControlDown = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns true if the control key is pressed. </div></div><div class=CToolTip id="tt17"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.getFunction = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns the function associated with the given key event or null if no function is associated with the given event.</div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.isGraphEvent = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns true if the event should be processed by this handler, that is, if the event source is either the target, one of its direct children, a descendant of the mxGraph.container, or the mxGraph.cellEditor of the graph.</div></div><div class=CToolTip id="tt19"><div class=CVariable><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxGraph.prototype.cellEditor</td></tr></table></blockquote>Holds the mxCellEditor that is used as the in-place editing.</div></div><div class=CToolTip id="tt20"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.keyDown = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Handles the event by invoking the function bound to the respective keystroke if mxGraph.isEnabled, isEnabled and isGraphEvent all return true for the given event and mxGraph.isEditing returns false. </div></div><div class=CToolTip id="tt21"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxGraph.prototype.isEnabled = function()</td></tr></table></blockquote>Returns true if the graph is enabled.</div></div><div class=CToolTip id="tt22"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxGraph.prototype.isEditing = function(</td><td class=PParameter nowrap>cell</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns true if the given cell is currently being edited. </div></div><div class=CToolTip id="tt23"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxKeyHandler.prototype.escape = function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Hook to process ESCAPE keystrokes. </div></div><div class=CToolTip id="tt24"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td>mxKeyHandler.prototype.destroy = function()</td></tr></table></blockquote>Destroys the handler and all its references into the DOM. </div></div><div class=CToolTip id="tt25"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>isControlDown: function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns true if the control key is pressed for the given event.</div></div><div class=CToolTip id="tt26"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype prettyprint"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>mxGraph.prototype.stopEditing = function(</td><td class=PParameter nowrap>cancel</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Stops the current editing.</div></div><!--END_ND_TOOLTIPS-->
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