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14 <div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Handler"></a>OpenLayers.<wbr>Handler</h1><div class=CBody><p>Base class to construct a higher-level handler for event sequences. All handlers have activate and deactivate methods. In addition, they have methods named like browser events. When a handler is activated, any additional methods named like a browser event is registered as a listener for the corresponding event. When a handler is deactivated, those same methods are unregistered as event listeners.</p><p>Handlers also typically have a callbacks object with keys named like the abstracted events or event sequences that they are in charge of handling. The controls that wrap handlers define the methods that correspond to these abstract events - so instead of listening for individual browser events, they only listen for the abstract events defined by the handler.</p><p>Handlers are created by controls, which ultimately have the responsibility of making changes to the the state of the application. Handlers themselves may make temporary changes, but in general are expected to return the application in the same state that they found it.</p><!--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="#OpenLayers.Handler" >OpenLayers.<wbr>Handler</a></td><td class=SDescription>Base class to construct a higher-level handler for event sequences. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Handler.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Handler.control" >control</a></td><td class=SDescription>{<a href="Control-js.html#OpenLayers.Control" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>}. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Handler.keyMask" >keyMask</a></td><td class=SDescription>{Integer} Use bitwise operators and one or more of the OpenLayers.Handler constants to construct a keyMask. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Handler.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Handler.OpenLayers.Handler" >OpenLayers.<wbr>Handler</a></td><td class=SDescription>Construct a handler.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Handler.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Handler.activate" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">activate</a></td><td class=SDescription>Turn on the handler. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Handler.deactivate" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">deactivate</a></td><td class=SDescription>Turn off the handler. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Handler.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Handler.OpenLayers.Handler.MOD_NONE" >OpenLayers.<wbr>Handler.<wbr>MOD_NONE</a></td><td class=SDescription>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if any key is down.</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Handler.OpenLayers.Handler.MOD_SHIFT" >OpenLayers.<wbr>Handler.<wbr>MOD_SHIFT</a></td><td class=SDescription>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link5 onMouseOver="ShowTip(event, 'tt4', 'link5')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Shift is down.</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Handler.OpenLayers.Handler.MOD_CTRL" >OpenLayers.<wbr>Handler.<wbr>MOD_CTRL</a></td><td class=SDescription>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link6 onMouseOver="ShowTip(event, 'tt4', 'link6')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Ctrl is down.</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Handler.OpenLayers.Handler.MOD_ALT" >OpenLayers.<wbr>Handler.<wbr>MOD_ALT</a></td><td class=SDescription>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link7 onMouseOver="ShowTip(event, 'tt4', 'link7')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Alt is down.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
16 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.Properties"></a>Properties</h3></div></div>
18 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.control"></a>control</h3><div class=CBody><p>{<a href="Control-js.html#OpenLayers.Control" class=LClass id=link8 onMouseOver="ShowTip(event, 'tt1', 'link8')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>}. The control that initialized this handler. The control is assumed to have a valid map property - that map is used in the handler’s own setMap method.</p></div></div></div>
20 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.keyMask"></a>keyMask</h3><div class=CBody><p>{Integer} Use bitwise operators and one or more of the OpenLayers.Handler constants to construct a keyMask. The keyMask is used by <checkModifiers>. If the keyMask matches the combination of keys down on an event, checkModifiers returns true.</p><h4 class=CHeading>Example</h4><blockquote><pre>// handler only responds if the Shift key is down
21 handler.keyMask = OpenLayers.Handler.MOD_SHIFT;
23 // handler only responds if Ctrl-Shift is down
24 handler.keyMask = OpenLayers.Handler.MOD_SHIFT |
25 OpenLayers.Handler.MOD_CTRL;</pre></blockquote></div></div></div>
27 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.Constructor"></a>Constructor</h3></div></div>
29 <div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.OpenLayers.Handler"></a>OpenLayers.<wbr>Handler</h3><div class=CBody><p>Construct a handler.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>control</td><td class=CDLDescription>{<a href="Control-js.html#OpenLayers.Control" class=LClass id=link9 onMouseOver="ShowTip(event, 'tt1', 'link9')" onMouseOut="HideTip('tt1')">OpenLayers.Control</a>} The control that initialized this handler. The control is assumed to have a valid map property; that map is used in the handler’s own setMap method.</td></tr><tr><td class=CDLEntry>callbacks</td><td class=CDLDescription>{Object} An object whose properties correspond to abstracted events or sequences of browser events. The values for these properties are functions defined by the control that get called by the handler.</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} An optional object whose properties will be set on the handler.</td></tr></table></div></div></div>
31 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.Functions"></a>Functions</h3></div></div>
33 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.activate"></a>activate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>activate: function()</td></tr></table></blockquote><p>Turn on the handler. Returns false if the handler was already active.</p><h4 class=CHeading>Returns</h4><p>{Boolean} The handler was activated.</p></div></div></div>
35 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.deactivate"></a>deactivate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>deactivate: function()</td></tr></table></blockquote><p>Turn off the handler. Returns false if the handler was already inactive.</p><h4 class=CHeading>Returns</h4><p>{Boolean} The handler was deactivated.</p></div></div></div>
37 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.Constants"></a>Constants</h3></div></div>
39 <div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.OpenLayers.Handler.MOD_NONE"></a>OpenLayers.<wbr>Handler.<wbr>MOD_NONE</h3><div class=CBody><p>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link10 onMouseOver="ShowTip(event, 'tt4', 'link10')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if any key is down.</p></div></div></div>
41 <div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.OpenLayers.Handler.MOD_SHIFT"></a>OpenLayers.<wbr>Handler.<wbr>MOD_SHIFT</h3><div class=CBody><p>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link11 onMouseOver="ShowTip(event, 'tt4', 'link11')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Shift is down.</p></div></div></div>
43 <div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.OpenLayers.Handler.MOD_CTRL"></a>OpenLayers.<wbr>Handler.<wbr>MOD_CTRL</h3><div class=CBody><p>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link12 onMouseOver="ShowTip(event, 'tt4', 'link12')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Ctrl is down.</p></div></div></div>
45 <div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Handler.OpenLayers.Handler.MOD_ALT"></a>OpenLayers.<wbr>Handler.<wbr>MOD_ALT</h3><div class=CBody><p>If set as the <a href="#OpenLayers.Handler.keyMask" class=LProperty id=link13 onMouseOver="ShowTip(event, 'tt4', 'link13')" onMouseOut="HideTip('tt4')">keyMask</a>, <checkModifiers> returns false if Alt is down.</p></div></div></div>
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