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+/**
+ * $Id: mxDefaultKeyHandler.js,v 1.26 2010-01-02 09:45:15 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxDefaultKeyHandler
+ *
+ * Binds keycodes to actionnames in an editor. This aggregates an internal
+ * <handler> and extends the implementation of <mxKeyHandler.escape> to not
+ * only cancel the editing, but also hide the properties dialog and fire an
+ * <mxEditor.escape> event via <editor>. An instance of this class is created
+ * by <mxEditor> and stored in <mxEditor.keyHandler>.
+ * 
+ * Example:
+ * 
+ * Bind the delete key to the delete action in an existing editor.
+ * 
+ * (code)
+ * var keyHandler = new mxDefaultKeyHandler(editor);
+ * keyHandler.bindAction(46, 'delete');
+ * (end)
+ *
+ * Codec:
+ * 
+ * This class uses the <mxDefaultKeyHandlerCodec> to read configuration
+ * data into an existing instance. See <mxDefaultKeyHandlerCodec> for a
+ * description of the configuration format.
+ * 
+ * Keycodes:
+ * 
+ * See <mxKeyHandler>.
+ * 
+ * An <mxEvent.ESCAPE> event is fired via the editor if the escape key is
+ * pressed.
+ * 
+ * Constructor: mxDefaultKeyHandler
+ *
+ * Constructs a new default key handler for the <mxEditor.graph> in the
+ * given <mxEditor>. (The editor may be null if a prototypical instance for
+ * a <mxDefaultKeyHandlerCodec> is created.)
+ * 
+ * Parameters:
+ * 
+ * editor - Reference to the enclosing <mxEditor>.
+ */
+function mxDefaultKeyHandler(editor)
+{
+	if (editor != null)
+	{
+		this.editor = editor;
+		this.handler = new mxKeyHandler(editor.graph);
+		
+		// Extends the escape function of the internal key
+		// handle to hide the properties dialog and fire
+		// the escape event via the editor instance
+		var old = this.handler.escape;
+		
+		this.handler.escape = function(evt)
+		{
+			old.apply(this, arguments);
+			editor.hideProperties();
+			editor.fireEvent(new mxEventObject(mxEvent.ESCAPE, 'event', evt));
+		};
+	}
+};
+	
+/**
+ * Variable: editor
+ *
+ * Reference to the enclosing <mxEditor>.
+ */
+mxDefaultKeyHandler.prototype.editor = null;
+
+/**
+ * Variable: handler
+ *
+ * Holds the <mxKeyHandler> for key event handling.
+ */
+mxDefaultKeyHandler.prototype.handler = null;
+
+/**
+ * Function: bindAction
+ *
+ * Binds the specified keycode to the given action in <editor>. The
+ * optional control flag specifies if the control key must be pressed
+ * to trigger the action.
+ *
+ * Parameters:
+ *
+ * code - Integer that specifies the keycode.
+ * action - Name of the action to execute in <editor>.
+ * control - Optional boolean that specifies if control must be pressed.
+ * Default is false.
+ */
+mxDefaultKeyHandler.prototype.bindAction = function (code, action, control)
+{
+	var keyHandler = mxUtils.bind(this, function()
+	{
+		this.editor.execute(action);
+	});
+
+	// Binds the function to control-down keycode
+	if (control)
+	{
+		this.handler.bindControlKey(code, keyHandler);
+	}
+
+	// Binds the function to the normal keycode
+	else
+	{
+		this.handler.bindKey(code, keyHandler);				
+	}
+};
+
+/**
+ * Function: destroy
+ *
+ * Destroys the <handler> associated with this object. This does normally
+ * not need to be called, the <handler> is destroyed automatically when the
+ * window unloads (in IE) by <mxEditor>.
+ */
+mxDefaultKeyHandler.prototype.destroy = function ()
+{
+	this.handler.destroy();
+	this.handler = null;
+};