new Files

front/public/vender/signature/jSignature.UndoButton.js

@@ -0,0 +1,165 @@
+/** @license
+jSignature v2 jSignature's Undo Button and undo functionality plugin
+
+*/
+/**
+Copyright (c) 2011 Willow Systems Corp http://willow-systems.com
+MIT License <http://www.opensource.org/licenses/mit-license.php>
+*/
+
+;(function(){
+
+	var apinamespace = 'jSignature'
+
+	function attachHandlers(buttonRenderer, apinamespace, extensionName) {
+		var $undoButton = buttonRenderer.call(this)
+
+		;(function(jSignatureInstance, $undoButton, apinamespace) {
+			jSignatureInstance.events.subscribe(
+				apinamespace + '.change'
+				, function(){
+					if (jSignatureInstance.dataEngine.data.length) {
+						$undoButton.show()
+					} else {
+						$undoButton.hide()
+					}
+				}
+			)
+		})( this, $undoButton, apinamespace )
+
+		;(function(jSignatureInstance, $undoButton, apinamespace) {
+
+			var eventName = apinamespace + '.undo'
+
+			$undoButton.bind('click', function(){
+				jSignatureInstance.events.publish(eventName)
+			})
+
+			// This one creates new "undo" event listener to jSignature instance
+			// It handles the actual undo-ing.
+			jSignatureInstance.events.subscribe(
+				eventName
+				, function(){
+					var data = jSignatureInstance.dataEngine.data
+					if (data.length) {
+						data.pop()
+						jSignatureInstance.resetCanvas(data)
+					}
+				}
+			)
+		})( 
+			this
+			, $undoButton
+			, this.events.topics.hasOwnProperty( apinamespace + '.undo' ) ? 
+				// oops, seems some other plugin or code has already claimed "jSignature.undo" event
+				// we will use this extension's name for event name prefix
+				extensionName :
+				// Great! we will use 'jSignature' for event name prefix.
+				apinamespace
+		)
+	}
+
+	function ExtensionInitializer(extensionName){
+		// we are called very early in instance's life.
+		// right after the settings are resolved and 
+		// jSignatureInstance.events is created 
+		// and right before first ("jSignature.initializing") event is called.
+		// You don't really need to manupilate 
+		// jSignatureInstance directly, just attach
+		// a bunch of events to jSignatureInstance.events
+		// (look at the source of jSignatureClass to see when these fire)
+		// and your special pieces of code will attach by themselves.
+
+		// this function runs every time a new instance is set up.
+		// this means every var you create will live only for one instance
+		// unless you attach it to something outside, like "window."
+		// and pick it up later from there.
+
+		// when globalEvents' events fire, 'this' is globalEvents object
+		// when jSignatureInstance's events fire, 'this' is jSignatureInstance
+
+		// Here,
+		// this = is new jSignatureClass's instance.
+
+		// The way you COULD approch setting this up is:
+		// if you have multistep set up, attach event to "jSignature.initializing"
+		// that attaches other events to be fired further lower the init stream.
+		// Or, if you know for sure you rely on only one jSignatureInstance's event,
+		// just attach to it directly
+
+		var apinamespace = 'jSignature'
+
+		this.events.subscribe(
+			// name of the event
+			apinamespace + '.attachingEventHandlers'
+			// event handlers, can pass args too, but in majority of cases,
+			// 'this' which is jSignatureClass object instance pointer is enough to get by.
+			, function(){
+
+				// hooking up "undo" button	to lower edge of Canvas.
+				// but only when options passed to jSignature('init', options)
+				// contain "undoButton":renderingFunction pair.
+				// or "undoButton":true (in which case default, internal rendering fn is used)
+				if (this.settings[extensionName]) {
+					var oursettings = this.settings[extensionName]
+					if (typeof oursettings !== 'function') {
+						// we make it a function.
+
+						// we allow people to override the button rendering code,
+						// but when developler is OK with default look (and just passes "truthy" value)
+						// this defines default look for the button:
+						// centered against canvas, hanging on its lower side.
+						oursettings = function(){
+							// this === jSignatureInstance 
+							var undoButtonSytle = 'position:absolute;display:none;margin:0 !important;top:auto'
+							, $undoButton = $('<input type="button" value="撤销" style="'+undoButtonSytle+'" />')
+								.appendTo(this.$controlbarLower)
+
+							// this centers the button against the canvas.
+							var buttonWidth = $undoButton.width()
+							$undoButton.css(
+								'left'
+								, Math.round(( this.canvas.width - buttonWidth ) / 2)
+							)
+							// IE 7 grows the button. Correcting for that.
+							if ( buttonWidth !== $undoButton.width() ) {
+								$undoButton.width(buttonWidth)
+							}
+
+							return $undoButton
+						}
+					}
+
+					attachHandlers.call( 
+						this
+						, oursettings
+						, apinamespace
+						, extensionName
+					)
+				}
+			}
+		)
+	}
+
+	var ExtensionAttacher = function(){
+		$.fn[apinamespace](
+			'addPlugin'
+			,'instance' // type of plugin
+			,'UndoButton' // extension name
+			,ExtensionInitializer
+		)
+	}
+	
+
+//  //Because plugins are minified together with jSignature, multiple defines per (minified) file blow up and dont make sense
+//	//Need to revisit this later.
+	
+//	if ( typeof define === "function" && define.amd != null) {
+//		// AMD-loader compatible resource declaration
+//		// you need to call this one with jQuery as argument.
+//		define(function(){return Initializer} )
+//	} else {
+		ExtensionAttacher()
+//	}
+
+})();