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Figure 2-2. Properties for DataBindingUnderTheHood application Under src/generated package, you will find all the files that got created and are normally invisible to you, as shown in Figure 2-3.
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Figure 2-3. Package explorer showing files generated by mxmlc
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Take a look at some of the code that gets generated to create the binding. This is the _DataBindingUnderTheHoodWatcherSetupUtil class.
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// writeWatcher id=3 shouldWriteSelf=true class=flex2.compiler.as3.binding.PropertyWatcher shouldWriteChildren=true watchers[3] = new mx.binding.PropertyWatcher("textInput1", { propertyChange: true } , // writeWatcherListeners id=3 size=1 [ bindings[2] ], propertyGetter); // writeWatcher id=4 shouldWriteSelf=true class=flex2.compiler.as3.binding.PropertyWatcher shouldWriteChildren=true watchers[4] = new mx.binding.PropertyWatcher("text", { textChanged: true, change: true }, // writeWatcherListeners id=4 size=1 [ bindings[2] ], null); // writeWatcher id=0 shouldWriteSelf=true class=flex2.compiler.as3.binding.PropertyWatcher shouldWriteChildren=true watchers[0] = new mx.binding.PropertyWatcher("textInput2", { propertyChange: true }, // writeWatcherListeners id=0 size=1 [ bindings[0] ], propertyGetter); // writeWatcher id=1 shouldWriteSelf=true class=flex2.compiler.as3.binding.PropertyWatcher shouldWriteChildren=true watchers[1] = new mx.binding.PropertyWatcher("text", { textChanged: true, change: true }, // writeWatcherListeners id=1 size=1 [ bindings[0] ], null); // writeWatcher id=2 shouldWriteSelf=true class=flex2.compiler.as3.binding.PropertyWatcher shouldWriteChildren=true watchers[2] = new mx.binding.PropertyWatcher("text", { propertyChange: true }, // writeWatcherListeners id=2 size=1 [ bindings[1] ], propertyGetter);
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The previous example shows that properties get binding using the PropertyWatcher method, which looks for changes in the data. Additionally, the mxmlc 4.0 compiler creates the dataBindingUnderTheHood-generated.as class and using the IWatcherSetupUtil interface class it calls the setup method that enable data binding.
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if (_watcherSetupUtil == null) { var watcherSetupUtilClass:Object = getDefinitionByName("_DataBindingUnderTheHoodWatcherSetupUtil"); watcherSetupUtilClass["init"](null); } _watcherSetupUtil.setup(this, function(propertyName:String):* { return target[propertyName]; }, function(propertyName:String):* { return DataBindingUnderTheHood[propertyName]; }, bindings, watchers); mx_internal::_bindings = mx_internal::_bindings.concat(bindings); mx_internal::_watchers = mx_internal::_watchers.concat(watchers);
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dataBindingUnderTheHood-generated.as also sets the binding through the mx.binding.BindingManager, which calls the UIComponent executeBindings to ensure binding is done through the life cycle of the component.
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private function _DataBindingUnderTheHood_TextInput1_i() : spark.components.TextInput
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{ var temp : spark.components.TextInput = new spark.components.TextInput(); temp.id = "textInput1"; temp.id = "textInput1"; if (!temp.document) temp.document = this; textInput1 = temp; mx.binding.BindingManager.executeBindings(this, "textInput1", textInput1); return temp; } private function _DataBindingUnderTheHood_TextInput2_i() : spark.components.TextInput { var temp : spark.components.TextInput = new spark.components.TextInput(); temp.id = "textInput2"; temp.id = "textInput2"; if (!temp.document) temp.document = this; textInput2 = temp; mx.binding.BindingManager.executeBindings(this, "textInput2", textInput2); return temp; }
// binding mgmt private function _DataBindingUnderTheHood_bindingsSetup():Array { var result:Array = []; result[0] = new mx.binding.Binding(this, function():String { var result:* = textInput2.text; return (result == undefined null : String(result)); }, null, "textInput1.text" ); result[1] = new mx.binding.Binding(this, function():String { var result:* = (text); return (result == undefined null : String(result)); }, null, "textInput2.text" ); result[2] = new mx.binding.Binding(this, function():* {
return textInput1.text;
}, function(_sourceFunctionReturnValue:*):void { textInput2.text = _sourceFunctionReturnValue; }, "textInput2.text" ); result[2].twoWayCounterpart = result[0]; result[0].twoWayCounterpart = result[2]; return result; } /** * @private **/ public static function set watcherSetupUtil(watcherSetupUtil:IWatcherSetupUtil2):void { (DataBindingUnderTheHood)._watcherSetupUtil = watcherSetupUtil; }
dataBindingUnderTheHood-binding-generated.as creates a class to behave as a wrapper for the UIComponent property. We will explain this code in more detail when we cover implicit data binding.
import import import import import import import flash.events.Event; flash.events.EventDispatcher; flash.events.IEventDispatcher; mx.core.IPropertyChangeNotifier; mx.events.PropertyChangeEvent; mx.utils.ObjectProxy; mx.utils.UIDUtil;
import spark.components.TextInput; class BindableProperty { /** * generated bindable wrapper for property textInput1 (public) * - generated setter * - generated getter * - original public var 'textInput1' moved to '_1559985460textInput1' */ [Bindable(event="propertyChange")] public function get textInput1():spark.components.TextInput { return this._1559985460textInput1; } public function set textInput1(value:spark.components.TextInput):void { var oldValue:Object = this._1559985460textInput1;
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if (oldValue !== value) { this._1559985460textInput1 = value; this.dispatchEvent(mx.events.PropertyChangeEvent.createUpdateEvent(this, "textInput1", oldValue, value)); } } /** * generated bindable wrapper for property textInput2 (public) * - generated setter * - generated getter * - original public var 'textInput2' moved to '_1559985461textInput2' */ [Bindable(event="propertyChange")] public function get textInput2():spark.components.TextInput { return this._1559985461textInput2; } public function set textInput2(value:spark.components.TextInput):void { var oldValue:Object = this._1559985461textInput2; if (oldValue !== value) { this._1559985461textInput2 = value; this.dispatchEvent(mx.events.PropertyChangeEvent.createUpdateEvent(this, "textInput2", oldValue, value)); } } }
As you can see, the magic is actually a lot of code that the mxmlc compiler creates on your behalf. All the code you have seen gets added to your application swf and is an overhead added every time you initialize your application. Creating one data binding using the curly brace doesn t make any difference, however, when you have many binding tags in an application it can cost you when the user starts the applications. In fact, in tests we created we found out that 10,000 MXML binding tags cost about 0.6 second.
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