Flex verification-submit mode source code parsing

1. Set component attributes

The following code is available in the component:

Public Function set XXX (value): void {

If (this. _ XXX! = Value ){

This. _ xxx = value;

Invalidateproerties ();

}

}

1. Call the invalidateproperties method of the uicomponent class:

public function invalidateProperties():void    {        if (!invalidatePropertiesFlag)        {            invalidatePropertiesFlag = true;            if (nestLevel && UIComponentGlobals.layoutManager)                UIComponentGlobals.layoutManager.invalidateProperties(this);        }    }

2. As shown in the code above, use the invalidateproperties method of layoutmanager

 public function invalidateProperties(obj:ILayoutManagerClient ):void    {        if (!invalidatePropertiesFlag && systemManager)        {            invalidatePropertiesFlag = true;            if (!listenersAttached)                attachListeners(systemManager);        }        // trace("LayoutManager adding " + Object(obj) + " to invalidatePropertiesQueue");        if (targetLevel <= obj.nestLevel)            invalidateClientPropertiesFlag = true;        invalidatePropertiesQueue.addObject(obj, obj.nestLevel);        // trace("LayoutManager added " + Object(obj) + " to invalidatePropertiesQueue");    }

3. The attachlisteners method adds a listener to systemmanager.

public function attachListeners(systemManager:ISystemManager):void    {        if (!waitedAFrame)        {            systemManager.addEventListener(Event.ENTER_FRAME, waitAFrame);        }        else        {            systemManager.addEventListener(Event.ENTER_FRAME, doPhasedInstantiationCallback);            if (!usePhasedInstantiation)            {                if (systemManager && (systemManager.stage || usingBridge(systemManager)))                {                    systemManager.addEventListener(Event.RENDER, doPhasedInstantiationCallback);                    if (systemManager.stage)                        systemManager.stage.invalidate();                }            }        }        listenersAttached = true;    }

4. Callback when the render event is triggered

 private function doPhasedInstantiationCallback(event:Event):void    {        // if our background processing is suspended, then we shouldn't do any         // validation        if (UIComponentGlobals.callLaterSuspendCount > 0)            return;                systemManager.removeEventListener(Event.ENTER_FRAME, doPhasedInstantiationCallback);        systemManager.removeEventListener(Event.RENDER, doPhasedInstantiationCallback);        if (!UIComponentGlobals.catchCallLaterExceptions)        {            doPhasedInstantiation();        }        else        {            try            {                doPhasedInstantiation();            }            catch(e:Error)            {                // Dispatch a callLaterError dynamic event for Design View.                 var callLaterErrorEvent:DynamicEvent = new DynamicEvent("callLaterError");                callLaterErrorEvent.error = e;                callLaterErrorEvent.source = this; callLaterErrorEvent.object = currentObject;                systemManager.dispatchEvent(callLaterErrorEvent);            }        }currentObject = null;    }

 

private function doPhasedInstantiation():void    {        // trace(">>DoPhasedInstantation");        // If phasing, do only one phase: validateProperties(),        // validateSize(), or validateDisplayList().        if (usePhasedInstantiation)        {            if (invalidatePropertiesFlag)            {                validateProperties();                // The Preloader listens for this event.                systemManager.document.dispatchEvent(                    new Event("validatePropertiesComplete"));            }            else if (invalidateSizeFlag)            {                validateSize();                // The Preloader listens for this event.                systemManager.document.dispatchEvent(                    new Event("validateSizeComplete"));            }            else if (invalidateDisplayListFlag)            {                validateDisplayList();                // The Preloader listens for this event.                systemManager.document.dispatchEvent(                    new Event("validateDisplayListComplete"));            }        }        // Otherwise, do one pass of all three phases.        else        {            if (invalidatePropertiesFlag)                validateProperties();            if (invalidateSizeFlag)                validateSize();            if (invalidateDisplayListFlag)                validateDisplayList();        }        // trace("invalidatePropertiesFlag " + invalidatePropertiesFlag);        // trace("invalidateSizeFlag " + invalidateSizeFlag);        // trace("invalidateDisplayListFlag " + invalidateDisplayListFlag);        if (invalidatePropertiesFlag ||            invalidateSizeFlag ||            invalidateDisplayListFlag)        {            attachListeners(systemManager);        }        else        {            usePhasedInstantiation = false;listenersAttached = false;var obj:ILayoutManagerClient = ILayoutManagerClient(updateCompleteQueue.removeLargest());            while (obj)            {                if (!obj.initialized && obj.processedDescriptors)                    obj.initialized = true;                if (obj.hasEventListener(FlexEvent.UPDATE_COMPLETE))                    obj.dispatchEvent(new FlexEvent(FlexEvent.UPDATE_COMPLETE));                obj.updateCompletePendingFlag = false;                obj = ILayoutManagerClient(updateCompleteQueue.removeLargest());            }            // trace("updateComplete");            dispatchEvent(new FlexEvent(FlexEvent.UPDATE_COMPLETE));        }        // trace("<<DoPhasedInstantation");    }

Note:

1. After the component calls the invalidateproperties () method, it calls the invalideproperties () of uicomponent ().

2. Call the invalidateproperties () method of layoutmanager.

3. Add a render event to systemmanager (this event can be triggered only when stage. invalidate () is required). This event is called when the display list is updated and displayed in the future.

4. After the render event is triggered, call the validateproperties () method of uicomponent.

5. Call the commitproperties () method. This method is usually rewritten when a custom component is used to delay verification-submission to this method. Rewrite some attributes to achieve partial refresh. For example:

override      protected      function commitProperties(): void      {      super.commitProperties();      if (sourceChanged){      if (! this.image){     image =  new Image();        this.addChild(image);     image.source =  this._source;        } else {     image.source =  this._source;      }     sourceChanged =  false ;      }      if (scaleChanged){      this.imageWidth =  this.imageWidth *   this.scale;      this.imageHeight =  this.imageHeight *+  this.scale;     scaleChanged =  false ;      }         }  

 

 

Invalidatesize ----> measure and invalidatedisplaylist --------> the updatedisplaylist process is the same as the preceding process.