Flex :: Force 'updatedisplaylist' Immediately Rather Than At Later Some Point?
Jul 14, 2010
In flex component life cycle, after we make some change in a components property, invalidation methods schedules a call to methods like commitProperties, updateDisplayList, etc for some later time. I need to call the updateDisplayList instantaneously. Is there some direct way to do this.
Currently, both the labels are changed simultaneously after completion of the loop. Instead I need it to work like this, to first render the updated 'myButton1' label then enter the loop and then update myButton2's label. I know, it is elastic race track issue, but isn't there some way to achieve this ?[code]...
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Dec 1, 2009
Main class code starts only when swf is loaded. So I can't activate any preloader.
"Simulate download" mode shows "Frame 0".
How force SWF to start executing immediately?
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Jul 30, 2010
Overview: The code giving me the problem is deployed here: [URL] The problem I am running into is that a certain sequence of actions (I don't fully understand how or why) is causing my calls to invalidateDisplayList to fail to produce a subsequent call to updateDisplayList. What I know is that during this period, some other visual effects will fail to occur (such as changing the width of a component or the addition of a new child).
Example: The program below draws two columns of horizontal lines. The column on the left is drawn during commitProperties, the column on the right is drawn during updateDisplayList. A certain sequence of actions can cause the right column to stop updating.
To trigger this bug: First add a new item. Now hit the start button and a bar starts filling up. If you press the add row button, the right column and the filling bar both stop growing. The left column continues unfettered. The extra component won't appear until the last line of the if statement in TEComputeRow.tick() doesn't execute for a frame. Click on the stop button to halt the execution of the block inside the if statement in TEComputeRow.tick() and everything goes back to normal.
[Code]...
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Jun 24, 2011
I have a custom component which is an HBox & I'm trying to resize a child which happens to be an image. This is image is inside a VBox which is also a child of the HBox. I have a number of these images so In UpdateDisplayList I call:myimageArray[0-5].setActualSize(50,50);but the image is never resized it just stays a large default size. The images source is a url path and I'm wondering if that is what is causing the problem?
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Oct 14, 2010
I have an item renderer for a grid that has a fairly basic updateDisplayList function:
override protected function updateDisplayList( w : Number, h : Number ) : void
{
super.updateDisplayList( w, h );
var labelWidth : Number = Math.min( _labelDisplay.measuredWidth, w );
[Code]....
The next time I scroll the renders update to look like they should - but updateDisplayList is NOT called here (on the renderes). All that happens is that the renderers are re-positioned in the grid. Both the background and the label are displayed incorrectly initially so it's not just the label mis-behaving.
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Jan 5, 2012
I've created a custom MenuBar to make this happen. But it just doesn't seem to happen. It never renders any of the changes I made to the Graphics.What am I doing wrong?[code]
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Jan 6, 2012
So updateDisplayList is for laying out, positioning and sizing a component's children. It seems a waste to me, however, to have all that code running every time a render is called, even if no changes have been made to the relevant properties or child properties.The way I get around this for performance's sake (working on mobile) is to set a flag inside of my overridden updateDisplayList that lets a big part of my own sizing/positioning code run only the first time.Is this a bad idea/ big mistake? I just can't see the benefit to letting it run every time otherwise if I don't expect anything that affects sizing/positioning to change.
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Jul 19, 2010
I'm having a problem similar to [url]...
Basically, bmpd.draw and/or png.encode are dog slow, so I'd like to have a nice "please hold while we prepare your png" dialog to appear. I can't use callLater() because of the FileReference.
And just for good measure, the loading screen appears at the same time the save dialog appears from the call to fr.save().
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Sep 11, 2009
In an AIR application I have the following code:
theDialog = PopUpManager.createPopUp( this, TheDialogClass, true ) as TheDialogClass;
theDialog.addEventListener(FlexEvent.CREATION_COMPLETE, cpuIntensiveCalc);
At the end of cpuIntensiveCalc the dialog is removed. The dialog informs the user that "something is going on, please stand by."
The problem is that cpuIntensiveCalc starts before the dialog draws. So the user experience is that the application freezes for 10 seconds with no indicator, then the modal dialog flashes quickly (less than a second) on screen.
The Adobe docs say this about creation_complete
Dispatched when the component has finished its construction, property processing, measuring, layout, and drawing.
So this feels like the correct event. In the name of completeness, I also tried
theDialog = PopUpManager.createPopUp( this, TheDialogClass, true ) as TheDialogClass;
cpuIntensiveCalc();
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Apr 29, 2011
I need to make a function that execute a java method and return his result. It is static becouse a lot of other functions will call this function. So I did this:
public static function FKDescription(dest:String):String{
var jRemote:RemoteObject = new RemoteObject();
var s:String;
[Code].....
But the function returns null, because the valresult() was not been called at the end of main function. What shoud I do to make FKDescription() return the string that came from remoteobject?
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Jul 8, 2010
I have a two way binding between a loaded flash file and the main application in flex.
BindingUtils.bindProperty(this, "micGainValue", audioPublisherApp, "micVolume");
BindingUtils.bindProperty(audioPublisherApp, "micVolume", this, "micGainValue");
micGainValue=75;
[code]....
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Aug 14, 2009
I have a drag-and-drop event form in a flex project. I need to run a validator right after the item is dragged into the dataGrid. In it, I fire off a function through dragDrop="verifyEventUsers()". In the validator, I compare the contents of the two arrayCollections, but it appears to be running the checks prior to completion of the drop. For instance, if I drag an element into the dataGrid and trace eventUsers.length inside the validator, I get zero. When I drag the second element, it traces as one even though two lines now appear.
How can I set up a validation script that runs after the drag-drop action has finished?
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Sep 9, 2011
I am connecting to a BlazeDS server with a simple Flex component that is merely trying to subscribe to realtime dataHere are the Channels and Consumer
<mx:ChannelSet id="channelSet">
<mx:AMFChannel url="http://localhost:8080/MyApp/messagebroker/streamingamf/"/>
</mx:ChannelSet>
[code]....
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Mar 27, 2010
When i try to override the updateDisplayList to draw a backgroundImage for a tab navigator, the background does not fill till the end of the tab navigator. A space equal to the tab bar height does not get filled by the background. same is the case when I use an Image as backgroundImage. Any idea how to get this resolved?
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Jan 11, 2010
I have a situation where I need my swf to load from a domain. Currently my flex set up always loads a SWF from file [URL]...
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Feb 22, 2012
[Code]...
why throwing "Call to possible undefined function updateDisplayList"?
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Apr 4, 2010
My operation system is Window XP in Chinese. I'm running flex sdk > asdoc in command line. Asdoc picks up the system default language. How can I force it to be run in English language environment?
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Jan 10, 2011
I have an app w/ a login screen. When the user hits "enter", the state changes to "login" & a child component is triggered to load (though the child stays invisible at the moment). The child contains many functions that the user needs upon logging in (ie their screenname & settings are retrieved from a database). The following is included in 'Parent':
<local:comp id="localComp" includeIn="login" includeInLayout="false" visible="false"/>
<mx:Button label="login" click="currentState='login'"/>
<mx:Button label="logout" click="currentState='Default'"/>
My problem is when a user logs out (state changes to 'Default') & then logs back in (state changes back to 'login') the child doesn't get "triggered" again & the functions w/in the child don't reload. Is there a way to force my child to refresh?
Note: While it would be easier to just move the child's functions to the parent it is complex...I moved these functions to the child to make it easier to follow
UPDATE: I even tried adding an "exitState" to my state:
<s:State name="login" exitState="removeElement(localComp)" />
This doesn't work either, as I get an error: "RangeError: Index 0 is out of range."
UPDATE: Even though you are allowed to call a child's function from a parent, my problem is that the child needs to be "created" in order to not show errors. It makes no sense to me why the flex team would make something like removing & adding children so complicated.
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Jan 28, 2011
I'm using an iFrame in a Flex 3 project. The problem is that if the user opens my site in a small browser window, they don't get scrollbars. How can I solve this problem? Is there a way to force the browser to put up scrollbars?
If I set the main app to horizontalScrollPolicy="on" verticalScrollPolicy="on" or to "auto", then as you scroll down, the iFrame is stuck to the top of the browser window and obscures the content.
In the main app:
[Code].....
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Jul 22, 2009
I have a page-like flex application. In my main application is a holder (a canvas) that displays all the pages. The problem is that the components that are loaded inside the holder are bigger than the holder is when the main application starts. The holder height is set to 100% but still he gets scrollbars when I load a bigger component inside of him then himselHow can I solve this problem? And if it isn't solvable would it work correct if I use a viewstack?the holder looks like this:
<mx:canvas height="100%">
</canvas>
But the end of the application is 500 pixels lower so canvas height is 500 pixels high. Now I put a new child inside the holder that is 1000 pixels high.
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Jul 29, 2009
I have a Flex 3 app with a view in a viewstack, and that view must only be created when requested. I have declared validators for each of the controls on the view and I have created a method called checkAllValid() which runs Validator.validateAll(). This works great when I'm actually using the controls (using the change or focusOut events), but how can I get checkAllValid() to run when the view is first displayed to the user, so that they are immediately shown what is invalid once the data is populated in the controls?
I have tried putting the call in various events on the view itself (e.g. creationComplete, updateComplete, show, activate, etc.) but it always shows the following error when I start the application:
'The source attribute must be specified when the property attribute is specified.'
I have also tried setting the creationPolicy on the view to "all" but this does not help.
Some of the validators are only enabled when the form is in a certain state, but I have eliminated that as being the potential problem by commenting out all of my validators except for this most simple one:
[Code]....
I have also tried calling the single validator directly rather than using validateAll and the result is the same.
There must be a way I can force the view to validate when it is shown....
(by the way it's in the Cairngorm MVC framework and I have data bound to the controls)
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Oct 4, 2009
When I try to access the hidden TABs of my tab navigator control in action script, it returns a null error. But it works OK if I just activate the control in the user interface once. Obviously the control is not created until I use it. How do I make all the tabs automatically created by default ?
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Nov 24, 2009
I create a custom component to override the linkButton to make it behave that if an exist value is found, it would shown as "Added".
By default the button label is "Add to cart", I could not make the button become "Added" after trying many trial and error on uHandler which I suppose, COMPLETE, ENTER_FRAME, CREATION_COMPLETE could not even update the label.
public class Btn extends LinkButton{
public function Btn(){
super();
[Code]....
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Dec 15, 2009
Is there a way to make the datagrid scroll if it's width exceeds it's parent container (instead of making the parent container scroll?) I have a datagrid with a fixed column, and of course I want the scrollbar to appear for the datagrid and not the enclosing HBox. I already set minWidth of the HBox to 0, tried autoLayout=false, but with no effects. The datagrid is dynamically created in AS3, so the enclosing container.
Maybe I did not express my needs clearly - the content of the datagrid should not be wider than the datagrid itself. I just want to surrounding Canvas of the Datagrid to not have any scrollbars and let the datagrid itself scroll. But just setting the scrollpolicy to off on the Canvas will not yield to scrollbars on the datagrid, it will rather clip the data.
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Mar 5, 2010
I have an item renderer that checks an external source for display information. If that information changes, I want to force all item renderer instances to check it.
What's the best way for force all the item renderers in a list or grid to either commitProperties or execute some other method?
I've read that resetting the grid.itemRenderer property will make them all initialize. I've also received the suggestion to iterate recursively through all the grid's children and call invalidateProperties on all the UIComponents I find.
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Apr 6, 2010
I have item renderers in an mx.controls.Tree that I need to refresh on demand.
I have code in the updateDisplayList that fires for only some of the visible nodes no matter what I do. I've tried triggering a change that they should all be listening for; I have tried clearing and resetting the dataProvider and the itemRenderer properties.
private function forceCategoryTreeRefresh(event : Event = null) : void
{
trace("forceCategoryTreeRefresh");
[Code]....
The nodes refresh properly when I scroll them into view (e.g. the .data gets set), but I cannot force the ones that already exist to refresh or reset themselves.
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Mar 23, 2011
Suppose I have a component and want to change it's focus color at runtime. Here's an example for you (I've excluded any buttons and such to prevent component from losing it's focus, cause in that case it changes it's color perfectly):
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="init()">
<mx:Script><![CDATA[
private function init():void {
[Code].....
What do I want: How to make this focus to be redrawn without magic (I've tried all the methods, starting with "validate", I've tried calling updateDisplayList() on entire application, I've tried to call styleChanged .
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May 9, 2011
I have a function that is made up of two main parts (I'll call them A and B). Part B needs to run when part A is fully done with its layout changes. However, there is no "part A is done" signal, and thus I've been calling a validateNow() before part B runs. This works but seems awfully inefficient - was wondering if there are any other tricks to force an immediate measure or something along those lines or if I'm stuck.
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May 23, 2011
I have a MenuBar which opens downwards except when there isn't enough room to open it. For example, it may have 10 items but there's only enough room to display 4-5. Flex then tries to display the menu above the bar, which is completely off the screen. Is there some property or style I'm overlooking to always force it to open downward?
EDIT: Thought I'd give some clarification as to how I plan to circumvent the issue. If I can always force the menubar to be orientated downwards, I can make it into a scrollable menubar displaying only a few items at worst.
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Jul 11, 2011
Yesterday when playing a game (Balloons Tower Defense 3) I noticed that the game started to slow down over time and then randomly speed up very quickly. Looking at the memory usage dropping each time I assumed it was the GC running.
As a legitimate question, is there anyway to force Flash to GC from, say, Firefox? Perhaps there's an addon or a command you can run that will do this? I know that you can do System.gc() but this game isn't mine so I can't modify the source with a "Click here to GC" button.
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