I've read in the flex developer guide that you sometimes need to override one of the lifecycle methods like: commitProperties and updateDisplayList but I've written a few flex apps without ever needing to implement them.when do I need to override them?
View 2 RepliesI have following itemrenderer
[Code]...
My question is Should above logic go in updtaeDisplayList or remain in set data() itself. The output is smae from both. Whats the performance impact difference if we consider it from lifecycle perspective.(The heavy computations should be pushed towards the end of the frame rendering)
I've got a custom class that extends the Button UIComponent. I'm trying to override the drawEmphasized() function and a few public get/set functions. I get "1020: Method marked override must override another method." for each thing I try to override. The SWF that uses the custom button will compile and work, but I don't know if the failure is creating some of the strange behavior I see. The errors appear when I drag a component onstage, or save the FLA. This seems related:
View 7 RepliesI always have a question about override custom event. I am not sure why or what do to inside override function. I searched google but didn't get too many feedbacks. EDIT: My projects seem work fine even though I use my custom event without override. Anyone could explain it?
View 2 RepliesAs per the book, 'childAdd' event of parentcontainer should be triggered after triggering of 'PreInitialize' and 'Initialize' event of childcontianer while as per the program out put it seems otherwise.What I found in books is as below:
Container----------Component
Preinitialize
------------------Preinitialize[code].....
I have custom components which must adjust their text content based on space constraints. For example a component adds labels until there is no space, and then the content of the last label becomes "(x more)"
I do not have access to size of child controls before adding them. When in updateDisplayList, I make changes to the layout of the component, but for labels, lblInstance.text property fires events, which lead to updateDisplayList being called again. I know that updateDisplayList may be called more than once, but if there is a way to modify text without triggering events, that'd be really useful. For example, setActualSize method in UIComponent allows this kind of modification. Anything similar for text controls? Or do you have best practices for laying out and managing text content, in the context of custom Flex components?
Create a tab navigator (or viewstack, whatever) and add a couple tabs. On your tab add a show event handler. Inside the event handler call invalidateProperties() and invalidateDisplayList() on one of the children of your tab. Put a break point on the childs commitProperties() and updateDisplayList(). You'll notice that the updateDisplayList() gets called before commitProperties() which results in incorrect behaviour.
I noticed this problem when setting a DataGrid's dataprovider from inside the show handler. Setting the dataProvider causes the grid to invalidate both properties and displayList, updateDisplayList() will get called first, then commitProperties() which will result in the grid not updating the rows. It appears the root of the problem is that the show event gets dispatched from within LayoutManagers validateDisplayList() loop, so invalidating a child object from within the show handler results in its updateDisplayList() getting called immediately.
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I am extending VBox to make a Calendar component. What method should I override to add the code to draw itself? What is the difference between all these methods? Is there something I should be putting in each one, or is there a specific method I can just override, add my drawing code, and have it work?
View 5 RepliesI have a .fla which loads 2 swfs. Each swf plays an animation. I only have the .swfs and not the .flas so I cannot add code to the animations themselves. I want the 2nd swf to play when the first is finished. Is it possible for my .fla to monitor the first loaded clip for when it ends and then play the second one.
View 2 RepliesI am currently developing a dynamic LineChart in FLEX 4.I am implementing a Tree control next to my LineChart, which will filter the LineChart dataprovider and lineseries. The tree control has several branches and ultimately 5 children (leaf nodes) at the bottom of the last branch.I need the leaf node/children to be displayed as checkboxes inside the tree control.As I understand,this will require overrides in the TreeItemRenderer class.This is where I am a little confused on how to implement that.Currently I can distinguish between leaf and branches using this code, in my main MXML component.I added this because it may be helpful to some beginning FLEXdevelopers, such as myself, who cannot easily find this functionality documented well:
private function treeClick(e:ListEvent):void {
_selectedItem = Tree(e.currentTarget).selectedItem;
if(mainTree.dataDescriptor.isBranch(_selectedItem)) {[code].....
I am looking at the TreeItemRenderer override class from the following example here: In the example, they override the "createChildden" super function to add checkboxes to the tree control.My question is, can I override the createChildren function directly in my MXML component, and not have to use an entire class file to override this functionality? Must I re-invent the wheel to do this?Also, how can I distinguish that my treeItem is a leaf node and not a parent, in the override function? I only want to add checkboxes to the leaf nodes, how can I differentiate? The following example adds checkboxes to all branches and leaf nodes, but I want to add checkboxes only to leaf node/children. How would you approach that?
override protected function createChildren( ): void
{
super.createChildren( );[code]............
Here is my tree tag:
<mx:Tree id="mainTree" dataProvider="{treeData}" itemRenderer="TreeCheckBoxItemRenderer" labelField="@label" showRoot="false" width="100%" height="100%" itemClick="treeClick(event)" />
I have a Flex 3.2 application for which I am developing a custom style. Basically the first stylesheet gets applied first, and then my custom stylesheet. I am wondering how I can completely empty a value set in the first stylesheet with a value set in the second. The value has to be blank because if the horizontal-center value is set then any other positioning values are ignored.
Example
CSS1.css
.myButton {
[code].....
I need to find a way to "upsample" text from 72dpi (screen) to 300dpi (print) for rendered client generated text. This is a true WYSIWYG application and we're expecting a ton of traffic so client side rendering is a requirement. Our application has several fonts, font sizes, colors, alignments the user can modify in a textarea. The question is how to convert 72dpi to 300dpi. We have the editior complete, we just need to make 300dpi versions of the textarea.
1) Get textarea and increase the height, width, and font size by 300/72. (if ints are needed on font size I may need to increase the font then down-sample to the height/width)
2) use BitmapUtil.getSnapshot on the textarea to get a rendered version of the text.[code]
I have two datagrids and I want to override the behavior of the tab-key event, so that it goes to the next datagrid, when the cursor reaches the end of the first datagrid columns.
View 2 RepliesI'm watching this video, which is pretty goodhows how to inherit from DownloadProgressBar to create a customer preloader for your flex app.TheDownloadProgressBar class has an overridable getter for the property 'preloader.' Isn't this poor design? What does a property called preloader have anything to do with a class for a DownloadProgressBar
View 1 RepliesIn flex charting you can customize the box which displays datatip information, but is there any easy way of changing the little circle which is displayed next to the datatip box?
http:[url].....
I've found the method positionDataTips() in ChartBase which appears to do the drawing of the circle. I was going to subclass LineChart and override the method with my modified version of it. However, this method needs access to a lot of private instance variables which are only accessible to ChartBase.
I trying here to avoid having to bind resources to all my components labels ( ie a button) and find a way to have this automated.
Problem: It corrupts the layout in design mode to bind directly in the mxml label="{resourceManager.getString('myResources', 'submit')}" and makes the design view useless. but when declaring bindings elsewhere, in actionScript or via a bind tag, it is counter productive and prone to many errors and miss.
Proposition: I would like to create my own button that automatically invoke resources to localize a button label. So the author puts "Submit" in the mxml description of my button, and when running it would take the value of the label ie "submit" and use resourceManager.getString('myResources', 'submit').
but I can't find the way to override the set label function, Is it possible if yes how? else how can I go about it?
Maybe I am missing an essential process here that would make the use of resources more elegant, as well as how to override such thing as a button's label.
I have an HTTPRequest in mxml that has an mx:request defined inside it. I use the info in the mxml request 99% of the time (I thought it was 100% until I found this bug). So I need to send the HTTPRequest with one of the items in the request different. I tried using the send() method and sending my own object, much like you would if no request was defined in the mxml, but it doesn't seem to override it.
Any ideas how I can accomplish this without re-writing every call to send this httpRequest?
I'm using a flex component that use a to load a .swf file.
The loaded .swf
- is passed to me as is and I can't edit
- it has some as3 functions in it
Is it possible in the "parent" application (the one with ) to override functions included in the "child" swf (the imported one)?
I am trying to override the default panel style on Flex 3.And the following doesn't work.
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" minWidth="955" minHeight="600"
creationComplete="init();">
[code]...
I have a global settings class, and i want to switch a var (to 1) in this class, when i call the send function and switch this var (to 0), when the result event dispatched.
I created a class, extends HTTPService..i can override the send function (override public function send(parameters:Object=null):AsyncToken), but how can i override the function, which call when the result arrived?
I want to create a custom button in ActionScript. [code]...
View 2 RepliesI got two classes.
class A{
protected var _value:A;
public function get value():A{
[Code]....
I got error in my overriding and I don't know how to work around. I want to override a method and change it's return value.
I have a datagrid with itemRenderer in datagridcolumn as my custom component(c1). I am getting the dataprovider data in custom component by overriding the set data function, it is fine. But now my custom component(c1) is also having another custom component(c2).
Now the doubt is - how to get the dataprovider data in c2 component?
I am trying to figure out how to override the default paste logic in a Flex 4 DataGrid ItemRenderer. Does anyone know how to do this?I am trying to capture the event when a user hits Ctrl-V while a cell in the DataGrid has focus and override the logic there.
View 1 Repliesi want to know what i should put befor .mx_internal
override public function initialize() : void
{
var target:DialogButtons;
var watcherSetupUtilClass:Object;
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I'm trying to override the default handling of the 'up' and 'down' keys for an editable list, such that when they are pressed a list entry that is being edited behaves as if the escape key has been pressed, but the 'selected item bar' moves up or down.
Here is my (simplified) component:
<?xml version="1.0" encoding="utf-8"?>
<mx:List xmlns:mx="[URL]"
enabled="true" width="100%" height="100%"
creationComplete="initialise()"
editable="true"
[Code] .....
For some reason this doesn't work: if a row is being edited, the first 'up' (or down) keypress ends the edit and moves the bar. Further up or down keypresses have no effect, but if you click somewhere near the list it does start working. This makes me think it is a focus issue. Weirdly, if you hit escape the edit finishes and you can move up and down correctly. If the 'callLater' line is uncommented to try and make the list retain focus, the bar initially moves in the direction of the keypress but then moves back again and re-edits the original line!
I've a custom itemRenderer for my datagrid. To set the actual data I use the following method:
override public function set data(side:Object):void{
...
}
As soon as I use this function the cell doesn't show up any item Editor anymore. Why is that? When I remove this function the itemEditor is working but with the wrong initialization data.
I have got an open source "Organisation Chart" component in Flex from the below link [URL]..But the component is in Flex 3, and I want the same in Flex 4.When I am trying to run the same in Flex 4, I am getting some weird errors :
1024: Overriding a function that is not marked for override. OrgChart.as
Any one has any idea, Please help me with this.Also If any one knows any other "Org chart" component for Flex4, Please let me know.
When using as3 and embed my swf via swf object JS, one of the parameters that being transferred to the embed JS function is "base=http://www.mydomain.com" which needed in order to load external widget into application.
Now, am also loading external assets like Styles.swf that placed locally on client side, and when I'm trying to load these assets I get error that they don't found in [URL]
For example: StyleManager.loadStyleDeclarations("Styles.swf");
Error: can't load [URL]
Is it possible somehow to load Styles.swf as local assets??? I've tried use
StyleManager.loadStyleDeclarations("../Styles.swf");
StyleManager.loadStyleDeclarations("./Styles.swf");
StyleManager.loadStyleDeclarations("/Styles.swf");
I need to override the call method from NetConnection class, the signature of the method is:
[Code]...