Is there any shortcut way to add an eventListener to something like a select event for NavigatorContent.
I am aware I can add a listener for a change event on the ViewStack and identify the selected NavigatorContent through that handler.
The ViewStack component dispatch a CREATION_COMPLETE event on the new selectedChild
As2 has shortcuts for what you want, im afraid as3 doesnt as AS3 wants to know exactly whats needed to care for at what time.
an update /enterframe function can reduce some code but apply more load on the swf over all as its waitng for a call.
throw some code up in your question so we all know exactly what your talking about.
Related
I need to be able to trigger an event on change, but only when user focus out of the input text.
Is there any one event I can use?
I guess I can use a combination of both, by finding out which of them triggers last, and only use that, if the other has been called, but that introduces some complexity and clutters the code.
There's no single event that combines both of these concepts. You'll need to write some custom logic to do what you're describing.
Using the mx.managers.FocusManager getFocus() method you can find the component that currently has focus. In the change handler on the TextInput you can check if this TextInput currently is the component with focus. If not, you can go about your business.
I am looking for an event which is fired (if any) after a chart is rendered (visible in UI) in Flash, we are using Flex SDK 3.0. We have to capture the screenshot after the chart is rendered, current implementation adds a huge delay in update_complete event callback, this is slowing down the whole job of generating images.
I tried to use EXIT_FRAME event, but this doesn't seem to serve the purpose. Any help to resolve this issue is highly appreciated.
Regards,
Dan
Adobe use this event : mx.events.FlexEvent.TRANSFORM_CHANGE
But if you want to use it, you are obligate to inherit from Chart Component classes. Take a look at DataTransform Class.
http://help.adobe.com/es_ES/FlashPlatform/reference/actionscript/3/mx/charts/chartClasses/DataTransform.html
I suggest you to look at the DisplayObject liveDoc, where there are several types of events. Some are fired before the rendering (Event.RENDER), some are fired after specific operation (ResizeEvent, for instance). But if you really want to know when you chart has been rendered, why don't you watch for the validation methods (updateDisplayList(), commitProperties()) by overriding them in a child class and fire a custom event in there ?
I have a flex 3 datagrid that is in a completely separate container from the object that I am trying to reference it from - i.e. the datagrid is in a vbox, and I am trying to set a property in the datagrid from a popup.
How do I access the datagrid from the popup?
I'd like to do something like:
myView.myDatagrid.resizableColumns = false;
Using cairngorm as a framework if that is of any help.
You'll have to explain your architecture better to get a specific answer. This answer may help as everything I said about running methods on another component, also applies to accessing properties.
One solution for you is to pass the DataGrid instance into the popup as an instance variable; then the PopUp will be able to change the DataGrid's properties easy.
When you add your popup, you need to listen for an event. Then your PopUp needs to dispatch an event that the parent can handle.
myPopup.addEventListener(SomeEvent.DISABLE_COLUMNS,disableResize);
and then in the parent component
public function disableResize(event:SomeEvent):void{
myDatagrid.resizableColumns = false;
}
This assumes a custom event called SomeEvent... you can actually just create a default Flash event and give it a name like
dispatchEvent(new Event("MyDisableResizeEvent"));
Assuming you've got a button in your popup:
<mx:Button click="{dispatchEvent(new Event('MyDisableResizeEvent'));}" label="Disable Resizing"/>
I've a little problem, I don't really understand if I can use addEventListener more than one time on the same object (and same callback function) if this case can I have a problem of overflow, or simple flex is so smart to not add again in the same stack same function
for examples:
var t:CServiceObj = _rModel.userGetBoardJoined();
t.addEventListener(EDataService.DATA_AVAILABLE,onDataOk);
t.addEventListener(EDataService.DATA_AVAILABLE,onDataOk);
t.addEventListener(EDataService.DATA_AVAILABLE,onDataOk);
As you say, Flex is "smart" and even if you subscribe to an event more than once on the same instance, then the handler will be called Just once (no matter how many addEventListener you pass).
I tried a quick test on Button and it doesn't matter if the addEventListener is added multiple times to the same function -- it gets dispatched once.
However, you could set up something like this
t.addEventListener(EDataService.DATA_AVAILABLE,onDataOk);
t.addEventListener(EDataService.DATA_AVAILABLE,onDataOk2);
where onDataOk2 calls onDataOk with the event parameter.
Interesting Note
A different test, I added a click handler in the mxml tag, and a click handler in the AS, both pointed to the same function. When the button was clicked, both handlers dispatched, so Flex did something behind the scenes to accomodate this functionality.
I'm new to Flex, although not new to programming. I want to write a generic event handler that will be called by all my textinput boxes when they receive focus. When they have focus, I want to change the colour of the textinput box. When they lose focus, I want to restore the "inactive" color profile. I could write an ActionScript event handler for each textinput box, but we all know that's lame. :o) What I need, then, is a way to access the object which is calling the event handler.
In Delphi, I'd have written a function which passes in the Sender object, allowing me to access the calling object's properties. I'm guessing ActionScript/Flex has a completely different architecture, which is why I'm having difficulty doing this.
Thanks in anticipation!
You should subclass TextInput and handle the focus events in there. I think this would be the simplest way to achieve what you are looking for without having any complex code.
I hope I'm understanding what you're asking for... are you talking about event delegation?
This worked for me:
// 'focusOut' for blur
stage.addEventListener('focusIn', function(e:Event):void {
// The focused control is e.target
});
If you want to change the look of the focused input box, you can do this by setting the focusSkin property. If you want this to happen globally, you can put a style declaration in your CSS file.
In this CSS example I'm replacing the default focusSkin (mx.skins.halo.HaloFocusRect) with an embedded PNG file.
TextInput {
focusSkin: Embed(source="focus.png");
}
TextInput has a few properties for altering the look of the focus, like changing the opacity of the focus skin (focusAlpha property). Check the TextInput documentation for more info.