I have a TabNavigator component which is not showing its children when adding them at runtime.
Is there a way around this please?
I'm doing the following at the moment:
var tabNavigator:TabNavigator = new TabNavigator();
// etc.
parentHBoxContainer.addChild(tabNavigator);
// etc.
// Custom component with nothing special in it
// Trigger on a button click (Add)
var myComponent:MyComponent = new MyComponent();
var nextTabIndex:int = tabNavigator.getChildren().length;
tabNavigator.addChild(myComponent);
// I see some text flashing but the current tab stays the same
// No text is added
tabNavigator.validateNow();
tabNavigator.selectedIndex = nextTabIndex;
Sorry guys for not giving enough details. The tabNavigator is inside an HBox container, I didn't add the code because I thought it would be irrelevant.
I replaced SimpleComponent by MyComponent in the code above. MyComponent is just another HBox with a textfield and a label.
Thanks.
Try to put this:
tabNavigator.addChild(myComponent);
tabNavigator.selectedChild = myComponent;
instead of this:
var nextTabIndex:int = tabNavigator.getChildren().length;
tabNavigator.addChild(myComponent);
// I see some text flashing but the current tab stays the same
// No text is added
tabNavigator.validateNow();
tabNavigator.selectedIndex = nextTabIndex;
Related
I have an empty layout in xaml.
I add a view to it:
layout_secondLayout.Children.Clear();
layout_secondLayout.InputTransparent = false;
layout_secondLayout.Children.Add(new Page_SubCategories(Helpers.CategoriesEnum.food, AppResources.FoodAndDrink));
layout_secondLayout.IsVisible = true;
When the user clicks back, i disable the layouts children:
layout_secondLayout.Children.Clear();
layout_secondLayout.IsVisible = false;
layout_secondLayout.InputTransparent = true;
When I now however call the upper method again to add another layout to the now again empty layout, it just doesnt react upon first click. If I click another time, the layout is shown, but twice ( as it now has 2 children.)
Why is that?
I have made a hierarchy in which there is a main page, using add element i have attached a component mxml of type group. There is a single button on main page when clicked it should add children of type group in that group type mxml component along with two buttons. Now using one of buttons i am attaching another component mxml type group. the problem is even they overlap i can still excess the children groups of first group component mxml. how can i stop this mouse events to happen.
I think those kind of events usually bubble up to parent components.
You can try using the following code in your mouse click event listener to stop further propagation:
private function onMouseClicked(event: MouseEvent): void {
event.stopPropagation();
... do whatever you wanted when smth was clicked ...
}
By setting enabled, mouseChildren, mouseEnabled to false, you will disable the entire component and it's children. example below
private var myPreviousGroupComponent:Group = null;
function addNewGroup():void
{
if(myPreviousGroupComponent != null)
{
myPreviousGroupComponent.enabled = false;
myPreviousGroupComponent.mouseChildren = false;
myPreviousGroupComponent.mouseEnabled = false;
}
var newGroup:Group = new Group();
addElement(newGroup);
myPreviousGroupComponent = newGroup;
}
I'm having a problem similar to FLEX: dialog not display immediately . Code follows:
private function saveBitmap(event:ContextMenuEvent):void
{
loadingScreen.visible = true;
loadingScreen.appLoadingText.text = "Preparing bitmap...";
addChild(loadingScreen);
validateNow();
var bmpd:BitmapData = new BitmapData(canv.width, canv.height);
bmpd.draw(canv);
var fr:FileReference = new FileReference();
fr.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA, removeLoadingScreen);
fr.addEventListener(Event.CANCEL, removeLoadingScreen);
var png:PNGEncoder = new PNGEncoder();
var iba:ByteArray = png.encode(bmpd);
fr.save(iba, "export.png");
}
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().
Any ideas?
Cheers!
You're adding the child in this function. Are you doing any other work to the loadingScreen, such as sizing it? Or positioning it? Most commonly this is done in updateDisplayList(). What container are you using?
Are you sure the Z-order of your two children is correct? You can swap children with the swapChildren method
for (iss = 0; iss < listOfProductIds2.length; iss++)
{
// Alert.show(listOfProductIds2[iss]);
var productMain:VBox=new VBox();
var p1:HBox=new HBox();
var l1:Label=new Label();
var b1:Button=new Button();
var spacer:Spacer=new Spacer();
spacer.width=300;
b1.label="Remove";
b1.setConstraintValue("id","");
b1.addEventListener(MouseEvent.CLICK,removeProduct);
l1.text="Product "+iss;
p1.setActualSize(500,500);
p1.addChild(l1);
p1.addChild(spacer);
p1.addChild(b1);
productMain.addChild(p1);
}
function removeProduct(event:MouseEvent):void
{
// How do i know which button is clicked
}
Use event.currentTarget (instead of event.target) because event.target might be the Label component or some styling component within the button, but currentTarget is assured to be the object with which the listener was registered.
To get a handle to the button that was clicked you can just cast the currentTarget to a button.
function removeProduct(event:MouseEvent):void
{
var b1:Button = Button(event.currentTarget);
}
The method setConstraintValue is for setting layout constraints, not setting id. The id property is used by mxml for creating variable names for objects. You can get/set id as you would get/set any other property (say width) - but neither have I seen anyone doing that nor do I see any need to do that in the first place.
event.target should point to the Button you clicked on, shouldn't it ? However you should probably give ids to the buttons to be able to differenciate them (since you create them dynamically.)
Look at event.target.
If ids are assigned dynamically as in the example given b1.id = "button_" + listOfProductIds2[iss]
Then the function that processes the click event would look at the currenttarget, and what I usually do is do a string replace on the part of the id that you know is not dynamic like "button_" with "", which leaves you with the name of the product.
Flex has built in drag-n-drop for list controls, and allows you to override this. But they don't cover this in examples. The built-in functionality automatically drags the list-item, if you want to override this you find the handlers are being set up on the list itself.
What I specifically want to do, is my TileList shows small thumbnails of items I can drag onto a large Canvas. As I drag an item from the list, the drag proxy should be a different image.
So, I followed the technique suggested and it only works if I explicitly set the width/height on the proxy Image. Why?
It's not obvious until you've tried it =) I struggled with the same thing just a few weeks ago. This was my solution:
The list:
<List>
<mouseDown>onListMouseDown(event)</mouseDown>
</Tree>
The mouse down handler:
private function onMouseDown( event : MouseEvent ) : void {
var list : List = List(event.currentTarget);
// the data of the clicked row, change the name of the class to your own
var item : MyDataType = MyDataType(list.selectedItem);
var source : DragSource = new DragSource();
// MyAwsomeDragFormat is the key that you will retrieve the data by in the
// component that handles the drop
source.addData(item, "MyAwsomeDragFormat");
// this is the component that will be shown as the drag proxy image
var dragView : UIComponent = new Image();
// set the source of the image to a bigger version here
dragView.source = getABiggerImage(item);
// get hold of the renderer of the clicked row, to use as the drag initiator
var rowRenderer : UIComponent = UIComponent(list.indexToItemRenderer(list.selectedIndex));
DragManager.doDrag(
rowRenderer,
source,
event,
dragView
);
}
That will start the drag when the user clicks an item in the list. Notice that I don't set dragEnabled and the other drag-related properties on the list since I handle all that myself.
It can be useful to add this to the beginning of the event handler:
if ( event.target is ScrollThumb || event.target is Button ) {
return;
}
Just to short circuit if the user clicks somewhere in the scrollbar. It's not very elegant but it does the job.
I found a simpler answer here. That example extends a DataGrid control, but you can do the same with a List control. In my case, I use an image source instead of Class:
public class CustomDragList extends List {
[Bindable]
public var dragProxyImageSource:Object;
override protected function get dragImage():IUIComponent {
var image:Image = new Image();
image.width = 50;
image.height = 50;
image.source = dragProxyImageSource;
image.owner = this;
return image;
}
}
Then use that custom list like this:
<control:CustomDragList
allowMultipleSelection="true"
dragEnabled="true"
dragProxyImageSource="{someImageSource}"
dragStart="onDragStart(event)"/>
Where 'someImageSource' can be anything you'd normally use for an image source (embedded, linked, etc.)