A "Remove" context menu item is to be shown when the user right-clicks on a button. If the user clicks on the "Remove" option, that button should be removed from its Tile parent container. How would I implement this using Flex 3 and ActionScript 3?
You need to create a custom flash.ui.ContextMenu, to which is added a ContextMenuItem corresponding to the Remove text that you want the user to select.
Add an event listener to this ContextMenuItem, which will handle removing the item clicked. Here's one way to implement the removal:
private function removeItemHandler(event:ContextMenuEvent):void
{
((event.mouseTarget as DisplayObject).parent as DisplayObjectContainer).removeChild((event.mouseTarget as DisplayObject));
Alert.show((event.mouseTarget.toString() + " has been removed."),"Display Object Removed");
}
Finally, make sure to set the contextMenu property of all the components (InteractiveObject's) you want to be removable to the custom ContextMenu you created.
Note
The code of above corresponds to Flex 3, since the question specified that. For Flex 4, one would use IVisualElement, IVisualElementContainer, and the removeElement method, in place of DisplayObject, DisplayObjectContainer, and the removeChild method, respectively.
Related
I have a spark List control that shows a side-list on ListEvent.ITEM_ROLL_OVER event. Basicaly it shows the contents of the item you are hovering. I would be also using ListEvent.ITEM_ROLL_OUT to hide it again but I want the user to be able to click on it (the sidelist) too.
So, i use MouseEvent.ROLL_OUT and check the event.relatedObject's id to see where the cursor went. I added an invisible Rectangle overlaying the sidelist that's a bit larger so it gains focus 1st. But it doesn't.
Googling around, I think that the Spark Rectangle cant gain focus as it doesn't implement InteractiveObject. What should I use?
My logic:
protected function listOUT(event:MouseEvent):void
{
var obj:Object = event.relatedObject;
if (obj.id != "focusRect")
{
sidelist.visible = false;
}
}
My struggle is to keep the side-list visible if the user moves the cursor from the main list to the sidelist.
Any other suggestions outside my approach are also welcome.
Update
(image link)
Red are the invisible Buttons
On roll_over select the item in the mainlist, display the sidelist
based on the selecteditem in the mainlist.
Hide the sidelist when there is no item selected in the main list.
Deselect items inthe mainlist if the sidelist loses focus.
Furthermore mx.core.UIComponent is the lightest component that dispatches focus events.
I have a stackpanel a TextBlock. When i tap on it,I want to display a couple of text boxes right below TextBlock and within the stack panel. And when I tap on TextBlock again the textboxes should not be visible. How can I accompalish this by just using XAML?
By just using XAML and nothing else, you can't. You have to have either a code behind or a view model bound to the page.
Add all textboxes to the StackPanel and set their Visibility to Collapsed. Also give each one a name using the x:Name property. As for your TextBlock, set IsHitTestVisible to true and add Tap handler. In the tap handler change the visibility of the previously added and named TextBoxes.
In case you want to use MVVM, bind visibility to some bool value and add converter from bool to visibility. Also add an event to command trigger to the text block element and handle it in your view model - there you will toggle the same bool property that all those text boxes are bound to.
So I have a button called manpb. When I click manpb, I want a menu to appear. The menu is a picture, but I can convert it into an object if this helps.
The best I can do is: Make a second frame with the menu, and insert the code inside the man_pb function:
gotoAndStop(2);
My problem is that I want the menu to appear on the same frame; then the menu will have buttons of his own. Any idea what to type inside the function below?
manpb.addEventListener(MouseEvent.CLICK, man_pb);
function man_pb(event:MouseEvent):void{
}
A big thank you!
The most intuitive solution might be to have your menu inside a MovieClip on the same frame. The menu buttons can also be placed within that menu MovieClip.
Simply convert your menu picture to a MovieClip (right-click, convert to MovieClip). Make sure that you select the MovieClip, and in the Properties panel give it an Instance Name, like menuMC or anything you want.
There are then a couple ways that you could handle making the menu appear only when you click the button.
1- Set the MovieClip's opacity to 0 by default, and then include this in your button function:
menuMC.alpha = 1;
thereby changing the MovieClip to fully opaque.
2- Make the MovieClip comprised of two frames, one empty frame that has a stop(); action, and one frame that contains your menu image and buttons. Then the button code would be:
menuMC.gotoAndStop(2);
3- Load the MovieClip dynamically from your library. See this for more information. edit: This is the approach that #DodgerThud is referring too, and is the more advanced but more comprehensive approach.
Use your Menu as an Object and add it to the MovieClip you want.
var menu:Menu = new Menu();//This is your Menu Symbol in your Library, you need to create one before you can use it
var manpb;//you could do the same thing for button, so you only need one symbol that has uses different labels
manpb.addEventListener(MouseEvent.CLICK, man_pb);
function man_pb(event:MouseEvent):void{
if(contains(menu)){//checking if "menu" already exists
removeChild(menu);//remove it from the displaylist
}else{
addChild(menu);//add it to the displaylist
}
}
In the Listener function you check if your current MovieClip (this should NOT be Button) already has a child that is menu. If it does, it removes the menu, otherwise, it will add the menu.
Don't forget to export your Menu for ActionScript.
Hopefully a quick question here. I have setup a "LayoutPage" custom class (based on MovieClip) and I am attemptimg to create a "selected" behaviour.
When I assign my "addEventListener(MouseEvent.CLICK,toggleSelection)" from within my custom class, everything works as expected, clicking any object of that class does display the correct behaviour.
Now, I would like to extend the functionality by adding keyboard modifyer to either extend the selection or replace it.
For this, I thought of moving the "addEventListener" out of the class and put it inside the parent instead (my "PageLayout" class where all the "LayoutPage" live). But by doing so, the click event no longer register on the "LayoutPage" class but rather on its individual children (Page icon, Page number text field, Page Highlight shape, etc.)
Can anybody explain why this is happening and how I can circumvent it?
TIA
This should be happening no matter where you put your addEventListener. It is because mouseChildren is switched on by default. It is probably best to turn it off inside your LayoutPage class like so:
myLayoutPage.mouseChildren = false;
The actual issue is that use are probably using currentTarget to reference the item that was clicked on in your event handler method. Take a look at the descriptions for currentTarget and target to get a good idea of how they differ.
A good option would be to add your listener at the PageLayout level, but add it specifically to each LayoutPage child like so:
myLayoutPage.addEventListener(MouseEvent.CLICK, toggleSelection);
This way you can just use target in your handlers. But it would probably be best to still switch mouseChildren to false on each of your LayoutPage instances.
I'd like to conditionally hide a tab in a TabNavigator. It seems that setting visible doesn't work properly (presumably because this is how the TabNavigator hides the tabs that aren't currently selected).
What's the right way to do this?
You can do this by making use of TabNavigator's getTabAt() method which returns the Button that makes up the visual tab. You can then set that Button's visible property. It's a little tricky to get this setup with a bindings, but it's doable.
You could also consider just disabling the tab instead, which you can do by setting enabled on the corresponding TabNavigator child (for which visible didn't work).
What do you mean by hide? If you actually mean remove, then just take your array that's bound to the data in the TabNavigator, and remove the applicable element from it.
If you want to just have them removed temporarily, create a component of your own that encapsulates the TabNavigator and has an array of removed tabs and an array of actual tabs. Then handle this as you see fit.
You might want to check out the flexlib project. They have a component called SuperTabNavigator that adds a lot of functionality to the base Flex TabNavigator, including hiding tabs (I think).
If you do have to create your own component, though, it's a bit more tricky. The thing to know is that "tabs" are actually specially styled buttons, contained within a TabBar component (the TabBar is then contained within the TabNavigator). What you'll have to do then, is subclass TabNavigator and have some property on your views (i.e. the canvases, etc. that are added to the TabNavigator) that is bound to the visible and includeInLayout properties of the TabBar buttons.
In essence, what you'll have is something like:
BindingUtils.bindProperty( tabButton, "visible", view, "someProperty" );
BindingUtils.bindProperty( tabButton, "includeInLayout", view, "someProperty" );
I don't know about TabNavigator, but in other containers, you can set the includeInLayout property to false and it will be ignored. You probably still need to combine it with visible.
var secondTab = tabNavigator.removeChildAt(0);