Comments on: AS3 scrollRect vs height & getBounds()

By: almo

almo — Fri, 25 Nov 2011 01:37:21 +0000

One way to fix the problem with the “scrollRect one-frame delay before you can read width/height” is to use scrollRect.width or scrollRect.height instead of width/height. Those values are available right away.

By: How to retrieve original movieclip height after applying scrollrect in AS3 « encryptedpixel

Fri, 19 Aug 2011 07:11:05 +0000

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By: Aaron Beall

Aaron Beall — Thu, 24 Mar 2011 08:43:46 +0000

Moock’s example is to draw to an arbitrarily large bitmapdata and use getColorBoundsRect. There are a number of problems with that approach (as well as all other examples I could find), but it led me to discover the one workaround that seems to account for everything:
BitmapData.draw() forces an object to be redrawn immediately. It works around all the wonky deferring of changing scrollRect, and it works with parent trees, getBounds, and all other scenarios I could find.
It’s kind of frustrating there isn’t a built in solution, if BitmapData.draw can tell what needs to be redrawn and redraw it immediately, why isn’t there a way for us? Anyway, in the end my redraw method is simply:
package {
import flash.display.DisplayObject;
import flash.display.BitmapData;

public function redrawNow(displayObject:DisplayObject):void {
var bitmapData:BitmapData = new BitmapData(1, 1);
bitmapData.draw(displayObject);
bitmapData.dispose();
}
}
So now for instance I can:
var oldRect:Rectangle = obj.scrollRect;
obj.scrollRect = null;
redrawNow(obj);
var bounds:Rectangle = obj.getBounds(this);
obj.scrollRect = oldRect;
redrawNow(obj);

By: azurDePuch

azurDePuch — Thu, 09 Jul 2009 18:35:51 +0000

nice try, but it didn’t work for me

take a look at this

http://www.moock.org/blog/archives/000292.html

By: Karoshi Ethos » Get Visible Width & Height of DisplayObject (redux)

Karoshi Ethos » Get Visible Width & Height of DisplayObject (redux) — Tue, 26 May 2009 18:22:41 +0000

[...] You may remember my article on scrollRect and getBounds(). [...]

By: Joe Wheeler

Joe Wheeler — Tue, 24 Feb 2009 11:35:36 +0000

Here's a fix: accurately get the width and height of scrollRect content. It takes a bit of mucking about with matrixes, but I works consistently, whether or not the DisplayObject is on the display list; doesn't require adding/removing from the display list and is unaffected by parent transforms. Hope this helps someone. J

By: Hardik Dubal

Hardik Dubal — Tue, 24 Feb 2009 05:04:04 +0000

Thank you… content.transform.pixelBounds.height worked for me while trying to make a scroll bar.

By: Find the height and width of a Sprite with a scrollRect » Joe Wheeler » Use Cake

Tue, 24 Feb 2009 01:19:43 +0000

[...] Jon Williams posted an interesting idea, using transform.pixelBounds. Which actually gets most of the way to a solution, but it all goes horribly wrong when the any of the parent objects are scaled and/or rotated. It also finds weird values when the object is off the display list (always x5 the actual value). [...]

By: Joe Wheeler

Joe Wheeler — Mon, 23 Feb 2009 22:48:08 +0000

Sorry, I’ve found a bug. The pixelBounds value changes if the parent, or any of the display containers surrounding the clipped DisplayObject are transformed in any way what so ever. So, if you scale the parent clip to 10% your pixelBounds will be 10% of the correct value. Probably the easiest work-around is to temporarily remove the DisplayObject from the display list and divide the pixelBounds values by five. What a palava.

By: paulo barcelos

paulo barcelos — Fri, 13 Feb 2009 20:38:52 +0000

Thanks!
I spent 3 months trying to figure out why content.height would output the correct values… content.transform.pixelBounds.height is the solution!!