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Re: accessibility and iTunes?!?
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Re: accessibility and iTunes?!?


  • Subject: Re: accessibility and iTunes?!?
  • From: Eric Schlegel <email@hidden>
  • Date: Wed, 4 Oct 2006 11:24:34 -0700


On Oct 4, 2006, at 10:19 AM, Ondra Cada wrote:

although direct sending of events would be much better for my purpose, since I got no luck with it so far, I am also testing the accessibility API. I've got a strange results though... do I overlook something, or does the thing just not the heck work?!?

Whatever did I try, AXUIElementCopyElementAtPosition at the best found a window, much more often it found application only. So, I've rigged my own simple recursive go-thru-children and-check-hits method.

This question would probably be better directed to the accessibility- dev list, since it isn't specific to Cocoa.


The core looks like this:

id kind,val;
CGPoint cgp;
CGSize cgs;
if (AXUIElementCopyAttributeValue(ui,kAXRoleAttribute, (CFTypeRef*)&kind)!=0) return NULL;
if (AXUIElementCopyAttributeValue(ui,kAXPositionAttribute, (CFTypeRef*)&val)!=0) return NULL;
if (!AXValueGetValue((AXValueRef)val,kAXValueCGPointType,&cgp)) return NULL;
if (AXUIElementCopyAttributeValue(ui,kAXSizeAttribute, (CFTypeRef*)&val)!=0) return NULL;
if (!AXValueGetValue((AXValueRef)val,kAXValueCGSizeType,&cgs)) return NULL;
NSRect rr=NSMakeRect(cgp.x,cgp.y,cgs.width,cgs.height);
NSLog(@"searching %@ in %@, %@",NSStringFromPoint(pt),kind,NSStringFromRect(rr));
if (!NSPointInRect(pt,rr)) return NULL;


Looks fair, or have I overlooked something?

Looks reasonable to me.

Does not work. With iTunes 6.0.4 (3) I keep getting horrible y- coordinates:

2006-10-04 19:04:25.895 Media Center[8694] searching {738, 773} in AXWindow, {{518, 260}, {710, 556}}
2006-10-04 19:04:25.896 Media Center[8694] found, trying 6 children...
2006-10-04 19:04:25.898 Media Center[8694] searching {738, 773} in AXScrollBar, {{892, 17317}, {15, 83}}
2006-10-04 19:04:25.903 Media Center[8694] searching {738, 773} in AXScrollBar, {{892, 17317}, {15, 83}}
...

It wouldn't surprise me if iTunes 6 kept its scrollbars positioned far offscreen normally and only moved them onscreen right before drawing.


With iTunes 7.0 (70) the coordinates seem right, but instead of scrollbars and similar I keep getting some unknown elements (whose lists of actions are empty)...

2006-10-04 19:11:18.021 Media Center[275] searching {403, 638} in AXWindow, {{190, 119}, {710, 556}}
2006-10-04 19:11:18.021 Media Center[275] found, trying 1 children...
...


Dammit. How the heck does one control another application?!?

For iTunes, I'd recommend AppleScript. I believe that's what FrontRow uses, for example. The problem with using Accessibility to control iTunes is that due to iTunes's requirements to run on both Mac and Windows, and have a variety of specialized and rapidly-changing UI features, it uses few of the standard system views, and implements many of its own views - and it does not implement accessibility support for most of its own views yet.


-eric

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References: 
 >accessibility and iTunes?!? (From: Ondra Cada <email@hidden>)

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