Re: [g-a-devel] AccessibleComponent_getAccessibleAtPoint(): doesn't work for all cases?

[Li Yuan <Li Yuan Sun COM>]

Quiring, Sam wrote:
> Greetings,
>  
> Over in the Mozilla accessibility mailing list 
> (dev-accessibility lists mozilla org 
> <mailto:dev-accessibility lists mozilla org>) I asked how to determine 
> the topmost object under the mouse, the object that would get the 
> event if the user clicked?  Aaron Leventhal answered "MSAA and AT-SPI 
> have a way to get the accessible object at a point".  With some help I 
> eventually discovered the at-spi 
> routine AccessibleComponent_getAccessibleAtPoint(), which has worked 
> great until today.
>  
> I have a GTK window on the screen and the mouse is hovering over a 
> Text box.  Below is a dump of part of the at-spi accessibility tree 
> representing that area of the window.  The mouse is at (x,y) = (1060, 
> 538).  This is inside the text object shown at the last line of the dump.
>  
> I call AccessibleComponent_getAccessibleAtPoint(...,1060, 538) on the 
> "page tab list" object and it returns NULL.  Given the data in the 
> dump, I can see how this might have happened: there are exactly 2 
> children of "page tab list" and neither contain (1060, 538):
>  
> child 2/2 (n:,d:,r:page tab list) Box[756,508,506,170] [actions: ] 
> [subs: Component Selection ] (children: 2)
>   child 1/2 (n:,d:,r:page tab) Box[-2147483648,-2147483648,0,0] 
> [actions: ] [subs: Component Text ] (children: 1)
>   child 2/2 (n:,d:,r:page tab) Box[756,508,0,0] [actions: ] [subs: 
> Component Text ] (children: 1)
Probably because these component doesn't have the right value. Are these 
text view?

Li
> but if we look further, we can see that deeper descendents do contain 
> (1060, 538), including the text box at the bottom of the dump, which 
> is what I was looking for.
>  
> Is this a bug in AccessibleComponent_getAccessibleAtPoint()?  If not, 
> is there another routine I should be calling to get the accessible 
> object at a point?
>  
> -Sam
>  
>  
> *_key: Box[x, y, width, height]_*
> child 2/2 (n:,d:,r:page tab list) Box[756,508,506,170] [actions: ] 
> [subs: Component Selection ] (children: 2)
> child 2/2   - [states: enabled, sensitive, showing, visible]
>   child 1/2 (n:,d:,r:page tab) Box[-2147483648,-2147483648,0,0] 
> [actions: ] [subs: Component Text ] (children: 1)
>   child 2/2 (n:,d:,r:page tab) Box[756,508,0,0] [actions: ] [subs: 
> Component Text ] (children: 1)
>     child 1/1 (n:,d:,r:filler) Box[756,508,506,170] [actions: ] [subs: 
> Component ] (children: 2)
>       child 1/2 (n:,d:,r:scroll pane) Box[762,514,494,122] [actions: ] 
> [subs: Component ] (children: 2)
>         child 1/2 (n:,d:,r:viewport) Box[762,514,476,122] [actions: ] 
> [subs: Component ] (children: 1)
>           child 1/1 (n:,d:,r:panel) Box[764,516,472,385] [actions: ] 
> [subs: Component ] (children: 12)
>             child 1/12 (n:,d:,r:panel) Box[1162,528,68,56] [actions: ] 
> [subs: Component ] (children: 1)
>             ...
>             child 11/12 (n:,d:,r:panel) Box[912,528,250,25] [actions: 
> ] [subs: Component ] (children: 1)
>               child 1/1 (n:,d:,r:text) Box[912,528,250,25] [actions: 
> activate] [subs: Action Component EditableText Text ] (children: 0)
> ------------------------------------------------------------------------
>
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