Greetings,
Over in the Mozilla accessibility mailing list
([email protected]) 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)
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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