Hi,
I am not sure, but I think my previous post was not published.. so I am sending it again.
I have a simple program that opens up an alert dialog whenever a user
presses a button (yes, tis a VERY simple program...).
I can see that whenever the dialog appears a new canvas is created (I
made a few changes to the platform code that notify me whenever this
happens).
So far, whenever a drawing (any drawing) was performed on the canvas,
it was using absolute coordinates , HOWEVER, when the dialog appears,
all canvas operations are performed on relative coordinates (relative
to the dialog box).
I am not sure why this happens. .
- Why is the drawing of a dialog using a different coordinate system
(while buttons, lists etc. don't)?
- How can the canvas instance know that it is now drawing to some
position not relative to the normal screen coordinates?
- I've also noticed that gravity affects the position of the dialog
box. Who is in charge of these gravity calculations (not the canvas
anyway)?
- To what surface does this canvas belong? I could not find any
indication of new surface creation when the dialog was created.
I think that understanding this would finally unveil this major
building brick I am missing in the Android views architecture.
Thanks a lot
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