Hello Peter.
Let me see if I undestand you right.
You are worried about low memory situation, when
'Save Behind' doesn't work. In this case each form will
get a single frmUpdate event. You don't want to keep
window stacking order (Z-order in MS Windows terminology),
in expectation that no stacking order is needed,
if as a response to frmUpdate event only a single
rectangle has to be redrawn - right ?
If I am wrong, please disregard all the rest of the message.
Here is my concern.
Look at the information passed by frmUpdateEvent:
struct frmUpdate {
UInt16 formID;
UInt16 updateCode;
} frmUpdate;
As you can see, there is no rectangle at all.
A normal human reaction would be redrawing the
whole form! Is there any difference when the overlap
is more complex ? Not as I can think of.
Consider an example:
Form A: (left, top, right, bottom) : 0, 80, 160, 160
calles
Form B: 0, 100, 160, 160
which in turn calls
Form C: 0, 120, 160, 160
which in turn calls
Form D: 0, 60, 160, 160
All Palm requirements are met.
Form D is currently active, and no other forms are seen.
I press "Done" which makes form D disappear. Form C becomes
an active form, but A and B also need to be redrawn.
Is the order of calling frmUpdate is insignificant ?
Can we get away without a stacking order ?
Will the situation be worse if widht+alignment requirements are not
fulfilled ?
My answer is "No" to each of those questions.
Do you really think differently ?
Regards,
Michael.
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