On Mar 1, 2006, at 12:00 PM, Thom McGrath wrote:
I'm subclassing RectControl (because of the standard mouse events &
such) and need to know when it is moved. There doesn't appear to be
any Resized or Moved events, so how do I know when it has been moved?
I have tried overriding the various positioning properties, such as
Left, with a computed property. This works great when moving
programmatically, but they don't get set while to window is
resizing with Lock* properties enabled on it. It also crashes the
app (unexpect quit) when I try to get or set super.left, which is
another major problem.
Can somebody help me find a way?
I do something similar.
All of these actions trigger the Paint() event in a Canvas, or in a
ContainerControl. With the ContainerControl you have better control
and it includes Moved(), Resizing() and Resized() events (never tried
to use Moved() but the other two I have).
But there are issues that I have run into with ContainerControls
which make it less than perfect. Such as the quirks of the
ContainerControl (it is new after all) since ContainerControl on
windows do not behave quite the same as other controls (like you
cannot create control arrays) -- but most of these can be worked
around as long as you are aware of them. The most significant
problem that I have found is that the ContainerControl cannot get
notified of a change of Enabled state except in the Paint() event...
and if you have code in the Paint() event then it can start a cascade
of Paint() events for all of the overlapping controls above and below.
In short, there is no good answer but you might get further along
using a Canvas and checking for a new position and/or size in the
Paint() event, or by using a ContainerControl.
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