[lazarus] CVS Changes

Marc Weustink Marc.Weustink at cuperus.nl
Fri Oct 13 07:06:13 EDT 2000

+ From: Shane Miller [mailto:SMiller1 at stvgb.org]
+ This CONTROL.LEFT error has existed for quite some time.  I
+ had mentioned it quite some time ago but haven't been able to
+ look at it to determine where it gets messed up.
+ This causes quite a few problems.  One of them is the problem
+ when grabbing and moving controls.  This needs to be looked
+ into and I would love it if someone would volunteer to get to
+ the bottom of this error...

You can see this behaviour in the Selection example I submitted. In that
example there is also a button for drag testing.

It is BTW not only the CONTROL.LEFT property CONTROL.TOP has it as well (a
bit less but it has it)

As far as I can see, this problem is only visible during dragging. I think
that is has something to do with moving a control whith the mouse over it.
In this case it is probably not defind which event ocours first, the control
moved event or the mouse moved event (if you move a control while the mouse
is at the same screen location, it is in fact a mouse move for the control)

Dragging the selection shows some funny results. The grabbers are moved with
the same delta as the button, but on screen this doesn't look so (sometimes)

A solution might be to forget the mouse pos you get from a GTK event (it is
relative to a control) but calculate it ourselfes from the screen position
(this wayt we also solved drag mouse movement outside out control)


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