On Sun, 4 Apr 2010, Mattias Gaertner wrote:
On Sun, 4 Apr 2010 13:31:10 +0200 (CEST)
Michael Van Canneyt <[email protected]> wrote:
Hello,
I'm writing an article about docking in Lazarus.
The first - and most simple - example I tried, failed:
- Drop a panel on a form
- Set dragkind to dkDock
- Set dragmode to dkAutomatic.
- Run application
- Drag panel outside form, and let go.
expected behaviour: a small form should appear, and the panel should be on it.
Actual behaviour: 4 Access violations (fix one to get to the next ;) ).
Attached small patch fixes the 4 access violations, after which the expected
behaviour
occurs. They are all checks to see if a object pointer is not-nil.
Thanks. Applied.
Great, thank you.
Maybe you can also have a look at the following bug:
- Create main form as above.
- Additionally Set docksite=true for the main form.
Run program.
- Drop panel outside main form. DockForm appears, panel is on it :-)
- Now drop the panel back on the main form.
-> The panel disappears.
All properties I thought of check out OK: visible, parent (it is main form),
it's size.
(size of the form).
The same problem happens when you manually dock the panel back on the main form:
I do this with the following code in a button on the main form:
Panel1.ManualDock(Self,Self,alTop,true);
I tried debugging it, but the error escapes me. All seems to be working as it
should,
except that the control is not drawn on it's new location :/
It's not a panel problem, I tried with some other controls as well.
(tested on GTK2, latest Lazarus and FPC)
Michael.
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