[lazarus] A Bug, a feature or am i just stupid (Dialogpositions)

[Mattias Gaertner]

On Sun, 28 Sep 2003 15:26:23 +0200
Tobi <lazarus at bick-online.de> wrote:

> Hi,
> 
> im using Lazarus CVS(today, about 12:00) version and FPC 1.0.10.
> 
> I have a dialog (fsnormal, podefault, wsnormal,  bsdialog)
> and i want to save the position of the window (left and top).
> Saving is no problem, i use OnHide, OnClose and OnDestroy.
> OnChangeBounds works till i hide - show the window. See below.
> 
> OnCreate:
> 	I restore Left and Top
> 	- looks like that the buttons, notebook, ... are placed somewhere
>         - the window stays in podesign
>           screenshot: http://www.bick-online.de/download/scr1.png

Can you send a small example?


> Override Create
> 	- restore old position - works fine
> 
> OnShow
> 	- restore last position
>         - nothing happens
>         - window stays on "Override create" position

Windowmanagers can only be asked to move a window, often they ignore it.
gtk2 has some improvements for this.


> OnActivate
> 	- use left:100, top:100
> 	- move to 200, 200
> 	- hide - show
> 		- you see the window comes back at 100, 100 and then moves to 200,
> 		200- again hide -  show without moving
> 		- restore at 200, 200
> 	- move to 300, 300
> 		- the same. window comes at 200, 200 and ........

The LCL asks the gtk-interface, which asks the gtk, which asks X, which asks
the windowmanager. This works asynchronous. What you see is the answer of
gtk/X/wm.

 
> OnPaint
> 	- see OnActivate
> 	- but worse when you move the window. is it called when you move?

Depends on the windowmanager. Most of the times: no.


> OnChangeBounds
> 	- i can see that left and top change
> 	- hide - show
> 		- looks like OnChangeBounds is called with
> 		  position from "Override create"
> 	- useless for me
> 
> So, what is it?
> How to save - restore a window position?

In OnCreate, or after the 'inherited' in the overriden constructor.


Mattias