applyMainWindowSettings bug?

Vladimir Prus vladimir at
Fri May 2 19:39:00 BST 2008

Lubos Lunak wrote:

> On Thursday 01 of May 2008, Vladimir Prus wrote:
>> 6. Run application again. Expected result is the the window be maximized.
>> Actual result is that the window is 200x200.
> . Qt bug.
>> I think what happens is.
>> 1. KMainWindow::restoreWindowSize, when handling the maximized window,
>> does not call resize(). Instead, it asks the window manager to resize
>> the window.
>> 2. QWidget::setMinimumSize does:
>>      resize(qMax(minw,width()), qMax(minh,height()));
>> since the size is not yet changed at this point, we explicitly set the
>> size to whatever the size the widget already has.
>> It seems that the only right solution would be to wait for the window
>> manager to actually resize the window to whatever size corresponds to
>> "maximized".
>  No. If  memory serves me well, that's actually what happens and what is
> causing the problem. The resizing in your step 2. actually happens _after_
> the window is shown and maximized by the window manager, because of Qt's
> delayed layout activation (or whatever it is exactly that triggers it so
> late). 

In the real KDevelop case, it's indeed QLayout::activate that calls setMinimumSize.

> So the window is first maximized by the window manager and then the 
> application immediatelly asks to be resized again (and width()/height() still
> return old size because of X being asynchronous).

Is there no way to sync with X? Any possible workarounds?

Anyway, I've hacked this around by saving/restoring geometry(), and now I have
two further questions about applyMainWindowSetting.

1. Can I make it not restore size? Regardless of the bug, in KDevelop we sometimes
use it to restore just toolbar position/settings. Currently, the function
always restores window size -- can another version be introduced that does not
do this?

2. I've noticed that if I try to switch toolbars into icon only mode, then
with each save/restore cycles one toolbar moves to the left some amount. The problem
seems that we first restore toolbar geometry, and then apply icon settings, that
change toolbar size. The attached patch seems to fix that for me -- does it look
OK to commit?

- Volodya

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