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Qt-interest Archive, August 2007
How to Center an application ?

Message 1 in thread

Hello,

How do I need to center the application when it start up ?

I am working on Suse Linux 10.2 with Qt 4.3.

Thanks,
-Joshua

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Message 2 in thread

Joshua Robinson wrote:
> How do I need to center the application when it start up ?

Look at QDesktopWidget. It'll tell you what size screen you are working 
with. From that you can center your application's main window.

--Dave

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Message 3 in thread

Its working thank you all.

Dave Smith wrote:
> Joshua Robinson wrote:
>> How do I need to center the application when it start up ?
>
> Look at QDesktopWidget. It'll tell you what size screen you are 
> working with. From that you can center your application's main window.
>
> --Dave
>
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Message 4 in thread

Joshua Robinson wrote:
> Hello,
> 
> How do I need to center the application when it start up ?

See QDesktopWidget for getting the desktop geometry then QWidget docs 
and finally Window Geometry Documentation...

- get the desktop size and your application window's size
- move the window on the X axis to (desktop.width() - window.width()) / 
2 and on the Y axis to (desktop.height() - window.height()) / 2)

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Message 5 in thread

> -----Original Message-----
> From: Joshua Robinson [mailto:shooki.robinson@xxxxxxxxx]
> Sent: Tuesday, August 14, 2007 8:19 AM
> To: qt
> Subject: How to Center an application ?
> 
> Hello,
> 
> How do I need to center the application when it start up ?
> 
> I am working on Suse Linux 10.2 with Qt 4.3.
> 
> Thanks,
> -Joshua
> 
One thing to be aware of...  You will be getting the geometry on each
screen (for a multi-screen desktop) its easy to get the screen of the
application.. However, if you want to center across everything, you will
need make multiple calls

Scott

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Message 6 in thread

Here's a bit of code I wrote a few months ago :

void centerWidgetOnScreen (QWidget * widget) {
     QRect rect = QApplication::desktop()->availableGeometry();

     widget->move(rect.center() - widget->rect().center());
}

Just use centerWidgetOnScreen(this) in your window constructor.

It should do the work nicely

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Message 7 in thread

On 08-28-2007 5:31 AM, "Clément BOURGEOIS" wrote:

> Here's a bit of code I wrote a few months ago :
> 
> void centerWidgetOnScreen (QWidget * widget) {
>      QRect rect = QApplication::desktop()->availableGeometry();

You really should use:

   QRect rect = QApplication::desktop()->availableGeometry(widget);

So that you get the rectangle of the screen the widget is on, not the whole
desktop (which might be several screens). Otherwise you risk having part
(even possibly all) of your widget outside a viewable area.

>      widget->move(rect.center() - widget->rect().center());
> }
> 
> Just use centerWidgetOnScreen(this) in your window constructor.
> 
> It should do the work nicely


Keith
**Please do not reply to me, reply to the list.**


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Message 8 in thread

This (below) is quite a nice way to do it, because the app starts out
maximised, but minimises to a sensible size, centred.

You might want to replace the hardcoded values with something more
sensible...

XCORRECTION and YCORRECTION are a bit of a hack -- availableGeometry
doesn't quite get the width and height right (or am I doing something
wrong?)

const int MAXWIDTH = 1000, MAXHEIGHT = 800, XMARGIN = 100, XCORRECTION =
5, 
   YMARGIN = 100, YCORRECTION = 30;
const int desktopWidth =
QApplication::desktop()->availableGeometry().width() - XCORRECTION;
const int desktopHeight =
QApplication::desktop()->availableGeometry().height() - YCORRECTION;
const int widgetWidth = QMIN(MAXWIDTH, desktopWidth - XMARGIN * 2);
const int widgetHeight = QMIN(MAXHEIGHT, desktopHeight - YMARGIN * 2);
setGeometry((desktopWidth - widgetWidth) / 2, (desktopHeight -
widgetHeight) / 2, 
   widgetWidth, widgetHeight);
setWindowState(Qt::WindowMaximized);

For multiple windows, you'll need to tweak this a bit.

Sam Dutton


 





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-----Original Message-----

From: Joshua Robinson [mailto:shooki.robinson@xxxxxxxxx] 
Sent: Tuesday 14 August 2007 16:19
To: qt
Subject: How to Center an application ?

Hello,

How do I need to center the application when it start up ?

I am working on Suse Linux 10.2 with Qt 4.3.

Thanks,
-Joshua

--
 [ signature omitted ]