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Centering a Dialog on Screen [message #465049]

Sun, 04 December 2005 17:52

Eclipse User

Hi,
How can I center a dialog or shell on screen? For example, I have a fixed
size custom Dialog, how can I make it appear in the center of the screen?

Thanks.

Re: Centering a Dialog on Screen [message #465051 is a reply to message #465049]

Sun, 04 December 2005 19:15

Eclipse User

Child Shell(s) automatically position themselves exactly centered in the parent Shell (which is usually the desired behavior). To manually center any Shell, use the following snippet:

int width = display.getClientArea().width;
int height = display.getClientArea().height;
shell.setLocation(((width - shell.getSize().x) / 2) + display.getClientArea().x, ((height - shell.getSize().y) / 2) + display.getClientArea().y);

Assuming 'shell' is the local field representing your Shell and 'display' is the local field representing shell.getDisplay(), shell will be perfectly centered on the screen agnostic of platform and screen trim (e.g. Linux panels or PocketPC menubars).

Re: Centering a Dialog on Screen [message #465053 is a reply to message #465051]

Sun, 04 December 2005 20:00

Eclipse User

I tried this code, but it still does not seem centered to me (off to the
top left by quite a bit). I'm using it to try to center a banner that I
load in my program as it loads. So I do have display, and shell is just
the banner that I load.

Do you have any ideas about why it doesn't center?

Thanks.

Re: Centering a Dialog on Screen [message #465055 is a reply to message #465053]

Sun, 04 December 2005 23:03

Eclipse User

Try this instead:

int width = display.getClientArea().width;
int height = display.getClientArea().height;
shell.setLocation((width - shell.getSize().x) / 2, (height - shell.getSize().y) / 2);

I've removed the compensation for platform specific left/top insets. Not sure why it didn't work properly for you. The above code should though.

Re: Centering a Dialog on Screen [message #465073 is a reply to message #465049]

Mon, 05 December 2005 09:21

Eclipse User

Originally posted by: kwpeck.mersoft.com

zinc wrote:
> Hi,
> How can I center a dialog or shell on screen? For example, I have a
> fixed size custom Dialog, how can I make it appear in the center of the
> screen?
>
> Thanks.
>

If you are doing this at startup and you don't have a "good" shell /
display (which I did not with my login dialog) then the following code
will center on the 1st monitor in a multiple monitor setup or only
monitor if you only have a single.

Monitor [] ma = display.getMonitors();
if (ma != null)
m_shell.setLocation((ma[0].getClientArea().width - pixel.width) /
2, (ma[0].getClientArea().height - pixel.height) / 2);

In this case I have the height / width of the dialog stored in the
"pixel" variable.

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