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From: Cecil Westerhof <Cecil@decebal.nl>
Newsgroups: comp.lang.java.gui
Subject: Re: How to select the monitor a shell is put on (SWT)
Date: Sun, 18 Mar 2012 11:36:37 +0100
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Op zaterdag 17 mrt 2012 21:56 CET schreef Jeff Higgins:

> On 03/17/2012 09:08 AM, Cecil Westerhof wrote:
>> I am learning to work with SWT. I have two monitors. How can I select
>> the monitor where a Shell is instantiated?
>>
> I don't know about that. But you can locate a shell using
> Display.getMonitors(), and then Monitor.getClientArea(),and
> Shell.setLocation().

I first used:
	Rectangle bds = shell.getMonitor().getBounds();
	Point     p   = shell.getSize();

	int nLeft = (bds.width - p.x)  / 2;
	int nTop  = (bds.height - p.y) / 2;

	shell.setBounds(nLeft, nTop, p.x, p.y);

On your tip I used:
	Monitor primary = display.getPrimaryMonitor ();
	Rectangle bounds = primary.getBounds ();
	Rectangle rect = shell.getBounds ();

	int x = bounds.x + (bounds.width - rect.width) / 2;
	int y = bounds.y + (bounds.height - rect.height) / 2;
	shell.setLocation (x, y);

But that had the same effect.

In debug mode I found that an object of type Monitor has the following
fields:
    clientHeight
    clientWidth
    clientX
    clientY
    handle
    height
    width
    x
    y

Sadly no identifying information.

With display.getMonitors() I found out that the first monitor
contains:
    1680
    2650
    0
    0
    0
    1680
    1050
    0
    0

And the second:
    900
    1600
    1050
    0
    1
    900
    1600
    1050
    0

So the first has in client Height/Width the combined values and the
second only its own. I want my shell on the second one, so I need to
use:
	Monitor[] monitors = display.getMonitors();
	Monitor monitorToUse = monitors[1];
	Rectangle monitorRect = monitorToUse.getBounds();
	Rectangle shellRect = shell.getBounds();
	int x = monitorRect.x + (monitorRect.width - shellRect.width) / 2;
	int y = monitorRect.y + (monitorRect.height - shellRect.height) / 2;
	shell.setLocation (x, y);

Now I have to build something that can save the preferred monitor.
(Including checks if it refers to a still existing one.)

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof