Re: [platform-swt-dev] Tri-state Checkbox

[Thomas Singer <ts-swt@xxxxxxxxxxx>]

Hi Conrad,

Thank you for this information. I have implemented it similarly, but 
wonder why there is no method in SWT's Button class to set the 
listeners. Something along the lines:

public void installTriStateToggling() {
	addListener (SWT.Selection, e -> {
		if (button.getSelection()) {
			if (!button.getGrayed()) {
				button.setGrayed(true);
			}
		} else {
			if (button.getGrayed()) {
				button.setGrayed(false);
				button.setSelection (true);
			}
		}
	});
}

--
Best regards,
Thomas Singer
=============
syntevo GmbH
http://www.syntevo.com
http://www.syntevo.com/blog


On 2017-07-24 20:57, Conrad Groth wrote:
> Hi Thomas,
>
> there is a SWT snippet showing the desired behaviour:
> http://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org
> .eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet315.java
>
> Best regards
> Conrad
>
> -----Ursprüngliche Nachricht-----
> Von: platform-swt-dev-bounces@xxxxxxxxxxx
> [mailto:platform-swt-dev-bounces@xxxxxxxxxxx] Im Auftrag von Thomas Singer
> Gesendet: Montag, 24. Juli 2017 20:13
> An: platform-swt-dev@xxxxxxxxxxx
> Betreff: [platform-swt-dev] Tri-state Checkbox
>
> Hi,
>
> It looks like a checkbox can work in 2 different modes, either toggling
> between selected and unselected, and toggling between tri-state and
> unselected. So my understanding it that to set it programmatically to the
> tri-state mode, I have to invoke
>
>     checkbox.setGrayed(true);
>     checkbox.setSelection(true);
>
> How can I make it switch between selected - unselected - tri-state using the
> mouse? Or should I simulate it myself using mouse-click-listeners?
>
> --
> Best regards,
> Thomas Singer
> =============
> syntevo GmbH
> http://www.syntevo.com
> http://www.syntevo.com/blog
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