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How to correctly register an Action on the GridRegion.Body Mouse.RMB [message #1811248]

Thu, 29 August 2019 12:43

Ludwig Moser

Messages: 476
Registered: July 2009

Senior Member

Hello,

i'm trying to react on user interaction on the GridRegion.Body

when the user clicks RIGHT_BUTTON, an Action/Command shall be executed, as this populates information needed in the popup menu.

i tried registering the PopupMenuAction like this:

uiBindingRegistry.registerMouseDownBinding(new MouseEventMatcher(
				SWT.NONE, GridRegion.BODY, MouseEventMatcher.RIGHT_BUTTON),
				new SelectPopupMenuAction(natTableWrapper, bodyHeaderMenu, selectionLayer));

Note that

class SelectPopupMenuAction extends AbstractMouseSelectionAction

it selects the row (if the Mouse was above an Row) executes some more code then opens the PopupMenu.
this is all working, but it only pops up, if the Mouse was above an area where Items are listed.
I need this Action to be triggered when no Item is below too!
As if no Item is below i need to clear a property in my Application.

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Re: How to correctly register an Action on the GridRegion.Body Mouse.RMB [message #1811264 is a reply to message #1811248]

Thu, 29 August 2019 19:14

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

The default MouseEventMatcher implementation is only working if regionLabels are available. But a LabelStack is only available on cells. So if you click in a region without cells, the MouseEventMatcher will never match.

Therefore you need to implement a custom IMouseEventMatcher that can handle this scenario. But remember that you will get a -1 for the row position that needs to be handled.

new IMouseEventMatcher() {
    @Override
    public boolean matches(NatTable natTable, MouseEvent event, LabelStack regionLabels) {
        boolean eventRegionMatches = ((natTable != null && regionLabels == null)
                || regionLabels != null && regionLabels.hasLabel(GridRegion.BODY));

        boolean buttonMatches = event.button == MouseEventMatcher.RIGHT_BUTTON;

        return eventRegionMatches && buttonMatches;
    }

}

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