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View construction without making them active first [message #1828958]

Tue, 23 June 2020 08:33

Ari Hannula

Messages: 2
Registered: June 2020

Junior Member

Hello, I have a problem in the following situation:

I have an Eclipse 4 plugin, where I have a custom perspective with many view Parts and Part Stacks etc. When the perspective is loaded, many views are brought visible but many are also stacked under those visible view parts. Those (hidden) views use ESelectionService and are supposed to be listening to other views' selections. Those selection events fill the views with data.

The problem is that since the views are hidden under the stack of other (visible) views, their constructors are not run when the perspective is activated, therefore any events coming from ESelectionService is not working (since the ESelectionService.addSelectionListener() is called in the @PostConstruct). So the views are empty when first activated. Of course, after I click those views and make them visible, constructor is called and all is fine after that. In my fragment.e4xmi the Parts have To Be Rendered and Visible checked.

How could I make those views be constructed even when they are not first clicked visible, so that they will always get the selection events? Or is that even possible? Or maybe there is some workaround?

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Re: View construction without making them active first [message #1828972 is a reply to message #1828958]

Tue, 23 June 2020 13:24

Rolf Theunissen

Messages: 260
Registered: April 2012

Senior Member

Instead of start listing to selection changes from the start of the workbench, you could get the active selection when the view is opened, i.e. ESelectionService.getSelection()

But you are using injection, instead of listening to selection changes you should be able to have the selection injected for you:

@Inject
private void setSelection(@Optional @Named(IServiceConstants.ACTIVE_SELECTION) MyClass selection) {
    this.selection = selection;
}

If you really want to have the non-visible parts created, you have to take a look at EPartService#showPart(myPart, PartState.CREATE);

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Re: View construction without making them active first [message #1829053 is a reply to message #1828972]

Wed, 24 June 2020 11:26

Ari Hannula

Messages: 2
Registered: June 2020

Junior Member

Yes thank you for the tip. Now the code is cleaner and the views always get the selection data when opened.

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