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Difference between region labels and config labels? [message #1625568]

Fri, 20 February 2015 13:35

Nils Ruhr

Messages: 9
Registered: January 2015

Junior Member

Hi,

every cell in my table can have a differnt type of expression. I use config labels to tag the type. For this I override the getConfigLabelsByPosition-method and add my own labels.

Now I've noticed, that the CellEditorMouseEventMatcher uses "region labels" via the getRegionLabelsByXY-method to match the event.

Why are there two types of labels?

Thx, Nils.

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Re: Difference between region labels and config labels? [message #1625645 is a reply to message #1625568]

Fri, 20 February 2015 14:37

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Quote:

For this I override the getConfigLabelsByPosition

Why is everybody overriding getConfigLabelsByPosition() instead of using IConfigLabelAccumulator? Is it too complicated to create and use the accumulator compared to anonymously overriding internal methods?

No one ever explained to override getConfigLabelsByPosition(). In my tutorials I always talk about the IConfigLabelAccumulator.

https://www.eclipse.org/nattable/documentation.php?page=styling
http://www.vogella.com/tutorials/NatTable/article.html#architecture_labels

Nevertheless, that's not your question, although IMHO overriding the method is the wrong way to go because you might loose necessary labels.

The region labels are used for layer compositions to identify the region you are in. This is necessary for example to identify the action bindings for a region, since e.g. a click in the column header triggers a column selection while a click in a cell only selects the cell.

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Re: Difference between region labels and config labels? [message #1630607 is a reply to message #1625645]

Mon, 23 February 2015 09:31

Nils Ruhr

Messages: 9
Registered: January 2015

Junior Member

Thank you! The tutorial is very helpfull. I will change my code accordingly.

Is it possible to add custom labels to the region labels in the same manner as adding config labels? My use case is:
- For one type of expression I want to activatate the cell editor on a single click.
- For another type of expression I want to activate the cell editor on a double click.

The code I use looks similar to this one:

CellEditorMouseEventMatcher matcher = new CellEditorMouseEventMatcher(expressionType)
if(expressionType.equals(...)) {
uiBindingRegistry.registerDoubleClickBinding(matcher, new MouseEditAction());
} else {
uiBindingRegistry.registerSingleClickBinding(matcher, new MouseEditAction());
}

However the IMouseEventMatcher works only for regionLabels. The ideal solution would be to have my config labels apply to the region labels.

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Re: Difference between region labels and config labels? [message #1630641 is a reply to message #1630607]

Mon, 23 February 2015 09:57

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

No, and you shouldn't override or adjust the region labels!

Sounds more like you need a custom matcher. Why don't you extend the CellEditorMouseEventMatcher and add an additional check for cell labels. Like, if you are in the body, there is an editor (this is what the CellEditorMouseEventMatcher does) AND the cell label stack contains your single/double click label ...

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