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Laying out optional visual elements [message #484310]

Sun, 06 September 2009 09:04

Indigo Mising name

Messages: 14
Registered: August 2009

Junior Member

Hi,

I a node where the model elements (FirstName, MiddleName, LastName) are displayed using labels, for example:

John
Joseph
Smith

But if the model element behind any of the labels has no content, I don't want display that label at all. For example, if there is no middle name, I would like to see:

John
Smith

But not:

John
<blank>
Smith

This seems like a pretty simple requirement, but I'm struggling.

Any suggestions would be appreciated. Thanks.

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Re: Laying out optional visual elements [message #484364 is a reply to message #484310]

Mon, 07 September 2009 08:47

Indigo Mising name

Messages: 14
Registered: August 2009

Junior Member

I'd like to take a shot at answering my own question, but I'd still appreciate any feedback as to whether this is a good approach or not.

Here's what I did (real class names this time, the earlier post was a simplified example):

The EditPart for the node is FeatureEditPart, and this class contains a WrappingLabel member for each label. The first label is fFigureFeatureNameFigure. The corresponding EditPart for this label is FeatureNameEditPart.

I added two methods to FeatureEditPart, removeName and addName. Each method simply removes the label from the figure, but does not destroy it:

public void removeName(){			
    this.remove(fFigureFeatureNameFigure);
}
		
public void addName(){
   if(!this.getChildren().contains(fFigureFeatureNameFigure)){
      this.add(fFigureFeatureNameFigure,0);	
   }
}

In FeatureNameEditPart.refreshLabel, I added a check to see if the label text is blank and call the parent class (FeatureEditPart) removeName or addName accordingly.

It would be preferable to do this without coding (e.g. via gmfgraph/gmfmap), but I presume that's not an option.

Any feedback or alternatives appreciated.

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