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How to work with custom painters in NatTable? [message #1085668]

Tue, 13 August 2013 07:47

Ali Malik

Messages: 27
Registered: August 2013

Junior Member

I have a scenario where in a single column, the cells either have a Null Editor (No editor) or a Combo Box Editor. I did this using a custom Editor.

Now I cant understand how to use a custom painter, so that the one with Null Editor has a Text Box Painter, and the Combo Box Editor has a Combo Box Painter.

I want to use a custom painter, but there is no documentation available on what method does what in the class that implements ICellPainter.

How can i use thi scustom painter?

Or is there any other better way to do so? If so, what?

Regards,
Ali Ahmad Malik

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Re: How to work with custom painters in NatTable? [message #1085694 is a reply to message #1085668]

Tue, 13 August 2013 08:33

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Why do you need a custom painter to achieve that? You need to register labels according to your use case. For the one label you register the TextCellPainter, for the other label the ComboBoxPainter. No need for a custom painter and no magic. Smile

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Re: How to work with custom painters in NatTable? [message #1091145 is a reply to message #1085694]

Wed, 21 August 2013 05:14

Ali Malik

Messages: 27
Registered: August 2013

Junior Member

Hi Dirk,

What you are trying to say, I assume, is that I have two columns.

But I have only 1 column, and within that column some cells would be using ComboBox Painter, some would be using TextPainter.

I achieved my goal by using a custom painter. In the paintCell method I used the painters as required. Below is a code snippet:

	@Override
	public void paintCell(ILayerCell arg0, GC arg1, Rectangle arg2,
			IConfigRegistry arg3) {
		
		if(arg0.getRowIndex() % 2 == 0 ) {
			textPainter.paintCell(arg0, arg1, arg2, arg3);
		} else {
			comboPainter.paintCell(arg0, arg1, arg2, arg3);
		}

	}

Where

		comboPainter = new ComboBoxPainter();
		textPainter = new TextPainter();

So in this snippet, according to the cell index it either paints it as a TextPainter, or a ComboBoxPainter.

Anyways, thanks for your help, Dirk Smile

Regards,
Ali Ahmad Malik

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Re: How to work with custom painters in NatTable? [message #1091208 is a reply to message #1091145]

Wed, 21 August 2013 07:18

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

No, for those use cases we have the label mechanism. You need to create a cell label overrider that adds special labels to the cell label stack and configure the painters dependent to that labels. This can be done on a per column, per row or per cell base. I did this before and it works like charm. There is no need to implement custom painters that call the real painters by condition.

From the architectural design aspect of NatTable your solution is not correct. It also works, but there is a much more convenient way without the need to implement custom painters as you only need to configure correctly.

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