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Filter selection within a TreeGrid

Posted on December 1, 2011
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Every node within a TreeGrid can be selected. But sometimes you only need the leafs or only a few of them. It is possible to filter the selection later, just before you execute an action on the selected nodes. But the better way is to prevent a selection on obsolete nodes. Use a custom SelectionModel for that.

public class CustomSelectionModel extends GridSelectionModel<ModelData> {

	public CustomSelectionModel() {
		addListener(Events.BeforeSelect, new NoSelectionListener());
	}

	private class NoSelectionListener
		implements Listener<SelectionEvent<ModelData>> {

		@Override
		public void handleEvent(SelectionEvent<ModelData> se) {
			ModelData model = se.getModel();
			if (model instanceof Something) {
				se.setCancelled(true);
			}
		}

	}
}

You can also use properties of the model to make a decision, but sometimes you can simply ask for the instance type (i.e. folders and files).

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Bold font on TreeGrid

Posted on December 1, 2011
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You can have a bold font on a TreeGrid. Create your own renderer and enhance the HTML returning by the renderer.

private class BoldGridCellRenderer extends TreeGridCellRenderer<ModelData> {
	protected String getText(TreeGrid<ModelData> grid, ModelData model, String property, int rowIndex, int colIndex) {
		return "<span style=\"font-weight:bold\">" + super.getText(grid, model, property, rowIndex, colIndex) + "</span>";
	}
}

Add the renderer to your tree column (use always TreeGridCellRenderer for that column!).

ColumnConfig name = new ColumnConfig("name", "Name", 300);
name.setRenderer(new BoldGridCellRenderer());
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