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Thread: Refresh bounds of jLabel

  1. #1
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    Default Refresh bounds of jLabel

    Hi there.

    I have a custom JTree with a custom TreeCellRenderer. My TreeCellRenderer extends the DefaultTreeCellRenderer from swing.
    Everything works fine except for one thing, when an Item in my TreeModel changes its name the bounding box of the labels that are used to render the cells in the tree dont change.

    To give you an example, when my Item's toString() method returns "This is a long item name" after creation the label with have a rather large bounding box. When I then change the name to "short" the text in the tree correctly updates to the new name, but the bounding box is still the same size.
    So when the item is selected in the tree the highlight will be huge.

    Even worse is when the name was short at the beginning and became bigger later on. In this case the full name is not shown at all, instead it shows just "...".

    Here is the code I use for the TreeCellRenderer:
    	public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
    		Component result = super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
     
    		if (result instanceof JLabel) {
    			JLabel label = (JLabel) result;
     
    			if (value instanceof SourceBrowserNode) {
    				SourceBrowserNode node = (SourceBrowserNode) value;
    				boolean error = node.getSource().getErrors().exists();
    				boolean changed = node.getSource().hasChanged();
     
    				Color textColor = error ? leafColor_error : ( changed ? leafColor_changed : leafColor_normal );
    				label.setForeground(textColor);
     
    				if (node.isLeaf()) {
    					Icon icon = error ? leafIcon_error : leafIcon_noError;
    					label.setIcon(icon);
    				}
    			}
    		}
     
    		return result;
    	}

    Heres pictures of the problem in action:

    After the item was created:
    image1.png

    When the name is made smaller afterwards:
    image2.png

    When the name is made longer afterwards:
    image3.png


    Thank you very much for the help.


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    Default Re: Refresh bounds of jLabel

    Try calling nodeChanged(TreeNode node) on the TreeModel backing the JTree (nodeChanged is actually defined in the DefaultTreeModel class), passing the node you wish to refresh as the parameter.

  3. #3
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    Default Re: Refresh bounds of jLabel

    Ah, got it. You were right, that was the problem.

    Actually I had been using a custom tree model and I had implemented a method to notify the listeners but I had an error in that method and the listeners were not correctly informed about the change.

    Thank you very much.

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