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POSWT: Table with cells that span columns
 

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  1. POSWT: Table with cells that span columns
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    <p>In a Java desktop app with SWT-based GUI, we have a table in which some rows must span multiple columns. This was solved with the approach shown in this official SWT Snippet: <a href="http://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet239.java" rel="nofollow noreferrer">Snippet239.java</a></p> <p>However, much later it was discovered that there's a major problem with this approach on Ubuntu with the default Ambiance/Radiance theme: There are always vertical lines between the columns, even for cells that span multiple columns. This is shown in the following screenshots:</p> <p><img src="https://i.stack.imgur.com/VyOvj.png" alt="Ubuntu with Ambiance/Radiance theme"></p> <p><img src="https://i.stack.imgur.com/UkjsO.png" alt="Ubuntu with Clearlooks theme"></p> <p>As you can see, in the first screenshot there's a vertical line between Column 1 and Column 2. Does anybody have an idea how to get rid of these lines?</p> <p>We've already tried the following:</p> <ul> <li><code>Table.setLinesVisible(false)</code>: Doesn't work, the vertical lines don't go away.</li> <li>Use owner-draw-based label providers to draw over those vertical lines: Doesn't work, the vertical lines seem to be drawn on top of everything that is drawn by the label providers.</li> <li>Attach paint listener to table to draw over the vertical lines: Doesn't work, because there are lots of glitches whenever the table is scrolled or otherwise updated.</li> <li>The <a href="http://www.eclipse.org/nebula/" rel="nofollow noreferrer">Nebula project</a> has a Grid widget where cells can span multiple columns, and it doesn't have a problem with vertical lines, because the entire table is drawn non-natively. However, we can't justify the effort to replace our table with a Grid widget just to fix the vertical lines problem on a particular platform with certain themes. Also, the Grid widget seems to be a pre-release alpha version.</li> </ul> <p>Based on the things we've already tried, I assume the only way left is to muck around in the platform-specific internals of SWT, but I don't even know where to start with something like that.</p>
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    1. COSounds like this bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=138909 which doesn't see to have much movement on it. One thing you should do, as well as looking at workarounds, is to bump this bug.
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    2. COIs this the same method you meant by setLinesVisible? table.setShowGrid(false);
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    3. CO@Logan: The SWT Table widget doesn't have a setShowGrid method, AFAIK. Perhaps you mean the JTable from Swing?
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