[platform-swt-dev] Table cell tooltip problem

[Alexander Saar <alexander.saar@xxxxxxxxxxxxxx>]

Hi everbody,
I have a question regarding the tooltip support for table cells.

I recently updated to SWT 3.3M5 and tried the new tooltip feature for 
table cells. Following the API docs, I created a CellLabelProvider with 
support for tooltips and added it to a ViewerColumn:


// create table viewer
taskTableViewer = new TableViewer(table);

// create columns
TableColumn titleCol = new TableColumn(table, SWT.NONE);
titleCol.setResizable(false);
titleCol.setWidth(100);
titleCol.setText("Title");

TableViewerColumn vCol = new TableViewerColumn(taskTableViewer,
                        titleCol);

vCol.setLabelProvider(new TaskTableLabelProvider());
taskTableViewer.setColumnPart(vCol, 0);


After starting my application, I didn't get any output in my table. 
After some debugging, I found out that the getColumnText() method is 
never called. (same holds true for getColumnImage()).

After that I tried to add the label provider additionally to my TableViewer.


TaskTableLabelProvider provider = new TaskTableLabelProvider();
taskTableViewer.setLabelProvider(provider);


This results in having the original cell text display. If I hover over 
the cell, an empty tooltip gets display. Again I started the debugger 
and found out, that a default instance of CellLabelProvider is called 
(wich returns null) by the framework and not my specialized implementation.

Any hint what I did wrong or how I can fix this problem?

Best regards,
Alex

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