CODEWITHSUNDEEP
eclipseeclipse-pluginswtjfacercp
Naveenchandra Patil
Naveenchandra Patil

Reputation: 19

How to change SWT Table Item selection background color

I have a similar use case as mentioned here. I want to change the SWT Table Item selection background color from default grey or blue to some other color. I tried using the StyledCellLabelProvider#update method but it was of no use. It simply updates the background color for all table items to the given color. But I need it to be only for the selected item. Below is the code Snippet of my label provider update method

@Override
public void update(ViewerCell cell) {
    cell.setText(provider.getDisplay((T) cell.getElement(), cell.getColumnIndex()));
    TableItem currentTableItem = ((TableItem) cell.getViewerRow().getItem());
    if (currentTableItem.getParent().getSelectionCount() > 0) {
        TableItem selectedTableItem = currentTableItem.getParent().getSelection()[0];
        if(currentTableItem == selectedTableItem) {
            cell.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_LIST_SELECTION));            
        }
    }
    cell.setForeground(provider.getDisplayColor((T) cell.getElement(), cell.getColumnIndex()));
    super.update(cell);
}

Thanks in advance for the help!

Upvotes: 1

Views: 990

Answers (1)

greg-449
greg-449

Reputation: 111142

The selection colour is normally chosen by the OS, so to change the colour you have to turn off the selected flag in the StyledCellLabelProvider erase, measure and paint methods. You also have to draw the selection colour yourself in the erase method.

Something like the following:

  @Override
  protected void erase(final Event event, final Object element)
  {
    if ((event.detail & SWT.SELECTED) != 0) {
      event.detail &= ~SWT.SELECTED;
  
      Rectangle bounds = event.getBounds();

      event.gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_LIST_SELECTION));
   
      event.gc.fillRectangle(bounds);
    }

    super.erase(event, element);
  }

  @Override
  protected void measure(final Event event, final Object element)
  {
    event.detail &= ~SWT.SELECTED;

    super.measure(event, element);
  }

  @Override
  protected void paint(final Event event, final Object element)
  {
    event.detail &= ~SWT.SELECTED;

    super.paint(event, element);
  }

Upvotes: 2

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