swt - Eclipse OwnerDrawLabelProvider 使选择背景为深蓝色

Question

我目前正在开发 Eclipse RCP 应用程序，并且需要使用 OwnerDrawLabelProvider作为 TableViewerColumn 的 CellLabelProvider这是因为当我使用任何其他 CellLabelProvider 时，使用的图像没有居中。

My problem is that when the row is selected, the background of the cell that has this provider is of a darker blue than all the other cells.

这是“选中”状态的样子:

这是我的 OwnerDrawLabelProvider:

class SomeLabelProvider extends OwnerDrawLabelProvider {
            private static final int smallColumnSize = 70;

            @Override
            protected void measure( Event event, Object element ) {
                Rectangle rectangle = IMAGE_CHECKED.getBounds();
                event.setBounds( new Rectangle( event.x, event.y, smallColumnSize, 
                                                              rectangle.height ) );
            }

            @Override
            protected void paint( Event event, Object element ) {
                Rectangle bounds = event.getBounds();
                //paint icon at the center
                event.gc.drawImage( getImage( element ),
                                    bounds.x + ((smallColumnSize - 
                                    IMAGE_CHECKED.getBounds().width) / 2),
                                    bounds.y );
            }

            //this is implemented somewhere else
            protected abstract Image getImage( Object element );

        }

提前致谢!

Answer 1

这是由默认的 erase 方法引起的，JavaDoc 说:

Handle the erase event. The default implementation colors the background of selected areas with SWT.COLOR_LIST_SELECTION and foregrounds with SWT.COLOR_LIST_SELECTION_TEXT. Note that this implementation causes non-native behavior on some platforms. Subclasses should override this method and not call the super implementation.

所以只需添加一个什么都不做的erase覆盖:

@Override
protected void erase(Event event, Object element) 
{
  // Don't call super to avoid selection draw
}