JFace TableViewer draw a rectangle on cell like Excel

Question

I am trying to achieve a Excel like functionality in a TableViewer to draw a rectangle in a highlighted cell. Below is the code snippet doing this work, but it is not working completely as only left and top edges are getting drawn and I am not able to understand why the bottom and right edges are getting missed!

Code snippet :

private void markFocusedCell(Event event, ViewerCell cell) {
        GC gc = event.gc;

        event.gc.setAlpha(200);
        event.gc.setForeground(event.display.getSystemColor(SWT.COLOR_RED));

        Rectangle rect = cell.getBounds();

        gc.drawRectangle(rect.x, rect.y, rect.width, rect.height);
        event.gc.setForeground(event.display.getSystemColor(SWT.COLOR_BLACK));

        event.detail &= ~SWT.SELECTED;
    }

Output

Answer 1

您只需要向右上方/下方绘制1像素的底线和底线：

gc.drawRectangle(rect.x, rect.y, rect.width - 1, rect.height - 1);

Answer 2

By the looks of it, the drawn rectangle is as big as the cell, and therefore, it does not fit inside it.

I would try drawing in the following way:

gc.drawRectangle(rect.x, rect.y, rect.width-1, rect.height-1);

Answer 3

如果您想要更多类似Excel的功能，为什么不使用NatTable ？