[win32] Do not invert the pixels for the Button focus rectangle - #3543
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With a custom foreground SWT paints the button content itself, and drew the focus rectangle with DrawFocusRect(), which XOR-inverts the pixels below it. On background #0071BC that gave a #FF8E43 rectangle, on mid-gray it was invisible. Use a dotted pen in the foreground color instead, the color the button text already uses. Geometry is unchanged. Adds Snippet395.
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How the focus rect will look like - dotted or a solid line? |
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When a
Buttonhas a custom foreground, SWT paints the button content itself and therefore also paints the focus indication. It usedDrawFocusRect(), which XOR-inverts the pixels below it, so the focus rectangle takes on whatever the complement of the background happens to be. On a button styled with background#0071BCand white text the rectangle came out as#FF8E43, and on a mid-gray background it is close to invisible, which makes the focus indicator unreliable.The rectangle is now drawn with a dotted pen in the foreground color, the same color the button label uses, so it is legible on whatever surface the label is legible on. The rectangle geometry, the background fill and the path where only a background is set are unchanged, so unstyled buttons and the default Eclipse theme look exactly as before.
Snippet395demonstrates the case. This is win32-only code and I could only compile it on Linux, so a visual check on Windows 11 is still needed, which is why this is a draft.