CODEWITHSUNDEEP
windowsdelphistatusbarvcltext-rendering
Andreas Rejbrand
Andreas Rejbrand

Reputation: 108929

Blurred text in the TStatusBar control

I have for a very long time experienced a hugely annoying problem with the TStatusBar VCL control, a thin wrapper around the Win32 status bar control.

Since this appears to me as a very common and frustrating issue, I am very surprised Google (and StackOverflow) doesn't seem to know much about it.

The problem is that the status bar text becomes very blurred when it hasn't changed for a while; the precise conditions are still unknown to me. But I see this every day:

Screenshot of blurred status bar

If one of the panels has its text updated, the new text is rendered correctly (see last panel):

Screenshot of partially blurred status bar

Is this something that only happens when I am in the vicinity of running Delphi processes, or is it indeed a known issue? More importantly, is there a known cure? (And, academically, why does this happen? It wouldn't surprise me if it is related to transparent drawing of anti-aliased text by code originally designed for unthemed Win9x.)

I have tried to enable double-buffering, but I am not sure if that completely resolves the issue. (I have seen even worse behaviour in non-double-buffered list view controls, which is resolved by making them double-buffered.)

Upvotes: 4

Views: 267

Answers (1)

Andreas Rejbrand
Andreas Rejbrand

Reputation: 108929

I made all status bars in my applications double-buffered a week ago, and I haven't seen any blurred text in any of them since then. Previously, I saw severely blurred text daily. Hence, it seems like this issue - whatever is causing it - can be fixed by making the status bars double buffered.

Upvotes: 2

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