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Hello, Marc!
>> I've been trying to track down a recently discovered bug in
>> one of my Blackbox programs. So far, it appears to be a bug
>> introduced into the Blackbox framework at v1.5. When I
>> minimize ne of my windows in a particular application, I get
>> a trap.
MM> Following up on my previous message about a possible bug introduced
MM> in Blackbox 1.5, I see that I only enounter this problem if I create
MM> a new view with a ResizePref of horFitToWin=TRUE / verFitToWin=TRUE.
...
MM> In Blackbox 1.5, the following appears in the log:
MM> r = 6130925, b = 3863975
MM> r = 6130925, b = 3863975
MM> r = 2147347123, b = 2147347123
MM> Those huge values in the Blackbox 1.5 log are what's causing
MM> my programs to crash when the window is minimized.
MM> I'd say that this is a bug in Blackbox 1.5...
This is an interesting feature. I looked into it. It turned out that
when a window is minimized its method SetSize is called like this
in HostWindows module:
PROCEDURE (w: Window) SetSize* (width, height: INTEGER);
.......
IF (width = 0) & (height = 0) THEN w.SetSize^(minimized, minimized)
ELSE
w.SetSize^(width, height);
The constant HostWindows.minimized = MAX(INTEGER). That's the source
of problems. Later on, the procedure Views.ValidateRoot tries to
repaint a region with coordinates (0, 0, 2147474123, 2147474123).
I don't know why did they choose to mark minimized window client
area size with biggest available width and height (instead of 0 or
-1).
The solutions is quite simple:
- set constant HostWindow.minimized = 0;
- compile HostWindows;
- restart BlackBox.
Thank you for the bug!
---=====---
Alexander
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy
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Received on Mon Jan 15 2007 - 23:36:29 UTC