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[platform-swt-dev] Cocoa Buttons and vertical size
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Hi everyone,
I thought I'd help out with the Cocoa port. So far I have submitted a
patch for
https://bugs.eclipse.org/bugs/show_bug.cgi?id=223390
and I'm working on
https://bugs.eclipse.org/bugs/show_bug.cgi?id=223391
I noticed that Cocoa push buttons don't support changing their
vertical size, and in Carbon there is a workaround by changing the
button style to flat, since flat buttons can be resized vertically. I
am having a hard time to find out where this change in style is
happening though - could someone give me a pointer? Does it happend
somewhere in the Button class or is the layout manager responsible?
Also, in order to properly implement Button#computeSize(int, int,
boolean), I had to implement Control#textExtent(NSAttributedString,
int). I am using the Cocoa Text system for this, but that means
creating a bunch of Cocoa objects each time the method is called.
These objects can easily be reused to speed things up. I am wondering
which of the following approaches is best:
- Store the objects as instance variables of the control object.
- Create an extra Class that offers a simpler interface for these
kinds of calculations and store an instance of this class as an
instance variable. (In which package should a utility class like this
exist?)
- Don't use instance variables anywhere and do something else.
I'd be very thankful if some more experienced SWT programmers could
give me some pointers.
Best regards
Kristian