| [gef-dev] problem with the size change for DefaultRangeModel |
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Hi, I have been working on the gef’s text sample code to
enhance its functionality. While I was working on scrolling, I have
encountered a problem. The problem is that when a user types a character
at the end of a line AND at the end of the viewport (that means the viewport
should ‘move’ to right so that the typed character gets displayed
on the screen), I can’t scroll the viewport properly. After some
debugging, I have found that when I try to scroll the viewport, the horizontal
range model still has the previous size. I’m using
FigureCanvas.scrollToX (int) to do the scrolling. This method though,
checks the size of the horizontal range model, and returns the max location of
the viewport I can set. But at this point, the range model still contains
the size without the new character inserted; therefore, the viewport is always
off by the new character typed. Here’s how I’m implementing the scrolling. I
have created a class that implements UpdateListener. This one gets
registered to the UpdateManager and my notifyValidating does all the work (it’s
exactly the same work flow as refreshing the caret). The event gets fired
in DeferredUpdateManager.validateFigures() by the call to fireValidating() method.
But the problem is that the size of the horizontal range model is updated
in IFigure.validate() in DeferredUpdateManager.validateFigures() which occurs
AFTER fireValidating()! Since there doesn’t seem to be a way to do anything
after IFigure.validate() in DeferredUpdateManager.validateFigures(), I’m
stuck with this problem. Is this a bug? Shouldn’t the range model
updated earlier? Or is there a workaround that I could use? BTW, I have fixed other scrolling and caret location
problems. Thanks in advance, Takahiro Kato |