Matlab ResizeFcn callback
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I am worried about the look and feel of my GUI designed with Matlab. In concrete, I do not like how the figure window resizing is achieved. I have an uitabgroup (tabpanel) inside which there are three panels with border etchedin. Each time the figure is resized, it appears flickering between both positions of the panels. I hate this optical effect. So, I decided to build my own resizefcn callback to get being pleased. However, I realize Matlab first resizes the figure window and then it runs the commands inside the resizefcn callback. I would like to know if there is some solution that lets me to change this behaviour.
3 Kommentare
Walter Roberson
am 27 Feb. 2012
The resize mechanism is ugly. But until such time as MATLAB comes complete with built-in layout functions for the elements ("put this part down here if there is room"), I don't know that anything can be done.
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Jan
am 27 Feb. 2012
Sometimes the resizing looks weird: I have a uitree object on the left side of a GUI. During the resizing movement (mouse hold down, ResizeFcn is not called), the display is as expected, when I have selected the right lower corner of the figure. Then the lower left corner of the uitree keeps its absolute position in the figure, while the size is not changed - not nice, but not confusing.
But when I select the lower or left border of the figure, the uitree behaves funny, e.g. the height is reduced by the double rate than the reduction of the heigth of the figure. The optical impression is as strange as the textual description...
Of course everything is fine, when the ResizeFcn is called after lifting the mouse button. But the "look&feel" during the resizing is awkward.
2 workarounds:
- Close your eyes during resizing. It's time to calm down and take a break from visual impressions.
- Disable the resizing controlled by Matlab, but create a dedicated WindowButtonDownFcn by your own. If the mouse clicks near to the border (or in dedicated objects in the corners), the cursor changes to the appropriate shape and the WindowButtonMotionFcn can control the position of the figure.
3 Kommentare
Jan
am 28 Feb. 2012
If you disable the built-in resizing, it will not impede your own implementation: figure('Resize', 'off');
Then you can e.g. create a WindowButtonMotion function, which modifies the cursor, when the mouse is near to the edge or corners. Then the WindwoButtonDownFcn activates another WindowButtonMotionFcn, when the mouse is pressed near to the border. Then this modified WindowButtonMotionFcn is the actual ResizeFcn and it is triggered whenever the mouse changes its position - not only if it is released.
But this approach will need > 100 lines of code and it might interfer with and existing WindowButtonMotionFcn. Some improper GUI tools might overwrite the WindowButtonMotionFcn and do not restore it - as far as I remember in earlier Matlab versions the zooming was not polite enough.
Weitere Antworten (2)
Walter Roberson
am 27 Feb. 2012
You might be able to reduce the flash grunge by setting the figure visibility to 'off' during the resize process, and then to 'on' again when the resize is finished.
Malcolm Lidierth
am 27 Feb. 2012
If you a using the mouse to resize, the figure will always be updated multiple times because it has multiple sizes between the start and end of the mouse drag. There are any number of solutions. See http://undocumentedmatlab.com/blog/controlling-callback-re-entrancy/
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