Smalltalk - Re: MouseWheel events

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Re: MouseWheel events

Posted by Matthieu on May 10, 2015; 8:23pm
URL: https://forum.world.st/MouseWheel-events-tp4824839p4825582.html

Okay, thank you for your answer, but there is one thing I am not sure I understand :

Let's say for example thant I want to create a rectangle on the screen and be able to move it up and down by pressing CTRL + up / down arrow and be able to rotate it with the mouse wheel. Does this mean that on Linux I just can't ?

And does this mean that if I create an application able to react to mouse wheel, I need to code it differently for Windows and for Linux ?

Matthieu

2015-05-06 23:55 GMT+02:00 Sean P. DeNigris <[hidden email]>:

Matthieu Lacaton wrote
> Shouldn't I get a MouseWheel event when i use the wheel and a keystroke
> when I use CTRL + Arrow ?

Yes! But the hack that you discovered is what we have :) It's done well for
us given it's simplicity. But it's far from ideal. For instance, IIRC the
delta is fixed, so scrolling a lot sends a lot of tiny scrolls instead of
more appropriately-sized ones. The keystroke-equivalence differences I think
are due to the underlying platform - the meta key for Mac is CMD, so that is
what's used. I extended the hack recently to get horizontal scrolling, but
it's only implemented for the Mac VM (there is not even corresponding code
in the image yet, pending Windows/Linux implementation). If you trap the
events, you can see that now it's simulating
cmd+alt+ctrl+shift+[up/down/left/right].

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Cheers,
Sean
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