Posted by Sean P. DeNigris on May 11, 2015; 12:34am
URL: https://forum.world.st/MouseWheel-events-tp4824839p4825605.html

Matthieu Lacaton wrote

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 ?

That is correct by default, but you can always hack the VM if you reeeeally want that behavior. Also, if you just wait a bit, I'm in the process of remapping the wheel simulation shortcuts to be extremely less likely to conflict with actual keyboard events. It is already done for Mac. I wrote the patch for GNU/Linux & Windows, but didn't have machines available when I was testing (the code may take a bit of massaging to compile). The upside is that it's a backward compatible VM change, so you will be able to take advantage of it in any Pharo version that will run on the latest VMs.

Matthieu Lacaton wrote

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 ?

No, you would code it the same way. In the image, MouseWheelEvents are created regardless of the keyboard event used to simulate them. The only thing different would be the keyboard equivalents.