Alternative to mouse wheel

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Enter SceneViewer/SceneComposer
2. Try to zoom in/out without a mouse wheel

What is the expected output? What do you see instead?
Unfortunately there's no button combination or method to zoom in/out when the 
mouse input being utilized does not support a mouse wheel. On portable 
computers / laptops the presence of a mouse wheel cannot be expected and thus 
an alternative solution should be provided to those users.

Original issue reported on code.google.com by ShadowIs...@gmail.com on 1 Aug 2011 at 3:51

[GoogleCodeExporter]

Thinking about it...isn't there a 2 fingers gesture on lap tops that emulate 
the mouse wheel?
Or maybe that just triggers the scroll event?

Original comment by remy.bou...@gmail.com on 1 Aug 2011 at 10:53

[GoogleCodeExporter]

I also say wasting precious screen space for buttons that are only used by 
people using laptops from stone age or unable to configure the pad right isn't 
really cool. Theres really no laptop out there today that has no wheel function.

Original comment by normen667 on 2 Aug 2011 at 6:51

[GoogleCodeExporter]

Even if wheel function is supported it might be tedious because you have to 
drag the side of the touchpad which might accidently activate some other 
function.
I expect the alternative would be something like "Ctrl + Right click" would 
work as zoom. Please do not add additional buttons to the gui

Original comment by ShadowIs...@gmail.com on 2 Aug 2011 at 4:32

[GoogleCodeExporter]

So now we are supposed to fix bad input concepts of laptops? What about macs, 
they only have one mouse button by default, we cover that too? I think we can 
expect people to have a mouse wheel or get a proper mouse if they dont.

Original comment by normen667 on 2 Aug 2011 at 4:37

[GoogleCodeExporter]

Original comment by normen667 on 7 Aug 2011 at 12:04

• Changed state: WontFix