1528: Scroll and adjust zoom level of zoom view with mouse wheel

[rpeterman-gp]

Closes #1528

• enable mouse wheel scrolling on zoom view
• add wheel handler to adjust zoom level with scroll wheel + alt key
• update zoom level scale calculations to always use powers of 2

[brandonhundt]

@rpeterman-gp When I scroll using alt + mousewheel when editing clips, it works perfectly.

However, when I scroll using alt + mousewheel in the Episode > Media Files waveform editor, the mousewheel still scrolls both the page and zooms the waveform (the page area exceeds the screen).

I suspect you might need to disable page scrolling when alt is pressed??

[rpeterman-gp]

@rpeterman-gp When I scroll using alt + mousewheel when editing clips, it works perfectly.

However, when I scroll using alt + mousewheel in the Episode > Media Files waveform editor, the mousewheel still scrolls both the page and zooms the waveform (the page area exceeds the screen).

I suspect you might need to disable page scrolling when alt is pressed??

Good catch. Easy fix. Guess none of my waveform pages needed to scroll during development.

[brandonhundt]

This looks great @rpeterman-gp Thank you!