Natural scrolling is backwards for knobs, spinboxes

[tresf]

Quoting #5360 (comment):

the mouse-wheel emulation is completely bazaar on Mac (disregarding the reverseness), the scrolling emulates a list/document moving at an animated pace. This isn't how it behaves in apps like GarageBand [...] whereas the LMMS MASTER VOLUME SLIDER works properly with this gesture but the knobs and spinboxes do not. This may mean we have a bug somewhere?

[PhysSong]

Qt 5.7 provides QWheelEvent::inverted() which allows checking for natural scrolling. FYI, LMMS currently requires Qt 5.6.

[tresf]

Qt 5.7 provides QWheelEvent::inverted() which allows checking for natural scrolling. FYI, LMMS currently requires Qt 5.6.

Why does the master volume work just fine though?

[PhysSong]

Because QAbstractSlider uses that by default.

[tresf]

Because QAbstractSlider uses that by default.

So a precompiler check plus the inverted should do it?

[PhysSong]

Copied from #5510:

File	Needs Flip
src/gui/editors/AutomationEditor.cpp	✅(excluding horizontal scroll)
src/gui/editors/PianoRoll.cpp	✅(note panning)
src/gui/editors/SongEditor.cpp	✅(excluding horizontal scroll)
src/gui/widgets/ComboBox.cpp	✅
vsrc/gui/widgets/Fader.cpp	✅
src/gui/widgets/Knob.cpp	✅
src/gui/widgets/LcdSpinBox.cpp	✅
src/gui/widgets/TabWidget.cpp	✖️(no, but could use proper card-swipe support)
src/tracks/Pattern.cpp	✅(Velocity for beat/bassline editor)

@tresf Said:

I'm not sure about where the delta() is used for some of the editors. If it's scrubbing/scroll bars, that's behaving properly, but I notices that note panning on Piano Roll needs it so I might be missing something.