Y Zoom and Pan feature
This MR complete users interaction with plot by adding :
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pan action on plot : pan on domain axis was already implemented but pan on value axis wasn't. Instead it was used to scroll through columns. I add pan on value axis and to dissociate both actions, I set cursor position as a condition. If the cursor is over a PlotItem/IntervalPlotItem, then the pan action will move the value axis, if it is over a LegendItem (column header), then the pan action will scroll columns.
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zoom on value axis : the conditions to use this feature are the following : mouse cursor must be on a PlotItem or an IntervalPlotItem, then the control is Ctrl + wheel (zoom on domain axis is on the wheel without Ctrl key)
Edited by Sebastien Peillet