Handling zooming (pinch) with mouse (multi-touch gestures) on OS X

[Mojca M. <moj...@gm...>]

Hello,

I would like to ask just for a few pointers, not any real code.
Gnuplot supports Shift+scroll up/down to move left/right on the graph.

However the trackpad on Mac OS X is capable of scrolling left/right as
well, as well as zooming in/out. That would be a lot more handly than
trying to remember which key to press along with a mouse.

Here are some references from Apple & Qt documentation for zoom in/out (pinch):

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSResponder_Class/Reference/Reference.html#//apple_ref/occ/instm/NSResponder/magnifyWithEvent:

http://doc.qt.nokia.com/4.7-snapshot/qpinchgesture.html
http://doc.qt.nokia.com/4.7-snapshot/gestures-overview.html

... ok, maybe after all I was wrong about horizontal scrolling if I'm
looking at the right document:
https://bugreports.qt.nokia.com/browse/QTBUG-9054, but at least pinch
should work.


My question is: where exactly could I plug in the Cocoa or Qt code if
I want to play with gestures? In particular, I don't understand where
for example GE_buttonrelease comes from (what triggers it).

Mojca

PS: Qt terminal is a tiny bit buggy. Scrolling left/right results in
scrolling of graph up/down. Even if scrolling left/right is not yet
supported, it should at least not try to be clever and scroll up/down.