Map mouse controls to trackpad

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Original report (archived issue) by Steffi Paepcke (Bitbucket: spaepcke).

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For casual use, it would be good to provide users with the same mouse controls they get with the 3-button mouse

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Original comment by John Hsu (Bitbucket: hsu, GitHub: hsu).

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Thanks, this will be very useful. For mac book pros, middle click drag is not always available.

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• set assignee_account_id to "557058:095b1e12-74ed-4e20-b44f-2f0745b616e0"
• changed assignee from "None (Bitbucket: None)" to "nkoenig (Bitbucket: nkoenig, GitHub: nkoenig)"

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Original comment by Steffi Paepcke (Bitbucket: spaepcke).

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We should avoid using Alt. We need to look into what the proper keyboard mapping would be.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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How about Shift+Left Click dragging as an alternative to middle click dragging? I've implemented this in branch trackpad_rotate.

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "new" to "on hold"

Until 2.0

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Original comment by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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• changed state from "on hold" to "open"

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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pull request #941

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed assignee_account_id from "557058:095b1e12-74ed-4e20-b44f-2f0745b616e0" to "557058:5de38267-b118-494c-aa76-4fab35448816"
• changed assignee from "nkoenig (Bitbucket: nkoenig, GitHub: nkoenig)" to "scpeters (Bitbucket: scpeters, GitHub: scpeters)"

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Original comment by Steffi Paepcke (Bitbucket: spaepcke).

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Hmm I can't remember why I said we shouldn't use Alt as the modifier...can anyone think of a reason?

Unity uses Alt + Click/drag to rotate.

I'll look into this a little more today/tomorrow.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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Another interesting idea is holding down space while click-dragging, since the space bar is so close to the trackpad.

This will be more difficult to implement, since the MouseEvent doesn't have info about the space bar.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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• changed state from "open" to "resolved"

hold down Shift while click dragging to rotate the 3D window
pull request #941

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• set version to "all"

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "resolved" to "closed"