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From Stephan Huber, "attached you'll find a first version of multi-touch-support for OS X (>=

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10.6), which will forward all multi-touch events from a trackpad to the
corresponding osgGA-event-structures.

The support is switched off per default, but you can enable multi-touch
support via a new flag for GraphicsWindowCocoa::WindowData or directly
via the GraphicsWindowCocoa-class.

After switching multi-touch-support on, all mouse-events from the
trackpad get ignored, otherwise you'll have multiple events for the same
pointer which is very confusing (as the trackpad reports absolute
movement, and as a mouse relative movement).

I think this is not a problem, as multi-touch-input is a completely
different beast as a mouse, so you'll have to code your own
event-handlers anyway.

While coding this stuff, I asked myself if we should refactor
GUIEventAdapter/EventQueue and assign a specific event-type for
touch-input instead of using PUSH/DRAG/RELEASE. This will make it
clearer how to use the code, but will break the mouse-emulation for the
first touch-point and with that all existing manipulators. What do you
think? I am happy to code the proposed changes.

Additionally I created a small (and ugly) example osgmultitouch which
makes use of the osgGA::MultiTouchTrackballManipulator, shows all
touch-points on a HUD and demonstrates how to get the touchpoints from
an osgGA::GUIEventAdapter.

There's even a small example video here: http://vimeo.com/31611842"
This commit is contained in:
Robert Osfield
2012-02-03 14:25:08 +00:00
parent e5a16de7d4
commit 85bce8b8ad
6 changed files with 346 additions and 16 deletions
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32
src/osgGA/EventQueue.cpp
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@@ -24,6 +24,8 @@ EventQueue::EventQueue(GUIEventAdapter::MouseYOrientation mouseYOrientation)
_accumulateEventState = new GUIEventAdapter();
_accumulateEventState->setMouseYOrientation(mouseYOrientation);
_firstTouchEmulatesMouse = true;
}
EventQueue::~EventQueue()
@@ -403,11 +405,14 @@ void EventQueue::keyRelease(int key, double time, int unmodifiedKey)
GUIEventAdapter* EventQueue::touchBegan(unsigned int id, GUIEventAdapter::TouchPhase phase, float x, float y, double time)
{
// emulate left mouse button press
_accumulateEventState->setButtonMask((1) | _accumulateEventState->getButtonMask());
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
if(_firstTouchEmulatesMouse)
{
// emulate left mouse button press
_accumulateEventState->setButtonMask((1) | _accumulateEventState->getButtonMask());
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
}
GUIEventAdapter* event = new GUIEventAdapter(*_accumulateEventState);
event->setEventType(GUIEventAdapter::PUSH);
@@ -422,9 +427,11 @@ GUIEventAdapter* EventQueue::touchBegan(unsigned int id, GUIEventAdapter::Touch
GUIEventAdapter* EventQueue::touchMoved(unsigned int id, GUIEventAdapter::TouchPhase phase, float x, float y, double time)
{
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
if(_firstTouchEmulatesMouse)
{
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
}
GUIEventAdapter* event = new GUIEventAdapter(*_accumulateEventState);
event->setEventType(GUIEventAdapter::DRAG);
@@ -437,9 +444,12 @@ GUIEventAdapter* EventQueue::touchMoved(unsigned int id, GUIEventAdapter::Touch
GUIEventAdapter* EventQueue::touchEnded(unsigned int id, GUIEventAdapter::TouchPhase phase, float x, float y, unsigned int tap_count, double time)
{
_accumulateEventState->setButtonMask(~(1) & _accumulateEventState->getButtonMask());
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
if (_firstTouchEmulatesMouse)
{
_accumulateEventState->setButtonMask(~(1) & _accumulateEventState->getButtonMask());
_accumulateEventState->setX(x);
_accumulateEventState->setY(y);
}
GUIEventAdapter* event = new GUIEventAdapter(*_accumulateEventState);
event->setEventType(GUIEventAdapter::RELEASE);