From Jeremy Moles, import of the osgWidget NodeKit, sourced from the original http://osgwidget.googlecode.com/svn/trunk

Notes from Robert Osfield, I've merged osgWidget trunk, and added/changed CMakeLists.txt file to make it suitable for inclusion in the core OSG, and moved imagery/scripts/shaders out into OpenSceneGraph-Data

src/osgWidget/ViewerEventHandlers.cpp

@@ -0,0 +1,190 @@
+// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
+// $Id: ViewerEventHandlers.cpp 59 2008-05-15 20:55:31Z cubicool $
+
+#include <osgWidget/ViewerEventHandlers>
+
+namespace osgWidget {
+
+MouseHandler::MouseHandler(WindowManager* wm):
+_wm(wm) {
+}
+
+bool MouseHandler::handle(
+	const osgGA::GUIEventAdapter& gea,
+	osgGA::GUIActionAdapter&      gaa,
+	osg::Object*                  obj,
+	osg::NodeVisitor*             nv
+) {
+	osgGA::GUIEventAdapter::EventType ev = gea.getEventType();
+	MouseAction                       ma = _isMouseEvent(ev);
+
+	if(ma) {
+		// If we're scrolling, we need to inform the WindowManager of that.
+		_wm->setScrollingMotion(gea.getScrollingMotion());
+
+		return (this->*ma)(gea.getX(), gea.getY(), gea.getButton());
+	}
+	
+	return false;
+}
+
+bool MouseHandler::_handleMousePush(float x, float y, int button) {
+	if(button == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mousePushedLeft
+	);
+
+	else if(button == osgGA::GUIEventAdapter::RIGHT_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mousePushedRight
+	);
+
+	else if(button == osgGA::GUIEventAdapter::MIDDLE_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mousePushedMiddle
+	);
+
+	else return false;
+}
+
+bool MouseHandler::_handleMouseRelease(float x, float y, int button) {
+	if(button == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mouseReleasedLeft
+	);
+
+	else if(button == osgGA::GUIEventAdapter::RIGHT_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mouseReleasedRight
+	);
+
+	else if(button == osgGA::GUIEventAdapter::MIDDLE_MOUSE_BUTTON) return _doMouseEvent(
+		x,
+		y,
+		&WindowManager::mouseReleasedMiddle
+	);
+
+	else return false;
+}
+
+bool MouseHandler::_handleMouseDoubleClick(float x, float y, int button) {
+	return false;
+}
+
+bool MouseHandler::_handleMouseDrag(float x, float y, int button) {
+	return _doMouseEvent(x, y, &WindowManager::pointerDrag);
+}
+
+bool MouseHandler::_handleMouseMove(float x, float y, int button) {
+	return _doMouseEvent(x, y, &WindowManager::pointerMove);
+}
+
+bool MouseHandler::_handleMouseScroll(float x, float y, int) {
+	return _doMouseEvent(x, y, &WindowManager::mouseScroll);
+}
+
+MouseHandler::MouseAction MouseHandler::_isMouseEvent(
+	osgGA::GUIEventAdapter::EventType ev
+) const {
+	if(ev == osgGA::GUIEventAdapter::PUSH) return
+		&MouseHandler::_handleMousePush
+	;
+		
+	else if(ev == osgGA::GUIEventAdapter::RELEASE) return
+		&MouseHandler::_handleMouseRelease
+	;
+	
+	else if(ev == osgGA::GUIEventAdapter::DOUBLECLICK) return
+		&MouseHandler::_handleMouseDoubleClick
+	;
+	
+	else if(ev == osgGA::GUIEventAdapter::DRAG) return
+		&MouseHandler::_handleMouseDrag
+	;
+	
+	else if(ev == osgGA::GUIEventAdapter::MOVE) return
+		&MouseHandler::_handleMouseMove
+	;
+	
+	else if(ev == osgGA::GUIEventAdapter::SCROLL) return
+		&MouseHandler::_handleMouseScroll
+	;
+
+	else return 0;
+}
+
+bool MouseHandler::_doMouseEvent(float x, float y, MouseEvent me) {
+	bool handled = (_wm.get()->*me)(x, y);
+
+	// This is called LAST for things like drag, which needs to calculate a mouse difference.
+	_wm->setPointerXY(x, y);
+
+	return handled;
+}
+
+KeyboardHandler::KeyboardHandler(WindowManager* wm):
+_wm(wm) {
+}
+
+bool KeyboardHandler::handle(
+	const osgGA::GUIEventAdapter& gea,
+	osgGA::GUIActionAdapter&      gaa,
+	osg::Object*                  obj,
+	osg::NodeVisitor*             nv
+) {
+	osgGA::GUIEventAdapter::EventType ev = gea.getEventType();
+
+	if(
+		ev != osgGA::GUIEventAdapter::KEYDOWN &&
+		ev != osgGA::GUIEventAdapter::KEYUP
+	) return false;
+
+	int key     = gea.getKey();
+	int keyMask = gea.getModKeyMask();
+
+	// -1 is the "key invalid" return code.
+	if(key == -1) return false;
+
+	if(ev == osgGA::GUIEventAdapter::KEYDOWN) return _wm->keyDown(key, keyMask);
+
+	else if(ev == osgGA::GUIEventAdapter::KEYUP) return _wm->keyUp(key, keyMask);
+
+	return false;
+}
+
+ResizeHandler::ResizeHandler(WindowManager* wm, osg::Camera* camera):
+_wm     (wm),
+_camera (camera) {
+}
+
+bool ResizeHandler::handle(
+	const osgGA::GUIEventAdapter& gea,
+	osgGA::GUIActionAdapter&      gaa,
+	osg::Object*                  obj,
+	osg::NodeVisitor*             nv
+) {
+	osgGA::GUIEventAdapter::EventType ev = gea.getEventType();
+
+	if(ev != osgGA::GUIEventAdapter::RESIZE) return false;
+
+	osg::Matrix::value_type w = gea.getWindowWidth();
+	osg::Matrix::value_type h = gea.getWindowHeight();
+
+	if(_wm->isInvertedY()) _camera->setProjectionMatrix(
+		createInvertedYOrthoProjectionMatrix(w, h)
+	);
+
+	else _camera->setProjectionMatrix(osg::Matrix::ortho2D(0.0f, w, 0.0f, h));
+	
+	_wm->setSize(w, h);
+	_wm->resizeAllWindows();
+
+	return true;
+}
+
+}