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

examples/osgwidgetbox/osgwidgetbox.cpp

@@ -0,0 +1,122 @@
+// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
+// $Id: osgwidgetbox.cpp 59 2008-05-15 20:55:31Z cubicool $
+
+// NOTE: You'll find this example very similar to osgwidgetwindow. However, here we
+// demonstrate a bit of subclassing of Widget so that we can respond to events
+// such as mouseEnter and mouseLeave. We also demonstrate the use of padding, though
+// fill and alignment should be working too.
+
+#include <osg/io_utils>
+#include <osgDB/ReadFile>
+#include <osgWidget/Util>
+#include <osgWidget/WindowManager>
+#include <osgWidget/Box>
+
+const unsigned int MASK_2D = 0xF0000000;
+const unsigned int MASK_3D = 0x0F000000;
+
+struct ColorWidget: public osgWidget::Widget {
+	ColorWidget():
+	osgWidget::Widget("", 256.0f, 256.0f) {
+	}
+
+	bool mouseEnter(double, double, osgWidget::WindowManager*) {
+		addColor(-osgWidget::Color(0.4f, 0.4f, 0.4f, 0.0f));
+		
+		// osgWidget::warn() << "enter: " << getColor() << std::endl;
+
+		return true;
+	}
+
+	bool mouseLeave(double, double, osgWidget::WindowManager*) {
+		addColor(osgWidget::Color(0.4f, 0.4f, 0.4f, 0.0f));
+		
+		// osgWidget::warn() << "leave: " << getColor() << std::endl;
+		
+		return true;
+	}
+
+	bool mouseOver(double x, double y, osgWidget::WindowManager*) {
+		osgWidget::Color c = getImageColorAtPointerXY(x, y);
+
+		if(c.a() < 0.001f) {
+			// osgWidget::warn() << "Transparent Pixel: " << x << " " << y << std::endl;
+
+			return false;
+		}
+
+		return true;
+	}
+
+	bool keyUp(int key, int keyMask, osgWidget::WindowManager*) {
+		// osgWidget::warn() << "..." << key << " - " << keyMask << std::endl;
+
+		return true;
+	}
+};
+
+osgWidget::Box* createBox(const std::string& name, osgWidget::Box::BOX_TYPE bt) {
+	osgWidget::Box*    box     = new osgWidget::Box(name, bt, true);
+	osgWidget::Widget* widget1 = new osgWidget::Widget(name + "_widget1", 100.0f, 100.0f);
+	osgWidget::Widget* widget2 = new osgWidget::Widget(name + "_widget2", 100.0f, 100.0f);
+	osgWidget::Widget* widget3 = new ColorWidget();
+
+	widget1->setColor(0.3f, 0.3f, 0.3f, 1.0f);
+	widget2->setColor(0.6f, 0.6f, 0.6f, 1.0f);
+
+	widget3->setImage("osgWidget/natascha.png");
+	widget3->setTexCoord(0.0f, 0.0f, osgWidget::Widget::LOWER_LEFT);
+	widget3->setTexCoord(1.0f, 0.0f, osgWidget::Widget::LOWER_RIGHT);
+	widget3->setTexCoord(1.0f, 1.0f, osgWidget::Widget::UPPER_RIGHT);
+	widget3->setTexCoord(0.0f, 1.0f, osgWidget::Widget::UPPER_LEFT);
+
+	box->addWidget(widget1);
+	box->addWidget(widget2);
+	box->addWidget(widget3);
+
+	return box;
+}
+
+int main(int argc, char** argv) {
+	osgViewer::CompositeViewer viewer;
+
+	osgViewer::View* view = new osgViewer::View();
+
+	osgWidget::WindowManager* wm = new osgWidget::WindowManager(
+		view,
+		1280.0f,
+		1024.0f,
+		MASK_2D,
+		osgWidget::WindowManager::WM_PICK_DEBUG |
+		osgWidget::WindowManager::WM_NO_INVERT_Y
+	);
+	
+	wm->setPointerFocusMode(osgWidget::WindowManager::PFM_SLOPPY);
+
+	osgWidget::Window* box1 = createBox("HBOX", osgWidget::Box::HORIZONTAL);
+	osgWidget::Window* box2 = createBox("VBOX", osgWidget::Box::VERTICAL);
+	osgWidget::Window* box3 = createBox("HBOX2", osgWidget::Box::HORIZONTAL);
+	osgWidget::Window* box4 = createBox("VBOX2", osgWidget::Box::VERTICAL);
+
+	box1->getBackground()->setColor(1.0f, 0.0f, 0.0f, 0.8f);
+	box1->attachMoveCallback();
+
+	box2->getBackground()->setColor(0.0f, 1.0f, 0.0f, 0.8f);
+	box2->attachMoveCallback();
+
+	box3->getBackground()->setColor(0.0f, 0.0f, 1.0f, 0.8f);
+	box3->attachMoveCallback();
+
+	wm->addChild(box1);
+	wm->addChild(box2);
+	wm->addChild(box3);
+	wm->addChild(box4);
+
+	box4->hide();
+
+	osg::Node* model = osgDB::readNodeFile("spaceship.osg");
+
+	model->setNodeMask(MASK_3D);
+
+	return osgWidget::createCompositeExample(viewer, view, wm, model);
+}