From 6da42d9cd6c8e282f7868545063675a02b05c6a2 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 10 Mar 2010 13:24:53 +0000
Subject: [PATCH] From Wang Rui, QWidgetImage class that enables QWidgets to be
 used as an interactive osg::Image that can be assigned to textures.

---
 include/osgQt/QWidgetImage         | 52 ++++++++++++++++++++++++
 src/osgQt/CMakeLists.txt           |  2 +
 src/osgQt/QGraphicsViewAdapter.cpp |  4 ++
 src/osgQt/QWidgetImage.cpp         | 65 ++++++++++++++++++++++++++++++
 4 files changed, 123 insertions(+)
 create mode 100644 include/osgQt/QWidgetImage
 create mode 100644 src/osgQt/QWidgetImage.cpp

diff --git a/include/osgQt/QWidgetImage b/include/osgQt/QWidgetImage
new file mode 100644
index 000000000..79ba0867a
--- /dev/null
+++ b/include/osgQt/QWidgetImage
@@ -0,0 +1,52 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef QWIDGETIMAGE
+#define QWIDGETIMAGE
+
+#include <osg/Image>
+#include <osgQt/QGraphicsViewAdapter>
+
+namespace osgQt
+{
+
+class OSGQT_EXPORT QWidgetImage : public osg::Image
+{
+    public:
+
+        QWidgetImage( QWidget* widget=0 );
+
+        QWidget* getQWidget() { return _widget; }
+        QGraphicsViewAdapter* getQGraphicsViewAdapter() { return _adapter; }
+
+        void focusWidget(bool focus);
+
+        void clearWriteBuffer();
+
+        void render();
+
+        virtual void setFrameLastRendered(const osg::FrameStamp* frameStamp);
+
+        virtual bool sendPointerEvent(int x, int y, int buttonMask);
+
+        virtual bool sendKeyEvent(int key, bool keyDown);
+
+    protected:
+
+        QPointer<QGraphicsViewAdapter>  _adapter;
+        QPointer<QWidget>               _widget;
+};
+
+}
+
+#endif
\ No newline at end of file
diff --git a/src/osgQt/CMakeLists.txt b/src/osgQt/CMakeLists.txt
index 649d4a9c5..a9fd068e4 100644
--- a/src/osgQt/CMakeLists.txt
+++ b/src/osgQt/CMakeLists.txt
@@ -20,6 +20,7 @@ SET(LIB_PUBLIC_HEADERS
     ${HEADER_PATH}/QFontImplementation
     ${HEADER_PATH}/QGraphicsViewAdapter
     ${HEADER_PATH}/QWebViewImage
+    ${HEADER_PATH}/QWidgetImage
 )
 
 # FIXME: For OS X, need flag for Framework or dylib
@@ -29,6 +30,7 @@ ADD_LIBRARY(${LIB_NAME}
     QFontImplementation.cpp
     QGraphicsViewAdapter.cpp
     QWebViewImage.cpp
+    QWidgetImage.cpp
     ${SOURCES_H_MOC}
     ${OPENSCENEGRAPH_VERSIONINFO_RC}
 )
diff --git a/src/osgQt/QGraphicsViewAdapter.cpp b/src/osgQt/QGraphicsViewAdapter.cpp
index 3ecc5158d..e152137fb 100644
--- a/src/osgQt/QGraphicsViewAdapter.cpp
+++ b/src/osgQt/QGraphicsViewAdapter.cpp
@@ -12,6 +12,7 @@
 */
 
 #include <osgQt/QGraphicsViewAdapter>
+#include <osgQt/QWidgetImage>
 #include <osgQt/QWebViewImage>
 
 #include <QtOpenGL/QGLWidget>
@@ -309,6 +310,9 @@ bool QGraphicsViewAdapter::handlePointerEvent(int x, int y, int buttonMask)
 
         if (eventType==QEvent::MouseButtonPress)
         {
+            QWidgetImage* qwidgetImage = dynamic_cast<QWidgetImage*>(_image.get());
+            if (qwidgetImage) qwidgetImage->focusWidget(true);
+            
             QWebViewImage* qwebViewImage = dynamic_cast<QWebViewImage*>(_image.get());
             if (qwebViewImage) qwebViewImage->focusBrowser(true);
         }
diff --git a/src/osgQt/QWidgetImage.cpp b/src/osgQt/QWidgetImage.cpp
new file mode 100644
index 000000000..95743da97
--- /dev/null
+++ b/src/osgQt/QWidgetImage.cpp
@@ -0,0 +1,65 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgQt/QWidgetImage>
+#include <QtGui/QLayout>
+
+namespace osgQt
+{
+
+QWidgetImage::QWidgetImage( QWidget* widget )
+{
+    // make sure we have a valid QApplication before we start creating widgets.
+    getOrCreateQApplication();
+
+    QVBoxLayout* layout = new QVBoxLayout;
+    if (widget) layout->addWidget(widget);
+
+    _widget = new QWidget;
+    _widget->setLayout(layout);
+    _widget->setGeometry(0, 0, 800, 600);  // FIXME: a different size leads to unexpected result
+    _adapter = new QGraphicsViewAdapter(this, _widget.data());
+}
+
+void QWidgetImage::focusWidget(bool focus)
+{
+    QFocusEvent event(focus ? QEvent::FocusIn : QEvent::FocusOut, Qt::OtherFocusReason);
+    QCoreApplication::sendEvent(_widget, &event);
+}
+
+void QWidgetImage::clearWriteBuffer()
+{
+    _adapter->clearWriteBuffer();
+}
+
+void QWidgetImage::render()
+{
+    _adapter->render();
+}
+
+void QWidgetImage::setFrameLastRendered(const osg::FrameStamp* frameStamp)
+{
+    _adapter->setFrameLastRendered(frameStamp);
+}
+
+bool QWidgetImage::sendPointerEvent(int x, int y, int buttonMask)
+{
+    return _adapter->sendPointerEvent(x,y,buttonMask);
+}
+
+bool QWidgetImage::sendKeyEvent(int key, bool keyDown)
+{
+    return _adapter->sendKeyEvent(key, keyDown);
+}
+
+}