Introducing QWidget::createWindowContainer()

A QWidget that can embed a QWindow. This can be used
to embed a QWindow/QOpenGLContext based window or a
full QQuickView.

Change-Id: I8415b5ae38562fc00b46150fa70b56fd9b19a80c
Reviewed-by: Jørgen Lind <jorgen.lind@gmail.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

3 files changed, 181 insertions, 1 deletions

diff --git a/examples/widgets/widgets.pro b/examples/widgets/widgets.pro
index 87054cff0d..28519b25cc 100644
--- a/examples/widgets/widgets.pro
+++ b/examples/widgets/widgets.pro
@@ -17,7 +17,8 @@ SUBDIRS       = \
                 statemachine \
                 tools \
                 tutorials \
-                widgets
+                widgets \
+                windowcontainer
 
 contains(DEFINES, QT_NO_CURSOR): SUBDIRS -= mainwindows
 contains(DEFINES, QT_NO_DRAGANDDROP): SUBDIRS -= draganddrop
diff --git a/examples/widgets/windowcontainer/windowcontainer.cpp b/examples/widgets/windowcontainer/windowcontainer.cpp
new file mode 100644
index 0000000000..42523a53d0
--- /dev/null
+++ b/examples/widgets/windowcontainer/windowcontainer.cpp
@@ -0,0 +1,170 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "openglwindow.h"
+
+#include <QPainter>
+#include <QMouseEvent>
+#include <QKeyEvent>
+#include <QFocusEvent>
+
+#include <QApplication>
+#include <QWidget>
+#include <QHBoxLayout>
+#include <QLineEdit>
+
+
+
+// Making use of the class from the opengl example in gui.
+class Window : public OpenGLWindow
+{
+    Q_OBJECT
+public:
+    Window()
+        : m_mouseDown(false)
+        , m_focus(false)
+    {
+    }
+
+    void render(QPainter *p) {
+        QLinearGradient g(0, 0, 0, height());
+        g.setColorAt(0, QColor("lightsteelblue"));
+        g.setColorAt(1, Qt::black);
+        p->fillRect(0, 0, width(), height(), g);
+
+        p->setPen(Qt::white);
+
+        p->drawText(20, 30, QLatin1String("This is an OpenGL based QWindow"));
+
+        if (m_key.trimmed().length() > 0) {
+            QRect bounds = p->boundingRect(QRect(0, 0, width(), height()), Qt::AlignTop | Qt::AlignLeft, m_key);
+            p->save();
+            p->translate(width() / 2.0, height() / 2.0);
+            p->scale(10, 10);
+            p->translate(-bounds.width() / 2.0, -bounds.height() / 2.0);
+            p->drawText(bounds, Qt::AlignCenter, m_key);
+            p->restore();
+        }
+
+        if (m_focus) {
+            p->drawText(20, height() - 20, QLatin1String("Window has focus!"));
+        }
+
+        p->setRenderHint(QPainter::Antialiasing);
+        p->drawPolyline(m_polygon);
+    }
+
+    void mousePressEvent(QMouseEvent *e) {
+        m_mouseDown = true;
+        m_polygon.clear();
+        m_polygon.append(e->pos());
+        renderLater();
+    }
+
+    void mouseMoveEvent(QMouseEvent *e) {
+        if (m_mouseDown) {
+            m_polygon.append(e->pos());
+            renderLater();
+        }
+    }
+
+    void mouseReleaseEvent(QMouseEvent *e) {
+        m_mouseDown = false;
+        m_polygon.append(e->pos());
+        renderLater();
+    }
+
+    void focusInEvent(QFocusEvent *) {
+        m_focus = true;
+        renderLater();
+    }
+
+    void focusOutEvent(QFocusEvent *) {
+        m_focus = false;
+        m_polygon.clear();
+        renderLater();
+    }
+
+    void keyPressEvent(QKeyEvent *e) {
+        m_key = e->text();
+        renderLater();
+    }
+
+    void keyReleaseEvent(QKeyEvent *) {
+        m_key = QString();
+        renderLater();
+    }
+private:
+    QPolygon m_polygon;
+    bool m_mouseDown;
+
+    bool m_focus;
+
+    QString m_key;
+};
+
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QWidget *widget = new QWidget;
+    QHBoxLayout *layout = new QHBoxLayout(widget);
+
+    Window *window = new Window();
+
+    QWidget *container = QWidget::createWindowContainer(window);
+    container->setMinimumSize(300, 300);
+    container->setMaximumSize(600, 600);
+    container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    container->setFocusPolicy(Qt::StrongFocus);
+
+    window->setGeometry(100, 100, 300, 200);
+
+    layout->addWidget(new QLineEdit(QLatin1String("A QLineEdit")));
+    layout->addWidget(container);
+    layout->addWidget(new QLineEdit(QLatin1String("A QLabel")));
+
+    widget->show();
+
+    return app.exec();
+}
+
+#include "windowcontainer.moc"
diff --git a/examples/widgets/windowcontainer/windowcontainer.pro b/examples/widgets/windowcontainer/windowcontainer.pro
new file mode 100644
index 0000000000..9ac7e4a5ab
--- /dev/null
+++ b/examples/widgets/windowcontainer/windowcontainer.pro
@@ -0,0 +1,9 @@
+SOURCES     = windowcontainer.cpp
+
+QT += widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/windowcontainer
+INSTALLS += target
+
+include(../../gui/openglwindow/openglwindow.pri)