Pure QWindow with multiple windows and child windows example added.

examples/examples.pro

@@ -48,6 +48,7 @@ symbian: SUBDIRS = \
     SUBDIRS += multimedia
 }
 
+qpa:SUBDIRS += qpa
 embedded:SUBDIRS += qws
 contains(QT_BUILD_PARTS, tools):!contains(QT_CONFIG, no-gui):SUBDIRS += qtestlib
 contains(QT_CONFIG, opengl): SUBDIRS += opengl

examples/qpa/qpa.pro

@@ -0,0 +1,8 @@
+TEMPLATE      = subdirs
+SUBDIRS       = windows
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/qtbase/qpa
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS qpa.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/qtbase/qpa
+INSTALLS += target sources

examples/qpa/windows/main.cpp

@@ -0,0 +1,19 @@
+#include <QGuiApplication>
+
+#include "window.h"
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    Window a;
+    a.setVisible(true);
+
+    Window b;
+    b.setVisible(true);
+
+    Window child(&b);
+    child.setVisible(true);
+
+    return app.exec();
+}

examples/qpa/windows/window.cpp

@@ -0,0 +1,131 @@
+#include "window.h"
+
+#include <private/qguiapplication_qpa_p.h>
+#include <private/qwindowsurface_p.h>
+
+#include <QPainter>
+
+static int colorIndexId = 0;
+
+QColor colorTable[] =
+{
+    QColor("#f09f8f"),
+    QColor("#a2bff2"),
+    QColor("#c0ef8f")
+};
+
+Window::Window(QWindow *parent)
+    : QWindow(0)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    setSurfaceType(RasterSurface);
+    setWindowTitle(QLatin1String("Window"));
+
+    if (parent)
+        setGeometry(QRect(10, 10, 40, 40));
+    else
+        setGeometry(QRect(10, 10, 640, 480));
+
+    if (parent) {
+        setParent(parent);
+        setGeometry(QRect(160, 120, 320, 240));
+    }
+
+    create();
+    QGuiApplicationPrivate::platformIntegration()->createWindowSurface(this, winId());
+
+    m_image = QImage(geometry().size(), QImage::Format_RGB32);
+    m_image.fill(colorTable[m_backgroundColorIndex % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+    m_lastPos = QPoint(-1, -1);
+
+    render();
+}
+
+void Window::mousePressEvent(QMouseEvent *event)
+{
+    m_lastPos = event->pos();
+}
+
+void Window::mouseMoveEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = event->pos();
+    }
+
+    render();
+}
+
+void Window::mouseReleaseEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = QPoint(-1, -1);
+    }
+
+    render();
+}
+
+void Window::resizeEvent(QResizeEvent *)
+{
+    QImage old = m_image;
+
+    int width = qMax(geometry().width(), old.width());
+    int height = qMax(geometry().height(), old.height());
+
+    if (width > old.width() || height > old.height()) {
+        m_image = QImage(width, height, QImage::Format_RGB32);
+        m_image.fill(colorTable[(m_backgroundColorIndex) % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+        QPainter p(&m_image);
+        p.drawImage(0, 0, old);
+    }
+
+    render();
+}
+
+void Window::keyPressEvent(QKeyEvent *event)
+{
+    switch (event->key()) {
+    case Qt::Key_Backspace:
+        m_text.chop(1);
+        break;
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+        m_text.append('\n');
+        break;
+    default:
+        m_text.append(event->text());
+        break;
+    }
+    render();
+}
+
+void Window::render()
+{
+    QRect rect(QPoint(), geometry().size());
+    surface()->resize(rect.size());
+
+    surface()->beginPaint(rect);
+
+    QPaintDevice *device = surface()->paintDevice();
+
+    QPainter p(device);
+    p.drawImage(0, 0, m_image);
+
+    QFont font;
+    font.setPixelSize(32);
+
+    p.setFont(font);
+    p.drawText(rect, 0, m_text);
+
+    surface()->endPaint(rect);
+    surface()->flush(this, rect, QPoint());
+}
+
+

examples/qpa/windows/window.h

@@ -0,0 +1,25 @@
+#include <QWindow>
+#include <QImage>
+
+class Window : public QWindow
+{
+public:
+    Window(QWindow *parent = 0);
+
+protected:
+    void mousePressEvent(QMouseEvent *);
+    void mouseMoveEvent(QMouseEvent *);
+    void mouseReleaseEvent(QMouseEvent *);
+
+    void keyPressEvent(QKeyEvent *);
+
+    void resizeEvent(QResizeEvent *);
+
+private:
+    void render();
+
+    QString m_text;
+    QImage m_image;
+    QPoint m_lastPos;
+    int m_backgroundColorIndex;
+};

examples/qpa/windows/windows.pro

@@ -0,0 +1,12 @@
+######################################################################
+# Automatically generated by qmake (2.01a) Wed Apr 27 16:40:46 2011
+######################################################################
+
+TEMPLATE = app
+TARGET = 
+DEPENDPATH += .
+INCLUDEPATH += .
+
+# Input
+HEADERS += window.h
+SOURCES += window.cpp main.cpp