1 files changed, 158 insertions, 0 deletions
diff --git a/examples/qpa/windows/window.cpp b/examples/qpa/windows/window.cpp
new file mode 100644
index 0000000000..fecc22034a
--- /dev/null
+++ b/examples/qpa/windows/window.cpp
@@ -0,0 +1,158 @@
+#include "window.h"
+
+#include <private/qguiapplication_p.h>
+
+#include <QBackingStore>
+#include <QPainter>
+
+static int colorIndexId = 0;
+
+QColor colorTable[] =
+{
+    QColor("#f09f8f"),
+    QColor("#a2bff2"),
+    QColor("#c0ef8f")
+};
+
+Window::Window(QScreen *screen)
+    : QWindow(screen)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+Window::Window(QWindow *parent)
+    : QWindow(parent)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+void Window::initialize()
+{
+    if (parent())
+        setGeometry(QRect(160, 120, 320, 240));
+    else {
+        setGeometry(QRect(10, 10, 640, 480));
+
+        setSizeIncrement(QSize(10, 10));
+        setBaseSize(QSize(640, 480));
+        setMinimumSize(QSize(240, 160));
+        setMaximumSize(QSize(800, 600));
+    }
+
+    create();
+    m_backingStore = new QBackingStore(this);
+
+    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);
+    m_renderTimer = 0;
+}
+
+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();
+    }
+
+    scheduleRender();
+}
+
+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);
+    }
+
+    scheduleRender();
+}
+
+void Window::exposeEvent(QExposeEvent *)
+{
+    scheduleRender();
+}
+
+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;
+    }
+    scheduleRender();
+}
+
+void Window::scheduleRender()
+{
+    if (!m_renderTimer)
+        m_renderTimer = startTimer(1);
+}
+
+void Window::timerEvent(QTimerEvent *)
+{
+    render();
+    killTimer(m_renderTimer);
+    m_renderTimer = 0;
+}
+
+void Window::render()
+{
+    QRect rect(QPoint(), geometry().size());
+    m_backingStore->resize(rect.size());
+
+    m_backingStore->beginPaint(rect);
+
+    QPaintDevice *device = m_backingStore->paintDevice();
+
+    QPainter p(device);
+    p.drawImage(0, 0, m_image);
+
+    QFont font;
+    font.setPixelSize(32);
+
+    p.setFont(font);
+    p.drawText(rect, 0, m_text);
+
+    m_backingStore->endPaint();
+    m_backingStore->flush(rect);
+}
+
+