Added workable QScreen API on top of QPlatformScreen.

QPlatformIntegration::screens() no longer has to be implemented,
implementations should call QPlatformIntegration::screenAdded() for each
screen instead. This is for being able to support adding screens at
run-time later on, by connecting it to a signal in QGuiApplication.

The QGuiGLContext API has changed a bit, by not sending in all the
parameters in the constructor but instead having a create() function.
The createPlatformGLContext() factory in QPlatformIntegration takes a
QGuiGLContext * instead of a QSurfaceFormat and a share context, similar
to how the window and backing store factory functions work.

The XCB plugin has experimental support for connecting to multiple X
displays simultaneously, creating one or more QScreen for each.

Change-Id: I248a22a4fd3481280710110272c04a30a8021e8f
Reviewed-on: http://codereview.qt.nokia.com/2103
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

3 files changed, 47 insertions, 5 deletions

diff --git a/examples/qpa/windows/main.cpp b/examples/qpa/windows/main.cpp
index 99c24fa017..e4cd14398c 100644
--- a/examples/qpa/windows/main.cpp
+++ b/examples/qpa/windows/main.cpp
@@ -1,4 +1,5 @@
 #include <QGuiApplication>
+#include <QScreen>
 
 #include "window.h"
 
@@ -15,5 +16,16 @@ int main(int argc, char **argv)
     Window child(&b);
     child.setVisible(true);
 
+    // create one window on each additional screen as well
+
+    QList<QScreen *> screens = app.screens();
+    foreach (QScreen *screen, screens) {
+        if (screen == app.primaryScreen())
+            continue;
+        Window *window = new Window(screen);
+        window->setVisible(true);
+        window->setWindowTitle(screen->name());
+    }
+
     return app.exec();
 }
diff --git a/examples/qpa/windows/window.cpp b/examples/qpa/windows/window.cpp
index bbfc6a3116..fecc22034a 100644
--- a/examples/qpa/windows/window.cpp
+++ b/examples/qpa/windows/window.cpp
@@ -14,13 +14,23 @@ QColor colorTable[] =
     QColor("#c0ef8f")
 };
 
+Window::Window(QScreen *screen)
+    : QWindow(screen)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
 Window::Window(QWindow *parent)
     : QWindow(parent)
     , m_backgroundColorIndex(colorIndexId++)
 {
-    setWindowTitle(QLatin1String("Window"));
+    initialize();
+}
 
-    if (parent)
+void Window::initialize()
+{
+    if (parent())
         setGeometry(QRect(160, 120, 320, 240));
     else {
         setGeometry(QRect(10, 10, 640, 480));
@@ -38,6 +48,7 @@ Window::Window(QWindow *parent)
     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)
@@ -54,7 +65,7 @@ void Window::mouseMoveEvent(QMouseEvent *event)
         m_lastPos = event->pos();
     }
 
-    render();
+    scheduleRender();
 }
 
 void Window::mouseReleaseEvent(QMouseEvent *event)
@@ -66,12 +77,12 @@ void Window::mouseReleaseEvent(QMouseEvent *event)
         m_lastPos = QPoint(-1, -1);
     }
 
-    render();
+    scheduleRender();
 }
 
 void Window::exposeEvent(QExposeEvent *)
 {
-    render();
+    scheduleRender();
 }
 
 void Window::resizeEvent(QResizeEvent *)
@@ -106,7 +117,20 @@ void Window::keyPressEvent(QKeyEvent *event)
         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()
diff --git a/examples/qpa/windows/window.h b/examples/qpa/windows/window.h
index 546cf67bce..bf664d148e 100644
--- a/examples/qpa/windows/window.h
+++ b/examples/qpa/windows/window.h
@@ -5,6 +5,7 @@ class Window : public QWindow
 {
 public:
     Window(QWindow *parent = 0);
+    Window(QScreen *screen);
 
 protected:
     void mousePressEvent(QMouseEvent *);
@@ -16,12 +17,17 @@ protected:
     void exposeEvent(QExposeEvent *);
     void resizeEvent(QResizeEvent *);
 
+    void timerEvent(QTimerEvent *);
+
 private:
     void render();
+    void scheduleRender();
+    void initialize();
 
     QString m_text;
     QImage m_image;
     QPoint m_lastPos;
     int m_backgroundColorIndex;
     QBackingStore *m_backingStore;
+    int m_renderTimer;
 };