Rotate non maximized windows

There are two types of rotation to be considered:
1. Rotation of native widgets
The corresponding window should be rotated and resized proportionally to the
new screen geometry.

2. Rotation of toplevel windows.
The window will be only rotated. It will be only moved or resized if it
becomes clipped, in order to be fitted on the screen properly.

Change-Id: Ice92427ac07a9bea284e68917ff3e0f436722bc0
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/plugins/platforms/qnx/qqnxscreen.cpp

@@ -251,6 +251,8 @@ void QQnxScreen::setRotation(int rotation)
         if (m_rootWindow)
             m_rootWindow->setRotation(rotation);
 
+        const QRect previousScreenGeometry = geometry();
+
         // Swap dimensions if we've rotated 90 or 270 from initial orientation
         if (isOrthogonal(m_initialRotation, rotation)) {
             m_currentGeometry = QRect(0, 0, m_initialGeometry.height(), m_initialGeometry.width());
@@ -265,6 +267,9 @@ void QQnxScreen::setRotation(int rotation)
             qScreenDebug() << Q_FUNC_INFO << "resize, size =" << m_currentGeometry.size();
             if (m_rootWindow)
                 m_rootWindow->resize(m_currentGeometry.size());
+
+            if (m_primaryScreen)
+                resizeWindows(previousScreenGeometry);
         } else {
             // TODO: Find one global place to flush display updates
             // Force immediate display update if no geometry changes required
@@ -281,7 +286,6 @@ void QQnxScreen::setRotation(int rotation)
         if (m_primaryScreen) {
             QWindowSystemInterface::handleScreenOrientationChange(screen(), orientation());
             QWindowSystemInterface::handleScreenGeometryChange(screen(), m_currentGeometry);
-            resizeMaximizedWindows();
         }
 
         // Flush everything, so that the windows rotations are applied properly.
@@ -290,6 +294,112 @@ void QQnxScreen::setRotation(int rotation)
     }
 }
 
+/*!
+  Resize the given window proportionally to the screen geometry
+*/
+void QQnxScreen::resizeNativeWidgetWindow(QQnxWindow *w, const QRect &previousScreenGeometry) const
+{
+    const qreal relativeX = static_cast<qreal>(w->geometry().topLeft().x()) / previousScreenGeometry.width();
+    const qreal relativeY = static_cast<qreal>(w->geometry().topLeft().y()) / previousScreenGeometry.height();
+    const qreal relativeWidth = static_cast<qreal>(w->geometry().width()) / previousScreenGeometry.width();
+    const qreal relativeHeight = static_cast<qreal>(w->geometry().height()) / previousScreenGeometry.height();
+
+    const QRect windowGeometry(relativeX * geometry().width(), relativeY * geometry().height(),
+            relativeWidth * geometry().width(), relativeHeight * geometry().height());
+
+    w->setGeometry(windowGeometry);
+}
+
+/*!
+  Resize the given window to fit the screen geometry
+*/
+void QQnxScreen::resizeTopLevelWindow(QQnxWindow *w, const QRect &previousScreenGeometry) const
+{
+    QRect windowGeometry = w->geometry();
+
+    const qreal relativeCenterX = static_cast<qreal>(w->geometry().center().x()) / previousScreenGeometry.width();
+    const qreal relativeCenterY = static_cast<qreal>(w->geometry().center().y()) / previousScreenGeometry.height();
+    const QPoint newCenter(relativeCenterX * geometry().width(), relativeCenterY * geometry().height());
+
+    windowGeometry.moveCenter(newCenter);
+
+    // adjust center position in case the window
+    // is clipped
+    if (!geometry().contains(windowGeometry)) {
+        const int x1 = windowGeometry.x();
+        const int y1 = windowGeometry.y();
+        const int x2 = x1 + windowGeometry.width();
+        const int y2 = y1 + windowGeometry.height();
+
+        if (x1 < 0) {
+            const int centerX = qMin(qAbs(x1) + windowGeometry.center().x(),
+                                        geometry().center().x());
+
+            windowGeometry.moveCenter(QPoint(centerX, windowGeometry.center().y()));
+        }
+
+        if (y1 < 0) {
+            const int centerY = qMin(qAbs(y1) + windowGeometry.center().y(),
+                                        geometry().center().y());
+
+            windowGeometry.moveCenter(QPoint(windowGeometry.center().x(), centerY));
+        }
+
+        if (x2 > geometry().width()) {
+            const int centerX = qMax(windowGeometry.center().x() - (x2 - geometry().width()),
+                                        geometry().center().x());
+
+            windowGeometry.moveCenter(QPoint(centerX, windowGeometry.center().y()));
+        }
+
+        if (y2 > geometry().height()) {
+            const int centerY = qMax(windowGeometry.center().y() - (y2 - geometry().height()),
+                                        geometry().center().y());
+
+            windowGeometry.moveCenter(QPoint(windowGeometry.center().x(), centerY));
+        }
+    }
+
+    // at this point, if the window is still clipped,
+    // it means that it's too big to fit on the screen,
+    // so we need to proportionally shrink it
+    if (!geometry().contains(windowGeometry)) {
+        QSize newSize = windowGeometry.size();
+        newSize.scale(geometry().size(), Qt::KeepAspectRatio);
+        windowGeometry.setSize(newSize);
+
+        if (windowGeometry.x() < 0)
+            windowGeometry.moveCenter(QPoint(geometry().center().x(), windowGeometry.center().y()));
+
+        if (windowGeometry.y() < 0)
+            windowGeometry.moveCenter(QPoint(windowGeometry.center().x(), geometry().center().y()));
+    }
+
+    w->setGeometry(windowGeometry);
+}
+
+/*!
+  Adjust windows to the new screen geometry.
+*/
+void QQnxScreen::resizeWindows(const QRect &previousScreenGeometry)
+{
+    resizeMaximizedWindows();
+
+    Q_FOREACH (QQnxWindow *w, m_childWindows) {
+
+        if (w->window()->windowState() & Qt::WindowFullScreen || w->window()->windowState() & Qt::WindowMaximized)
+            continue;
+
+        if (w->parent()) {
+            // This is a native (non-alien) widget window
+            resizeNativeWidgetWindow(w, previousScreenGeometry);
+        } else {
+            // This is a toplevel window
+            resizeTopLevelWindow(w, previousScreenGeometry);
+        }
+    }
+}
+
 QQnxWindow *QQnxScreen::findWindow(screen_window_t windowHandle)
 {
     Q_FOREACH (QQnxWindow *window, m_childWindows) {

src/plugins/platforms/qnx/qqnxscreen.h

@@ -106,6 +106,9 @@ private Q_SLOTS:
     void keyboardHeightChanged(int height);
 
 private:
+    void resizeNativeWidgetWindow(QQnxWindow *w, const QRect &previousScreenGeometry) const;
+    void resizeTopLevelWindow(QQnxWindow *w, const QRect &previousScreenGeometry) const;
+    void resizeWindows(const QRect &previousScreenGeometry);
     void addOverlayWindow(screen_window_t window);
     void removeOverlayWindow(screen_window_t window);