QCursor: Associate cursor with screen.

- Introduce cursor() accessor to QPlatformScreen.
- Remove screen member of QPlatformCursor (a
  cursor can be shared by multiple screens
  of a virtual desktop).
- Add QCursor::pos()/ QCursor::setPos() taking
  a QScreen-parameter, use primaryScreen() for
  old overloads.  QCursor::pos() can then query
  the platform cursor for the position and return
  the position even if the mouse position is outside
  the windows owned by the Qt application.
- Fix tests

Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

Task-number: QTBUG-22457
Task-number: QTBUG-22565
Task-number: QTBUG-20753
Change-Id: Ia69f37343f95772e934eab1cd806bd54cbdbbe51
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowsscreen.cpp b/src/plugins/platforms/windows/qwindowsscreen.cpp
index 1dc5175515..2476e15169 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.cpp
+++ b/src/plugins/platforms/windows/qwindowsscreen.cpp
@@ -147,6 +147,14 @@ static QDebug operator<<(QDebug dbg, const QWindowsScreenData &d)
     return dbg;
 }
 
+// Return the cursor to be shared by all screens (virtual desktop).
+static inline QSharedPointer<QWindowsCursor> sharedCursor()
+{
+    if (const QScreen *primaryScreen = QGuiApplication::primaryScreen())
+        return static_cast<const QWindowsScreen *>(primaryScreen->handle())->windowsCursor();
+    return QSharedPointer<QWindowsCursor>(new QWindowsCursor);
+}
+
 /*!
     \class QWindowsScreen
     \brief Windows screen.
@@ -155,7 +163,7 @@ static QDebug operator<<(QDebug dbg, const QWindowsScreenData &d)
 */
 
 QWindowsScreen::QWindowsScreen(const QWindowsScreenData &data) :
-    m_data(data), m_cursor(this)
+    m_data(data), m_cursor(sharedCursor())
 {
 }