Introduce QPA API for size grip handling.

- Introduce API to do size grip handling (mouse press
  and move).
- Move Windows code to Windows plugin.
- Move X11 code to XCB plugin and activate it.

Change-Id: I2f61d6ddc1fa07447e668554d41ecc820efca23f
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformwindow.h b/src/gui/kernel/qplatformwindow.h
index 7cb8d8cdb8..604398909d 100644
--- a/src/gui/kernel/qplatformwindow.h
+++ b/src/gui/kernel/qplatformwindow.h
@@ -117,6 +117,8 @@ public:
 
     virtual void windowEvent(QEvent *event);
 
+    virtual bool startSystemResize(const QPoint &pos, Qt::Corner corner);
+
 protected:
     QScopedPointer<QPlatformWindowPrivate> d_ptr;
 private:
diff --git a/src/gui/kernel/qplatformwindow_qpa.cpp b/src/gui/kernel/qplatformwindow_qpa.cpp
index 01254966f0..2380c6db75 100644
--- a/src/gui/kernel/qplatformwindow_qpa.cpp
+++ b/src/gui/kernel/qplatformwindow_qpa.cpp
@@ -336,6 +336,23 @@ void QPlatformWindow::windowEvent(QEvent *event)
 }
 
 /*!
+    Reimplement this method to start a system size grip drag
+    operation if the system supports it and return true to indicate
+    success.
+    It is called from the mouse press event handler of the size grip.
+
+    The default implementation is empty and does nothing with \a pos
+    and \a corner.
+*/
+
+bool QPlatformWindow::startSystemResize(const QPoint &pos, Qt::Corner corner)
+{
+    Q_UNUSED(pos)
+    Q_UNUSED(corner)
+    return false;
+}
+
+/*!
     \class QPlatformWindow
     \since 4.8
     \internal