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>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 390628d291..a1ac5c5eb1 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -1670,4 +1670,37 @@ void QXcbWindow::setCursor(xcb_cursor_t cursor)
     xcb_flush(xcb_connection());
 }
 
+#ifdef XCB_USE_XLIB
+
+bool QXcbWindow::startSystemResize(const QPoint &pos, Qt::Corner corner)
+{
+    const xcb_atom_t moveResize = connection()->atom(QXcbAtom::_NET_WM_MOVERESIZE);
+    if (!connection()->wmSupport()->isSupportedByWM(moveResize))
+        return false;
+    XEvent xev;
+    xev.xclient.type = ClientMessage;
+    xev.xclient.message_type = moveResize;
+    Display *display = (Display *)connection()->xlib_display();
+    xev.xclient.display = display;
+    xev.xclient.window = xcb_window();
+    xev.xclient.format = 32;
+    const QPoint globalPos = window()->mapToGlobal(pos);
+    xev.xclient.data.l[0] = globalPos.x();
+    xev.xclient.data.l[1] = globalPos.y();
+    const bool bottom = corner == Qt::BottomRightCorner || corner == Qt::BottomLeftCorner;
+    const bool left = corner == Qt::BottomLeftCorner || corner == Qt::TopLeftCorner;
+    if (bottom)
+        xev.xclient.data.l[2] = left ? 6 : 4; // bottomleft/bottomright
+    else
+        xev.xclient.data.l[2] = left ? 0 : 2; // topleft/topright
+    xev.xclient.data.l[3] = Button1;
+    xev.xclient.data.l[4] = 0;
+    XUngrabPointer(display, CurrentTime);
+    XSendEvent(display, m_screen->root(), False,
+               SubstructureRedirectMask | SubstructureNotifyMask, &xev);
+    return true;
+}
+
+#endif // XCB_USE_XLIB
+
 QT_END_NAMESPACE