Implement XEmbed protocol

Add a static QWindow::fromWinId(WId id) constructor which can be used to
create a QWindow object representing windows created by other processes.
Then, QWindow::setParent() can be used to embed a window into a foreign
window socket and QWindow::setTransientParent() to stick the current
window on top of a foreign window.

The changes in the QtWidgets module ensure that the focus chain (TAB
navigation) correctly works when a QtWidgets-based window is embedded
into another application.

As far as the platform implementation is concerned, this commit only
implements the embedding functionality in the XCB plugin. So, this is
roughly equivalent to the Qt4 QX11EmbedWidget functionality.

Change-Id: Iff8f7b9ee974d33fb30f36056f7838b433a413c7
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index 3b5404684f..1810a58c7b 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -87,6 +87,9 @@ public:
     void setParent(const QPlatformWindow *window);
 
     bool isExposed() const;
+    bool isEmbedded(const QPlatformWindow *parentWindow) const;
+    QPoint mapToGlobal(const QPoint &pos) const;
+    QPoint mapFromGlobal(const QPoint &pos) const;
 
     void setWindowTitle(const QString &title);
     void setWindowIcon(const QIcon &icon);
@@ -107,6 +110,8 @@ public:
 
     QSurfaceFormat format() const;
 
+    void windowEvent(QEvent *event);
+
     bool startSystemResize(const QPoint &pos, Qt::Corner corner);
 
     void setOpacity(qreal level);
@@ -158,6 +163,9 @@ private:
     void updateDoesNotAcceptFocus(bool doesNotAcceptFocus);
 
     QRect windowToWmGeometry(QRect r) const;
+    void sendXEmbedMessage(xcb_window_t window, long message,
+                           long detail = 0, long data1 = 0, long data2 = 0);
+    void handleXEmbedMessage(const xcb_client_message_event_t *event);
 
     void create();
     void destroy();
@@ -184,6 +192,7 @@ private:
     bool m_deferredActivation;
     bool m_deferredExpose;
     bool m_configureNotifyPending;
+    bool m_embedded;
     xcb_window_t m_netWmUserTimeWindow;
 
     QSurfaceFormat m_format;