X11 DnD implementation

Initial code for DnD on X11. Only Xdnd based,
Motif DnD is being ignored.

The code is currently limited to dropping
stuff onto the application. Starting drags
is not yet implemented.

Reviewed-by: Samuel

1 files changed, 122 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbdrag.h b/src/plugins/platforms/xcb/qxcbdrag.h
new file mode 100644
index 0000000000..4aab35b7b1
--- /dev/null
+++ b/src/plugins/platforms/xcb/qxcbdrag.h
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QXCBDRAG_H
+#define QXCBDRAG_H
+
+#include <qlist.h>
+#include <qplatformdrag_qpa.h>
+#include <qnamespace.h>
+#include <xcb/xcb.h>
+#include <qpoint.h>
+#include <qrect.h>
+#include <qsharedpointer.h>
+
+QT_BEGIN_NAMESPACE
+
+class QMouseEvent;
+class QWindow;
+class QXcbConnection;
+class QXcbWindow;
+class QDropData;
+
+class QXcbDrag : public QPlatformDrag
+{
+public:
+    QXcbDrag(QXcbConnection *c);
+    ~QXcbDrag();
+
+    virtual QMimeData *platformDropData();
+
+//    virtual Qt::DropAction drag(QDrag *);
+
+    virtual void startDrag();
+    virtual void cancel();
+    virtual void move(const QMouseEvent *me);
+    virtual void drop(const QMouseEvent *me);
+
+    void handleEnter(QWindow *window, const xcb_client_message_event_t *event);
+    void handlePosition(QWindow *w, const xcb_client_message_event_t *event, bool passive);
+    void handleStatus(QWindow *w, const xcb_client_message_event_t *event, bool passive);
+    void handleLeave(QWindow *w, const xcb_client_message_event_t *event, bool /*passive*/);
+    void handleDrop(QWindow *, const xcb_client_message_event_t *event, bool passive);
+
+    bool dndEnable(QXcbWindow *win, bool on);
+
+    QXcbConnection *connection() const { return m_connection; }
+
+private:
+    friend class QDropData;
+
+    void handle_xdnd_position(QWindow *w, const xcb_client_message_event_t *event, bool passive);
+    void handle_xdnd_status(QWindow *, const xcb_client_message_event_t *event, bool);
+
+    Qt::DropAction toDropAction(xcb_atom_t atom) const;
+    xcb_atom_t toXdndAction(Qt::DropAction a) const;
+
+    QWeakPointer<QWindow> currentWindow;
+    QPoint currentPosition;
+
+    QXcbConnection *m_connection;
+    QDropData *dropData;
+
+    QWindow *desktop_proxy;
+
+    xcb_atom_t xdnd_dragsource;
+
+    // the types in this drop. 100 is no good, but at least it's big.
+    enum { xdnd_max_type = 100 };
+    QList<xcb_atom_t> xdnd_types;
+
+    xcb_timestamp_t target_time;
+    Qt::DropAction last_target_accepted_action;
+
+    // rectangle in which the answer will be the same
+    QRect source_sameanswer;
+    bool waiting_for_status;
+
+    // window to send events to (always valid if current_target)
+    xcb_window_t current_proxy_target;
+};
+
+QT_END_NAMESPACE
+
+#endif