1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtGui module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QXCBDRAG_H
41#define QXCBDRAG_H
42
43#include <qpa/qplatformdrag.h>
44#include <private/qsimpledrag_p.h>
45#include <qxcbobject.h>
46#include <xcb/xcb.h>
47#include <qpoint.h>
48#include <qrect.h>
49#include <qsharedpointer.h>
50#include <qpointer.h>
51#include <qvector.h>
52#include <qdatetime.h>
53#include <qpixmap.h>
54#include <qbackingstore.h>
55
56#include <QtCore/QDebug>
57
58QT_REQUIRE_CONFIG(draganddrop);
59
60QT_BEGIN_NAMESPACE
61
62class QWindow;
63class QPlatformWindow;
64class QXcbConnection;
65class QXcbWindow;
66class QXcbDropData;
67class QXcbScreen;
68class QDrag;
69class QShapedPixmapWindow;
70
71class QXcbDrag : public QXcbObject, public QBasicDrag, public QXcbWindowEventListener
72{
73public:
74 QXcbDrag(QXcbConnection *c);
75 ~QXcbDrag();
76
77 bool eventFilter(QObject *o, QEvent *e) override;
78
79 void startDrag() override;
80 void cancel() override;
81 void move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;
82 void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;
83 void endDrag() override;
84
85 Qt::DropAction defaultAction(Qt::DropActions possibleActions, Qt::KeyboardModifiers modifiers) const override;
86
87 void handlePropertyNotifyEvent(const xcb_property_notify_event_t *event) override;
88
89 void handleEnter(QPlatformWindow *window, const xcb_client_message_event_t *event, xcb_window_t proxy = 0);
90 void handlePosition(QPlatformWindow *w, const xcb_client_message_event_t *event);
91 void handleLeave(QPlatformWindow *w, const xcb_client_message_event_t *event);
92 void handleDrop(QPlatformWindow *, const xcb_client_message_event_t *event,
93 Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
94
95 void handleStatus(const xcb_client_message_event_t *event);
96 void handleSelectionRequest(const xcb_selection_request_event_t *event);
97 void handleFinished(const xcb_client_message_event_t *event);
98
99 bool dndEnable(QXcbWindow *win, bool on);
100 bool ownsDragObject() const override;
101
102 void updatePixmap();
103 xcb_timestamp_t targetTime() { return target_time; }
104
105protected:
106 void timerEvent(QTimerEvent* e) override;
107
108 bool findXdndAwareTarget(const QPoint &globalPos, xcb_window_t *target_out);
109
110private:
111 friend class QXcbDropData;
112
113 void init();
114
115 void handle_xdnd_position(QPlatformWindow *w, const xcb_client_message_event_t *event,
116 Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
117 void handle_xdnd_status(const xcb_client_message_event_t *event);
118 void send_leave();
119
120 Qt::DropAction toDropAction(xcb_atom_t atom) const;
121 Qt::DropActions toDropActions(const QVector<xcb_atom_t> &atoms) const;
122 xcb_atom_t toXdndAction(Qt::DropAction a) const;
123
124 void readActionList();
125 void setActionList(Qt::DropAction requestedAction, Qt::DropActions supportedActions);
126 void startListeningForActionListChanges();
127 void stopListeningForActionListChanges();
128
129 QPointer<QWindow> initiatorWindow;
130 QPointer<QWindow> currentWindow;
131 QPoint currentPosition;
132
133 QXcbDropData *m_dropData;
134 Qt::DropAction accepted_drop_action;
135
136 QWindow *desktop_proxy;
137
138 xcb_atom_t xdnd_dragsource;
139
140 // the types in this drop. 100 is no good, but at least it's big.
141 enum { xdnd_max_type = 100 };
142 QVector<xcb_atom_t> xdnd_types;
143
144 // timestamp from XdndPosition and XdndDroptime for retrieving the data
145 xcb_timestamp_t target_time;
146 xcb_timestamp_t source_time;
147
148 // rectangle in which the answer will be the same
149 QRect source_sameanswer;
150 bool waiting_for_status;
151
152 // helpers for setting executed drop action outside application
153 bool dropped;
154 bool canceled;
155
156 // A window from Unity DnD Manager, which does not respect the XDnD spec
157 xcb_window_t xdndCollectionWindow = XCB_NONE;
158
159 // top-level window we sent position to last.
160 xcb_window_t current_target;
161 // window to send events to (always valid if current_target)
162 xcb_window_t current_proxy_target;
163
164 QXcbVirtualDesktop *current_virtual_desktop;
165
166 // 10 minute timer used to discard old XdndDrop transactions
167 enum { XdndDropTransactionTimeout = 600000 };
168 int cleanup_timer;
169
170 QVector<xcb_atom_t> drag_types;
171
172 QVector<xcb_atom_t> current_actions;
173 QVector<xcb_atom_t> drop_actions;
174
175 struct Transaction
176 {
177 xcb_timestamp_t timestamp;
178 xcb_window_t target;
179 xcb_window_t proxy_target;
180 QPlatformWindow *targetWindow;
181// QWidget *embedding_widget;
182 QPointer<QDrag> drag;
183 QTime time;
184 };
185 friend class QTypeInfo<Transaction>;
186 QVector<Transaction> transactions;
187
188 int transaction_expiry_timer;
189 void restartDropExpiryTimer();
190 int findTransactionByWindow(xcb_window_t window);
191 int findTransactionByTime(xcb_timestamp_t timestamp);
192 xcb_window_t findRealWindow(const QPoint & pos, xcb_window_t w, int md, bool ignoreNonXdndAwareWindows);
193};
194Q_DECLARE_TYPEINFO(QXcbDrag::Transaction, Q_MOVABLE_TYPE);
195
196QT_END_NAMESPACE
197
198#endif
199

source code of qtbase/src/plugins/platforms/xcb/qxcbdrag.h