1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#pragma once
5
6#include <qpa/qplatformdrag.h>
7#include <private/qsimpledrag_p.h>
8#include <xcb/xcb.h>
9#include <qbackingstore.h>
10#include <qdatetime.h>
11#include <qlist.h>
12#include <qpixmap.h>
13#include <qpoint.h>
14#include <qpointer.h>
15#include <qrect.h>
16#include <qxcbobject.h>
17
18#include <QtCore/QDebug>
19
20QT_REQUIRE_CONFIG(draganddrop);
21
22QT_BEGIN_NAMESPACE
23
24class QWindow;
25class QPlatformWindow;
26class QXcbConnection;
27class QXcbWindow;
28class QXcbDropData;
29class QXcbScreen;
30class QDrag;
31class QShapedPixmapWindow;
32
33class QXcbDrag : public QXcbObject, public QBasicDrag, public QXcbWindowEventListener
34{
35public:
36 QXcbDrag(QXcbConnection *c);
37 ~QXcbDrag();
38
39 bool eventFilter(QObject *o, QEvent *e) override;
40
41 void startDrag() override;
42 void cancel() override;
43 void move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;
44 void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;
45 void endDrag() override;
46
47 Qt::DropAction defaultAction(Qt::DropActions possibleActions, Qt::KeyboardModifiers modifiers) const override;
48
49 void handlePropertyNotifyEvent(const xcb_property_notify_event_t *event) override;
50
51 void handleEnter(QPlatformWindow *window, const xcb_client_message_event_t *event, xcb_window_t proxy = 0);
52 void handlePosition(QPlatformWindow *w, const xcb_client_message_event_t *event);
53 void handleLeave(QPlatformWindow *w, const xcb_client_message_event_t *event);
54 void handleDrop(QPlatformWindow *, const xcb_client_message_event_t *event,
55 Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
56
57 void handleStatus(const xcb_client_message_event_t *event);
58 void handleSelectionRequest(const xcb_selection_request_event_t *event);
59 void handleFinished(const xcb_client_message_event_t *event);
60
61 bool dndEnable(QXcbWindow *win, bool on);
62 bool ownsDragObject() const override;
63
64 void updatePixmap();
65 xcb_timestamp_t targetTime() { return target_time; }
66
67protected:
68 void timerEvent(QTimerEvent* e) override;
69
70 bool findXdndAwareTarget(const QPoint &globalPos, xcb_window_t *target_out);
71
72private:
73 friend class QXcbDropData;
74
75 void init();
76
77 void handle_xdnd_position(QPlatformWindow *w, const xcb_client_message_event_t *event,
78 Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
79 void handle_xdnd_status(const xcb_client_message_event_t *event);
80 void send_leave();
81
82 Qt::DropAction toDropAction(xcb_atom_t atom) const;
83 Qt::DropActions toDropActions(const QList<xcb_atom_t> &atoms) const;
84 xcb_atom_t toXdndAction(Qt::DropAction a) const;
85
86 void readActionList();
87 void setActionList(Qt::DropAction requestedAction, Qt::DropActions supportedActions);
88 void startListeningForActionListChanges();
89 void stopListeningForActionListChanges();
90
91 QPointer<QWindow> initiatorWindow;
92 QPointer<QWindow> currentWindow;
93 QPoint currentPosition;
94
95 QXcbDropData *m_dropData;
96 Qt::DropAction accepted_drop_action;
97
98 QWindow *desktop_proxy;
99
100 xcb_atom_t xdnd_dragsource;
101
102 // the types in this drop. 100 is no good, but at least it's big.
103 enum { xdnd_max_type = 100 };
104 QList<xcb_atom_t> xdnd_types;
105
106 // timestamp from XdndPosition and XdndDroptime for retrieving the data
107 xcb_timestamp_t target_time;
108 xcb_timestamp_t source_time;
109
110 // rectangle in which the answer will be the same
111 QRect source_sameanswer;
112 bool waiting_for_status;
113
114 // helpers for setting executed drop action outside application
115 bool dropped;
116 bool canceled;
117
118 // A window from Unity DnD Manager, which does not respect the XDnD spec
119 xcb_window_t xdndCollectionWindow = XCB_NONE;
120
121 // top-level window we sent position to last.
122 xcb_window_t current_target;
123 // window to send events to (always valid if current_target)
124 xcb_window_t current_proxy_target;
125
126 QXcbVirtualDesktop *current_virtual_desktop;
127
128 // 10 minute timer used to discard old XdndDrop transactions
129 static constexpr std::chrono::minutes XdndDropTransactionTimeout{10};
130 int cleanup_timer;
131
132 QList<xcb_atom_t> drag_types;
133
134 QList<xcb_atom_t> current_actions;
135 QList<xcb_atom_t> drop_actions;
136
137 struct Transaction
138 {
139 xcb_timestamp_t timestamp;
140 xcb_window_t target;
141 xcb_window_t proxy_target;
142 QPlatformWindow *targetWindow;
143// QWidget *embedding_widget;
144 QPointer<QDrag> drag;
145 QTime time;
146 };
147 friend class QTypeInfo<Transaction>;
148 QList<Transaction> transactions;
149
150 int transaction_expiry_timer;
151 void restartDropExpiryTimer();
152 int findTransactionByWindow(xcb_window_t window);
153 int findTransactionByTime(xcb_timestamp_t timestamp);
154 xcb_window_t findRealWindow(const QPoint & pos, xcb_window_t w, int md, bool ignoreNonXdndAwareWindows);
155};
156Q_DECLARE_TYPEINFO(QXcbDrag::Transaction, Q_RELOCATABLE_TYPE);
157
158QT_END_NAMESPACE
159

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