qxcbdrag.h - mozsearch

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant reason:default

#pragma once

#include <qpa/qplatformdrag.h>

#include <private/qsimpledrag_p.h>

#include <xcb/xcb.h>

#include <qbackingstore.h>

#include <qdatetime.h>

#include <qlist.h>

#include <qpixmap.h>

#include <qpoint.h>

#include <qpointer.h>

#include <qrect.h>

#include <qxcbobject.h>

QT_REQUIRE_CONFIG(draganddrop);

QT_BEGIN_NAMESPACE

class QWindow;

class QPlatformWindow;

class QXcbConnection;

class QXcbWindow;

class QXcbDropData;

class QXcbScreen;

class QDrag;

class QShapedPixmapWindow;

class QXcbDrag : public QXcbObject, public QBasicDrag, public QXcbWindowEventListener

public:

    QXcbDrag(QXcbConnection *c);

    ~QXcbDrag();

    bool eventFilter(QObject *o, QEvent *e) override;

    void startDrag() override;

    void cancel() override;

    void move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;

    void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;

    void endDrag() override;

    Qt::DropAction defaultAction(Qt::DropActions possibleActions, Qt::KeyboardModifiers modifiers) const override;

    void handlePropertyNotifyEvent(const xcb_property_notify_event_t *event) override;

    void handleEnter(QPlatformWindow *window, const xcb_client_message_event_t *event, xcb_window_t proxy = 0);

    void handlePosition(QPlatformWindow *w, const xcb_client_message_event_t *event);

    void handleLeave(QPlatformWindow *w, const xcb_client_message_event_t *event);

    void handleDrop(QPlatformWindow *, const xcb_client_message_event_t *event,

                    Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });

    void handleStatus(const xcb_client_message_event_t *event);

    void handleSelectionRequest(const xcb_selection_request_event_t *event);

    void handleFinished(const xcb_client_message_event_t *event);

    bool dndEnable(QXcbWindow *win, bool on);

    bool ownsDragObject() const override;

    void updatePixmap();

    xcb_timestamp_t targetTime() { return target_time; }

protected:

    void timerEvent(QTimerEvent* e) override;

    bool findXdndAwareTarget(const QPoint &globalPos, xcb_window_t *target_out);

private:

    friend class QXcbDropData;

    void init();

    void handle_xdnd_position(QPlatformWindow *w, const xcb_client_message_event_t *event,

                              Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });

    void handle_xdnd_status(const xcb_client_message_event_t *event);

    void send_leave();

    Qt::DropAction toDropAction(xcb_atom_t atom) const;

    Qt::DropActions toDropActions(const QList<xcb_atom_t> &atoms) const;

    xcb_atom_t toXdndAction(Qt::DropAction a) const;

    void readActionList();

    void setActionList(Qt::DropAction requestedAction, Qt::DropActions supportedActions);

    void startListeningForActionListChanges();

    void stopListeningForActionListChanges();

    QPointer<QWindow> initiatorWindow;

    QPointer<QWindow> currentWindow;

    QPoint currentPosition;

    QXcbDropData *m_dropData;

    Qt::DropAction accepted_drop_action;

    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;

    // timestamp from XdndPosition and XdndDroptime for retrieving the data

    xcb_timestamp_t target_time;

    xcb_timestamp_t source_time;

    // rectangle in which the answer will be the same

    QRect source_sameanswer;

    bool waiting_for_status;

    // helpers for setting executed drop action outside application

    bool dropped;

    bool canceled;

    // A window from Unity DnD Manager, which does not respect the XDnD spec

    xcb_window_t xdndCollectionWindow = XCB_NONE;

    // top-level window we sent position to last.

    xcb_window_t current_target;

    // window to send events to (always valid if current_target)

    xcb_window_t current_proxy_target;

    QXcbVirtualDesktop *current_virtual_desktop;

    // 10 minute timer used to discard old XdndDrop transactions

    static constexpr std::chrono::minutes XdndDropTransactionTimeout{10};

    QBasicTimer cleanup_timer;

    QList<xcb_atom_t> drag_types;

    QList<xcb_atom_t> current_actions;

    QList<xcb_atom_t> drop_actions;

    struct Transaction

        xcb_timestamp_t timestamp;

        xcb_window_t target;

        xcb_window_t proxy_target;

        QPlatformWindow *targetWindow;

//        QWidget *embedding_widget;

        QPointer<QDrag> drag;

        QTime time;

};

    friend class QTypeInfo<Transaction>;

    QList<Transaction> transactions;

    int transaction_expiry_timer;

    void restartDropExpiryTimer();

    int findTransactionByWindow(xcb_window_t window);

    int findTransactionByTime(xcb_timestamp_t timestamp);

    xcb_window_t findRealWindow(const QPoint & pos, xcb_window_t w, int md, bool ignoreNonXdndAwareWindows);

};

Q_DECLARE_TYPEINFO(QXcbDrag::Transaction, Q_RELOCATABLE_TYPE);

QT_END_NAMESPACE