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91 lines
3.3 KiB
91 lines
3.3 KiB
/*
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* Copyright (C) 2016 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/*
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* Note:
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* This is a workaround for the following Qt5 bugs.
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*
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* #49947: Drop events have broken mimeData()->urls() and text/uri-list.
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* #47981: Qt5.4 regression: Dropping text/urilist over browser windows stop working.
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*
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* Related LXQt bug: https://github.com/lxde/lxqt/issues/688
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*
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* This workaround is not 100% reliable, but it should work most of the time.
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* In theory, when there are multiple drag and drops at nearly the same time and
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* you are using a remote X11 instance via a slow network connection, this workaround
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* might break. However, that should be a really rare corner case.
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*
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* How this fix works:
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* 1. Hook QApplication to filter raw X11 events
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* 2. Intercept SelectionRequest events sent from XDnd target window.
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* 3. Check if the data requested have the type "text/uri-list" or "x-moz-url"
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* 4. Bypass the broken Qt5 code and send the mime data to the target with our own code.
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*
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* The mime data is obtained during the most recent mouse button release event.
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* This can be incorrect in some corner cases, but it is still a simple and
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* good enough approximation that returns the correct data most of the time.
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* Anyway, a workarond is just a workaround. Ask Qt developers to fix their bugs.
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*/
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#ifndef XDNDWORKAROUND_H
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#define XDNDWORKAROUND_H
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#include <QtGlobal>
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#include <QObject>
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#include <QAbstractNativeEventFilter>
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#include <xcb/xcb.h>
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#include <QByteArray>
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class QDrag;
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class XdndWorkaround : public QAbstractNativeEventFilter
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{
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public:
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XdndWorkaround();
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~XdndWorkaround();
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bool nativeEventFilter(const QByteArray & eventType, void * message, long * result) override;
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static QByteArray atomName(xcb_atom_t atom);
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static xcb_atom_t internAtom(const char* name, int len = -1);
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static QByteArray windowProperty(xcb_window_t window, xcb_atom_t propAtom, xcb_atom_t typeAtom, int len);
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static void setWindowProperty(xcb_window_t window, xcb_atom_t propAtom, xcb_atom_t typeAtom, void* data, int len, int format = 8);
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private:
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bool clientMessage(xcb_client_message_event_t* event);
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bool selectionNotify(xcb_selection_notify_event_t* event);
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// This part is for Qt >= 5.4 only
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#if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 0))
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private:
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bool selectionRequest(xcb_selection_request_event_t* event);
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bool genericEvent(xcb_ge_generic_event_t *event);
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// _QBasicDrag* xcbDrag() const;
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void buttonRelease();
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QDrag* lastDrag_;
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// xinput related
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bool xinput2Enabled_;
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int xinputOpCode_;
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int xinputEventBase_;
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int xinputErrorBase_;
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#endif // Qt >= 5.4
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};
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#endif // XDNDWORKAROUND_H
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