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 QSIMPLEDRAG_P_H 41 #define QSIMPLEDRAG_P_H 42 43 // 44 // W A R N I N G 45 // ------------- 46 // 47 // This file is not part of the Qt API. It exists purely as an 48 // implementation detail. This header file may change from version to 49 // version without notice, or even be removed. 50 // 51 // We mean it. 52 // 53 54 #include <QtGui/private/qtguiglobal_p.h> 55 #include <qpa/qplatformdrag.h> 56 57 #include <QtCore/QObject> 58 #include <QtCore/QPointer> 59 #include <QtGui/QWindow> 60 61 QT_REQUIRE_CONFIG(draganddrop); 62 63 QT_BEGIN_NAMESPACE 64 65 class QMouseEvent; 66 class QEventLoop; 67 class QDropData; 68 class QShapedPixmapWindow; 69 class QScreen; 70 71 class Q_GUI_EXPORT QBasicDrag : public QPlatformDrag, public QObject 72 { 73 public: 74 ~QBasicDrag(); 75 76 virtual Qt::DropAction drag(QDrag *drag) override; 77 void cancelDrag() override; 78 79 virtual bool eventFilter(QObject *o, QEvent *e) override; 80 81 protected: 82 QBasicDrag(); 83 84 virtual void startDrag(); 85 virtual void cancel(); 86 virtual void move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) = 0; 87 virtual void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) = 0; 88 virtual void endDrag(); 89 90 91 void moveShapedPixmapWindow(const QPoint &deviceIndependentPosition); shapedPixmapWindow()92 QShapedPixmapWindow *shapedPixmapWindow() const { return m_drag_icon_window; } 93 void recreateShapedPixmapWindow(QScreen *screen, const QPoint &pos); 94 void updateCursor(Qt::DropAction action); 95 canDrop()96 bool canDrop() const { return m_can_drop; } setCanDrop(bool c)97 void setCanDrop(bool c) { m_can_drop = c; } 98 useCompositing()99 bool useCompositing() const { return m_useCompositing; } setUseCompositing(bool on)100 void setUseCompositing(bool on) { m_useCompositing = on; } 101 setScreen(QScreen * screen)102 void setScreen(QScreen *screen) { m_screen = screen; } 103 executedDropAction()104 Qt::DropAction executedDropAction() const { return m_executed_drop_action; } setExecutedDropAction(Qt::DropAction da)105 void setExecutedDropAction(Qt::DropAction da) { m_executed_drop_action = da; } 106 drag()107 QDrag *drag() const { return m_drag; } 108 109 protected: 110 QWindow *m_sourceWindow = nullptr; 111 QPointer<QWindow> m_windowUnderCursor = nullptr; 112 113 private: 114 void enableEventFilter(); 115 void disableEventFilter(); 116 void restoreCursor(); 117 void exitDndEventLoop(); 118 119 #ifndef QT_NO_CURSOR 120 bool m_dndHasSetOverrideCursor = false; 121 #endif 122 QEventLoop *m_eventLoop = nullptr; 123 Qt::DropAction m_executed_drop_action = Qt::IgnoreAction; 124 bool m_can_drop = false; 125 QDrag *m_drag = nullptr; 126 QShapedPixmapWindow *m_drag_icon_window = nullptr; 127 bool m_useCompositing = true; 128 QScreen *m_screen = nullptr; 129 QPoint m_lastPos; 130 }; 131 132 class Q_GUI_EXPORT QSimpleDrag : public QBasicDrag 133 { 134 public: 135 QSimpleDrag(); 136 137 protected: 138 virtual void startDrag() override; 139 virtual void cancel() override; 140 virtual void move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override; 141 virtual void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override; 142 }; 143 144 QT_END_NAMESPACE 145 146 #endif 147