source: trunk/src/gui/kernel/qdnd_p.h@ 467

Last change on this file since 467 was 447, checked in by Dmitry A. Kuminov, 15 years ago

gui: DnD: Implemented support for painting in widgets during drag and draw.
File size: 9.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the QtGui module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
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26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
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32** packaging of this file. Please review the following information to
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40****************************************************************************/
41
42#ifndef QDND_P_H
43#define QDND_P_H
44
45//
46// W A R N I N G
47// -------------
48//
49// This file is not part of the Qt API. It exists for the convenience
50// of other Qt classes. This header file may change from version to
51// version without notice, or even be removed.
52//
53// We mean it.
54//
55
56#include "QtCore/qobject.h"
57#include "QtCore/qmap.h"
58#include "QtGui/qmime.h"
59#include "QtGui/qdrag.h"
60#include "QtGui/qpixmap.h"
61#include "QtCore/qpoint.h"
62#include "private/qobject_p.h"
63#ifdef Q_WS_MAC
64# include "private/qt_mac_p.h"
65#endif
66
67#if defined(Q_WS_PM)
68#include "qt_os2.h"
69#endif
70
71#if defined(Q_WS_WIN)
72# include <windows.h>
73# include <objidl.h>
74#endif
75
76QT_BEGIN_NAMESPACE
77
78class QEventLoop;
79
80#if !(defined(QT_NO_DRAGANDDROP) && defined(QT_NO_CLIPBOARD))
81
82class QInternalMimeData : public QMimeData
83{
84 Q_OBJECT
85public:
86 QInternalMimeData();
87 ~QInternalMimeData();
88
89 bool hasFormat(const QString &mimeType) const;
90 QStringList formats() const;
91 static bool canReadData(const QString &mimeType);
92
93
94 static QStringList formatsHelper(const QMimeData *data);
95 static bool hasFormatHelper(const QString &mimeType, const QMimeData *data);
96 static QByteArray renderDataHelper(const QString &mimeType, const QMimeData *data);
97
98protected:
99 QVariant retrieveData(const QString &mimeType, QVariant::Type type) const;
100
101 virtual bool hasFormat_sys(const QString &mimeType) const = 0;
102 virtual QStringList formats_sys() const = 0;
103 virtual QVariant retrieveData_sys(const QString &mimeType, QVariant::Type type) const = 0;
104};
105
106#ifdef Q_WS_WIN
107class QOleDataObject : public IDataObject
108{
109public:
110 explicit QOleDataObject(QMimeData *mimeData);
111 virtual ~QOleDataObject();
112
113 void releaseQt();
114 const QMimeData *mimeData() const;
115 DWORD reportedPerformedEffect() const;
116
117 // IUnknown methods
118 STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
119 STDMETHOD_(ULONG,AddRef)(void);
120 STDMETHOD_(ULONG,Release)(void);
121
122 // IDataObject methods
123 STDMETHOD(GetData)(LPFORMATETC pformatetcIn, LPSTGMEDIUM pmedium);
124 STDMETHOD(GetDataHere)(LPFORMATETC pformatetc, LPSTGMEDIUM pmedium);
125 STDMETHOD(QueryGetData)(LPFORMATETC pformatetc);
126 STDMETHOD(GetCanonicalFormatEtc)(LPFORMATETC pformatetc, LPFORMATETC pformatetcOut);
127 STDMETHOD(SetData)(LPFORMATETC pformatetc, STGMEDIUM FAR * pmedium,
128 BOOL fRelease);
129 STDMETHOD(EnumFormatEtc)(DWORD dwDirection, LPENUMFORMATETC FAR* ppenumFormatEtc);
130 STDMETHOD(DAdvise)(FORMATETC FAR* pFormatetc, DWORD advf,
131 LPADVISESINK pAdvSink, DWORD FAR* pdwConnection);
132 STDMETHOD(DUnadvise)(DWORD dwConnection);
133 STDMETHOD(EnumDAdvise)(LPENUMSTATDATA FAR* ppenumAdvise);
134
135private:
136 ULONG m_refs;
137 QPointer<QMimeData> data;
138 int CF_PERFORMEDDROPEFFECT;
139 DWORD performedEffect;
140};
141
142class QOleEnumFmtEtc : public IEnumFORMATETC
143{
144public:
145 explicit QOleEnumFmtEtc(const QVector<FORMATETC> &fmtetcs);
146 explicit QOleEnumFmtEtc(const QVector<LPFORMATETC> &lpfmtetcs);
147 virtual ~QOleEnumFmtEtc();
148
149 bool isNull() const;
150
151 // IUnknown methods
152 STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
153 STDMETHOD_(ULONG,AddRef)(void);
154 STDMETHOD_(ULONG,Release)(void);
155
156 // IEnumFORMATETC methods
157 STDMETHOD(Next)(ULONG celt, LPFORMATETC rgelt, ULONG FAR* pceltFetched);
158 STDMETHOD(Skip)(ULONG celt);
159 STDMETHOD(Reset)(void);
160 STDMETHOD(Clone)(LPENUMFORMATETC FAR* newEnum);
161
162private:
163 bool copyFormatEtc(LPFORMATETC dest, LPFORMATETC src) const;
164
165 ULONG m_dwRefs;
166 ULONG m_nIndex;
167 QVector<LPFORMATETC> m_lpfmtetcs;
168 bool m_isNull;
169};
170
171#endif
172
173#endif //QT_NO_DRAGANDDROP && QT_NO_CLIPBOARD
174
175#ifndef QT_NO_DRAGANDDROP
176
177class QDragPrivate : public QObjectPrivate
178{
179public:
180 QWidget *source;
181 QWidget *target;
182 QMimeData *data;
183 QPixmap pixmap;
184 QPoint hotspot;
185 Qt::DropActions possible_actions;
186 Qt::DropAction executed_action;
187 QMap<Qt::DropAction, QPixmap> customCursors;
188 Qt::DropAction defaultDropAction;
189};
190
191#if defined(Q_WS_PM)
192class QPMDragData;
193#endif
194
195class QDropData : public QInternalMimeData
196{
197 Q_OBJECT
198public:
199 QDropData();
200 ~QDropData();
201
202protected:
203 bool hasFormat_sys(const QString &mimeType) const;
204 QStringList formats_sys() const;
205 QVariant retrieveData_sys(const QString &mimeType, QVariant::Type type) const;
206
207#if defined(Q_WS_WIN)
208public:
209 LPDATAOBJECT currentDataObject;
210#elif defined(Q_WS_PM)
211 friend class QDragManager;
212 QPMDragData *d;
213#endif
214};
215
216class Q_GUI_EXPORT QDragManager: public QObject {
217 Q_OBJECT
218
219 QDragManager();
220 ~QDragManager();
221 // only friend classes can use QDragManager.
222 friend class QDrag;
223 friend class QDragMoveEvent;
224 friend class QDropEvent;
225 friend class QApplication;
226#ifdef Q_WS_MAC
227 friend class QWidgetPrivate; //dnd is implemented here
228#endif
229
230 bool eventFilter(QObject *, QEvent *);
231 void timerEvent(QTimerEvent*);
232
233public:
234 Qt::DropAction drag(QDrag *);
235
236 void cancel(bool deleteSource = true);
237 void move(const QPoint &);
238 void drop();
239 void updatePixmap();
240 QWidget *source() const { return object ? object->d_func()->source : 0; }
241 QDragPrivate *dragPrivate() const { return object ? object->d_func() : 0; }
242 static QDragPrivate *dragPrivate(QDrag *drag) { return drag ? drag->d_func() : 0; }
243
244 static QDragManager *self();
245 Qt::DropAction defaultAction(Qt::DropActions possibleActions,
246 Qt::KeyboardModifiers modifiers) const;
247
248 QDrag *object;
249
250 void updateCursor();
251
252 bool beingCancelled;
253 bool restoreCursor;
254 bool willDrop;
255 QEventLoop *eventLoop;
256
257 QPixmap dragCursor(Qt::DropAction action) const;
258
259 bool hasCustomDragCursors() const;
260
261 QDropData *dropData;
262
263 void emitActionChanged(Qt::DropAction newAction) { if (object) emit object->actionChanged(newAction); }
264
265 void setCurrentTarget(QWidget *target, bool dropped = false);
266 QWidget *currentTarget();
267
268#ifdef Q_WS_X11
269 QPixmap xdndMimeTransferedPixmap[2];
270 int xdndMimeTransferedPixmapIndex;
271#endif
272
273#ifdef Q_WS_PM
274 void init_sys();
275 void uninit_sys();
276 void sendDropEvent(QWidget *receiver, QEvent *event);
277 MRESULT dispatchDragAndDrop(QWidget *widget, const QMSG &qmsg);
278 bool isInDrag() const { return inDrag; }
279#endif
280
281private:
282 QPixmap *pm_cursor;
283 int n_cursor;
284#ifdef Q_WS_QWS
285 Qt::DropAction currentActionForOverrideCursor;
286#endif
287#ifdef Q_WS_PM
288 bool inDrag;
289#endif
290
291 QWidget *currentDropTarget;
292
293 static QDragManager *instance;
294 Q_DISABLE_COPY(QDragManager)
295};
296
297
298#if defined(Q_WS_WIN)
299
300class QOleDropTarget : public IDropTarget
301{
302public:
303 QOleDropTarget(QWidget* w);
304 virtual ~QOleDropTarget() {}
305
306 void releaseQt();
307
308 // IUnknown methods
309 STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
310 STDMETHOD_(ULONG, AddRef)(void);
311 STDMETHOD_(ULONG, Release)(void);
312
313 // IDropTarget methods
314 STDMETHOD(DragEnter)(LPDATAOBJECT pDataObj, DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect);
315 STDMETHOD(DragOver)(DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect);
316 STDMETHOD(DragLeave)();
317 STDMETHOD(Drop)(LPDATAOBJECT pDataObj, DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect);
318
319private:
320 ULONG m_refs;
321 QWidget* widget;
322 QPointer<QWidget> currentWidget;
323 QRect answerRect;
324 QPoint lastPoint;
325 DWORD chosenEffect;
326 DWORD lastKeyState;
327
328 void sendDragEnterEvent(QWidget *to, DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect);
329};
330
331#endif
332
333#if defined (Q_WS_MAC)
334class QCocoaDropData : public QInternalMimeData
335{
336 Q_OBJECT
337public:
338 QCocoaDropData(CFStringRef pasteboard);
339 ~QCocoaDropData();
340
341protected:
342 bool hasFormat_sys(const QString &mimeType) const;
343 QStringList formats_sys() const;
344 QVariant retrieveData_sys(const QString &mimeType, QVariant::Type type) const;
345public:
346 CFStringRef dropPasteboard;
347};
348#endif
349
350#endif // !QT_NO_DRAGANDDROP
351
352
353QT_END_NAMESPACE
354
355#endif // QDND_P_H
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