summaryrefslogtreecommitdiffstats
path: root/src/plugins/platforms/cocoa/qnsview_dragging.mm
blob: 2e88b6a08fa944876505c608da50b925621f6fd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

// This file is included from qnsview.mm, and only used to organize the code

@implementation QNSView (Dragging)

-(void)registerDragTypes
{
    QMacAutoReleasePool pool;

    NSString * const mimeTypeGeneric = @"com.trolltech.qt.MimeTypeName";
    NSMutableArray<NSString *> *supportedTypes = [NSMutableArray<NSString *> arrayWithArray:@[
                   NSPasteboardTypeColor, NSPasteboardTypeString,
                   NSPasteboardTypeFileURL, @"com.adobe.encapsulated-postscript", NSPasteboardTypeTIFF,
                   NSPasteboardTypeRTF, NSPasteboardTypeTabularText, NSPasteboardTypeFont,
                   NSPasteboardTypeRuler, NSFileContentsPboardType,
                   NSPasteboardTypeRTFD , NSPasteboardTypeHTML,
                   NSPasteboardTypeURL, NSPasteboardTypePDF, (NSString *)kUTTypeVCard,
                   (NSString *)kPasteboardTypeFileURLPromise, (NSString *)kUTTypeInkText,
                   NSPasteboardTypeMultipleTextSelection, mimeTypeGeneric]];

    // Add custom types supported by the application
    for (const QString &customType : qt_mac_enabledDraggedTypes())
        [supportedTypes addObject:customType.toNSString()];

    [self registerForDraggedTypes:supportedTypes];
}

static QWindow *findEventTargetWindow(QWindow *candidate)
{
    while (candidate) {
        if (!(candidate->flags() & Qt::WindowTransparentForInput))
            return candidate;
        candidate = candidate->parent();
    }
    return candidate;
}

static QPoint mapWindowCoordinates(QWindow *source, QWindow *target, QPoint point)
{
    return target->mapFromGlobal(source->mapToGlobal(point));
}

- (NSDragOperation)draggingSession:(NSDraggingSession *)session sourceOperationMaskForDraggingContext:(NSDraggingContext)context
{
    Q_UNUSED(session);
    Q_UNUSED(context);

    QCocoaDrag* nativeDrag = QCocoaIntegration::instance()->drag();
    return qt_mac_mapDropActions(nativeDrag->currentDrag()->supportedActions());
}

- (BOOL)ignoreModifierKeysForDraggingSession:(NSDraggingSession *)session
{
    Q_UNUSED(session);
    // According to the "Dragging Sources" chapter on Cocoa DnD Programming
    // (https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/DragandDrop/Concepts/dragsource.html),
    // if the control, option, or command key is pressed, the source’s
    // operation mask is filtered to only contain a reduced set of operations.
    //
    // Since Qt already takes care of tracking the keyboard modifiers, we
    // don't need (or want) Cocoa to filter anything. Instead, we'll let
    // the application do the actual filtering.
    return YES;
}

- (BOOL)wantsPeriodicDraggingUpdates
{
    // From the documentation:
    //
    // "If the destination returns NO, these messages are sent only when the mouse moves
    //  or a modifier flag changes. Otherwise the destination gets the default behavior,
    //  where it receives periodic dragging-updated messages even if nothing changes."
    //
    // We do not want these constant drag update events while mouse is stationary,
    // since we do all animations (autoscroll) with timers.
    return NO;
}


- (BOOL)wantsPeriodicDraggingUpdates:(void *)dummy
{
    // This method never gets called. It's a workaround for Apple's
    // bug: they first respondsToSelector : @selector(wantsPeriodicDraggingUpdates:)
    // (note ':') and then call -wantsPeriodicDraggingUpdate (without colon).
    // So, let's make them happy.
    Q_UNUSED(dummy);

    return NO;
}

- (void)updateCursorFromDragResponse:(QPlatformDragQtResponse)response drag:(QCocoaDrag *)drag
{
    const QPixmap pixmapCursor = drag->currentDrag()->dragCursor(response.acceptedAction());
    NSCursor *nativeCursor = nil;

    if (pixmapCursor.isNull()) {
        switch (response.acceptedAction()) {
        case Qt::CopyAction:
            nativeCursor = [NSCursor dragCopyCursor];
            break;
        case Qt::LinkAction:
            nativeCursor = [NSCursor dragLinkCursor];
            break;
        case Qt::IgnoreAction:
            // Uncomment the next lines if forbidden cursor is wanted on undroppable targets.
            /*nativeCursor = [NSCursor operationNotAllowedCursor];
            break;*/
        case Qt::MoveAction:
        default:
            nativeCursor = [NSCursor arrowCursor];
            break;
        }
    } else {
        auto *nsimage = [NSImage imageFromQImage:pixmapCursor.toImage()];
        nativeCursor = [[NSCursor alloc] initWithImage:nsimage hotSpot:NSZeroPoint];
    }

    // Change the cursor
    [nativeCursor set];

    // Make sure the cursor is updated correctly if the mouse does not move and window is under cursor
    // by creating a fake move event, unless on 10.14 and later where doing so will trigger a security
    // warning dialog. FIXME: Find a way to update the cursor without fake mouse events.
    if (QOperatingSystemVersion::current() >= QOperatingSystemVersion::MacOSMojave)
        return;

    if (m_updatingDrag)
        return;

    QCFType<CGEventRef> moveEvent = CGEventCreateMouseEvent(
        nullptr, kCGEventMouseMoved, QCursor::pos().toCGPoint(),
        kCGMouseButtonLeft // ignored
    );
    CGEventPost(kCGHIDEventTap, moveEvent);
}

- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender
{
    return [self handleDrag:(QEvent::DragEnter) sender:sender];
}

- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender
{
    QScopedValueRollback<bool> rollback(m_updatingDrag, true);
    return [self handleDrag:(QEvent::DragMove) sender:sender];
}

// Sends drag update to Qt, return the action
- (NSDragOperation)handleDrag:(QEvent::Type)dragType sender:(id<NSDraggingInfo>)sender
{
    if (!m_platformWindow)
        return NSDragOperationNone;

    QPoint windowPoint = QPointF::fromCGPoint([self convertPoint:sender.draggingLocation fromView:nil]).toPoint();

    Qt::DropActions qtAllowed = qt_mac_mapNSDragOperations(sender.draggingSourceOperationMask);

    QWindow *target = findEventTargetWindow(m_platformWindow->window());
    if (!target)
        return NSDragOperationNone;

    const auto modifiers = [QNSView convertKeyModifiers:NSApp.currentEvent.modifierFlags];
    const auto buttons = currentlyPressedMouseButtons();
    const auto point = mapWindowCoordinates(m_platformWindow->window(), target, windowPoint);

    if (dragType == QEvent::DragEnter)
        qCDebug(lcQpaMouse) << dragType << self << "at" << windowPoint;
    else
        qCDebug(lcQpaMouse) << dragType << "at" << windowPoint << "with" << buttons;

    QPlatformDragQtResponse response(false, Qt::IgnoreAction, QRect());
    QCocoaDrag* nativeDrag = QCocoaIntegration::instance()->drag();
    if (nativeDrag->currentDrag()) {
        // The drag was started from within the application
        response = QWindowSystemInterface::handleDrag(target, nativeDrag->dragMimeData(),
                                                      point, qtAllowed, buttons, modifiers);
        [self updateCursorFromDragResponse:response drag:nativeDrag];
    } else {
        QCocoaDropData mimeData(sender.draggingPasteboard);
        response = QWindowSystemInterface::handleDrag(target, &mimeData,
                                                      point, qtAllowed, buttons, modifiers);
    }

    return qt_mac_mapDropAction(response.acceptedAction());
}

- (void)draggingExited:(id<NSDraggingInfo>)sender
{
    if (!m_platformWindow)
        return;

    QWindow *target = findEventTargetWindow(m_platformWindow->window());
    if (!target)
        return;

    QPoint windowPoint = QPointF::fromCGPoint([self convertPoint:sender.draggingLocation fromView:nil]).toPoint();

    qCDebug(lcQpaMouse) << QEvent::DragLeave << self << "at" << windowPoint;

    // Send 0 mime data to indicate drag exit
    QWindowSystemInterface::handleDrag(target, nullptr,
                                       mapWindowCoordinates(m_platformWindow->window(), target, windowPoint),
                                       Qt::IgnoreAction, Qt::NoButton, Qt::NoModifier);
}

// Called on drop, send the drop to Qt and return if it was accepted
- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender
{
    if (!m_platformWindow)
        return false;

    QWindow *target = findEventTargetWindow(m_platformWindow->window());
    if (!target)
        return false;

    QPoint windowPoint = QPointF::fromCGPoint([self convertPoint:sender.draggingLocation fromView:nil]).toPoint();

    Qt::DropActions qtAllowed = qt_mac_mapNSDragOperations(sender.draggingSourceOperationMask);

    QPlatformDropQtResponse response(false, Qt::IgnoreAction);
    QCocoaDrag* nativeDrag = QCocoaIntegration::instance()->drag();
    const auto modifiers = [QNSView convertKeyModifiers:NSApp.currentEvent.modifierFlags];
    const auto buttons = currentlyPressedMouseButtons();
    const auto point = mapWindowCoordinates(m_platformWindow->window(), target, windowPoint);

    qCDebug(lcQpaMouse) << QEvent::Drop << "at" << windowPoint << "with" << buttons;

    if (nativeDrag->currentDrag()) {
        // The drag was started from within the application
        response = QWindowSystemInterface::handleDrop(target, nativeDrag->dragMimeData(),
                                                      point, qtAllowed, buttons, modifiers);
        nativeDrag->setAcceptedAction(response.acceptedAction());
    } else {
        QCocoaDropData mimeData(sender.draggingPasteboard);
        response = QWindowSystemInterface::handleDrop(target, &mimeData,
                                                      point, qtAllowed, buttons, modifiers);
    }
    return response.isAccepted();
}

- (void)draggingSession:(NSDraggingSession *)session endedAtPoint:(NSPoint)screenPoint operation:(NSDragOperation)operation
{
    Q_UNUSED(session);
    Q_UNUSED(screenPoint);
    Q_UNUSED(operation);

    if (!m_platformWindow)
        return;

    QWindow *target = findEventTargetWindow(m_platformWindow->window());
    if (!target)
        return;

    QCocoaIntegration::instance()->drag();

    // Qt starts drag-and-drop on a mouse button press event. Cococa in
    // this case won't send the matching release event, so we have to
    // synthesize it here.
    m_buttons = currentlyPressedMouseButtons();
    const auto modifiers = [QNSView convertKeyModifiers:NSApp.currentEvent.modifierFlags];

    NSPoint windowPoint = [self.window convertRectFromScreen:NSMakeRect(screenPoint.x, screenPoint.y, 1, 1)].origin;
    NSPoint nsViewPoint = [self convertPoint: windowPoint fromView: nil];

    QPoint qtWindowPoint(nsViewPoint.x, nsViewPoint.y);
    QPoint qtScreenPoint = QCocoaScreen::mapFromNative(screenPoint).toPoint();

    QWindowSystemInterface::handleMouseEvent(
        target,
        mapWindowCoordinates(m_platformWindow->window(), target, qtWindowPoint),
        qtScreenPoint,
        m_buttons,
        Qt::NoButton,
        QEvent::MouseButtonRelease,
        modifiers);

    qCDebug(lcQpaMouse) << "Drag session" << session << "ended, with" << m_buttons;
}

@end