summaryrefslogtreecommitdiffstats
path: root/src/plugins/platforms/cocoa/qcocoahelpers.h
blob: 71e72dca4f8f4b25b4176f58fea256ff27be4590 (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
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
/****************************************************************************
**
** Copyright (C) 2016 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QCOCOAHELPERS_H
#define QCOCOAHELPERS_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It provides helper functions
// for the Cocoa plugin. This header file may
// change from version to version without notice, or even be removed.
//
// We mean it.
//

#include <AppKit/AppKit.h>

#include <private/qguiapplication_p.h>
#include <QtCore/qoperatingsystemversion.h>
#include <QtCore/qloggingcategory.h>
#include <QtGui/qpalette.h>
#include <QtGui/qscreen.h>

#include <objc/runtime.h>
#include <objc/message.h>

Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QNSView));

struct mach_header;

QT_BEGIN_NAMESPACE

Q_DECLARE_LOGGING_CATEGORY(lcQpaWindow)
Q_DECLARE_LOGGING_CATEGORY(lcQpaDrawing)
Q_DECLARE_LOGGING_CATEGORY(lcQpaMouse)
Q_DECLARE_LOGGING_CATEGORY(lcQpaScreen)

class QPixmap;
class QString;

// Conversion functions
QStringList qt_mac_NSArrayToQStringList(NSArray<NSString *> *nsarray);
NSMutableArray<NSString *> *qt_mac_QStringListToNSMutableArray(const QStringList &list);

NSDragOperation qt_mac_mapDropAction(Qt::DropAction action);
NSDragOperation qt_mac_mapDropActions(Qt::DropActions actions);
Qt::DropAction qt_mac_mapNSDragOperation(NSDragOperation nsActions);
Qt::DropActions qt_mac_mapNSDragOperations(NSDragOperation nsActions);

template <typename T>
typename std::enable_if<std::is_pointer<T>::value, T>::type
qt_objc_cast(id object)
{
    if ([object isKindOfClass:[typename std::remove_pointer<T>::type class]])
        return static_cast<T>(object);

    return nil;
}

QT_MANGLE_NAMESPACE(QNSView) *qnsview_cast(NSView *view);

// Misc
void qt_mac_transformProccessToForegroundApplication();
QString qt_mac_applicationName();

QPointF qt_mac_flip(const QPointF &pos, const QRectF &reference);
QRectF qt_mac_flip(const QRectF &rect, const QRectF &reference);

Qt::MouseButton cocoaButton2QtButton(NSInteger buttonNum);
Qt::MouseButton cocoaButton2QtButton(NSEvent *event);

QEvent::Type cocoaEvent2QtMouseEvent(NSEvent *event);

Qt::MouseButtons cocoaMouseButtons2QtMouseButtons(NSInteger pressedMouseButtons);
Qt::MouseButtons currentlyPressedMouseButtons();

// strip out '&' characters, and convert "&&" to a single '&', in menu
// text - since menu text is sometimes decorated with these for Windows
// accelerators.
QString qt_mac_removeAmpersandEscapes(QString s);

enum {
    QtCocoaEventSubTypeWakeup       = SHRT_MAX,
    QtCocoaEventSubTypePostMessage  = SHRT_MAX-1
};

class QCocoaPostMessageArgs {
public:
    id target;
    SEL selector;
    int argCount;
    id arg1;
    id arg2;
    QCocoaPostMessageArgs(id target, SEL selector, int argCount=0, id arg1=0, id arg2=0)
        : target(target), selector(selector), argCount(argCount), arg1(arg1), arg2(arg2)
    {
        [target retain];
        [arg1 retain];
        [arg2 retain];
    }

    ~QCocoaPostMessageArgs()
    {
        [arg2 release];
        [arg1 release];
        [target release];
    }
};

template<typename T>
T qt_mac_resolveOption(const T &fallback, const QByteArray &environment)
{
    // check for environment variable
    if (!environment.isEmpty()) {
        QByteArray env = qgetenv(environment);
        if (!env.isEmpty())
            return T(env.toInt()); // works when T is bool, int.
    }

    return fallback;
}

template<typename T>
T qt_mac_resolveOption(const T &fallback, QWindow *window, const QByteArray &property, const QByteArray &environment)
{
    // check for environment variable
    if (!environment.isEmpty()) {
        QByteArray env = qgetenv(environment);
        if (!env.isEmpty())
            return T(env.toInt()); // works when T is bool, int.
    }

    // check for window property
    if (window && !property.isNull()) {
        QVariant windowProperty = window->property(property);
        if (windowProperty.isValid())
            return windowProperty.value<T>();
    }

    // return default value.
    return fallback;
}

// https://stackoverflow.com/a/52722575/2761869
template<class R>
struct backwards_t {
  R r;
  constexpr auto begin() const { using std::rbegin; return rbegin(r); }
  constexpr auto begin() { using std::rbegin; return rbegin(r); }
  constexpr auto end() const { using std::rend; return rend(r); }
  constexpr auto end() { using std::rend; return rend(r); }
};
template<class R>
constexpr backwards_t<R> backwards(R&& r) { return {std::forward<R>(r)}; }

// -------------------------------------------------------------------------

#if !defined(Q_PROCESSOR_X86_64)
#error "32-bit builds are not supported"
#endif

class QMacVersion
{
public:
    enum VersionTarget {
        ApplicationBinary,
        QtLibraries
    };

    static QOperatingSystemVersion buildSDK(VersionTarget target = ApplicationBinary);
    static QOperatingSystemVersion deploymentTarget(VersionTarget target = ApplicationBinary);
    static QOperatingSystemVersion currentRuntime();

private:
    QMacVersion() = default;
    using VersionTuple = QPair<QOperatingSystemVersion, QOperatingSystemVersion>;
    static VersionTuple versionsForImage(const mach_header *machHeader);
    static VersionTuple applicationVersion();
    static VersionTuple libraryVersion();
};

// -------------------------------------------------------------------------

QT_END_NAMESPACE

// @compatibility_alias doesn't work with protocols
#define QNSPanelDelegate QT_MANGLE_NAMESPACE(QNSPanelDelegate)

@protocol QNSPanelDelegate
@required
- (void)onOkClicked;
- (void)onCancelClicked;
@end

@interface QT_MANGLE_NAMESPACE(QNSPanelContentsWrapper) : NSView

@property (nonatomic, readonly) NSButton *okButton;
@property (nonatomic, readonly) NSButton *cancelButton;
@property (nonatomic, readonly) NSView *panelContents; // ARC: unretained, make it weak
@property (nonatomic, assign) NSEdgeInsets panelContentsMargins;

- (instancetype)initWithPanelDelegate:(id<QNSPanelDelegate>)panelDelegate;
- (void)dealloc;

- (NSButton *)createButtonWithTitle:(const char *)title;
- (void)layout;

@end

QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSPanelContentsWrapper);

// -------------------------------------------------------------------------

// QAppleRefCounted expects the retain function to return the object
io_object_t q_IOObjectRetain(io_object_t obj);
// QAppleRefCounted expects the release function to return void
void q_IOObjectRelease(io_object_t obj);

template <typename T>
class QIOType : public QAppleRefCounted<T, io_object_t, q_IOObjectRetain, q_IOObjectRelease>
{
    using QAppleRefCounted<T, io_object_t, q_IOObjectRetain, q_IOObjectRelease>::QAppleRefCounted;
};

// -------------------------------------------------------------------------

// Depending on the ABI of the platform, we may need to use objc_msgSendSuper_stret:
// - http://www.sealiesoftware.com/blog/archive/2008/10/30/objc_explain_objc_msgSend_stret.html
// - https://lists.apple.com/archives/cocoa-dev/2008/Feb/msg02338.html
template <typename T>
struct objc_msgsend_requires_stret
{ static const bool value =
#if defined(Q_PROCESSOR_X86)
    // Any return value larger than two registers on i386/x86_64
    sizeof(T) > sizeof(void*) * 2;
#elif defined(Q_PROCESSOR_ARM_32)
    // Any return value larger than a single register on arm
    sizeof(T) >  sizeof(void*);
#elif defined(Q_PROCESSOR_ARM_64)
    // Stret not used on arm64
    false;
#endif
};

template <>
struct objc_msgsend_requires_stret<void>
{ static const bool value = false; };

template <typename ReturnType, typename... Args>
ReturnType qt_msgSendSuper(id receiver, SEL selector, Args... args)
{
    static_assert(!objc_msgsend_requires_stret<ReturnType>::value,
        "The given return type requires stret on this platform");

    typedef ReturnType (*SuperFn)(objc_super *, SEL, Args...);
    SuperFn superFn = reinterpret_cast<SuperFn>(objc_msgSendSuper);
    objc_super sup = { receiver, [receiver superclass] };
    return superFn(&sup, selector, args...);
}

template <typename ReturnType, typename... Args>
ReturnType qt_msgSendSuper_stret(id receiver, SEL selector, Args... args)
{
    static_assert(objc_msgsend_requires_stret<ReturnType>::value,
        "The given return type does not use stret on this platform");

    typedef void (*SuperStretFn)(ReturnType *, objc_super *, SEL, Args...);
    SuperStretFn superStretFn = reinterpret_cast<SuperStretFn>(objc_msgSendSuper_stret);

    objc_super sup = { receiver, [receiver superclass] };
    ReturnType ret;
    superStretFn(&ret, &sup, selector, args...);
    return ret;
}

template<typename... Args>
class QSendSuperHelper {
public:
    QSendSuperHelper(id receiver, SEL sel, Args... args)
        : m_receiver(receiver), m_selector(sel), m_args(std::make_tuple(args...)), m_sent(false)
    {
    }

    ~QSendSuperHelper()
    {
        if (!m_sent)
            msgSendSuper<void>(m_args);
    }

    template <typename ReturnType>
    operator ReturnType()
    {
#if defined(QT_DEBUG)
        Method method = class_getInstanceMethod(object_getClass(m_receiver), m_selector);
        char returnTypeEncoding[256];
        method_getReturnType(method, returnTypeEncoding, sizeof(returnTypeEncoding));
        NSUInteger alignedReturnTypeSize = 0;
        NSGetSizeAndAlignment(returnTypeEncoding, nullptr, &alignedReturnTypeSize);
        Q_ASSERT(alignedReturnTypeSize == sizeof(ReturnType));
#endif
        m_sent = true;
        return msgSendSuper<ReturnType>(m_args);
    }

private:
    template <typename ReturnType, bool V>
    using if_requires_stret = typename std::enable_if<objc_msgsend_requires_stret<ReturnType>::value == V, ReturnType>::type;

    template <typename ReturnType, int... Is>
    if_requires_stret<ReturnType, false> msgSendSuper(std::tuple<Args...>& args, QtPrivate::IndexesList<Is...>)
    {
        return qt_msgSendSuper<ReturnType>(m_receiver, m_selector, std::get<Is>(args)...);
    }

    template <typename ReturnType, int... Is>
    if_requires_stret<ReturnType, true> msgSendSuper(std::tuple<Args...>& args, QtPrivate::IndexesList<Is...>)
    {
        return qt_msgSendSuper_stret<ReturnType>(m_receiver, m_selector, std::get<Is>(args)...);
    }

    template <typename ReturnType>
    ReturnType msgSendSuper(std::tuple<Args...>& args)
    {
        return msgSendSuper<ReturnType>(args, QtPrivate::makeIndexSequence<sizeof...(Args)>{});
    }

    id m_receiver;
    SEL m_selector;
    std::tuple<Args...> m_args;
    bool m_sent;
};

template<typename... Args>
QSendSuperHelper<Args...> qt_objcDynamicSuperHelper(id receiver, SEL selector, Args... args)
{
    return QSendSuperHelper<Args...>(receiver, selector, args...);
}

// Same as calling super, but the super_class field resolved at runtime instead of compile time
#define qt_objcDynamicSuper(...) qt_objcDynamicSuperHelper(self, _cmd, ##__VA_ARGS__)

#endif //QCOCOAHELPERS_H