summaryrefslogtreecommitdiffstats
path: root/src/plugins/platforms/wasm/qwasmclipboard.cpp
blob: f02c2c6ccb820ed4edf7d6139ad618b665360b0b (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
/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) 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.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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qwasmclipboard.h"
#include "qwasmwindow.h"
#include "qwasmstring.h"

#include <emscripten.h>
#include <emscripten/html5.h>
#include <emscripten/bind.h>

#include <QCoreApplication>
#include <qpa/qwindowsysteminterface.h>

using namespace emscripten;

// there has got to be a better way...
static QString g_clipboardText;
static QString g_clipboardFormat;

static val getClipboardData()
{
    return QWasmString::fromQString(g_clipboardText);
}

static val getClipboardFormat()
{
    return QWasmString::fromQString(g_clipboardFormat);
}

static void pasteClipboardData(emscripten::val format, emscripten::val dataPtr)
{
    QString formatString = QWasmString::toQString(format);
    QByteArray dataArray =  QByteArray::fromStdString(dataPtr.as<std::string>());
    QMimeData *mMimeData = new QMimeData;
    mMimeData->setData(formatString, dataArray);
    QWasmClipboard::qWasmClipboardPaste(mMimeData);
}

static void qClipboardPromiseResolve(emscripten::val something)
{
    pasteClipboardData(emscripten::val("text/plain"), something);
}

static void qClipboardCutTo(val event)
{
    if (!QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi) {
        // Send synthetic Ctrl+X to make the app cut data to Qt's clipboard
        QWindowSystemInterface::handleKeyEvent<QWindowSystemInterface::SynchronousDelivery>(
            0, QEvent::KeyPress, Qt::Key_X,  Qt::ControlModifier, "X");
    }

    val module = val::global("Module");
    val clipdata = module.call<val>("qtGetClipboardData");
    val clipFormat = module.call<val>("qtGetClipboardFormat");
    event["clipboardData"].call<void>("setData", clipFormat, clipdata);
    event.call<void>("preventDefault");
}

static void qClipboardCopyTo(val event)
{
    if (!QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi) {
        // Send synthetic Ctrl+C to make the app copy data to Qt's clipboard
        QWindowSystemInterface::handleKeyEvent<QWindowSystemInterface::SynchronousDelivery>(
            0, QEvent::KeyPress, Qt::Key_C,  Qt::ControlModifier, "C");
    }

    val module = val::global("Module");
    val clipdata = module.call<val>("qtGetClipboardData");
    val clipFormat = module.call<val>("qtGetClipboardFormat");
    event["clipboardData"].call<void>("setData", clipFormat, clipdata);
    event.call<void>("preventDefault");
}

static void qClipboardPasteTo(val event)
{
    bool hasClipboardApi = QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi;
    val clipdata = hasClipboardApi ?
        val::global("Module").call<val>("qtGetClipboardData") :
        event["clipboardData"].call<val>("getData", val("text"));

    const QString qstr = QWasmString::toQString(clipdata);
    if (qstr.length() > 0) {
        QMimeData *mMimeData = new QMimeData;
        mMimeData->setText(qstr);
        QWasmClipboard::qWasmClipboardPaste(mMimeData);
    }
}

EMSCRIPTEN_BINDINGS(qtClipboardModule) {
    function("qtGetClipboardData", &getClipboardData);
    function("qtGetClipboardFormat", &getClipboardFormat);
    function("qtPasteClipboardData", &pasteClipboardData);
    function("qtClipboardPromiseResolve", &qClipboardPromiseResolve);
    function("qtClipboardCutTo", &qClipboardCutTo);
    function("qtClipboardCopyTo", &qClipboardCopyTo);
    function("qtClipboardPasteTo", &qClipboardPasteTo);
}

QWasmClipboard::QWasmClipboard()
{
    val clipboard = val::global("navigator")["clipboard"];
    hasClipboardApi = (!clipboard.isUndefined() && !clipboard["readText"].isUndefined());

    initClipboardEvents();
}

QWasmClipboard::~QWasmClipboard()
{
    g_clipboardText.clear();
    g_clipboardFormat.clear();
}

QMimeData* QWasmClipboard::mimeData(QClipboard::Mode mode)
{
    if (mode != QClipboard::Clipboard)
        return nullptr;

    return QPlatformClipboard::mimeData(mode);
}

void QWasmClipboard::setMimeData(QMimeData* mimeData, QClipboard::Mode mode)
{
    if (mimeData->hasText()) {
        g_clipboardFormat = mimeData->formats().at(0);
        g_clipboardText = mimeData->text();
    } else if (mimeData->hasHtml()) {
        g_clipboardFormat = mimeData->formats().at(0);
        g_clipboardText = mimeData->html();
    }

    QPlatformClipboard::setMimeData(mimeData, mode);
}

bool QWasmClipboard::supportsMode(QClipboard::Mode mode) const
{
    return mode == QClipboard::Clipboard;
}

bool QWasmClipboard::ownsMode(QClipboard::Mode mode) const
{
    Q_UNUSED(mode);
    return false;
}

void QWasmClipboard::qWasmClipboardPaste(QMimeData *mData)
{
    QWasmIntegration::get()->clipboard()->setMimeData(mData, QClipboard::Clipboard);

    QWindowSystemInterface::handleKeyEvent<QWindowSystemInterface::SynchronousDelivery>(
                0, QEvent::KeyPress, Qt::Key_V,  Qt::ControlModifier, "V");
}

void QWasmClipboard::initClipboardEvents()
{
    if (!hasClipboardApi)
        return;

    val permissions = val::global("navigator")["permissions"];
    val readPermissionsMap = val::object();
    readPermissionsMap.set("name", val("clipboard-read"));
    permissions.call<val>("query", readPermissionsMap);

    val writePermissionsMap = val::object();
    writePermissionsMap.set("name", val("clipboard-write"));
    permissions.call<val>("query", writePermissionsMap);
}

void QWasmClipboard::installEventHandlers(const QString &canvasId)
{
    if (hasClipboardApi)
        return;

    // Fallback path for browsers which do not support direct clipboard access
    val document = val::global("document");
    val canvas = document.call<val>("getElementById", QWasmString::fromQString(canvasId));

    canvas.call<void>("addEventListener", val("cut"),
                      val::module_property("qtClipboardCutTo"));
    canvas.call<void>("addEventListener", val("copy"),
                      val::module_property("qtClipboardCopyTo"));
    canvas.call<void>("addEventListener", val("paste"),
                      val::module_property("qtClipboardPasteTo"));
}

void QWasmClipboard::readTextFromClipboard()
{
    if (QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi) {
        val navigator = val::global("navigator");
        val textPromise = navigator["clipboard"].call<val>("readText");
        val readTextResolve = val::global("Module")["qtClipboardPromiseResolve"];
        textPromise.call<val>("then", readTextResolve);
    }
}

void QWasmClipboard::writeTextToClipboard()
{
    if (QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi) {
        val module = val::global("Module");
        val txt = module.call<val>("qtGetClipboardData");
        val format =  module.call<val>("qtGetClipboardFormat");
        val navigator = val::global("navigator");
        navigator["clipboard"].call<void>("writeText", txt);
    }
}