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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmevent.h"
#include "qwasmkeytranslator.h"
#include <QtCore/private/qmakearray_p.h>
#include <QtCore/private/qstringiterator_p.h>
#include <QtCore/qregularexpression.h>
QT_BEGIN_NAMESPACE
namespace {
constexpr std::string_view WebDeadKeyValue = "Dead";
bool isDeadKeyEvent(const char *key)
{
return qstrncmp(key, WebDeadKeyValue.data(), WebDeadKeyValue.size()) == 0;
}
Qt::Key getKeyFromCode(const std::string &code)
{
if (auto mapping = QWasmKeyTranslator::mapWebKeyTextToQtKey(code.c_str()))
return *mapping;
static QRegularExpression regex(QString(QStringLiteral(R"re((?:Key|Digit)(\w))re")));
const auto codeQString = QString::fromStdString(code);
const auto match = regex.match(codeQString);
if (!match.hasMatch())
return Qt::Key_unknown;
constexpr size_t CharacterIndex = 1;
return static_cast<Qt::Key>(match.capturedView(CharacterIndex).at(0).toLatin1());
}
Qt::Key webKeyToQtKey(const std::string &code, const std::string &key, bool isDeadKey,
QFlags<Qt::KeyboardModifier> modifiers)
{
if (isDeadKey) {
auto mapped = getKeyFromCode(code);
switch (mapped) {
case Qt::Key_U:
return Qt::Key_Dead_Diaeresis;
case Qt::Key_E:
return Qt::Key_Dead_Acute;
case Qt::Key_I:
return Qt::Key_Dead_Circumflex;
case Qt::Key_N:
return Qt::Key_Dead_Tilde;
case Qt::Key_QuoteLeft:
return modifiers.testFlag(Qt::ShiftModifier) ? Qt::Key_Dead_Tilde : Qt::Key_Dead_Grave;
case Qt::Key_6:
return Qt::Key_Dead_Circumflex;
case Qt::Key_Apostrophe:
return modifiers.testFlag(Qt::ShiftModifier) ? Qt::Key_Dead_Diaeresis
: Qt::Key_Dead_Acute;
case Qt::Key_AsciiTilde:
return Qt::Key_Dead_Tilde;
default:
return Qt::Key_unknown;
}
} else if (auto mapping = QWasmKeyTranslator::mapWebKeyTextToQtKey(key.c_str())) {
if (modifiers.testFlag(Qt::ShiftModifier) && (*mapping == Qt::Key::Key_Tab))
*mapping = Qt::Key::Key_Backtab;
return *mapping;
}
// cast to unicode key
QString str = QString::fromUtf8(key.c_str()).toUpper();
if (str.length() > 1)
return Qt::Key_unknown;
QStringIterator i(str);
return static_cast<Qt::Key>(i.next(0));
}
QFlags<Qt::KeyboardModifier> getKeyboardModifiers(const emscripten::val &event)
{
QFlags<Qt::KeyboardModifier> keyModifier = Qt::NoModifier;
if (event["shiftKey"].as<bool>())
keyModifier |= Qt::ShiftModifier;
if (event["ctrlKey"].as<bool>())
keyModifier |= platform() == Platform::MacOS ? Qt::MetaModifier : Qt::ControlModifier;
if (event["altKey"].as<bool>())
keyModifier |= Qt::AltModifier;
if (event["metaKey"].as<bool>())
keyModifier |= platform() == Platform::MacOS ? Qt::ControlModifier : Qt::MetaModifier;
if (event["constructor"]["name"].as<std::string>() == "KeyboardEvent" &&
event["location"].as<unsigned int>() == DOM_KEY_LOCATION_NUMPAD) {
keyModifier |= Qt::KeypadModifier;
}
return keyModifier;
}
} // namespace
Event::Event(EventType type, emscripten::val webEvent)
: webEvent(webEvent), type(type)
{
}
bool Event::isTargetedForQtElement() const
{
// Check event target via composedPath, which returns the true path even
// if the browser retargets the event for Qt's shadow DOM container. This
// is needed to avoid capturing the pointer in cases where foreign html
// elements are embedded inside Qt's shadow DOM.
emscripten::val path = webEvent.call<emscripten::val>("composedPath");
QString topElementClassName = QString::fromEcmaString(path[0]["className"]);
return topElementClassName.startsWith("qt-"); // .e.g. qt-window-canvas
}
KeyEvent::KeyEvent(EventType type, emscripten::val event, QWasmDeadKeySupport *deadKeySupport) : Event(type, event)
{
const auto code = event["code"].as<std::string>();
const auto webKey = event["key"].as<std::string>();
deadKey = isDeadKeyEvent(webKey.c_str());
autoRepeat = event["repeat"].as<bool>();
modifiers = getKeyboardModifiers(event);
key = webKeyToQtKey(code, webKey, deadKey, modifiers);
text = QString::fromUtf8(webKey);
// Alt + keypad number -> insert utf-8 character
// The individual numbers shall not be inserted but
// on some platforms they are if numlock is
// activated
if ((modifiers & Qt::AltModifier) && (modifiers & Qt::KeypadModifier))
text.clear();
if (text.size() > 1)
text.clear();
if (key == Qt::Key_Tab)
text = "\t";
deadKeySupport->applyDeadKeyTranslations(this);
}
MouseEvent::MouseEvent(EventType type, emscripten::val event) : Event(type, event)
{
mouseButton = MouseEvent::buttonFromWeb(event["button"].as<int>());
mouseButtons = MouseEvent::buttonsFromWeb(event["buttons"].as<unsigned short>());
// The current button state (event.buttons) may be out of sync for some PointerDown
// events where the "down" state is very brief, for example taps on Apple trackpads.
// Qt expects that the current button state is in sync with the event, so we sync
// it up here.
if (type == EventType::PointerDown)
mouseButtons |= mouseButton;
localPoint = QPointF(event["offsetX"].as<qreal>(), event["offsetY"].as<qreal>());
pointInPage = QPointF(event["pageX"].as<qreal>(), event["pageY"].as<qreal>());
pointInViewport = QPointF(event["clientX"].as<qreal>(), event["clientY"].as<qreal>());
modifiers = getKeyboardModifiers(event);
}
PointerEvent::PointerEvent(EventType type, emscripten::val event) : MouseEvent(type, event)
{
pointerId = event["pointerId"].as<int>();
pointerType = ([type = event["pointerType"].as<std::string>()]() {
if (type == "mouse")
return PointerType::Mouse;
if (type == "touch")
return PointerType::Touch;
if (type == "pen")
return PointerType::Pen;
return PointerType::Other;
})();
width = event["width"].as<qreal>();
height = event["height"].as<qreal>();
pressure = event["pressure"].as<qreal>();
tiltX = event["tiltX"].as<qreal>();
tiltY = event["tiltY"].as<qreal>();
tangentialPressure = event["tangentialPressure"].as<qreal>();
twist = event["twist"].as<qreal>();
isPrimary = event["isPrimary"].as<bool>();
}
DragEvent::DragEvent(EventType type, emscripten::val event, QWindow *window)
: MouseEvent(type, event), dataTransfer(event["dataTransfer"]), targetWindow(window)
{
dropAction = ([event]() {
const std::string effect = event["dataTransfer"]["dropEffect"].as<std::string>();
if (effect == "copy")
return Qt::CopyAction;
else if (effect == "move")
return Qt::MoveAction;
else if (effect == "link")
return Qt::LinkAction;
return Qt::IgnoreAction;
})();
}
void DragEvent::cancelDragStart()
{
Q_ASSERT_X(type == EventType::DragStart, Q_FUNC_INFO, "Only supported for DragStart");
webEvent.call<void>("preventDefault");
}
void DragEvent::acceptDragOver()
{
Q_ASSERT_X(type == EventType::DragOver, Q_FUNC_INFO, "Only supported for DragOver");
webEvent.call<void>("preventDefault");
}
void DragEvent::acceptDrop()
{
Q_ASSERT_X(type == EventType::Drop, Q_FUNC_INFO, "Only supported for Drop");
webEvent.call<void>("preventDefault");
}
WheelEvent::WheelEvent(EventType type, emscripten::val event) : MouseEvent(type, event)
{
deltaMode = ([event]() {
const int deltaMode = event["deltaMode"].as<int>();
const auto jsWheelEventType = emscripten::val::global("WheelEvent");
if (deltaMode == jsWheelEventType["DOM_DELTA_PIXEL"].as<int>())
return DeltaMode::Pixel;
else if (deltaMode == jsWheelEventType["DOM_DELTA_LINE"].as<int>())
return DeltaMode::Line;
return DeltaMode::Page;
})();
delta = QPointF(event["deltaX"].as<qreal>(), event["deltaY"].as<qreal>());
webkitDirectionInvertedFromDevice = event["webkitDirectionInvertedFromDevice"].as<bool>();
}
QT_END_NAMESPACE
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