1 files changed, 338 insertions, 0 deletions
diff --git a/src/plugins/platforms/wasm/qwasmevent.cpp b/src/plugins/platforms/wasm/qwasmevent.cpp
new file mode 100644
index 0000000000..c1d6ce3a2a
--- /dev/null
+++ b/src/plugins/platforms/wasm/qwasmevent.cpp
@@ -0,0 +1,338 @@
+// 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())) {
+        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));
+}
+} // namespace
+
+namespace KeyboardModifier
+{
+template <>
+QFlags<Qt::KeyboardModifier> getForEvent<EmscriptenKeyboardEvent>(
+    const EmscriptenKeyboardEvent& event)
+{
+    return internal::Helper<EmscriptenKeyboardEvent>::getModifierForEvent(event) |
+        (event.location == DOM_KEY_LOCATION_NUMPAD ? Qt::KeypadModifier : Qt::NoModifier);
+}
+}  // namespace KeyboardModifier
+
+Event::Event(EventType type, emscripten::val webEvent)
+    : webEvent(webEvent), type(type)
+{
+}
+
+Event::~Event() = default;
+
+Event::Event(const Event &other) = default;
+
+Event::Event(Event &&other) = default;
+
+Event &Event::operator=(const Event &other) = default;
+
+Event &Event::operator=(Event &&other) = default;
+
+KeyEvent::KeyEvent(EventType type, emscripten::val event) : Event(type, event)
+{
+    const auto code = event["code"].as<std::string>();
+    const auto webKey = event["key"].as<std::string>();
+    deadKey = isDeadKeyEvent(webKey.c_str());
+
+    modifiers = KeyboardModifier::getForEvent(event);
+    key = webKeyToQtKey(code, webKey, deadKey, modifiers);
+
+    text = QString::fromUtf8(webKey);
+    if (text.size() > 1)
+        text.clear();
+
+    if (key == Qt::Key_Tab)
+        text = "\t";
+}
+
+KeyEvent::~KeyEvent() = default;
+
+KeyEvent::KeyEvent(const KeyEvent &other) = default;
+
+KeyEvent::KeyEvent(KeyEvent &&other) = default;
+
+KeyEvent &KeyEvent::operator=(const KeyEvent &other) = default;
+
+KeyEvent &KeyEvent::operator=(KeyEvent &&other) = default;
+
+std::optional<KeyEvent> KeyEvent::fromWebWithDeadKeyTranslation(emscripten::val event,
+                                                                QWasmDeadKeySupport *deadKeySupport)
+{
+    const auto eventType = ([&event]() -> std::optional<EventType> {
+        const auto eventTypeString = event["type"].as<std::string>();
+
+        if (eventTypeString == "keydown")
+            return EventType::KeyDown;
+        else if (eventTypeString == "keyup")
+            return EventType::KeyUp;
+        return std::nullopt;
+    })();
+    if (!eventType)
+        return std::nullopt;
+
+    auto result = KeyEvent(*eventType, event);
+    deadKeySupport->applyDeadKeyTranslations(&result);
+
+    return result;
+}
+
+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 = KeyboardModifier::getForEvent(event);
+}
+
+MouseEvent::~MouseEvent() = default;
+
+MouseEvent::MouseEvent(const MouseEvent &other) = default;
+
+MouseEvent::MouseEvent(MouseEvent &&other) = default;
+
+MouseEvent &MouseEvent::operator=(const MouseEvent &other) = default;
+
+MouseEvent &MouseEvent::operator=(MouseEvent &&other) = default;
+
+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>();
+}
+
+PointerEvent::~PointerEvent() = default;
+
+PointerEvent::PointerEvent(const PointerEvent &other) = default;
+
+PointerEvent::PointerEvent(PointerEvent &&other) = default;
+
+PointerEvent &PointerEvent::operator=(const PointerEvent &other) = default;
+
+PointerEvent &PointerEvent::operator=(PointerEvent &&other) = default;
+
+std::optional<PointerEvent> PointerEvent::fromWeb(emscripten::val event)
+{
+    const auto eventType = ([&event]() -> std::optional<EventType> {
+        const auto eventTypeString = event["type"].as<std::string>();
+
+        if (eventTypeString == "pointermove")
+            return EventType::PointerMove;
+        else if (eventTypeString == "pointerup")
+            return EventType::PointerUp;
+        else if (eventTypeString == "pointerdown")
+            return EventType::PointerDown;
+        else if (eventTypeString == "pointerenter")
+            return EventType::PointerEnter;
+        else if (eventTypeString == "pointerleave")
+            return EventType::PointerLeave;
+        return std::nullopt;
+    })();
+    if (!eventType)
+        return std::nullopt;
+
+    return PointerEvent(*eventType, event);
+}
+
+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;
+    })();
+}
+
+DragEvent::~DragEvent() = default;
+
+DragEvent::DragEvent(const DragEvent &other) = default;
+
+DragEvent::DragEvent(DragEvent &&other) = default;
+
+DragEvent &DragEvent::operator=(const DragEvent &other) = default;
+
+DragEvent &DragEvent::operator=(DragEvent &&other) = default;
+
+std::optional<DragEvent> DragEvent::fromWeb(emscripten::val event, QWindow *targetWindow)
+{
+    const auto eventType = ([&event]() -> std::optional<EventType> {
+        const auto eventTypeString = event["type"].as<std::string>();
+
+        if (eventTypeString == "dragend")
+            return EventType::DragEnd;
+        if (eventTypeString == "dragover")
+            return EventType::DragOver;
+        if (eventTypeString == "dragstart")
+            return EventType::DragStart;
+        if (eventTypeString == "drop")
+            return EventType::Drop;
+        return std::nullopt;
+    })();
+    if (!eventType)
+        return std::nullopt;
+    return DragEvent(*eventType, event, targetWindow);
+}
+
+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>();
+}
+
+WheelEvent::~WheelEvent() = default;
+
+WheelEvent::WheelEvent(const WheelEvent &other) = default;
+
+WheelEvent::WheelEvent(WheelEvent &&other) = default;
+
+WheelEvent &WheelEvent::operator=(const WheelEvent &other) = default;
+
+WheelEvent &WheelEvent::operator=(WheelEvent &&other) = default;
+
+std::optional<WheelEvent> WheelEvent::fromWeb(emscripten::val event)
+{
+    const auto eventType = ([&event]() -> std::optional<EventType> {
+        const auto eventTypeString = event["type"].as<std::string>();
+
+        if (eventTypeString == "wheel")
+            return EventType::Wheel;
+        return std::nullopt;
+    })();
+    if (!eventType)
+        return std::nullopt;
+    return WheelEvent(*eventType, event);
+}
+
+QT_END_NAMESPACE