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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QWASMEVENT_H
#define QWASMEVENT_H
#include "qwasmplatform.h"
#include <QtCore/qglobal.h>
#include <QtCore/qnamespace.h>
#include <QtGui/qevent.h>
#include <QPoint>
#include <emscripten/html5.h>
#include <emscripten/val.h>
QT_BEGIN_NAMESPACE
enum class EventType {
PointerDown,
PointerMove,
PointerUp,
PointerEnter,
PointerLeave,
};
enum class PointerType {
Mouse,
Other,
};
enum class WindowArea {
NonClient,
Client,
};
namespace KeyboardModifier {
namespace internal
{
// Check for the existence of shiftKey, ctrlKey, altKey and metaKey in a type.
// Based on that, we can safely assume we are dealing with an emscripten event type.
template<typename T>
struct IsEmscriptenEvent
{
template<typename U, EM_BOOL U::*, EM_BOOL U::*, EM_BOOL U::*, EM_BOOL U::*>
struct SFINAE {};
template<typename U> static char Test(
SFINAE<U, &U::shiftKey, &U::ctrlKey, &U::altKey, &U::metaKey>*);
template<typename U> static int Test(...);
static const bool value = sizeof(Test<T>(0)) == sizeof(char);
};
template<class T, typename Enable = void>
struct Helper;
template<class T>
struct Helper<T, std::enable_if_t<IsEmscriptenEvent<T>::value>>
{
static QFlags<Qt::KeyboardModifier> getModifierForEvent(const T& event) {
QFlags<Qt::KeyboardModifier> keyModifier = Qt::NoModifier;
if (event.shiftKey)
keyModifier |= Qt::ShiftModifier;
if (event.ctrlKey)
keyModifier |= platform() == Platform::MacOS ? Qt::MetaModifier : Qt::ControlModifier;
if (event.altKey)
keyModifier |= Qt::AltModifier;
if (event.metaKey)
keyModifier |= platform() == Platform::MacOS ? Qt::ControlModifier : Qt::MetaModifier;
return keyModifier;
}
};
template<>
struct Helper<emscripten::val>
{
static QFlags<Qt::KeyboardModifier> getModifierForEvent(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 internal
template <typename Event>
QFlags<Qt::KeyboardModifier> getForEvent(const Event& event)
{
return internal::Helper<Event>::getModifierForEvent(event);
}
template <>
QFlags<Qt::KeyboardModifier> getForEvent<EmscriptenKeyboardEvent>(
const EmscriptenKeyboardEvent& event);
} // namespace KeyboardModifier
struct Q_CORE_EXPORT Event
{
EventType type;
};
struct Q_CORE_EXPORT MouseEvent : public Event
{
QPoint point;
Qt::MouseButton mouseButton;
Qt::MouseButtons mouseButtons;
QFlags<Qt::KeyboardModifier> modifiers;
static constexpr Qt::MouseButton buttonFromWeb(int webButton) {
switch (webButton) {
case 0:
return Qt::LeftButton;
case 1:
return Qt::MiddleButton;
case 2:
return Qt::RightButton;
default:
return Qt::NoButton;
}
}
static constexpr Qt::MouseButtons buttonsFromWeb(unsigned short webButtons) {
// Coincidentally, Qt and web bitfields match.
return Qt::MouseButtons::fromInt(webButtons);
}
static constexpr QEvent::Type mouseEventTypeFromEventType(
EventType eventType, WindowArea windowArea) {
switch (eventType) {
case EventType::PointerDown :
return windowArea == WindowArea::Client ?
QEvent::MouseButtonPress : QEvent::NonClientAreaMouseButtonPress;
case EventType::PointerUp :
return windowArea == WindowArea::Client ?
QEvent::MouseButtonRelease : QEvent::NonClientAreaMouseButtonRelease;
case EventType::PointerMove :
return windowArea == WindowArea::Client ?
QEvent::MouseMove : QEvent::NonClientAreaMouseMove;
default:
return QEvent::None;
}
}
};
struct Q_CORE_EXPORT PointerEvent : public MouseEvent
{
static std::optional<PointerEvent> fromWeb(emscripten::val webEvent);
PointerType pointerType;
int pointerId;
};
QT_END_NAMESPACE
#endif // QWASMEVENT_H
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