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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QWASMTHEME_H
#define QWASMTHEME_H
#include <qpa/qplatformtheme.h>
#include <QtGui/QFont>
#include <memory>
#include <private/qstdweb_p.h>
QT_BEGIN_NAMESPACE
class QWasmEventTranslator;
class QWasmFontDatabase;
class QWasmWindow;
class QWasmEventDispatcher;
class QWasmScreen;
class QWasmCompositor;
class QWasmBackingStore;
// this reflects @media/prefers-contrast
constexpr auto colorSchemePreferenceDark = "(prefers-color-scheme: dark)";
constexpr auto contrastPreferenceNoPreference = "(prefers-contrast: no-preference)";
constexpr auto contrastPreferenceMore = "(prefers-contrast: more)";
constexpr auto contrastPreferenceLess = "(prefers-contrast: less)";
constexpr auto contrastPreferenceCustom = "(prefers-contrast: custom)";
template <typename MediaName, typename CallbackFn, typename Container>
void registerCallbacks(std::initializer_list<MediaName> mediaNames, CallbackFn callback, Container &callbacksContainer)
{
emscripten::val window = emscripten::val::global("window");
if (!window.isUndefined()) {
for (auto &&mediaName : mediaNames) {
auto media = window.call<emscripten::val>("matchMedia", emscripten::val(mediaName));
if constexpr (std::is_same_v<Container, std::vector<QWasmEventHandler>>) {
callbacksContainer.emplace_back(media, "change", callback);
} else {
Q_ASSERT(mediaNames.size() == 1);
callbacksContainer = QWasmEventHandler(media, "change", callback);
}
}
}
}
class QWasmTheme : public QPlatformTheme
{
public:
QWasmTheme();
~QWasmTheme();
const QPalette *palette(Palette type = SystemPalette) const override;
Qt::ColorScheme colorScheme() const override;
void requestColorScheme(Qt::ColorScheme scheme) override;
Qt::ContrastPreference contrastPreference() const override;
QVariant themeHint(ThemeHint hint) const override;
const QFont *font(Font type) const override;
QFont *fixedFont = nullptr;
void onColorSchemeChange();
void onContrastPreferenceChange();
private:
Qt::ColorScheme m_colorScheme = Qt::ColorScheme::Unknown;
QWasmEventHandler m_colorSchemeChangeCallback;
std::unique_ptr<QPalette> m_palette;
mutable bool m_paletteIsDirty = false;
Qt::ContrastPreference m_contrastPreference;
std::vector<QWasmEventHandler> m_contrastPreferenceChangeCallbacks;
};
QT_END_NAMESPACE
#endif // QWASMTHEME_H
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