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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmtheme.h"
#include <QtCore/qvariant.h>
#include <QFontDatabase>
#include <QList>
#include <qpa/qwindowsysteminterface.h>
#include <qpalette.h>
#include <private/qstdweb_p.h>
#include <emscripten.h>
#include <emscripten/bind.h>
#include <emscripten/val.h>
Q_GUI_EXPORT QPalette qt_fusionPalette();
Qt::ColorScheme QWasmTheme::s_autoColorScheme = Qt::ColorScheme::Unknown;
bool QWasmTheme::s_autoPaletteIsDirty = false;
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
QWasmTheme::QWasmTheme()
{
if (emscripten::val::global("window").call<emscripten::val>(
"matchMedia",
std::string("(prefers-color-scheme:dark)"))["matches"].as<bool>())
s_autoColorScheme = Qt::ColorScheme::Dark;
else
s_autoColorScheme = Qt::ColorScheme::Light;
for (auto family : QFontDatabase::families())
if (QFontDatabase::isFixedPitch(family))
fixedFont = new QFont(family);
m_palette = std::make_unique<QPalette>();
m_paletteIsDirty = true; // Force update later
const auto callback = [=](emscripten::val event) { QWasmTheme::onColorSchemeChange(event); };
const emscripten::val window = emscripten::val::global("window");
if (!window.isUndefined()) {
const emscripten::val matchMedia = window.call<emscripten::val>("matchMedia", emscripten::val("(prefers-color-scheme: dark)"));
if (!matchMedia.isUndefined()) {
static auto changeEvent =
std::make_unique<qstdweb::EventCallback>(matchMedia, "change", callback);
}
}
}
QWasmTheme::~QWasmTheme()
{
if (fixedFont)
delete fixedFont;
}
const QPalette *QWasmTheme::palette(Palette type) const
{
if (type == SystemPalette) {
if (m_paletteIsDirty || s_autoPaletteIsDirty) {
m_paletteIsDirty = false;
s_autoPaletteIsDirty = false;
*m_palette = qt_fusionPalette();
}
return m_palette.get();
}
return nullptr;
}
Qt::ColorScheme QWasmTheme::colorScheme() const
{
if (m_colorScheme != Qt::ColorScheme::Unknown)
return m_colorScheme;
return s_autoColorScheme;
}
void QWasmTheme::requestColorScheme(Qt::ColorScheme scheme)
{
if (m_colorScheme != scheme) {
m_paletteIsDirty = true;
m_colorScheme = scheme;
QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>();
}
}
QVariant QWasmTheme::themeHint(ThemeHint hint) const
{
if (hint == QPlatformTheme::StyleNames)
return QVariant(QStringList() << "Fusion"_L1);
if (hint == QPlatformTheme::UiEffects)
return QVariant(int(HoverEffect));
return QPlatformTheme::themeHint(hint);
}
const QFont *QWasmTheme::font(Font type) const
{
if (type == QPlatformTheme::FixedFont) {
return fixedFont;
}
return nullptr;
}
void QWasmTheme::onColorSchemeChange(emscripten::val event)
{
const emscripten::val matches = event["matches"];
if (!matches.isUndefined()) {
const auto oldAutoColorScheme = s_autoColorScheme;
if (matches.as<int>())
s_autoColorScheme = Qt::ColorScheme::Dark;
else
s_autoColorScheme = Qt::ColorScheme::Light;
if (oldAutoColorScheme != s_autoColorScheme) {
s_autoPaletteIsDirty = true;
QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>();
}
}
}
QT_END_NAMESPACE
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