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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 <qloggingcategory.h>
#include <qpa/qwindowsysteminterface.h>
#include <qpalette.h>
#include <emscripten.h>
#include <emscripten/bind.h>
#include <emscripten/val.h>
Q_GUI_EXPORT QPalette qt_fusionPalette();
QT_BEGIN_NAMESPACE
Q_STATIC_LOGGING_CATEGORY(lcQpaThemeWasm, "qt.qpa.theme.wasm")
namespace {
bool matchMedia(std::string mediaQueryString)
{
return emscripten::val::global("window")
.call<emscripten::val>("matchMedia", mediaQueryString)["matches"]
.as<bool>();
}
Qt::ColorScheme getColorSchemeFromMedia()
{
if (matchMedia(colorSchemePreferenceDark)) {
return Qt::ColorScheme::Dark;
} else {
return Qt::ColorScheme::Light;
}
}
Qt::ContrastPreference getContrastPreferenceFromMedia()
{
if (matchMedia(contrastPreferenceMore)) {
return Qt::ContrastPreference::HighContrast;
} else {
return Qt::ContrastPreference::NoPreference;
}
}
} // namespace
using namespace Qt::StringLiterals;
QWasmTheme::QWasmTheme()
{
m_colorScheme = getColorSchemeFromMedia();
qCDebug(lcQpaThemeWasm) << "Initializing Wasm theme. Color scheme: " << m_colorScheme;
m_contrastPreference = getContrastPreferenceFromMedia();
qCDebug(lcQpaThemeWasm) << "Initializing Wasm theme. Contrast preference: " << m_contrastPreference;
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
registerCallbacks(
{ colorSchemePreferenceDark },
[this](emscripten::val) { QWasmTheme::onColorSchemeChange(); },
m_colorSchemeChangeCallback);
registerCallbacks(
{ contrastPreferenceNoPreference, contrastPreferenceMore, contrastPreferenceLess,
contrastPreferenceCustom },
[this](emscripten::val) { QWasmTheme::onContrastPreferenceChange(); },
m_contrastPreferenceChangeCallbacks);
}
QWasmTheme::~QWasmTheme()
{
if (fixedFont)
delete fixedFont;
}
const QPalette *QWasmTheme::palette(Palette type) const
{
if (type == SystemPalette) {
if (m_paletteIsDirty) {
m_paletteIsDirty = false;
*m_palette = qt_fusionPalette();
}
return m_palette.get();
}
return nullptr;
}
Qt::ColorScheme QWasmTheme::colorScheme() const
{
return m_colorScheme;
}
void QWasmTheme::requestColorScheme(Qt::ColorScheme scheme)
{
if (m_colorScheme != scheme) {
m_paletteIsDirty = true;
m_colorScheme = scheme;
QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>();
}
}
Qt::ContrastPreference QWasmTheme::contrastPreference() const
{
return m_contrastPreference;
}
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()
{
auto colorScheme = getColorSchemeFromMedia();
if (m_colorScheme != colorScheme) {
qCDebug(lcQpaThemeWasm) << "Color scheme changed to " << colorScheme;
m_colorScheme = colorScheme;
m_paletteIsDirty = true;
QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>();
}
}
void QWasmTheme::onContrastPreferenceChange()
{
auto contrastPreference = getContrastPreferenceFromMedia();
if (m_contrastPreference != contrastPreference) {
qCDebug(lcQpaThemeWasm) << "Contrast preference changed to " << contrastPreference;
m_contrastPreference = contrastPreference;
m_paletteIsDirty = true;
QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>();
}
}
QT_END_NAMESPACE
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