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/*
This file is part of the KDE project
SPDX-FileCopyrightText: 2022 Felix Ernst <[email protected]>
SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#include "backgroundcolorhelper.h"
#include <KColorScheme>
#include <QGuiApplication>
#include <QPalette>
#include <QtGlobal>
#include <QWidget>
BackgroundColorHelper *BackgroundColorHelper::instance()
{
if (!s_instance) {
s_instance = new BackgroundColorHelper;
}
return s_instance;
}
void setBackgroundColorForWidget(QWidget *widget, QColor color)
{
QPalette palette;
palette.setBrush(QPalette::Active, QPalette::Window, color);
palette.setBrush(QPalette::Inactive, QPalette::Window, color);
palette.setBrush(QPalette::Disabled, QPalette::Window, color);
widget->setAutoFillBackground(true);
widget->setPalette(palette);
}
void BackgroundColorHelper::controlBackgroundColor(QWidget *widget)
{
setBackgroundColorForWidget(widget, m_backgroundColor);
Q_ASSERT_X(std::find(m_colorControlledWidgets.begin(), m_colorControlledWidgets.end(), widget) == m_colorControlledWidgets.end(), "controlBackgroundColor",
"Duplicate insertion is not necessary because the background color should already automatically update itself on paletteChanged");
m_colorControlledWidgets.emplace_back(widget);
}
BackgroundColorHelper::BackgroundColorHelper()
{
updateBackgroundColor();
QObject::connect(qApp, &QGuiApplication::paletteChanged, [=](){ slotPaletteChanged(); });
}
void BackgroundColorHelper::slotPaletteChanged()
{
updateBackgroundColor();
for (auto i = m_colorControlledWidgets.begin(); i != m_colorControlledWidgets.end(); ++i) {
if (!*i) {
i = m_colorControlledWidgets.erase(i);
continue;
}
setBackgroundColorForWidget(*i, m_backgroundColor);
}
}
void BackgroundColorHelper::updateBackgroundColor()
{
// We use colors from the color scheme for mixing so it fits the theme.
const auto colorScheme = KColorScheme(QPalette::Normal, KColorScheme::Window);
const auto activeBackgroundColor = colorScheme.background(KColorScheme::BackgroundRole::ActiveBackground).color();
// We use the positive color for mixing so the end product doesn't look like a warning or error.
const auto positiveBackgroundColor = colorScheme.background(KColorScheme::BackgroundRole::PositiveBackground).color();
// Make sure the new background color has a meaningfully different hue than the activeBackgroundColor.
const int hueDifference = positiveBackgroundColor.hue() - activeBackgroundColor.hue();
int newHue;
if (std::abs(hueDifference) > 80) {
newHue = (activeBackgroundColor.hue() + positiveBackgroundColor.hue()) / 2;
} else {
newHue = hueDifference > 0 ?
activeBackgroundColor.hue() + 40 :
activeBackgroundColor.hue() - 40;
newHue %= 360; // hue needs to be between 0 and 359 per Qt documentation.
}
m_backgroundColor = QColor::fromHsv(newHue,
// Saturation should be closer to the active color because otherwise the selection mode color might overpower it.
.7 * activeBackgroundColor.saturation() + .3 * positiveBackgroundColor.saturation(),
(activeBackgroundColor.value() + positiveBackgroundColor.value()) / 2,
(activeBackgroundColor.alpha() + positiveBackgroundColor.alpha()) / 2);
}
BackgroundColorHelper *BackgroundColorHelper::s_instance = nullptr;
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