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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
*/
#ifndef BACKGROUNDCOLORHELPER_H
#define BACKGROUNDCOLORHELPER_H
#include <QColor>
#include <QObject>
#include <QPointer>
#include <memory>
class QWidget;
namespace SelectionMode
{
/**
* @brief A Singleton class for managing the colors of selection mode widgets.
*/
class BackgroundColorHelper : public QObject
{
Q_OBJECT
public:
static BackgroundColorHelper *instance();
/**
* Changes the background color of @p widget to a distinct color scheme matching color which makes it clear that the widget belongs to the selection mode.
* The background color of @p widget will from now on be updated automatically when the palette of the application changes.
*/
void controlBackgroundColor(QWidget *widget);
protected:
bool eventFilter(QObject *obj, QEvent *event) override;
private:
BackgroundColorHelper();
/**
* Called when the palette of the application changes.
* Triggers updateBackgroundColor() and the updates the background color of m_colorControlledWidgets.
* @see updateBackgroundColor
*/
void slotPaletteChanged();
/** Calculates a new m_colorControlledWidgets based on the current colour scheme of the application. */
void updateBackgroundColor();
private:
/// The widgets who have given up control over the background color to BackgroundColorHelper.
std::vector<QPointer<QWidget>> m_colorControlledWidgets;
/// The color to be used for the widgets' backgrounds.
QColor m_backgroundColor;
/// Singleton object
static BackgroundColorHelper *s_instance;
};
}
#endif // BACKGROUNDCOLORHELPER_H
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