File indexing completed on 2024-04-21 05:45:26

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2022 Felix Ernst <felixernst@kde.org>
 
     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 <QPointer>
 
 #include <memory>
 
 class QWidget;
 
 namespace SelectionMode
 {
 
 /**
  * @brief A Singleton class for managing the colors of selection mode widgets.
  */
 class BackgroundColorHelper
 {
 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);
 
 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