pc-system/components/MultiSelectComboBox.h

#ifndef MULTISELECTCOMBOBOX_H
#define MULTISELECTCOMBOBOX_H

#include <QAbstractItemView>
#include <QComboBox>
#include <QListView>
#include <QPainter>
#include <QPair>
#include <QStandardItem>
#include <QStandardItemModel>

class MultiSelectComboBox : public QComboBox {
    Q_OBJECT

   public:
    explicit MultiSelectComboBox(QWidget *parent = nullptr);
    ~MultiSelectComboBox();

    void addItem(const QString &key, const QString &value);
    void addItems(const QList<QPair<QString, QString>> &items);

    QStringList checkedKeys() const;
    QList<QPair<QString, QString>> checkedItemsWithKeys() const;
    void setCheckedKeys(const QStringList &keys);

   protected:
    bool eventFilter(QObject *object, QEvent *event) override;
    void showPopup() override;
    void hidePopup() override;
    void paintEvent(QPaintEvent *event) override;

   private slots:
    void onItemChanged(QStandardItem *item);
    void updateText();

   private:
    void initialize();
    QStandardItemModel *model() const;

    QString displayText;
    bool skipNextHide;

   signals:
    void selectionChanged();
};

#endif  // MULTISELECTCOMBOBOX_H