widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QMimeDatabase>
#include <QMultiHash>

class QFileInfo;
class QTreeWidget;
class QListWidget;
class QPushButton;

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();


private slots:
    void onMimetypeSelected();
    void onSetDefaultClicked();

private:
    void loadDesktopFile(const QFileInfo &fileInfo);
    void setDefault(const QString &appName, const QSet<QString> &mimetypes, const QSet<QString> &unselectedMimetypes);
    void loadIcons(const QString &path);

    QMultiHash<QString, QString> m_supportedMimetypes;
    QMultiHash<QString, QString> m_childMimeTypes;
    QHash<QString, QSet<QString>> m_applications;
    QHash<QString, QString> m_applicationIcons;
    QHash<QString, QString> m_applicationNames;
    QHash<QString, QString> m_desktopFileNames;

    QHash<QString, QString> m_appIdToDesktopFile;

    QHash<QString, QIcon> m_mimeTypeIcons; // for preloading icons, because that's (a bit) slooow
    QHash<QString, QString> m_iconPaths;

    QTreeWidget *m_applicationList;
    QMimeDatabase m_mimeDb;
    QListWidget *m_mimetypeList;
    QPushButton *m_setDefaultButton;
};

#endif // WIDGET_H