From 8e910f26a28b1b1beae363e6c19f39224f74e2e8 Mon Sep 17 00:00:00 2001
From: "Felix (xq) Queißner" <git@mq32.de>
Date: Mon, 29 Jun 2020 20:17:42 +0200
Subject: Paves road for new favourite system: Refactors the favourites into
 tree structure instead of flat list.

---
 src/favouritecollection.hpp | 129 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 111 insertions(+), 18 deletions(-)

(limited to 'src/favouritecollection.hpp')

diff --git a/src/favouritecollection.hpp b/src/favouritecollection.hpp
index 043fdf2..ea107ab 100644
--- a/src/favouritecollection.hpp
+++ b/src/favouritecollection.hpp
@@ -1,48 +1,141 @@
 #ifndef FAVOURITECOLLECTION_HPP
 #define FAVOURITECOLLECTION_HPP
 
-#include <QObject>
-#include <QAbstractListModel>
+#include <QAbstractItemModel>
 #include <QUrl>
+#include <QString>
+#include <memory>
 #include <QSettings>
 
+struct Favourite
+{
+    QString title;
+    QUrl destination;
+
+    bool isValid() const {
+        return destination.isValid();
+    }
 
-class FavouriteCollection : public QAbstractListModel
+    QString getTitle() const {
+        if(title.isEmpty())
+            return destination.toString(QUrl::FullyDecoded);
+        else
+            return title;
+    }
+};
+
+class FavouriteCollection : public QAbstractItemModel
 {
     Q_OBJECT
+    struct Node  {
+        enum Type { Root, Group, Favourite };
+        Node * parent = nullptr;
+        int index = 0;
+        std::vector<std::unique_ptr<Node>> children;
+        Type type;
+        explicit Node(Type t) : type(t) { }
+        virtual ~Node() = default;
+
+        template<typename T>
+        T & as() { return *static_cast<T*>(this); }
+
+        template<typename T>
+        T const & as() const { return *static_cast<T const*>(this); }
+    };
+
+    struct FavouriteNode : Node {
+        ::Favourite favourite;
+        FavouriteNode() : Node(Favourite) { }
+        ~FavouriteNode() override = default;
+    };
+
+    struct GroupNode : Node {
+        QString title;
+        GroupNode() : Node(Group) { }
+        ~GroupNode() override = default;
+    };
+
+    struct RootNode : Node {
+        RootNode() : Node(Root) { }
+        ~RootNode() override = default;
+    };
+
 public:
     explicit FavouriteCollection(QObject *parent = nullptr);
 
-    void add(QUrl const & url);
+    FavouriteCollection(FavouriteCollection const & other);
 
-    void remove(QUrl const & url);
+    FavouriteCollection & operator=(FavouriteCollection const &);
+    FavouriteCollection & operator=(FavouriteCollection &&);
 
-    bool contains(QUrl const & url);
+public:
+    void load(QSettings & settings);
 
-    QUrl get(QModelIndex const & index) const ;
+    void save(QSettings & settings) const;
 
-    bool save(QString const & fileName) const;
-    bool save(QSettings & settings) const;
+    bool addGroup(QString const & group);
 
-    bool load(QString const & fileName);
-    bool load(QSettings & settings);
+    bool addFavourite(QString const & group, Favourite const & fav);
 
-    QVector<QUrl> getAll() const {
-        return this->items;
-    }
+    Favourite getFavourite(QModelIndex const & index) const;
+
+    Favourite * getMutableFavourite(QModelIndex const & index);
+
+    QStringList groups() const;
+
+    //! Returns the group name of the index.
+    QString group(QModelIndex const & index) const;
+
+    bool destroyFavourite(QModelIndex const & index);
+
+    bool canDeleteGroup(QString const & group_name);
+    bool deleteGroup(QString const & group_name);
+
+    //! Returns a list of non-mutable references to all contained identities
+    QVector<Favourite const *> allFavourites() const;
+
+    bool containsUrl(QUrl const & url) const;
+
+    bool addUnsorted(QUrl const & url);
+
+    bool removeUrl(QUrl const & url);
 
 public:
-    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    // Header:
+    // QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+
+    // Basic functionality:
+    QModelIndex index(int row, int column,
+                      const QModelIndex &parent = QModelIndex()) const override;
+    QModelIndex parent(const QModelIndex &index) const override;
 
-    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
 
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
 
-signals:
+    // Drag'n'Drop
+
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+
+    QStringList mimeTypes() const override;
+    QMimeData *mimeData(const QModelIndexList &indexes) const override;
+    bool canDropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const override;
+    bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;
+    Qt::DropActions supportedDropActions() const override;
+
+    Qt::DropActions supportedDragActions() const override;
+
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex()) override;
+
 
 private:
-    QVector<QUrl> items;
+    void relayout();
+
+    bool internalAddGroup(QString const & group_name, GroupNode * & out_group);
 
+private:
+    RootNode root;
 };
 
 #endif // FAVOURITECOLLECTION_HPP
-- 
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