Qt 5.7 | Qt WebEngine | WebEngine Demo Browser Example | history.h Example File

Qt 5.7.1 Reference Documentation

# history.h Example File

webenginewidgets/demobrowser/history.h

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      #ifndef HISTORY_H
      #define HISTORY_H

      #include "modelmenu.h"

      #include <QtCore/QDateTime>
      #include <QtCore/QHash>
      #include <QtCore/QObject>
      #include <QtCore/QTimer>
      #include <QtCore/QUrl>

      #include <QtCore/QSortFilterProxyModel>

      class HistoryItem
      {
      public:
          HistoryItem() {}
          HistoryItem(const QString &u,
                      const QDateTime &d = QDateTime(), const QString &t = QString())
              : title(t), url(u), dateTime(d) {}

          inline bool operator==(const HistoryItem &other) const
              { return other.title == title
                && other.url == url && other.dateTime == dateTime; }

          // history is sorted in reverse
          inline bool operator <(const HistoryItem &other) const
              { return dateTime > other.dateTime; }

          QString title;
          QString url;
          QDateTime dateTime;
      };

      class AutoSaver;
      class HistoryModel;
      class HistoryFilterModel;
      class HistoryTreeModel;

      class HistoryManager : public QObject
      {
          Q_OBJECT
          Q_PROPERTY(int historyLimit READ historyLimit WRITE setHistoryLimit)

      signals:
          void historyReset();
          void entryAdded(const HistoryItem &item);
          void entryRemoved(const HistoryItem &item);
          void entryUpdated(int offset);

      public:
          HistoryManager(QObject *parent = 0);
          ~HistoryManager();

          bool historyContains(const QString &url) const;

          void addHistoryEntry(const QString &url);
          void removeHistoryEntry(const QString &url);

          void updateHistoryItem(const QUrl &url, const QString &title);

          int historyLimit() const;
          void setHistoryLimit(int limit);

          QList<HistoryItem>& history();
          void setHistory(const QList<HistoryItem> &history, bool loadedAndSorted = false);

          // History manager keeps around these models for use by the completer and other classes
          HistoryModel *historyModel() const;
          HistoryFilterModel *historyFilterModel() const;
          HistoryTreeModel *historyTreeModel() const;

      public slots:
          void clear();
          void loadSettings();

      private slots:
          void save();
          void checkForExpired(bool removeExpiredEntriesDirectly = false);

      protected:
          void addHistoryItem(const HistoryItem &item);
          void removeHistoryItem(const HistoryItem &item);

      private:
          void load();

          AutoSaver *m_saveTimer;
          int m_historyLimit;
          QTimer m_expiredTimer;
          QList<HistoryItem> m_history;
          QString m_lastSavedUrl;

          HistoryModel *m_historyModel;
          HistoryFilterModel *m_historyFilterModel;
          HistoryTreeModel *m_historyTreeModel;
      };

      class HistoryModel : public QAbstractTableModel
      {
          Q_OBJECT

      public slots:
          void historyReset();
          void entryAdded(const HistoryItem &item);
          void entryRemoved(const HistoryItem &item);
          void entryUpdated(int offset);

      public:
          enum Roles {
              DateRole = Qt::UserRole + 1,
              DateTimeRole = Qt::UserRole + 2,
              UrlRole = Qt::UserRole + 3,
              UrlStringRole = Qt::UserRole + 4
          };

          HistoryModel(HistoryManager *history, QObject *parent = 0);
          QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
          QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
          int columnCount(const QModelIndex &parent = QModelIndex()) const;
          int rowCount(const QModelIndex &parent = QModelIndex()) const;
          bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());

      private:
          HistoryManager *m_history;
      };

      /*!
          Proxy model that will remove any duplicate entries.
          Both m_sourceRow and m_historyHash store their offsets not from
          the front of the list, but as offsets from the back.
        */
      class HistoryFilterModel : public QAbstractProxyModel
      {
          Q_OBJECT

      public:
          HistoryFilterModel(QAbstractItemModel *sourceModel, QObject *parent = 0);

          inline bool historyContains(const QString &url) const
              { load(); return m_historyHash.contains(url); }

          QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
          QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
          void setSourceModel(QAbstractItemModel *sourceModel);
          QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
          int rowCount(const QModelIndex &parent = QModelIndex()) const;
          int columnCount(const QModelIndex &parent = QModelIndex()) const;
          QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;
          QModelIndex parent(const QModelIndex& index= QModelIndex()) const;
          bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());

      private slots:
          void sourceReset();
          void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
          void sourceRowsInserted(const QModelIndex &parent, int start, int end);
          void sourceRowsRemoved(const QModelIndex &, int, int);

      private:
          void load() const;

          mutable QList<int> m_sourceRow;
          mutable QHash<QString, int> m_historyHash;
          mutable bool m_loaded;
      };

      /*
          The history menu
          - Removes the first twenty entries and puts them as children of the top level.
          - If there are less then twenty entries then the first folder is also removed.

          The mapping is done by knowing that HistoryTreeModel is over a table
          We store that row offset in our index's private data.
      */
      class HistoryMenuModel : public QAbstractProxyModel
      {
          Q_OBJECT

      public:
          HistoryMenuModel(HistoryTreeModel *sourceModel, QObject *parent = 0);
          int columnCount(const QModelIndex &parent) const;
          int rowCount(const QModelIndex &parent = QModelIndex()) const;
          QModelIndex mapFromSource(const QModelIndex & sourceIndex) const;
          QModelIndex mapToSource(const QModelIndex & proxyIndex) const;
          QModelIndex index(int, int, const QModelIndex &parent = QModelIndex()) const;
          QModelIndex parent(const QModelIndex &index = QModelIndex()) const;

          int bumpedRows() const;

      private:
          HistoryTreeModel *m_treeModel;
      };

      // Menu that is dynamically populated from the history
      class HistoryMenu : public ModelMenu
      {
          Q_OBJECT

      signals:
          void openUrl(const QUrl &url);

      public:
           HistoryMenu(QWidget *parent = 0);
           void setInitialActions(QList<QAction*> actions);

      protected:
          bool prePopulated();
          void postPopulated();

      private slots:
          void activated(const QModelIndex &index);
          void showHistoryDialog();

      private:
          HistoryManager *m_history;
          HistoryMenuModel *m_historyMenuModel;
          QList<QAction*> m_initialActions;
      };

      // proxy model for the history model that
      // exposes each url http://www.foo.com and it url starting at the host www.foo.com
      class HistoryCompletionModel : public QAbstractProxyModel
      {
          Q_OBJECT

      public:
          HistoryCompletionModel(QObject *parent = 0);
          QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
          int rowCount(const QModelIndex &parent = QModelIndex()) const;
          int columnCount(const QModelIndex &parent = QModelIndex()) const;
          QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
          QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
          QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;
          QModelIndex parent(const QModelIndex& index= QModelIndex()) const;
          void setSourceModel(QAbstractItemModel *sourceModel);

      private slots:
          void sourceReset();

      };

      // proxy model for the history model that converts the list
      // into a tree, one top level node per day.
      // Used in the HistoryDialog.
      class HistoryTreeModel : public QAbstractProxyModel
      {
          Q_OBJECT

      public:
          HistoryTreeModel(QAbstractItemModel *sourceModel, QObject *parent = 0);
          QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
          int columnCount(const QModelIndex &parent) const;
          int rowCount(const QModelIndex &parent = QModelIndex()) const;
          QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
          QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
          QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
          QModelIndex parent(const QModelIndex &index= QModelIndex()) const;
          bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
          Qt::ItemFlags flags(const QModelIndex &index) const;
          bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
          QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;

          void setSourceModel(QAbstractItemModel *sourceModel);

      private slots:
          void sourceReset();
          void sourceRowsInserted(const QModelIndex &parent, int start, int end);
          void sourceRowsRemoved(const QModelIndex &parent, int start, int end);
          void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight,
                                 const QVector<int> roles);
      private:
          int sourceDateRow(int row) const;
          mutable QList<int> m_sourceRowCache;

      };

      // A modified QSortFilterProxyModel that always accepts the root nodes in the tree
      // so filtering is only done on the children.
      // Used in the HistoryDialog
      class TreeProxyModel : public QSortFilterProxyModel
      {
          Q_OBJECT

      public:
          TreeProxyModel(QObject *parent = 0);

      protected:
          bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;
      };

      #include "ui_history.h"

      class HistoryDialog : public QDialog, public Ui_HistoryDialog
      {
          Q_OBJECT

      signals:
          void openUrl(const QUrl &url);

      public:
          HistoryDialog(QWidget *parent = 0, HistoryManager *history = 0);

      private slots:
          void customContextMenuRequested(const QPoint &pos);
          void open();
          void copy();

      };

      #endif // HISTORY_H