src/views/versioncontrol/versioncontrolobserver.h

   1 /*
   2  * SPDX-FileCopyrightText: 2009 Peter Penz <peter.penz19@gmail.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-or-later
   5  */
   6
   7 #ifndef VERSIONCONTROLOBSERVER_H
   8 #define VERSIONCONTROLOBSERVER_H
   9
  10 #include "dolphin_export.h"
  11
  12 #include "kversioncontrolplugin.h"
  13
  14 #include <KFileItem>
  15
  16 #include <QList>
  17 #include <QObject>
  18 #include <QString>
  19 #include <QUrl>
  20
  21 class KFileItemList;
  22 class KFileItemModel;
  23 class KItemRangeList;
  24 class QAction;
  25 class QTimer;
  26 class UpdateItemStatesThread;
  27
  28 class DolphinView;
  29
  30 /**
  31  * @brief Observes all version control plugins.
  32  *
  33  * The items of the directory-model get updated automatically if the currently
  34  * shown directory is under version control.
  35  *
  36  * @see VersionControlPlugin
  37  */
  38 class DOLPHIN_EXPORT VersionControlObserver : public QObject
  39 {
  40     Q_OBJECT
  41
  42 public:
  43     explicit VersionControlObserver(QObject* parent = nullptr);
  44     ~VersionControlObserver() override;
  45
  46     void setModel(KFileItemModel* model);
  47     KFileItemModel* model() const;
  48     void setView(DolphinView* view);
  49     DolphinView* view() const;
  50
  51     QList<QAction*> actions(const KFileItemList& items) const;
  52
  53 signals:
  54     /**
  55      * Is emitted if an information message with the content \a msg
  56      * should be shown.
  57      */
  58     void infoMessage(const QString& msg);
  59
  60     /**
  61      * Is emitted if an error message with the content \a msg
  62      * should be shown.
  63      */
  64     void errorMessage(const QString& msg);
  65
  66     /**
  67      * Is emitted if an "operation completed" message with the content \a msg
  68      * should be shown.
  69      */
  70     void operationCompletedMessage(const QString& msg);
  71
  72 private slots:
  73     /**
  74      * Invokes verifyDirectory() with a small delay. If delayedDirectoryVerification()
  75      * is invoked before the delay has been exceeded, the delay will be reset. This
  76      * assures that a lot of short requests for directory verification only result
  77      * in one (expensive) call.
  78      */
  79     void delayedDirectoryVerification();
  80
  81     /**
  82      * Invokes verifyDirectory() with a small delay. In opposite to
  83      * delayedDirectoryVerification() it and assures that the verification of
  84      * the directory is done silently without information messages.
  85      */
  86     void silentDirectoryVerification();
  87
  88     /**
  89      * Invokes delayedDirectoryVerification() only if the itemsChanged() signal has not
  90      * been triggered by the VCS plugin itself.
  91      */
  92     void slotItemsChanged(const KItemRangeList& itemRanges, const QSet<QByteArray>& roles);
  93
  94     void verifyDirectory();
  95
  96     /**
  97      * Is invoked if the thread m_updateItemStatesThread has been finished
  98      * and applys the item states.
  99      */
 100     void slotThreadFinished();
 101
 102 private:
 103     typedef QPair<KFileItem, KVersionControlPlugin::ItemVersion> ItemState;
 104     typedef QPair<KVersionControlPlugin*, QString> VCSPlugin;
 105
 106     void updateItemStates();
 107
 108     /**
 109      * It creates a item state list for every expanded directory and stores
 110      * this list together with the directory url in the \a itemStates map.
 111      *
 112      * @itemStates      A map of item state lists for every expanded directory
 113      *                  and its items, where the "key" is the directory url and
 114      *                  the "value" is a list of ItemStates for every item
 115      *                  within this directory.
 116      * @firstIndex      The index to start the processing from, this is needed
 117      *                  because this function is recursively called.
 118      *
 119      * @return          The number of (recursive) processed items.
 120      */
 121     int createItemStatesList(QMap<QString, QVector<ItemState> >& itemStates,
 122                              const int firstIndex = 0);
 123
 124     /**
 125      * Returns a matching plugin for the given directory.
 126      * 0 is returned, if no matching plugin has been found.
 127      */
 128     KVersionControlPlugin* searchPlugin(const QUrl& directory);
 129
 130     /**
 131      * Returns true, if the directory contains a version control information.
 132      */
 133     bool isVersionControlled() const;
 134
 135 private:
 136     bool m_pendingItemStatesUpdate;
 137     bool m_versionedDirectory;
 138     bool m_silentUpdate; // if true, no messages will be send during the update
 139                          // of version states
 140
 141     DolphinView* m_view;
 142     KFileItemModel* m_model;
 143
 144     QTimer* m_dirVerificationTimer;
 145
 146     bool m_pluginsInitialized;
 147     KVersionControlPlugin* m_plugin;
 148     QList<VCSPlugin> m_plugins;
 149     UpdateItemStatesThread* m_updateItemStatesThread;
 150
 151     friend class UpdateItemStatesThread;
 152 };
 153
 154 #endif // REVISIONCONTROLOBSERVER_H
 155