feat: option to disable gallery looping

This change is sponsored by @superuser7777

Related: https://github.com/BLumia/pineapple-pictures/issues/153

app/mainwindow.cpp

@@ -139,10 +139,7 @@ MainWindow::MainWindow(QWidget *parent)
     m_gv->setOpacity(0, false);
     m_closeButton->setOpacity(0, false);
 
-    connect(m_pm, &PlaylistManager::totalCountChanged, this, [this](int galleryFileCount) {
+    connect(m_pm, &PlaylistManager::totalCountChanged, this, &MainWindow::updateGalleryButtonsVisibility);
-        m_prevButton->setVisible(galleryFileCount > 1);
-        m_nextButton->setVisible(galleryFileCount > 1);
-    });
 
     connect(m_pm->model(), &PlaylistModel::modelReset, this, std::bind(&MainWindow::galleryCurrent, this, false, false));
     connect(m_pm, &PlaylistManager::currentIndexChanged, this, std::bind(&MainWindow::galleryCurrent, this, true, false));
@@ -279,6 +276,8 @@ void MainWindow::galleryCurrent(bool showLoadImageHintWhenEmpty, bool reloadImag
         m_graphicsView->showText(QCoreApplication::translate("GraphicsScene", "Drag image here"));
     }
 
+    updateGalleryButtonsVisibility();
+
     if (shouldResetfileWatcher) updateFileWatcher();
 }
 
@@ -603,8 +602,7 @@ void MainWindow::toggleProtectedMode()
 {
     m_protectedMode = !m_protectedMode;
     m_closeButton->setVisible(!m_protectedMode);
-    m_prevButton->setVisible(!m_protectedMode);
+    updateGalleryButtonsVisibility();
-    m_nextButton->setVisible(!m_protectedMode);
 }
 
 void MainWindow::toggleStayOnTop()
@@ -927,3 +925,13 @@ bool MainWindow::updateFileWatcher(const QString &basePath)
     if (!basePath.isEmpty()) return m_fileSystemWatcher->addPath(basePath);
     return false;
 }
+
+void MainWindow::updateGalleryButtonsVisibility()
+{
+    const int galleryFileCount = m_pm->totalCount();
+    const bool loopGallery = Settings::instance()->loopGallery();
+    m_prevButton->setVisible(!m_protectedMode && galleryFileCount > 1);
+    m_nextButton->setVisible(!m_protectedMode && galleryFileCount > 1);
+    m_prevButton->setEnabled(loopGallery || !m_pm->isFirstIndex());
+    m_nextButton->setEnabled(loopGallery || !m_pm->isLastIndex());
+}

app/mainwindow.h

@@ -110,6 +110,7 @@ private slots:
 
 private:
     bool updateFileWatcher(const QString & basePath = QString());
+    void updateGalleryButtonsVisibility();
 
 private:
     ActionManager *m_am;

app/playlistmanager.cpp

@@ -196,7 +196,7 @@ QModelIndex PlaylistManager::previousIndex() const
     int count = totalCount();
     if (count == 0) return {};
 
-    return m_model.index(m_currentIndex - 1 < 0 ? count - 1 : m_currentIndex - 1);
+    return m_model.index(isFirstIndex() ? count - 1 : m_currentIndex - 1);
 }
 
 QModelIndex PlaylistManager::nextIndex() const
@@ -204,7 +204,7 @@ QModelIndex PlaylistManager::nextIndex() const
     int count = totalCount();
     if (count == 0) return {};
 
-    return m_model.index(m_currentIndex + 1 == count ? 0 : m_currentIndex + 1);
+    return m_model.index(isLastIndex() ? 0 : m_currentIndex + 1);
 }
 
 QModelIndex PlaylistManager::curIndex() const
@@ -212,6 +212,16 @@ QModelIndex PlaylistManager::curIndex() const
     return m_model.index(m_currentIndex);
 }
 
+bool PlaylistManager::isFirstIndex() const
+{
+    return m_currentIndex == 0;
+}
+
+bool PlaylistManager::isLastIndex() const
+{
+    return m_currentIndex + 1 == totalCount();
+}
+
 void PlaylistManager::setCurrentIndex(const QModelIndex &index)
 {
     if (index.isValid() && index.row() >= 0 && index.row() < totalCount()) {

app/playlistmanager.h

@@ -62,10 +62,12 @@ public:
     Q_INVOKABLE QModelIndex loadPlaylist(const QList<QUrl> & urls);
     Q_INVOKABLE QModelIndex loadPlaylist(const QUrl & url);
 
-    int totalCount() const;
+    inline int totalCount() const;
     QModelIndex previousIndex() const;
     QModelIndex nextIndex() const;
     QModelIndex curIndex() const;
+    inline bool isFirstIndex() const;
+    inline bool isLastIndex() const;
     void setCurrentIndex(const QModelIndex & index);
     QUrl urlByIndex(const QModelIndex & index);
     QString localFileByIndex(const QModelIndex & index);

app/settings.cpp

@@ -60,6 +60,11 @@ bool Settings::useLightCheckerboard() const
     return m_qsettings->value("use_light_checkerboard", false).toBool();
 }
 
+bool Settings::loopGallery() const
+{
+    return m_qsettings->value("loop_gallery", true).toBool();
+}
+
 Settings::DoubleClickBehavior Settings::doubleClickBehavior() const
 {
     QString result = m_qsettings->value("double_click_behavior", "Close").toString();
@@ -106,6 +111,12 @@ void Settings::setUseLightCheckerboard(bool light)
     m_qsettings->sync();
 }
 
+void Settings::setLoopGallery(bool on)
+{
+    m_qsettings->setValue("loop_gallery", on);
+    m_qsettings->sync();
+}
+
 void Settings::setDoubleClickBehavior(DoubleClickBehavior dcb)
 {
     m_qsettings->setValue("double_click_behavior", QEnumHelper::toString(dcb));

app/settings.h

@@ -37,6 +37,7 @@ public:
     bool stayOnTop() const;
     bool useBuiltInCloseAnimation() const;
     bool useLightCheckerboard() const;
+    bool loopGallery() const;
     DoubleClickBehavior doubleClickBehavior() const;
     MouseWheelBehavior mouseWheelBehavior() const;
     WindowSizeBehavior initWindowSizeBehavior() const;
@@ -45,6 +46,7 @@ public:
     void setStayOnTop(bool on);
     void setUseBuiltInCloseAnimation(bool on);
     void setUseLightCheckerboard(bool light);
+    void setLoopGallery(bool on);
     void setDoubleClickBehavior(DoubleClickBehavior dcb);
     void setMouseWheelBehavior(MouseWheelBehavior mwb);
     void setInitWindowSizeBehavior(WindowSizeBehavior wsb);

app/settingsdialog.cpp

@@ -22,6 +22,7 @@ SettingsDialog::SettingsDialog(QWidget *parent)
     , m_stayOnTop(new QCheckBox)
     , m_useBuiltInCloseAnimation(new QCheckBox)
     , m_useLightCheckerboard(new QCheckBox)
+    , m_loopGallery(new QCheckBox)
     , m_doubleClickBehavior(new QComboBox)
     , m_mouseWheelBehavior(new QComboBox)
     , m_initWindowSizeBehavior(new QComboBox)
@@ -121,6 +122,7 @@ SettingsDialog::SettingsDialog(QWidget *parent)
     settingsForm->addRow(tr("Stay on top when start-up"), m_stayOnTop);
     settingsForm->addRow(tr("Use built-in close window animation"), m_useBuiltInCloseAnimation);
     settingsForm->addRow(tr("Use light-color checkerboard"), m_useLightCheckerboard);
+    settingsForm->addRow(tr("Loop the loaded gallery"), m_loopGallery);
     settingsForm->addRow(tr("Double-click behavior"), m_doubleClickBehavior);
     settingsForm->addRow(tr("Mouse wheel behavior"), m_mouseWheelBehavior);
     settingsForm->addRow(tr("Default window size"), m_initWindowSizeBehavior);
@@ -129,6 +131,7 @@ SettingsDialog::SettingsDialog(QWidget *parent)
     m_stayOnTop->setChecked(Settings::instance()->stayOnTop());
     m_useBuiltInCloseAnimation->setChecked(Settings::instance()->useBuiltInCloseAnimation());
     m_useLightCheckerboard->setChecked(Settings::instance()->useLightCheckerboard());
+    m_loopGallery->setChecked(Settings::instance()->loopGallery());
     m_doubleClickBehavior->setModel(new QStringListModel(dcbDropDown));
     Settings::DoubleClickBehavior dcb = Settings::instance()->doubleClickBehavior();
     m_doubleClickBehavior->setCurrentIndex(static_cast<int>(dcb));
@@ -147,18 +150,30 @@ SettingsDialog::SettingsDialog(QWidget *parent)
         }
     }
 
-    connect(m_stayOnTop, &QCheckBox::stateChanged, this, [ = ](int state){
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+# define QCHECKBOX_CHECKSTATECHANGED QCheckBox::checkStateChanged
+# define QT_CHECKSTATE Qt::CheckState
+#else
+# define QCHECKBOX_CHECKSTATECHANGED QCheckBox::stateChanged
+# define QT_CHECKSTATE int
+#endif // QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+
+    connect(m_stayOnTop, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
         Settings::instance()->setStayOnTop(state == Qt::Checked);
     });
 
-    connect(m_useBuiltInCloseAnimation, &QCheckBox::stateChanged, this, [ = ](int state){
+    connect(m_useBuiltInCloseAnimation, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
         Settings::instance()->setUseBuiltInCloseAnimation(state == Qt::Checked);
     });
 
-    connect(m_useLightCheckerboard, &QCheckBox::stateChanged, this, [ = ](int state){
+    connect(m_useLightCheckerboard, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
         Settings::instance()->setUseLightCheckerboard(state == Qt::Checked);
     });
 
+    connect(m_loopGallery, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
+        Settings::instance()->setLoopGallery(state == Qt::Checked);
+    });
+
     connect(m_doubleClickBehavior, QOverload<int>::of(&QComboBox::currentIndexChanged), this, [ = ](int index){
         Settings::instance()->setDoubleClickBehavior(_dc_options.at(index).first);
     });

app/settingsdialog.h

@@ -25,6 +25,7 @@ private:
     QCheckBox * m_stayOnTop = nullptr;
     QCheckBox * m_useBuiltInCloseAnimation = nullptr;
     QCheckBox * m_useLightCheckerboard = nullptr;
+    QCheckBox * m_loopGallery = nullptr;
     QComboBox * m_doubleClickBehavior = nullptr;
     QComboBox * m_mouseWheelBehavior = nullptr;
     QComboBox * m_initWindowSizeBehavior = nullptr;