Reader: make 12 keyboard shortcuts work with non-Latin layouts

Viewer::keyPressEvent()'s custom matching of these shortcuts is the same
as MainWindowViewer::keyPressEvent()'s before the recent commit
"Reader: make 3 keyboard shortcuts work with non-Latin layouts". That
commit's message details the issues with the custom code.

render->hasLoadedComic() condition in Viewer::keyPressEvent() becomes
true when Comic::_loaded is set to true. This always happens right after
Comic emits its numPages() signal. That is why the 12 fixed actions are
now enabled when Viewer emits its comicLoaded() signal, which is
connected to Render::numPages, which in turn is connected to
Comic::numPages signal.

The 12 fixed actions are now disabled when most other actions are
disabled: before a comic is opened and on comic opening error.

YACReader/main_window_viewer.cpp

@@ -24,6 +24,8 @@
 
 #include <ctime>
 #include <algorithm>
+#include <utility>
+
 #include <QApplication>
 #include <QCoreApplication>
 #include <QToolButton>
@@ -137,6 +139,7 @@ void MainWindowViewer::setupUI()
     // setUnifiedTitleAndToolBarOnMac(true);
 
     viewer = new Viewer(this);
+    connect(viewer, &Viewer::comicLoaded, this, [this] { setLoadedComicActionsEnabled(true); });
     connect(viewer, &Viewer::reset, this, &MainWindowViewer::processReset);
     // detected end of comic
     connect(viewer, &Viewer::openNextComic, this, &MainWindowViewer::openNextComic);
@@ -958,6 +961,7 @@ void MainWindowViewer::enableActions()
 void MainWindowViewer::disableActions()
 {
     setActionsEnabled(false);
+    setLoadedComicActionsEnabled(false);
     setBookmarkAction->setEnabled(false);
 }
 
@@ -1236,50 +1240,76 @@ void MainWindowViewer::setUpShortcutsManagement()
     auto autoScrollForwardAction = new QAction(tr("Autoscroll down"), orphanActions);
     autoScrollForwardAction->setData(AUTO_SCROLL_FORWARD_ACTION_Y);
     autoScrollForwardAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_ACTION_Y));
+    connect(autoScrollForwardAction, &QAction::triggered, viewer, &Viewer::scrollForward);
 
     auto autoScrollBackwardAction = new QAction(tr("Autoscroll up"), orphanActions);
     autoScrollBackwardAction->setData(AUTO_SCROLL_BACKWARD_ACTION_Y);
     autoScrollBackwardAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_ACTION_Y));
+    connect(autoScrollBackwardAction, &QAction::triggered, viewer, &Viewer::scrollBackward);
 
     auto autoScrollForwardHorizontalFirstAction = new QAction(tr("Autoscroll forward, horizontal first"), orphanActions);
     autoScrollForwardHorizontalFirstAction->setData(AUTO_SCROLL_FORWARD_HORIZONTAL_FIRST_ACTION_Y);
     autoScrollForwardHorizontalFirstAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_HORIZONTAL_FIRST_ACTION_Y));
+    connect(autoScrollForwardHorizontalFirstAction, &QAction::triggered, viewer, &Viewer::scrollForwardHorizontalFirst);
 
     auto autoScrollBackwardHorizontalFirstAction = new QAction(tr("Autoscroll backward, horizontal first"), orphanActions);
     autoScrollBackwardHorizontalFirstAction->setData(AUTO_SCROLL_BACKWARD_HORIZONTAL_FIRST_ACTION_Y);
     autoScrollBackwardHorizontalFirstAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_HORIZONTAL_FIRST_ACTION_Y));
+    connect(autoScrollBackwardHorizontalFirstAction, &QAction::triggered, viewer, &Viewer::scrollBackwardHorizontalFirst);
 
     auto autoScrollForwardVerticalFirstAction = new QAction(tr("Autoscroll forward, vertical first"), orphanActions);
     autoScrollForwardVerticalFirstAction->setData(AUTO_SCROLL_FORWARD_VERTICAL_FIRST_ACTION_Y);
     autoScrollForwardVerticalFirstAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_VERTICAL_FIRST_ACTION_Y));
+    connect(autoScrollForwardVerticalFirstAction, &QAction::triggered, viewer, &Viewer::scrollForwardVerticalFirst);
 
     auto autoScrollBackwardVerticalFirstAction = new QAction(tr("Autoscroll backward, vertical first"), orphanActions);
     autoScrollBackwardVerticalFirstAction->setData(AUTO_SCROLL_BACKWARD_VERTICAL_FIRST_ACTION_Y);
     autoScrollBackwardVerticalFirstAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_VERTICAL_FIRST_ACTION_Y));
+    connect(autoScrollBackwardVerticalFirstAction, &QAction::triggered, viewer, &Viewer::scrollBackwardVerticalFirst);
 
     auto moveDownAction = new QAction(tr("Move down"), orphanActions);
     moveDownAction->setData(MOVE_DOWN_ACTION_Y);
     moveDownAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(MOVE_DOWN_ACTION_Y));
+    connect(moveDownAction, &QAction::triggered, viewer, [this] { viewer->moveView(Qt::Key_Down); });
 
     auto moveUpAction = new QAction(tr("Move up"), orphanActions);
     moveUpAction->setData(MOVE_UP_ACTION_Y);
     moveUpAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(MOVE_UP_ACTION_Y));
+    connect(moveUpAction, &QAction::triggered, viewer, [this] { viewer->moveView(Qt::Key_Up); });
 
     auto moveLeftAction = new QAction(tr("Move left"), orphanActions);
     moveLeftAction->setData(MOVE_LEFT_ACTION_Y);
     moveLeftAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(MOVE_LEFT_ACTION_Y));
+    connect(moveLeftAction, &QAction::triggered, viewer, [this] { viewer->moveView(Qt::Key_Left); });
 
     auto moveRightAction = new QAction(tr("Move right"), orphanActions);
     moveRightAction->setData(MOVE_RIGHT_ACTION_Y);
     moveRightAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(MOVE_RIGHT_ACTION_Y));
+    connect(moveRightAction, &QAction::triggered, viewer, [this] { viewer->moveView(Qt::Key_Right); });
 
     auto goToFirstPageAction = new QAction(tr("Go to the first page"), orphanActions);
     goToFirstPageAction->setData(GO_TO_FIRST_PAGE_ACTION_Y);
     goToFirstPageAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(GO_TO_FIRST_PAGE_ACTION_Y));
+    connect(goToFirstPageAction, &QAction::triggered, viewer, &Viewer::goToFirstPage);
 
     auto goToLastPageAction = new QAction(tr("Go to the last page"), orphanActions);
     goToLastPageAction->setData(GO_TO_LAST_PAGE_ACTION_Y);
     goToLastPageAction->setShortcut(ShortcutsManager::getShortcutsManager().getShortcut(GO_TO_LAST_PAGE_ACTION_Y));
+    connect(goToLastPageAction, &QAction::triggered, viewer, &Viewer::goToLastPage);
+
+    loadedComicActions = { autoScrollForwardAction,
+                           autoScrollBackwardAction,
+                           autoScrollForwardHorizontalFirstAction,
+                           autoScrollBackwardHorizontalFirstAction,
+                           autoScrollForwardVerticalFirstAction,
+                           autoScrollBackwardVerticalFirstAction,
+                           moveDownAction,
+                           moveUpAction,
+                           moveLeftAction,
+                           moveRightAction,
+                           goToFirstPageAction,
+                           goToLastPageAction };
+    addActions(loadedComicActions);
 
     editShortcutsDialog->addActionsGroup(tr("Reading"), QIcon(":/images/shortcuts_group_reading.png"),
                                          tmpList = QList<QAction *>()
@@ -1287,18 +1317,7 @@ void MainWindowViewer::setUpShortcutsManagement()
                                                  << goToPageOnTheLeftAction
                                                  << setBookmarkAction
                                                  << showBookmarksAction
-                                                 << autoScrollForwardAction
-                                                 << autoScrollBackwardAction
-                                                 << autoScrollForwardHorizontalFirstAction
-                                                 << autoScrollBackwardHorizontalFirstAction
-                                                 << autoScrollForwardVerticalFirstAction
-                                                 << autoScrollBackwardVerticalFirstAction
-                                                 << moveDownAction
-                                                 << moveUpAction
-                                                 << moveLeftAction
-                                                 << moveRightAction
-                                                 << goToFirstPageAction
-                                                 << goToLastPageAction
+                                                 << loadedComicActions
                                                  << goToPageAction);
 
     allActions << tmpList;
@@ -1523,6 +1542,12 @@ void MainWindowViewer::setActionsEnabled(bool enabled)
         a->setEnabled(enabled);
 }
 
+void MainWindowViewer::setLoadedComicActionsEnabled(bool enabled)
+{
+    for (auto *a : std::as_const(loadedComicActions))
+        a->setEnabled(enabled);
+}
+
 void MainWindowViewer::dropEvent(QDropEvent *event)
 {
     QList<QUrl> urlList;

YACReader/main_window_viewer.h

@@ -148,6 +148,8 @@ private:
 
     QAction *showEditShortcutsAction;
 
+    QList<QAction *> loadedComicActions;
+
     YACReaderSlider *zoomSliderAction;
 
     HttpVersionChecker *versionChecker;
@@ -161,6 +163,7 @@ private:
     void clearRecentFiles();
     void getSiblingComics(QString path, QString currentComic);
     void setActionsEnabled(bool enabled);
+    void setLoadedComicActionsEnabled(bool enabled);
 
     //! Manejadores de evento:
     // void resizeEvent(QResizeEvent * event);

YACReader/viewer.cpp

@@ -178,6 +178,7 @@ void Viewer::createConnections()
     connect(render, &Render::crcError, this, &Viewer::processCRCError);
     connect(render, QOverload<unsigned int>::of(&Render::numPages), goToFlow, &GoToFlowWidget::setNumSlides);
     connect(render, QOverload<unsigned int>::of(&Render::numPages), goToDialog, &GoToDialog::setNumPages);
+    connect(render, qOverload<unsigned int>(&Render::numPages), this, &Viewer::comicLoaded);
     connect(render, QOverload<int, const QByteArray &>::of(&Render::imageLoaded), goToFlow, &GoToFlowWidget::setImageReady);
     connect(render, &Render::currentPageReady, this, &Viewer::updatePage);
     connect(render, &Render::processingPage, this, &Viewer::setLoadingMessage);
@@ -284,6 +285,14 @@ void Viewer::showGoToDialog()
 {
     goToDialog->open();
 }
+void Viewer::goToFirstPage()
+{
+    goTo(0);
+}
+void Viewer::goToLastPage()
+{
+    goTo(this->render->numPages() - 1);
+}
 void Viewer::goTo(unsigned int page)
 {
     direction = 1; // in "go to" direction is always fordward
@@ -456,6 +465,18 @@ void Viewer::scrollUp()
     }
 }
 
+void Viewer::scrollForward()
+{
+    nextPos = verticalScrollBar()->sliderPosition() + verticalScrollStep();
+    scrollDown();
+}
+
+void Viewer::scrollBackward()
+{
+    nextPos = verticalScrollBar()->sliderPosition() - verticalScrollStep();
+    scrollUp();
+}
+
 void Viewer::scrollForwardHorizontalFirst()
 {
     if (!doubleMangaPage) {
@@ -603,53 +624,7 @@ void Viewer::keyPressEvent(QKeyEvent *event)
             _key |= Qt::ALT;
 
         QKeySequence key(_key);
-        /*if(goToFlow->isVisible() && event->key()!=Qt::Key_S)
-                        QCoreApplication::sendEvent(goToFlow,event);
-                else*/
 
-        if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_ACTION_Y)) {
-            nextPos = verticalScrollBar()->sliderPosition() + verticalScrollStep();
-            scrollDown();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_ACTION_Y)) {
-            nextPos = verticalScrollBar()->sliderPosition() - verticalScrollStep();
-            scrollUp();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_HORIZONTAL_FIRST_ACTION_Y)) {
-            scrollForwardHorizontalFirst();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_HORIZONTAL_FIRST_ACTION_Y)) {
-            scrollBackwardHorizontalFirst();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_FORWARD_VERTICAL_FIRST_ACTION_Y)) {
-            scrollForwardVerticalFirst();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(AUTO_SCROLL_BACKWARD_VERTICAL_FIRST_ACTION_Y)) {
-            scrollBackwardVerticalFirst();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_DOWN_ACTION_Y) ||
-                 key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_UP_ACTION_Y) ||
-                 key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_LEFT_ACTION_Y) ||
-                 key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_RIGHT_ACTION_Y)) {
-            moveAction(key);
-            emit backgroundChanges();
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(GO_TO_FIRST_PAGE_ACTION_Y)) {
-            goTo(0);
-        }
-
-        else if (key == ShortcutsManager::getShortcutsManager().getShortcut(GO_TO_LAST_PAGE_ACTION_Y)) {
-            goTo(this->render->numPages() - 1);
-        }
-
-        else
         QAbstractScrollArea::keyPressEvent(event);
 
         if (mglass->isVisible() && (key == ShortcutsManager::getShortcutsManager().getShortcut(SIZE_UP_MGLASS_ACTION_Y) || key == ShortcutsManager::getShortcutsManager().getShortcut(SIZE_DOWN_MGLASS_ACTION_Y) || key == ShortcutsManager::getShortcutsManager().getShortcut(ZOOM_IN_MGLASS_ACTION_Y) || key == ShortcutsManager::getShortcutsManager().getShortcut(ZOOM_OUT_MGLASS_ACTION_Y))) {
@@ -660,24 +635,11 @@ void Viewer::keyPressEvent(QKeyEvent *event)
         QAbstractScrollArea::keyPressEvent(event);
 }
 
-void Viewer::moveAction(const QKeySequence &key)
+void Viewer::moveView(Qt::Key directionKey)
 {
-    int _key = 0;
-
-    if (key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_DOWN_ACTION_Y))
-        _key = Qt::Key_Down;
-
-    else if (key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_UP_ACTION_Y))
-        _key = Qt::Key_Up;
-
-    else if (key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_LEFT_ACTION_Y))
-        _key = Qt::Key_Left;
-
-    else if (key == ShortcutsManager::getShortcutsManager().getShortcut(MOVE_RIGHT_ACTION_Y))
-        _key = Qt::Key_Right;
-
-    QKeyEvent _event = QKeyEvent(QEvent::KeyPress, _key, Qt::NoModifier);
-    QAbstractScrollArea::keyPressEvent(&_event);
+    QKeyEvent event(QEvent::KeyPress, directionKey, Qt::NoModifier);
+    QAbstractScrollArea::keyPressEvent(&event);
+    emit backgroundChanges();
 }
 
 static void animateScroll(QPropertyAnimation &scroller, const QScrollBar &scrollBar, int delta)

YACReader/viewer.h

@@ -51,6 +51,8 @@ public slots:
     void left();
     void right();
     void showGoToDialog();
+    void goToFirstPage();
+    void goToLastPage();
     void goTo(unsigned int page);
     void updatePage();
     void updateContentSize();
@@ -58,6 +60,8 @@ public slots:
     void updateOptions();
     void scrollDown();
     void scrollUp();
+    void scrollForward();
+    void scrollBackward();
     void scrollForwardHorizontalFirst();
     void scrollBackwardHorizontalFirst();
     void scrollForwardVerticalFirst();
@@ -162,8 +166,6 @@ private:
     void wheelEvent(QWheelEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
 
-    void moveAction(const QKeySequence &key);
-
     int verticalScrollStep() const;
     int horizontalScrollStep() const;
 
@@ -185,10 +187,13 @@ public:
     // returns the current index starting in 1 [1,nPages]
     unsigned int getIndex();
     void updateComic(ComicDB &comic);
+    void moveView(Qt::Key directionKey);
+
 signals:
     void backgroundChanges();
     void pageAvailable(bool);
     void pageIsBookmark(bool);
+    void comicLoaded();
     void reset();
     void openNextComic();
     void openPreviousComic();