Add shortcuts to control the double page mode offset

YACReader/main_window_viewer.cpp

@@ -1252,6 +1252,11 @@ void MainWindowViewer::setUpShortcutsManagement()
     auto *const goToLastPageAction = addActionWithShortcut(tr("Go to the last page"), GO_TO_LAST_PAGE_ACTION_Y);
     connect(goToLastPageAction, &QAction::triggered, viewer, &Viewer::goToLastPage);
 
+    auto *const offsetDoublePageToTheLeft = addActionWithShortcut(tr("Offset double page to the left"), OFFSET_DOUBLE_PAGE_TO_THE_LEFT_Y);
+    connect(offsetDoublePageToTheLeft, &QAction::triggered, viewer, &Viewer::offsetDoublePageToTheLeft);
+    auto *const offsetDoublePageToTheRight = addActionWithShortcut(tr("Offset double page to the right"), OFFSET_DOUBLE_PAGE_TO_THE_RIGHT_Y);
+    connect(offsetDoublePageToTheRight, &QAction::triggered, viewer, &Viewer::offsetDoublePageToTheRight);
+
     loadedComicActions = { autoScrollForwardAction,
                            autoScrollBackwardAction,
                            autoScrollForwardHorizontalFirstAction,
@@ -1263,7 +1268,9 @@ void MainWindowViewer::setUpShortcutsManagement()
                            moveLeftAction,
                            moveRightAction,
                            goToFirstPageAction,
-                           goToLastPageAction };
+                           goToLastPageAction,
+                           offsetDoublePageToTheLeft,
+                           offsetDoublePageToTheRight };
 
     editShortcutsDialog->addActionsGroup(tr("Reading"), QIcon(":/images/shortcuts_group_reading.svg"),
                                          tmpList = QList<QAction *>()

YACReader/viewer.cpp

@@ -1083,6 +1083,36 @@ void Viewer::setBookmarks()
     bd->setBookmarks(*render->getBookmarks());
 }
 
+void Viewer::offsetDoublePageToTheLeft()
+{
+    if (!doublePage) {
+        return;
+    }
+
+    if (doubleMangaPage) {
+        render->previousPage();
+    } else {
+        render->nextPage();
+    }
+
+    updateInformation();
+}
+
+void Viewer::offsetDoublePageToTheRight()
+{
+    if (!doublePage) {
+        return;
+    }
+
+    if (doubleMangaPage) {
+        render->nextPage();
+    } else {
+        render->previousPage();
+    }
+
+    updateInformation();
+}
+
 void Viewer::showIsCoverMessage()
 {
     if (!shouldOpenPrevious) {

YACReader/viewer.h

@@ -101,6 +101,8 @@ public slots:
     void showMessageErrorOpening(QString);
     void processCRCError(QString message);
     void setBookmarks();
+    void offsetDoublePageToTheLeft();
+    void offsetDoublePageToTheRight();
     // deprecated
     void updateImageOptions();
     void updateFilters(int brightness, int contrast, int gamma);

shortcuts_management/shortcuts_manager.cpp

@@ -69,6 +69,8 @@ void ShortcutsManager::initDefaultShorcuts()
     defaultShorcuts.insert(MOVE_UP_ACTION_Y, Qt::Key_Up);
     defaultShorcuts.insert(GO_TO_FIRST_PAGE_ACTION_Y, Qt::Key_Home);
     defaultShorcuts.insert(GO_TO_LAST_PAGE_ACTION_Y, Qt::Key_End);
+    defaultShorcuts.insert(OFFSET_DOUBLE_PAGE_TO_THE_LEFT_Y, Qt::CTRL | Qt::SHIFT | Qt::Key_Left);
+    defaultShorcuts.insert(OFFSET_DOUBLE_PAGE_TO_THE_RIGHT_Y, Qt::CTRL | Qt::SHIFT | Qt::Key_Right);
     // mglass
     defaultShorcuts.insert(SIZE_UP_MGLASS_ACTION_Y, Qt::Key_Plus);
     defaultShorcuts.insert(SIZE_DOWN_MGLASS_ACTION_Y, Qt::Key_Minus);

shortcuts_management/shortcuts_manager.h

@@ -152,6 +152,8 @@ public:
 #define MOVE_RIGHT_ACTION_Y "MOVE_RIGHT_ACTION_Y"
 #define GO_TO_FIRST_PAGE_ACTION_Y "GO_TO_FIRST_PAGE_ACTION_Y"
 #define GO_TO_LAST_PAGE_ACTION_Y "GO_TO_LAST_PAGE_ACTION_Y"
+#define OFFSET_DOUBLE_PAGE_TO_THE_LEFT_Y "OFFSET_DOUBLE_PAGE_TO_THE_LEFT_Y"
+#define OFFSET_DOUBLE_PAGE_TO_THE_RIGHT_Y "OFFSET_DOUBLE_PAGE_TO_THE_RIGHT_Y"
 // mglass
 #define SIZE_UP_MGLASS_ACTION_Y "SIZE_UP_MGLASS_ACTION_Y"
 #define SIZE_DOWN_MGLASS_ACTION_Y "SIZE_DOWN_MGLASS_ACTION_Y"