feat: update action manager

- add and delete some actions in action manager.
- rename "fit to view" to "fit to screen".
- update main window right click menu and toolbar.
- use special state update slot in action manager instead of function located in main window.

app/graphicsview.cpp

@@ -140,7 +140,7 @@ void GraphicsView::resetTransform()
 
 void GraphicsView::zoomView(qreal scaleFactor)
 {
-    m_enableFitInView = false;
+    m_enableFitToScreen = false;
     scale(scaleFactor, scaleFactor);
     applyTransformationModeByScaleFactor();
     emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), transform());
@@ -223,6 +223,8 @@ void GraphicsView::fitByOrientation(Qt::Orientation ori, bool scaleDownOnly)
     // Position the image correctly based on orientation with rotation consideration
     QRectF originalScene = sceneRect();
     QTransform currentTransform = transform();
+    
+    // TODO: May be optimized by matrix arithmetic operation?
 
     if (ori == Qt::Horizontal) {
         // For horizontal fit (fit by width), position at top (for tall images)
@@ -276,7 +278,7 @@ void GraphicsView::fitByOrientation(Qt::Orientation ori, bool scaleDownOnly)
         centerOn(sceneLeftCenter);
     }
 
-    m_enableFitInView = false;
+    m_enableFitToScreen = false;
 
     applyTransformationModeByScaleFactor();
     emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), transform());
@@ -299,7 +301,7 @@ void GraphicsView::displayScene()
         emit navigatorViewRequired(false, transform());
     }
 
-    m_enableFitInView = true;
+    m_enableFitToScreen = true;
     m_firstUserMediaLoaded = true;
 }
 
@@ -313,9 +315,9 @@ bool GraphicsView::isSceneBiggerThanView() const
 }
 
 // Automately do fit in view when viewport(window) smaller than image original size.
-void GraphicsView::setEnableAutoFitInView(bool enable)
+void GraphicsView::setEnableAutoFitToScreen(bool enable)
 {
-    m_enableFitInView = enable;
+    m_enableFitToScreen = enable;
 }
 
 bool GraphicsView::avoidResetTransform() const
@@ -328,6 +330,15 @@ void GraphicsView::setAvoidResetTransform(bool avoidReset)
     m_avoidResetTransform = avoidReset;
 }
 
+bool GraphicsView::checkerboard() const {
+    return m_checkerboardEnabled;
+}
+
+void GraphicsView::toggleCheckerboard(bool invertCheckerboardColor)
+{
+    setCheckerboardEnabled(!m_checkerboardEnabled, invertCheckerboardColor);
+}
+
 inline double zeroOrOne(double number)
 {
     return qFuzzyIsNull(number) ? 0 : (number > 0 ? 1 : -1);
@@ -342,11 +353,6 @@ QTransform GraphicsView::resetScale(const QTransform & orig)
                       orig.dx(),             orig.dy());
 }
 
-void GraphicsView::toggleCheckerboard(bool invertCheckerboardColor)
-{
-    setCheckerboardEnabled(!m_checkerboardEnabled, invertCheckerboardColor);
-}
-
 void GraphicsView::updateStyle(Qt::ColorScheme colorScheme) {
     // YYC MARK:
     // If we are using Windows 10 and lower system or Qt which do not support "Windows 11"
@@ -423,11 +429,11 @@ void GraphicsView::wheelEvent(QWheelEvent *event)
 
 void GraphicsView::resizeEvent(QResizeEvent *event)
 {
-    if (m_enableFitInView) {
+    if (m_enableFitToScreen) {
         bool originalSizeSmallerThanWindow = isThingSmallerThanWindowWith(resetScale(transform()));
         if (originalSizeSmallerThanWindow && scaleFactor() >= 1) {
             // no longer need to do fitInView()
-            // but we leave the m_enableFitInView value unchanged in case
+            // but we leave the m_enableToScreen value unchanged in case
             // user resize down the window again.
         } else if (originalSizeSmallerThanWindow && scaleFactor() < 1) {
             resetScale();