Added shortcut option for Fade Previous Steps. Fixes #420.

common/lc_commands.cpp

@@ -1060,6 +1060,13 @@ lcCommand gCommands[LC_NUM_COMMANDS] =
 		QT_TRANSLATE_NOOP("Status", "Toggle the view sphere"),
 		""
 	},
+	// LC_VIEW_FADE_PREVIOUS_STEPS
+	{
+		QT_TRANSLATE_NOOP("Action", "View.FadePreviousSteps"),
+		QT_TRANSLATE_NOOP("Menu", "Fade Previous Steps"),
+		QT_TRANSLATE_NOOP("Status", "Toggle fading previous model steps"),
+		""
+	},
 	// LC_PIECE_INSERT
 	{
 		QT_TRANSLATE_NOOP("Action", "Piece.Insert"),

common/lc_commands.h

@@ -165,6 +165,7 @@ enum lcCommandId
 	LC_VIEW_PROJECTION_ORTHO,
 	LC_VIEW_PROJECTION_LAST = LC_VIEW_PROJECTION_ORTHO,
 	LC_VIEW_TOGGLE_VIEW_SPHERE,
+	LC_VIEW_FADE_PREVIOUS_STEPS,
 	LC_PIECE_INSERT,
 	LC_PIECE_DELETE,
 	LC_PIECE_DUPLICATE,

common/lc_mainwindow.cpp

@@ -1237,6 +1237,13 @@ void lcMainWindow::ToggleViewSphere()
 	UpdateAllViews();
 }
 
+void lcMainWindow::ToggleFadePreviousSteps()
+{
+	lcGetPreferences().mFadeSteps = !lcGetPreferences().mFadeSteps;
+
+	UpdateAllViews();
+}
+
 QByteArray lcMainWindow::GetTabLayout()
 {
 	QByteArray TabLayoutData;
@@ -2661,6 +2668,10 @@ void lcMainWindow::HandleCommand(lcCommandId CommandId)
 		ToggleViewSphere();
 		break;
 
+	case LC_VIEW_FADE_PREVIOUS_STEPS:
+		ToggleFadePreviousSteps();
+		break;
+
 	case LC_PIECE_INSERT:
 		if (ActiveModel)
 			ActiveModel->AddPiece();

common/lc_mainwindow.h

@@ -290,6 +290,7 @@ public:
 	void SetShadingMode(lcShadingMode ShadingMode);
 	void SetSelectionMode(lcSelectionMode SelectionMode);
 	void ToggleViewSphere();
+	void ToggleFadePreviousSteps();
 
 	void NewProject();
 	bool OpenProject(const QString& FileName);