Add config option to set the default layout

doc/katarakt.txt

@@ -92,6 +92,8 @@ KEY BINDINGS
 
 VARIABLES
 ---------
+'string' *default_layout* ::
+	presentation: the layout on startup. Possible values: 'presentation', 'grid'
 'int' *mouse_wheel_factor* ::
 	120: QT delta for turning the mouse wheel 1 click
 'int' *smooth_scroll_delta* ::

share/katarakt.ini

 [Settings]
+default_layout=presentation
 mouse_wheel_factor=120
 smooth_scroll_delta=30
 screen_scroll_factor=0.9
@@ -48,3 +49,4 @@ rotate_right=I
 toggle_fullscreen=F
 close_search=Esc
 reload=R
+open=O

src/canvas.cpp

@@ -25,10 +25,16 @@ Canvas::Canvas(Viewer *v, QWidget *parent) :
 		valid(true) {
 	setFocusPolicy(Qt::StrongFocus);
 
-	layout = new PresentationLayout(viewer->get_res());
-
 	// load config options
 	CFG *config = CFG::get_instance();
+
+	QString default_layout = config->get_value("default_layout").toString();
+	if (default_layout == "grid") {
+		layout = new GridLayout(viewer->get_res());
+	} else { // "presentation" and everything else
+		layout = new PresentationLayout(viewer->get_res());
+	}
+
 	// apply start option
 	layout->scroll_page(config->get_tmp_value("start_page").toInt(), false);
 

src/config.cpp

@@ -8,6 +8,7 @@ CFG::CFG() :
 
 	settings.beginGroup("Settings");
 	// canvas options
+	defaults["default_layout"] = "presentation";
 	defaults["mouse_wheel_factor"] = 120; // (qt-)delta for turning the mouse wheel 1 click
 	defaults["smooth_scroll_delta"] = 30; // pixel scroll offset
 	defaults["screen_scroll_factor"] = 0.9; // creates overlap for scrolling 1 screen down, should be <= 1