minus zoom

src/ui.cpp

@@ -1,3 +1,4 @@
+#include "ui.hpp"
 #include "tree.hpp"
 #include "utils.hpp"
 #include "assert.h"
@@ -14,10 +15,22 @@ namespace
 	person_id selectRightSib(const Tree& t, person_id selected);
 }
 
+ZoomLevel operator++(ZoomLevel& z)
+{
+	z = (ZoomLevel)(z + 1);
+	return z;
+}
+
+ZoomLevel operator--(ZoomLevel& z)
+{
+	z = (ZoomLevel)(z - 1);
+	return z;
+}
+
 void displayTree(Tree& t)
 {
 	person_id selected = 0;	// the currently selected selected
-	U8 zoom = 0;		// how much info to show for each selected
+	ZoomLevel zoom = ZoomLevel::FIRST_NAME;		// how much info to show for each selected
 
 	// offset of the tree in relation to the top left corner of the screen
 	I16 offsetY = 0, offsetX = 0;
@@ -57,10 +70,12 @@ void displayTree(Tree& t)
 			break;
 		case '=':
 		case '+':
-			zoom = 1;
+			if(zoom < ZoomLevel::MAX_ZOOM)
+				++zoom;
 			break;
 		case '-':
-			zoom = 0;
+			if(zoom > 0)
+				--zoom;
 			break;
 		case SELECT_LEFT:
 			selected = selectLeft(t, selected);