H/J/K/L mappings to pan to edges

Makefile

@@ -1,6 +1,6 @@
 all: sxiv
 
-VERSION=git-20110510
+VERSION=git-20110516
 
 CC?=gcc
 DESTDIR?=

image.c

@@ -293,6 +293,35 @@ int img_pan(img_t *img, win_t *win, pandir_t dir) {
 	return 0;
 }
 
+int img_pan_edge(img_t *img, win_t *win, pandir_t dir) {
+	int ox, oy;
+
+	if (!img || !img->im || !win)
+		return 0;
+
+	ox = img->x;
+	oy = img->y;
+
+	switch (dir) {
+		case PAN_LEFT:
+			img->x = 0;
+			break;
+		case PAN_RIGHT:
+			img->x = win->w - img->w * img->zoom;
+			break;
+		case PAN_UP:
+			img->y = 0;
+			break;
+		case PAN_DOWN:
+			img->y = win->h - img->h * img->zoom;
+			break;
+	}
+
+	img_check_pan(img, win);
+
+	return ox != img->x || oy != img->y;
+}
+
 void img_rotate(img_t *img, win_t *win, int d) {
 	int ox, oy, tmp;
 

image.h

@@ -69,6 +69,7 @@ int img_zoom_out(img_t*, win_t*);
 
 int img_move(img_t*, win_t*, int, int);
 int img_pan(img_t*, win_t*, pandir_t);
+int img_pan_edge(img_t*, win_t*, pandir_t);
 
 void img_rotate_left(img_t*, win_t*);
 void img_rotate_right(img_t*, win_t*);

main.c

@@ -455,6 +455,19 @@ void on_keypress(XKeyEvent *kev) {
 				changed = img_pan(&img, &win, PAN_RIGHT);
 				break;
 
+			case XK_H:
+				changed = img_pan_edge(&img, &win, PAN_LEFT);
+				break;
+			case XK_J:
+				changed = img_pan_edge(&img, &win, PAN_DOWN);
+				break;
+			case XK_K:
+				changed = img_pan_edge(&img, &win, PAN_UP);
+				break;
+			case XK_L:
+				changed = img_pan_edge(&img, &win, PAN_RIGHT);
+				break;
+
 			/* rotation */
 			case XK_less:
 				img_rotate_left(&img, &win);