Select and open thumbnails

main.c

@@ -268,7 +268,7 @@ void redraw() {
 }
 
 void on_keypress(XKeyEvent *kev) {
-	int x, y;
+	int sel, x, y;
 	unsigned int w, h;
 	char key;
 	KeySym ksym;
@@ -388,6 +388,36 @@ void on_keypress(XKeyEvent *kev) {
 				break;
 		}
 	} else {
+		/* thumbnail mode */
+		sel = tns.sel;
+
+		switch (ksym) {
+			/* open selected image */
+			case XK_Return:
+				fileidx = sel;
+				load_image();
+				mode = MODE_NORMAL;
+				changed = 1;
+				break;
+
+			/* move selection */
+			case XK_h:
+			case XK_Left:
+				tns_move_selection(&tns, &win, MOVE_LEFT);
+				break;
+			case XK_j:
+			case XK_Down:
+				tns_move_selection(&tns, &win, MOVE_DOWN);
+				break;
+			case XK_k:
+			case XK_Up:
+				tns_move_selection(&tns, &win, MOVE_UP);
+				break;
+			case XK_l:
+			case XK_Right:
+				tns_move_selection(&tns, &win, MOVE_RIGHT);
+				break;
+		}
 	}
 
 	/* common key mappings */

thumbs.c

@@ -115,7 +115,6 @@ void tns_render(tns_t *tns, win_t *win) {
 	}
 
 	tns_highlight(tns, win, -1);
-	win_draw(win);
 }
 
 void tns_highlight(tns_t *tns, win_t *win, int old) {
@@ -132,4 +131,42 @@ void tns_highlight(tns_t *tns, win_t *win, int old) {
 		t = &tns->thumbs[tns->sel];
 		win_draw_rect(win, t->x - 2, t->y - 2, t->w + 4, t->h + 4, True);
 	}
+
+	win_draw(win);
+}
+
+void tns_move_selection(tns_t *tns, win_t *win, movedir_t dir) {
+	int sel;
+
+	if (!tns || !win)
+		return;
+
+	sel = tns->sel;
+
+	switch (dir) {
+		case MOVE_LEFT:
+			if (sel % tns->cols > 0) {
+				--tns->sel;
+				tns_highlight(tns, win, sel);
+			}
+			break;
+		case MOVE_RIGHT:
+			if (sel % tns->cols < tns->cols - 1 && sel < tns->cnt - 1) {
+				++tns->sel;
+				tns_highlight(tns, win, sel);
+			}
+			break;
+		case MOVE_UP:
+			if (sel / tns->cols > 0) {
+				tns->sel -= tns->cols;
+				tns_highlight(tns, win, sel);
+			}
+			break;
+		case MOVE_DOWN:
+			if (sel / tns->cols < tns->rows - 1 && sel + tns->cols < tns->cnt) {
+				tns->sel += tns->cols;
+				tns_highlight(tns, win, sel);
+			}
+			break;
+	}
 }

thumbs.h

@@ -21,6 +21,13 @@
 
 #include "window.h"
 
+typedef enum movedir_e {
+	MOVE_LEFT = 0,
+	MOVE_RIGHT,
+	MOVE_UP,
+	MOVE_DOWN
+} movedir_t;
+
 typedef struct thumb_s {
 	Pixmap pm;
 	int x;
@@ -48,4 +55,6 @@ void tns_load(tns_t*, win_t*, const char*);
 void tns_render(tns_t*, win_t*);
 void tns_highlight(tns_t*, win_t*, int);
 
+void tns_move_selection(tns_t*, win_t*, movedir_t);
+
 #endif /* THUMBS_H */