make thumbnail bindings configureable via config.h (#167)

this allows for configuring thumbnail mode mouse bindings similar to
image mode bindings.

however we can't put the thumbnails bindings into the existing buttons[]
array due to fallthrough. For example M3 would switch mode and then end
up selecting an image.

which is why thumbnail bindings have been put into it's own array
`buttons_tns[]` and `buttons[]` has been renamed to `buttons_img[]` for
consistency.

Closes: https://github.com/nsxiv/nsxiv/issues/131

4 files changed, 82 insertions, 53 deletions

diff --git a/commands.c b/commands.c
index a751c94..aafc510 100644
--- a/commands.c
+++ b/commands.c
@@ -42,6 +42,7 @@ extern appmode_t mode;
 extern img_t img;
 extern tns_t tns;
 extern win_t win;
+extern const XButtonEvent *xbutton_ev;
 
 extern fileinfo_t *files;
 extern int filecnt, fileidx;
@@ -436,3 +437,57 @@ bool ct_reload_all(arg_t _)
 	tns.dirty = true;
 	return true;
 }
+
+bool ct_scroll(arg_t dir)
+{
+	return tns_scroll(&tns, dir, false);
+}
+
+bool ct_drag_mark_image(arg_t _)
+{
+	int sel;
+
+	if ((sel = tns_translate(&tns, xbutton_ev->x, xbutton_ev->y)) >= 0) {
+		XEvent e;
+		bool on = !(files[sel].flags & FF_MARK);
+
+		while (true) {
+			if (sel >= 0 && mark_image(sel, on))
+				redraw();
+			XMaskEvent(win.env.dpy,
+			           ButtonPressMask | ButtonReleaseMask | PointerMotionMask, &e);
+			if (e.type == ButtonPress || e.type == ButtonRelease)
+				break;
+			while (XCheckTypedEvent(win.env.dpy, MotionNotify, &e));
+			sel = tns_translate(&tns, e.xbutton.x, e.xbutton.y);
+		}
+	}
+
+	return false;
+}
+
+bool ct_select(arg_t _)
+{
+	int sel;
+	bool dirty = false;
+	static Time firstclick;
+
+	if ((sel = tns_translate(&tns, xbutton_ev->x, xbutton_ev->y)) >= 0) {
+		if (sel != fileidx) {
+			tns_highlight(&tns, fileidx, false);
+			tns_highlight(&tns, sel, true);
+			fileidx = sel;
+			firstclick = xbutton_ev->time;
+			dirty = true;
+		} else if (xbutton_ev->time - firstclick <= TO_DOUBLE_CLICK) {
+			mode = MODE_IMAGE;
+			set_timeout(reset_cursor, TO_CURSOR_HIDE, true);
+			load_image(fileidx);
+			dirty = true;
+		} else {
+			firstclick = xbutton_ev->time;
+		}
+	}
+
+	return dirty;
+}
diff --git a/commands.h b/commands.h
index 8935f22..70af13a 100644
--- a/commands.h
+++ b/commands.h
@@ -39,6 +39,9 @@ bool ci_toggle_antialias(arg_t);
 /* thumbnails mode */
 bool ct_move_sel(arg_t);
 bool ct_reload_all(arg_t);
+bool ct_scroll(arg_t);
+bool ct_drag_mark_image(arg_t);
+bool ct_select(arg_t);
 
 /* global */
 #define g_change_gamma { cg_change_gamma, MODE_ALL }
@@ -79,5 +82,8 @@ bool ct_reload_all(arg_t);
 /* thumbnails mode */
 #define t_move_sel { ct_move_sel, MODE_THUMB }
 #define t_reload_all { ct_reload_all, MODE_THUMB }
+#define t_scroll { ct_scroll, MODE_THUMB }
+#define t_drag_mark_image { ct_drag_mark_image, MODE_THUMB }
+#define t_select { ct_select, MODE_THUMB }
 
 #endif /* COMMANDS_H */
diff --git a/config.def.h b/config.def.h
index 6e4b942..b328305 100644
--- a/config.def.h
+++ b/config.def.h
@@ -175,7 +175,7 @@ static const keymap_t keys[] = {
 };
 
 /* mouse button mappings for image mode: */
-static const button_t buttons[] = {
+static const button_t buttons_img[] = {
 	/* modifiers    button            function              argument */
 	{ 0,            1,                i_cursor_navigate,    None },
 	{ ControlMask,  1,                i_drag,               DRAG_RELATIVE },
@@ -185,6 +185,17 @@ static const button_t buttons[] = {
 	{ 0,            5,                g_zoom,               -1 },
 };
 
+/* mouse button mappings for thumbnail mode: */
+static const button_t buttons_tns[] = {
+	/* modifiers    button            function              argument */
+	{ 0,            1,                t_select,             None },
+	{ 0,            3,                t_drag_mark_image,    None },
+	{ 0,            4,                t_scroll,             DIR_UP },
+	{ 0,            5,                t_scroll,             DIR_DOWN },
+	{ ControlMask,  4,                g_scroll_screen,      DIR_UP },
+	{ ControlMask,  5,                g_scroll_screen,      DIR_DOWN },
+};
+
 /* true means NAV_WIDTH is relative (33%), false means absolute (33 pixels) */
 static const bool NAV_IS_REL = true;
 /* width of navigation area, 0 disables cursor navigation, */
diff --git a/main.c b/main.c
index f8c727f..efedfc6 100644
--- a/main.c
+++ b/main.c
@@ -57,6 +57,7 @@ arl_t arl;
 img_t img;
 tns_t tns;
 win_t win;
+const XButtonEvent *xbutton_ev;
 
 fileinfo_t *files;
 int filecnt, fileidx;
@@ -661,64 +662,19 @@ static void on_keypress(XKeyEvent *kev)
 	prefix = 0;
 }
 
-static void on_buttonpress(XButtonEvent *bev)
+static void on_buttonpress(const XButtonEvent *bev)
 {
-	int sel;
 	bool dirty = false;
-	static Time firstclick;
 
 	if (mode == MODE_IMAGE) {
 		set_timeout(reset_cursor, TO_CURSOR_HIDE, true);
 		reset_cursor();
-		dirty = process_bindings(buttons, ARRLEN(buttons), bev->button, bev->state, 0);
-		if (dirty)
-			redraw();
-	} else {
-		/* thumbnail mode (hard-coded) */
-		switch (bev->button) {
-			case Button1:
-				if ((sel = tns_translate(&tns, bev->x, bev->y)) >= 0) {
-					if (sel != fileidx) {
-						tns_highlight(&tns, fileidx, false);
-						tns_highlight(&tns, sel, true);
-						fileidx = sel;
-						firstclick = bev->time;
-						redraw();
-					} else if (bev->time - firstclick <= TO_DOUBLE_CLICK) {
-						mode = MODE_IMAGE;
-						set_timeout(reset_cursor, TO_CURSOR_HIDE, true);
-						load_image(fileidx);
-						redraw();
-					} else {
-						firstclick = bev->time;
-					}
-				}
-				break;
-			case Button3:
-				if ((sel = tns_translate(&tns, bev->x, bev->y)) >= 0) {
-					bool on = !(files[sel].flags & FF_MARK);
-					XEvent e;
-
-					while (true) {
-						if (sel >= 0 && mark_image(sel, on))
-							redraw();
-						XMaskEvent(win.env.dpy,
-						           ButtonPressMask | ButtonReleaseMask | PointerMotionMask, &e);
-						if (e.type == ButtonPress || e.type == ButtonRelease)
-							break;
-						while (XCheckTypedEvent(win.env.dpy, MotionNotify, &e));
-						sel = tns_translate(&tns, e.xbutton.x, e.xbutton.y);
-					}
-				}
-				break;
-			case Button4:
-			case Button5:
-				if (tns_scroll(&tns, bev->button == Button4 ? DIR_UP : DIR_DOWN,
-				               (bev->state & ControlMask) != 0))
-					redraw();
-				break;
-		}
+		dirty = process_bindings(buttons_img, ARRLEN(buttons_img), bev->button, bev->state, 0);
+	} else { /* thumbnail mode */
+		dirty = process_bindings(buttons_tns, ARRLEN(buttons_tns), bev->button, bev->state, 0);
 	}
+	if (dirty)
+		redraw();
 	prefix = 0;
 }
 
@@ -731,13 +687,14 @@ static void run(void)
 	bool discard, init_thumb, load_thumb, to_set;
 	XEvent ev, nextev;
 
+	xbutton_ev = &ev.xbutton;
 	while (true) {
 		to_set = check_timeouts(&timeout);
 		init_thumb = mode == MODE_THUMB && tns.initnext < filecnt;
 		load_thumb = mode == MODE_THUMB && tns.loadnext < tns.end;
 
 		if ((init_thumb || load_thumb || to_set || info.fd != -1 ||
-			   arl.fd != -1) && XPending(win.env.dpy) == 0)
+		     arl.fd != -1) && XPending(win.env.dpy) == 0)
 		{
 			if (load_thumb) {
 				set_timeout(redraw, TO_REDRAW_THUMBS, false);