Improved key handling in swaylock

Make escape clear buffer
Add indicator states for ctrl,shift,super et al
Add CapsLock indicator

include/swaylock/seat.h

@@ -27,6 +27,7 @@ enum mask {
 
 struct swaylock_xkb {
 	uint32_t modifiers;
+	bool caps_lock;
 	struct xkb_state *state;
 	struct xkb_context *context;
 	struct xkb_keymap *keymap;

include/swaylock/swaylock.h

@@ -11,7 +11,9 @@
 
 enum auth_state {
     AUTH_STATE_IDLE,
+    AUTH_STATE_CLEAR,
     AUTH_STATE_INPUT,
+    AUTH_STATE_INPUT_NOP,
     AUTH_STATE_BACKSPACE,
     AUTH_STATE_VALIDATING,
     AUTH_STATE_INVALID,

swaylock/password.c

@@ -105,11 +105,39 @@ void swaylock_handle_key(struct swaylock_state *state,
 			state->auth_state = AUTH_STATE_INVALID;
 			render_frames(state);
 			break;
+		case XKB_KEY_Delete:
 		case XKB_KEY_BackSpace:
 			if (backspace(&state->password)) {
 				state->auth_state = AUTH_STATE_BACKSPACE;
-				render_frames(state);
+			} else {
+				state->auth_state = AUTH_STATE_CLEAR;
 			}
+			render_frames(state);
+			break;
+		case XKB_KEY_Escape: 
+			clear_password_buffer(&state->password);
+			state->auth_state = AUTH_STATE_CLEAR;
+			render_frames(state);
+			break;
+		case XKB_KEY_Caps_Lock:
+			/* The state is getting active after this
+			 * so we need to manually toggle it */
+			state->xkb.caps_lock = !state->xkb.caps_lock;
+			state->auth_state = AUTH_STATE_INPUT_NOP;
+			render_frames(state);
+			break;
+		case XKB_KEY_Shift_L:
+		case XKB_KEY_Shift_R:
+		case XKB_KEY_Control_L:
+		case XKB_KEY_Control_R:
+		case XKB_KEY_Meta_L:
+		case XKB_KEY_Meta_R:
+		case XKB_KEY_Alt_L:
+		case XKB_KEY_Alt_R:
+		case XKB_KEY_Super_L:
+		case XKB_KEY_Super_R:
+			state->auth_state = AUTH_STATE_INPUT_NOP;
+			render_frames(state);
 			break;
 		default:
 			if (codepoint) {

swaylock/render.c

@@ -43,6 +43,7 @@ void render_frame(struct swaylock_surface *surface) {
 		cairo_arc(cairo, buffer_width / 2, buffer_height / 2, arc_radius, 0, 2 * M_PI);
 		switch (state->auth_state) {
 		case AUTH_STATE_INPUT:
+		case AUTH_STATE_INPUT_NOP:
 		case AUTH_STATE_BACKSPACE: {
 			cairo_set_source_rgba(cairo, 0, 0, 0, 0.75);
 			cairo_fill_preserve(cairo);
@@ -61,6 +62,12 @@ void render_frame(struct swaylock_surface *surface) {
 			cairo_set_source_rgb(cairo, 125.0 / 255, 51.0 / 255, 0);
 			cairo_stroke(cairo);
 		} break;
+		case AUTH_STATE_CLEAR: {
+			cairo_set_source_rgba(cairo, 229.0/255, 164.0/255, 69.0/255, 0.75);
+			cairo_fill_preserve(cairo);
+			cairo_set_source_rgb(cairo, 229.0/255, 164.0/255, 69.0/255);
+			cairo_stroke(cairo);
+		} break;
 		default: break;
 		}
 
@@ -77,6 +84,15 @@ void render_frame(struct swaylock_surface *surface) {
 		case AUTH_STATE_INVALID:
 			text = "wrong";
 			break;
+		case AUTH_STATE_CLEAR:
+			text = "cleared";
+			break;
+		case AUTH_STATE_INPUT:
+		case AUTH_STATE_INPUT_NOP:
+			if (state->xkb.caps_lock) {
+				text = "Caps Lock";
+				cairo_set_source_rgb(cairo, 229.0/255, 164.0/255, 69.0/255);
+			}
 		default: break;
 		}
 

swaylock/seat.c

@@ -88,6 +88,7 @@ static void keyboard_modifiers(void *data, struct wl_keyboard *wl_keyboard,
 	xkb_mod_mask_t mask = xkb_state_serialize_mods(state->xkb.state,
 			XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
 	state->xkb.modifiers = 0;
+	state->xkb.caps_lock = xkb_state_mod_name_is_active(state->xkb.state, XKB_MOD_NAME_CAPS, XKB_STATE_MODS_LOCKED);
 	for (uint32_t i = 0; i < MASK_LAST; ++i) {
 		if (mask & state->xkb.masks[i]) {
 			state->xkb.modifiers |= XKB_MODS[i];