Parse mouse binding options

First, the existing sway_binding structure is given an
enumerated type code. As all flags to bindsym/bindcode
are boolean, a single uint32 is used to hold all flags.
The _BORDER, _CONTENTS, _TITLEBAR flags, when active,
indicate in which part of a container the binding can
trigger; to localize complexity, they do not overlap
with the command line arguments, which center around
_TITLEBAR being set by default.

The keyboard handling code is adjusted for this change,
as is binding_key_compare; note that BINDING_LOCKED
is *not* part of the key portion of the binding.

Next, list of mouse bindings is introduced and cleaned up.

Finally, the binding command parsing code is extended
to handle the case where bindsym is used to describe
a mouse binding rather than a keysym binding; the
difference between the two may be detected as late as
when the first key/button is parsed, or as early as
the first flag.  As bindings can have multiple
keycodes/keysyms/buttons, mixed keysym/button sequences
are prohibited.

include/sway/config.h

@@ -22,14 +22,28 @@ struct sway_variable {
 	char *value;
 };
 
+
+enum binding_input_type {
+	BINDING_KEYCODE,
+	BINDING_KEYSYM,
+	BINDING_MOUSE,
+};
+
+enum binding_flags {
+	BINDING_RELEASE=1,
+	BINDING_LOCKED=2, // keyboard only
+	BINDING_BORDER=4, // mouse only; trigger on container border
+	BINDING_CONTENTS=8, // mouse only; trigger on container contents
+	BINDING_TITLEBAR=16 // mouse only; trigger on container titlebar
+};
+
 /**
  * A key binding and an associated command.
  */
 struct sway_binding {
+	enum binding_input_type type;
 	int order;
-	bool release;
-	bool locked;
-	bool bindcode;
+	uint32_t flags;
 	list_t *keys; // sorted in ascending order
 	uint32_t modifiers;
 	char *command;
@@ -50,6 +64,7 @@ struct sway_mode {
 	char *name;
 	list_t *keysym_bindings;
 	list_t *keycode_bindings;
+	list_t *mouse_bindings;
 	bool pango;
 };
 

sway/commands/bind.c

@@ -34,11 +34,14 @@ void free_sway_binding(struct sway_binding *binding) {
  */
 static bool binding_key_compare(struct sway_binding *binding_a,
 		struct sway_binding *binding_b) {
-	if (binding_a->release != binding_b->release) {
+	if (binding_a->type != binding_b->type) {
 		return false;
 	}
 
-	if (binding_a->bindcode != binding_b->bindcode) {
+	uint32_t conflict_generating_flags = BINDING_RELEASE | BINDING_BORDER
+			| BINDING_CONTENTS | BINDING_TITLEBAR;
+	if ((binding_a->flags & conflict_generating_flags) !=
+			(binding_b->flags & conflict_generating_flags)) {
 		return false;
 	}
 
@@ -69,6 +72,66 @@ static int key_qsort_cmp(const void *keyp_a, const void *keyp_b) {
 	return (key_a < key_b) ? -1 : ((key_a > key_b) ? 1 : 0);
 }
 
+
+/**
+ * From a keycode, bindcode, or bindsym name and the most likely binding type,
+ * identify the appropriate numeric value corresponding to the key. Return NULL
+ * and set *key_val if successful, otherwise return a specific error. Change
+ * the value of *type if the initial type guess was incorrect and if this
+ * was the first identified key.
+ */
+static struct cmd_results *identify_key(const char* name, bool first_key,
+		uint32_t* key_val, enum binding_input_type* type) {
+	if (*type == BINDING_KEYCODE) {
+		// check for keycode
+		xkb_keycode_t keycode = strtol(name, NULL, 10);
+		if (!xkb_keycode_is_legal_ext(keycode)) {
+			return cmd_results_new(CMD_INVALID, "bindcode",
+					"Invalid keycode '%s'", name);
+		}
+		*key_val = keycode;
+	} else {
+		// check for keysym
+		xkb_keysym_t keysym = xkb_keysym_from_name(name,
+				XKB_KEYSYM_CASE_INSENSITIVE);
+
+		// Check for mouse binding
+		uint32_t button = 0;
+		if (strncasecmp(name, "button", strlen("button")) == 0 &&
+				strlen(name) == strlen("button0")) {
+			button = name[strlen("button")] - '1' + BTN_LEFT;
+		}
+
+		if (*type == BINDING_KEYSYM) {
+			if (button) {
+				if (first_key) {
+					*type = BINDING_MOUSE;
+					*key_val = button;
+				} else {
+					return cmd_results_new(CMD_INVALID, "bindsym",
+							"Mixed button '%s' into key sequence", name);
+				}
+			} else if (keysym) {
+				*key_val = keysym;
+			} else {
+				return cmd_results_new(CMD_INVALID, "bindsym",
+						"Unknown key '%s'", name);
+			}
+		} else {
+			if (button) {
+				*key_val = button;
+			} else if (keysym) {
+				return cmd_results_new(CMD_INVALID, "bindsym",
+						"Mixed keysym '%s' into button sequence", name);
+			} else {
+				return cmd_results_new(CMD_INVALID, "bindsym",
+						"Unknown button '%s'", name);
+			}
+		}
+	}
+	return NULL;
+}
+
 static struct cmd_results *cmd_bindsym_or_bindcode(int argc, char **argv,
 		bool bindcode) {
 	const char *bindtype = bindcode ? "bindcode" : "bindsym";
@@ -85,22 +148,34 @@ static struct cmd_results *cmd_bindsym_or_bindcode(int argc, char **argv,
 	}
 	binding->keys = create_list();
 	binding->modifiers = 0;
-	binding->release = false;
-	binding->locked = false;
-	binding->bindcode = bindcode;
+	binding->flags = 0;
+	binding->type = bindcode ? BINDING_KEYCODE : BINDING_KEYSYM;
+
+	bool exclude_titlebar = false;
 
 	// Handle --release and --locked
 	while (argc > 0) {
 		if (strcmp("--release", argv[0]) == 0) {
-			binding->release = true;
+			binding->flags |= BINDING_RELEASE;
 		} else if (strcmp("--locked", argv[0]) == 0) {
-			binding->locked = true;
+			binding->flags |= BINDING_LOCKED;
+		} else if (strcmp("--whole-window", argv[0]) == 0) {
+			binding->flags |= BINDING_BORDER | BINDING_CONTENTS | BINDING_TITLEBAR;
+		} else if (strcmp("--border", argv[0]) == 0) {
+			binding->flags |= BINDING_BORDER;
+		} else if (strcmp("--exclude-titlebar", argv[0]) == 0) {
+			exclude_titlebar = true;
 		} else {
 			break;
 		}
 		argv++;
 		argc--;
 	}
+	if (binding->flags & (BINDING_BORDER | BINDING_CONTENTS | BINDING_TITLEBAR)
+			|| exclude_titlebar) {
+		binding->type = BINDING_MOUSE;
+	}
+
 	if (argc < 2) {
 		free_sway_binding(binding);
 		return cmd_results_new(CMD_FAILURE, bindtype,
@@ -119,64 +194,47 @@ static struct cmd_results *cmd_bindsym_or_bindcode(int argc, char **argv,
 			continue;
 		}
 
-		xkb_keycode_t keycode;
-		xkb_keysym_t keysym;
-		if (bindcode) {
-			// parse keycode
-			keycode = (int)strtol(split->items[i], NULL, 10);
-			if (!xkb_keycode_is_legal_ext(keycode)) {
-				error =
-					cmd_results_new(CMD_INVALID, "bindcode",
-						"Invalid keycode '%s'", (char *)split->items[i]);
+		// Identify the key and possibly change binding->type
+		uint32_t key_val = 0;
+		error = identify_key(split->items[i], binding->keys->length == 0,
+				     &key_val, &binding->type);
+		if (error) {
 			free_sway_binding(binding);
 			list_free(split);
 			return error;
 		}
-		} else {
-			// Check for xkb key
-			 keysym = xkb_keysym_from_name(split->items[i],
-					XKB_KEYSYM_CASE_INSENSITIVE);
 
-			// Check for mouse binding
-			if (strncasecmp(split->items[i], "button", strlen("button")) == 0 &&
-					strlen(split->items[i]) == strlen("button0")) {
-				keysym = ((char *)split->items[i])[strlen("button")] - '1' + BTN_LEFT;
-			}
-			if (!keysym) {
-				struct cmd_results *ret = cmd_results_new(CMD_INVALID, "bindsym",
-						"Unknown key '%s'", (char *)split->items[i]);
-				free_sway_binding(binding);
-				free_flat_list(split);
-				return ret;
-			}
-		}
 		uint32_t *key = calloc(1, sizeof(uint32_t));
 		if (!key) {
 			free_sway_binding(binding);
 			free_flat_list(split);
 			return cmd_results_new(CMD_FAILURE, bindtype,
-					"Unable to allocate binding");
+					"Unable to allocate binding key");
 		}
-
-		if (bindcode) {
-			*key = (uint32_t)keycode;
-		} else {
-			*key = (uint32_t)keysym;
-		}
-
+		*key = key_val;
 		list_add(binding->keys, key);
 	}
 	free_flat_list(split);
 	binding->order = binding_order++;
 
+	// refine region of interest for mouse binding once we are certain
+	// that this is one
+	if (exclude_titlebar) {
+		binding->flags &= ~BINDING_TITLEBAR;
+	} else if (binding->type == BINDING_MOUSE) {
+		binding->flags |= BINDING_TITLEBAR;
+	}
+
 	// sort ascending
 	list_qsort(binding->keys, key_qsort_cmp);
 
 	list_t *mode_bindings;
-	if (bindcode) {
+	if (binding->type == BINDING_KEYCODE) {
 		mode_bindings = config->current_mode->keycode_bindings;
-	} else {
+	} else if (binding->type == BINDING_KEYSYM) {
 		mode_bindings = config->current_mode->keysym_bindings;
+	} else {
+		mode_bindings = config->current_mode->mouse_bindings;
 	}
 
 	// overwrite the binding if it already exists

sway/config.c

@@ -56,6 +56,12 @@ static void free_mode(struct sway_mode *mode) {
 		}
 		list_free(mode->keycode_bindings);
 	}
+	if (mode->mouse_bindings) {
+		for (i = 0; i < mode->mouse_bindings->length; i++) {
+			free_sway_binding(mode->mouse_bindings->items[i]);
+		}
+		list_free(mode->mouse_bindings);
+	}
 	free(mode);
 }
 
@@ -172,6 +178,7 @@ static void config_defaults(struct sway_config *config) {
 	strcpy(config->current_mode->name, "default");
 	if (!(config->current_mode->keysym_bindings = create_list())) goto cleanup;
 	if (!(config->current_mode->keycode_bindings = create_list())) goto cleanup;
+	if (!(config->current_mode->mouse_bindings = create_list())) goto cleanup;
 	list_add(config->modes, config->current_mode);
 
 	config->floating_mod = 0;

sway/input/keyboard.c

@@ -88,11 +88,13 @@ static void get_active_binding(const struct sway_shortcut_state *state,
 		uint32_t modifiers, bool release, bool locked) {
 	for (int i = 0; i < bindings->length; ++i) {
 		struct sway_binding *binding = bindings->items[i];
+		bool binding_locked = binding->flags | BINDING_LOCKED;
+		bool binding_release = binding->flags | BINDING_RELEASE;
 
 		if (modifiers ^ binding->modifiers ||
 				state->npressed != (size_t)binding->keys->length ||
-				locked > binding->locked ||
-				release != binding->release) {
+				release != binding_release ||
+				locked > binding_locked) {
 			continue;
 		}