Merge pull request #2303 from frsfnrrg/mouse-bindings

Implement mouse bindings

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;
 };
 
@@ -482,6 +497,8 @@ void free_sway_binding(struct sway_binding *sb);
 
 struct sway_binding *sway_binding_dup(struct sway_binding *sb);
 
+void seat_execute_command(struct sway_seat *seat, struct sway_binding *binding);
+
 void load_swaybars();
 
 void invoke_swaybar(struct bar_config *bar);

include/sway/input/cursor.h

@@ -3,6 +3,8 @@
 #include <stdint.h>
 #include "sway/input/seat.h"
 
+#define SWAY_CURSOR_PRESSED_BUTTONS_CAP 32
+
 struct sway_cursor {
 	struct sway_seat *seat;
 	struct wlr_cursor *cursor;
@@ -29,6 +31,10 @@ struct sway_cursor {
 	uint32_t tool_buttons;
 
 	struct wl_listener request_set_cursor;
+
+	// Mouse binding state
+	uint32_t pressed_buttons[SWAY_CURSOR_PRESSED_BUTTONS_CAP];
+	size_t pressed_button_count;
 };
 
 void sway_cursor_destroy(struct sway_cursor *cursor);

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");
-		}
-
-		if (bindcode) {
-			*key = (uint32_t)keycode;
-		} else {
-			*key = (uint32_t)keysym;
+					"Unable to allocate binding key");
 		}
-
+		*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
@@ -209,3 +267,19 @@ struct cmd_results *cmd_bindsym(int argc, char **argv) {
 struct cmd_results *cmd_bindcode(int argc, char **argv) {
 	return cmd_bindsym_or_bindcode(argc, argv, true);
 }
+
+
+/**
+ * Execute the command associated to a binding
+ */
+void seat_execute_command(struct sway_seat *seat, struct sway_binding *binding) {
+	wlr_log(WLR_DEBUG, "running command for binding: %s",
+		binding->command);
+	config->handler_context.seat = seat;
+	struct cmd_results *results = execute_command(binding->command, NULL);
+	if (results->status != CMD_SUCCESS) {
+		wlr_log(WLR_DEBUG, "could not run command for binding: %s (%s)",
+			binding->command, results->error);
+	}
+	free_cmd_results(results);
+}

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/cursor.c

@@ -469,6 +469,83 @@ static void dispatch_cursor_button_floating(struct sway_cursor *cursor,
 	seat_pointer_notify_button(seat, time_msec, button, state);
 }
 
+/**
+ * Remove a button (and duplicates) to the sorted list of currently pressed buttons
+ */
+static void state_erase_button(struct sway_cursor *cursor, uint32_t button) {
+	size_t j = 0;
+	for (size_t i = 0; i < cursor->pressed_button_count; ++i) {
+		if (i > j) {
+			cursor->pressed_buttons[j] = cursor->pressed_buttons[i];
+		}
+		if (cursor->pressed_buttons[i] != button) {
+			++j;
+		}
+	}
+	while (cursor->pressed_button_count > j) {
+		--cursor->pressed_button_count;
+		cursor->pressed_buttons[cursor->pressed_button_count] = 0;
+	}
+}
+
+/**
+ * Add a button to the sorted list of currently pressed buttons, if there
+ * is space.
+ */
+static void state_add_button(struct sway_cursor *cursor, uint32_t button) {
+	if (cursor->pressed_button_count >= SWAY_CURSOR_PRESSED_BUTTONS_CAP) {
+		return;
+	}
+	size_t i = 0;
+	while (i < cursor->pressed_button_count && cursor->pressed_buttons[i] < button) {
+		++i;
+	}
+	size_t j = cursor->pressed_button_count;
+	while (j > i) {
+		cursor->pressed_buttons[j] = cursor->pressed_buttons[j - 1];
+		--j;
+	}
+	cursor->pressed_buttons[i] = button;
+	cursor->pressed_button_count++;
+}
+
+/**
+ * Return the mouse binding which matches modifier, click location, release,
+ * and pressed button state, otherwise return null.
+ */
+static struct sway_binding* get_active_mouse_binding(const struct sway_cursor *cursor,
+		list_t *bindings, uint32_t modifiers, bool release, bool on_titlebar,
+				     bool on_border, bool on_content) {
+	uint32_t click_region = (on_titlebar ? BINDING_TITLEBAR : 0) |
+			(on_border ? BINDING_BORDER : 0) |
+			(on_content ? BINDING_CONTENTS : 0);
+
+	for (int i = 0; i < bindings->length; ++i) {
+		struct sway_binding *binding = bindings->items[i];
+		if (modifiers ^ binding->modifiers ||
+				cursor->pressed_button_count != (size_t)binding->keys->length ||
+				release != (binding->flags & BINDING_RELEASE) ||
+				!(click_region & binding->flags)) {
+			continue;
+		}
+
+		bool match = true;
+		for (size_t j = 0; j < cursor->pressed_button_count; j++) {
+			uint32_t key = *(uint32_t *)binding->keys->items[j];
+			if (key != cursor->pressed_buttons[j]) {
+				match = false;
+				break;
+			}
+		}
+		if (!match) {
+			continue;
+		}
+
+		return binding;
+	}
+	return NULL;
+}
+
 void dispatch_cursor_button(struct sway_cursor *cursor,
 		uint32_t time_msec, uint32_t button, enum wlr_button_state state) {
 	if (cursor->seat->operation != OP_NONE &&
@@ -485,6 +562,31 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	double sx, sy;
 	struct sway_container *cont = container_at_coords(cursor->seat,
 			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
+
+	// Handle mouse bindings
+	bool on_border = find_resize_edge(cont, cursor) != WLR_EDGE_NONE;
+	bool on_contents = !on_border && surface;
+	bool on_titlebar = !on_border && !surface;
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(cursor->seat->wlr_seat);
+	uint32_t modifiers = keyboard ? wlr_keyboard_get_modifiers(keyboard) : 0;
+
+	struct sway_binding *binding = NULL;
+	if (state == WLR_BUTTON_PRESSED) {
+		state_add_button(cursor, button);
+		binding = get_active_mouse_binding(cursor,
+			config->current_mode->mouse_bindings, modifiers, false,
+			on_titlebar, on_border, on_contents);
+	} else {
+		binding = get_active_mouse_binding(cursor,
+			config->current_mode->mouse_bindings, modifiers, true,
+			on_titlebar, on_border, on_contents);
+		state_erase_button(cursor, button);
+	}
+	if (binding) {
+		seat_execute_command(cursor->seat, binding);
+		// TODO: do we want to pass on the event?
+	}
+
 	if (surface && wlr_surface_is_layer_surface(surface)) {
 		struct wlr_layer_surface *layer =
 			wlr_layer_surface_from_wlr_surface(surface);

sway/input/keyboard.c

@@ -3,11 +3,11 @@
 #include <wlr/backend/multi.h>
 #include <wlr/backend/session.h>
 #include <wlr/types/wlr_idle.h>
+#include "sway/commands.h"
 #include "sway/desktop/transaction.h"
-#include "sway/input/seat.h"
-#include "sway/input/keyboard.h"
 #include "sway/input/input-manager.h"
-#include "sway/commands.h"
+#include "sway/input/keyboard.h"
+#include "sway/input/seat.h"
 #include "log.h"
 
 /**
@@ -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;
 		}
 
@@ -118,23 +120,6 @@ static void get_active_binding(const struct sway_shortcut_state *state,
 	}
 }
 
-/**
- * Execute the command associated to a binding
- */
-static void keyboard_execute_command(struct sway_keyboard *keyboard,
-		struct sway_binding *binding) {
-	wlr_log(WLR_DEBUG, "running command for binding: %s",
-		binding->command);
-	config->handler_context.seat = keyboard->seat_device->sway_seat;
-	struct cmd_results *results = execute_command(binding->command, NULL);
-	transaction_commit_dirty();
-	if (results->status != CMD_SUCCESS) {
-		wlr_log(WLR_DEBUG, "could not run command for binding: %s (%s)",
-			binding->command, results->error);
-	}
-	free_cmd_results(results);
-}
-
 /**
  * Execute a built-in, hardcoded compositor binding. These are triggered from a
  * single keysym.
@@ -211,12 +196,13 @@ static size_t keyboard_keysyms_raw(struct sway_keyboard *keyboard,
 static void handle_keyboard_key(struct wl_listener *listener, void *data) {
 	struct sway_keyboard *keyboard =
 		wl_container_of(listener, keyboard, keyboard_key);
-	struct wlr_seat *wlr_seat = keyboard->seat_device->sway_seat->wlr_seat;
+	struct sway_seat* seat = keyboard->seat_device->sway_seat;
+	struct wlr_seat *wlr_seat = seat->wlr_seat;
 	struct wlr_input_device *wlr_device =
 		keyboard->seat_device->input_device->wlr_device;
-	wlr_idle_notify_activity(keyboard->seat_device->sway_seat->input->server->idle, wlr_seat);
+	wlr_idle_notify_activity(seat->input->server->idle, wlr_seat);
 	struct wlr_event_keyboard_key *event = data;
-	bool input_inhibited = keyboard->seat_device->sway_seat->exclusive_client != NULL;
+	bool input_inhibited = seat->exclusive_client != NULL;
 
 	// Identify new keycode, raw keysym(s), and translated keysym(s)
 	xkb_keycode_t keycode = event->keycode + 8;
@@ -266,7 +252,7 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
 	// Execute stored release binding once no longer active
 	if (keyboard->held_binding && binding_released != keyboard->held_binding &&
 			event->state == WLR_KEY_RELEASED) {
-		keyboard_execute_command(keyboard, keyboard->held_binding);
+		seat_execute_command(seat, keyboard->held_binding);
 		handled = true;
 	}
 	if (binding_released != keyboard->held_binding) {
@@ -290,7 +276,7 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
 				raw_modifiers, false, input_inhibited);
 
 		if (binding_pressed) {
-			keyboard_execute_command(keyboard, binding_pressed);
+			seat_execute_command(seat, binding_pressed);
 			handled = true;
 		}
 	}
@@ -312,6 +298,8 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
 		wlr_seat_keyboard_notify_key(wlr_seat, event->time_msec,
 				event->keycode, event->state);
 	}
+
+	transaction_commit_dirty();
 }
 
 static void handle_keyboard_modifiers(struct wl_listener *listener,