input/seatop_default: refactor move/resize button logic

Make it so config->floating_mod_inverse only applies when pressing
mod, not when clicking on titlebars.

Centralize logic into shared variables.

sway/input/seatop_default.c

@@ -355,6 +355,13 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
 	uint32_t modifiers = keyboard ? wlr_keyboard_get_modifiers(keyboard) : 0;
 
+	bool mod_pressed = modifiers & config->floating_mod;
+	uint32_t mod_move_btn = config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT;
+	uint32_t mod_resize_btn = config->floating_mod_inverse ? BTN_LEFT : BTN_RIGHT;
+	bool mod_move_btn_pressed = mod_pressed && button == mod_move_btn;
+	bool mod_resize_btn_pressed = mod_pressed && button == mod_resize_btn;
+	bool titlebar_left_btn_pressed = on_titlebar && button == BTN_LEFT;
+
 	// Handle mouse bindings
 	if (trigger_pointer_button_binding(seat, device, button, state, modifiers,
 			on_titlebar, on_border, on_contents, on_workspace)) {
@@ -403,12 +410,8 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 	}
 
 	// Handle tiling resize via mod
-	bool mod_pressed = modifiers & config->floating_mod;
-	if (cont && !is_floating_or_child && mod_pressed &&
+	if (cont && !is_floating_or_child && mod_pressed && mod_resize_btn_pressed &&
 			state == WL_POINTER_BUTTON_STATE_PRESSED) {
-		uint32_t btn_resize = config->floating_mod_inverse ?
-			BTN_LEFT : BTN_RIGHT;
-		if (button == btn_resize) {
 		edge = 0;
 		edge |= cursor->cursor->x > cont->pending.x + cont->pending.width / 2 ?
 			WLR_EDGE_RIGHT : WLR_EDGE_LEFT;
@@ -430,7 +433,6 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 		seatop_begin_resize_tiling(seat, cont, edge);
 		return;
 	}
-	}
 
 	// Handle changing focus when clicking on a container
 	if (cont && state == WL_POINTER_BUTTON_STATE_PRESSED) {
@@ -454,13 +456,11 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 
 	// Handle beginning floating move
 	if (cont && is_floating_or_child && !is_fullscreen_or_child &&
-			state == WL_POINTER_BUTTON_STATE_PRESSED) {
-		uint32_t btn_move = config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT;
-		if (button == btn_move && (mod_pressed || on_titlebar)) {
+			state == WL_POINTER_BUTTON_STATE_PRESSED &&
+			(mod_move_btn_pressed || titlebar_left_btn_pressed)) {
 		seatop_begin_move_floating(seat, container_toplevel_ancestor(cont));
 		return;
 	}
-	}
 
 	// Handle beginning floating resize
 	if (cont && is_floating_or_child && !is_fullscreen_or_child &&
@@ -473,9 +473,7 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 		}
 
 		// Via mod+click
-		uint32_t btn_resize = config->floating_mod_inverse ?
-			BTN_LEFT : BTN_RIGHT;
-		if (mod_pressed && button == btn_resize) {
+		if (mod_resize_btn_pressed) {
 			struct sway_container *floater = container_toplevel_ancestor(cont);
 			edge = 0;
 			edge |= cursor->cursor->x > floater->pending.x + floater->pending.width / 2 ?
@@ -489,18 +487,15 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
 	}
 
 	// Handle moving a tiling container
-	if (config->tiling_drag && (mod_pressed || on_titlebar) &&
+	if (config->tiling_drag && (mod_move_btn_pressed || titlebar_left_btn_pressed) &&
 			state == WL_POINTER_BUTTON_STATE_PRESSED && !is_floating_or_child &&
-			cont && cont->pending.fullscreen_mode == FULLSCREEN_NONE &&
-			button == (config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT)) {
-
+			cont && cont->pending.fullscreen_mode == FULLSCREEN_NONE) {
 		// If moving a container by its title bar, use a threshold for the drag
 		if (!mod_pressed && config->tiling_drag_threshold > 0) {
 			seatop_begin_move_tiling_threshold(seat, cont);
 		} else {
 			seatop_begin_move_tiling(seat, cont);
 		}
-
 		return;
 	}