feat: touch map to monitor

Author: DreamMaoMao

docs/configuration/input.md

@@ -83,6 +83,7 @@ emulation so the touchscreen keeps working with non-touch clients.
 | :--- | :--- | :--- |
 | `touch_enable` | `1` | Set to `0` to completely disable touchscreen support. |
 | `touch_enable_mouse_emulation` | `0` | When `1`, touch events landing on surfaces that do not accept touch are emulated as left mouse button clicks/moves. Set to `0` to disable emulation (such touches are ignored). |
+| `touch_map_to_mon` | *(unset)* | Restrict a touchscreen to one output. Accepts a [monitor spec](/docs/configuration/monitors#monitor-spec-format). Leave unset to map the touchscreen to the whole output layout. Useful on multi-monitor setups where the touchscreen would otherwise be stretched across all outputs. |
 
 ---
 

src/common/log.c

@@ -1,9 +1,9 @@
 #define _GNU_SOURCE
 #include "log.h"
+#include "util.h"
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include "util.h"
 
 void mango_log_init(enum wlr_log_importance verbosity,
 					wlr_log_func_t callback) {

src/config/parse_config.h

@@ -353,6 +353,7 @@ typedef struct {
 	/* touch */
 	int32_t touch_enable;
 	int32_t touch_enable_mouse_emulation;
+	char *touch_map_to_mon;
 
 	/* window effects */
 	int32_t blur;
@@ -1924,6 +1925,10 @@ bool parse_option(Config *config, char *key, char *value, int line_number) {
 		config->touch_enable = atoi(value);
 	} else if (strcmp(key, "touch_enable_mouse_emulation") == 0) {
 		config->touch_enable_mouse_emulation = atoi(value);
+	} else if (strcmp(key, "touch_map_to_mon") == 0) {
+		if (config->touch_map_to_mon)
+			free(config->touch_map_to_mon);
+		config->touch_map_to_mon = value[0] ? strdup(value) : NULL;
 	} else if (strcmp(key, "tap_to_click") == 0) {
 		config->tap_to_click = atoi(value);
 	} else if (strcmp(key, "tap_and_drag") == 0) {
@@ -3906,6 +3911,11 @@ void free_config(void) {
 		config.tablet_map_to_mon = NULL;
 	}
 
+	if (config.touch_map_to_mon) {
+		free(config.touch_map_to_mon);
+		config.touch_map_to_mon = NULL;
+	}
+
 	if (config.jump_labels) {
 		free(config.jump_labels);
 		config.jump_labels = NULL;
@@ -4473,6 +4483,7 @@ bool parse_config(void) {
 	config.jumplabeldata.font_desc = NULL;
 	config.groupbardata.font_desc = NULL;
 	config.tablet_map_to_mon = NULL;
+	config.touch_map_to_mon = NULL;
 	config.jump_labels = NULL;
 	strcpy(config.keymode, "default");
 

src/input/touch.h

@@ -40,6 +40,23 @@ static struct wl_listener cursor_touch_cancel = {.notify = touch_cancel};
 static struct wl_listener cursor_touch_motion = {.notify = touch_motion};
 static struct wl_listener cursor_touch_frame = {.notify = touch_frame};
 
+// 将触摸设备映射到 touch_map_to_mon 指定的显示器。
+// 支持热插拔输出和配置重载，每次触摸按下时重新应用。
+static void touch_apply_monitor_mapping(struct wlr_touch *touch) {
+	if (!config.touch_map_to_mon)
+		return;
+
+	Monitor *m = NULL;
+	wl_list_for_each(m, &mons, link) {
+		if (match_monitor_spec(config.touch_map_to_mon, m)) {
+			wlr_cursor_map_input_to_output(cursor, &touch->base, m->wlr_output);
+			mango_error(true, WLR_DEBUG, "Mapping touch %s to output %s",
+						touch->base.name, config.touch_map_to_mon);
+			return;
+		}
+	}
+}
+
 void createtouch(struct wlr_touch *touch) {
 	struct libinput_device *device = NULL;
 
@@ -50,6 +67,7 @@ void createtouch(struct wlr_touch *touch) {
 				device, config.send_events_mode);
 	}
 	wlr_cursor_attach_input_device(cursor, &touch->base);
+	touch_apply_monitor_mapping(touch);
 }
 
 void touch_point_surface_destroy(struct wl_listener *listener, void *data) {
@@ -133,6 +151,8 @@ void touch_down(struct wl_listener *listener, void *data) {
 		return;
 	}
 
+	touch_apply_monitor_mapping(event->touch);
+
 	wlr_idle_notifier_v1_notify_activity(idle_notifier, seat);
 
 	point->surface = touch_get_coords(event->touch, event->x, event->y,