add on_key trigger to matrix_keypad (#7830)

Co-authored-by: Samuel Sieb <samuel@sieb.net>

esphome/components/matrix_keypad/__init__.py

@@ -1,8 +1,8 @@
+from esphome import automation, pins
 import esphome.codegen as cg
-import esphome.config_validation as cv
-from esphome import pins
 from esphome.components import key_provider
-from esphome.const import CONF_ID, CONF_PIN
+import esphome.config_validation as cv
+from esphome.const import CONF_ID, CONF_ON_KEY, CONF_PIN, CONF_TRIGGER_ID
 
 CODEOWNERS = ["@ssieb"]
 
@@ -14,6 +14,9 @@ matrix_keypad_ns = cg.esphome_ns.namespace("matrix_keypad")
 MatrixKeypad = matrix_keypad_ns.class_(
     "MatrixKeypad", key_provider.KeyProvider, cg.Component
 )
+MatrixKeyTrigger = matrix_keypad_ns.class_(
+    "MatrixKeyTrigger", automation.Trigger.template(cg.uint8)
+)
 
 CONF_KEYPAD_ID = "keypad_id"
 CONF_ROWS = "rows"
@@ -47,6 +50,11 @@ CONFIG_SCHEMA = cv.All(
             cv.Optional(CONF_DEBOUNCE_TIME, default=1): cv.int_range(min=1, max=100),
             cv.Optional(CONF_HAS_DIODES): cv.boolean,
             cv.Optional(CONF_HAS_PULLDOWNS): cv.boolean,
+            cv.Optional(CONF_ON_KEY): automation.validate_automation(
+                {
+                    cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(MatrixKeyTrigger),
+                }
+            ),
         }
     ),
     check_keys,
@@ -73,3 +81,7 @@ async def to_code(config):
         cg.add(var.set_has_diodes(config[CONF_HAS_DIODES]))
     if CONF_HAS_PULLDOWNS in config:
         cg.add(var.set_has_pulldowns(config[CONF_HAS_PULLDOWNS]))
+    for conf in config.get(CONF_ON_KEY, []):
+        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID])
+        cg.add(var.register_key_trigger(trigger))
+        await automation.build_automation(trigger, [(cg.uint8, "x")], conf)