Show triggered in automation editor

src/common/util/debounce.ts

@@ -11,7 +11,7 @@ export const debounce = <T extends any[]>(
   immediate = false
 ) => {
   let timeout: number | undefined;
-  return (...args: T): void => {
+  const debouncedFunc = (...args: T): void => {
     const later = () => {
       timeout = undefined;
       if (!immediate) {
@@ -25,4 +25,8 @@ export const debounce = <T extends any[]>(
       func(...args);
     }
   };
+  debouncedFunc.cancel = () => {
+    clearTimeout(timeout);
+  };
+  return debouncedFunc;
 };

src/data/config.ts

@@ -0,0 +1,19 @@
+import { HomeAssistant } from "../types";
+
+interface ValidationResult {
+  valid: boolean;
+  error: string | null;
+}
+
+type ValidKeys = "trigger" | "action" | "condition";
+
+export const validateConfig = <
+  T extends Partial<{ [key in ValidKeys]: unknown }>
+>(
+  hass: HomeAssistant,
+  config: T
+): Promise<Record<keyof T, ValidationResult>> =>
+  hass.callWS({
+    type: "validate_config",
+    ...config,
+  });

src/panels/config/automation/trigger/ha-automation-trigger-row.ts

@@ -1,11 +1,13 @@
+import type { UnsubscribeFunc } from "home-assistant-js-websocket";
 import { ActionDetail } from "@material/mwc-list/mwc-list-foundation";
 import "@material/mwc-list/mwc-list-item";
 import { mdiDotsVertical } from "@mdi/js";
 import "@material/mwc-select";
 import type { Select } from "@material/mwc-select";
-import { css, CSSResultGroup, html, LitElement } from "lit";
+import { css, CSSResultGroup, html, LitElement, PropertyValues } from "lit";
 import { customElement, property, state } from "lit/decorators";
 import memoizeOne from "memoize-one";
+import { classMap } from "lit/directives/class-map";
 import { dynamicElement } from "../../../../common/dom/dynamic-element-directive";
 import { fireEvent } from "../../../../common/dom/fire_event";
 import { stringCompare } from "../../../../common/string/compare";
@@ -16,7 +18,7 @@ import "../../../../components/ha-card";
 import "../../../../components/ha-alert";
 import "../../../../components/ha-textfield";
 import "../../../../components/ha-icon-button";
-import type { Trigger } from "../../../../data/automation";
+import { subscribeTrigger, Trigger } from "../../../../data/automation";
 import { showConfirmationDialog } from "../../../../dialogs/generic/show-dialog-box";
 import { haStyle } from "../../../../resources/styles";
 import type { HomeAssistant } from "../../../../types";
@@ -34,6 +36,8 @@ import "./types/ha-automation-trigger-time";
 import "./types/ha-automation-trigger-time_pattern";
 import "./types/ha-automation-trigger-webhook";
 import "./types/ha-automation-trigger-zone";
+import { debounce } from "../../../../common/util/debounce";
+import { validateConfig } from "../../../../data/config";
 
 const OPTIONS = [
   "device",
@@ -90,6 +94,12 @@ export default class HaAutomationTriggerRow extends LitElement {
 
   @state() private _requestShowId = false;
 
+  @state() private _triggered = false;
+
+  @state() private _triggerColor = false;
+
+  private _triggerUnsub?: Promise<UnsubscribeFunc>;
+
   private _processedTypes = memoizeOne(
     (localize: LocalizeFunc): [string, string][] =>
       OPTIONS.map(
@@ -219,10 +229,98 @@ export default class HaAutomationTriggerRow extends LitElement {
                 </div>
               `}
         </div>
+        <div
+          class="triggered ${classMap({
+            active: this._triggered,
+            accent: this._triggerColor,
+          })}"
+        >
+          ${this.hass.localize(
+            "ui.panel.config.automation.editor.triggers.triggered"
+          )}
+        </div>
       </ha-card>
     `;
   }
 
+  protected override updated(changedProps: PropertyValues): void {
+    super.updated(changedProps);
+    if (changedProps.has("trigger")) {
+      this._subscribeTrigger();
+    }
+  }
+
+  public connectedCallback(): void {
+    super.connectedCallback();
+    if (this.hasUpdated && this.trigger) {
+      this._subscribeTrigger();
+    }
+  }
+
+  public disconnectedCallback(): void {
+    super.disconnectedCallback();
+    if (this._triggerUnsub) {
+      this._triggerUnsub.then((unsub) => unsub());
+      this._triggerUnsub = undefined;
+    }
+    this._doSubscribeTrigger.cancel();
+  }
+
+  private _subscribeTrigger() {
+    // Clean up old trigger subscription.
+    if (this._triggerUnsub) {
+      this._triggerUnsub.then((unsub) => unsub());
+      this._triggerUnsub = undefined;
+    }
+
+    this._doSubscribeTrigger();
+  }
+
+  private _doSubscribeTrigger = debounce(async () => {
+    let untriggerTimeout: number | undefined;
+    const showTriggeredTime = 5000;
+    const trigger = this.trigger;
+
+    // Clean up old trigger subscription.
+    if (this._triggerUnsub) {
+      this._triggerUnsub.then((unsub) => unsub());
+      this._triggerUnsub = undefined;
+    }
+
+    const validateResult = await validateConfig(this.hass, {
+      trigger: this.trigger,
+    });
+
+    // Don't do anything if trigger not valid or if trigger changed.
+    if (!validateResult.trigger.valid || this.trigger !== trigger) {
+      return;
+    }
+
+    const triggerUnsub = subscribeTrigger(
+      this.hass,
+      () => {
+        if (untriggerTimeout !== undefined) {
+          clearTimeout(untriggerTimeout);
+          this._triggerColor = !this._triggerColor;
+        } else {
+          this._triggerColor = false;
+        }
+        this._triggered = true;
+        untriggerTimeout = window.setTimeout(() => {
+          this._triggered = false;
+          untriggerTimeout = undefined;
+        }, showTriggeredTime);
+      },
+      trigger
+    );
+    triggerUnsub.catch(() => {
+      if (this._triggerUnsub === triggerUnsub) {
+        this._triggerUnsub = undefined;
+      }
+    });
+    this._triggerUnsub = triggerUnsub;
+  }, 5000);
+
   private _handleUiModeNotAvailable(ev: CustomEvent) {
     this._warnings = handleStructError(this.hass, ev.detail).warnings;
     if (!this._yamlMode) {
@@ -327,6 +425,31 @@ export default class HaAutomationTriggerRow extends LitElement {
           z-index: 3;
           --mdc-theme-text-primary-on-background: var(--primary-text-color);
         }
+        .triggered {
+          position: absolute;
+          top: 0px;
+          right: 0px;
+          left: 0px;
+          text-transform: uppercase;
+          pointer-events: none;
+          font-weight: bold;
+          font-size: 14px;
+          background-color: var(--primary-color);
+          color: var(--text-primary-color);
+          max-height: 0px;
+          overflow: hidden;
+          transition: max-height 0.3s;
+          text-align: center;
+          border-top-right-radius: var(--ha-card-border-radius, 4px);
+          border-top-left-radius: var(--ha-card-border-radius, 4px);
+        }
+        .triggered.active {
+          max-height: 100px;
+        }
+        .triggered.accent {
+          background-color: var(--accent-color);
+          color: var(--text-accent-color, var(--text-primary-color));
+        }
         .rtl .card-menu {
           float: left;
         }

src/translations/en.json

@@ -1622,6 +1622,7 @@
               "header": "Triggers",
               "introduction": "Triggers are what starts the processing of an automation rule. It is possible to specify multiple triggers for the same rule. Once a trigger starts, Home Assistant will validate the conditions, if any, and call the action.",
               "learn_more": "Learn more about triggers",
+              "triggered": "Triggered",
               "add": "Add trigger",
               "id": "Trigger ID",
               "edit_id": "Edit trigger ID",