Allow changing camera prefs (#3035)

* Check camera supported_features before streaming

* Allow mutating camera prefs

* Move when we fetch prefs

src/data/camera.ts

@@ -1,6 +1,13 @@
 import { HomeAssistant, CameraEntity } from "../types";
 import { timeCachePromiseFunc } from "../common/util/time-cache-function-promise";
 
+export const CAMERA_SUPPORT_ON_OFF = 1;
+export const CAMERA_SUPPORT_STREAM = 2;
+
+export interface CameraPreferences {
+  preload_stream: boolean;
+}
+
 export interface CameraThumbnail {
   content_type: string;
   content: string;
@@ -41,3 +48,22 @@ export const fetchStreamUrl = (
   }
   return hass.callWS<Stream>(data);
 };
+
+export const fetchCameraPrefs = (hass: HomeAssistant, entityId: string) =>
+  hass.callWS<CameraPreferences>({
+    type: "camera/get_prefs",
+    entity_id: entityId,
+  });
+
+export const updateCameraPrefs = (
+  hass: HomeAssistant,
+  entityId: string,
+  prefs: {
+    preload_stream?: boolean;
+  }
+) =>
+  hass.callWS<CameraPreferences>({
+    type: "camera/update_prefs",
+    entity_id: entityId,
+    ...prefs,
+  });

src/dialogs/more-info/controls/more-info-camera.ts

@@ -1,15 +1,36 @@
-import { property, UpdatingElement, PropertyValues } from "lit-element";
+import {
+  property,
+  PropertyValues,
+  LitElement,
+  TemplateResult,
+  html,
+  CSSResult,
+  css,
+} from "lit-element";
 
 import computeStateName from "../../../common/entity/compute_state_name";
 import { HomeAssistant, CameraEntity } from "../../../types";
 import { fireEvent } from "../../../common/dom/fire_event";
-import { fetchStreamUrl, computeMJPEGStreamUrl } from "../../../data/camera";
+import {
+  fetchStreamUrl,
+  computeMJPEGStreamUrl,
+  CAMERA_SUPPORT_STREAM,
+  CameraPreferences,
+  fetchCameraPrefs,
+  updateCameraPrefs,
+} from "../../../data/camera";
+import { supportsFeature } from "../../../common/entity/supports-feature";
+import "@polymer/paper-checkbox/paper-checkbox";
+// Not duplicate import, it's for typing
+// tslint:disable-next-line
+import { PaperCheckboxElement } from "@polymer/paper-checkbox/paper-checkbox";
 
 type HLSModule = typeof import("hls.js");
 
-class MoreInfoCamera extends UpdatingElement {
+class MoreInfoCamera extends LitElement {
   @property() public hass?: HomeAssistant;
   @property() public stateObj?: CameraEntity;
+  @property() private _cameraPrefs?: CameraPreferences;
   private _hlsPolyfillInstance?: Hls;
 
   public disconnectedCallback() {
@@ -17,6 +38,22 @@ class MoreInfoCamera extends UpdatingElement {
     this._teardownPlayback();
   }
 
+  protected render(): TemplateResult | void {
+    return html`
+      <div id="root"></div>
+      ${this._cameraPrefs
+        ? html`
+            <paper-checkbox
+              .checked=${this._cameraPrefs.preload_stream}
+              @change=${this._handleCheckboxChanged}
+            >
+              Preload stream
+            </paper-checkbox>
+          `
+        : undefined}
+    `;
+  }
+
   protected updated(changedProps: PropertyValues) {
     if (!changedProps.has("stateObj")) {
       return;
@@ -46,7 +83,10 @@ class MoreInfoCamera extends UpdatingElement {
       return;
     }
 
-    if (!this.hass!.config.components.includes("stream")) {
+    if (
+      !this.hass!.config.components.includes("stream") ||
+      !supportsFeature(this.stateObj, CAMERA_SUPPORT_STREAM)
+    ) {
       this._renderMJPEG();
       return;
     }
@@ -73,6 +113,8 @@ class MoreInfoCamera extends UpdatingElement {
           this.hass!,
           this.stateObj.entity_id
         );
+        // Fetch in background while we set up the video.
+        this._fetchCameraPrefs();
 
         if (Hls.isSupported()) {
           this._renderHLSPolyfill(videoEl, Hls, url);
@@ -81,16 +123,20 @@ class MoreInfoCamera extends UpdatingElement {
         }
         return;
       } catch (err) {
-        // Fails if entity doesn't support it. In that case we go
+        // When an error happens, we will do nothing so we render mjpeg.
-        // for mjpeg.
       }
     }
 
     this._renderMJPEG();
   }
 
+  private get _videoRoot(): HTMLDivElement {
+    return this.shadowRoot!.getElementById("root")! as HTMLDivElement;
+  }
+
   private async _renderHLSNative(videoEl: HTMLVideoElement, url: string) {
     videoEl.src = url;
+    this._videoRoot.appendChild(videoEl);
     await new Promise((resolve) =>
       videoEl.addEventListener("loadedmetadata", resolve)
     );
@@ -110,7 +156,7 @@ class MoreInfoCamera extends UpdatingElement {
       hls.attachMedia(videoEl);
     });
     hls.loadSource(url);
-    this.appendChild(videoEl);
+    this._videoRoot.appendChild(videoEl);
     videoEl.addEventListener("loadeddata", () =>
       fireEvent(this, "iron-resize")
     );
@@ -124,7 +170,7 @@ class MoreInfoCamera extends UpdatingElement {
       ? "/demo/webcamp.jpg"
       : computeMJPEGStreamUrl(this.stateObj!);
     img.alt = computeStateName(this.stateObj!);
-    this.appendChild(img);
+    this._videoRoot.appendChild(img);
   }
 
   private _teardownPlayback(): any {
@@ -132,11 +178,48 @@ class MoreInfoCamera extends UpdatingElement {
       this._hlsPolyfillInstance.destroy();
       this._hlsPolyfillInstance = undefined;
     }
-    while (this.lastChild) {
+    const root = this._videoRoot;
-      this.removeChild(this.lastChild);
+    while (root.lastChild) {
+      root.removeChild(root.lastChild);
     }
     this.stateObj = undefined;
   }
+
+  private async _fetchCameraPrefs() {
+    this._cameraPrefs = await fetchCameraPrefs(
+      this.hass!,
+      this.stateObj!.entity_id
+    );
+  }
+
+  private async _handleCheckboxChanged(ev) {
+    const checkbox = ev.currentTarget as PaperCheckboxElement;
+    try {
+      this._cameraPrefs = await updateCameraPrefs(
+        this.hass!,
+        this.stateObj!.entity_id,
+        {
+          preload_stream: checkbox.checked!,
+        }
+      );
+    } catch (err) {
+      alert(err.message);
+      checkbox.checked = !checkbox.checked;
+    }
+  }
+
+  static get styles(): CSSResult {
+    return css`
+      paper-checkbox {
+        position: absolute;
+        top: 0;
+        right: 0;
+        background-color: var(--secondary-background-color);
+        padding: 5px;
+        border-bottom-left-radius: 6px;
+      }
+    `;
+  }
 }
 
 customElements.define("more-info-camera", MoreInfoCamera);

src/dialogs/more-info/controls/more-info-content.ts

@@ -43,6 +43,7 @@ class MoreInfoContent extends UpdatingElement {
   }
 
   protected firstUpdated(): void {
+    this.style.position = "relative";
     this.style.display = "block";
   }