Add fixed background support in iOS and improve the way we set view background (#22531)

* Add fixed background support in iOS and improve the way we set view background

* Fix cast

cast/src/launcher/layout/hc-cast.ts

@@ -1,5 +1,6 @@
 import "@material/mwc-button/mwc-button";
-import { ActionDetail } from "@material/mwc-list/mwc-list";
+import "@material/mwc-list/mwc-list";
+import type { ActionDetail } from "@material/mwc-list/mwc-list";
 import { mdiCast, mdiCastConnected, mdiViewDashboard } from "@mdi/js";
 import { Auth, Connection } from "home-assistant-js-websocket";
 import { CSSResultGroup, LitElement, TemplateResult, css, html } from "lit";
@@ -89,8 +90,8 @@ class HcCast extends LitElement {
                       generateDefaultViewConfig({}, {}, {}, {}, () => ""),
                     ]
                   ).map(
-                    (view, idx) =>
-                      html`<ha-list-item
+                    (view, idx) => html`
+                      <ha-list-item
                         graphic="avatar"
                         .activated=${this.castManager.status?.lovelacePath ===
                         (view.path ?? idx)}
@@ -108,8 +109,9 @@ class HcCast extends LitElement {
                           : html`<ha-svg-icon
                               slot="item-icon"
                               .path=${mdiViewDashboard}
-                            ></ha-svg-icon>`}</ha-list-item
-                      > `
+                            ></ha-svg-icon>`}
+                      </ha-list-item>
+                    `
                   )}</mwc-list
                 >
               `}

cast/src/receiver/layout/hc-lovelace.ts

@@ -1,10 +1,11 @@
 import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
-import { customElement, property, query } from "lit/decorators";
+import { customElement, property } from "lit/decorators";
 import { fireEvent } from "../../../../src/common/dom/fire_event";
 import { LovelaceConfig } from "../../../../src/data/lovelace/config/types";
 import { getPanelTitleFromUrlPath } from "../../../../src/data/panel";
 import { Lovelace } from "../../../../src/panels/lovelace/types";
 import "../../../../src/panels/lovelace/views/hui-view";
+import "../../../../src/panels/lovelace/views/hui-view-container";
 import { HomeAssistant } from "../../../../src/types";
 import "./hc-launch-screen";
 
@@ -22,8 +23,6 @@ class HcLovelace extends LitElement {
 
   @property() public urlPath: string | null = null;
 
-  @query("hui-view") private _huiView?: HTMLElement;
-
   protected render(): TemplateResult {
     const index = this._viewIndex;
     if (index === undefined) {
@@ -47,12 +46,22 @@ class HcLovelace extends LitElement {
       setEditMode: () => undefined,
       showToast: () => undefined,
     };
+
+    const viewConfig = this.lovelaceConfig.views[index];
+    const background = viewConfig.background || this.lovelaceConfig.background;
+
     return html`
-      <hui-view
+      <hui-view-container
         .hass=${this.hass}
-        .lovelace=${lovelace}
-        .index=${index}
-      ></hui-view>
+        .background=${background}
+        .theme=${viewConfig.theme}
+      >
+        <hui-view
+          .hass=${this.hass}
+          .lovelace=${lovelace}
+          .index=${index}
+        ></hui-view>
+      </hui-view-container>
     `;
   }
 
@@ -82,26 +91,6 @@ class HcLovelace extends LitElement {
                 }${viewTitle || ""}`
               : undefined,
         });
-
-        const configBackground =
-          this.lovelaceConfig.views[index].background ||
-          this.lovelaceConfig.background;
-
-        const backgroundStyle =
-          typeof configBackground === "string"
-            ? configBackground
-            : configBackground?.image
-              ? `center / cover no-repeat url('${configBackground.image}')`
-              : undefined;
-
-        if (backgroundStyle) {
-          this._huiView!.style.setProperty(
-            "--lovelace-background",
-            backgroundStyle
-          );
-        } else {
-          this._huiView!.style.removeProperty("--lovelace-background");
-        }
       }
     }
   }
@@ -125,19 +114,15 @@ class HcLovelace extends LitElement {
 
   static get styles(): CSSResultGroup {
     return css`
-      :host {
-        min-height: 100vh;
-        height: 0;
+      hui-view-container {
         display: flex;
-        flex-direction: column;
+        position: relative;
+        min-height: 100vh;
         box-sizing: border-box;
-        background: var(--primary-background-color);
-      }
-      :host > * {
-        flex: 1;
       }
       hui-view {
-        background: var(--lovelace-background, var(--primary-background-color));
+        flex: 1 1 100%;
+        max-width: 100%;
       }
     `;
   }