Add preview to edit LL card (#1929)

src/panels/lovelace/components/hui-card-options.ts

@@ -21,8 +21,8 @@ export class HuiCardOptions extends LitElement {
       registeredDialog = true;
       fireEvent(this, "register-dialog", {
         dialogShowEvent: "show-edit-card",
-        dialogTag: "ha-dialog-edit-card",
-        dialogImport: () => import("./ha-dialog-edit-card"),
+        dialogTag: "hui-dialog-edit-card",
+        dialogImport: () => import("../editor/hui-dialog-edit-card"),
       });
     }
   }

src/panels/lovelace/editor/hui-dialog-edit-card.ts

@@ -3,6 +3,7 @@ import { fireEvent } from "../../../common/dom/fire_event.js";
 
 import "@polymer/paper-button/paper-button.js";
 import "@polymer/paper-input/paper-textarea.js";
+import "@polymer/paper-dialog-scrollable/paper-dialog-scrollable.js";
 import "@polymer/paper-dialog/paper-dialog.js";
 // This is not a duplicate import, one is for types, one is for element.
 // tslint:disable-next-line
@@ -10,7 +11,13 @@ import { PaperDialogElement } from "@polymer/paper-dialog/paper-dialog.js";
 import { HomeAssistant } from "../../../types";
 import { getCardConfig, updateCardConfig } from "../common/data";
 
-export class HuiEditCardModal extends LitElement {
+import "./hui-yaml-editor";
+import "./hui-yaml-card-preview";
+// This is not a duplicate import, one is for types, one is for element.
+// tslint:disable-next-line
+import { HuiYAMLCardPreview } from "./hui-yaml-card-preview";
+
+export class HuiDialogEditCard extends LitElement {
   protected hass?: HomeAssistant;
   private _cardId?: string;
   private _cardConfig?: string;
@@ -31,6 +38,7 @@ export class HuiEditCardModal extends LitElement {
     this.hass = hass;
     this._cardId = cardId;
     this._reloadLovelace = reloadLovelace;
+    this._cardConfig = "";
     this._loadConfig();
     // Wait till dialog is rendered.
     await this.updateComplete;
@@ -41,6 +49,10 @@ export class HuiEditCardModal extends LitElement {
     return this.shadowRoot!.querySelector("paper-dialog")!;
   }
 
+  private get _previewEl(): HuiYAMLCardPreview {
+    return this.shadowRoot!.querySelector("hui-yaml-card-preview")!;
+  }
+
   protected render() {
     return html`
       <style>
@@ -50,9 +62,16 @@ export class HuiEditCardModal extends LitElement {
       </style>
       <paper-dialog with-backdrop>
         <h2>Card Configuration</h2>
-        <paper-textarea
-          value="${this._cardConfig}"
-        ></paper-textarea>
+        <paper-dialog-scrollable>
+          <hui-yaml-editor
+            .yaml="${this._cardConfig}"
+            @yaml-changed="${this._handleYamlChanged}"
+          ></hui-yaml-editor>
+          <hui-yaml-card-preview
+            .hass="${this.hass}"
+            .yaml="${this._cardConfig}"
+          ></hui-yaml-card-preview>
+        </paper-dialog-scrollable>
         <div class="paper-dialog-buttons">
           <paper-button @click="${this._closeDialog}">Cancel</paper-button>
           <paper-button @click="${this._updateConfig}">Save</paper-button>
@@ -61,6 +80,10 @@ export class HuiEditCardModal extends LitElement {
     `;
   }
 
+  private _handleYamlChanged(ev) {
+    this._previewEl.yaml = ev.detail.yaml;
+  }
+
   private _closeDialog() {
     this._dialog.close();
   }
@@ -73,8 +96,8 @@ export class HuiEditCardModal extends LitElement {
   }
 
   private async _updateConfig() {
-    const newCardConfig = this.shadowRoot!.querySelector("paper-textarea")!
-      .value;
+    const newCardConfig = this.shadowRoot!.querySelector("hui-yaml-editor")!
+      .yaml;
 
     if (this._cardConfig === newCardConfig) {
       this._dialog.close();
@@ -92,8 +115,8 @@ export class HuiEditCardModal extends LitElement {
 
 declare global {
   interface HTMLElementTagNameMap {
-    "ha-dialog-edit-card": HuiEditCardModal;
+    "hui-dialog-edit-card": HuiDialogEditCard;
   }
 }
 
-customElements.define("ha-dialog-edit-card", HuiEditCardModal);
+customElements.define("hui-dialog-edit-card", HuiDialogEditCard);

src/panels/lovelace/editor/hui-yaml-card-preview.ts

@@ -0,0 +1,52 @@
+import yaml from "js-yaml";
+
+import "@polymer/paper-input/paper-textarea.js";
+
+import createCardElement from "../common/create-card-element";
+import createErrorCardConfig from "../common/create-error-card-config";
+import { HomeAssistant } from "../../../types";
+import { LovelaceCard } from "../types";
+
+export class HuiYAMLCardPreview extends HTMLElement {
+  private _hass?: HomeAssistant;
+
+  set hass(value: HomeAssistant) {
+    this._hass = value;
+    if (this.lastChild) {
+      (this.lastChild as LovelaceCard).hass = value;
+    }
+  }
+
+  set yaml(value: string) {
+    if (this.lastChild) {
+      this.removeChild(this.lastChild);
+    }
+
+    if (value === "") {
+      return;
+    }
+
+    let conf;
+    try {
+      conf = yaml.safeLoad(value);
+    } catch (err) {
+      conf = createErrorCardConfig(`Invalid YAML: ${err.message}`, undefined);
+    }
+
+    const element = createCardElement(conf);
+
+    if (this._hass) {
+      element.hass = this._hass;
+    }
+
+    this.appendChild(element);
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "hui-yaml-card-preview": HuiYAMLCardPreview;
+  }
+}
+
+customElements.define("hui-yaml-card-preview", HuiYAMLCardPreview);

src/panels/lovelace/editor/hui-yaml-editor.ts

@@ -0,0 +1,41 @@
+import { html, LitElement, PropertyDeclarations } from "@polymer/lit-element";
+import { fireEvent } from "../../../common/dom/fire_event.js";
+
+import "@polymer/paper-input/paper-textarea.js";
+
+export class HuiYAMLEditor extends LitElement {
+  public yaml?: string;
+
+  static get properties(): PropertyDeclarations {
+    return {
+      yaml: {},
+    };
+  }
+
+  protected render() {
+    return html`
+      <style>
+        paper-textarea {
+          --paper-input-container-shared-input-style_-_font-family: monospace;
+        }
+      </style>
+      <paper-textarea
+        value="${this.yaml}"
+        @value-changed="${this._valueChanged}"
+      ></paper-textarea>
+    `;
+  }
+
+  private _valueChanged(ev) {
+    this.yaml = ev.target.value;
+    fireEvent(this, "yaml-changed", { yaml: ev.target.value });
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "hui-yaml-editor": HuiYAMLEditor;
+  }
+}
+
+customElements.define("hui-yaml-editor", HuiYAMLEditor);