Initial submenu support.

package.json

@@ -17,6 +17,7 @@
   "dependencies": {
     "@cycjimmy/jsmpeg-player": "^5.0.1",
     "@material/image-list": "^12.0.0",
+    "@material/rtl": "^13.0.0",
     "custom-card-helpers": "^1.8.0",
     "dayjs": "^1.10.7",
     "dlv": "github:developit/dlv",

src/components/elements.ts

@@ -9,6 +9,7 @@ import {
   MenuIcon,
   MenuStateIcon,
   PictureElements,
+  MenuSubmenu,
 } from '../types.js';
 import {
   dispatchErrorMessageEvent,
@@ -339,3 +340,6 @@ export class FrigateCardElementsMenuIcon extends FrigateCardElementsBaseMenuIcon
 
 @customElement('frigate-card-menu-state-icon')
 export class FrigateCardElementsMenuStateIcon extends FrigateCardElementsBaseMenuIcon<MenuStateIcon> {}
+
+@customElement('frigate-card-menu-submenu')
+export class FrigateCardElementsMenuSubmenu extends FrigateCardElementsBaseMenuIcon<MenuSubmenu> {}

src/components/menu.ts

@@ -14,7 +14,10 @@ import { StyleInfo, styleMap } from 'lit/directives/style-map.js';
 
 import { actionHandler } from '../action-handler-directive.js';
 
+import './submenu.js';
+
 import type {
+  Actions,
   ExtendedHomeAssistant,
   MenuButton,
   MenuConfig,
@@ -61,18 +64,26 @@ export class FrigateCardMenu extends LitElement {
    * @param ev The action event.
    * @param button The button configuration.
    */
-  protected _actionHandler(ev: CustomEvent, button: MenuButton): void {
+  protected _actionHandler(ev: CustomEvent<{action: string, config?: Actions}>, config?: Actions): void {
     if (!ev) {
       return;
     }
 
+    // If the event itself contains a configuration then use that. This is
+    // useful in cases where the registration of the event handler does not have
+    // access to the actual desired configuration (e.g. action events generated
+    // by a submenu).
+    if (ev.detail.config) {
+      config = ev.detail.config;
+    }
+
     // These interactions should only be handled by the card, as nothing
     // upstream has the user-provided configuration.
     ev.stopPropagation();
 
     const interaction: string = ev.detail.action;
-    const action = getActionConfigGivenAction(interaction, button);
+    const action = getActionConfigGivenAction(interaction, config);
-    if (!action || !interaction) {
+    if (!config || !action || !interaction) {
       return;
     }
 
@@ -92,7 +103,7 @@ export class FrigateCardMenu extends LitElement {
 
     // Collapse menu after the user clicks on something.
     this.expand = false;
-    handleAction(this, this.hass as HomeAssistant, button, interaction);
+    handleAction(this, this.hass as HomeAssistant, config, interaction);
   }
 
   /**
@@ -169,6 +180,15 @@ export class FrigateCardMenu extends LitElement {
       button: true,
     };
 
+    if (button.type == 'custom:frigate-card-menu-submenu') {
+      return html`
+        <frigate-card-submenu
+          .submenu=${button}
+          @action=${this._actionHandler.bind(this)}
+        >
+        </frigate-card-submenu>`;
+    }
+
     // TODO: Upon a safe distance from the release of HA 2021.11 these
     // attributes can be removed from the <ha-icon-button>.
     // - icon (replaced with the embedded <ha-icon>)

src/components/submenu.ts

@@ -0,0 +1,60 @@
+import { CSSResultGroup, html, LitElement, TemplateResult, unsafeCSS } from 'lit';
+import { customElement, property } from 'lit/decorators';
+
+import { actionHandler } from '../action-handler-directive.js';
+import { MenuSubmenu } from '../types.js';
+
+import submenuStyle from '../scss/submenu.scss';
+import { hasAction } from 'custom-card-helpers';
+
+@customElement('frigate-card-submenu')
+export class FrigateCardSubmenu extends LitElement {
+  @property({ attribute: false })
+  public submenu?: MenuSubmenu;
+
+  protected render(): TemplateResult {
+    if (!this.submenu) {
+      return html``;
+    }
+    return html`
+      <ha-button-menu corner="BOTTOM_LEFT">
+        <ha-icon-button
+          class="button"
+          slot="trigger"
+          .label=${this.submenu.title || ''}
+          .actionHandler=${actionHandler({
+            hasHold: hasAction(this.submenu.hold_action),
+            hasDoubleClick: hasAction(this.submenu.double_tap_action),
+          })}
+        >
+          <ha-icon icon="${this.submenu.icon}"></ha-icon>
+        </ha-icon-button>
+        ${this.submenu.items.map(
+          (item) => html`
+            <mwc-list-item
+              graphic="icon"
+              aria-label="${item.title || ''}"
+              @action=${(ev) => {
+                // Attach the action config so ascendants have access to it.
+                ev.detail.config = item;
+              }}
+              .actionHandler=${actionHandler({
+                hasHold: hasAction(item.hold_action),
+                hasDoubleClick: hasAction(item.double_tap_action),
+              })}
+            >
+              ${item.title || ''}
+              ${item.icon
+                ? html` <ha-icon slot="graphic" icon="${item.icon}"> </ha-icon>`
+                : ``}
+            </mwc-list-item>
+          `,
+        )}
+      </ha-button-menu>
+    `;
+  }
+
+  static get styles(): CSSResultGroup {
+    return unsafeCSS(submenuStyle);
+  }
+}

src/scss/card.scss

@@ -61,7 +61,9 @@ ha-card {
   display: flex;
   flex-direction: column;
   margin: auto;
-  overflow: hidden;
+
+  // Some elements (such as menus) may need to extend beyond the card boundary.
+  overflow: visible;
   width: 100%;
   height: 100%;
   position: relative;

src/scss/menu.scss

@@ -8,35 +8,71 @@
 
 .frigate-card-menu {
   z-index: 1;
-  height: calc(var(--frigate-card-menu-button-size) + 6px);
-  overflow: hidden;
   /* Menu div itself does not handle click events. Without this, in overlay
      mode, the menu div prevents clicking on gallery items 'behind' the overlay.
      */
   pointer-events: none;
+
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
 }
 .frigate-card-menu.overlay-hidden {
   position: absolute;
+  overflow: hidden;
   width: calc(var(--frigate-card-menu-button-size) + 6px);
+  height: calc(var(--frigate-card-menu-button-size) + 6px);
 }
-.frigate-card-menu.overlay-hidden.left, .frigate-card-menu.overlay-hidden.top {
+.frigate-card-menu.overlay-hidden.left {
+  left: 0px;
+  top: 0px;
+
+  // Awful hack: Flexbox column wrapping doesn't work properly in most major
+  // browsers -- the element boundary does not expand to cover the full wrapped
+  // content as it should. This results in the wrapped 'content' appearing
+  // outside the element background (the linear gradient in this case). The
+  // workaround is to use flex row direction for both rows & columns, and use
+  // vertical-lr/vertical-rl as the writing mode for columns -- resetting
+  // writing-mode for descendant elements.
+  //
+  // For more information see the Chromium bug as an example:
+  // - https://bugs.chromium.org/p/chromium/issues/detail?id=507397
+  writing-mode: vertical-lr;
+}
+.frigate-card-menu.overlay-hidden.top {
   left: 0px;
   top: 0px;
 }
 .frigate-card-menu.overlay-hidden.right {
   right: 0px;
   top: 0px;
+
+  // See "Awful hack" above.
+  writing-mode: vertical-rl;
 }
+.frigate-card-menu.overlay-hidden.left > *,.frigate-card-menu.overlay-hidden.right > * {
+  // See "Awful hack" above.
+  writing-mode: horizontal-tb;
+} 
+
 .frigate-card-menu.overlay-hidden.bottom {
   left: 0px;
   bottom: 0px;
+
+  // If the menu has more content that allows, "wrap upwards" to keep the
+  // Frigate button in the same place.
+  flex-wrap: wrap-reverse;
 }
 .frigate-card-menu.overlay-hidden.expanded-horizontal {
   width: 100%;
+  height: auto;
+  overflow: visible;
   background: linear-gradient(90deg, rgba(0,0,0,0.3), rgba(0,0,0,0));
 }
 .frigate-card-menu.overlay-hidden.expanded-vertical {
   height: 100%;
+  width: auto;
+  overflow: visible;
   background: linear-gradient(180deg, rgba(0,0,0,0.3), rgba(0,0,0,0));
 }
 /* Full above/below menu */

src/scss/submenu.scss

@@ -0,0 +1,6 @@
+@use './button.scss';
+
+:host {
+  z-index: 20;
+  pointer-events: auto;
+}

src/types.ts

@@ -198,7 +198,7 @@ const serviceCallButtonSchema = elementsBaseSchema.merge(
   }),
 );
 
-// https://www.home-assistant.io/lovelace/picture-elements/#icon
+// https://www.home-assistant.io/lovelace/picture-elements/#icon-element
 const iconSchema = elementsBaseSchema.merge(
   z.object({
     type: z.literal('icon'),
@@ -269,6 +269,15 @@ export const menuStateIconSchema = stateIconSchema.merge(
 );
 export type MenuStateIcon = z.infer<typeof menuStateIconSchema>;
 
+export const menuSubmenuSchema = iconSchema.merge(
+  z.object({
+    type: z.literal('custom:frigate-card-menu-submenu'),
+    // Menu items don't strictly require their own icon.
+    items: iconSchema.omit({ type: true }).partial({ icon: true }).array(),
+  }),
+);
+export type MenuSubmenu = z.infer<typeof menuSubmenuSchema>;
+
 const frigateCardConditionSchema = z.object({
   view: z.string().array().optional(),
   fullscreen: z.boolean().optional(),
@@ -285,6 +294,7 @@ export type FrigateConditional = z.infer<typeof frigateConditionalSchema>;
 const pictureElementSchema = z.union([
   menuStateIconSchema,
   menuIconSchema,
+  menuSubmenuSchema,
   frigateConditionalSchema,
   stateBadgeIconSchema,
   stateIconSchema,
@@ -586,7 +596,11 @@ export const frigateCardConfigDefaults = {
   event_viewer: viewerConfigDefault,
 };
 
-const menuButtonSchema = z.union([menuIconSchema, menuStateIconSchema]);
+const menuButtonSchema = z.union([
+  menuIconSchema,
+  menuStateIconSchema,
+  menuSubmenuSchema,
+]);
 export type MenuButton = z.infer<typeof menuButtonSchema>;
 export interface ExtendedHomeAssistant {
   hassUrl(path?): string;