feat(item): show tooltip when text ellipsis

packages/elements/src/item/__snapshots__/Item.md

@@ -9,10 +9,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -35,10 +32,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -61,10 +55,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -82,10 +73,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   tiger
   <slot>
   </slot>
@@ -107,10 +95,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   tiger
   <slot>
   </slot>
@@ -132,10 +117,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -153,10 +135,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
   <div part="sub-label">
@@ -177,10 +156,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   tiger
   <slot>
   </slot>
@@ -225,10 +201,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -255,10 +228,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -282,10 +252,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>
@@ -301,10 +268,7 @@
   <slot name="left">
   </slot>
 </div>
-<div
-  id="label"
-  part="center"
->
+<div part="center">
   <slot>
   </slot>
 </div>

packages/elements/src/item/__test__/item.test.js

@@ -1,4 +1,4 @@
-import { elementUpdated, expect, fixture, nextFrame } from '@refinitiv-ui/test-helpers';
+import { elementUpdated, expect, fixture } from '@refinitiv-ui/test-helpers';
 // import element and theme
 import '@refinitiv-ui/elements/item';
 import '@refinitiv-ui/elemental-theme/light/ef-item';
@@ -17,6 +17,10 @@ const createFixture = (type = '') => {
       return fixture('<ef-item label="tiger">Test Not Highlightable</ef-item>');
     case 'is_truncated':
       return fixture('<div style="width: 100px; overflow: hidden;"><ef-item>Super vary long string that need to be truncated by parent</ef-item></div>');
+    case 'is_truncated_label':
+      return fixture('<div style="width: 100px; overflow: hidden;"><ef-item label="Super vary long string that need to be truncated by parent"></ef-item></div>');
+    case 'is_truncated_subLabel':
+      return fixture('<div style="width: 100px; overflow: hidden;"><ef-item sub-label="Super vary long string that need to be truncated by parent"></ef-item></div>');
     case 'with_icon':
       return fixture('<ef-item icon="tick">With settings icon</ef-item>');
     case 'with_empty_icon':
@@ -130,23 +134,27 @@ describe('item/Item', () => {
       expect(el.highlightable).to.equal(false);
     });
 
-    it('Should truncate text', async () => {
+    it('Should truncate item text', async () => {
       const div = await createFixture('is_truncated');
       const el = div.querySelector('ef-item');
+      expect(el.isItemOverflown(), 'Should truncate text').to.equal(true);
+    });
 
-      await elementUpdated(el);
-      await nextFrame();
+    it('Should truncate label', async () => {
+      const div = await createFixture('is_truncated_label');
+      const el = div.querySelector('ef-item');
+      expect(el.isItemOverflown(), 'Should truncate text').to.equal(true);
+    });
 
-      expect(el.isTruncated, 'Should truncate text').to.equal(true);
+    it('Should truncate subLabel', async () => {
+      const div = await createFixture('is_truncated_subLabel');
+      const el = div.querySelector('ef-item');
+      expect(el.isItemOverflown(), 'Should truncate text').to.equal(true);
     });
 
-    it('Should not truncate text', async () => {
+    it('Should not truncate item text', async () => {
       const el = await createFixture();
-
-      await elementUpdated(el);
-      await nextFrame();
-
-      expect(el.isTruncated, 'Should not truncate text').to.equal(false);
+      expect(el.isItemOverflown(), 'Should not truncate text').to.equal(false);
     });
   });
 

packages/elements/src/item/index.ts

@@ -8,11 +8,12 @@ import {
 } from '@refinitiv-ui/core';
 import { customElement } from '@refinitiv-ui/core/decorators/custom-element.js';
 import { property } from '@refinitiv-ui/core/decorators/property.js';
-import { query } from '@refinitiv-ui/core/decorators/query.js';
 import { VERSION } from '../version.js';
 import '../icon/index.js';
 import '../checkbox/index.js';
-
+import { registerOverflowTooltip } from '../tooltip/index.js';
+import { isElementOverflown } from '@refinitiv-ui/utils/element.js';
+import { createRef, ref, Ref } from '@refinitiv-ui/core/directives/ref.js';
 import type { ItemType, ItemText, ItemHeader, ItemDivider, ItemData } from './helpers/types';
 export type { ItemType, ItemText, ItemHeader, ItemDivider, ItemData };
 
@@ -126,10 +127,19 @@ export class Item extends ControlElement {
   public for: string | null = null;
 
   /**
-   * Cache label element
+   * Reference to the label element
+   */
+  private labelRef: Ref<HTMLDivElement> = createRef();
+
+  /**
+   * Reference to the subLabel element
+   */
+  private subLabelRef: Ref<HTMLDivElement> = createRef();
+
+  /**
+   * Reference to the slot element
    */
-  @query('#label')
-  private labelEl?: HTMLElement;
+  private slotRef: Ref<HTMLSlotElement> = createRef();
 
   /**
    * True, if there is no slotted content
@@ -187,6 +197,16 @@ export class Item extends ControlElement {
     }
   }
 
+  /**
+   * Called after the component is first rendered
+   * @param changedProperties Properties which have changed
+   * @returns {void}
+   */
+  protected firstUpdated (changedProperties: PropertyValues): void {
+    super.firstUpdated(changedProperties);
+    registerOverflowTooltip(this, () => this.getItemContent(), () => this.isItemOverflown());
+  }
+
   /**
    * Invoked before update() to compute values needed during the update.
    * @param changedProperties changed properties
@@ -204,6 +224,45 @@ export class Item extends ControlElement {
     }
   }
 
+
+  /**
+   * Get Item content
+   * @returns return item content from slot or label and sub-label
+   */
+  private getItemContent (): string {
+
+    if (this.isSlotEmpty) {
+      let text = '';
+      if (this.label) {
+        text += this.label;
+      }
+      if (this.subLabel) {
+        text += text ? ` (${this.subLabel})` : this.subLabel;
+      }
+      return text;
+    }
+    else {
+      return this.slotContent;
+    }
+  }
+
+  /**
+   * Get element overflown
+   * @param element Target element
+   * @returns return true if element is overflown.
+   */
+  private isItemElementOverflown (element?: HTMLElement): boolean {
+    return element ? isElementOverflown(element) : false;
+  }
+
+  /**
+   * Get item overflown
+   * @returns return true if an item is overflown.
+   */
+  private isItemOverflown (): boolean {
+    return this.isItemElementOverflown(this.labelRef.value) || this.isItemElementOverflown(this.subLabelRef.value);
+  }
+
   /**
    * Get icon template if icon attribute is defined
    */
@@ -215,14 +274,22 @@ export class Item extends ControlElement {
    * Get subLabel template if it is defined and no slot content present
    */
   private get subLabelTemplate (): TemplateResult | undefined {
-    return this.subLabel && this.isSlotEmpty ? html`<div part="sub-label">${this.subLabel}</div>` : undefined;
+    return html`<div part="sub-label" ${ref(this.subLabelRef)}>${this.subLabel}</div>`;
   }
 
   /**
    * Get label template if it is defined and no slot content present
    */
   private get labelTemplate (): TemplateResult | undefined {
-    return this.label && this.isSlotEmpty ? html`${this.label}` : undefined;
+    return html`${this.label}`;
+  }
+
+  /**
+   * Get slot content
+   */
+  private get slotContent (): string {
+    const nodes = this.slotRef.value?.assignedNodes() || [];
+    return nodes.map(node => node.textContent).join(' ').trim();
   }
 
   /**
@@ -251,15 +318,6 @@ export class Item extends ControlElement {
     return !this.disabled && this.type !== 'header' && this.type !== 'divider';
   }
 
-  /**
-   * Getter returning if the label is truncated
-   * @prop {boolean} isTruncated
-   * @returns whether element is truncated or not
-   */
-  public get isTruncated (): boolean {
-    return !!(this.labelEl && (this.labelEl.offsetWidth < this.labelEl.scrollWidth));
-  }
-
   /**
    * A `TemplateResult` that will be used
    * to render the updated internal template.
@@ -272,10 +330,10 @@ export class Item extends ControlElement {
         ${this.multipleTemplate}
         <slot name="left"></slot>
       </div>
-      <div part="center" id="label">
-        ${this.labelTemplate}
-        <slot @slotchange="${this.checkSlotChildren}"></slot>
-        ${this.subLabelTemplate}
+      <div part="center" ${ref(this.labelRef)}>
+        ${this.label && this.isSlotEmpty ? this.labelTemplate : undefined}
+        <slot ${ref(this.slotRef)} @slotchange="${this.checkSlotChildren}"></slot>
+        ${this.subLabel && this.isSlotEmpty ? this.subLabelTemplate : undefined}
       </div>
       <div part="right">
         <slot name="right"></slot>