fix(img): draggable attribute is now inherited to inner img element (#24781)

Resolves #21325

Co-authored-by: Celilsemi Sam Erkiner <celilsemi@erkiner.com>
Co-authored-by: Liam DeBeasi <liamdebeasi@users.noreply.github.com>

core/src/components/back-button/back-button.tsx

@@ -5,7 +5,7 @@ import { config } from '../../global/config';
 import { getIonMode } from '../../global/ionic-global';
 import { AnimationBuilder, Color } from '../../interface';
 import { ButtonInterface } from '../../utils/element-interface';
-import { inheritAttributes } from '../../utils/helpers';
+import { Attributes, inheritAttributes } from '../../utils/helpers';
 import { createColorClasses, hostContext, openURL } from '../../utils/theme';
 
 /**
@@ -24,7 +24,7 @@ import { createColorClasses, hostContext, openURL } from '../../utils/theme';
   shadow: true
 })
 export class BackButton implements ComponentInterface, ButtonInterface {
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLElement;
 

core/src/components/breadcrumb/breadcrumb.tsx

@@ -3,7 +3,7 @@ import { chevronForwardOutline, ellipsisHorizontal } from 'ionicons/icons';
 
 import { getIonMode } from '../../global/ionic-global';
 import { AnimationBuilder, BreadcrumbCollapsedClickEventDetail, Color, RouterDirection } from '../../interface';
-import { inheritAttributes } from '../../utils/helpers';
+import { Attributes, inheritAttributes } from '../../utils/helpers';
 import { createColorClasses, hostContext, openURL } from '../../utils/theme';
 
 /**
@@ -22,7 +22,7 @@ import { createColorClasses, hostContext, openURL } from '../../utils/theme';
   shadow: true
 })
 export class Breadcrumb implements ComponentInterface {
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
   private collapsedRef?: HTMLElement;
 
   /** @internal */

core/src/components/button/button.tsx

@@ -3,7 +3,7 @@ import { Component, ComponentInterface, Element, Event, EventEmitter, Host, Prop
 import { getIonMode } from '../../global/ionic-global';
 import { AnimationBuilder, Color, RouterDirection } from '../../interface';
 import { AnchorInterface, ButtonInterface } from '../../utils/element-interface';
-import { hasShadowDom, inheritAttributes } from '../../utils/helpers';
+import { Attributes, hasShadowDom, inheritAttributes } from '../../utils/helpers';
 import { createColorClasses, hostContext, openURL } from '../../utils/theme';
 
 /**
@@ -28,7 +28,7 @@ export class Button implements ComponentInterface, AnchorInterface, ButtonInterf
   private inItem = false;
   private inListHeader = false;
   private inToolbar = false;
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLElement;
 

core/src/components/header/header.tsx

@@ -1,7 +1,7 @@
 import { Component, ComponentInterface, Element, Host, Prop, h, writeTask } from '@stencil/core';
 
 import { getIonMode } from '../../global/ionic-global';
-import { componentOnReady, inheritAttributes } from '../../utils/helpers';
+import { Attributes, componentOnReady, inheritAttributes } from '../../utils/helpers';
 import { hostContext } from '../../utils/theme';
 
 import { cloneElement, createHeaderIndex, handleContentScroll, handleHeaderFade, handleToolbarIntersection, setHeaderActive, setToolbarBackgroundOpacity } from './header.utils';
@@ -21,7 +21,7 @@ export class Header implements ComponentInterface {
   private contentScrollCallback?: any;
   private intersectionObserver?: any;
   private collapsibleMainHeader?: HTMLElement;
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLElement;
 

core/src/components/img/img.tsx

@@ -1,6 +1,7 @@
 import { Component, ComponentInterface, Element, Event, EventEmitter, Host, Prop, State, Watch, h } from '@stencil/core';
 
 import { getIonMode } from '../../global/ionic-global';
+import { Attributes, inheritAttributes } from '../../utils/helpers';
 
 /**
  * @part image - The inner `img` element.
@@ -13,6 +14,7 @@ import { getIonMode } from '../../global/ionic-global';
 export class Img implements ComponentInterface {
 
   private io?: IntersectionObserver;
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLElement;
 
@@ -45,6 +47,10 @@ export class Img implements ComponentInterface {
   /** Emitted when the img fails to load */
   @Event() ionError!: EventEmitter<void>;
 
+  componentWillLoad() {
+    this.inheritedAttributes = inheritAttributes(this.el, ['draggable']);
+  }
+
   componentDidLoad() {
     this.addIO();
   }
@@ -100,17 +106,38 @@ export class Img implements ComponentInterface {
   }
 
   render() {
+    const { loadSrc, alt, onLoad, loadError, inheritedAttributes } = this;
+    const { draggable } = inheritedAttributes;
     return (
       <Host class={getIonMode(this)}>
         <img
           decoding="async"
-          src={this.loadSrc}
+          src={loadSrc}
-          alt={this.alt}
+          alt={alt}
-          onLoad={this.onLoad}
+          onLoad={onLoad}
-          onError={this.loadError}
+          onError={loadError}
           part="image"
+          draggable={isDraggable(draggable)}
         />
       </Host>
     );
   }
 }
+
+/**
+ * Enumerated strings must be set as booleans
+ * as Stencil will not render 'false' in the DOM.
+ * The need to explicitly render draggable="true"
+ * as only certain elements are draggable by default.
+ * https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/draggable.
+ */
+const isDraggable = (draggable?: string): boolean | undefined => {
+  switch (draggable) {
+    case 'true':
+      return true;
+    case 'false':
+      return false;
+    default:
+      return undefined;
+  }
+}

core/src/components/img/test/draggable/e2e.ts

@@ -0,0 +1,17 @@
+import { newE2EPage } from '@stencil/core/testing';
+
+test('img: draggable', async () => {
+  const page = await newE2EPage({
+    url: '/src/components/img/test/draggable?ionic:_testing=true'
+  });
+
+  const imgDraggableTrue = await page.find('#img-draggable-true >>> img');
+  expect(imgDraggableTrue.getAttribute('draggable')).toEqual('true');
+
+  const imgDraggableFalse = await page.find('#img-draggable-false >>> img');
+  expect(imgDraggableFalse.getAttribute('draggable')).toEqual('false');
+
+  const imgDraggableUnset = await page.find('#img-draggable-unset >>> img');
+  expect(imgDraggableUnset.getAttribute('draggable')).toEqual(null);
+
+});

core/src/components/img/test/draggable/index.html

@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html lang="en" dir="ltr">
+
+<head>
+  <meta charset="UTF-8">
+  <title>Img - Draggable</title>
+  <meta name="viewport"
+    content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
+  <link href="../../../../../css/ionic.bundle.css" rel="stylesheet">
+  <link href="../../../../../scripts/testing/styles.css" rel="stylesheet">
+  <script src="../../../../../scripts/testing/scripts.js"></script>
+  <script nomodule src="../../../../../dist/ionic/ionic.js"></script>
+  <script type="module" src="../../../../../dist/ionic/ionic.esm.js"></script>
+
+  <style>
+    ion-img::part(image) {
+      border: 1px solid rgba(0, 0, 0, 0.5);
+      border-radius: 4px;
+      height: 100px;
+      width: 100px;
+    }
+  </style>
+</head>
+
+<body>
+  <ion-app>
+
+    <ion-header>
+      <ion-toolbar>
+        <ion-title>Img - Draggable</ion-title>
+      </ion-toolbar>
+    </ion-header>
+
+    <ion-content class="ion-padding">
+      <ion-list>
+        <ion-item>
+          <ion-label>Draggable</ion-label>
+          <ion-img id="img-draggable-true" draggable="true"
+            src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAB4AAAARQAQMAAAA2ut43AAAABlBMVEXMzMz////TjRV2AAAEPUlEQVR42u3RMREAMBDDsPAn/eXhavOq87Ztu7u7+6eBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBf2hvgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgatgn4GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGr7S0wMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDBwFewzMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwcLW9BQYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBq6CfQYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgautrfAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAVbDPwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwNX2FhgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGLgK9hkYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBi42t4CAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDV8E+AwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDA1fbW2BgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYOAq2GdgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGDgansLDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMXAX7DAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDFxtb4GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGrYJ+BgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBq+0tMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwcBXsMzAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMHC1vQUGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgaugn0GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGjvYD5WuYrpZqdmcAAAAASUVORK5CYII=">
+          </ion-img>
+        </ion-item>
+        <ion-item>
+          <ion-label>Not draggable (draggable="false")</ion-label>
+          <ion-img id="img-draggable-false" draggable="false"
+            src="data:image/png;base64,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">
+          </ion-img>
+        </ion-item>
+        <ion-item>
+          <ion-label>Draggable (draggable not set)</ion-label>
+          <ion-img id="img-draggable-unset"
+            src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAB4AAAARQAQMAAAA2ut43AAAABlBMVEXMzMz////TjRV2AAAEPUlEQVR42u3RMREAMBDDsPAn/eXhavOq87Ztu7u7+6eBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBf2hvgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgatgn4GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGr7S0wMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDBwFewzMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwcLW9BQYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBq6CfQYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgautrfAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAVbDPwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwNX2FhgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGLgK9hkYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBi42t4CAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDV8E+AwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDA1fbW2BgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYOAq2GdgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGDgansLDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMXAX7DAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDFxtb4GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGrYJ+BgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBq+0tMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwcBXsMzAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMHC1vQUGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgaugn0GBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGjvYD5WuYrpZqdmcAAAAASUVORK5CYII">
+          </ion-img>
+        </ion-item>
+      </ion-list>
+    </ion-content>
+
+  </ion-app>
+</body>
+
+</html>

core/src/components/input/input.tsx

@@ -2,7 +2,7 @@ import { Build, Component, ComponentInterface, Element, Event, EventEmitter, Hos
 
 import { getIonMode } from '../../global/ionic-global';
 import { AutocompleteTypes, Color, InputChangeEventDetail, StyleEventDetail, TextFieldTypes } from '../../interface';
-import { debounceEvent, findItemLabel, inheritAttributes } from '../../utils/helpers';
+import { Attributes, debounceEvent, findItemLabel, inheritAttributes } from '../../utils/helpers';
 import { createColorClasses } from '../../utils/theme';
 
 /**
@@ -21,7 +21,7 @@ export class Input implements ComponentInterface {
   private nativeInput?: HTMLInputElement;
   private inputId = `ion-input-${inputIds++}`;
   private didBlurAfterEdit = false;
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
   private isComposing = false;
 
   /**

core/src/components/menu-button/menu-button.tsx

@@ -5,7 +5,7 @@ import { config } from '../../global/config';
 import { getIonMode } from '../../global/ionic-global';
 import { Color } from '../../interface';
 import { ButtonInterface } from '../../utils/element-interface';
-import { inheritAttributes } from '../../utils/helpers';
+import { Attributes, inheritAttributes } from '../../utils/helpers';
 import { menuController } from '../../utils/menu-controller';
 import { createColorClasses, hostContext } from '../../utils/theme';
 import { updateVisibility } from '../menu-toggle/menu-toggle-util';
@@ -25,7 +25,7 @@ import { updateVisibility } from '../menu-toggle/menu-toggle-util';
   shadow: true
 })
 export class MenuButton implements ComponentInterface, ButtonInterface {
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLIonSegmentElement;
 

core/src/components/menu/menu.tsx

@@ -5,7 +5,7 @@ import { getIonMode } from '../../global/ionic-global';
 import { Animation, Gesture, GestureDetail, MenuChangeEventDetail, MenuI, Side } from '../../interface';
 import { getTimeGivenProgression } from '../../utils/animation/cubic-bezier';
 import { GESTURE_CONTROLLER } from '../../utils/gesture';
-import { assert, clamp, inheritAttributes, isEndSide as isEnd } from '../../utils/helpers';
+import { Attributes, assert, clamp, inheritAttributes, isEndSide as isEnd } from '../../utils/helpers';
 import { menuController } from '../../utils/menu-controller';
 import { getOverlay } from '../../utils/overlays';
 
@@ -43,7 +43,7 @@ export class Menu implements ComponentInterface, MenuI {
   contentEl?: HTMLElement;
   lastFocus?: HTMLElement;
 
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   private handleFocus = (ev: FocusEvent) => {
     /**

core/src/components/range/range.tsx

@@ -2,7 +2,7 @@ import { Component, ComponentInterface, Element, Event, EventEmitter, Host, Prop
 
 import { getIonMode } from '../../global/ionic-global';
 import { Color, Gesture, GestureDetail, KnobName, RangeChangeEventDetail, RangeValue, StyleEventDetail } from '../../interface';
-import { clamp, debounceEvent, getAriaLabel, inheritAttributes, renderHiddenInput } from '../../utils/helpers';
+import { Attributes, clamp, debounceEvent, getAriaLabel, inheritAttributes, renderHiddenInput } from '../../utils/helpers';
 import { isRTL } from '../../utils/rtl';
 import { createColorClasses, hostContext } from '../../utils/theme';
 
@@ -38,7 +38,7 @@ export class Range implements ComponentInterface {
   private hasFocus = false;
   private rangeSlider?: HTMLElement;
   private gesture?: Gesture;
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   @Element() el!: HTMLIonRangeElement;
 

core/src/components/textarea/textarea.tsx

@@ -2,7 +2,7 @@ import { Build, Component, ComponentInterface, Element, Event, EventEmitter, Hos
 
 import { getIonMode } from '../../global/ionic-global';
 import { Color, StyleEventDetail, TextareaChangeEventDetail } from '../../interface';
-import { debounceEvent, findItemLabel, inheritAttributes, raf } from '../../utils/helpers';
+import { Attributes, debounceEvent, findItemLabel, inheritAttributes, raf } from '../../utils/helpers';
 import { createColorClasses } from '../../utils/theme';
 
 /**
@@ -22,7 +22,7 @@ export class Textarea implements ComponentInterface {
   private inputId = `ion-textarea-${textareaIds++}`;
   private didBlurAfterEdit = false;
   private textareaWrapper?: HTMLElement;
-  private inheritedAttributes: { [k: string]: any } = {};
+  private inheritedAttributes: Attributes = {};
 
   /**
    * This is required for a WebKit bug which requires us to

core/src/utils/helpers.ts

@@ -75,6 +75,8 @@ export const componentOnReady = (el: any, callback: any) => {
   }
 }
 
+export type Attributes = { [key: string]: any };
+
 /**
  * Elements inside of web components sometimes need to inherit global attributes
  * set on the host. For example, the inner input in `ion-input` should inherit
@@ -86,7 +88,7 @@ export const componentOnReady = (el: any, callback: any) => {
  * does not trigger a re-render.
  */
 export const inheritAttributes = (el: HTMLElement, attributes: string[] = []) => {
-  const attributeObject: { [k: string]: any } = {};
+  const attributeObject: Attributes = {};
 
   attributes.forEach(attr => {
     if (el.hasAttribute(attr)) {