1 files changed, 149 insertions, 0 deletions
diff --git a/js/src/util/backdrop.js b/js/src/util/backdrop.js
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+++ b/js/src/util/backdrop.js
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+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v5.2.3): util/backdrop.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import EventHandler from '../dom/event-handler'
+import { execute, executeAfterTransition, getElement, reflow } from './index'
+import Config from './config'
+
+/**
+ * Constants
+ */
+
+const NAME = 'backdrop'
+const CLASS_NAME_FADE = 'fade'
+const CLASS_NAME_SHOW = 'show'
+const EVENT_MOUSEDOWN = `mousedown.bs.${NAME}`
+
+const Default = {
+  className: 'modal-backdrop',
+  clickCallback: null,
+  isAnimated: false,
+  isVisible: true, // if false, we use the backdrop helper without adding any element to the dom
+  rootElement: 'body' // give the choice to place backdrop under different elements
+}
+
+const DefaultType = {
+  className: 'string',
+  clickCallback: '(function|null)',
+  isAnimated: 'boolean',
+  isVisible: 'boolean',
+  rootElement: '(element|string)'
+}
+
+/**
+ * Class definition
+ */
+
+class Backdrop extends Config {
+  constructor(config) {
+    super()
+    this._config = this._getConfig(config)
+    this._isAppended = false
+    this._element = null
+  }
+
+  // Getters
+  static get Default() {
+    return Default
+  }
+
+  static get DefaultType() {
+    return DefaultType
+  }
+
+  static get NAME() {
+    return NAME
+  }
+
+  // Public
+  show(callback) {
+    if (!this._config.isVisible) {
+      execute(callback)
+      return
+    }
+
+    this._append()
+
+    const element = this._getElement()
+    if (this._config.isAnimated) {
+      reflow(element)
+    }
+
+    element.classList.add(CLASS_NAME_SHOW)
+
+    this._emulateAnimation(() => {
+      execute(callback)
+    })
+  }
+
+  hide(callback) {
+    if (!this._config.isVisible) {
+      execute(callback)
+      return
+    }
+
+    this._getElement().classList.remove(CLASS_NAME_SHOW)
+
+    this._emulateAnimation(() => {
+      this.dispose()
+      execute(callback)
+    })
+  }
+
+  dispose() {
+    if (!this._isAppended) {
+      return
+    }
+
+    EventHandler.off(this._element, EVENT_MOUSEDOWN)
+
+    this._element.remove()
+    this._isAppended = false
+  }
+
+  // Private
+  _getElement() {
+    if (!this._element) {
+      const backdrop = document.createElement('div')
+      backdrop.className = this._config.className
+      if (this._config.isAnimated) {
+        backdrop.classList.add(CLASS_NAME_FADE)
+      }
+
+      this._element = backdrop
+    }
+
+    return this._element
+  }
+
+  _configAfterMerge(config) {
+    // use getElement() with the default "body" to get a fresh Element on each instantiation
+    config.rootElement = getElement(config.rootElement)
+    return config
+  }
+
+  _append() {
+    if (this._isAppended) {
+      return
+    }
+
+    const element = this._getElement()
+    this._config.rootElement.append(element)
+
+    EventHandler.on(element, EVENT_MOUSEDOWN, () => {
+      execute(this._config.clickCallback)
+    })
+
+    this._isAppended = true
+  }
+
+  _emulateAnimation(callback) {
+    executeAfterTransition(callback, this._getElement(), this._config.isAnimated)
+  }
+}
+
+export default Backdrop