Add -webkit-overflow-scrolling via JavaScript on navigation

src/assets/javascripts/components/Material/Nav/Scrolling.js

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2016 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Class
+ * ------------------------------------------------------------------------- */
+
+export default class Scrolling {
+
+  /**
+   * Set overflow scrolling on the current active pane (for iOS)
+   *
+   * @constructor
+   * @param {(string|HTMLElement)} el - Selector or HTML element
+   */
+  constructor(el) {
+    this.el_ = (typeof el === "string")
+      ? document.querySelector(el)
+      : el
+  }
+
+  /**
+   * Setup panes
+   */
+  setup() {
+
+    /* Initially set overflow scrolling on main pane */
+    this.el_.children[1].style.webkitOverflowScrolling = "touch"
+
+    /* Find all toggles and check which one is active */
+    const toggles = this.el_.querySelectorAll("[data-md-toggle]")
+    for (const toggle of toggles) {
+      if (!toggle.checked)
+        return
+
+      /* Find corresponding navigational pane */
+      let pane = toggle.nextElementSibling
+      while (pane.tagName !== "NAV")
+        pane = pane.nextElementSibling
+
+      /* Find current and parent list elements */
+      const parent = toggle.parentNode.parentNode
+      const target = pane.children[pane.children.length - 1]
+
+      /* Always reset all lists when transitioning */
+      parent.style.webkitOverflowScrolling = ""
+      target.style.webkitOverflowScrolling = "touch"
+    }
+  }
+
+  /**
+   * Update active panes
+   *
+   * @param {Event} ev - Change event
+   */
+  update(ev) {
+
+    /* Find corresponding navigational pane */
+    let pane = ev.target.nextElementSibling
+    while (pane.tagName !== "NAV")
+      pane = pane.nextElementSibling
+
+    /* Find current and parent list elements */
+    const parent = ev.target.parentNode.parentNode
+    const target = pane.children[pane.children.length - 1]
+
+    /* Always reset all lists when transitioning */
+    parent.style.webkitOverflowScrolling = ""
+    target.style.webkitOverflowScrolling = ""
+
+    /* Set overflow scrolling on parent */
+    if (!ev.target.checked) {
+      const end = () => {
+        parent.style.webkitOverflowScrolling = "touch"
+        pane.removeEventListener("transitionend", end)
+      }
+      pane.addEventListener("transitionend", end, false)
+    }
+
+    /* Set overflow scrolling on target */
+    if (ev.target.checked) {
+      const end = () => {
+        target.style.webkitOverflowScrolling = "touch"
+        pane.removeEventListener("transitionend", end, false)
+      }
+      pane.addEventListener("transitionend", end, false)
+    }
+  }
+
+  /**
+   * Reset panes
+   */
+  reset() {
+
+    /* Reset overflow scrolling on main pane */
+    this.el_.children[1].style.webkitOverflowScrolling = ""
+
+    /* Find all toggles and check which one is active */
+    const toggles = this.el_.querySelectorAll("[data-md-toggle]")
+    for (const toggle of toggles) {
+      if (!toggle.checked)
+        return
+
+      /* Find corresponding navigational pane */
+      let pane = toggle.nextElementSibling
+      while (pane.tagName !== "NAV")
+        pane = pane.nextElementSibling
+
+      /* Find current and parent list elements */
+      const parent = toggle.parentNode.parentNode
+      const target = pane.children[pane.children.length - 1]
+
+      /* Always reset all lists when transitioning */
+      parent.style.webkitOverflowScrolling = ""
+      target.style.webkitOverflowScrolling = ""
+    }
+  }
+}