Autoupdate.

It listens new elements addition and element resize in order to trigger the update method to redraw the scroll.
8 years ago · d74bdcccec
parent 5f34edc8c7
commit d74bdcccec
6 changed files with 119 additions and 1 deletions
--- a/examples/options-autoupdate.html
+++ b/examples/options-autoupdate.html
@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="content-type" content="text/html; charset=utf-8">
+    <title>perfect-scrollbar example</title>
+    <link href="../dist/css/perfect-scrollbar.css" rel="stylesheet">
+    <script src="../dist/js/perfect-scrollbar.js"></script>
+    <style>
+      .contentHolder { position:relative; margin:0px auto; padding:0px; width: 80%; height: 400px; overflow: auto; }
+      .always-visible.contentHolder .content { background-image: url('./azusa.jpg'); width: 680px; height: 320px; }
+      .spacer { text-align:center }
+
+      .always-visible.ps-container > .ps-scrollbar-x-rail,
+      .always-visible.ps-container > .ps-scrollbar-y-rail {
+        opacity: 0.6;
+      }
+    </style>
+  </head>
+  <body>
+    <div id="Default" class="contentHolder always-visible">
+      <div id="Content" class="content">
+      </div>
+    </div>
+    <p style='text-align: center'>
+      <button onclick='addContent()'>Add new content!</button>
+      <button onclick='removeContent()'>Remove content!</button>
+    </p>
+    <script>
+      var i = 1;
+      var $ = document.querySelector.bind(document);
+      window.onload = function () {
+        Ps.initialize($('#Default'), {
+          autoupdate: true
+        });
+      };
+
+      var addContent = function () {
+        var newDiv = document.createElement('div');
+        newDiv.id = 'node' + i++;
+        var newContent = document.createTextNode('Hi there!');
+        newDiv.appendChild(newContent);
+
+        $('#Default').insertBefore(newDiv, $('#Content'));
+      };
+
+      var removeContent = function () {
+        if (i <= 1) return;
+
+        var node = $('#node' + --i);
+        node.parentNode.removeChild(node);
+      };
+    </script>
+  </body>
+</html>
+
--- a/src/js/plugin/autoupdate.js
+++ b/src/js/plugin/autoupdate.js
@ -0,0 +1,23 @@
+'use strict';
+
+var update = require('./update');
+var MutationObserver = window.MutationObserver;
+var instances = require('./instances');
+
+module.exports = function (element) {
+  if (MutationObserver === null || MutationObserver === undefined) {
+    // MutationObserver is not supported
+    return;
+  }
+
+  var i = instances.get(element);
+  var onMutationObserver = function () {
+    update(element);
+  };
+
+  i.observer = new MutationObserver(onMutationObserver);
+  onMutationObserver();
+
+  var config = { childList: true, subtree: true };
+  i.observer.observe(element, config);
+};
--- a/src/js/plugin/default-setting.js
+++ b/src/js/plugin/default-setting.js
@ -12,5 +12,6 @@ module.exports = {
  useBothWheelAxes: false,
  wheelPropagation: false,
  wheelSpeed: 1,
-  theme: 'default'
+  theme: 'default',
+  autoupdate: true
 };
--- a/src/js/plugin/destroy.js
+++ b/src/js/plugin/destroy.js
@ -11,6 +11,14 @@ module.exports = function (element) {
    return;
  }

+  if (i.observer) {
+    i.observer.disconnect();
+  }
+
+  if (i.resizer) {
+    i.resizer.remove();
+  }
+
  i.event.unbindAll();
  dom.remove(i.scrollbarX);
  dom.remove(i.scrollbarY);
--- a/src/js/plugin/initialize.js
+++ b/src/js/plugin/initialize.js
@ -4,6 +4,8 @@ var _ = require('../lib/helper');
 var cls = require('../lib/class');
 var instances = require('./instances');
 var updateGeometry = require('./update-geometry');
+var autoupdate = require('./autoupdate');
+var resizer = require('./resizer');

 // Handlers
 var handlers = {
@ -34,4 +36,9 @@ module.exports = function (element, userSettings) {
  nativeScrollHandler(element);

  updateGeometry(element);
+
+  if (i.settings.autoupdate) {
+    autoupdate(element);
+    resizer(element);
+  }
 };
--- a/src/js/plugin/resizer.js
+++ b/src/js/plugin/resizer.js
@ -0,0 +1,24 @@
+'use strict';
+
+var update = require('./update');
+var instances = require('./instances');
+
+module.exports = function (element) {
+  var CSS = 'position:absolute;left:0;top:-100%;width:100%;height:100%;margin:1px 0 0;border:none;opacity:0;visibility:hidden;pointer-events:none;';
+
+  var i = instances.get(element);
+
+  var onMutationObserver = function () {
+    update(element);
+  };
+
+  var resizer = function (element, handler) {
+    var frame = document.createElement('iframe');
+    frame.style.cssText = CSS;
+    element.appendChild(frame);
+    i.event.bind(frame.contentWindow, 'resize', handler);
+    return frame;
+  };
+
+  i.resizer = resizer(element, onMutationObserver);
+};