Separate initialize, update and destroy functions.

src/js/plugin/update.js

@@ -0,0 +1,107 @@
+/* Copyright (c) 2015 Hyunje Alex Jun and other contributors
+ * Licensed under the MIT License
+ */
+'use strict';
+
+var cls = require('../lib/class')
+  , d = require('../lib/dom')
+  , h = require('../lib/helper')
+  , instances = require('./instances');
+
+function getThumbSize(i, thumbSize) {
+  if (i.settings.minScrollbarLength) {
+    thumbSize = Math.max(thumbSize, i.settings.minScrollbarLength);
+  }
+  if (i.settings.maxScrollbarLength) {
+    thumbSize = Math.min(thumbSize, i.settings.maxScrollbarLength);
+  }
+  return thumbSize;
+}
+
+function updateCss(element, i) {
+  var xRailOffset = {width: i.railXWidth};
+  if (i.isRtl) {
+    xRailOffset.left = element.scrollLeft + i.containerWidth - i.contentWidth;
+  } else {
+    xRailOffset.left = element.scrollLeft;
+  }
+  if (i.isScrollbarXUsingBottom) {
+    xRailOffset.bottom = i.scrollbarXBottom - element.scrollTop;
+  } else {
+    xRailOffset.top = i.scrollbarXTop + element.scrollTop;
+  }
+  d.css(i.scrollbarXRail, xRailOffset);
+
+  var railYOffset = {top: element.scrollTop, height: i.railYHeight};
+
+  if (i.isScrollbarYUsingRight) {
+    if (i.isRtl) {
+      railYOffset.right = i.contentWidth - element.scrollLeft - i.scrollbarYRight - i.scrollbarY.offsetWidth;
+    } else {
+      railYOffset.right = i.scrollbarYRight - element.scrollLeft;
+    }
+  } else {
+    if (i.isRtl) {
+      railYOffset.left = element.scrollLeft + i.containerWidth * 2 - i.contentWidth - i.scrollbarYLeft - i.scrollbarY.offsetWidth;
+    } else {
+      railYOffset.left = i.scrollbarYLeft + element.scrollLeft;
+    }
+  }
+  d.css(i.scrollbarYRail, railYOffset);
+
+  d.css(i.scrollbarX, {left: i.scrollbarXLeft, width: i.scrollbarXWidth - i.railBorderXWidth});
+  d.css(i.scrollbarY, {top: i.scrollbarYTop, height: i.scrollbarYHeight - i.railBorderYWidth});
+}
+
+module.exports = function (element) {
+  var i = instances.get(element);
+
+  // Hide scrollbars not to affect scrollWidth and scrollHeight
+  cls.remove(element, 'ps-active-x');
+  cls.remove(element, 'ps-active-y');
+
+  i.containerWidth = element.clientWidth;
+  i.containerHeight = element.clientHeight;
+  i.contentWidth = element.scrollWidth;
+  i.contentHeight = element.scrollHeight;
+
+  if (!i.settings.suppressScrollX && i.containerWidth + i.settings.scrollXMarginOffset < i.contentWidth) {
+    i.scrollbarXActive = true;
+    i.railXWidth = i.containerWidth - i.railXMarginWidth;
+    i.scrollbarXWidth = getThumbSize(i, h.toInt(i.railXWidth * i.containerWidth / i.contentWidth));
+    i.scrollbarXLeft = h.toInt(element.scrollLeft * (i.railXWidth - i.scrollbarXWidth) / (i.contentWidth - i.containerWidth));
+  } else {
+    i.scrollbarXActive = false;
+    i.scrollbarXWidth = 0;
+    i.scrollbarXLeft = 0;
+    element.scrollLeft = 0;
+  }
+
+  if (!i.settings.suppressScrollY && i.containerHeight + i.settings.scrollYMarginOffset < i.contentHeight) {
+    i.scrollbarYActive = true;
+    i.railYHeight = i.containerHeight - i.railYMarginHeight;
+    i.scrollbarYHeight = getThumbSize(i, h.toInt(i.railYHeight * i.containerHeight / i.contentHeight));
+    i.scrollbarYTop = h.toInt(element.scrollTop * (i.railYHeight - i.scrollbarYHeight) / (i.contentHeight - i.containerHeight));
+  } else {
+    i.scrollbarYActive = false;
+    i.scrollbarYHeight = 0;
+    i.scrollbarYTop = 0;
+    element.scrollTop = 0;
+  }
+
+  if (i.scrollbarXLeft >= i.railXWidth - i.scrollbarXWidth) {
+    i.scrollbarXLeft = i.railXWidth - i.scrollbarXWidth;
+  }
+  if (i.scrollbarYTop >= i.railYHeight - i.scrollbarYHeight) {
+    i.scrollbarYTop = i.railYHeight - i.scrollbarYHeight;
+  }
+
+  updateCss(element, i);
+
+  if (i.scrollbarXActive) {
+    cls.add(element, 'ps-active-x');
+  }
+  if (i.scrollbarYActive) {
+    cls.add(element, 'ps-active-y');
+  }
+};