436 lines
14 KiB
JavaScript
436 lines
14 KiB
JavaScript
/* Copyright (c) 2012 HyeonJe Jun (http://github.com/noraesae)
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* Licensed under the MIT License
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*/
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'use strict';
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((function ($) {
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// The default settings for the plugin
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var defaultSettings = {
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wheelSpeed: 10,
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wheelPropagation: false,
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minScrollbarLength: null
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};
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$.fn.perfectScrollbar = function (suppliedSettings, option) {
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return this.each(function () {
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// Use the default settings
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var settings = $.extend(true, {}, defaultSettings),
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$this = $(this);
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if (typeof suppliedSettings === "object") {
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// But over-ride any supplied
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$.extend(true, settings, suppliedSettings);
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} else {
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// If no settings were supplied, then the first param must be the option
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option = suppliedSettings;
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}
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// Catch options
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if (option === 'update') {
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if ($this.data('perfect-scrollbar-update')) {
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$this.data('perfect-scrollbar-update')();
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}
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return $this;
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}
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else if (option === 'destroy') {
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if ($this.data('perfect-scrollbar-destroy')) {
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$this.data('perfect-scrollbar-destroy')();
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}
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return $this;
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}
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if ($this.data('perfect-scrollbar')) {
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// if there's already perfect-scrollbar
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return $this.data('perfect-scrollbar');
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}
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// Or generate new perfectScrollbar
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// Set class to the container
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$this.addClass('ps-container');
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var $scrollbarX = $("<div class='ps-scrollbar-x'></div>").appendTo($this),
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$scrollbarY = $("<div class='ps-scrollbar-y'></div>").appendTo($this),
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containerWidth,
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containerHeight,
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contentWidth,
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contentHeight,
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scrollbarXWidth,
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scrollbarXLeft,
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scrollbarXBottom = parseInt($scrollbarX.css('bottom'), 10),
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scrollbarYHeight,
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scrollbarYTop,
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scrollbarYRight = parseInt($scrollbarY.css('right'), 10);
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var updateContentScrollTop = function () {
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var scrollTop = parseInt(scrollbarYTop * (contentHeight - containerHeight) / (containerHeight - scrollbarYHeight), 10);
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$this.scrollTop(scrollTop);
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$scrollbarX.css({bottom: scrollbarXBottom - scrollTop});
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};
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var updateContentScrollLeft = function () {
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var scrollLeft = parseInt(scrollbarXLeft * (contentWidth - containerWidth) / (containerWidth - scrollbarXWidth), 10);
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$this.scrollLeft(scrollLeft);
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$scrollbarY.css({right: scrollbarYRight - scrollLeft});
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};
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var getSettingsAdjustedThumbSize = function (thumbSize) {
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if (settings.minScrollbarLength) {
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thumbSize = Math.max(thumbSize, settings.minScrollbarLength);
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}
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return thumbSize;
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};
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var updateScrollbarCss = function () {
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$scrollbarX.css({left: scrollbarXLeft + $this.scrollLeft(), bottom: scrollbarXBottom - $this.scrollTop(), width: scrollbarXWidth});
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$scrollbarY.css({top: scrollbarYTop + $this.scrollTop(), right: scrollbarYRight - $this.scrollLeft(), height: scrollbarYHeight});
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};
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var updateBarSizeAndPosition = function () {
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containerWidth = $this.width();
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containerHeight = $this.height();
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contentWidth = $this.prop('scrollWidth');
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contentHeight = $this.prop('scrollHeight');
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if (containerWidth < contentWidth) {
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scrollbarXWidth = getSettingsAdjustedThumbSize(parseInt(containerWidth * containerWidth / contentWidth, 10));
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scrollbarXLeft = parseInt($this.scrollLeft() * (containerWidth - scrollbarXWidth) / (contentWidth - containerWidth), 10);
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}
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else {
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scrollbarXWidth = 0;
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scrollbarXLeft = 0;
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$this.scrollLeft(0);
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}
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if (containerHeight < contentHeight) {
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scrollbarYHeight = getSettingsAdjustedThumbSize(parseInt(containerHeight * containerHeight / contentHeight, 10));
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scrollbarYTop = parseInt($this.scrollTop() * (containerHeight - scrollbarYHeight) / (contentHeight - containerHeight), 10);
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}
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else {
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scrollbarYHeight = 0;
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scrollbarYTop = 0;
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$this.scrollTop(0);
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}
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if (scrollbarYTop >= containerHeight - scrollbarYHeight) {
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scrollbarYTop = containerHeight - scrollbarYHeight;
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}
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if (scrollbarXLeft >= containerWidth - scrollbarXWidth) {
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scrollbarXLeft = containerWidth - scrollbarXWidth;
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}
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updateScrollbarCss();
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};
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var moveBarX = function (currentLeft, deltaX) {
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var newLeft = currentLeft + deltaX,
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maxLeft = containerWidth - scrollbarXWidth;
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if (newLeft < 0) {
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scrollbarXLeft = 0;
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}
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else if (newLeft > maxLeft) {
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scrollbarXLeft = maxLeft;
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}
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else {
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scrollbarXLeft = newLeft;
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}
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$scrollbarX.css({left: scrollbarXLeft + $this.scrollLeft()});
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};
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var moveBarY = function (currentTop, deltaY) {
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var newTop = currentTop + deltaY,
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maxTop = containerHeight - scrollbarYHeight;
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if (newTop < 0) {
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scrollbarYTop = 0;
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}
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else if (newTop > maxTop) {
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scrollbarYTop = maxTop;
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}
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else {
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scrollbarYTop = newTop;
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}
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$scrollbarY.css({top: scrollbarYTop + $this.scrollTop()});
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};
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var bindMouseScrollXHandler = function () {
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var currentLeft,
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currentPageX;
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$scrollbarX.bind('mousedown.perfect-scroll', function (e) {
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currentPageX = e.pageX;
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currentLeft = $scrollbarX.position().left;
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$scrollbarX.addClass('in-scrolling');
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e.stopPropagation();
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e.preventDefault();
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});
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$(document).bind('mousemove.perfect-scroll', function (e) {
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if ($scrollbarX.hasClass('in-scrolling')) {
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updateContentScrollLeft();
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moveBarX(currentLeft, e.pageX - currentPageX);
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e.stopPropagation();
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e.preventDefault();
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}
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});
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$(document).bind('mouseup.perfect-scroll', function (e) {
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if ($scrollbarX.hasClass('in-scrolling')) {
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$scrollbarX.removeClass('in-scrolling');
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}
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});
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currentLeft =
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currentPageX = null;
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};
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var bindMouseScrollYHandler = function () {
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var currentTop,
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currentPageY;
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$scrollbarY.bind('mousedown.perfect-scroll', function (e) {
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currentPageY = e.pageY;
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currentTop = $scrollbarY.position().top;
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$scrollbarY.addClass('in-scrolling');
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e.stopPropagation();
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e.preventDefault();
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});
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$(document).bind('mousemove.perfect-scroll', function (e) {
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if ($scrollbarY.hasClass('in-scrolling')) {
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updateContentScrollTop();
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moveBarY(currentTop, e.pageY - currentPageY);
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e.stopPropagation();
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e.preventDefault();
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}
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});
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$(document).bind('mouseup.perfect-scroll', function (e) {
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if ($scrollbarY.hasClass('in-scrolling')) {
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$scrollbarY.removeClass('in-scrolling');
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}
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});
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currentTop =
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currentPageY = null;
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};
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// bind handlers
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var bindMouseWheelHandler = function () {
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var shouldPreventDefault = function (deltaX, deltaY) {
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var scrollTop = $this.scrollTop();
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if (scrollTop === 0 && deltaY > 0 && deltaX === 0) {
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return !settings.wheelPropagation;
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}
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else if (scrollTop >= contentHeight - containerHeight && deltaY < 0 && deltaX === 0) {
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return !settings.wheelPropagation;
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}
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var scrollLeft = $this.scrollLeft();
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if (scrollLeft === 0 && deltaX < 0 && deltaY === 0) {
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return !settings.wheelPropagation;
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}
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else if (scrollLeft >= contentWidth - containerWidth && deltaX > 0 && deltaY === 0) {
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return !settings.wheelPropagation;
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}
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return true;
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};
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var shouldPrevent = false;
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$this.bind('mousewheel.perfect-scroll', function (e, delta, deltaX, deltaY) {
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$this.scrollTop($this.scrollTop() - (deltaY * settings.wheelSpeed));
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$this.scrollLeft($this.scrollLeft() + (deltaX * settings.wheelSpeed));
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// update bar position
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updateBarSizeAndPosition();
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shouldPrevent = shouldPreventDefault(deltaX, deltaY);
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if (shouldPrevent) {
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e.preventDefault();
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}
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});
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// fix Firefox scroll problem
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$this.bind('MozMousePixelScroll.perfect-scroll', function (e) {
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if (shouldPrevent) {
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e.preventDefault();
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}
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});
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};
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// bind mobile touch handler
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var bindMobileTouchHandler = function () {
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var applyTouchMove = function (differenceX, differenceY) {
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$this.scrollTop($this.scrollTop() - differenceY);
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$this.scrollLeft($this.scrollLeft() - differenceX);
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// update bar position
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updateBarSizeAndPosition();
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};
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var startCoords = {},
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startTime = 0,
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speed = {},
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breakingProcess = null,
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inGlobalTouch = false;
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$(window).bind("touchstart.perfect-scroll", function (e) {
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inGlobalTouch = true;
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});
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$(window).bind("touchend.perfect-scroll", function (e) {
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inGlobalTouch = false;
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});
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$this.bind("touchstart.perfect-scroll", function (e) {
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var touch = e.originalEvent.targetTouches[0];
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startCoords.pageX = touch.pageX;
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startCoords.pageY = touch.pageY;
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startTime = (new Date()).getTime();
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if (breakingProcess !== null) {
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clearInterval(breakingProcess);
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}
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e.stopPropagation();
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});
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$this.bind("touchmove.perfect-scroll", function (e) {
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if (!inGlobalTouch && e.originalEvent.targetTouches.length === 1) {
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var touch = e.originalEvent.targetTouches[0];
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var currentCoords = {};
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currentCoords.pageX = touch.pageX;
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currentCoords.pageY = touch.pageY;
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var differenceX = currentCoords.pageX - startCoords.pageX,
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differenceY = currentCoords.pageY - startCoords.pageY;
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applyTouchMove(differenceX, differenceY);
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startCoords = currentCoords;
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var currentTime = (new Date()).getTime();
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speed.x = differenceX / (currentTime - startTime);
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speed.y = differenceY / (currentTime - startTime);
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startTime = currentTime;
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e.preventDefault();
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}
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});
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$this.bind("touchend.perfect-scroll", function (e) {
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clearInterval(breakingProcess);
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breakingProcess = setInterval(function () {
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if (Math.abs(speed.x) < 0.01 && Math.abs(speed.y) < 0.01) {
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clearInterval(breakingProcess);
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return;
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}
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applyTouchMove(speed.x * 30, speed.y * 30);
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speed.x *= 0.8;
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speed.y *= 0.8;
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}, 10);
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});
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};
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var destroy = function () {
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$this.unbind('.perfect-scroll');
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$(window).unbind('.perfect-scroll');
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$(document).unbind('.perfect-scroll');
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$this.data('perfect-scrollbar', null);
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$this.data('perfect-scrollbar-update', null);
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$this.data('perfect-scrollbar-destroy', null);
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$scrollbarX.remove();
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$scrollbarY.remove();
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// clean all variables
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$scrollbarX =
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$scrollbarY =
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containerWidth =
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containerHeight =
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contentWidth =
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contentHeight =
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scrollbarXWidth =
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scrollbarXLeft =
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scrollbarXBottom =
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scrollbarYHeight =
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scrollbarYTop =
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scrollbarYRight = null;
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};
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var ieSupport = function (version) {
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$this.addClass('ie').addClass('ie' + version);
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var bindHoverHandlers = function () {
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var mouseenter = function () {
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$(this).addClass('hover');
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};
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var mouseleave = function () {
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$(this).removeClass('hover');
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};
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$this.bind('mouseenter.perfect-scroll', mouseenter).bind('mouseleave.perfect-scroll', mouseleave);
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$scrollbarX.bind('mouseenter.perfect-scroll', mouseenter).bind('mouseleave.perfect-scroll', mouseleave);
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$scrollbarY.bind('mouseenter.perfect-scroll', mouseenter).bind('mouseleave.perfect-scroll', mouseleave);
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};
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var fixIe6ScrollbarPosition = function () {
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updateScrollbarCss = function () {
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$scrollbarX.css({left: scrollbarXLeft + $this.scrollLeft(), bottom: scrollbarXBottom, width: scrollbarXWidth});
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$scrollbarY.css({top: scrollbarYTop + $this.scrollTop(), right: scrollbarYRight, height: scrollbarYHeight});
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$scrollbarX.hide().show();
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$scrollbarY.hide().show();
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};
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updateContentScrollTop = function () {
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var scrollTop = parseInt(scrollbarYTop * contentHeight / containerHeight, 10);
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$this.scrollTop(scrollTop);
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$scrollbarX.css({bottom: scrollbarXBottom});
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$scrollbarX.hide().show();
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};
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updateContentScrollLeft = function () {
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var scrollLeft = parseInt(scrollbarXLeft * contentWidth / containerWidth, 10);
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$this.scrollLeft(scrollLeft);
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$scrollbarY.hide().show();
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};
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};
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if (version === 6) {
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bindHoverHandlers();
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fixIe6ScrollbarPosition();
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}
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};
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var supportsTouch = (('ontouchstart' in window) || window.DocumentTouch && document instanceof window.DocumentTouch);
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var initialize = function () {
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var ieMatch = navigator.userAgent.toLowerCase().match(/(msie) ([\w.]+)/);
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if (ieMatch && ieMatch[1] === 'msie') {
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// must be executed at first, because 'ieSupport' may addClass to the container
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ieSupport(parseInt(ieMatch[2], 10));
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}
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updateBarSizeAndPosition();
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bindMouseScrollXHandler();
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bindMouseScrollYHandler();
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if (supportsTouch) {
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bindMobileTouchHandler();
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}
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if ($this.mousewheel) {
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bindMouseWheelHandler();
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}
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$this.data('perfect-scrollbar', $this);
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$this.data('perfect-scrollbar-update', updateBarSizeAndPosition);
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$this.data('perfect-scrollbar-destroy', destroy);
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};
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// initialize
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initialize();
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return $this;
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});
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};
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})(jQuery));
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