/**
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<b>Scrollbars for sidebar</b>. This approach can <span class="text-danger">only</span> be used on <u>fixed</u> sidebar.
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It doesn't use <u>"overflow:hidden"</u> CSS property and therefore can be used with <u>.hover</u> submenus and minimized sidebar.
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Except when in mobile view and menu toggle button is not in the navbar.
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*/
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(function($ , undefined) {
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//if( !$.fn.ace_scroll ) return;
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var old_safari = ace.vars['safari'] && navigator.userAgent.match(/version\/[1-5]/i)
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//NOTE
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//Safari on windows has not been updated for a long time.
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//And it has a problem when sidebar is fixed & scrollable and there is a CSS3 animation inside page content.
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//Very probably windows users of safari have migrated to another browser by now!
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var is_element_pos =
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'getComputedStyle' in window ?
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//el.offsetHeight is used to force redraw and recalculate 'el.style.position' esp. for webkit!
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function(el, pos) { el.offsetHeight; return window.getComputedStyle(el).position == pos }
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:
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function(el, pos) { el.offsetHeight; return $(el).css('position') == pos }
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function Sidebar_Scroll(sidebar , settings) {
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var self = this;
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var $window = $(window);
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var $sidebar = $(sidebar),
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$nav = $sidebar.find('.nav-list'),
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$toggle = $sidebar.find('.sidebar-toggle').eq(0),
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$shortcuts = $sidebar.find('.sidebar-shortcuts').eq(0);
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var nav = $nav.get(0);
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if(!nav) return;
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var attrib_values = ace.helper.getAttrSettings(sidebar, $.fn.ace_sidebar_scroll.defaults);
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this.settings = $.extend({}, $.fn.ace_sidebar_scroll.defaults, settings, attrib_values);
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var scroll_to_active = self.settings.scroll_to_active;
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var ace_sidebar = $sidebar.ace_sidebar('ref');
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$sidebar.attr('data-sidebar-scroll', 'true');
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var scroll_div = null,
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scroll_content = null,
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scroll_content_div = null,
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bar = null,
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track = null,
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ace_scroll = null;
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this.is_scrolling = false;
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var _initiated = false;
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this.sidebar_fixed = is_element_pos(sidebar, 'fixed');
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var $avail_height, $content_height;
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var available_height = function() {
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//available window space
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var offset = $nav.parent().offset();//because `$nav.offset()` considers the "scrolled top" amount as well
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if(self.sidebar_fixed) offset.top -= ace.helper.scrollTop();
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return $window.innerHeight() - offset.top - ( self.settings.include_toggle ? 0 : $toggle.outerHeight() ) + 1;
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}
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var content_height = function() {
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return nav.clientHeight;//we don't use nav.scrollHeight here, because hover submenus are considered in calculating scrollHeight despite position=absolute!
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}
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var initiate = function(on_page_load) {
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if( _initiated ) return;
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if( !self.sidebar_fixed ) return;//eligible??
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//return if we want scrollbars only on "fixed" sidebar and sidebar is not "fixed" yet!
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//initiate once
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$nav.wrap('<div class="nav-wrap-up pos-rel" />');
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$nav.after('<div><div></div></div>');
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$nav.wrap('<div class="nav-wrap" />');
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if(!self.settings.include_toggle) $toggle.css({'z-index': 1});
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if(!self.settings.include_shortcuts) $shortcuts.css({'z-index': 99});
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scroll_div = $nav.parent().next()
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.ace_scroll({
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size: available_height(),
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//reset: true,
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mouseWheelLock: true,
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hoverReset: false,
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dragEvent: true,
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styleClass: self.settings.scroll_style,
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touchDrag: false//disable touch drag event on scrollbars, we'll add a custom one later
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})
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.closest('.ace-scroll').addClass('nav-scroll');
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ace_scroll = scroll_div.data('ace_scroll');
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scroll_content = scroll_div.find('.scroll-content').eq(0);
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scroll_content_div = scroll_content.find(' > div').eq(0);
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track = $(ace_scroll.get_track());
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bar = track.find('.scroll-bar').eq(0);
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if(self.settings.include_shortcuts && $shortcuts.length != 0) {
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$nav.parent().prepend($shortcuts).wrapInner('<div />');
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$nav = $nav.parent();
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}
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if(self.settings.include_toggle && $toggle.length != 0) {
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$nav.append($toggle);
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$nav.closest('.nav-wrap').addClass('nav-wrap-t');//it just helps to remove toggle button's top border and restore li:last-child's bottom border
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}
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$nav.css({position: 'relative'});
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if( self.settings.scroll_outside == true ) scroll_div.addClass('scrollout');
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nav = $nav.get(0);
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nav.style.top = 0;
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scroll_content.on('scroll.nav', function() {
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nav.style.top = (-1 * this.scrollTop) + 'px';
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});
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//mousewheel library available?
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$nav.on(!!$.event.special.mousewheel ? 'mousewheel.ace_scroll' : 'mousewheel.ace_scroll DOMMouseScroll.ace_scroll', function(event){
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if( !self.is_scrolling || !ace_scroll.is_active() ) {
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return !self.settings.lock_anyway;
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}
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//transfer $nav's mousewheel event to scrollbars
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return scroll_div.trigger(event);
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});
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$nav.on('mouseenter.ace_scroll', function() {
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track.addClass('scroll-hover');
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}).on('mouseleave.ace_scroll', function() {
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track.removeClass('scroll-hover');
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});
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/**
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$(document.body).on('touchmove.nav', function(event) {
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if( self.is_scrolling && $.contains(sidebar, event.target) ) {
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event.preventDefault();
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return false;
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}
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})
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*/
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//you can also use swipe event in a similar way //swipe.nav
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var content = scroll_content.get(0);
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$nav.on('ace_drag.nav', function(event) {
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if( !self.is_scrolling || !ace_scroll.is_active() ) {
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event.retval.cancel = true;
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return;
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}
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//if submenu hover is being scrolled let's cancel sidebar scroll!
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if( $(event.target).closest('.can-scroll').length != 0 ) {
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event.retval.cancel = true;
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return;
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}
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if(event.direction == 'up' || event.direction == 'down') {
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ace_scroll.move_bar(true);
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var distance = event.dy;
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distance = parseInt(Math.min($avail_height, distance))
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if(Math.abs(distance) > 2) distance = distance * 2;
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if(distance != 0) {
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content.scrollTop = content.scrollTop + distance;
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nav.style.top = (-1 * content.scrollTop) + 'px';
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}
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}
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});
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//for drag only
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if(self.settings.smooth_scroll) {
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$nav
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.on('touchstart.nav MSPointerDown.nav pointerdown.nav', function(event) {
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$nav.css('transition-property', 'none');
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bar.css('transition-property', 'none');
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})
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.on('touchend.nav touchcancel.nav MSPointerUp.nav MSPointerCancel.nav pointerup.nav pointercancel.nav', function(event) {
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$nav.css('transition-property', 'top');
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bar.css('transition-property', 'top');
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});
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}
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if(old_safari && !self.settings.include_toggle) {
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var toggle = $toggle.get(0);
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if(toggle) scroll_content.on('scroll.safari', function() {
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ace.helper.redraw(toggle);
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});
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}
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_initiated = true;
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//if the active item is not visible, scroll down so that it becomes visible
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//only the first time, on page load
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if(on_page_load == true) {
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self.reset();//try resetting at first
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if( scroll_to_active ) {
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self.scroll_to_active();
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}
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scroll_to_active = false;
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}
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if( typeof self.settings.smooth_scroll === 'number' && self.settings.smooth_scroll > 0) {
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$nav.css({'transition-property': 'top', 'transition-duration': (self.settings.smooth_scroll / 1000).toFixed(2)+'s'})
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bar.css({'transition-property': 'top', 'transition-duration': (self.settings.smooth_scroll / 1500).toFixed(2)+'s'})
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scroll_div
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.on('drag.start', function(e) {
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e.stopPropagation();
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$nav.css('transition-property', 'none')
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})
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.on('drag.end', function(e) {
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e.stopPropagation();
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$nav.css('transition-property', 'top')
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});
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}
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if(ace.vars['android']) {
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//force hide address bar, because its changes don't trigger window resize and become kinda ugly
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var val = ace.helper.scrollTop();
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if(val < 2) {
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window.scrollTo( val, 0 );
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setTimeout( function() {
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self.reset();
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}, 20 );
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}
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var last_height = ace.helper.winHeight() , new_height;
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$(window).on('scroll.ace_scroll', function() {
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if(self.is_scrolling && ace_scroll.is_active()) {
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new_height = ace.helper.winHeight();
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if(new_height != last_height) {
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last_height = new_height;
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self.reset();
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}
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}
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});
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}
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}
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this.scroll_to_active = function() {
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if( !ace_scroll || !ace_scroll.is_active() ) return;
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try {
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//sometimes there's no active item or not 'offsetTop' property
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var $active;
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var vars = ace_sidebar['vars']()
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var nav_list = $sidebar.find('.nav-list')
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if(vars['minimized'] && !vars['collapsible']) {
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$active = nav_list.find('> .active')
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}
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else {
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$active = $nav.find('> .active.hover')
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if($active.length == 0) $active = $nav.find('.active:not(.open)')
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}
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var top = $active.outerHeight();
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nav_list = nav_list.get(0);
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var active = $active.get(0);
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while(active != nav_list) {
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top += active.offsetTop;
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active = active.parentNode;
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}
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var scroll_amount = top - scroll_div.height();
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if(scroll_amount > 0) {
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nav.style.top = -scroll_amount + 'px';
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scroll_content.scrollTop(scroll_amount);
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}
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}catch(e){}
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}
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this.reset = function(recalc) {
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if(recalc === true) {
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this.sidebar_fixed = is_element_pos(sidebar, 'fixed');
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}
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if( !this.sidebar_fixed ) {
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this.disable();
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return;//eligible??
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}
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//return if we want scrollbars only on "fixed" sidebar and sidebar is not "fixed" yet!
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if( !_initiated ) initiate();
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//initiate scrollbars if not yet
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var vars = ace_sidebar['vars']();
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//enable if:
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//menu is not collapsible mode (responsive navbar-collapse mode which has default browser scrollbar)
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//menu is not horizontal or horizontal but mobile view (which is not navbar-collapse)
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//and available height is less than nav's height
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var enable_scroll = !vars['collapsible'] && !vars['horizontal']
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&& ($avail_height = available_height()) < ($content_height = nav.clientHeight);
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//we don't use nav.scrollHeight here, because hover submenus are considered in calculating scrollHeight despite position=absolute!
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this.is_scrolling = true;
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if( enable_scroll ) {
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scroll_content_div.css({height: $content_height, width: 8});
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scroll_div.prev().css({'max-height' : $avail_height})
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ace_scroll.update({size: $avail_height})
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ace_scroll.enable();
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ace_scroll.reset();
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}
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if( !enable_scroll || !ace_scroll.is_active() ) {
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if(this.is_scrolling) this.disable();
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}
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else {
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$sidebar.addClass('sidebar-scroll');
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}
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//return this.is_scrolling;
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}
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this.disable = function() {
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this.is_scrolling = false;
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if(scroll_div) {
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scroll_div.css({'height' : '', 'max-height' : ''});
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scroll_content_div.css({height: '', width: ''});//otherwise it will have height and takes up some space even when invisible
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scroll_div.prev().css({'max-height' : ''})
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ace_scroll.disable();
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}
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if(parseInt(nav.style.top) < 0 && self.settings.smooth_scroll && $.support.transition.end) {
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$nav.one($.support.transition.end, function() {
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$sidebar.removeClass('sidebar-scroll');
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$nav.off('.trans');
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});
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} else {
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$sidebar.removeClass('sidebar-scroll');
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}
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nav.style.top = 0;
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}
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this.prehide = function(height_change) {
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if(!this.is_scrolling || ace_sidebar.get('minimized')) return;//when minimized submenu's toggle should have no effect
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if(content_height() + height_change < available_height()) {
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this.disable();
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}
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else if(height_change < 0) {
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//if content height is decreasing
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//let's move nav down while a submenu is being hidden
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var scroll_top = scroll_content.scrollTop() + height_change
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if(scroll_top < 0) return;
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nav.style.top = (-1 * scroll_top) + 'px';
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}
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}
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this._reset = function(recalc) {
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if(recalc === true) {
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this.sidebar_fixed = is_element_pos(sidebar, 'fixed');
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}
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if(ace.vars['webkit'])
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setTimeout(function() { self.reset() } , 0);
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else this.reset();
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}
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this.set_hover = function() {
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if(track) track.addClass('scroll-hover');
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}
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this.get = function(name) {
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if(this.hasOwnProperty(name)) return this[name];
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}
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this.set = function(name, value) {
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if(this.hasOwnProperty(name)) this[name] = value;
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}
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this.ref = function() {
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//return a reference to self
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return this;
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}
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this.updateStyle = function(styleClass) {
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if(ace_scroll == null) return;
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ace_scroll.update({styleClass: styleClass});
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}
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//change scrollbar size after a submenu is hidden/shown
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//but don't change if sidebar is minimized
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$sidebar.on('hidden.ace.submenu.sidebar_scroll shown.ace.submenu.sidebar_scroll', '.submenu', function(e) {
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e.stopPropagation();
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if( !ace_sidebar.get('minimized') ) {
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//webkit has a little bit of a glitch!!!
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self._reset();
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if( e.type == 'shown' ) self.set_hover();
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}
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});
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initiate(true);//true = on_page_load
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}
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//reset on document and window changes
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$(document).on('settings.ace.sidebar_scroll', function(ev, event_name, event_val){
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$('.sidebar[data-sidebar-scroll=true]').each(function() {
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var $this = $(this);
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var sidebar_scroll = $this.ace_sidebar_scroll('ref');
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if( event_name == 'sidebar_collapsed' && is_element_pos(this, 'fixed') ) {
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if( $this.attr('data-sidebar-hover') == 'true' ) $this.ace_sidebar_hover('reset');
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sidebar_scroll._reset();
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}
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else if( event_name === 'sidebar_fixed' || event_name === 'navbar_fixed' ) {
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var is_scrolling = sidebar_scroll.get('is_scrolling');
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var sidebar_fixed = is_element_pos(this, 'fixed')
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sidebar_scroll.set('sidebar_fixed', sidebar_fixed);
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if(sidebar_fixed && !is_scrolling) {
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sidebar_scroll._reset();
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}
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else if( !sidebar_fixed ) {
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sidebar_scroll.disable();
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}
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}
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});
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});
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$(window).on('resize.ace.sidebar_scroll', function(){
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$('.sidebar[data-sidebar-scroll=true]').each(function() {
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var $this = $(this);
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if( $this.attr('data-sidebar-hover') == 'true' ) $this.ace_sidebar_hover('reset');
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/////////////
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var sidebar_scroll = $(this).ace_sidebar_scroll('ref');
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var sidebar_fixed = is_element_pos(this, 'fixed')
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sidebar_scroll.set('sidebar_fixed', sidebar_fixed);
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sidebar_scroll._reset();
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});
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})
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/////////////////////////////////////////////
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if(!$.fn.ace_sidebar_scroll) {
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$.fn.ace_sidebar_scroll = function (option, value) {
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var method_call;
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var $set = this.each(function () {
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var $this = $(this);
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var data = $this.data('ace_sidebar_scroll');
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var options = typeof option === 'object' && option;
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if (!data) $this.data('ace_sidebar_scroll', (data = new Sidebar_Scroll(this, options)));
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if (typeof option === 'string' && typeof data[option] === 'function') {
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method_call = data[option](value);
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}
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});
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return (method_call === undefined) ? $set : method_call;
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}
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$.fn.ace_sidebar_scroll.defaults = {
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'scroll_to_active': true,
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'include_shortcuts': true,
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'include_toggle': false,
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'smooth_scroll': 150,
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'scroll_outside': false,
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'scroll_style': '',
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'lock_anyway': false
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}
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}
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})(window.jQuery);
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