- initial implementation of antiscroll, squashed

app/assets/index.html

@@ -32,7 +32,6 @@
   <link rel="shortcut icon" href="/images/favicon.ico">
   <link rel="stylesheet" href="/stylesheets/app.css">
   <script src="/lib/ace/ace.js"></script>  
-  
   <!--[if IE 9]>     <script src="/javascripts/vendor_with_box2d.js"></script> <![endif]-->
   <!--[if !IE]><!--> <script src="/javascripts/vendor.js"></script>            <!--<![endif]-->
   <script src="/javascripts/app.js"></script> <!-- it's all Backbone! -->
@@ -112,7 +111,11 @@
 
   <header class="header-container" id="header-container"></header>
   
-  <div id="page-container"></div>
+  <div class="antiscroll-wrap">
+    <div class="antiscroll-inner">
+      <div id="page-container"></div>
+    </div>
+  </div>
 
   <div id="modal-wrapper"></div>
 
@@ -155,5 +158,12 @@
     (function(a){if(window.filepicker){return}var b=a.createElement("script");b.type="text/javascript";b.async=!0;b.src=("https:"===a.location.protocol?"https:":"http:")+"//api.filepicker.io/v1/filepicker.js";var c=a.getElementsByTagName("script")[0];c.parentNode.insertBefore(b,c);var d={};d._queue=[];var e="pick,pickMultiple,pickAndStore,read,write,writeUrl,export,convert,store,storeUrl,remove,stat,setKey,constructWidget,makeDropPane".split(",");var f=function(a,b){return function(){b.push([a,arguments])}};for(var g=0;g<e.length;g++){d[e[g]]=f(e[g],d._queue)}window.filepicker=d})(document);
   </script>
   <!-- end filepicker.io code -->
+  <!-- begin antiscroll code -->
+  <script type="text/javascript">  
+    $(function () {
+       $('.antiscroll-wrap').antiscroll();
+     });
+  </script>
+  <!-- end antiscroll code -->
 </body>
 </html>

vendor/scripts/antiscroll.js

@@ -0,0 +1,471 @@
+(function ($) {
+
+  /**
+   * Augment jQuery prototype.
+   */
+
+  $.fn.antiscroll = function (options) {
+    return this.each(function () {
+      if ($(this).data('antiscroll')) {
+        $(this).data('antiscroll').destroy();
+      }
+
+      $(this).data('antiscroll', new $.Antiscroll(this, options));
+    });
+  };
+
+  /**
+   * Expose constructor.
+   */
+
+  $.Antiscroll = Antiscroll;
+
+  /**
+   * Antiscroll pane constructor.
+   *
+   * @param {Element|jQuery} main pane
+   * @parma {Object} options
+   * @api public
+   */
+
+  function Antiscroll (el, opts) {
+    this.el = $(el);
+    this.options = opts || {};
+
+    this.x = (false !== this.options.x) || this.options.forceHorizontal;
+    this.y = (false !== this.options.y) || this.options.forceVertical;
+    this.autoHide = false !== this.options.autoHide;
+    this.padding = undefined == this.options.padding ? 2 : this.options.padding;
+
+    this.inner = this.el.find('.antiscroll-inner');
+    this.inner.css({
+        'width':  '+=' + (this.y ? scrollbarSize() : 0)
+      , 'height': '+=' + (this.x ? scrollbarSize() : 0)
+    });
+
+    this.refresh();
+  };
+
+  /**
+   * refresh scrollbars
+   *
+   * @api public
+   */
+
+  Antiscroll.prototype.refresh = function() {
+    var needHScroll = this.inner.get(0).scrollWidth > this.el.width() + (this.y ? scrollbarSize() : 0), 
+	    needVScroll = this.inner.get(0).scrollHeight > this.el.height() + (this.x ? scrollbarSize() : 0);
+
+    if (this.x) {
+      if (!this.horizontal && needHScroll) {
+        this.horizontal = new Scrollbar.Horizontal(this);
+      } else if (this.horizontal && !needHScroll)  {
+        this.horizontal.destroy();
+        this.horizontal = null;
+      } else if (this.horizontal) {
+        this.horizontal.update();
+      }
+    }
+
+    if (this.y) {
+      if (!this.vertical && needVScroll) {
+        this.vertical = new Scrollbar.Vertical(this);
+      } else if (this.vertical && !needVScroll)  {
+        this.vertical.destroy();
+        this.vertical = null;
+      } else if (this.vertical) {
+        this.vertical.update();
+      }
+    }
+  };
+
+  /**
+   * Cleans up.
+   *
+   * @return {Antiscroll} for chaining
+   * @api public
+   */
+
+  Antiscroll.prototype.destroy = function () {
+    if (this.horizontal) {
+      this.horizontal.destroy();
+      this.horizontal = null
+    }
+    if (this.vertical) {
+      this.vertical.destroy();
+      this.vertical = null
+    }
+    return this;
+  };
+
+  /**
+   * Rebuild Antiscroll.
+   *
+   * @return {Antiscroll} for chaining
+   * @api public
+   */
+
+  Antiscroll.prototype.rebuild = function () {
+    this.destroy();
+    this.inner.attr('style', '');
+    Antiscroll.call(this, this.el, this.options);
+    return this;
+  };
+
+  /**
+   * Scrollbar constructor.
+   *
+   * @param {Element|jQuery} element
+   * @api public
+   */
+
+  function Scrollbar (pane) {
+    this.pane = pane;
+    this.pane.el.append(this.el);
+    this.innerEl = this.pane.inner.get(0);
+
+    this.dragging = false;
+    this.enter = false;
+    this.shown = false;
+
+    // hovering
+    this.pane.el.mouseenter($.proxy(this, 'mouseenter'));
+    this.pane.el.mouseleave($.proxy(this, 'mouseleave'));
+
+    // dragging
+    this.el.mousedown($.proxy(this, 'mousedown'));
+
+    // scrolling
+    this.innerPaneScrollListener = $.proxy(this, 'scroll');
+    this.pane.inner.scroll(this.innerPaneScrollListener);
+
+    // wheel -optional-
+    this.innerPaneMouseWheelListener = $.proxy(this, 'mousewheel');
+    this.pane.inner.bind('mousewheel', this.innerPaneMouseWheelListener);
+
+    // show
+    var initialDisplay = this.pane.options.initialDisplay;
+
+    if (initialDisplay !== false) {
+      this.show();
+      if (this.pane.autoHide) {
+          this.hiding = setTimeout($.proxy(this, 'hide'), parseInt(initialDisplay, 10) || 3000);
+      }
+    }
+  };
+
+  /**
+   * Cleans up.
+   *
+   * @return {Scrollbar} for chaining
+   * @api public
+   */
+
+  Scrollbar.prototype.destroy = function () {
+    this.el.remove();
+    this.pane.inner.unbind('scroll', this.innerPaneScrollListener);
+    this.pane.inner.unbind('mousewheel', this.innerPaneMouseWheelListener);
+    return this;
+  };
+
+  /**
+   * Called upon mouseenter.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.mouseenter = function () {
+    this.enter = true;
+    this.show();
+  };
+
+  /**
+   * Called upon mouseleave.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.mouseleave = function () {
+    this.enter = false;
+
+    if (!this.dragging) {
+        if (this.pane.autoHide) {
+            this.hide();
+        }
+    }
+  };
+
+  /**
+   * Called upon wrap scroll.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.scroll = function () {
+    if (!this.shown) {
+      this.show();
+      if (!this.enter && !this.dragging) {
+        if (this.pane.autoHide) {
+            this.hiding = setTimeout($.proxy(this, 'hide'), 1500);
+        }
+      }
+    }
+
+    this.update();
+  };
+
+  /**
+   * Called upon scrollbar mousedown.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.mousedown = function (ev) {
+    ev.preventDefault();
+
+    this.dragging = true;
+
+    this.startPageY = ev.pageY - parseInt(this.el.css('top'), 10);
+    this.startPageX = ev.pageX - parseInt(this.el.css('left'), 10);
+
+    // prevent crazy selections on IE
+    this.el[0].ownerDocument.onselectstart = function () { return false; };
+
+    var pane = this.pane,
+	    move = $.proxy(this, 'mousemove'),
+		self = this
+
+    $(this.el[0].ownerDocument)
+      .mousemove(move)
+      .mouseup(function () {
+        self.dragging = false;
+        this.onselectstart = null;
+
+        $(this).unbind('mousemove', move);
+
+        if (!self.enter) {
+          self.hide();
+        }
+      });
+  };
+
+  /**
+   * Show scrollbar.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.show = function (duration) {
+    if (!this.shown && this.update()) {
+      this.el.addClass('antiscroll-scrollbar-shown');
+      if (this.hiding) {
+        clearTimeout(this.hiding);
+        this.hiding = null;
+      }
+      this.shown = true;
+    }
+  };
+
+  /**
+   * Hide scrollbar.
+   *
+   * @api private
+   */
+
+  Scrollbar.prototype.hide = function () {
+    if (this.pane.autoHide !== false && this.shown) {
+      // check for dragging
+      this.el.removeClass('antiscroll-scrollbar-shown');
+      this.shown = false;
+    }
+  };
+
+  /**
+   * Horizontal scrollbar constructor
+   *
+   * @api private
+   */
+
+  Scrollbar.Horizontal = function (pane) {
+    this.el = $('<div class="antiscroll-scrollbar antiscroll-scrollbar-horizontal"/>', pane.el);
+    Scrollbar.call(this, pane);
+  };
+
+  /**
+   * Inherits from Scrollbar.
+   */
+
+  inherits(Scrollbar.Horizontal, Scrollbar);
+
+  /**
+   * Updates size/position of scrollbar.
+   *
+   * @api private
+   */
+
+  Scrollbar.Horizontal.prototype.update = function () {
+    var paneWidth = this.pane.el.width(), 
+	    trackWidth = paneWidth - this.pane.padding * 2,
+		innerEl = this.pane.inner.get(0)
+
+    this.el
+      .css('width', trackWidth * paneWidth / innerEl.scrollWidth)
+      .css('left', trackWidth * innerEl.scrollLeft / innerEl.scrollWidth);
+
+    return paneWidth < innerEl.scrollWidth;
+  };
+
+  /**
+   * Called upon drag.
+   *
+   * @api private
+   */
+
+  Scrollbar.Horizontal.prototype.mousemove = function (ev) {
+    var trackWidth = this.pane.el.width() - this.pane.padding * 2, 
+	    pos = ev.pageX - this.startPageX,
+		barWidth = this.el.width(),
+		innerEl = this.pane.inner.get(0)
+
+    // minimum top is 0, maximum is the track height
+    var y = Math.min(Math.max(pos, 0), trackWidth - barWidth);
+
+    innerEl.scrollLeft = (innerEl.scrollWidth - this.pane.el.width())
+      * y / (trackWidth - barWidth);
+  };
+
+  /**
+   * Called upon container mousewheel.
+   *
+   * @api private
+   */
+
+  Scrollbar.Horizontal.prototype.mousewheel = function (ev, delta, x, y) {
+    if ((x < 0 && 0 == this.pane.inner.get(0).scrollLeft) ||
+        (x > 0 && (this.innerEl.scrollLeft + Math.ceil(this.pane.el.width())
+          == this.innerEl.scrollWidth))) {
+      ev.preventDefault();
+      return false;
+    }
+  };
+
+  /**
+   * Vertical scrollbar constructor
+   *
+   * @api private
+   */
+
+  Scrollbar.Vertical = function (pane) {
+    this.el = $('<div class="antiscroll-scrollbar antiscroll-scrollbar-vertical"/>', pane.el);
+    Scrollbar.call(this, pane);
+  };
+
+  /**
+   * Inherits from Scrollbar.
+   */
+
+  inherits(Scrollbar.Vertical, Scrollbar);
+
+  /**
+   * Updates size/position of scrollbar.
+   *
+   * @api private
+   */
+
+  Scrollbar.Vertical.prototype.update = function () {
+    var paneHeight = this.pane.el.height(), 
+	    trackHeight = paneHeight - this.pane.padding * 2,
+		innerEl = this.innerEl;
+      
+    var scrollbarHeight = trackHeight * paneHeight / innerEl.scrollHeight;
+    scrollbarHeight = scrollbarHeight < 20 ? 20 : scrollbarHeight;
+    
+    var topPos = trackHeight * innerEl.scrollTop / innerEl.scrollHeight;
+    
+    if((topPos + scrollbarHeight) > trackHeight) {
+        var diff = (topPos + scrollbarHeight) - trackHeight;
+        topPos = topPos - diff - 3;
+    }
+
+    this.el
+      .css('height', scrollbarHeight)
+      .css('top', topPos);
+	  
+	  return paneHeight < innerEl.scrollHeight;
+  };
+
+  /**
+   * Called upon drag.
+   *
+   * @api private
+   */
+
+  Scrollbar.Vertical.prototype.mousemove = function (ev) {
+    var paneHeight = this.pane.el.height(),
+	    trackHeight = paneHeight - this.pane.padding * 2,
+		pos = ev.pageY - this.startPageY,
+		barHeight = this.el.height(),
+		innerEl = this.innerEl
+
+    // minimum top is 0, maximum is the track height
+    var y = Math.min(Math.max(pos, 0), trackHeight - barHeight);
+
+    innerEl.scrollTop = (innerEl.scrollHeight - paneHeight)
+      * y / (trackHeight - barHeight);
+  };
+
+  /**
+   * Called upon container mousewheel.
+   *
+   * @api private
+   */
+
+  Scrollbar.Vertical.prototype.mousewheel = function (ev, delta, x, y) {
+    if ((y > 0 && 0 == this.innerEl.scrollTop) ||
+        (y < 0 && (this.innerEl.scrollTop + Math.ceil(this.pane.el.height())
+          == this.innerEl.scrollHeight))) {
+      ev.preventDefault();
+      return false;
+    }
+  };
+
+  /**
+   * Cross-browser inheritance.
+   *
+   * @param {Function} constructor
+   * @param {Function} constructor we inherit from
+   * @api private
+   */
+
+  function inherits (ctorA, ctorB) {
+    function f() {};
+    f.prototype = ctorB.prototype;
+    ctorA.prototype = new f;
+  };
+
+  /**
+   * Scrollbar size detection.
+   */
+
+  var size;
+
+  function scrollbarSize () {
+    if (size === undefined) {
+      var div = $(
+          '<div class="antiscroll-inner" style="width:50px;height:50px;overflow-y:scroll;'
+        + 'position:absolute;top:-200px;left:-200px;"><div style="height:100px;width:100%"/>'
+        + '</div>'
+      );
+
+      $('body').append(div);
+      var w1 = $(div).innerWidth();
+      var w2 = $('div', div).innerWidth();
+      $(div).remove();
+
+      size = w1 - w2;
+    }
+
+    return size;
+  };
+
+})(jQuery);

vendor/styles/antiscroll.css

@@ -0,0 +1,63 @@
+.antiscroll-wrap {
+  display: inline-block;
+  position: relative;
+  overflow: hidden;
+}
+
+.antiscroll-scrollbar {
+  background: gray;
+  background: rgba(0, 0, 0, 0.5);
+  -webkit-border-radius: 7px;
+  -moz-border-radius: 7px;
+  border-radius: 7px;
+  -webkit-box-shadow: 0 0 1px #fff;
+  -moz-box-shadow: 0 0 1px #fff;
+  box-shadow: 0 0 1px #fff;
+  position: absolute;
+  opacity: 0;
+  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
+  -webkit-transition: linear 300ms opacity;
+  -moz-transition: linear 300ms opacity;
+  -o-transition: linear 300ms opacity;
+}
+
+.antiscroll-scrollbar-shown {
+  opacity: 1;
+  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
+}
+
+.antiscroll-scrollbar-horizontal {
+  height: 7px;
+  margin-left: 2px;
+  bottom: 2px;
+  left: 0;
+}
+
+.antiscroll-scrollbar-vertical {
+  width: 7px;
+  margin-top: 2px;
+  right: 2px;
+  top: 0;
+}
+
+.antiscroll-inner {
+  overflow: scroll;
+}
+
+/** A bug in Chrome 25 on Lion requires each selector to have their own
+    blocks. E.g. the following:
+
+    .antiscroll-inner::-webkit-scrollbar, .antiscroll-inner::scrollbar {...}
+
+    causes the width and height rules to be ignored by the browser resulting
+    in both native and antiscroll scrollbars appearing at the same time.
+ */
+.antiscroll-inner::-webkit-scrollbar {
+  width: 0;
+  height: 0;
+}
+
+.antiscroll-inner::scrollbar {
+  width: 0;
+  height: 0;
+}