Primo commit

Prima versione

jquery.nicescroll.js

@@ -0,0 +1,259 @@
+(function( $ ){
+
+  var AScrollClass = function(myopt) {
+
+    var self = this;
+    
+    var opt = {
+      doc:$("body"),
+      win:$(window),
+      zindex:9999,
+      cursoropacitymin:0,
+      scrollspeed:60
+    };
+    
+    if (myopt) {
+      for(var a in opt) {
+        if (myopt[a]!==undefined) opt[a] = myopt[a];
+      }
+    }
+    
+    this.zindex = opt.zindex;
+    this.cursoropacitymin = opt.cursoropacitymin;
+    
+    this.doc = opt.doc;
+    this.win = opt.win;
+    this.docscroll = (self.doc[0].nodeName=='BODY'||self.doc[0].nodeName=='HTML')?$(window):this.doc;
+    
+    this.screen = false;
+    this.page = false;
+    
+    this.scroll = {x:0,y:0};
+    this.scrollratio = {x:0,y:0};
+    this.cursorheight = 20;
+    this.scrollvaluemax = 0;
+    
+    do {
+      this.id = "ascrail"+Math.round(Math.random() * 99999);
+    } while (document.getElementById(this.id));
+    
+    this.rail = false;
+    this.cursor = false;
+    this.cursorfreezed = false;
+    
+    this.isie = (document.all && !document.opera);
+    
+    this.scrollTop = function(val) {
+      return (val === undefined) ? self.getScrollTop() : self.setScrollTop(val);
+    };
+    
+    this.getScrollTop = function() {
+      return self.docscroll.scrollTop();
+    };
+    this.setScrollTop = function(val) {
+      return self.docscroll.scrollTop(val);
+    };
+    
+    this.hasParent = function(e,id) {
+      var el = e.target||e||false;
+      while (el && el.id != id) {
+        el = el.parentNode||false;
+      }
+      return (el!==false);
+    };
+    
+    this.init = function() {
+      self.doc.css({'overflow-y':'hidden'});
+      var rail = $(document.createElement('div'));
+      rail.attr('id',self.id);
+      rail.css({position:"fixed",top:0,right:0,"padding-left":"4px",width:"12px",height:"100%",'z-index':self.zindex,opacity:self.cursoropacitymin});
+      self.rail = rail;
+      self.doc.append(rail);
+      var cursor = $(document.createElement('div'));
+      cursor.css({
+        position:"relative",top:0,right:0,width:"8px",height:"0px",'background-color':"#424242",
+        border:"1px solid #fff",
+        '-webkit-border-radius':'4px',
+        '-moz-border-radius':'4px',
+        'border-radius':'4px'
+      });
+      self.cursor = cursor;
+      self.rail.append(cursor);
+      
+      self.win.resize(function(){self.onResize()});    
+      self.doc.resize(function(){self.onResize()});    
+      self.onResize();
+
+      $(self.rail).mousedown(function(e) {
+        self.rail.drag = {x:e.screenX,y:e.screenY,sx:self.scroll.x,sy:self.scroll.y};
+        e.preventDefault();
+        return false;
+      });
+      $(self.rail).mouseup(function() {
+        self.rail.drag = false;
+        return false;
+      });
+      
+      $(document).mouseup(function(e) {
+        self.rail.drag = false;      
+        self.hideCursor();
+      });
+      
+      $(document).mousemove(function(e) {
+        if (self.rail.drag) {
+          self.scroll.y = self.rail.drag.sy + (e.screenY-self.rail.drag.y);
+          if (self.scroll.y<0) self.scroll.y=0;
+          var my = self.scrollvaluemax;
+          if (self.scroll.y>my) self.scroll.y=my;
+          self.showCursor();
+          self.cursorfreezed = true;
+          self.doScroll(Math.round(self.scroll.y*self.scrollratio.y));
+          e.preventDefault();
+          return false;
+        }
+      });
+      
+      $(self.rail).mouseenter(function() {
+        $(self.rail).animate({opacity:1});
+        self.rail.active = true;
+      });
+      $(self.rail).mouseleave(function() {
+        self.rail.active = false;
+        if (!self.rail.drag) self.hideCursor();
+      });
+      
+      self.mousewheel(function(delta){
+        self.scroll.y+=(-delta)*12;
+        if (self.scroll.y<0) self.scroll.y=0;
+        var my = self.scrollvaluemax;
+        if (self.scroll.y>my) self.scroll.y=my;
+        self.cursorfreezed = false;
+        self.doScroll(Math.round(self.scroll.y*self.scrollratio.y));
+      });
+    
+    };
+    
+    this.showCursor = function() {
+      if (self.cursortimeout) {
+        clearTimeout(self.cursortimeout);
+        self.cursortimeout = 0;
+      }
+      self.rail.clearQueue().css({opacity:1});
+      self.cursor.css({height:self.cursorheight,top:self.scroll.y});
+    }
+    
+    this.hideCursor = function(tm) {
+      if (self.cursortimeout) return;
+      self.cursortimeout = setTimeout(function() {
+         if (self.rail.active) return;
+         $(self.rail).animate({opacity:self.cursoropacitymin});
+         self.cursortimeout = 0;
+      },tm||800);
+    };
+    
+    this.getContentSize = function() {
+      return (self.doc[0].nodeName=='BODY') ?
+        {
+          w:Math.max(document.body.scrollWidth,document.documentElement.scrollWidth),
+          h:Math.max(document.body.scrollHeight,document.documentElement.scrollHeight)
+        } : 
+        {
+          w:self.doc[0].scrollWidth,
+          h:self.doc[0].scrollHeight
+        };
+    };
+    
+    this.onResize = function() {
+      self.view = {
+        w:self.win.width(),
+        h:self.win.height()
+      };
+      self.page = self.getContentSize();
+      
+      self.cursorheight = Math.round(self.view.h * (self.view.h / self.page.h));
+      
+      self.scrollvaluemax = self.view.h-self.cursorheight-1;
+      
+      self.scrollratio = {
+        x:0,
+        y:((self.page.h - self.view.h)/self.scrollvaluemax)
+      };
+      
+      self.scroll.y = Math.round(self.getScrollTop() * (1/self.scrollratio.y));
+      
+      self.showCursor();
+      self.hideCursor();
+    };
+   
+    this.bind = function(dom,name,fn,bubble) {  // fixing jquery
+      var el = dom[0];
+      if (el.addEventListener) {
+        el.addEventListener(name,fn,bubble||false);
+      } 
+      else if (el.attachEvent) {
+        el.attachEvent(name,fn);
+      } 
+      else {
+        el["on"+name] = fn;
+      }
+    };
+   
+    this.mousewheel = function(fn) {
+      function wheel(e){
+        var delta = 0;
+        e = e ? e : window.event;
+        var delta = e.detail ? e.detail * -1 : e.wheelDelta / 40;
+        if (fn&&delta) fn(delta);
+        if (e.preventDefault) e.preventDefault();
+        e.returnValue = false;
+      }
+      if (!self.isie) self.bind(self.docscroll,'DOMMouseScroll',wheel,false);
+      self.bind(self.docscroll,'mousewheel',wheel,false);
+    };
+    
+    this.doScroll = function(y) {
+      self.newscrolly = y;
+      if (self.timer) return;
+      self.timer = setInterval(function() {
+        var gp = self.newscrolly - self.getScrollTop();
+        var df = (gp>0) ? Math.ceil(gp/4) : Math.floor(gp/4);
+        var sc = self.getScrollTop()+df;
+        self.setScrollTop(sc);
+        if (sc == self.newscrolly) {
+          clearInterval(self.timer);
+          self.timer = 0;        
+          self.cursorfreezed = false;
+        }
+      },opt.scrollspeed);
+    }
+
+    self.win.scroll(function(e) {
+      var tm = (new Date()).getTime();
+      if (!self.lastcontentcheck || self.lastcontentcheck<tm) {
+        self.lastcontentcheck=tm+500;
+        var pg = self.getContentSize();
+        if (pg.h!=self.page.h) self.onResize();        
+      }
+    
+      if (self.rail.drag) return;
+      if (!self.cursorfreezed) self.scroll.y = Math.round(self.getScrollTop() * (1/self.scrollratio.y));
+      self.showCursor();
+      self.hideCursor();
+    });
+   
+    this.init();
+
+  }
+  
+  $.fn.niceScroll = function(opt) {
+    var ret = [];
+    if (!opt) opt = {};
+    this.each(function() {
+      opt.doc = (opt.doc===undefined) ? $(this) : opt.doc;
+      ret.push(new AScrollClass(opt));
+    });
+    return (ret.length==1) ? ret[0] : ret;
+  };
+  
+})( jQuery );
+