source: admin/js/tool-man/coordinates.js @ 0:54703be25dd6

/* Copyright (c) 2005 Tim Taylor Consulting (see LICENSE.txt) */

/* FIXME: assumes position styles are specified in 'px' */

ToolMan._coordinatesFactory = {
     
     create : function(x, y) {
          // FIXME: Safari won't parse 'throw' and aborts trying to do anything with this file
          //if (isNaN(x) || isNaN(y)) throw "invalid x,y: " + x + "," + y
          return new _ToolManCoordinate(this, x, y)
     },
     
     origin : function() {
          return this.create(0, 0)
     },
     
     /*
      * FIXME: Safari 1.2, returns (0,0) on absolutely positioned elements
      */
     topLeftPosition : function(element) {
          var left = parseInt(ToolMan.css().readStyle(element, "left"))
          var left = isNaN(left) ? 0 : left
          var top = parseInt(ToolMan.css().readStyle(element, "top"))
          var top = isNaN(top) ? 0 : top
          
          return this.create(left, top)
     },
     
     bottomRightPosition : function(element) {
          return this.topLeftPosition(element).plus(this._size(element))
     },
     
     topLeftOffset : function(element) {
          var offset = this._offset(element) 
          
          var parent = element.offsetParent
          while (parent) {
               offset = offset.plus(this._offset(parent))
               parent = parent.offsetParent
          }
          return offset
     },
     
     bottomRightOffset : function(element) {
          return this.topLeftOffset(element).plus(
                    this.create(element.offsetWidth, element.offsetHeight))
     },
     
     scrollOffset : function() {
          if (window.pageXOffset) {
               return this.create(window.pageXOffset, window.pageYOffset)
          } else if (document.documentElement) {
               return this.create(
                         document.body.scrollLeft + document.documentElement.scrollLeft, 
                         document.body.scrollTop + document.documentElement.scrollTop)
          } else if (document.body.scrollLeft >= 0) {
               return this.create(document.body.scrollLeft, document.body.scrollTop)
          } else {
               return this.create(0, 0)
          }
     },
     
     clientSize : function() {
          if (window.innerHeight >= 0) {
               return this.create(window.innerWidth, window.innerHeight)
          } else if (document.documentElement) {
               return this.create(document.documentElement.clientWidth,
                         document.documentElement.clientHeight)
          } else if (document.body.clientHeight >= 0) {
               return this.create(document.body.clientWidth,
                         document.body.clientHeight)
          } else {
               return this.create(0, 0)
          }
     },
     
     /**
      * mouse coordinate relative to the window (technically the
      * browser client area) i.e. the part showing your page
      *
      * NOTE: in Safari the coordinate is relative to the document
      */
     mousePosition : function(event) {
          event = ToolMan.events().fix(event)
          return this.create(event.clientX, event.clientY)
     },
     
     /**
      * mouse coordinate relative to the document
      */
     mouseOffset : function(event) {
          event = ToolMan.events().fix(event)
          if (event.pageX >= 0 || event.pageX < 0) {
               return this.create(event.pageX, event.pageY)
          } else if (event.clientX >= 0 || event.clientX < 0) {
               return this.mousePosition(event).plus(this.scrollOffset())
          }
     },
     
     _size : function(element) {
     /* TODO: move to a Dimension class */
          return this.create(element.offsetWidth, element.offsetHeight)
     },
     
     _offset : function(element) {
          return this.create(element.offsetLeft, element.offsetTop)
     }
}

function _ToolManCoordinate(factory, x, y) {
     this.factory = factory
     this.x = isNaN(x) ? 0 : x
     this.y = isNaN(y) ? 0 : y
}

_ToolManCoordinate.prototype = {
     toString : function() {
          return "(" + this.x + "," + this.y + ")"
     },
     
     plus : function(that) {
          return this.factory.create(this.x + that.x, this.y + that.y)
     },
     
     minus : function(that) {
          return this.factory.create(this.x - that.x, this.y - that.y)
     },
     
     min : function(that) {
          return this.factory.create(
                    Math.min(this.x , that.x), Math.min(this.y , that.y))
     },
     
     max : function(that) {
          return this.factory.create(
                    Math.max(this.x , that.x), Math.max(this.y , that.y))
     },
     
     constrainTo : function (one, two) {
          var min = one.min(two)
          var max = one.max(two)
          
          return this.max(min).min(max)
     },
     
     distance : function (that) {
          return Math.sqrt(Math.pow(this.x - that.x, 2) + Math.pow(this.y - that.y, 2))
     },
     
     reposition : function(element) {
          element.style["top"] = this.y + "px"
          element.style["left"] = this.x + "px"
     }
}