plugins/unzoom.js

   1 // Copyright (c) 2013 Google, Inc.
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining a copy
   4 // of this software and associated documentation files (the "Software"), to deal
   5 // in the Software without restriction, including without limitation the rights
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   7 // copies of the Software, and to permit persons to whom the Software is
   8 // furnished to do so, subject to the following conditions:
   9 //
  10 // The above copyright notice and this permission notice shall be included in
  11 // all copies or substantial portions of the Software.
  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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  18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  19 // THE SOFTWARE.
  20
  21
  22 /**
  23  * @fileoverview Plug-in for providing unzoom-on-hover.
  24  *
  25  * @author konigsberg@google.com (Robert Konigsberg)
  26  */
  27 Dygraph.Plugins.Unzoom = (function() {
  28
  29   "use strict";
  30
  31   /**
  32    * Create a new instance.
  33    *
  34    * @constructor
  35    */
  36   var unzoom = function() {
  37     this.button_ = null;
  38   };
  39
  40   unzoom.prototype.toString = function() {
  41     return 'Unzoom Plugin';
  42   };
  43
  44   unzoom.prototype.activate = function(g) {
  45     return {
  46       willDrawChart: this.willDrawChart
  47     };
  48   };
  49
  50   unzoom.prototype.willDrawChart = function(e) {
  51     var g = e.dygraph;
  52
  53     if (this.button_ != null) {
  54       return;
  55     }
  56
  57     this.button_ = document.createElement('button');
  58     this.button_.innerHTML = 'Unzoom';
  59     this.button_.style.display = 'none';
  60     this.button_.style.position = 'absolute';
  61     this.button_.style.top = '2px';
  62     this.button_.style.left = '59px';
  63     this.button_.style.zIndex = 1000;
  64     var parent = g.graphDiv;
  65     parent.insertBefore(this.button_, parent.firstChild);
  66
  67     var self = this;
  68     this.button_.onclick = function() {
  69       // TODO(konigsberg): doUnzoom_ is private.
  70       g.doUnzoom_();
  71     }
  72     g.addEvent(parent, 'mouseover', function() {
  73       self.button_.style.display='block';
  74     });
  75
  76     // TODO(konigsberg): Don't show unless the graph is zoomed.
  77     g.addEvent(parent, 'mouseout', function() {
  78       self.button_.style.display='none';
  79     });
  80   };
  81
  82   unzoom.prototype.destroy = function() {
  83     this.button_.parentElement.removeChild(this.button_);
  84   };
  85
  86   return unzoom;
  87
  88 })();