third_party/polymer/components-chromium/core-splitter/core-splitter-extracted.js

   1
   2
   3   Polymer('core-splitter', {
   4
   5     /**
   6      * Possible values are "left", "right", "up" and "down".
   7      *
   8      * @attribute direction
   9      * @type string
  10      * @default 'left'
  11      */
  12     direction: 'left',
  13
  14     /**
  15      * Minimum width to which the splitter target can be sized
  16      *
  17      * @attribute minSize
  18      * @type number
  19      * @default 0
  20      */
  21     minSize: 0,
  22
  23     /**
  24      * Locks the split bar so it can't be dragged.
  25      *
  26      * @attribute locked
  27      * @type boolean
  28      * @default false
  29      */
  30     locked: false,
  31
  32     /**
  33      * By default the parent and siblings of the splitter are set to overflow hidden. This helps
  34      * avoid elements bleeding outside the splitter regions. Set this property to true to allow
  35      * these elements to overflow.
  36      *
  37      * @attribute allowOverflow
  38      * @type boolean
  39      * @default false
  40      */
  41     allowOverflow: false,
  42
  43     ready: function() {
  44       this.directionChanged();
  45     },
  46
  47     domReady: function() {
  48       if (!this.allowOverflow) {
  49         this.parentNode.style.overflow = this.nextElementSibling.style.overflow =
  50             this.previousElementSibling.style.overflow = 'hidden';
  51       }
  52     },
  53
  54     directionChanged: function() {
  55       this.isNext = this.direction === 'right' || this.direction === 'down';
  56       this.horizontal = this.direction === 'up' || this.direction === 'down';
  57       this.update();
  58     },
  59
  60     update: function() {
  61       this.target = this.isNext ? this.nextElementSibling : this.previousElementSibling;
  62       this.dimension = this.horizontal ? 'height' : 'width';
  63       this.classList.toggle('horizontal', this.horizontal);
  64     },
  65
  66     targetChanged: function(old) {
  67       if (old) {
  68         old.style[old.__splitterMinSize] = '';
  69       }
  70       var min = this.target.__splitterMinSize = this.horizontal ? 'minHeight' : 'minWidth';
  71       this.target.style[min] = this.minSize + 'px';
  72     },
  73
  74     trackStart: function() {
  75       this.update();
  76       this.size = parseInt(getComputedStyle(this.target)[this.dimension]);
  77     },
  78
  79     track: function(e) {
  80       if (this.locked) {
  81         return;
  82       }
  83       var d = e[this.horizontal ? 'dy' : 'dx'];
  84       this.target.style[this.dimension] =
  85           this.size + (this.isNext ? -d : d) + 'px';
  86     },
  87
  88     preventSelection: function(e) {
  89       e.preventDefault();
  90     }
  91   });
  92