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third_party/polymer/v0_8/components-chromium/iron-range-behavior/iron-range-behavior-extracted.js

Index: third_party/polymer/v0_8/components-chromium/iron-range-behavior/iron-range-behavior-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/iron-range-behavior/iron-range-behavior-extracted.js b/third_party/polymer/v0_8/components-chromium/iron-range-behavior/iron-range-behavior-extracted.js
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index 0000000000000000000000000000000000000000..ce733745cafb60ec55844f4bbbcf649ff2e4713e
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@@ -0,0 +1,88 @@
+
+
+ /** 
+ * `iron-range-behavior` provides the behavior for something with a minimum to maximum range.
+ *
+ * @demo demo/index.html
+ * @polymerBehavior 
+ */
+ Polymer.IronRangeBehavior = {
+
+  properties: {
+
+    /**
+     * The number that represents the current value.
+     */
+    value: {
+      type: Number,
+      value: 0,
+      notify: true,
+      reflectToAttribute: true
+    },
+
+    /**
+     * The number that indicates the minimum value of the range.
+     */
+    min: {
+      type: Number,
+      value: 0,
+      notify: true
+    },
+
+    /**
+     * The number that indicates the maximum value of the range.
+     */
+    max: {
+      type: Number,
+      value: 100,
+      notify: true
+    },
+
+    /**
+     * Specifies the value granularity of the range's value.
+     */
+    step: {
+      type: Number,
+      value: 1,
+      notify: true
+    },
+
+    /**
+     * Returns the ratio of the value.
+     */
+    ratio: {
+      type: Number,
+      value: 0,
+      readOnly: true,
+      notify: true
+    },
+  },
+
+  observers: [
+    '_update(value, min, max, step)'
+  ],
+
+  _calcRatio: function(value) {
+    return (this._clampValue(value) - this.min) / (this.max - this.min);
+  },
+
+  _clampValue: function(value) {
+    return Math.min(this.max, Math.max(this.min, this._calcStep(value)));
+  },
+
+  _calcStep: function(value) {
+    return this.step ? (Math.round(value / this.step) / (1 / this.step)) : value;
+  },
+
+  _validateValue: function() {
+    var v = this._clampValue(this.value);
+    this.value = this.oldValue = isNaN(v) ? this.oldValue : v;
+    return this.value !== v;
+  },
+
+  _update: function() {
+    this._validateValue();
+    this._setRatio(this._calcRatio(this.value) * 100);
+  }
+
+};