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

Index: third_party/polymer/v0_8/components-chromium/iron-fit-behavior/iron-fit-behavior-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/iron-fit-behavior/iron-fit-behavior-extracted.js b/third_party/polymer/v0_8/components-chromium/iron-fit-behavior/iron-fit-behavior-extracted.js
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@@ -0,0 +1,217 @@
+
+
+/**
+Polymer.IronFitBehavior fits an element in another element using `max-height` and `max-width`, and
+optionally centers it in the window or another element.
+
+The element will only be sized and/or positioned if it has not already been sized and/or positioned
+by CSS.
+
+CSS properties               | Action
+-----------------------------|-------------------------------------------
+`position` set               | Element is not centered horizontally or vertically
+`top` or `bottom` set        | Element is not vertically centered
+`left` or `right` set        | Element is not horizontally centered
+`max-height` or `height` set | Element respects `max-height` or `height`
+`max-width` or `width` set   | Element respects `max-width` or `width`
+
+@demo demo/index.html
+@polymerBehavior
+*/
+
+  Polymer.IronFitBehavior = {
+
+    properties: {
+
+      /**
+       * The element that will receive a `max-height`/`width`. By default it is the same as `this`,
+       * but it can be set to a child element. This is useful, for example, for implementing a
+       * scrolling region inside the element.
+       */
+      sizingTarget: {
+        type: Object,
+        value: function() {
+          return this;
+        }
+      },
+
+      /**
+       * The element to fit `this` into.
+       */
+      fitInto: {
+        type: Object,
+        value: window
+      },
+
+      /**
+       * Set to true to auto-fit on attach.
+       */
+      autoFitOnAttach: {
+        type: Boolean,
+        value: false
+      },
+
+      _fitInfo: {
+        type: Object
+      }
+
+    },
+
+    get _fitWidth() {
+      var fitWidth;
+      if (this.fitInto === window) {
+        fitWidth = this.fitInto.innerWidth;
+      } else {
+        fitWidth = this.fitInto.getBoundingClientRect().width;
+      }
+      return fitWidth;
+    },
+
+    get _fitHeight() {
+      var fitHeight;
+      if (this.fitInto === window) {
+        fitHeight = this.fitInto.innerHeight;
+      } else {
+        fitHeight = this.fitInto.getBoundingClientRect().height;
+      }
+      return fitHeight;
+    },
+
+    attached: function() {
+      if (this.autoFitOnAttach) {
+        if (window.getComputedStyle(this).display === 'none') {
+          setTimeout(function() {
+            this.fit();
+          }.bind(this));
+        } else {
+          this.fit();
+        }
+      }
+    },
+
+    /**
+     * Fits and optionally centers the element into the window, or `fitInfo` if specified.
+     */
+    fit: function() {
+      this._discoverInfo();
+      this.constrain();
+      this.center();
+    },
+
+    /**
+     * Memoize information needed to position and size the target element.
+     */
+    _discoverInfo: function() {
+      if (this._fitInfo) {
+        return;
+      }
+      var target = window.getComputedStyle(this);
+      var sizer = window.getComputedStyle(this.sizingTarget);
+      this._fitInfo = {
+        positionedBy: {
+          vertically: target.top !== 'auto' ? 'top' : (target.bottom !== 'auto' ?
+            'bottom' : null),
+          horizontally: target.left !== 'auto' ? 'left' : (target.right !== 'auto' ?
+            'right' : null),
+          css: target.position
+        },
+        sizedBy: {
+          height: sizer.maxHeight !== 'none',
+          width: sizer.maxWidth !== 'none'
+        },
+        margin: {
+          top: parseInt(target.marginTop, 10) || 0,
+          right: parseInt(target.marginRight, 10) || 0,
+          bottom: parseInt(target.marginBottom, 10) || 0,
+          left: parseInt(target.marginLeft, 10) || 0
+        }
+      };
+    },
+
+    /**
+     * Resets the target element's position and size constraints, and clear
+     * the memoized data.
+     */
+    resetFit: function() {
+      if (!this._fitInfo || !this._fitInfo.sizedBy.height) {
+        this.sizingTarget.style.maxHeight = '';
+        this.style.top = '';
+      }
+      if (!this._fitInfo || !this._fitInfo.sizedBy.width) {
+        this.sizingTarget.style.maxWidth = '';
+        this.style.left = '';
+      }
+      if (this._fitInfo) {
+        this.style.position = this._fitInfo.positionedBy.css;
+      }
+      this._fitInfo = null;
+    },
+
+    /**
+     * Equivalent to calling `resetFit()` and `fit()`. Useful to call this after the element,
+     * the window, or the `fitInfo` element has been resized.
+     */
+    refit: function() {
+      this.resetFit();
+      this.fit();
+    },
+
+    /**
+     * Constrains the size of the element to the window or `fitInfo` by setting `max-height`
+     * and/or `max-width`.
+     */
+    constrain: function() {
+      var info = this._fitInfo;
+      // position at (0px, 0px) if not already positioned, so we can measure the natural size.
+      if (!this._fitInfo.positionedBy.vertically) {
+        this.style.top = '0px';
+      }
+      if (!this._fitInfo.positionedBy.horizontally) {
+        this.style.left = '0px';
+      }
+      // need border-box for margin/padding
+      this.sizingTarget.style.boxSizing = 'border-box';
+      // constrain the width and height if not already set
+      var rect = this.getBoundingClientRect();
+      if (!info.sizedBy.height) {
+        this._sizeDimension(rect, info.positionedBy.vertically, 'top', 'bottom', 'Height');
+      }
+      if (!info.sizedBy.width) {
+        this._sizeDimension(rect, info.positionedBy.horizontally, 'left', 'right', 'Width');
+      }
+    },
+
+    _sizeDimension: function(rect, positionedBy, start, end, extent) {
+      var info = this._fitInfo;
+      var max = extent === 'Width' ? this._fitWidth : this._fitHeight;
+      var flip = (positionedBy === end);
+      var offset = flip ? max - rect[end] : rect[start];
+      var margin = info.margin[flip ? start : end];
+      var offsetExtent = 'offset' + extent;
+      var sizingOffset = this[offsetExtent] - this.sizingTarget[offsetExtent];
+      this.sizingTarget.style['max' + extent] = (max - margin - offset - sizingOffset) + 'px';
+    },
+
+    /**
+     * Centers horizontally and vertically if not already positioned. This also sets
+     * `position:fixed`.
+     */
+    center: function() {
+      if (!this._fitInfo.positionedBy.vertically || !this._fitInfo.positionedBy.horizontally) {
+        // need position:fixed to center
+        this.style.position = 'fixed';
+      }
+      if (!this._fitInfo.positionedBy.vertically) {
+        var top = (this._fitHeight - this.offsetHeight) / 2;
+        top -= this._fitInfo.margin.top;
+        this.style.top = top + 'px';
+      }
+      if (!this._fitInfo.positionedBy.horizontally) {
+        var left = (this._fitWidth - this.offsetWidth) / 2;
+        left -= this._fitInfo.margin.left;
+        this.style.left = left + 'px';
+      }
+    }
+
+  };
+