Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/src/lib/template/x-array-selector-extracted.js

Index: third_party/polymer/v0_8/components-chromium/polymer/src/lib/template/x-array-selector-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/polymer/src/lib/template/x-array-selector-extracted.js b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/template/x-array-selector-extracted.js
new file mode 100644
index 0000000000000000000000000000000000000000..c794f644166ac469eab1017923c9ca6d17573f0c
--- /dev/null
+++ b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/template/x-array-selector-extracted.js
@@ -0,0 +1,113 @@
+
+
+  Polymer({
+    is: 'x-array-selector',
+    
+    properties: {
+
+      /**
+       * An array containing items from which selection will be made.
+       */
+      items: {
+        type: Array,
+        observer: '_itemsChanged'
+      },
+
+      /**
+       * When `multi` is true, this is an array that contains any selected.
+       * When `multi` is false, this is the currently selected item, or `null`
+       * if no item is selected.
+       */
+      selected: {
+        type: Object,
+        notify: true
+      },
+
+      /**
+       * When `true`, calling `select` on an item that is already selected
+       * will deselect the item.
+       */
+      toggle: Boolean,
+
+      /**
+       * When `true`, multiple items may be selected at once (in this case,
+       * `selected` is an array of currently selected items).  When `false`,
+       * only one item may be selected at a time.
+       */
+      multi: Boolean
+    },
+    
+    _itemsChanged: function() {
+      // Unbind previous selection
+      if (Array.isArray(this.selected)) {
+        for (var i=0; i<this.selected.length; i++) {
+          this.unbindPaths('selected.' + i);
+        }
+      } else {
+        this.unbindPaths('selected');
+      }
+      // Initialize selection
+      if (this.multi) {
+        this.selected = [];
+      } else {
+        this.selected = null;
+      }
+    },
+
+    /**
+     * Deselects the given item if it is already selected.
+     */
+    deselect: function(item) {
+      if (this.multi) {
+        var scol = Polymer.Collection.get(this.selected);
+        // var skey = scol.getKey(item);
+        // if (skey >= 0) {
+        var sidx = this.selected.indexOf(item);
+        if (sidx >= 0) {
+          var skey = scol.getKey(item);
+          this.selected.splice(sidx, 1);
+          // scol.remove(item);
+          this.unbindPaths('selected.' + skey);
+          return true;
+        }
+      } else {
+        this.selected = null;
+        this.unbindPaths('selected');
+      }
+    },
+
+    /**
+     * Selects the given item.  When `toggle` is true, this will automatically
+     * deselect the item if already selected.
+     */
+    select: function(item) {
+      var icol = Polymer.Collection.get(this.items);
+      var key = icol.getKey(item);
+      if (this.multi) {
+        // var sidx = this.selected.indexOf(item);
+        // if (sidx < 0) {
+        var scol = Polymer.Collection.get(this.selected);
+        var skey = scol.getKey(item);
+        if (skey >= 0) {
+          this.deselect(item);
+        } else if (this.toggle) {
+          this.selected.push(item);
+          // this.bindPaths('selected.' + sidx, 'items.' + skey);
+          // skey = Polymer.Collection.get(this.selected).add(item);
+          this.async(function() {
+            skey = scol.getKey(item);
+            this.bindPaths('selected.' + skey, 'items.' + key);
+          });
+        }
+      } else {
+        if (this.toggle && item == this.selected) {
+          this.deselect();
+        } else {
+          this.bindPaths('selected', 'items.' + key);
+          this.selected = item;
+        }
+      }
+    }
+
+  });
+