Initial commit of Effen reactive framework experiment for Sky

sky/examples/stocks-fn/stockrow.dart

+part of stocksapp;
+
+class StockRow extends Component {
+
+  Stock stock;
+  LinkedHashSet<SplashAnimation> _splashes;
+
+  static Style _style = new Style('''
+    transform: translateX(0);
+    max-height: 48px;
+    display: flex;
+    align-items: center;
+    border-bottom: 1px solid #F4F4F4;
+    padding-top: 16px;
+    padding-left: 16px;
+    padding-right: 16px;
+    padding-bottom: 20px;'''
+  );
+
+  static Style _tickerStyle = new Style('''
+    flex: 1;
+    font-family: 'Roboto Medium', 'Helvetica';'''
+  );
+
+  static Style _lastSaleStyle = new Style('''
+    text-align: right;
+    padding-right: 16px;'''
+  );
+
+  static Style _changeStyle = new Style('''
+    color: #8A8A8A;
+    text-align: right;'''
+  );
+
+  StockRow({Stock stock}) : super(key: stock.symbol) {
+    this.stock = stock;
+  }
+
+  Node render() {
+    String lastSale = "\$${stock.lastSale.toStringAsFixed(2)}";
+
+    String changeInPrice = "${stock.percentChange.toStringAsFixed(2)}%";
+    if (stock.percentChange > 0)
+      changeInPrice = "+" + changeInPrice;
+
+    List<Node> children = [
+      new StockArrow(
+        percentChange: stock.percentChange
+      ),
+      new Container(
+        key: 'Ticker',
+        style: _tickerStyle,
+        children: [new Text(stock.symbol)]
+      ),
+      new Container(
+        key: 'LastSale',
+        style: _lastSaleStyle,
+        children: [new Text(lastSale)]
+      ),
+      new Container(
+        key: 'Change',
+        style: _changeStyle,
+        children: [new Text(changeInPrice)]
+      )
+    ];
+
+    if (_splashes != null) {
+      children.addAll(_splashes.map((s) => new InkSplash(s.onStyleChanged)));
+    }
+
+    return new Container(
+      style: _style,
+      onScrollStart: _cancelSplashes,
+      onWheel: _cancelSplashes,
+      onPointerDown: _handlePointerDown,
+      children: children
+    );
+  }
+
+  sky.ClientRect _getBoundingRect() => getRoot().getBoundingClientRect();
+
+  void _handlePointerDown(sky.Event event) {
+    setState(() {
+      if (_splashes == null) {
+        _splashes = new LinkedHashSet<SplashAnimation>();
+      }
+
+      var splash;
+      splash = new SplashAnimation(_getBoundingRect(), event.x, event.y,
+                                   onDone: () { _splashDone(splash); });
+
+      _splashes.add(splash);
+    });
+  }
+
+  void _cancelSplashes(sky.Event event) {
+    if (_splashes == null) {
+      return;
+    }
+
+    setState(() {
+      var splashes = _splashes;
+      _splashes = null;
+      splashes.forEach((s) { s.cancel(); });
+    });
+  }
+
+  void willUnmount() {
+    _cancelSplashes(null);
+  }
+
+  void _splashDone(SplashAnimation splash) {
+    if (_splashes == null) {
+      return;
+    }
+
+    setState(() {
+      _splashes.remove(splash);
+      if (_splashes.length == 0) {
+        _splashes = null;
+      }
+    });
+  }
+}