Add TextStyle fontFamily:, extend support for fontWeight:

sky/sdk/lib/painting/text_style.dart

Index: sky/sdk/lib/painting/text_style.dart
diff --git a/sky/sdk/lib/painting/text_style.dart b/sky/sdk/lib/painting/text_style.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d45929991b6007fb77c11a8b16e15cd62d4e933e
--- /dev/null
+++ b/sky/sdk/lib/painting/text_style.dart
@@ -0,0 +1,135 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:sky';
+
+enum FontWeight {
+  w100,
+  w200,
+  w300,
+  w400,
+  w500,
+  w600,
+  w700,
+  w800,
+  w900
+}
+
+const thin = FontWeight.w100;
+const extraLight = FontWeight.w200;
+const light = FontWeight.w300;
+const normal = FontWeight.w400;
+const medium = FontWeight.w500;
+const semiBold = FontWeight.w600;
+const bold = FontWeight.w700;
+const extraBold = FontWeight.w800;
+const black = FontWeight.w900;
+
+enum TextAlign {
+  left,
+  right,
+  center
+}
+
+class TextStyle {
+  const TextStyle({
+    this.color,
+    this.fontFamily,
+    this.fontSize,
+    this.fontWeight,
+    this.textAlign
+  });
+
+  final Color color;
+  final String fontFamily;
+  final double fontSize; // in pixels
+  final FontWeight fontWeight;
+  final TextAlign textAlign;
+
+  TextStyle copyWith({
+    Color color,
+    double fontSize,
+    FontWeight fontWeight,
+    TextAlign textAlign
+  }) {
+    return new TextStyle(
+      color: color != null ? color : this.color,
+      fontFamily: fontFamily != null ? fontFamily : this.fontFamily,
+      fontSize: fontSize != null ? fontSize : this.fontSize,
+      fontWeight: fontWeight != null ? fontWeight : this.fontWeight,
+      textAlign: textAlign != null ? textAlign : this.textAlign
+    );
+  }
+
+  bool operator ==(other) {
+    return other is TextStyle &&
+      color == other.color &&
+      fontFamily == other.fontFamily && 
+      fontSize == other.fontSize &&
+      fontWeight == other.fontWeight &&
+      textAlign == other.textAlign;
+  }
+
+  int get hashCode {
+    // Use Quiver: https://github.com/domokit/mojo/issues/236
+    int value = 373;
+    value = 37 * value + color.hashCode;
+    value = 37 * value + fontFamily.hashCode;
+    value = 37 * value + fontSize.hashCode;
+    value = 37 * value + fontWeight.hashCode;
+    value = 37 * value + textAlign.hashCode;
+    return value;
+  }
+
+  void applyToCSSStyle(CSSStyleDeclaration cssStyle) {
+    if (color != null) {
+      cssStyle['color'] = 'rgba(${color.red}, ${color.green}, ${color.blue}, ${color.alpha / 255.0})';
+    }
+    // TODO(hansmuller): escape the fontFamily string.
+    if (fontFamily != null) {
+      cssStyle['font-family'] = fontFamily;
+    }
+    if (fontSize != null) {
+      cssStyle['font-size'] = "${fontSize}px";
+    }
+    if (fontWeight != null) {
+      cssStyle['font-weight'] = const {
+        FontWeight.w100: '100',
+        FontWeight.w200: '200',
+        FontWeight.w300: '300',
+        FontWeight.w400: '400',
+        FontWeight.w500: '500',
+        FontWeight.w600: '600',
+        FontWeight.w700: '700',
+        FontWeight.w800: '800',
+        FontWeight.w900: '900'
+      }[fontWeight];
+    }
+    if (textAlign != null) {
+      cssStyle['text-align'] = const {
+        TextAlign.left: 'left',
+        TextAlign.right: 'right',
+        TextAlign.center: 'center',
+      }[textAlign];
+    }
+  }
+
+  String toString([String prefix = '']) {
+    List<String> result = [];
+    if (color != null)
+      result.add('${prefix}color: $color');
+    // TODO(hansmuller): escape the fontFamily string.
+    if (fontFamily != null)
+      result.add('${prefix}fontFamily: "${fontFamily}"');
+    if (fontSize != null)
+      result.add('${prefix}fontSize: $fontSize');
+    if (fontWeight != null)
+      result.add('${prefix}fontWeight: $fontWeight');
+    if (textAlign != null)
+      result.add('${prefix}textAlign: $textAlign');
+    if (result.isEmpty)
+      return '${prefix}<no style specified>';
+    return result.join('\n');
+  }
+}