Add |constraints| to Container for PopupMenuItem

sky/sdk/lib/framework/rendering/box.dart

 // 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:math' as math;
 import 'dart:sky' as sky;
 import 'dart:typed_data';
 import 'object.dart';
 import 'package:vector_math/vector_math.dart';
 import 'package:sky/framework/net/image_cache.dart' as image_cache;
@@ skipping 59 matching lines @@
     double horizontal = edges.left + edges.right;
     double vertical = edges.top + edges.bottom;
     return new BoxConstraints(
       minWidth: math.max(0.0, minWidth - horizontal),
       maxWidth: maxWidth - horizontal,
       minHeight: math.max(0.0, minHeight - vertical),
       maxHeight: maxHeight - vertical
     );
   }
 
+  BoxConstraints apply(BoxConstraints constraints) {
+    return new BoxConstraints(
+      minWidth: math.max(minWidth, constraints.minWidth),
+      maxWidth: math.min(maxWidth, constraints.maxWidth),
+      minHeight: math.max(minHeight, constraints.minHeight),
+      maxHeight: math.min(maxHeight, constraints.maxHeight));
+  }
+
   final double minWidth;
   final double maxWidth;
   final double minHeight;
   final double maxHeight;
 
   double constrainWidth(double width) {
     return clamp(min: minWidth, max: maxWidth, value: width);
   }
 
   double constrainHeight(double height) {
@@ skipping 95 matching lines @@
     if (child != null)
       child.paint(canvas);
   }
 }
 
 class RenderSizedBox extends RenderProxyBox {
 
   RenderSizedBox({
     RenderBox child,
     Size desiredSize: Size.infinite
-  }) : super(child) {
+  }) : super(child), _desiredSize = desiredSize {
     assert(desiredSize != null);
-    this.desiredSize = desiredSize;
   }
 
   Size _desiredSize;
   Size get desiredSize => _desiredSize;
   void set desiredSize (Size value) {
     assert(value != null);
     if (_desiredSize == value)
       return;
     _desiredSize = value;
     markNeedsLayout();
   }
 
   Size getIntrinsicDimensions(BoxConstraints constraints) {
     return constraints.constrain(_desiredSize);
   }
 
   void performLayout() {
     size = constraints.constrain(_desiredSize);
     if (child != null)
       child.layout(new BoxConstraints.tight(size));
   }
 
   String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}desiredSize: ${desiredSize}\n';
 }
 
+class RenderConstrainedBox extends RenderProxyBox {
+  RenderConstrainedBox({
+    RenderBox child,
+    BoxConstraints additionalConstraints
+  }) : super(child), _additionalConstraints = additionalConstraints {
+    assert(additionalConstraints != null);
+  }
+
+  BoxConstraints _additionalConstraints;
+  BoxConstraints get additionalConstraints => _additionalConstraints;
+  void set additionalConstraints (BoxConstraints value) {
+    assert(value != null);
+    if (_additionalConstraints == value)
+      return;
+    _additionalConstraints = value;
+    markNeedsLayout();
+  }
+
+  Size getIntrinsicDimensions(BoxConstraints constraints) {
+    if (child == null)
+      return constraints.constrain(Size.zero);
+    return child.getIntrinsicDimensions(constraints.apply(_additionalConstraints));
+  }
+
+  void performLayout() {
+    if (child != null) {
+      child.layout(constraints.apply(_additionalConstraints));
+      size = child.size;
+    } else {
+      performResize();
+    }
+  }
+
+  String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}additionalConstraints: ${additionalConstraints}\n';
+}
+
 class RenderClip extends RenderProxyBox {
   RenderClip({ RenderBox child }) : super(child);
 
   void paint(RenderObjectDisplayList canvas) {
     if (child != null) {
       canvas.save();
       canvas.clipRect(new Rect.fromSize(size));
       child.paint(canvas);
       canvas.restore();
     }
@@ skipping 566 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }