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Introduce Align widget for aligning children.

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This commit is contained in:
Hixie 2015-08-25 15:32:58 -07:00
parent a2286ee7a1
commit 4a2fb5d3e8
1 changed files with 16 additions and 4 deletions
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20
packages/flutter/lib/widgets/basic.dart
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@ -183,14 +183,26 @@ class Padding extends OneChildRenderObjectWrapper {
}
}
class Center extends OneChildRenderObjectWrapper {
Center({ Key key, Widget child })
class Align extends OneChildRenderObjectWrapper {
Align({ Key key, this.horizontal: 0.5, this.vertical: 0.5, Widget child })
: super(key: key, child: child);
RenderPositionedBox createNode() => new RenderPositionedBox();
final double horizontal;
final double vertical;
RenderPositionedBox createNode() => new RenderPositionedBox(horizontal: horizontal, vertical: vertical);
RenderPositionedBox get renderObject => super.renderObject;
// Nothing to sync, so we don't implement syncRenderObject()
void syncRenderObject(SizedBox old) {
super.syncRenderObject(old);
renderObject.horizontal = horizontal;
renderObject.vertical = vertical;
}
}
class Center extends Align {
Center({ Key key, Widget child })
: super(key: key, child: child);
}
class SizedBox extends OneChildRenderObjectWrapper {