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Correct ListItem leading/trailing widget layout (#3820)

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This commit is contained in:
Hans Muller 2016-05-09 15:23:47 -07:00
parent a6a3f2c389
commit 4d8f38e538
1 changed files with 6 additions and 12 deletions
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18
packages/flutter/lib/src/material/list_item.dart
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@ -43,9 +43,7 @@ class ListItem extends StatelessWidget {
this.enabled: true,
this.onTap,
this.onLongPress
}) : super(key: key) {
assert(isThreeLine ? subtitle != null : true);
}
}) : super(key: key);
/// A widget to display before the title.
///
@ -149,19 +147,15 @@ class ListItem extends StatelessWidget {
else
itemHeight = dense ? 76.0 : 88.0;
double iconMarginTop = 0.0;
if (isThreeLine)
iconMarginTop = dense ? 8.0 : 16.0;
// Overall, the list item is a Row() with these children.
final List<Widget> children = <Widget>[];
if (leading != null) {
children.add(new Container(
margin: new EdgeInsets.only(right: 16.0, top: iconMarginTop),
margin: const EdgeInsets.only(right: 16.0),
width: 40.0,
child: new Align(
alignment: new FractionalOffset(0.0, isThreeLine ? 0.0 : 0.5),
alignment: FractionalOffset.centerLeft,
child: leading
)
));
@ -173,7 +167,7 @@ class ListItem extends StatelessWidget {
child: title ?? new Container()
);
Widget center = primaryLine;
if (isTwoLine || isThreeLine) {
if (subtitle != null && (isTwoLine || isThreeLine)) {
center = new Column(
mainAxisAlignment: MainAxisAlignment.collapse,
crossAxisAlignment: CrossAxisAlignment.start,
@ -193,9 +187,9 @@ class ListItem extends StatelessWidget {
if (trailing != null) {
children.add(new Container(
margin: new EdgeInsets.only(left: 16.0, top: iconMarginTop),
margin: const EdgeInsets.only(left: 16.0),
child: new Align(
alignment: new FractionalOffset(1.0, isThreeLine ? 0.0 : 0.5),
alignment: FractionalOffset.centerRight,
child: trailing
)
));