介绍:

GirdView的item展现形式,会在item控件上层浮现网格,用于WidgetApp视图开发,其实在MaterialApp中把debugShowMaterialGird开启,也是默认显示GridPaper;
GridTileBar通常用来做GridTile的header或footer组件;
GridTile主要作为GridView子child,提供丰富的页眉和页脚;

使用:

作为子child可以在GirdView中使用,或者其他控件中也可以.

代码:

class MyGridPaper extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Girdpaper'),
          centerTitle: true,
        ),
        body: _contentWidget());
  }

  Widget _contentWidget() {
    return Container(
//      height: 400.0,
//      width: 300.0,
      color: Colors.grey,
      child: GridView.count(
        crossAxisCount: 2,
        mainAxisSpacing: 10.0,
        crossAxisSpacing: 4.0,
        padding: const EdgeInsets.all(10.0),
        childAspectRatio: 1.3,
        children: <Widget>[
          GridTile(
            header: GridTileBar(
              title: Text('title'),
              subtitle: Text('subtitle'),
              leading: Icon(Icons.add),
              trailing: Text("trailing"),
            ),
            child: Container(),
            footer: Text('footer'),
          ),
          GridPaper(
            interval:1.0,
            divisions: 1,
            subdivisions: 1,
            color: Colors.red,
            child: Image.network(
                'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
                scale: 1,
                fit: BoxFit.cover),
          ),
          Image.network(
              'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
              scale: 1,
              fit: BoxFit.cover),
          Image.network(
              'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
              scale: 1,
              fit: BoxFit.cover),
          Image.network(
              'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
              scale: 1,
              fit: BoxFit.cover),
          Image.network(
              'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
              scale: 1,
              fit: BoxFit.cover),
          Image.network(
              'https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png',
              scale: 1,
              fit: BoxFit.cover),
        ],
      ),
    );
  }
}

主要是在GridView中添加了GridTile->GridPaper;

继承关系:

GridPaper:
Object > Diagnosticable > DiagnosticableTree > Widget > StatelessWidget > GridPaper

GridTile:
Object > Diagnosticable > DiagnosticableTree > Widget > StatelessWidget > GridTile

GridTileBar:
Object > Diagnosticable > DiagnosticableTree > Widget > StatelessWidget > GridTileBar

构造函数:

GridPaper:
GridPaper({Key key, Color color: const Color(0x7FC3E8F3), double interval: 100.0, int divisions: 2, int subdivisions: 5, Widget child })

GridTile:
const GridTile({
Key key,
this.header,
this.footer,
@required this.child,
}) : assert(child != null),
super(key: key);

GridTileBar:
const GridTileBar({
Key key,
this.backgroundColor,
this.leading,
this.title,
this.subtitle,
this.trailing
}) : super(key: key);

属性

GridPaper:

• child → Widget 子widget
• color → Color 网格颜色
• divisions → int 主网格单元内分区数,默认值2
• interval → double 网格中线的距离单位,以像素为单位,默认值100.0
• subdivisions → int 主网格中小网格的数,默认值5

GridTile:

• header → Widget 页眉
• footer → Widget 页脚
• child → Widget 子widget

GridTileBar:

• backgroundColor → Color 背景颜色
• leading → Widget 标题前显示的小组件,通常是一个icon
• title → Widget 标题
• subtitle → Widget 子标题
• trailing → Widget 标题后显示的小组件,通常是icon或者iconButton

样式:

image.png