Flutter - Drawer class

Flutter 的 Drawer widget 需搭配 Scaffold 使用，可用以設定 Scaffold 左側的選單。

其建構子如下：

Drawer({Key key, double elevation: 16.0, Widget child, String semanticLabel })

屬性如下：

NameTypeDescription
childWidgetThe widget below this widget in the tree.
elevationdoubleThe z-coordinate at which to place this drawer. This controls the size of the shadow below the drawer.
semanticLabelStringThe semantic label of the dialog used by accessibility frameworks to announce screen transitions when the drawer is opened and closed.
hashCodeintThe hash code for this object.
keyKeyControls how one widget replaces another widget in the tree.
runtimeTypeTypeA representation of the runtime type of the object.

方法如下：

NameReturn TypeDescription
build(BuildContext context)WidgetDescribes the part of the user interface represented by this widget.
createElement()StatelessElementCreates a StatelessElement to manage this widget’s location in the tree.
debugDescribeChildren()ListReturns a list of DiagnosticsNode objects describing this node’s children.
debugFillProperties(DiagnosticPropertiesBuilder properties)voidAdd additional properties associated with the node.
noSuchMethod(Invocation invocation)dynamicInvoked when a non-existent method or property is accessed.
toDiagnosticsNode({String name, DiagnosticsTreeStyle style })DiagnosticsNodeReturns a debug representation of the object that is used by debugging tools and by toStringDeep.
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug })StringReturns a string representation of this object.
toStringDeep({String prefixLineOne: ‘’, String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug })StringReturns a string representation of this node and its descendants.
toStringShallow({String joiner: ‘, ‘, DiagnosticLevel minLevel: DiagnosticLevel.debug })StringReturns a one-line detailed description of the object.
toStringShort()StringA short, textual description of this widget.

使用時只要建立出 Drawer 實體，並指給 Scoffold 的 drawer 屬性即可。

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Welcome to Flutter'),
          ),
          drawer: new Drawer())));
}

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可搭配 ListTile 設定 Drawer 選單的選項。

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Welcome to Flutter'),
          ),
          drawer: new Drawer(
            child: new ListView(
              children: <Widget>[
                new ListTile(
                    leading: const Icon(Icons.home), 
                    title: new Text('Home')),
                new ListTile(
                    leading: const Icon(Icons.favorite),
                    title: new Text('Favorite')),
              ],
            ),
          ))));
}

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搭配 DrawerHeader 設定 Drawer 的標頭。

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Welcome to Flutter'),
          ),
          drawer: new Drawer(
            child: new ListView(
              children: <Widget>[
                new DrawerHeader(
                  child: new Text('Drawer Header'),
                  decoration: new BoxDecoration(
                    color: Colors.blue,
                  ),
                ),
                new ListTile(
                  leading: const Icon(Icons.home),
                  title: new Text('Home')
                ),
                new ListTile(
                  leading: const Icon(Icons.favorite),
                  title: new Text('Favorite')
                ),
              ],
            ),
          ))));
}

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搭配 UserAccountsDrawerHeader 設定顯示有使用者資訊的 Drawer 標頭。

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Welcome to Flutter'),
          ),
          drawer: new Drawer(
            child: new ListView(
              children: <Widget>[
                new UserAccountsDrawerHeader(
                    accountName: new Text('LarryNung'),
                    accountEmail: new Text('email@example.com')),
                new ListTile(
                  leading: const Icon(Icons.home),
                  title: new Text('Home')
                ),
                new ListTile(
                  leading: const Icon(Icons.favorite),
                  title: new Text('Favorite')
                ),
              ],
            ),
          ))));
}

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