MessageBox class

An informational message box widget with icon, label, and optional actions.

This widget creates a styled message container with an icon on the left, message content in the center, and optional action buttons on the right. Perfect for alerts, notifications, info boxes, warnings, and error messages.

Features:

  • Icon + message + actions layout
  • Customizable colors (main color and background)
  • Default icon (Icons.info_outline) when not specified
  • Automatic background color (10% opacity of main color)
  • Optional action buttons
  • Customizable border and border radius
  • Adjustable padding and margin

Example:

MessageBox(
  label: Text("This is an important message"),
  icon: Icon(Icons.warning),
  color: Colors.orange,
  actions: [
    TextButton(
      onPressed: () {},
      child: Text("Dismiss"),
    ),
  ],
)

メッセージを表示するためのボックス。

このウィジェットは、左側にアイコン、中央にメッセージコンテンツ、右側にオプションの アクションボタンを持つスタイル付きメッセージコンテナを作成します。 アラート、通知、情報ボックス、警告、エラーメッセージに最適です。

特徴:

  • アイコン + メッセージ + アクションのレイアウト
  • カスタマイズ可能な色（メインカラーと背景）
  • 未指定時のデフォルトアイコン（Icons.info_outline）
  • 自動背景色（メインカラーの10%不透明度）
  • オプションのアクションボタン
  • カスタマイズ可能なボーダーと角丸
  • 調整可能なパディングとマージン

例:

MessageBox(
  label: Text("これは重要なメッセージです"),
  icon: Icon(Icons.warning),
  color: Colors.orange,
  actions: [
    TextButton(
      onPressed: () {},
      child: Text("閉じる"),
    ),
  ],
)
Inheritance

Constructors

MessageBox({required Widget label, Key? key, Widget? icon, Widget? title, TextStyle? textStyle, Color? backgroundColor, BoxBorder? border, BorderRadiusGeometry? borderRadius, EdgeInsetsGeometry padding = const EdgeInsets.all(16), Color? color, EdgeInsetsGeometry? margin, List<Widget> actions = const []})
An informational message box widget with icon, label, and optional actions.
const

Properties

actions → List<Widget>
List of message box actions.
final
backgroundColor → Color?
Background color.
final
border → BoxBorder?
Box borders.
final
borderRadius → BorderRadiusGeometry?
Box rounded corners.
final
color → Color?
Main color.
final
hashCode → int
The hash code for this object.
no setterinherited
icon → Widget?
A widget that can be placed in the icon section.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
label → Widget
A widget that can be placed in the message section.
final
margin → EdgeInsetsGeometry?
Content Mergin.
final
padding → EdgeInsetsGeometry
Content Padding.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
textStyle → TextStyle?
Message text style.
final
title → Widget?
A widget that can be placed in the title section.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited