636 lines
22 KiB
Dart
636 lines
22 KiB
Dart
import 'dart:async';
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import 'dart:ui';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter/material.dart';
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// Examples can assume:
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// enum Department { treasury, state }
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/// A material design dialog.
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///
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/// This dialog widget does not have any opinion about the contents of the
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/// dialog. Rather than using this widget directly, consider using [AlertDialog]
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/// or [SimpleDialog], which implement specific kinds of material design
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/// dialogs.
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///
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/// See also:
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///
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/// * [AlertDialog], for dialogs that have a message and some buttons.
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/// * [SimpleDialog], for dialogs that offer a variety of options.
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/// * [showDialog], which actually displays the dialog and returns its result.
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/// * <https://material.google.com/components/dialogs.html>
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class Dialog extends StatelessWidget {
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/// Creates a dialog.
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///
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/// Typically used in conjunction with [showDialog].
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const Dialog({
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Key key,
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this.child,
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this.insetAnimationDuration: const Duration(milliseconds: 100),
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this.insetAnimationCurve: Curves.decelerate,
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}) : super(key: key);
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/// The widget below this widget in the tree.
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///
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/// {@macro flutter.widgets.child}
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final Widget child;
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/// The duration of the animation to show when the system keyboard intrudes
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/// into the space that the dialog is placed in.
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///
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/// Defaults to 100 milliseconds.
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final Duration insetAnimationDuration;
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/// The curve to use for the animation shown when the system keyboard intrudes
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/// into the space that the dialog is placed in.
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///
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/// Defaults to [Curves.fastOutSlowIn].
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final Curve insetAnimationCurve;
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Color _getColor(BuildContext context) {
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return Theme.of(context).dialogBackgroundColor;
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}
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@override
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Widget build(BuildContext context) {
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return new AnimatedPadding(
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padding: MediaQuery.of(context).viewInsets +
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const EdgeInsets.symmetric(horizontal: 40.0, vertical: 24.0),
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duration: insetAnimationDuration,
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curve: insetAnimationCurve,
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child: new MediaQuery.removeViewInsets(
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removeLeft: true,
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removeTop: true,
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removeRight: true,
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removeBottom: true,
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context: context,
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child: new Center(
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child: new ConstrainedBox(
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constraints: const BoxConstraints(minWidth: 280.0),
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child: new Material(
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(10.0)), side: BorderSide(color: Colors.white, width: 1.0, style: BorderStyle.solid)),
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elevation: 30.0,
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color: _getColor(context),
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type: MaterialType.card,
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child: child,
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),
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),
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),
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),
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);
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}
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}
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/// A material design alert dialog.
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///
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/// An alert dialog informs the user about situations that require
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/// acknowledgement. An alert dialog has an optional title and an optional list
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/// of actions. The title is displayed above the content and the actions are
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/// displayed below the content.
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///
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/// If the content is too large to fit on the screen vertically, the dialog will
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/// display the title and the actions and let the content overflow. Consider
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/// using a scrolling widget, such as [ListView], for [content] to avoid
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/// overflow.
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///
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/// For dialogs that offer the user a choice between several options, consider
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/// using a [SimpleDialog].
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///
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/// Typically passed as the child widget to [showDialog], which displays the
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/// dialog.
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///
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/// ## Sample code
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///
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/// This snippet shows a method in a [State] which, when called, displays a dialog box
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/// and returns a [Future] that completes when the dialog is dismissed.
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///
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/// ```dart
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/// Future<Null> _neverSatisfied() async {
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/// return showDialog<Null>(
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/// context: context,
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/// barrierDismissible: false, // user must tap button!
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/// builder: (BuildContext context) {
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/// return new AlertDialog(
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/// title: new Text('Rewind and remember'),
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/// content: new SingleChildScrollView(
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/// child: new ListBody(
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/// children: <Widget>[
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/// new Text('You will never be satisfied.'),
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/// new Text('You\’re like me. I’m never satisfied.'),
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/// ],
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/// ),
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/// ),
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/// actions: <Widget>[
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/// new FlatButton(
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/// child: new Text('Regret'),
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/// onPressed: () {
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/// Navigator.of(context).pop();
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/// },
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/// ),
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/// ],
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/// );
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/// },
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/// );
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/// }
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/// ```
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///
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/// See also:
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///
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/// * [SimpleDialog], which handles the scrolling of the contents but has no [actions].
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/// * [Dialog], on which [AlertDialog] and [SimpleDialog] are based.
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/// * [showDialog], which actually displays the dialog and returns its result.
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/// * <https://material.google.com/components/dialogs.html#dialogs-alerts>
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class CustomAlertDialog extends StatelessWidget {
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/// Creates an alert dialog.
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///
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/// Typically used in conjunction with [showDialog].
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///
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/// The [contentPadding] must not be null. The [titlePadding] defaults to
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/// null, which implies a default that depends on the values of the other
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/// properties. See the documentation of [titlePadding] for details.
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const CustomAlertDialog({
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Key key,
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this.title,
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this.titlePadding,
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this.content,
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this.contentPadding: const EdgeInsets.fromLTRB(24.0, 20.0, 24.0, 24.0),
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this.actions,
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this.semanticLabel,
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}) : assert(contentPadding != null),
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super(key: key);
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/// The (optional) title of the dialog is displayed in a large font at the top
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/// of the dialog.
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///
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/// Typically a [Text] widget.
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final Widget title;
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/// Padding around the title.
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///
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/// If there is no title, no padding will be provided. Otherwise, this padding
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/// is used.
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///
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/// This property defaults to providing 24 pixels on the top, left, and right
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/// of the title. If the [content] is not null, then no bottom padding is
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/// provided (but see [contentPadding]). If it _is_ null, then an extra 20
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/// pixels of bottom padding is added to separate the [title] from the
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/// [actions].
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final EdgeInsetsGeometry titlePadding;
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/// The (optional) content of the dialog is displayed in the center of the
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/// dialog in a lighter font.
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///
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/// Typically, this is a [ListView] containing the contents of the dialog.
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/// Using a [ListView] ensures that the contents can scroll if they are too
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/// big to fit on the display.
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final Widget content;
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/// Padding around the content.
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///
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/// If there is no content, no padding will be provided. Otherwise, padding of
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/// 20 pixels is provided above the content to separate the content from the
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/// title, and padding of 24 pixels is provided on the left, right, and bottom
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/// to separate the content from the other edges of the dialog.
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final EdgeInsetsGeometry contentPadding;
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/// The (optional) set of actions that are displayed at the bottom of the
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/// dialog.
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///
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/// Typically this is a list of [FlatButton] widgets.
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///
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/// These widgets will be wrapped in a [ButtonBar], which introduces 8 pixels
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/// of padding on each side.
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///
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/// If the [title] is not null but the [content] _is_ null, then an extra 20
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/// pixels of padding is added above the [ButtonBar] to separate the [title]
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/// from the [actions].
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final List<Widget> actions;
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/// The semantic label of the dialog used by accessibility frameworks to
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/// announce screen transitions when the dialog is opened and closed.
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///
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/// If this label is not provided, a semantic label will be infered from the
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/// [title] if it is not null. If there is no title, the label will be taken
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/// from [MaterialLocalizations.alertDialogLabel].
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///
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/// See also:
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///
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/// * [SemanticsConfiguration.isRouteName], for a description of how this
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/// value is used.
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final String semanticLabel;
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@override
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Widget build(BuildContext context) {
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final List<Widget> children = <Widget>[];
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String label = semanticLabel;
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if (title != null) {
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children.add(new Padding(
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padding: titlePadding ??
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new EdgeInsets.fromLTRB(
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24.0, 24.0, 24.0, content == null ? 20.0 : 0.0),
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child: new DefaultTextStyle(
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style: Theme.of(context).textTheme.title,
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child: new Semantics(child: title, namesRoute: true),
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),
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));
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} else {
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switch (defaultTargetPlatform) {
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case TargetPlatform.iOS:
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label = semanticLabel;
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break;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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label = semanticLabel ??
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MaterialLocalizations.of(context)?.alertDialogLabel;
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}
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}
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if (content != null) {
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children.add(new Flexible(
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child: new Padding(
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padding: contentPadding,
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child: new DefaultTextStyle(
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style: Theme.of(context).textTheme.subhead,
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child: content,
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),
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),
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));
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}
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if (actions != null) {
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children.add(new ButtonTheme.bar(
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child: new ButtonBar(
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children: actions,
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),
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));
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}
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Widget dialogChild = new IntrinsicWidth(
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child: new Column(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: children,
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),
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);
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if (label != null)
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dialogChild =
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new Semantics(namesRoute: true, label: label, child: dialogChild);
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return new Dialog(child: dialogChild);
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}
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}
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/// An option used in a [SimpleDialog].
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///
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/// A simple dialog offers the user a choice between several options. This
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/// widget is commonly used to represent each of the options. If the user
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/// selects this option, the widget will call the [onPressed] callback, which
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/// typically uses [Navigator.pop] to close the dialog.
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///
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/// The padding on a [SimpleDialogOption] is configured to combine with the
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/// default [SimpleDialog.contentPadding] so that each option ends up 8 pixels
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/// from the other vertically, with 20 pixels of spacing between the dialog's
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/// title and the first option, and 24 pixels of spacing between the last option
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/// and the bottom of the dialog.
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///
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/// ## Sample code
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///
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/// ```dart
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/// new SimpleDialogOption(
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/// onPressed: () { Navigator.pop(context, Department.treasury); },
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/// child: const Text('Treasury department'),
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/// )
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/// ```
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///
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/// See also:
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///
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/// * [SimpleDialog], for a dialog in which to use this widget.
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/// * [showDialog], which actually displays the dialog and returns its result.
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/// * [FlatButton], which are commonly used as actions in other kinds of
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/// dialogs, such as [AlertDialog]s.
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/// * <https://material.google.com/components/dialogs.html#dialogs-simple-dialogs>
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class SimpleDialogOption extends StatelessWidget {
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/// Creates an option for a [SimpleDialog].
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const SimpleDialogOption({
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Key key,
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this.onPressed,
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this.child,
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}) : super(key: key);
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/// The callback that is called when this option is selected.
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///
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/// If this is set to null, the option cannot be selected.
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///
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/// When used in a [SimpleDialog], this will typically call [Navigator.pop]
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/// with a value for [showDialog] to complete its future with.
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final VoidCallback onPressed;
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/// The widget below this widget in the tree.
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///
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/// Typically a [Text] widget.
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final Widget child;
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@override
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Widget build(BuildContext context) {
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return new InkWell(
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onTap: onPressed,
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child: new Padding(
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padding: const EdgeInsets.symmetric(vertical: 8.0, horizontal: 24.0),
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child: child),
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);
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}
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}
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/// A simple material design dialog.
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///
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/// A simple dialog offers the user a choice between several options. A simple
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/// dialog has an optional title that is displayed above the choices.
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///
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/// Choices are normally represented using [SimpleDialogOption] widgets. If
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/// other widgets are used, see [contentPadding] for notes regarding the
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/// conventions for obtaining the spacing expected by Material Design.
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///
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/// For dialogs that inform the user about a situation, consider using an
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/// [AlertDialog].
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///
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/// Typically passed as the child widget to [showDialog], which displays the
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/// dialog.
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///
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/// ## Sample code
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///
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/// In this example, the user is asked to select between two options. These
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/// options are represented as an enum. The [showDialog] method here returns
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/// a [Future] that completes to a value of that enum. If the user cancels
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/// the dialog (e.g. by hitting the back button on Android, or tapping on the
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/// mask behind the dialog) then the future completes with the null value.
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///
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/// The return value in this example is used as the index for a switch statement.
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/// One advantage of using an enum as the return value and then using that to
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/// drive a switch statement is that the analyzer will flag any switch statement
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/// that doesn't mention every value in the enum.
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///
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/// ```dart
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/// Future<Null> _askedToLead() async {
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/// switch (await showDialog<Department>(
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/// context: context,
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/// builder: (BuildContext context) {
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/// return new SimpleDialog(
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/// title: const Text('Select assignment'),
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/// children: <Widget>[
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/// new SimpleDialogOption(
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/// onPressed: () { Navigator.pop(context, Department.treasury); },
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/// child: const Text('Treasury department'),
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/// ),
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/// new SimpleDialogOption(
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/// onPressed: () { Navigator.pop(context, Department.state); },
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/// child: const Text('State department'),
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/// ),
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/// ],
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/// );
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/// }
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/// )) {
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/// case Department.treasury:
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/// // Let's go.
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/// // ...
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/// break;
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/// case Department.state:
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/// // ...
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/// break;
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/// }
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/// }
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/// ```
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///
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/// See also:
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///
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/// * [SimpleDialogOption], which are options used in this type of dialog.
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/// * [AlertDialog], for dialogs that have a row of buttons below the body.
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/// * [Dialog], on which [SimpleDialog] and [AlertDialog] are based.
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/// * [showDialog], which actually displays the dialog and returns its result.
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/// * <https://material.google.com/components/dialogs.html#dialogs-simple-dialogs>
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class SimpleDialog extends StatelessWidget {
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/// Creates a simple dialog.
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///
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/// Typically used in conjunction with [showDialog].
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///
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/// The [titlePadding] and [contentPadding] arguments must not be null.
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const SimpleDialog({
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Key key,
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this.title,
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this.titlePadding: const EdgeInsets.fromLTRB(24.0, 24.0, 24.0, 0.0),
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this.children,
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this.contentPadding: const EdgeInsets.fromLTRB(0.0, 12.0, 0.0, 16.0),
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this.semanticLabel,
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}) : assert(titlePadding != null),
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assert(contentPadding != null),
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super(key: key);
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/// The (optional) title of the dialog is displayed in a large font at the top
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/// of the dialog.
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///
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/// Typically a [Text] widget.
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final Widget title;
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/// Padding around the title.
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///
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/// If there is no title, no padding will be provided.
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///
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/// By default, this provides the recommend Material Design padding of 24
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/// pixels around the left, top, and right edges of the title.
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///
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/// See [contentPadding] for the conventions regarding padding between the
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/// [title] and the [children].
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final EdgeInsetsGeometry titlePadding;
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/// The (optional) content of the dialog is displayed in a
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/// [SingleChildScrollView] underneath the title.
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///
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/// Typically a list of [SimpleDialogOption]s.
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final List<Widget> children;
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/// Padding around the content.
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///
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/// By default, this is 12 pixels on the top and 16 pixels on the bottom. This
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/// is intended to be combined with children that have 24 pixels of padding on
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/// the left and right, and 8 pixels of padding on the top and bottom, so that
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/// the content ends up being indented 20 pixels from the title, 24 pixels
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/// from the bottom, and 24 pixels from the sides.
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///
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/// The [SimpleDialogOption] widget uses such padding.
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///
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/// If there is no [title], the [contentPadding] should be adjusted so that
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/// the top padding ends up being 24 pixels.
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final EdgeInsetsGeometry contentPadding;
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/// The semantic label of the dialog used by accessibility frameworks to
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/// announce screen transitions when the dialog is opened and closed.
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///
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/// If this label is not provided, a semantic label will be infered from the
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/// [title] if it is not null. If there is no title, the label will be taken
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/// from [MaterialLocalizations.dialogLabel].
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///
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/// See also:
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///
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/// * [SemanticsConfiguration.isRouteName], for a description of how this
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/// value is used.
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final String semanticLabel;
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@override
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Widget build(BuildContext context) {
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final List<Widget> body = <Widget>[];
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String label = semanticLabel;
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if (title != null) {
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body.add(new Padding(
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padding: titlePadding,
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child: new DefaultTextStyle(
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style: Theme.of(context).textTheme.title,
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child: new Semantics(namesRoute: true, child: title),
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)));
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} else {
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switch (defaultTargetPlatform) {
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case TargetPlatform.iOS:
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label = semanticLabel;
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break;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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label =
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semanticLabel ?? MaterialLocalizations.of(context)?.dialogLabel;
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}
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}
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if (children != null) {
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body.add(new Flexible(
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child: new SingleChildScrollView(
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padding: contentPadding,
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child: new ListBody(children: children),
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)));
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}
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Widget dialogChild = new IntrinsicWidth(
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stepWidth: 56.0,
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child: new ConstrainedBox(
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constraints: const BoxConstraints(minWidth: 280.0),
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child: new Column(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: body,
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),
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),
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);
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if (label != null)
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dialogChild = new Semantics(
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namesRoute: true,
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label: label,
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child: dialogChild,
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);
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return new Dialog(child: dialogChild);
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}
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}
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class _DialogRoute<T> extends PopupRoute<T> {
|
||
_DialogRoute({
|
||
@required this.theme,
|
||
bool barrierDismissible: true,
|
||
this.barrierLabel,
|
||
@required this.child,
|
||
RouteSettings settings,
|
||
}) : assert(barrierDismissible != null),
|
||
_barrierDismissible = barrierDismissible,
|
||
super(settings: settings);
|
||
|
||
final Widget child;
|
||
final ThemeData theme;
|
||
|
||
@override
|
||
Duration get transitionDuration => const Duration(milliseconds: 150);
|
||
|
||
@override
|
||
bool get barrierDismissible => _barrierDismissible;
|
||
final bool _barrierDismissible;
|
||
|
||
@override
|
||
Color get barrierColor => Colors.black54;
|
||
|
||
@override
|
||
final String barrierLabel;
|
||
|
||
@override
|
||
Widget buildPage(BuildContext context, Animation<double> animation,
|
||
Animation<double> secondaryAnimation) {
|
||
return new SafeArea(
|
||
child: new Builder(builder: (BuildContext context) {
|
||
final Widget annotatedChild = new Semantics(
|
||
child: child,
|
||
scopesRoute: true,
|
||
explicitChildNodes: true,
|
||
);
|
||
return theme != null
|
||
? new Theme(data: theme, child: annotatedChild)
|
||
: annotatedChild;
|
||
}),
|
||
);
|
||
}
|
||
|
||
@override
|
||
Widget buildTransitions(BuildContext context, Animation<double> animation,
|
||
Animation<double> secondaryAnimation, Widget child) {
|
||
return new FadeTransition(
|
||
opacity: new CurvedAnimation(parent: animation, curve: Curves.easeOut),
|
||
child: child);
|
||
}
|
||
}
|
||
|
||
/// Displays a dialog above the current contents of the app.
|
||
///
|
||
/// This function takes a `builder` which typically builds a [Dialog] widget.
|
||
/// Content below the dialog is dimmed with a [ModalBarrier]. This widget does
|
||
/// not share a context with the location that `showDialog` is originally
|
||
/// called from. Use a [StatefulBuilder] or a custom [StatefulWidget] if the
|
||
/// dialog needs to update dynamically.
|
||
///
|
||
/// The `context` argument is used to look up the [Navigator] and [Theme] for
|
||
/// the dialog. It is only used when the method is called. Its corresponding
|
||
/// widget can be safely removed from the tree before the dialog is closed.
|
||
///
|
||
/// The `child` argument is deprecated, and should be replaced with `builder`.
|
||
///
|
||
/// Returns a [Future] that resolves to the value (if any) that was passed to
|
||
/// [Navigator.pop] when the dialog was closed.
|
||
///
|
||
/// The dialog route created by this method is pushed to the root navigator.
|
||
/// If the application has multiple [Navigator] objects, it may be necessary to
|
||
/// call `Navigator.of(context, rootNavigator: true).pop(result)` to close the
|
||
/// dialog rather just 'Navigator.pop(context, result)`.
|
||
///
|
||
/// See also:
|
||
/// * [AlertDialog], for dialogs that have a row of buttons below a body.
|
||
/// * [SimpleDialog], which handles the scrolling of the contents and does
|
||
/// not show buttons below its body.
|
||
/// * [Dialog], on which [SimpleDialog] and [AlertDialog] are based.
|
||
/// * <https://material.google.com/components/dialogs.html>
|
||
Future<T> customShowDialog<T>({
|
||
@required
|
||
BuildContext context,
|
||
bool barrierDismissible: true,
|
||
@Deprecated(
|
||
'Instead of using the "child" argument, return the child from a closure '
|
||
'provided to the "builder" argument. This will ensure that the BuildContext '
|
||
'is appropriate for widgets built in the dialog.')
|
||
Widget child,
|
||
WidgetBuilder builder,
|
||
}) {
|
||
assert(child == null || builder == null);
|
||
return Navigator.of(context, rootNavigator: true).push(new _DialogRoute<T>(
|
||
child: child ?? new Builder(builder: builder),
|
||
theme: Theme.of(context, shadowThemeOnly: true),
|
||
barrierDismissible: barrierDismissible,
|
||
barrierLabel:
|
||
MaterialLocalizations.of(context).modalBarrierDismissLabel,
|
||
));
|
||
} |