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flutter / mirrors / flutter / 26af12ed9f5c26dec418f40bc7b9229977967656 / . / packages / flutter / lib / src / cupertino / dialog.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:math' as math;
import 'dart:ui' show ImageFilter;
import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'colors.dart';
import 'interface_level.dart';
import 'localizations.dart';
import 'scrollbar.dart';
import 'theme.dart';
// TODO(abarth): These constants probably belong somewhere more general.
// Used XD to flutter plugin(https://github.com/AdobeXD/xd-to-flutter-plugin/)
// to derive values of TextStyle(height and letterSpacing) from
// Adobe XD template for iOS 13, which can be found in
// Apple Design Resources(https://developer.apple.com/design/resources/).
// However the values are not exactly the same as native, so eyeballing is needed.
const TextStyle _kCupertinoDialogTitleStyle = TextStyle(
fontFamily: '.SF UI Display',
inherit: false,
fontSize: 17.0,
fontWeight: FontWeight.w600,
height: 1.3,
letterSpacing: -0.5,
textBaseline: TextBaseline.alphabetic,
);
const TextStyle _kCupertinoDialogContentStyle = TextStyle(
fontFamily: '.SF UI Text',
inherit: false,
fontSize: 13.0,
fontWeight: FontWeight.w400,
height: 1.35,
letterSpacing: -0.2,
textBaseline: TextBaseline.alphabetic,
);
const TextStyle _kCupertinoDialogActionStyle = TextStyle(
fontFamily: '.SF UI Text',
inherit: false,
fontSize: 16.8,
fontWeight: FontWeight.w400,
textBaseline: TextBaseline.alphabetic,
);
// CupertinoActionSheet-specific text styles.
const TextStyle _kActionSheetActionStyle = TextStyle(
fontFamily: '.SF UI Text',
inherit: false,
fontSize: 20.0,
fontWeight: FontWeight.w400,
textBaseline: TextBaseline.alphabetic,
);
const TextStyle _kActionSheetContentStyle = TextStyle(
fontFamily: '.SF UI Text',
inherit: false,
fontSize: 13.0,
fontWeight: FontWeight.w400,
color: _kActionSheetContentTextColor,
textBaseline: TextBaseline.alphabetic,
);
// Generic constants shared between Dialog and ActionSheet.
const double _kBlurAmount = 20.0;
const double _kCornerRadius = 14.0;
const double _kDividerThickness = 1.0;
// Dialog specific constants.
// iOS dialogs have a normal display width and another display width that is
// used when the device is in accessibility mode. Each of these widths are
// listed below.
const double _kCupertinoDialogWidth = 270.0;
const double _kAccessibilityCupertinoDialogWidth = 310.0;
const double _kDialogEdgePadding = 20.0;
const double _kDialogMinButtonHeight = 45.0;
const double _kDialogMinButtonFontSize = 10.0;
// ActionSheet specific constants.
const double _kActionSheetEdgeHorizontalPadding = 8.0;
const double _kActionSheetCancelButtonPadding = 8.0;
const double _kActionSheetEdgeVerticalPadding = 10.0;
const double _kActionSheetContentHorizontalPadding = 40.0;
const double _kActionSheetContentVerticalPadding = 14.0;
const double _kActionSheetButtonHeight = 56.0;
// A translucent color that is painted on top of the blurred backdrop as the
// dialog's background color
// Extracted from https://developer.apple.com/design/resources/.
const Color _kDialogColor = CupertinoDynamicColor.withBrightness(
color: Color(0xCCF2F2F2),
darkColor: Color(0xBF1E1E1E),
);
// Translucent light gray that is painted on top of the blurred backdrop as the
// background color of a pressed button.
// Eyeballed from iOS 13 beta simulator.
const Color _kPressedColor = CupertinoDynamicColor.withBrightness(
color: Color(0xFFE1E1E1),
darkColor: Color(0xFF2E2E2E),
);
const Color _kActionSheetCancelPressedColor = CupertinoDynamicColor.withBrightness(
color: Color(0xFFECECEC),
darkColor: Color(0xFF49494B),
);
// Translucent, very light gray that is painted on top of the blurred backdrop
// as the action sheet's background color.
// TODO(LongCatIsLooong): https://github.com/flutter/flutter/issues/39272. Use
// System Materials once we have them.
// Extracted from https://developer.apple.com/design/resources/.
const Color _kActionSheetBackgroundColor = CupertinoDynamicColor.withBrightness(
color: Color(0xC7F9F9F9),
darkColor: Color(0xC7252525),
);
// The gray color used for text that appears in the title area.
// Extracted from https://developer.apple.com/design/resources/.
const Color _kActionSheetContentTextColor = Color(0xFF8F8F8F);
// Translucent gray that is painted on top of the blurred backdrop in the gap
// areas between the content section and actions section, as well as between
// buttons.
// Eye-balled from iOS 13 beta simulator.
const Color _kActionSheetButtonDividerColor = _kActionSheetContentTextColor;
// The alert dialog layout policy changes depending on whether the user is using
// a "regular" font size vs a "large" font size. This is a spectrum. There are
// many "regular" font sizes and many "large" font sizes. But depending on which
// policy is currently being used, a dialog is laid out differently.
//
// Empirically, the jump from one policy to the other occurs at the following text
// scale factors:
// Largest regular scale factor: 1.3529411764705883
// Smallest large scale factor: 1.6470588235294117
//
// The following constant represents a division in text scale factor beyond which
// we want to change how the dialog is laid out.
const double _kMaxRegularTextScaleFactor = 1.4;
// Accessibility mode on iOS is determined by the text scale factor that the
// user has selected.
bool _isInAccessibilityMode(BuildContext context) {
final MediaQueryData? data = MediaQuery.maybeOf(context);
return data != null && data.textScaleFactor > _kMaxRegularTextScaleFactor;
}
/// An iOS-style alert dialog.
///
/// {@youtube 560 315 https://www.youtube.com/watch?v=75CsnyRXf5I}
///
/// An alert dialog informs the user about situations that require
/// acknowledgment. An alert dialog has an optional title, optional content,
/// and an optional list of actions. The title is displayed above the content
/// and the actions are displayed below the content.
///
/// This dialog styles its title and content (typically a message) to match the
/// standard iOS title and message dialog text style. These default styles can
/// be overridden by explicitly defining [TextStyle]s for [Text] widgets that
/// are part of the title or content.
///
/// To display action buttons that look like standard iOS dialog buttons,
/// provide [CupertinoDialogAction]s for the [actions] given to this dialog.
///
/// Typically passed as the child widget to [showDialog], which displays the
/// dialog.
///
/// {@tool dartpad}
/// This sample shows how to use a [CupertinoAlertDialog].
/// The [CupertinoAlertDialog] shows an alert with a set of two choices
/// when [CupertinoButton] is pressed.
///
/// ** See code in examples/api/lib/cupertino/dialog/cupertino_alert_dialog.0.dart **
/// {@end-tool}
///
/// See also:
///
/// * [CupertinoPopupSurface], which is a generic iOS-style popup surface that
/// holds arbitrary content to create custom popups.
/// * [CupertinoDialogAction], which is an iOS-style dialog button.
/// * [AlertDialog], a Material Design alert dialog.
/// * <https://developer.apple.com/ios/human-interface-guidelines/views/alerts/>
class CupertinoAlertDialog extends StatelessWidget {
/// Creates an iOS-style alert dialog.
///
/// The [actions] must not be null.
const CupertinoAlertDialog({
super.key,
this.title,
this.content,
this.actions = const <Widget>[],
this.scrollController,
this.actionScrollController,
this.insetAnimationDuration = const Duration(milliseconds: 100),
this.insetAnimationCurve = Curves.decelerate,
}) : assert(actions != null);
/// The (optional) title of the dialog is displayed in a large font at the top
/// of the dialog.
///
/// Typically a [Text] widget.
final Widget? title;
/// The (optional) content of the dialog is displayed in the center of the
/// dialog in a lighter font.
///
/// Typically a [Text] widget.
final Widget? content;
/// The (optional) set of actions that are displayed at the bottom of the
/// dialog.
///
/// Typically this is a list of [CupertinoDialogAction] widgets.
final List<Widget> actions;
/// A scroll controller that can be used to control the scrolling of the
/// [content] in the dialog.
///
/// Defaults to null, and is typically not needed, since most alert messages
/// are short.
///
/// See also:
///
/// * [actionScrollController], which can be used for controlling the actions
/// section when there are many actions.
final ScrollController? scrollController;
ScrollController get _effectiveScrollController =>
scrollController ?? ScrollController();
/// A scroll controller that can be used to control the scrolling of the
/// actions in the dialog.
///
/// Defaults to null, and is typically not needed.
///
/// See also:
///
/// * [scrollController], which can be used for controlling the [content]
/// section when it is long.
final ScrollController? actionScrollController;
ScrollController get _effectiveActionScrollController =>
actionScrollController ?? ScrollController();
/// {@macro flutter.material.dialog.insetAnimationDuration}
final Duration insetAnimationDuration;
/// {@macro flutter.material.dialog.insetAnimationCurve}
final Curve insetAnimationCurve;
Widget _buildContent(BuildContext context) {
final double textScaleFactor = MediaQuery.of(context).textScaleFactor;
final List<Widget> children = <Widget>[
if (title != null || content != null)
Flexible(
flex: 3,
child: _CupertinoAlertContentSection(
title: title,
message: content,
scrollController: _effectiveScrollController,
titlePadding: EdgeInsets.only(
left: _kDialogEdgePadding,
right: _kDialogEdgePadding,
bottom: content == null ? _kDialogEdgePadding : 1.0,
top: _kDialogEdgePadding * textScaleFactor,
),
messagePadding: EdgeInsets.only(
left: _kDialogEdgePadding,
right: _kDialogEdgePadding,
bottom: _kDialogEdgePadding * textScaleFactor,
top: title == null ? _kDialogEdgePadding : 1.0,
),
titleTextStyle: _kCupertinoDialogTitleStyle.copyWith(
color: CupertinoDynamicColor.resolve(CupertinoColors.label, context),
),
messageTextStyle: _kCupertinoDialogContentStyle.copyWith(
color: CupertinoDynamicColor.resolve(CupertinoColors.label, context),
),
),
),
];
return Container(
color: CupertinoDynamicColor.resolve(_kDialogColor, context),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: children,
),
);
}
Widget _buildActions() {
Widget actionSection = Container(
height: 0.0,
);
if (actions.isNotEmpty) {
actionSection = _CupertinoAlertActionSection(
scrollController: _effectiveActionScrollController,
children: actions,
);
}
return actionSection;
}
@override
Widget build(BuildContext context) {
final CupertinoLocalizations localizations = CupertinoLocalizations.of(context);
final bool isInAccessibilityMode = _isInAccessibilityMode(context);
final double textScaleFactor = MediaQuery.of(context).textScaleFactor;
return CupertinoUserInterfaceLevel(
data: CupertinoUserInterfaceLevelData.elevated,
child: MediaQuery(
data: MediaQuery.of(context).copyWith(
// iOS does not shrink dialog content below a 1.0 scale factor
textScaleFactor: math.max(textScaleFactor, 1.0),
),
child: ScrollConfiguration(
// A CupertinoScrollbar is built-in below.
behavior: ScrollConfiguration.of(context).copyWith(scrollbars: false),
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return AnimatedPadding(
padding: MediaQuery.of(context).viewInsets +
const EdgeInsets.symmetric(horizontal: 40.0, vertical: 24.0),
duration: insetAnimationDuration,
curve: insetAnimationCurve,
child: MediaQuery.removeViewInsets(
removeLeft: true,
removeTop: true,
removeRight: true,
removeBottom: true,
context: context,
child: Center(
child: Container(
margin: const EdgeInsets.symmetric(vertical: _kDialogEdgePadding),
width: isInAccessibilityMode
? _kAccessibilityCupertinoDialogWidth
: _kCupertinoDialogWidth,
child: CupertinoPopupSurface(
isSurfacePainted: false,
child: Semantics(
namesRoute: true,
scopesRoute: true,
explicitChildNodes: true,
label: localizations.alertDialogLabel,
child: _CupertinoDialogRenderWidget(
contentSection: _buildContent(context),
actionsSection: _buildActions(),
dividerColor: CupertinoColors.separator,
),
),
),
),
),
),
);
},
),
),
),
);
}
}
/// Rounded rectangle surface that looks like an iOS popup surface, e.g., alert dialog
/// and action sheet.
///
/// A [CupertinoPopupSurface] can be configured to paint or not paint a white
/// color on top of its blurred area. Typical usage should paint white on top
/// of the blur. However, the white paint can be disabled for the purpose of
/// rendering divider gaps for a more complicated layout, e.g., [CupertinoAlertDialog].
/// Additionally, the white paint can be disabled to render a blurred rounded
/// rectangle without any color (similar to iOS's volume control popup).
///
/// See also:
///
/// * [CupertinoAlertDialog], which is a dialog with a title, content, and
/// actions.
/// * <https://developer.apple.com/ios/human-interface-guidelines/views/alerts/>
class CupertinoPopupSurface extends StatelessWidget {
/// Creates an iOS-style rounded rectangle popup surface.
const CupertinoPopupSurface({
super.key,
this.isSurfacePainted = true,
this.child,
});
/// Whether or not to paint a translucent white on top of this surface's
/// blurred background. [isSurfacePainted] should be true for a typical popup
/// that contains content without any dividers. A popup that requires dividers
/// should set [isSurfacePainted] to false and then paint its own surface area.
///
/// Some popups, like iOS's volume control popup, choose to render a blurred
/// area without any white paint covering it. To achieve this effect,
/// [isSurfacePainted] should be set to false.
final bool isSurfacePainted;
/// The widget below this widget in the tree.
final Widget? child;
@override
Widget build(BuildContext context) {
return ClipRRect(
borderRadius: const BorderRadius.all(Radius.circular(_kCornerRadius)),
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: _kBlurAmount, sigmaY: _kBlurAmount),
child: Container(
color: isSurfacePainted ? CupertinoDynamicColor.resolve(_kDialogColor, context) : null,
child: child,
),
),
);
}
}
/// An iOS-style action sheet.
///
/// {@youtube 560 315 https://www.youtube.com/watch?v=U-ao8p4A82k}
///
/// An action sheet is a specific style of alert that presents the user
/// with a set of two or more choices related to the current context.
/// An action sheet can have a title, an additional message, and a list
/// of actions. The title is displayed above the message and the actions
/// are displayed below this content.
///
/// This action sheet styles its title and message to match standard iOS action
/// sheet title and message text style.
///
/// To display action buttons that look like standard iOS action sheet buttons,
/// provide [CupertinoActionSheetAction]s for the [actions] given to this action
/// sheet.
///
/// To include a iOS-style cancel button separate from the other buttons,
/// provide an [CupertinoActionSheetAction] for the [cancelButton] given to this
/// action sheet.
///
/// An action sheet is typically passed as the child widget to
/// [showCupertinoModalPopup], which displays the action sheet by sliding it up
/// from the bottom of the screen.
///
/// {@tool dartpad}
/// This sample shows how to use a [CupertinoActionSheet].
/// The [CupertinoActionSheet] shows a modal popup that slides in from the
/// bottom when [CupertinoButton] is pressed.
///
/// ** See code in examples/api/lib/cupertino/dialog/cupertino_action_sheet.0.dart **
/// {@end-tool}
///
/// See also:
///
/// * [CupertinoActionSheetAction], which is an iOS-style action sheet button.
/// * <https://developer.apple.com/design/human-interface-guidelines/ios/views/action-sheets/>
class CupertinoActionSheet extends StatelessWidget {
/// Creates an iOS-style action sheet.
///
/// An action sheet must have a non-null value for at least one of the
/// following arguments: [actions], [title], [message], or [cancelButton].
///
/// Generally, action sheets are used to give the user a choice between
/// two or more choices for the current context.
const CupertinoActionSheet({
super.key,
this.title,
this.message,
this.actions,
this.messageScrollController,
this.actionScrollController,
this.cancelButton,
}) : assert(
actions != null || title != null || message != null || cancelButton != null,
'An action sheet must have a non-null value for at least one of the following arguments: '
'actions, title, message, or cancelButton',
);
/// An optional title of the action sheet. When the [message] is non-null,
/// the font of the [title] is bold.
///
/// Typically a [Text] widget.
final Widget? title;
/// An optional descriptive message that provides more details about the
/// reason for the alert.
///
/// Typically a [Text] widget.
final Widget? message;
/// The set of actions that are displayed for the user to select.
///
/// Typically this is a list of [CupertinoActionSheetAction] widgets.
final List<Widget>? actions;
/// A scroll controller that can be used to control the scrolling of the
/// [message] in the action sheet.
///
/// This attribute is typically not needed, as alert messages should be
/// short.
final ScrollController? messageScrollController;
ScrollController get _effectiveMessageScrollController =>
messageScrollController ?? ScrollController();
/// A scroll controller that can be used to control the scrolling of the
/// [actions] in the action sheet.
///
/// This attribute is typically not needed.
final ScrollController? actionScrollController;
ScrollController get _effectiveActionScrollController =>
actionScrollController ?? ScrollController();
/// The optional cancel button that is grouped separately from the other
/// actions.
///
/// Typically this is an [CupertinoActionSheetAction] widget.
final Widget? cancelButton;
Widget _buildContent(BuildContext context) {
final List<Widget> content = <Widget>[];
if (title != null || message != null) {
final Widget titleSection = _CupertinoAlertContentSection(
title: title,
message: message,
scrollController: _effectiveMessageScrollController,
titlePadding: const EdgeInsets.only(
left: _kActionSheetContentHorizontalPadding,
right: _kActionSheetContentHorizontalPadding,
bottom: _kActionSheetContentVerticalPadding,
top: _kActionSheetContentVerticalPadding,
),
messagePadding: EdgeInsets.only(
left: _kActionSheetContentHorizontalPadding,
right: _kActionSheetContentHorizontalPadding,
bottom: title == null ? _kActionSheetContentVerticalPadding : 22.0,
top: title == null ? _kActionSheetContentVerticalPadding : 0.0,
),
titleTextStyle: message == null
? _kActionSheetContentStyle
: _kActionSheetContentStyle.copyWith(fontWeight: FontWeight.w600),
messageTextStyle: title == null
? _kActionSheetContentStyle.copyWith(fontWeight: FontWeight.w600)
: _kActionSheetContentStyle,
additionalPaddingBetweenTitleAndMessage: const EdgeInsets.only(top: 8.0),
);
content.add(Flexible(child: titleSection));
}
return Container(
color: CupertinoDynamicColor.resolve(_kActionSheetBackgroundColor, context),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: content,
),
);
}
Widget _buildActions() {
if (actions == null || actions!.isEmpty) {
return Container(
height: 0.0,
);
}
return _CupertinoAlertActionSection(
scrollController: _effectiveActionScrollController,
hasCancelButton: cancelButton != null,
isActionSheet: true,
children: actions!,
);
}
Widget _buildCancelButton() {
final double cancelPadding = (actions != null || message != null || title != null)
? _kActionSheetCancelButtonPadding : 0.0;
return Padding(
padding: EdgeInsets.only(top: cancelPadding),
child: _CupertinoActionSheetCancelButton(
child: cancelButton,
),
);
}
@override
Widget build(BuildContext context) {
assert(debugCheckHasMediaQuery(context));
final List<Widget> children = <Widget>[
Flexible(child: ClipRRect(
borderRadius: const BorderRadius.all(Radius.circular(12.0)),
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: _kBlurAmount, sigmaY: _kBlurAmount),
child: _CupertinoDialogRenderWidget(
contentSection: Builder(builder: _buildContent),
actionsSection: _buildActions(),
dividerColor: _kActionSheetButtonDividerColor,
isActionSheet: true,
),
),
),
),
if (cancelButton != null) _buildCancelButton(),
];
final Orientation orientation = MediaQuery.of(context).orientation;
final double actionSheetWidth;
if (orientation == Orientation.portrait) {
actionSheetWidth = MediaQuery.of(context).size.width - (_kActionSheetEdgeHorizontalPadding * 2);
} else {
actionSheetWidth = MediaQuery.of(context).size.height - (_kActionSheetEdgeHorizontalPadding * 2);
}
return SafeArea(
child: ScrollConfiguration(
// A CupertinoScrollbar is built-in below
behavior: ScrollConfiguration.of(context).copyWith(scrollbars: false),
child: Semantics(
namesRoute: true,
scopesRoute: true,
explicitChildNodes: true,
label: 'Alert',
child: CupertinoUserInterfaceLevel(
data: CupertinoUserInterfaceLevelData.elevated,
child: Container(
width: actionSheetWidth,
margin: const EdgeInsets.symmetric(
horizontal: _kActionSheetEdgeHorizontalPadding,
vertical: _kActionSheetEdgeVerticalPadding,
),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: children,
),
),
),
),
),
);
}
}
/// A button typically used in a [CupertinoActionSheet].
///
/// See also:
///
/// * [CupertinoActionSheet], an alert that presents the user with a set of two or
/// more choices related to the current context.
class CupertinoActionSheetAction extends StatelessWidget {
/// Creates an action for an iOS-style action sheet.
///
/// The [child] and [onPressed] arguments must not be null.
const CupertinoActionSheetAction({
super.key,
required this.onPressed,
this.isDefaultAction = false,
this.isDestructiveAction = false,
required this.child,
}) : assert(child != null),
assert(onPressed != null);
/// The callback that is called when the button is tapped.
///
/// This attribute must not be null.
final VoidCallback onPressed;
/// Whether this action is the default choice in the action sheet.
///
/// Default buttons have bold text.
final bool isDefaultAction;
/// Whether this action might change or delete data.
///
/// Destructive buttons have red text.
final bool isDestructiveAction;
/// The widget below this widget in the tree.
///
/// Typically a [Text] widget.
final Widget child;
@override
Widget build(BuildContext context) {
TextStyle style = _kActionSheetActionStyle.copyWith(
color: isDestructiveAction
? CupertinoDynamicColor.resolve(CupertinoColors.systemRed, context)
: CupertinoTheme.of(context).primaryColor,
);
if (isDefaultAction) {
style = style.copyWith(fontWeight: FontWeight.w600);
}
return MouseRegion(
cursor: onPressed != null && kIsWeb ? SystemMouseCursors.click : MouseCursor.defer,
child: GestureDetector(
onTap: onPressed,
behavior: HitTestBehavior.opaque,
child: ConstrainedBox(
constraints: const BoxConstraints(
minHeight: _kActionSheetButtonHeight,
),
child: Semantics(
button: true,
child: Container(
alignment: Alignment.center,
padding: const EdgeInsets.symmetric(
vertical: 16.0,
horizontal: 10.0,
),
child: DefaultTextStyle(
style: style,
textAlign: TextAlign.center,
child: child,
),
),
),
),
),
);
}
}
class _CupertinoActionSheetCancelButton extends StatefulWidget {
const _CupertinoActionSheetCancelButton({
this.child,
});
final Widget? child;
@override
_CupertinoActionSheetCancelButtonState createState() => _CupertinoActionSheetCancelButtonState();
}
class _CupertinoActionSheetCancelButtonState extends State<_CupertinoActionSheetCancelButton> {
bool isBeingPressed = false;
void _onTapDown(TapDownDetails event) {
setState(() { isBeingPressed = true; });
}
void _onTapUp(TapUpDetails event) {
setState(() { isBeingPressed = false; });
}
void _onTapCancel() {
setState(() { isBeingPressed = false; });
}
@override
Widget build(BuildContext context) {
final Color backgroundColor = isBeingPressed
? _kActionSheetCancelPressedColor
: CupertinoColors.secondarySystemGroupedBackground;
return GestureDetector(
excludeFromSemantics: true,
onTapDown: _onTapDown,
onTapUp: _onTapUp,
onTapCancel: _onTapCancel,
child: Container(
decoration: BoxDecoration(
color: CupertinoDynamicColor.resolve(backgroundColor, context),
borderRadius: const BorderRadius.all(Radius.circular(_kCornerRadius)),
),
child: widget.child,
),
);
}
}
// iOS style layout policy widget for sizing an alert dialog's content section and
// action button section.
//
// See [_RenderCupertinoDialog] for specific layout policy details.
class _CupertinoDialogRenderWidget extends RenderObjectWidget {
const _CupertinoDialogRenderWidget({
required this.contentSection,
required this.actionsSection,
required this.dividerColor,
this.isActionSheet = false,
});
final Widget contentSection;
final Widget actionsSection;
final Color dividerColor;
final bool isActionSheet;
@override
RenderObject createRenderObject(BuildContext context) {
return _RenderCupertinoDialog(
dividerThickness: _kDividerThickness / MediaQuery.of(context).devicePixelRatio,
isInAccessibilityMode: _isInAccessibilityMode(context) && !isActionSheet,
dividerColor: CupertinoDynamicColor.resolve(dividerColor, context),
isActionSheet: isActionSheet,
);
}
@override
void updateRenderObject(BuildContext context, _RenderCupertinoDialog renderObject) {
renderObject
..isInAccessibilityMode = _isInAccessibilityMode(context) && !isActionSheet
..dividerColor = CupertinoDynamicColor.resolve(dividerColor, context);
}
@override
RenderObjectElement createElement() {
return _CupertinoDialogRenderElement(this, allowMoveRenderObjectChild: isActionSheet);
}
}
class _CupertinoDialogRenderElement extends RenderObjectElement {
_CupertinoDialogRenderElement(_CupertinoDialogRenderWidget super.widget, {this.allowMoveRenderObjectChild = false});
// Whether to allow overridden method moveRenderObjectChild call or default to super.
// CupertinoActionSheet should default to [super] but CupertinoAlertDialog not.
final bool allowMoveRenderObjectChild;
Element? _contentElement;
Element? _actionsElement;
@override
_RenderCupertinoDialog get renderObject => super.renderObject as _RenderCupertinoDialog;
@override
void visitChildren(ElementVisitor visitor) {
if (_contentElement != null) {
visitor(_contentElement!);
}
if (_actionsElement != null) {
visitor(_actionsElement!);
}
}
@override
void mount(Element? parent, Object? newSlot) {
super.mount(parent, newSlot);
final _CupertinoDialogRenderWidget dialogRenderWidget = widget as _CupertinoDialogRenderWidget;
_contentElement = updateChild(_contentElement, dialogRenderWidget.contentSection, _AlertDialogSections.contentSection);
_actionsElement = updateChild(_actionsElement, dialogRenderWidget.actionsSection, _AlertDialogSections.actionsSection);
}
@override
void insertRenderObjectChild(RenderObject child, _AlertDialogSections slot) {
_placeChildInSlot(child, slot);
}
@override
void moveRenderObjectChild(RenderObject child, _AlertDialogSections oldSlot, _AlertDialogSections newSlot) {
if (!allowMoveRenderObjectChild) {
super.moveRenderObjectChild(child, oldSlot, newSlot);
return;
}
_placeChildInSlot(child, newSlot);
}
@override
void update(RenderObjectWidget newWidget) {
super.update(newWidget);
final _CupertinoDialogRenderWidget dialogRenderWidget = widget as _CupertinoDialogRenderWidget;
_contentElement = updateChild(_contentElement, dialogRenderWidget.contentSection, _AlertDialogSections.contentSection);
_actionsElement = updateChild(_actionsElement, dialogRenderWidget.actionsSection, _AlertDialogSections.actionsSection);
}
@override
void forgetChild(Element child) {
assert(child == _contentElement || child == _actionsElement);
if (_contentElement == child) {
_contentElement = null;
} else {
assert(_actionsElement == child);
_actionsElement = null;
}
super.forgetChild(child);
}
@override
void removeRenderObjectChild(RenderObject child, _AlertDialogSections slot) {
assert(child == renderObject.contentSection || child == renderObject.actionsSection);
if (renderObject.contentSection == child) {
renderObject.contentSection = null;
} else {
assert(renderObject.actionsSection == child);
renderObject.actionsSection = null;
}
}
void _placeChildInSlot(RenderObject child, _AlertDialogSections slot) {
assert(slot != null);
switch (slot) {
case _AlertDialogSections.contentSection:
renderObject.contentSection = child as RenderBox;
break;
case _AlertDialogSections.actionsSection:
renderObject.actionsSection = child as RenderBox;
break;
}
}
}
// iOS style layout policy for sizing an alert dialog's content section and action
// button section.
//
// The policy is as follows:
//
// If all content and buttons fit on screen:
// The content section and action button section are sized intrinsically and centered
// vertically on screen.
//
// If all content and buttons do not fit on screen, and iOS is NOT in accessibility mode:
// A minimum height for the action button section is calculated. The action
// button section will not be rendered shorter than this minimum. See
// [_RenderCupertinoDialogActions] for the minimum height calculation.
//
// With the minimum action button section calculated, the content section can
// take up as much space as is available, up to the point that it hits the
// minimum button height at the bottom.
//
// After the content section is laid out, the action button section is allowed
// to take up any remaining space that was not consumed by the content section.
//
// If all content and buttons do not fit on screen, and iOS IS in accessibility mode:
// The button section is given up to 50% of the available height. Then the content
// section is given whatever height remains.
class _RenderCupertinoDialog extends RenderBox {
_RenderCupertinoDialog({
RenderBox? contentSection,
RenderBox? actionsSection,
double dividerThickness = 0.0,
bool isInAccessibilityMode = false,
bool isActionSheet = false,
required Color dividerColor,
}) : _contentSection = contentSection,
_actionsSection = actionsSection,
_dividerThickness = dividerThickness,
_isInAccessibilityMode = isInAccessibilityMode,
_isActionSheet = isActionSheet,
_dividerPaint = Paint()
..color = dividerColor
..style = PaintingStyle.fill;
RenderBox? get contentSection => _contentSection;
RenderBox? _contentSection;
set contentSection(RenderBox? newContentSection) {
if (newContentSection != _contentSection) {
if (_contentSection != null) {
dropChild(_contentSection!);
}
_contentSection = newContentSection;
if (_contentSection != null) {
adoptChild(_contentSection!);
}
}
}
RenderBox? get actionsSection => _actionsSection;
RenderBox? _actionsSection;
set actionsSection(RenderBox? newActionsSection) {
if (newActionsSection != _actionsSection) {
if (null != _actionsSection) {
dropChild(_actionsSection!);
}
_actionsSection = newActionsSection;
if (null != _actionsSection) {
adoptChild(_actionsSection!);
}
}
}
bool get isInAccessibilityMode => _isInAccessibilityMode;
bool _isInAccessibilityMode;
set isInAccessibilityMode(bool newValue) {
if (newValue != _isInAccessibilityMode) {
_isInAccessibilityMode = newValue;
markNeedsLayout();
}
}
bool _isActionSheet;
bool get isActionSheet => _isActionSheet;
set isActionSheet(bool newValue) {
if (newValue != _isActionSheet) {
_isActionSheet = newValue;
markNeedsLayout();
}
}
double get _dialogWidth => isInAccessibilityMode
? _kAccessibilityCupertinoDialogWidth
: _kCupertinoDialogWidth;
final double _dividerThickness;
final Paint _dividerPaint;
Color get dividerColor => _dividerPaint.color;
set dividerColor(Color newValue) {
if (dividerColor == newValue) {
return;
}
_dividerPaint.color = newValue;
markNeedsPaint();
}
@override
void attach(PipelineOwner owner) {
super.attach(owner);
if (null != contentSection) {
contentSection!.attach(owner);
}
if (null != actionsSection) {
actionsSection!.attach(owner);
}
}
@override
void detach() {
super.detach();
if (null != contentSection) {
contentSection!.detach();
}
if (null != actionsSection) {
actionsSection!.detach();
}
}
@override
void redepthChildren() {
if (null != contentSection) {
redepthChild(contentSection!);
}
if (null != actionsSection) {
redepthChild(actionsSection!);
}
}
@override
void setupParentData(RenderBox child) {
if (!isActionSheet && child.parentData is! BoxParentData) {
child.parentData = BoxParentData();
} else if (child.parentData is! MultiChildLayoutParentData) {
child.parentData = MultiChildLayoutParentData();
}
}
@override
void visitChildren(RenderObjectVisitor visitor) {
if (contentSection != null) {
visitor(contentSection!);
}
if (actionsSection != null) {
visitor(actionsSection!);
}
}
@override
List<DiagnosticsNode> debugDescribeChildren() => <DiagnosticsNode>[
if (contentSection != null) contentSection!.toDiagnosticsNode(name: 'content'),
if (actionsSection != null) actionsSection!.toDiagnosticsNode(name: 'actions'),
];
@override
double computeMinIntrinsicWidth(double height) {
return isActionSheet ? constraints.minWidth : _dialogWidth;
}
@override
double computeMaxIntrinsicWidth(double height) {
return isActionSheet ? constraints.maxWidth : _dialogWidth;
}
@override
double computeMinIntrinsicHeight(double width) {
final double contentHeight = contentSection!.getMinIntrinsicHeight(width);
final double actionsHeight = actionsSection!.getMinIntrinsicHeight(width);
final bool hasDivider = contentHeight > 0.0 && actionsHeight > 0.0;
double height = contentHeight + (hasDivider ? _dividerThickness : 0.0) + actionsHeight;
if (isActionSheet && (actionsHeight > 0 || contentHeight > 0)) {
height -= 2 * _kActionSheetEdgeVerticalPadding;
}
if (height.isFinite) {
return height;
}
return 0.0;
}
@override
double computeMaxIntrinsicHeight(double width) {
final double contentHeight = contentSection!.getMaxIntrinsicHeight(width);
final double actionsHeight = actionsSection!.getMaxIntrinsicHeight(width);
final bool hasDivider = contentHeight > 0.0 && actionsHeight > 0.0;
double height = contentHeight + (hasDivider ? _dividerThickness : 0.0) + actionsHeight;
if (isActionSheet && (actionsHeight > 0 || contentHeight > 0)) {
height -= 2 * _kActionSheetEdgeVerticalPadding;
}
if (height.isFinite) {
return height;
}
return 0.0;
}
@override
Size computeDryLayout(BoxConstraints constraints) {
return _performLayout(
constraints: constraints,
layoutChild: ChildLayoutHelper.dryLayoutChild,
).size;
}
@override
void performLayout() {
final _AlertDialogSizes dialogSizes = _performLayout(
constraints: constraints,
layoutChild: ChildLayoutHelper.layoutChild,
);
size = dialogSizes.size;
// Set the position of the actions box to sit at the bottom of the dialog.
// The content box defaults to the top left, which is where we want it.
assert(
(!isActionSheet && actionsSection!.parentData is BoxParentData) ||
(isActionSheet && actionsSection!.parentData is MultiChildLayoutParentData),
);
if (isActionSheet) {
final MultiChildLayoutParentData actionParentData = actionsSection!.parentData! as MultiChildLayoutParentData;
actionParentData.offset = Offset(0.0, dialogSizes.contentHeight + dialogSizes.dividerThickness);
} else {
final BoxParentData actionParentData = actionsSection!.parentData! as BoxParentData;
actionParentData.offset = Offset(0.0, dialogSizes.contentHeight + dialogSizes.dividerThickness);
}
}
_AlertDialogSizes _performLayout({required BoxConstraints constraints, required ChildLayouter layoutChild}) {
return isInAccessibilityMode
? performAccessibilityLayout(
constraints: constraints,
layoutChild: layoutChild,
) : performRegularLayout(
constraints: constraints,
layoutChild: layoutChild,
);
}
// When not in accessibility mode, an alert dialog might reduce the space
// for buttons to just over 1 button's height to make room for the content
// section.
_AlertDialogSizes performRegularLayout({required BoxConstraints constraints, required ChildLayouter layoutChild}) {
final bool hasDivider = contentSection!.getMaxIntrinsicHeight(computeMaxIntrinsicWidth(0)) > 0.0
&& actionsSection!.getMaxIntrinsicHeight(computeMaxIntrinsicWidth(0)) > 0.0;
final double dividerThickness = hasDivider ? _dividerThickness : 0.0;
final double minActionsHeight = actionsSection!.getMinIntrinsicHeight(computeMaxIntrinsicWidth(0));
final Size contentSize = layoutChild(
contentSection!,
constraints.deflate(EdgeInsets.only(bottom: minActionsHeight + dividerThickness)),
);
final Size actionsSize = layoutChild(
actionsSection!,
constraints.deflate(EdgeInsets.only(top: contentSize.height + dividerThickness)),
);
final double dialogHeight = contentSize.height + dividerThickness + actionsSize.height;
return _AlertDialogSizes(
size: isActionSheet
? Size(constraints.maxWidth, dialogHeight)
: constraints.constrain(Size(_dialogWidth, dialogHeight)),
contentHeight: contentSize.height,
dividerThickness: dividerThickness,
);
}
// When in accessibility mode, an alert dialog will allow buttons to take
// up to 50% of the dialog height, even if the content exceeds available space.
_AlertDialogSizes performAccessibilityLayout({required BoxConstraints constraints, required ChildLayouter layoutChild}) {
final bool hasDivider = contentSection!.getMaxIntrinsicHeight(_dialogWidth) > 0.0
&& actionsSection!.getMaxIntrinsicHeight(_dialogWidth) > 0.0;
final double dividerThickness = hasDivider ? _dividerThickness : 0.0;
final double maxContentHeight = contentSection!.getMaxIntrinsicHeight(_dialogWidth);
final double maxActionsHeight = actionsSection!.getMaxIntrinsicHeight(_dialogWidth);
final Size contentSize;
final Size actionsSize;
if (maxContentHeight + dividerThickness + maxActionsHeight > constraints.maxHeight) {
// AlertDialog: There isn't enough room for everything. Following iOS's
// accessibility dialog layout policy, first we allow the actions to take
// up to 50% of the dialog height. Second we fill the rest of the
// available space with the content section.
actionsSize = layoutChild(
actionsSection!,
constraints.deflate(EdgeInsets.only(top: constraints.maxHeight / 2.0)),
);
contentSize = layoutChild(
contentSection!,
constraints.deflate(EdgeInsets.only(bottom: actionsSize.height + dividerThickness)),
);
} else {
// Everything fits. Give content and actions all the space they want.
contentSize = layoutChild(
contentSection!,
constraints,
);
actionsSize = layoutChild(
actionsSection!,
constraints.deflate(EdgeInsets.only(top: contentSize.height)),
);
}
// Calculate overall dialog height.
final double dialogHeight = contentSize.height + dividerThickness + actionsSize.height;
return _AlertDialogSizes(
size: constraints.constrain(Size(_dialogWidth, dialogHeight)),
contentHeight: contentSize.height,
dividerThickness: dividerThickness,
);
}
@override
void paint(PaintingContext context, Offset offset) {
if (isActionSheet) {
final MultiChildLayoutParentData contentParentData = contentSection!.parentData! as MultiChildLayoutParentData;
contentSection!.paint(context, offset + contentParentData.offset);
} else {
final BoxParentData contentParentData = contentSection!.parentData! as BoxParentData;
contentSection!.paint(context, offset + contentParentData.offset);
}
final bool hasDivider = contentSection!.size.height > 0.0 && actionsSection!.size.height > 0.0;
if (hasDivider) {
_paintDividerBetweenContentAndActions(context.canvas, offset);
}
if (isActionSheet) {
final MultiChildLayoutParentData actionsParentData = actionsSection!.parentData! as MultiChildLayoutParentData;
actionsSection!.paint(context, offset + actionsParentData.offset);
} else {
final BoxParentData actionsParentData = actionsSection!.parentData! as BoxParentData;
actionsSection!.paint(context, offset + actionsParentData.offset);
}
}
void _paintDividerBetweenContentAndActions(Canvas canvas, Offset offset) {
canvas.drawRect(
Rect.fromLTWH(
offset.dx,
offset.dy + contentSection!.size.height,
size.width,
_dividerThickness,
),
_dividerPaint,
);
}
@override
bool hitTestChildren(BoxHitTestResult result, { required Offset position }) {
if (isActionSheet) {
final MultiChildLayoutParentData contentSectionParentData = contentSection!.parentData! as MultiChildLayoutParentData;
final MultiChildLayoutParentData actionsSectionParentData = actionsSection!.parentData! as MultiChildLayoutParentData;
return result.addWithPaintOffset(
offset: contentSectionParentData.offset,
position: position,
hitTest: (BoxHitTestResult result, Offset transformed) {
assert(transformed == position - contentSectionParentData.offset);
return contentSection!.hitTest(result, position: transformed);
},
) ||
result.addWithPaintOffset(
offset: actionsSectionParentData.offset,
position: position,
hitTest: (BoxHitTestResult result, Offset transformed) {
assert(transformed == position - actionsSectionParentData.offset);
return actionsSection!.hitTest(result, position: transformed);
},
);
}
final BoxParentData contentSectionParentData = contentSection!.parentData! as BoxParentData;
final BoxParentData actionsSectionParentData = actionsSection!.parentData! as BoxParentData;
return result.addWithPaintOffset(
offset: contentSectionParentData.offset,
position: position,
hitTest: (BoxHitTestResult result, Offset transformed) {
assert(transformed == position - contentSectionParentData.offset);
return contentSection!.hitTest(result, position: transformed);
},
) ||
result.addWithPaintOffset(
offset: actionsSectionParentData.offset,
position: position,
hitTest: (BoxHitTestResult result, Offset transformed) {
assert(transformed == position - actionsSectionParentData.offset);
return actionsSection!.hitTest(result, position: transformed);
},
);
}
}
class _AlertDialogSizes {
const _AlertDialogSizes({
required this.size,
required this.contentHeight,
required this.dividerThickness,
});
final Size size;
final double contentHeight;
final double dividerThickness;
}
// Visual components of an alert dialog that need to be explicitly sized and
// laid out at runtime.
enum _AlertDialogSections {
contentSection,
actionsSection,
}
// The "content section" of a CupertinoAlertDialog.
//
// If title is missing, then only content is added. If content is
// missing, then only title is added. If both are missing, then it returns
// a SingleChildScrollView with a zero-sized Container.
class _CupertinoAlertContentSection extends StatelessWidget {
const _CupertinoAlertContentSection({
this.title,
this.message,
this.scrollController,
this.titlePadding,
this.messagePadding,
this.titleTextStyle,
this.messageTextStyle,
this.additionalPaddingBetweenTitleAndMessage,
}) : assert(title == null || titlePadding != null && titleTextStyle != null),
assert(message == null || messagePadding != null && messageTextStyle != null);
// The (optional) title of the dialog is displayed in a large font at the top
// of the dialog.
//
// Typically a Text widget.
final Widget? title;
// The (optional) message of the dialog is displayed in the center of the
// dialog in a lighter font.
//
// Typically a Text widget.
final Widget? message;
// A scroll controller that can be used to control the scrolling of the
// content in the dialog.
//
// Defaults to null, and is typically not needed, since most alert contents
// are short.
final ScrollController? scrollController;
// Paddings used around title and message.
// CupertinoAlertDialog and CupertinoActionSheet have different paddings.
final EdgeInsets? titlePadding;
final EdgeInsets? messagePadding;
// Additional padding to be inserted between title and message.
// Only used for CupertinoActionSheet.
final EdgeInsets? additionalPaddingBetweenTitleAndMessage;
// Text styles used for title and message.
// CupertinoAlertDialog and CupertinoActionSheet have different text styles.
final TextStyle? titleTextStyle;
final TextStyle? messageTextStyle;
@override
Widget build(BuildContext context) {
if (title == null && message == null) {
return SingleChildScrollView(
controller: scrollController,
child: const SizedBox.shrink(),
);
}
final List<Widget> titleContentGroup = <Widget>[
if (title != null)
Padding(
padding: titlePadding!,
child: DefaultTextStyle(
style: titleTextStyle!,
textAlign: TextAlign.center,
child: title!,
),
),
if (message != null)
Padding(
padding: messagePadding!,
child: DefaultTextStyle(
style: messageTextStyle!,
textAlign: TextAlign.center,
child: message!,
),
),
];
// Add padding between the widgets if necessary.
if (additionalPaddingBetweenTitleAndMessage != null && titleContentGroup.length > 1) {
titleContentGroup.insert(1, Padding(padding: additionalPaddingBetweenTitleAndMessage!));
}
return CupertinoScrollbar(
controller: scrollController,
child: SingleChildScrollView(
controller: scrollController,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: titleContentGroup,
),
),
);
}
}
// The "actions section" of a [CupertinoAlertDialog].
//
// See [_RenderCupertinoDialogActions] for details about action button sizing
// and layout.
class _CupertinoAlertActionSection extends StatefulWidget {
const _CupertinoAlertActionSection({
required this.children,
this.scrollController,
this.hasCancelButton = false,
this.isActionSheet = false,
}) : assert(children != null);
final List<Widget> children;
// A scroll controller that can be used to control the scrolling of the
// actions in the dialog.
//
// Defaults to null, and is typically not needed, since most alert dialogs
// don't have many actions.
final ScrollController? scrollController;
// Used in ActionSheet to denote if ActionSheet has a separate so-called
// cancel button.
//
// Defaults to false, and is not needed in dialogs.
final bool hasCancelButton;
final bool isActionSheet;
@override
_CupertinoAlertActionSectionState createState() =>
_CupertinoAlertActionSectionState();
}
class _CupertinoAlertActionSectionState
extends State<_CupertinoAlertActionSection> {
@override
Widget build(BuildContext context) {
final double devicePixelRatio = MediaQuery.of(context).devicePixelRatio;
final List<Widget> interactiveButtons = <Widget>[];
for (int i = 0; i < widget.children.length; i += 1) {
interactiveButtons.add(
_PressableActionButton(
child: widget.children[i],
),
);
}
return CupertinoScrollbar(
controller: widget.scrollController,
child: SingleChildScrollView(
controller: widget.scrollController,
child: _CupertinoDialogActionsRenderWidget(
actionButtons: interactiveButtons,
dividerThickness: _kDividerThickness / devicePixelRatio,
hasCancelButton: widget.hasCancelButton,
isActionSheet: widget.isActionSheet,
),
),
);
}
}
// Button that updates its render state when pressed.
//
// The pressed state is forwarded to an _ActionButtonParentDataWidget. The
// corresponding _ActionButtonParentData is then interpreted and rendered
// appropriately by _RenderCupertinoDialogActions.
class _PressableActionButton extends StatefulWidget {
const _PressableActionButton({
required this.child,
});
final Widget child;
@override
_PressableActionButtonState createState() => _PressableActionButtonState();
}
class _PressableActionButtonState extends State<_PressableActionButton> {
bool _isPressed = false;
@override
Widget build(BuildContext context) {
return _ActionButtonParentDataWidget(
isPressed: _isPressed,
child: MergeSemantics(
// TODO(mattcarroll): Button press dynamics need overhaul for iOS:
// https://github.com/flutter/flutter/issues/19786
child: GestureDetector(
excludeFromSemantics: true,
behavior: HitTestBehavior.opaque,
onTapDown: (TapDownDetails details) => setState(() {
_isPressed = true;
}),
onTapUp: (TapUpDetails details) => setState(() {
_isPressed = false;
}),
// TODO(mattcarroll): Cancel is currently triggered when user moves
// past slop instead of off button: https://github.com/flutter/flutter/issues/19783
onTapCancel: () => setState(() => _isPressed = false),
child: widget.child,
),
),
);
}
}
// ParentDataWidget that updates _ActionButtonParentData for an action button.
//
// Each action button requires knowledge of whether or not it is pressed so that
// the dialog can correctly render the button. The pressed state is held within
// _ActionButtonParentData. _ActionButtonParentDataWidget is responsible for
// updating the pressed state of an _ActionButtonParentData based on the
// incoming [isPressed] property.
class _ActionButtonParentDataWidget
extends ParentDataWidget<_ActionButtonParentData> {
const _ActionButtonParentDataWidget({
required this.isPressed,
required super.child,
});
final bool isPressed;
@override
void applyParentData(RenderObject renderObject) {
assert(renderObject.parentData is _ActionButtonParentData);
final _ActionButtonParentData parentData =
renderObject.parentData! as _ActionButtonParentData;
if (parentData.isPressed != isPressed) {
parentData.isPressed = isPressed;
// Force a repaint.
final AbstractNode? targetParent = renderObject.parent;
if (targetParent is RenderObject) {
targetParent.markNeedsPaint();
}
}
}
@override
Type get debugTypicalAncestorWidgetClass =>
_CupertinoDialogActionsRenderWidget;
}
// ParentData applied to individual action buttons that report whether or not
// that button is currently pressed by the user.
class _ActionButtonParentData extends MultiChildLayoutParentData {
bool isPressed = false;
}
/// A button typically used in a [CupertinoAlertDialog].
///
/// See also:
///
/// * [CupertinoAlertDialog], a dialog that informs the user about situations
/// that require acknowledgment.
class CupertinoDialogAction extends StatelessWidget {
/// Creates an action for an iOS-style dialog.
const CupertinoDialogAction({
super.key,
this.onPressed,
this.isDefaultAction = false,
this.isDestructiveAction = false,
this.textStyle,
required this.child,
}) : assert(child != null),
assert(isDefaultAction != null),
assert(isDestructiveAction != null);
/// The callback that is called when the button is tapped or otherwise
/// activated.
///
/// If this is set to null, the button will be disabled.
final VoidCallback? onPressed;
/// Set to true if button is the default choice in the dialog.
///
/// Default buttons have bold text. Similar to
/// [UIAlertController.preferredAction](https://developer.apple.com/documentation/uikit/uialertcontroller/1620102-preferredaction),
/// but more than one action can have this attribute set to true in the same
/// [CupertinoAlertDialog].
///
/// This parameters defaults to false and cannot be null.
final bool isDefaultAction;
/// Whether this action destroys an object.
///
/// For example, an action that deletes an email is destructive.
///
/// Defaults to false and cannot be null.
final bool isDestructiveAction;
/// [TextStyle] to apply to any text that appears in this button.
///
/// Dialog actions have a built-in text resizing policy for long text. To
/// ensure that this resizing policy always works as expected, [textStyle]
/// must be used if a text size is desired other than that specified in
/// [_kCupertinoDialogActionStyle].
final TextStyle? textStyle;
/// The widget below this widget in the tree.
///
/// Typically a [Text] widget.
final Widget child;
/// Whether the button is enabled or disabled. Buttons are disabled by
/// default. To enable a button, set its [onPressed] property to a non-null
/// value.
bool get enabled => onPressed != null;
double _calculatePadding(BuildContext context) {
return 8.0 * MediaQuery.textScaleFactorOf(context);
}
// Dialog action content shrinks to fit, up to a certain point, and if it still
// cannot fit at the minimum size, the text content is ellipsized.
//
// This policy only applies when the device is not in accessibility mode.
Widget _buildContentWithRegularSizingPolicy({
required BuildContext context,
required TextStyle textStyle,
required Widget content,
}) {
final bool isInAccessibilityMode = _isInAccessibilityMode(context);
final double dialogWidth = isInAccessibilityMode
? _kAccessibilityCupertinoDialogWidth
: _kCupertinoDialogWidth;
final double textScaleFactor = MediaQuery.textScaleFactorOf(context);
// The fontSizeRatio is the ratio of the current text size (including any
// iOS scale factor) vs the minimum text size that we allow in action
// buttons. This ratio information is used to automatically scale down action
// button text to fit the available space.
final double fontSizeRatio = (textScaleFactor * textStyle.fontSize!) / _kDialogMinButtonFontSize;
final double padding = _calculatePadding(context);
return IntrinsicHeight(
child: SizedBox(
width: double.infinity,
child: FittedBox(
fit: BoxFit.scaleDown,
child: ConstrainedBox(
constraints: BoxConstraints(
maxWidth: fontSizeRatio * (dialogWidth - (2 * padding)),
),
child: Semantics(
button: true,
onTap: onPressed,
child: DefaultTextStyle(
style: textStyle,
textAlign: TextAlign.center,
overflow: TextOverflow.ellipsis,
maxLines: 1,
child: content,
),
),
),
),
),
);
}
// Dialog action content is permitted to be as large as it wants when in
// accessibility mode. If text is used as the content, the text wraps instead
// of ellipsizing.
Widget _buildContentWithAccessibilitySizingPolicy({
required TextStyle textStyle,
required Widget content,
}) {
return DefaultTextStyle(
style: textStyle,
textAlign: TextAlign.center,
child: content,
);
}
@override
Widget build(BuildContext context) {
TextStyle style = _kCupertinoDialogActionStyle.copyWith(
color: CupertinoDynamicColor.resolve(
isDestructiveAction ? CupertinoColors.systemRed : CupertinoTheme.of(context).primaryColor,
context,
),
);
style = style.merge(textStyle);
if (isDefaultAction) {
style = style.copyWith(fontWeight: FontWeight.w600);
}
if (!enabled) {
style = style.copyWith(color: style.color!.withOpacity(0.5));
}
// Apply a sizing policy to the action button's content based on whether or
// not the device is in accessibility mode.
// TODO(mattcarroll): The following logic is not entirely correct. It is also
// the case that if content text does not contain a space, it should also
// wrap instead of ellipsizing. We are consciously not implementing that
// now due to complexity.
final Widget sizedContent = _isInAccessibilityMode(context)
? _buildContentWithAccessibilitySizingPolicy(
textStyle: style,
content: child,
)
: _buildContentWithRegularSizingPolicy(
context: context,
textStyle: style,
content: child,
);
return MouseRegion(
cursor: onPressed != null && kIsWeb ? SystemMouseCursors.click : MouseCursor.defer,
child: GestureDetector(
excludeFromSemantics: true,
onTap: onPressed,
behavior: HitTestBehavior.opaque,
child: ConstrainedBox(
constraints: const BoxConstraints(
minHeight: _kDialogMinButtonHeight,
),
child: Container(
alignment: Alignment.center,
padding: EdgeInsets.all(_calculatePadding(context)),
child: sizedContent,
),
),
),
);
}
}
// iOS style dialog action button layout.
//
// [_CupertinoDialogActionsRenderWidget] does not provide any scrolling
// behavior for its buttons. It only handles the sizing and layout of buttons.
// Scrolling behavior can be composed on top of this widget, if desired.
//
// See [_RenderCupertinoDialogActions] for specific layout policy details.
class _CupertinoDialogActionsRenderWidget extends MultiChildRenderObjectWidget {
_CupertinoDialogActionsRenderWidget({
required List<Widget> actionButtons,
double dividerThickness = 0.0,
bool hasCancelButton = false,
bool isActionSheet = false,
}) : _dividerThickness = dividerThickness,
_hasCancelButton = hasCancelButton,
_isActionSheet = isActionSheet,
super(children: actionButtons);
final double _dividerThickness;
final bool _hasCancelButton;
final bool _isActionSheet;
@override
RenderObject createRenderObject(BuildContext context) {
return _RenderCupertinoDialogActions(
dialogWidth: _isActionSheet
? null
: _isInAccessibilityMode(context)
? _kAccessibilityCupertinoDialogWidth
: _kCupertinoDialogWidth,
dividerThickness: _dividerThickness,
dialogColor: CupertinoDynamicColor.resolve(_isActionSheet ? _kActionSheetBackgroundColor : _kDialogColor, context),
dialogPressedColor: CupertinoDynamicColor.resolve(_kPressedColor, context),
dividerColor: CupertinoDynamicColor.resolve(_isActionSheet ? _kActionSheetButtonDividerColor : CupertinoColors.separator, context),
hasCancelButton: _hasCancelButton,
isActionSheet: _isActionSheet,
);
}
@override
void updateRenderObject(BuildContext context, _RenderCupertinoDialogActions renderObject) {
renderObject
..dialogWidth = _isActionSheet
? null
: _isInAccessibilityMode(context)
? _kAccessibilityCupertinoDialogWidth
: _kCupertinoDialogWidth
..dividerThickness = _dividerThickness
..dialogColor = CupertinoDynamicColor.resolve(_isActionSheet ? _kActionSheetBackgroundColor : _kDialogColor, context)
..dialogPressedColor = CupertinoDynamicColor.resolve(_kPressedColor, context)
..dividerColor = CupertinoDynamicColor.resolve(_isActionSheet ? _kActionSheetButtonDividerColor : CupertinoColors.separator, context)
..hasCancelButton = _hasCancelButton
..isActionSheet = _isActionSheet;
}
}
// iOS style layout policy for sizing and positioning an alert dialog's action
// buttons.
//
// The policy is as follows:
//
// If a single action button is provided, or if 2 action buttons are provided
// that can fit side-by-side, then action buttons are sized and laid out in a
// single horizontal row. The row is exactly as wide as the dialog, and the row
// is as tall as the tallest action button. A horizontal divider is drawn above
// the button row. If 2 action buttons are provided, a vertical divider is
// drawn between them. The thickness of the divider is set by [dividerThickness].
//
// If 2 action buttons are provided but they cannot fit side-by-side, then the
// 2 buttons are stacked vertically. A horizontal divider is drawn above each
// button. The thickness of the divider is set by [dividerThickness]. The minimum
// height of this [RenderBox] in the case of 2 stacked buttons is as tall as
// the 2 buttons stacked. This is different than the 3+ button case where the
// minimum height is only 1.5 buttons tall. See the 3+ button explanation for
// more info.
//
// If 3+ action buttons are provided then they are all stacked vertically. A
// horizontal divider is drawn above each button. The thickness of the divider
// is set by [dividerThickness]. The minimum height of this [RenderBox] in the case
// of 3+ stacked buttons is as tall as the 1st button + 50% the height of the
// 2nd button. In other words, the minimum height is 1.5 buttons tall. This
// minimum height of 1.5 buttons is expected to work in tandem with a surrounding
// [ScrollView] to match the iOS dialog behavior.
//
// Each button is expected to have an _ActionButtonParentData which reports
// whether or not that button is currently pressed. If a button is pressed,
// then the dividers above and below that pressed button are not drawn - instead
// they are filled with the standard white dialog background color. The one
// exception is the very 1st divider which is always rendered. This policy comes
// from observation of native iOS dialogs.
class _RenderCupertinoDialogActions extends RenderBox
with ContainerRenderObjectMixin<RenderBox, MultiChildLayoutParentData>,
RenderBoxContainerDefaultsMixin<RenderBox, MultiChildLayoutParentData> {
_RenderCupertinoDialogActions({
List<RenderBox>? children,
double? dialogWidth,
double dividerThickness = 0.0,
required Color dialogColor,
required Color dialogPressedColor,
required Color dividerColor,
bool hasCancelButton = false,
bool isActionSheet = false,
}) : assert(isActionSheet || dialogWidth != null),
_dialogWidth = dialogWidth,
_buttonBackgroundPaint = Paint()
..color = dialogColor
..style = PaintingStyle.fill,
_pressedButtonBackgroundPaint = Paint()
..color = dialogPressedColor
..style = PaintingStyle.fill,
_dividerPaint = Paint()
..color = dividerColor
..style = PaintingStyle.fill,
_dividerThickness = dividerThickness,
_hasCancelButton = hasCancelButton,
_isActionSheet = isActionSheet {
addAll(children);
}
double? get dialogWidth => _dialogWidth;
double? _dialogWidth;
set dialogWidth(double? newWidth) {
if (newWidth != _dialogWidth) {
_dialogWidth = newWidth;
markNeedsLayout();
}
}
// The thickness of the divider between buttons.
double get dividerThickness => _dividerThickness;
double _dividerThickness;
set dividerThickness(double newValue) {
if (newValue != _dividerThickness) {
_dividerThickness = newValue;
markNeedsLayout();
}
}
bool _hasCancelButton;
bool get hasCancelButton => _hasCancelButton;
set hasCancelButton(bool newValue) {
if (newValue == _hasCancelButton) {
return;
}
_hasCancelButton = newValue;
markNeedsLayout();
}
Color get dialogColor => _buttonBackgroundPaint.color;
final Paint _buttonBackgroundPaint;
set dialogColor(Color value) {
if (value == _buttonBackgroundPaint.color) {
return;
}
_buttonBackgroundPaint.color = value;
markNeedsPaint();
}
Color get dialogPressedColor => _pressedButtonBackgroundPaint.color;
final Paint _pressedButtonBackgroundPaint;
set dialogPressedColor(Color value) {
if (value == _pressedButtonBackgroundPaint.color) {
return;
}
_pressedButtonBackgroundPaint.color = value;
markNeedsPaint();
}
Color get dividerColor => _dividerPaint.color;
final Paint _dividerPaint;
set dividerColor(Color value) {
if (value == _dividerPaint.color) {
return;
}
_dividerPaint.color = value;
markNeedsPaint();
}
bool get isActionSheet => _isActionSheet;
bool _isActionSheet;
set isActionSheet(bool value) {
if (value == _isActionSheet) {
return;
}
_isActionSheet = value;
markNeedsPaint();
}
Iterable<RenderBox> get _pressedButtons {
final List<RenderBox> boxes = <RenderBox>[];
RenderBox? currentChild = firstChild;
while (currentChild != null) {
assert(currentChild.parentData is _ActionButtonParentData);
final _ActionButtonParentData parentData = currentChild.parentData! as _ActionButtonParentData;
if (parentData.isPressed) {
boxes.add(currentChild);
}
currentChild = childAfter(currentChild);
}
return boxes;
}
bool get _isButtonPressed {
RenderBox? currentChild = firstChild;
while (currentChild != null) {
assert(currentChild.parentData is _ActionButtonParentData);
final _ActionButtonParentData parentData = currentChild.parentData! as _ActionButtonParentData;
if (parentData.isPressed) {
return true;
}
currentChild = childAfter(currentChild);
}
return false;
}
@override
void setupParentData(RenderBox child) {
if (child.parentData is! _ActionButtonParentData) {
child.parentData = _ActionButtonParentData();
}
}
@override
double computeMinIntrinsicWidth(double height) {
return isActionSheet ? constraints.minWidth : dialogWidth!;
}
@override
double computeMaxIntrinsicWidth(double height) {
return isActionSheet ? constraints.maxWidth : dialogWidth!;
}
@override
double computeMinIntrinsicHeight(double width) {
if (childCount == 0) {
return 0.0;
} else if (isActionSheet) {
if (childCount == 1) {
return firstChild!.computeMaxIntrinsicHeight(width) + dividerThickness;
}
if (hasCancelButton && childCount < 4) {
return _computeMinIntrinsicHeightWithCancel(width);
}
return _computeMinIntrinsicHeightStacked(width);
} else if (childCount == 1) {
// If only 1 button, display the button across the entire dialog.
return _computeMinIntrinsicHeightSideBySide(width);
} else if (childCount == 2 && _isSingleButtonRow(width)) {
// The first 2 buttons fit side-by-side. Display them horizontally.
return _computeMinIntrinsicHeightSideBySide(width);
}
// 3+ buttons are always stacked. The minimum height when stacked is
// 1.5 buttons tall.
return _computeMinIntrinsicHeightStacked(width);
}
// The minimum height for more than 2-3 buttons when a cancel button is
// included is the full height of button stack.
double _computeMinIntrinsicHeightWithCancel(double width) {
assert(childCount == 2 || childCount == 3);
if (childCount == 2) {
return firstChild!.getMinIntrinsicHeight(width)
+ childAfter(firstChild!)!.getMinIntrinsicHeight(width)
+ dividerThickness;
}
return firstChild!.getMinIntrinsicHeight(width)
+ childAfter(firstChild!)!.getMinIntrinsicHeight(width)
+ childAfter(childAfter(firstChild!)!)!.getMinIntrinsicHeight(width)
+ (dividerThickness * 2);
}
// The minimum height for a single row of buttons is the larger of the buttons'
// min intrinsic heights.
double _computeMinIntrinsicHeightSideBySide(double width) {
assert(childCount >= 1 && childCount <= 2);
final double minHeight;
if (childCount == 1) {
minHeight = firstChild!.getMinIntrinsicHeight(width);
} else {
final double perButtonWidth = (width - dividerThickness) / 2.0;
minHeight = math.max(
firstChild!.getMinIntrinsicHeight(perButtonWidth),
lastChild!.getMinIntrinsicHeight(perButtonWidth),
);
}
return minHeight;
}
// Dialog: The minimum height for 2+ stacked buttons is the height of the 1st
// button + 50% the height of the 2nd button + the divider between the two.
//
// ActionSheet: The minimum height for more than 2 buttons when no cancel
// button or 4+ buttons when a cancel button is included is the height of the
// 1st button + 50% the height of the 2nd button + 2 dividers.
double _computeMinIntrinsicHeightStacked(double width) {
assert(childCount >= 2);
return firstChild!.getMinIntrinsicHeight(width)
+ dividerThickness
+ (0.5 * childAfter(firstChild!)!.getMinIntrinsicHeight(width));
}
@override
double computeMaxIntrinsicHeight(double width) {
if (childCount == 0) {
// No buttons. Zero height.
return 0.0;
} else if (isActionSheet) {
if (childCount == 1) {
return firstChild!.computeMaxIntrinsicHeight(width) + dividerThickness;
}
return _computeMaxIntrinsicHeightStacked(width);
} else if (childCount == 1) {
// One button. Our max intrinsic height is equal to the button's.
return firstChild!.getMaxIntrinsicHeight(width);
} else if (childCount == 2) {
// Two buttons...
if (_isSingleButtonRow(width)) {
// The 2 buttons fit side by side so our max intrinsic height is equal
// to the taller of the 2 buttons.
final double perButtonWidth = (width - dividerThickness) / 2.0;
return math.max(
firstChild!.getMaxIntrinsicHeight(perButtonWidth),
lastChild!.getMaxIntrinsicHeight(perButtonWidth),
);
} else {
// The 2 buttons do not fit side by side. Measure total height as a
// vertical stack.
return _computeMaxIntrinsicHeightStacked(width);
}
}
// Three+ buttons. Stack the buttons vertically with dividers and measure
// the overall height.
return _computeMaxIntrinsicHeightStacked(width);
}
// Max height of a stack of buttons is the sum of all button heights + a
// divider for each button.
double _computeMaxIntrinsicHeightStacked(double width) {
assert(childCount >= 2);
final double allDividersHeight = (childCount - 1) * dividerThickness;
double heightAccumulation = allDividersHeight;
RenderBox? button = firstChild;
while (button != null) {
heightAccumulation += button.getMaxIntrinsicHeight(width);
button = childAfter(button);
}
return heightAccumulation;
}
bool _isSingleButtonRow(double width) {
final bool isSingleButtonRow;
if (childCount == 1) {
isSingleButtonRow = true;
} else if (childCount == 2) {
// There are 2 buttons. If they can fit side-by-side then that's what
// we want to do. Otherwise, stack them vertically.
final double sideBySideWidth = firstChild!.getMaxIntrinsicWidth(double.infinity)
+ dividerThickness
+ lastChild!.getMaxIntrinsicWidth(double.infinity);
isSingleButtonRow = sideBySideWidth <= width;
} else {
isSingleButtonRow = false;
}
return isSingleButtonRow;
}
@override
Size computeDryLayout(BoxConstraints constraints) {
return _performLayout(constraints: constraints, dry: true);
}
@override
void performLayout() {
size = _performLayout(constraints: constraints);
}
Size _performLayout({required BoxConstraints constraints, bool dry = false}) {
final ChildLayouter layoutChild = dry
? ChildLayoutHelper.dryLayoutChild
: ChildLayoutHelper.layoutChild;
if (!isActionSheet && _isSingleButtonRow(dialogWidth!)) {
if (childCount == 1) {
// We have 1 button. Our size is the width of the dialog and the height
// of the single button.
final Size childSize = layoutChild(
firstChild!,
constraints,
);
return constraints.constrain(
Size(dialogWidth!, childSize.height),
);
} else {
// Each button gets half the available width, minus a single divider.
final BoxConstraints perButtonConstraints = BoxConstraints(
minWidth: (constraints.minWidth - dividerThickness) / 2.0,
maxWidth: (constraints.maxWidth - dividerThickness) / 2.0,
);
// Layout the 2 buttons.
final Size firstChildSize = layoutChild(
firstChild!,
perButtonConstraints,
);
final Size lastChildSize = layoutChild(
lastChild!,
perButtonConstraints,
);
if (!dry) {
// The 2nd button needs to be offset to the right.
assert(lastChild!.parentData is MultiChildLayoutParentData);
final MultiChildLayoutParentData secondButtonParentData = lastChild!.parentData! as MultiChildLayoutParentData;
secondButtonParentData.offset = Offset(firstChildSize.width + dividerThickness, 0.0);
}
// Calculate our size based on the button sizes.
return constraints.constrain(
Size(
dialogWidth!,
math.max(
firstChildSize.height,
lastChildSize.height,
),
),
);
}
} else {
// We need to stack buttons vertically, plus dividers above each button (except the 1st).
final BoxConstraints perButtonConstraints = constraints.copyWith(
minHeight: 0.0,
maxHeight: double.infinity,
);
RenderBox? child = firstChild;
int index = 0;
double verticalOffset = 0.0;
while (child != null) {
final Size childSize = layoutChild(
child,
perButtonConstraints,
);
if (!dry) {
assert(child.parentData is MultiChildLayoutParentData);
final MultiChildLayoutParentData parentData = child.parentData! as MultiChildLayoutParentData;
parentData.offset = Offset(0.0, verticalOffset);
}
verticalOffset += childSize.height;
if (index < childCount - 1) {
// Add a gap for the next divider.
verticalOffset += dividerThickness;
}
index += 1;
child = childAfter(child);
}
// Our height is the accumulated height of all buttons and dividers.
return constraints.constrain(
Size(computeMaxIntrinsicWidth(0), verticalOffset),
);
}
}
@override
void paint(PaintingContext context, Offset offset) {
final Canvas canvas = context.canvas;
if (!isActionSheet && _isSingleButtonRow(size.width)) {
_drawButtonBackgroundsAndDividersSingleRow(canvas, offset);
} else {
_drawButtonBackgroundsAndDividersStacked(canvas, offset);
}
_drawButtons(context, offset);
}
void _drawButtonBackgroundsAndDividersSingleRow(Canvas canvas, Offset offset) {
// The vertical divider sits between the left button and right button (if
// the dialog has 2 buttons). The vertical divider is hidden if either the
// left or right button is pressed.
final Rect verticalDivider = childCount == 2 && !_isButtonPressed
? Rect.fromLTWH(
offset.dx + firstChild!.size.width,
offset.dy,
dividerThickness,
math.max(
firstChild!.size.height,
lastChild!.size.height,
),
)
: Rect.zero;
final List<Rect> pressedButtonRects = _pressedButtons.map<Rect>((RenderBox pressedButton) {
final MultiChildLayoutParentData buttonParentData = pressedButton.parentData! as MultiChildLayoutParentData;
return Rect.fromLTWH(
offset.dx + buttonParentData.offset.dx,
offset.dy + buttonParentData.offset.dy,
pressedButton.size.width,
pressedButton.size.height,
);
}).toList();
// Create the button backgrounds path and paint it.
final Path backgroundFillPath = Path()
..fillType = PathFillType.evenOdd
..addRect(Rect.fromLTWH(0.0, 0.0, size.width, size.height))
..addRect(verticalDivider);
for (int i = 0; i < pressedButtonRects.length; i += 1) {
backgroundFillPath.addRect(pressedButtonRects[i]);
}
canvas.drawPath(
backgroundFillPath,
_buttonBackgroundPaint,
);
// Create the pressed buttons background path and paint it.
final Path pressedBackgroundFillPath = Path();
for (int i = 0; i < pressedButtonRects.length; i += 1) {
pressedBackgroundFillPath.addRect(pressedButtonRects[i]);
}
canvas.drawPath(
pressedBackgroundFillPath,
_pressedButtonBackgroundPaint,
);
// Create the dividers path and paint it.
final Path dividersPath = Path()
..addRect(verticalDivider);
canvas.drawPath(
dividersPath,
_dividerPaint,
);
}
void _drawButtonBackgroundsAndDividersStacked(Canvas canvas, Offset offset) {
final Offset dividerOffset = Offset(0.0, dividerThickness);
final Path backgroundFillPath = Path()
..fillType = PathFillType.evenOdd
..addRect(Rect.fromLTWH(0.0, 0.0, size.width, size.height));
final Path pressedBackgroundFillPath = Path();
final Path dividersPath = Path();
Offset accumulatingOffset = offset;
RenderBox? child = firstChild;
RenderBox? prevChild;
while (child != null) {
assert(child.parentData is _ActionButtonParentData);
final _ActionButtonParentData currentButtonParentData = child.parentData! as _ActionButtonParentData;
final bool isButtonPressed = currentButtonParentData.isPressed;
bool isPrevButtonPressed = false;
if (prevChild != null) {
assert(prevChild.parentData is _ActionButtonParentData);
final _ActionButtonParentData previousButtonParentData = prevChild.parentData! as _ActionButtonParentData;
isPrevButtonPressed = previousButtonParentData.isPressed;
}
final bool isDividerPresent = child != firstChild;
final bool isDividerPainted = isDividerPresent && !(isButtonPressed || isPrevButtonPressed);
final Rect dividerRect = Rect.fromLTWH(
accumulatingOffset.dx,
accumulatingOffset.dy,
size.width,
dividerThickness,
);
final Rect buttonBackgroundRect = Rect.fromLTWH(
accumulatingOffset.dx,
accumulatingOffset.dy + (isDividerPresent ? dividerThickness : 0.0),
size.width,
child.size.height,
);
// If this button is pressed, then we don't want a white background to be
// painted, so we erase this button from the background path.
if (isButtonPressed) {
backgroundFillPath.addRect(buttonBackgroundRect);
pressedBackgroundFillPath.addRect(buttonBackgroundRect);
}
// If this divider is needed, then we erase the divider area from the
// background path, and on top of that we paint a translucent gray to
// darken the divider area.
if (isDividerPainted) {
backgroundFillPath.addRect(dividerRect);
dividersPath.addRect(dividerRect);
}
accumulatingOffset += (isDividerPresent ? dividerOffset : Offset.zero)
+ Offset(0.0, child.size.height);
prevChild = child;
child = childAfter(child);
}
canvas.drawPath(backgroundFillPath, _buttonBackgroundPaint);
canvas.drawPath(pressedBackgroundFillPath, _pressedButtonBackgroundPaint);
canvas.drawPath(dividersPath, _dividerPaint);
}
void _drawButtons(PaintingContext context, Offset offset) {
RenderBox? child = firstChild;
while (child != null) {
final MultiChildLayoutParentData childParentData = child.parentData! as MultiChildLayoutParentData;
context.paintChild(child, childParentData.offset + offset);
child = childAfter(child);
}
}
@override
bool hitTestChildren(BoxHitTestResult result, {required Offset position}) {
return defaultHitTestChildren(result, position: position);
}
}