871 lines
31 KiB
Dart
871 lines
31 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/widgets.dart';
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import 'checkbox_theme.dart';
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import 'color_scheme.dart';
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import 'colors.dart';
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import 'constants.dart';
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import 'debug.dart';
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import 'material_state.dart';
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import 'theme.dart';
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import 'theme_data.dart';
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import 'toggleable.dart';
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// Examples can assume:
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// bool _throwShotAway = false;
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// late StateSetter setState;
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/// A Material Design checkbox.
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///
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/// The checkbox itself does not maintain any state. Instead, when the state of
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/// the checkbox changes, the widget calls the [onChanged] callback. Most
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/// widgets that use a checkbox will listen for the [onChanged] callback and
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/// rebuild the checkbox with a new [value] to update the visual appearance of
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/// the checkbox.
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///
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/// The checkbox can optionally display three values - true, false, and null -
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/// if [tristate] is true. When [value] is null a dash is displayed. By default
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/// [tristate] is false and the checkbox's [value] must be true or false.
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///
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/// Requires one of its ancestors to be a [Material] widget.
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///
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/// {@tool dartpad}
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/// This example shows how you can override the default theme of
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/// of a [Checkbox] with a [MaterialStateProperty].
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/// In this example, the checkbox's color will be `Colors.blue` when the [Checkbox]
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/// is being pressed, hovered, or focused. Otherwise, the checkbox's color will
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/// be `Colors.red`.
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///
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/// ** See code in examples/api/lib/material/checkbox/checkbox.0.dart **
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/// {@end-tool}
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///
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/// See also:
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///
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/// * [CheckboxListTile], which combines this widget with a [ListTile] so that
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/// you can give the checkbox a label.
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/// * [Switch], a widget with semantics similar to [Checkbox].
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/// * [Radio], for selecting among a set of explicit values.
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/// * [Slider], for selecting a value in a range.
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/// * <https://material.io/design/components/selection-controls.html#checkboxes>
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/// * <https://material.io/design/components/lists.html#types>
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class Checkbox extends StatefulWidget {
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/// Creates a Material Design checkbox.
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///
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/// The checkbox itself does not maintain any state. Instead, when the state of
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/// the checkbox changes, the widget calls the [onChanged] callback. Most
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/// widgets that use a checkbox will listen for the [onChanged] callback and
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/// rebuild the checkbox with a new [value] to update the visual appearance of
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/// the checkbox.
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///
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/// The following arguments are required:
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///
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/// * [value], which determines whether the checkbox is checked. The [value]
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/// can only be null if [tristate] is true.
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/// * [onChanged], which is called when the value of the checkbox should
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/// change. It can be set to null to disable the checkbox.
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///
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/// The values of [tristate] and [autofocus] must not be null.
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const Checkbox({
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super.key,
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required this.value,
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this.tristate = false,
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required this.onChanged,
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this.mouseCursor,
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this.activeColor,
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this.fillColor,
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this.checkColor,
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this.focusColor,
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this.hoverColor,
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this.overlayColor,
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this.splashRadius,
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this.materialTapTargetSize,
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this.visualDensity,
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this.focusNode,
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this.autofocus = false,
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this.shape,
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this.side,
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this.isError = false,
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}) : assert(tristate != null),
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assert(tristate || value != null),
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assert(autofocus != null);
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/// Whether this checkbox is checked.
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///
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/// When [tristate] is true, a value of null corresponds to the mixed state.
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/// When [tristate] is false, this value must not be null.
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final bool? value;
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/// Called when the value of the checkbox should change.
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///
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/// The checkbox passes the new value to the callback but does not actually
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/// change state until the parent widget rebuilds the checkbox with the new
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/// value.
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///
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/// If this callback is null, the checkbox will be displayed as disabled
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/// and will not respond to input gestures.
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///
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/// When the checkbox is tapped, if [tristate] is false (the default) then
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/// the [onChanged] callback will be applied to `!value`. If [tristate] is
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/// true this callback cycle from false to true to null.
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///
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/// The callback provided to [onChanged] should update the state of the parent
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/// [StatefulWidget] using the [State.setState] method, so that the parent
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/// gets rebuilt; for example:
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///
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/// ```dart
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/// Checkbox(
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/// value: _throwShotAway,
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/// onChanged: (bool? newValue) {
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/// setState(() {
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/// _throwShotAway = newValue!;
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/// });
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/// },
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/// )
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/// ```
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final ValueChanged<bool?>? onChanged;
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/// {@template flutter.material.checkbox.mouseCursor}
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/// The cursor for a mouse pointer when it enters or is hovering over the
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/// widget.
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///
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/// If [mouseCursor] is a [MaterialStateProperty<MouseCursor>],
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/// [MaterialStateProperty.resolve] is used for the following [MaterialState]s:
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///
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/// * [MaterialState.selected].
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/// * [MaterialState.hovered].
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/// * [MaterialState.focused].
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/// * [MaterialState.disabled].
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/// {@endtemplate}
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///
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/// When [value] is null and [tristate] is true, [MaterialState.selected] is
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/// included as a state.
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///
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/// If null, then the value of [CheckboxThemeData.mouseCursor] is used. If
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/// that is also null, then [MaterialStateMouseCursor.clickable] is used.
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///
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/// See also:
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///
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/// * [MaterialStateMouseCursor], a [MouseCursor] that implements
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/// `MaterialStateProperty` which is used in APIs that need to accept
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/// either a [MouseCursor] or a [MaterialStateProperty<MouseCursor>].
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final MouseCursor? mouseCursor;
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/// The color to use when this checkbox is checked.
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///
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/// Defaults to [ColorScheme.secondary].
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///
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/// If [fillColor] returns a non-null color in the [MaterialState.selected]
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/// state, it will be used instead of this color.
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final Color? activeColor;
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/// {@template flutter.material.checkbox.fillColor}
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/// The color that fills the checkbox, in all [MaterialState]s.
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///
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/// Resolves in the following states:
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/// * [MaterialState.selected].
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/// * [MaterialState.hovered].
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/// * [MaterialState.focused].
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/// * [MaterialState.disabled].
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///
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/// {@tool snippet}
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/// This example resolves the [fillColor] based on the current [MaterialState]
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/// of the [Checkbox], providing a different [Color] when it is
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/// [MaterialState.disabled].
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///
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/// ```dart
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/// Checkbox(
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/// value: true,
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/// onChanged: (_){},
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/// fillColor: MaterialStateProperty.resolveWith<Color>((Set<MaterialState> states) {
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/// if (states.contains(MaterialState.disabled)) {
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/// return Colors.orange.withOpacity(.32);
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/// }
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/// return Colors.orange;
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/// })
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/// )
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/// ```
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/// {@end-tool}
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/// {@endtemplate}
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///
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/// If null, then the value of [activeColor] is used in the selected
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/// state. If that is also null, the value of [CheckboxThemeData.fillColor]
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/// is used. If that is also null, then [ThemeData.disabledColor] is used in
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/// the disabled state, [ColorScheme.secondary] is used in the
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/// selected state, and [ThemeData.unselectedWidgetColor] is used in the
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/// default state.
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final MaterialStateProperty<Color?>? fillColor;
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/// {@template flutter.material.checkbox.checkColor}
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/// The color to use for the check icon when this checkbox is checked.
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/// {@endtemplate}
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///
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/// If null, then the value of [CheckboxThemeData.checkColor] is used. If
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/// that is also null, then Color(0xFFFFFFFF) is used.
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final Color? checkColor;
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/// If true the checkbox's [value] can be true, false, or null.
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///
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/// [Checkbox] displays a dash when its value is null.
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///
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/// When a tri-state checkbox ([tristate] is true) is tapped, its [onChanged]
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/// callback will be applied to true if the current value is false, to null if
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/// value is true, and to false if value is null (i.e. it cycles through false
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/// => true => null => false when tapped).
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///
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/// If tristate is false (the default), [value] must not be null.
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final bool tristate;
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/// {@template flutter.material.checkbox.materialTapTargetSize}
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/// Configures the minimum size of the tap target.
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/// {@endtemplate}
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///
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/// If null, then the value of [CheckboxThemeData.materialTapTargetSize] is
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/// used. If that is also null, then the value of
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/// [ThemeData.materialTapTargetSize] is used.
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///
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/// See also:
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///
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/// * [MaterialTapTargetSize], for a description of how this affects tap targets.
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final MaterialTapTargetSize? materialTapTargetSize;
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/// {@template flutter.material.checkbox.visualDensity}
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/// Defines how compact the checkbox's layout will be.
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/// {@endtemplate}
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///
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/// {@macro flutter.material.themedata.visualDensity}
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///
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/// If null, then the value of [CheckboxThemeData.visualDensity] is used. If
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/// that is also null, then the value of [ThemeData.visualDensity] is used.
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///
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/// See also:
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///
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/// * [ThemeData.visualDensity], which specifies the [visualDensity] for all
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/// widgets within a [Theme].
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final VisualDensity? visualDensity;
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/// The color for the checkbox's [Material] when it has the input focus.
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///
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/// If [overlayColor] returns a non-null color in the [MaterialState.focused]
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/// state, it will be used instead.
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///
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/// If null, then the value of [CheckboxThemeData.overlayColor] is used in the
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/// focused state. If that is also null, then the value of
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/// [ThemeData.focusColor] is used.
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final Color? focusColor;
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/// The color for the checkbox's [Material] when a pointer is hovering over it.
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///
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/// If [overlayColor] returns a non-null color in the [MaterialState.hovered]
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/// state, it will be used instead.
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///
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/// If null, then the value of [CheckboxThemeData.overlayColor] is used in the
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/// hovered state. If that is also null, then the value of
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/// [ThemeData.hoverColor] is used.
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final Color? hoverColor;
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/// {@template flutter.material.checkbox.overlayColor}
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/// The color for the checkbox's [Material].
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///
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/// Resolves in the following states:
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/// * [MaterialState.pressed].
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/// * [MaterialState.selected].
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/// * [MaterialState.hovered].
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/// * [MaterialState.focused].
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/// {@endtemplate}
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///
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/// If null, then the value of [activeColor] with alpha
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/// [kRadialReactionAlpha], [focusColor] and [hoverColor] is used in the
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/// pressed, focused and hovered state. If that is also null,
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/// the value of [CheckboxThemeData.overlayColor] is used. If that is
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/// also null, then the value of [ColorScheme.secondary] with alpha
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/// [kRadialReactionAlpha], [ThemeData.focusColor] and [ThemeData.hoverColor]
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/// is used in the pressed, focused and hovered state.
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final MaterialStateProperty<Color?>? overlayColor;
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/// {@template flutter.material.checkbox.splashRadius}
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/// The splash radius of the circular [Material] ink response.
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/// {@endtemplate}
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///
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/// If null, then the value of [CheckboxThemeData.splashRadius] is used. If
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/// that is also null, then [kRadialReactionRadius] is used.
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final double? splashRadius;
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/// {@macro flutter.widgets.Focus.focusNode}
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final FocusNode? focusNode;
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/// {@macro flutter.widgets.Focus.autofocus}
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final bool autofocus;
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/// {@template flutter.material.checkbox.shape}
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/// The shape of the checkbox's [Material].
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/// {@endtemplate}
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///
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/// If this property is null then [CheckboxThemeData.shape] of [ThemeData.checkboxTheme]
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/// is used. If that's null then the shape will be a [RoundedRectangleBorder]
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/// with a circular corner radius of 1.0.
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final OutlinedBorder? shape;
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/// {@template flutter.material.checkbox.side}
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/// The color and width of the checkbox's border.
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///
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/// This property can be a [MaterialStateBorderSide] that can
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/// specify different border color and widths depending on the
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/// checkbox's state.
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///
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/// Resolves in the following states:
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/// * [MaterialState.pressed].
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/// * [MaterialState.selected].
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/// * [MaterialState.hovered].
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/// * [MaterialState.focused].
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/// * [MaterialState.disabled].
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///
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/// If this property is not a [MaterialStateBorderSide] and it is
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/// non-null, then it is only rendered when the checkbox's value is
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/// false. The difference in interpretation is for backwards
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/// compatibility.
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/// {@endtemplate}
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///
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/// If this property is null, then [CheckboxThemeData.side] of
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/// [ThemeData.checkboxTheme] is used. If that is also null, then the side
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/// will be width 2.
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final BorderSide? side;
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/// True if this checkbox wants to show an error state.
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///
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/// The checkbox will have different default container color and check color when
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/// this is true. This is only used when [ThemeData.useMaterial3] is set to true.
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///
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/// Must not be null. Defaults to false.
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final bool isError;
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/// The width of a checkbox widget.
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static const double width = 18.0;
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@override
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State<Checkbox> createState() => _CheckboxState();
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}
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class _CheckboxState extends State<Checkbox> with TickerProviderStateMixin, ToggleableStateMixin {
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final _CheckboxPainter _painter = _CheckboxPainter();
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bool? _previousValue;
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@override
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void initState() {
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super.initState();
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_previousValue = widget.value;
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}
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@override
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void didUpdateWidget(Checkbox oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.value != widget.value) {
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_previousValue = oldWidget.value;
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animateToValue();
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}
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}
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@override
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void dispose() {
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_painter.dispose();
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super.dispose();
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}
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@override
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ValueChanged<bool?>? get onChanged => widget.onChanged;
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@override
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bool get tristate => widget.tristate;
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@override
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bool? get value => widget.value;
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MaterialStateProperty<Color?> get _widgetFillColor {
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return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
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if (states.contains(MaterialState.disabled)) {
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return null;
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}
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if (states.contains(MaterialState.selected)) {
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return widget.activeColor;
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}
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return null;
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});
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}
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BorderSide? _resolveSide(BorderSide? side) {
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if (side is MaterialStateBorderSide) {
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return MaterialStateProperty.resolveAs<BorderSide?>(side, states);
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}
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if (!states.contains(MaterialState.selected)) {
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return side;
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}
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return null;
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}
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@override
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Widget build(BuildContext context) {
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assert(debugCheckHasMaterial(context));
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final CheckboxThemeData checkboxTheme = CheckboxTheme.of(context);
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final CheckboxThemeData defaults = Theme.of(context).useMaterial3
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? _CheckboxDefaultsM3(context)
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: _CheckboxDefaultsM2(context);
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final MaterialTapTargetSize effectiveMaterialTapTargetSize = widget.materialTapTargetSize
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?? checkboxTheme.materialTapTargetSize
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?? defaults.materialTapTargetSize!;
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final VisualDensity effectiveVisualDensity = widget.visualDensity
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?? checkboxTheme.visualDensity
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?? defaults.visualDensity!;
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Size size;
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switch (effectiveMaterialTapTargetSize) {
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case MaterialTapTargetSize.padded:
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size = const Size(kMinInteractiveDimension, kMinInteractiveDimension);
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break;
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case MaterialTapTargetSize.shrinkWrap:
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size = const Size(kMinInteractiveDimension - 8.0, kMinInteractiveDimension - 8.0);
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break;
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}
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size += effectiveVisualDensity.baseSizeAdjustment;
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final MaterialStateProperty<MouseCursor> effectiveMouseCursor = MaterialStateProperty.resolveWith<MouseCursor>((Set<MaterialState> states) {
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return MaterialStateProperty.resolveAs<MouseCursor?>(widget.mouseCursor, states)
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?? checkboxTheme.mouseCursor?.resolve(states)
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?? MaterialStateMouseCursor.clickable.resolve(states);
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});
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// Colors need to be resolved in selected and non selected states separately
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// so that they can be lerped between.
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final Set<MaterialState> errorState = states..add(MaterialState.error);
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final Set<MaterialState> activeStates = widget.isError ? (errorState..add(MaterialState.selected)) : states..add(MaterialState.selected);
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final Set<MaterialState> inactiveStates = widget.isError ? (errorState..remove(MaterialState.selected)) : states..remove(MaterialState.selected);
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final Color? activeColor = widget.fillColor?.resolve(activeStates)
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?? _widgetFillColor.resolve(activeStates)
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?? checkboxTheme.fillColor?.resolve(activeStates);
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final Color effectiveActiveColor = activeColor
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?? defaults.fillColor!.resolve(activeStates)!;
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final Color? inactiveColor = widget.fillColor?.resolve(inactiveStates)
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?? _widgetFillColor.resolve(inactiveStates)
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?? checkboxTheme.fillColor?.resolve(inactiveStates);
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final Color effectiveInactiveColor = inactiveColor
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?? defaults.fillColor!.resolve(inactiveStates)!;
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final Set<MaterialState> focusedStates = widget.isError ? (errorState..add(MaterialState.focused)) : states..add(MaterialState.focused);
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Color effectiveFocusOverlayColor = widget.overlayColor?.resolve(focusedStates)
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?? widget.focusColor
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?? checkboxTheme.overlayColor?.resolve(focusedStates)
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?? defaults.overlayColor!.resolve(focusedStates)!;
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final Set<MaterialState> hoveredStates = widget.isError ? (errorState..add(MaterialState.hovered)) : states..add(MaterialState.hovered);
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Color effectiveHoverOverlayColor = widget.overlayColor?.resolve(hoveredStates)
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?? widget.hoverColor
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?? checkboxTheme.overlayColor?.resolve(hoveredStates)
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?? defaults.overlayColor!.resolve(hoveredStates)!;
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final Set<MaterialState> activePressedStates = activeStates..add(MaterialState.pressed);
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final Color effectiveActivePressedOverlayColor = widget.overlayColor?.resolve(activePressedStates)
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?? checkboxTheme.overlayColor?.resolve(activePressedStates)
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?? activeColor?.withAlpha(kRadialReactionAlpha)
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?? defaults.overlayColor!.resolve(activePressedStates)!;
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final Set<MaterialState> inactivePressedStates = inactiveStates..add(MaterialState.pressed);
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final Color effectiveInactivePressedOverlayColor = widget.overlayColor?.resolve(inactivePressedStates)
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?? checkboxTheme.overlayColor?.resolve(inactivePressedStates)
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?? inactiveColor?.withAlpha(kRadialReactionAlpha)
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?? defaults.overlayColor!.resolve(inactivePressedStates)!;
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if (downPosition != null) {
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effectiveHoverOverlayColor = states.contains(MaterialState.selected)
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? effectiveActivePressedOverlayColor
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: effectiveInactivePressedOverlayColor;
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effectiveFocusOverlayColor = states.contains(MaterialState.selected)
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? effectiveActivePressedOverlayColor
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|
: effectiveInactivePressedOverlayColor;
|
|
}
|
|
|
|
final Set<MaterialState> checkStates = widget.isError ? (states..add(MaterialState.error)) : states;
|
|
final Color effectiveCheckColor = widget.checkColor
|
|
?? checkboxTheme.checkColor?.resolve(checkStates)
|
|
?? defaults.checkColor!.resolve(checkStates)!;
|
|
|
|
final double effectiveSplashRadius = widget.splashRadius
|
|
?? checkboxTheme.splashRadius
|
|
?? defaults.splashRadius!;
|
|
|
|
return Semantics(
|
|
checked: widget.value ?? false,
|
|
mixed: widget.tristate ? widget.value == null : null,
|
|
child: buildToggleable(
|
|
mouseCursor: effectiveMouseCursor,
|
|
focusNode: widget.focusNode,
|
|
autofocus: widget.autofocus,
|
|
size: size,
|
|
painter: _painter
|
|
..position = position
|
|
..reaction = reaction
|
|
..reactionFocusFade = reactionFocusFade
|
|
..reactionHoverFade = reactionHoverFade
|
|
..inactiveReactionColor = effectiveInactivePressedOverlayColor
|
|
..reactionColor = effectiveActivePressedOverlayColor
|
|
..hoverColor = effectiveHoverOverlayColor
|
|
..focusColor = effectiveFocusOverlayColor
|
|
..splashRadius = effectiveSplashRadius
|
|
..downPosition = downPosition
|
|
..isFocused = states.contains(MaterialState.focused)
|
|
..isHovered = states.contains(MaterialState.hovered)
|
|
..activeColor = effectiveActiveColor
|
|
..inactiveColor = effectiveInactiveColor
|
|
..checkColor = effectiveCheckColor
|
|
..value = value
|
|
..previousValue = _previousValue
|
|
..shape = widget.shape ?? checkboxTheme.shape ?? const RoundedRectangleBorder(
|
|
borderRadius: BorderRadius.all(Radius.circular(1.0)),
|
|
)
|
|
..side = _resolveSide(widget.side) ?? _resolveSide(checkboxTheme.side),
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
const double _kEdgeSize = Checkbox.width;
|
|
const double _kStrokeWidth = 2.0;
|
|
|
|
class _CheckboxPainter extends ToggleablePainter {
|
|
Color get checkColor => _checkColor!;
|
|
Color? _checkColor;
|
|
set checkColor(Color value) {
|
|
if (_checkColor == value) {
|
|
return;
|
|
}
|
|
_checkColor = value;
|
|
notifyListeners();
|
|
}
|
|
|
|
bool? get value => _value;
|
|
bool? _value;
|
|
set value(bool? value) {
|
|
if (_value == value) {
|
|
return;
|
|
}
|
|
_value = value;
|
|
notifyListeners();
|
|
}
|
|
|
|
bool? get previousValue => _previousValue;
|
|
bool? _previousValue;
|
|
set previousValue(bool? value) {
|
|
if (_previousValue == value) {
|
|
return;
|
|
}
|
|
_previousValue = value;
|
|
notifyListeners();
|
|
}
|
|
|
|
OutlinedBorder get shape => _shape!;
|
|
OutlinedBorder? _shape;
|
|
set shape(OutlinedBorder value) {
|
|
if (_shape == value) {
|
|
return;
|
|
}
|
|
_shape = value;
|
|
notifyListeners();
|
|
}
|
|
|
|
BorderSide? get side => _side;
|
|
BorderSide? _side;
|
|
set side(BorderSide? value) {
|
|
if (_side == value) {
|
|
return;
|
|
}
|
|
_side = value;
|
|
notifyListeners();
|
|
}
|
|
|
|
// The square outer bounds of the checkbox at t, with the specified origin.
|
|
// At t == 0.0, the outer rect's size is _kEdgeSize (Checkbox.width)
|
|
// At t == 0.5, .. is _kEdgeSize - _kStrokeWidth
|
|
// At t == 1.0, .. is _kEdgeSize
|
|
Rect _outerRectAt(Offset origin, double t) {
|
|
final double inset = 1.0 - (t - 0.5).abs() * 2.0;
|
|
final double size = _kEdgeSize - inset * _kStrokeWidth;
|
|
final Rect rect = Rect.fromLTWH(origin.dx + inset, origin.dy + inset, size, size);
|
|
return rect;
|
|
}
|
|
|
|
// The checkbox's border color if value == false, or its fill color when
|
|
// value == true or null.
|
|
Color _colorAt(double t) {
|
|
// As t goes from 0.0 to 0.25, animate from the inactiveColor to activeColor.
|
|
return t >= 0.25 ? activeColor : Color.lerp(inactiveColor, activeColor, t * 4.0)!;
|
|
}
|
|
|
|
// White stroke used to paint the check and dash.
|
|
Paint _createStrokePaint() {
|
|
return Paint()
|
|
..color = checkColor
|
|
..style = PaintingStyle.stroke
|
|
..strokeWidth = _kStrokeWidth;
|
|
}
|
|
|
|
void _drawBox(Canvas canvas, Rect outer, Paint paint, BorderSide? side, bool fill) {
|
|
if (fill) {
|
|
canvas.drawPath(shape.getOuterPath(outer), paint);
|
|
}
|
|
if (side != null) {
|
|
shape.copyWith(side: side).paint(canvas, outer);
|
|
}
|
|
}
|
|
|
|
void _drawCheck(Canvas canvas, Offset origin, double t, Paint paint) {
|
|
assert(t >= 0.0 && t <= 1.0);
|
|
// As t goes from 0.0 to 1.0, animate the two check mark strokes from the
|
|
// short side to the long side.
|
|
final Path path = Path();
|
|
const Offset start = Offset(_kEdgeSize * 0.15, _kEdgeSize * 0.45);
|
|
const Offset mid = Offset(_kEdgeSize * 0.4, _kEdgeSize * 0.7);
|
|
const Offset end = Offset(_kEdgeSize * 0.85, _kEdgeSize * 0.25);
|
|
if (t < 0.5) {
|
|
final double strokeT = t * 2.0;
|
|
final Offset drawMid = Offset.lerp(start, mid, strokeT)!;
|
|
path.moveTo(origin.dx + start.dx, origin.dy + start.dy);
|
|
path.lineTo(origin.dx + drawMid.dx, origin.dy + drawMid.dy);
|
|
} else {
|
|
final double strokeT = (t - 0.5) * 2.0;
|
|
final Offset drawEnd = Offset.lerp(mid, end, strokeT)!;
|
|
path.moveTo(origin.dx + start.dx, origin.dy + start.dy);
|
|
path.lineTo(origin.dx + mid.dx, origin.dy + mid.dy);
|
|
path.lineTo(origin.dx + drawEnd.dx, origin.dy + drawEnd.dy);
|
|
}
|
|
canvas.drawPath(path, paint);
|
|
}
|
|
|
|
void _drawDash(Canvas canvas, Offset origin, double t, Paint paint) {
|
|
assert(t >= 0.0 && t <= 1.0);
|
|
// As t goes from 0.0 to 1.0, animate the horizontal line from the
|
|
// mid point outwards.
|
|
const Offset start = Offset(_kEdgeSize * 0.2, _kEdgeSize * 0.5);
|
|
const Offset mid = Offset(_kEdgeSize * 0.5, _kEdgeSize * 0.5);
|
|
const Offset end = Offset(_kEdgeSize * 0.8, _kEdgeSize * 0.5);
|
|
final Offset drawStart = Offset.lerp(start, mid, 1.0 - t)!;
|
|
final Offset drawEnd = Offset.lerp(mid, end, t)!;
|
|
canvas.drawLine(origin + drawStart, origin + drawEnd, paint);
|
|
}
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
paintRadialReaction(canvas: canvas, origin: size.center(Offset.zero));
|
|
|
|
final Paint strokePaint = _createStrokePaint();
|
|
final Offset origin = size / 2.0 - const Size.square(_kEdgeSize) / 2.0 as Offset;
|
|
final AnimationStatus status = position.status;
|
|
final double tNormalized = status == AnimationStatus.forward || status == AnimationStatus.completed
|
|
? position.value
|
|
: 1.0 - position.value;
|
|
|
|
// Four cases: false to null, false to true, null to false, true to false
|
|
if (previousValue == false || value == false) {
|
|
final double t = value == false ? 1.0 - tNormalized : tNormalized;
|
|
final Rect outer = _outerRectAt(origin, t);
|
|
final Paint paint = Paint()..color = _colorAt(t);
|
|
|
|
if (t <= 0.5) {
|
|
final BorderSide border = side ?? BorderSide(width: 2, color: paint.color);
|
|
_drawBox(canvas, outer, paint, border, false); // only paint the border
|
|
} else {
|
|
_drawBox(canvas, outer, paint, side, true);
|
|
final double tShrink = (t - 0.5) * 2.0;
|
|
if (previousValue == null || value == null) {
|
|
_drawDash(canvas, origin, tShrink, strokePaint);
|
|
} else {
|
|
_drawCheck(canvas, origin, tShrink, strokePaint);
|
|
}
|
|
}
|
|
} else { // Two cases: null to true, true to null
|
|
final Rect outer = _outerRectAt(origin, 1.0);
|
|
final Paint paint = Paint() ..color = _colorAt(1.0);
|
|
|
|
_drawBox(canvas, outer, paint, side, true);
|
|
if (tNormalized <= 0.5) {
|
|
final double tShrink = 1.0 - tNormalized * 2.0;
|
|
if (previousValue ?? false) {
|
|
_drawCheck(canvas, origin, tShrink, strokePaint);
|
|
} else {
|
|
_drawDash(canvas, origin, tShrink, strokePaint);
|
|
}
|
|
} else {
|
|
final double tExpand = (tNormalized - 0.5) * 2.0;
|
|
if (value ?? false) {
|
|
_drawCheck(canvas, origin, tExpand, strokePaint);
|
|
} else {
|
|
_drawDash(canvas, origin, tExpand, strokePaint);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Hand coded defaults based on Material Design 2.
|
|
class _CheckboxDefaultsM2 extends CheckboxThemeData {
|
|
_CheckboxDefaultsM2(BuildContext context)
|
|
: _theme = Theme.of(context),
|
|
_colors = Theme.of(context).colorScheme;
|
|
|
|
final ThemeData _theme;
|
|
final ColorScheme _colors;
|
|
|
|
@override
|
|
MaterialStateProperty<Color> get fillColor {
|
|
return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
|
|
if (states.contains(MaterialState.disabled)) {
|
|
return _theme.disabledColor;
|
|
}
|
|
if (states.contains(MaterialState.selected)) {
|
|
return _colors.secondary;
|
|
}
|
|
return _theme.unselectedWidgetColor;
|
|
});
|
|
}
|
|
|
|
@override
|
|
MaterialStateProperty<Color> get checkColor {
|
|
return MaterialStateProperty.all<Color>(const Color(0xFFFFFFFF));
|
|
}
|
|
|
|
@override
|
|
MaterialStateProperty<Color?> get overlayColor {
|
|
return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
|
|
if (states.contains(MaterialState.pressed)) {
|
|
return fillColor.resolve(states).withAlpha(kRadialReactionAlpha);
|
|
}
|
|
if (states.contains(MaterialState.hovered)) {
|
|
return _theme.hoverColor;
|
|
}
|
|
if (states.contains(MaterialState.focused)) {
|
|
return _theme.focusColor;
|
|
}
|
|
return Colors.transparent;
|
|
});
|
|
}
|
|
|
|
@override
|
|
double get splashRadius => kRadialReactionRadius;
|
|
|
|
@override
|
|
MaterialTapTargetSize get materialTapTargetSize => _theme.materialTapTargetSize;
|
|
|
|
@override
|
|
VisualDensity get visualDensity => _theme.visualDensity;
|
|
}
|
|
|
|
// BEGIN GENERATED TOKEN PROPERTIES - Checkbox
|
|
|
|
// Do not edit by hand. The code between the "BEGIN GENERATED" and
|
|
// "END GENERATED" comments are generated from data in the Material
|
|
// Design token database by the script:
|
|
// dev/tools/gen_defaults/bin/gen_defaults.dart.
|
|
|
|
// Token database version: v0_137
|
|
|
|
class _CheckboxDefaultsM3 extends CheckboxThemeData {
|
|
_CheckboxDefaultsM3(BuildContext context)
|
|
: _theme = Theme.of(context),
|
|
_colors = Theme.of(context).colorScheme;
|
|
|
|
final ThemeData _theme;
|
|
final ColorScheme _colors;
|
|
|
|
@override
|
|
MaterialStateProperty<Color> get fillColor {
|
|
return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
|
|
if (states.contains(MaterialState.disabled)) {
|
|
return _colors.onSurface.withOpacity(0.38);
|
|
}
|
|
if (states.contains(MaterialState.error)) {
|
|
return _colors.error;
|
|
}
|
|
if (states.contains(MaterialState.selected)) {
|
|
return _colors.primary;
|
|
}
|
|
if (states.contains(MaterialState.pressed)) {
|
|
return _colors.onSurface;
|
|
}
|
|
if (states.contains(MaterialState.hovered)) {
|
|
return _colors.onSurface;
|
|
}
|
|
if (states.contains(MaterialState.focused)) {
|
|
return _colors.onSurface;
|
|
}
|
|
return _colors.onSurfaceVariant;
|
|
});
|
|
}
|
|
|
|
@override
|
|
MaterialStateProperty<Color> get checkColor {
|
|
return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
|
|
if (states.contains(MaterialState.disabled)) {
|
|
if (states.contains(MaterialState.selected)) {
|
|
return _colors.surface;
|
|
}
|
|
return Colors.transparent; // No icons available when the checkbox is unselected.
|
|
}
|
|
if (states.contains(MaterialState.selected)) {
|
|
if (states.contains(MaterialState.error)) {
|
|
return _colors.onError;
|
|
}
|
|
return _colors.onPrimary;
|
|
}
|
|
return Colors.transparent; // No icons available when the checkbox is unselected.
|
|
});
|
|
}
|
|
|
|
@override
|
|
MaterialStateProperty<Color> get overlayColor {
|
|
return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
|
|
if (states.contains(MaterialState.error)) {
|
|
if (states.contains(MaterialState.pressed)) {
|
|
return _colors.error.withOpacity(0.12);
|
|
}
|
|
if (states.contains(MaterialState.hovered)) {
|
|
return _colors.error.withOpacity(0.08);
|
|
}
|
|
if (states.contains(MaterialState.focused)) {
|
|
return _colors.error.withOpacity(0.12);
|
|
}
|
|
}
|
|
if (states.contains(MaterialState.selected)) {
|
|
if (states.contains(MaterialState.pressed)) {
|
|
return _colors.onSurface.withOpacity(0.12);
|
|
}
|
|
if (states.contains(MaterialState.hovered)) {
|
|
return _colors.primary.withOpacity(0.08);
|
|
}
|
|
if (states.contains(MaterialState.focused)) {
|
|
return _colors.primary.withOpacity(0.12);
|
|
}
|
|
return Colors.transparent;
|
|
}
|
|
if (states.contains(MaterialState.pressed)) {
|
|
return _colors.primary.withOpacity(0.12);
|
|
}
|
|
if (states.contains(MaterialState.hovered)) {
|
|
return _colors.onSurface.withOpacity(0.08);
|
|
}
|
|
if (states.contains(MaterialState.focused)) {
|
|
return _colors.onSurface.withOpacity(0.12);
|
|
}
|
|
return Colors.transparent;
|
|
});
|
|
}
|
|
|
|
@override
|
|
double get splashRadius => 40.0 / 2;
|
|
|
|
@override
|
|
MaterialTapTargetSize get materialTapTargetSize => _theme.materialTapTargetSize;
|
|
|
|
@override
|
|
VisualDensity get visualDensity => _theme.visualDensity;
|
|
}
|
|
|
|
// END GENERATED TOKEN PROPERTIES - Checkbox
|