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448 行
16 KiB
448 行
16 KiB
using System;
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using Unity.UIWidgets.animation;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.gestures;
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using Unity.UIWidgets.rendering;
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using Unity.UIWidgets.scheduler;
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using Unity.UIWidgets.ui;
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using Unity.UIWidgets.widgets;
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using UnityEngine;
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using Canvas = Unity.UIWidgets.ui.Canvas;
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using Color = Unity.UIWidgets.ui.Color;
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using Rect = Unity.UIWidgets.ui.Rect;
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namespace Unity.UIWidgets.cupertino {
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class CupertinoSwitchUtils {
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public const float _kTrackWidth = 51.0f;
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public const float _kTrackHeight = 31.0f;
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public const float _kTrackRadius = _kTrackHeight / 2.0f;
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public const float _kTrackInnerStart = _kTrackHeight / 2.0f;
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public const float _kTrackInnerEnd = _kTrackWidth - _kTrackInnerStart;
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public const float _kTrackInnerLength = _kTrackInnerEnd - _kTrackInnerStart;
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public const float _kSwitchWidth = 59.0f;
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public const float _kSwitchHeight = 39.0f;
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public const float _kCupertinoSwitchDisabledOpacity = 0.5f;
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public static readonly Color _kTrackColor = CupertinoColors.lightBackgroundGray;
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public static readonly TimeSpan _kReactionDuration = TimeSpan.FromMilliseconds(300);
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public static readonly TimeSpan _kToggleDuration = TimeSpan.FromMilliseconds(200);
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}
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public class CupertinoSwitch : StatefulWidget {
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public CupertinoSwitch(
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bool value,
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ValueChanged<bool> onChanged,
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Key key = null,
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Color activeColor = null,
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Color trackColor = null,
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DragStartBehavior dragStartBehavior = DragStartBehavior.start
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) : base(key: key) {
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this.value = value;
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this.onChanged = onChanged;
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this.activeColor = activeColor;
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this.trackColor = trackColor;
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this.dragStartBehavior = dragStartBehavior;
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}
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public readonly bool value;
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public readonly ValueChanged<bool> onChanged;
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public readonly Color activeColor;
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public readonly Color trackColor;
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public readonly DragStartBehavior dragStartBehavior;
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public override State createState() {
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return new _CupertinoSwitchState();
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}
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public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
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base.debugFillProperties(properties);
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properties.add(new FlagProperty("value", value: value, ifTrue: "on", ifFalse: "off", showName: true));
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properties.add(new ObjectFlagProperty<ValueChanged<bool>>("onChanged", onChanged, ifNull: "disabled"));
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}
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}
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class _CupertinoSwitchState : TickerProviderStateMixin<CupertinoSwitch> {
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public TapGestureRecognizer _tap;
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public HorizontalDragGestureRecognizer _drag;
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AnimationController _positionController;
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public CurvedAnimation position;
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AnimationController _reactionController;
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public Animation<float> _reaction;
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bool isInteractive {
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get {
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return widget.onChanged != null;
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}
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}
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bool needsPositionAnimation = false;
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public override void initState() {
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base.initState();
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_tap = new TapGestureRecognizer();
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_tap.onTapDown = _handleTapDown;
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_tap.onTapUp = _handleTapUp;
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_tap.onTap = _handleTap;
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_tap.onTapCancel = _handleTapCancel;
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_drag = new HorizontalDragGestureRecognizer();
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_drag.onStart = _handleDragStart;
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_drag.onUpdate = _handleDragUpdate;
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_drag.onEnd = _handleDragEnd;
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_drag.dragStartBehavior = widget.dragStartBehavior;
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_positionController = new AnimationController(
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duration: CupertinoSwitchUtils._kToggleDuration,
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value: widget.value ? 1.0f : 0.0f,
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vsync: this
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);
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position = new CurvedAnimation(
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parent: _positionController,
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curve: Curves.linear
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);
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_reactionController = new AnimationController(
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duration: CupertinoSwitchUtils._kReactionDuration,
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vsync: this
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);
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_reaction = new CurvedAnimation(
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parent: _reactionController,
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curve: Curves.ease
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);
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}
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public override void didUpdateWidget(StatefulWidget oldWidget) {
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oldWidget = (CupertinoSwitch) oldWidget;
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base.didUpdateWidget(oldWidget);
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_drag.dragStartBehavior = widget.dragStartBehavior;
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if (needsPositionAnimation || ((CupertinoSwitch) oldWidget).value != widget.value)
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_resumePositionAnimation(isLinear: needsPositionAnimation);
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}
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void _resumePositionAnimation( bool isLinear = true ) {
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needsPositionAnimation = false;
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position.curve = isLinear ? null : Curves.ease;
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position.reverseCurve = isLinear ? null : Curves.ease.flipped;
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if (widget.value)
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_positionController.forward();
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else
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_positionController.reverse();
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}
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void _handleTapDown(TapDownDetails details) {
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if (isInteractive)
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needsPositionAnimation = false;
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_reactionController.forward();
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}
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void _handleTap() {
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if (isInteractive) {
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widget.onChanged(!widget.value);
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}
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}
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void _handleTapUp(TapUpDetails details) {
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if (isInteractive) {
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needsPositionAnimation = false;
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_reactionController.reverse();
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}
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}
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void _handleTapCancel() {
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if (isInteractive)
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_reactionController.reverse();
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}
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void _handleDragStart(DragStartDetails details) {
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if (isInteractive) {
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needsPositionAnimation = false;
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_reactionController.forward();
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}
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}
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void _handleDragUpdate(DragUpdateDetails details) {
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if (isInteractive) {
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position.curve = null;
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position.reverseCurve = null;
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float? delta = details.primaryDelta / CupertinoSwitchUtils._kTrackInnerLength;
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switch (Directionality.of(context)) {
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case TextDirection.rtl:
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_positionController.setValue( _positionController.value - delta ?? 0.0f);
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break;
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case TextDirection.ltr:
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_positionController.setValue( _positionController.value + delta ?? 0.0f);
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break;
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}
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}
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}
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void _handleDragEnd(DragEndDetails details) {
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setState(()=> { needsPositionAnimation = true; });
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if (position.value >= 0.5 != widget.value)
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widget.onChanged(!widget.value);
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_reactionController.reverse();
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}
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public override Widget build(BuildContext context) {
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if (needsPositionAnimation)
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_resumePositionAnimation();
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return new Opacity(
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opacity: widget.onChanged == null ? CupertinoSwitchUtils._kCupertinoSwitchDisabledOpacity : 1.0f,
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child: new _CupertinoSwitchRenderObjectWidget(
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value: widget.value,
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activeColor: CupertinoDynamicColor.resolve(
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widget.activeColor ?? CupertinoColors.systemGreen,
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context
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),
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trackColor: CupertinoDynamicColor.resolve(widget.trackColor ?? CupertinoColors.secondarySystemFill, context),
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onChanged: widget.onChanged,
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textDirection: Directionality.of(context),
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state: this
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)
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);
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}
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public override void dispose() {
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_tap.dispose();
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_drag.dispose();
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_positionController.dispose();
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_reactionController.dispose();
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base.dispose();
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}
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}
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class _CupertinoSwitchRenderObjectWidget : LeafRenderObjectWidget {
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public _CupertinoSwitchRenderObjectWidget(
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Key key = null,
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bool value = false,
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Color activeColor = null,
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Color trackColor = null,
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ValueChanged<bool> onChanged = null,
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TextDirection? textDirection = null,
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_CupertinoSwitchState state = null
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) : base(key: key) {
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this.value = value;
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this.activeColor = activeColor;
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this.trackColor = trackColor;
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this.onChanged = onChanged;
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this.state = state;
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this.textDirection = textDirection;
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}
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public readonly bool value;
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public readonly Color activeColor;
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public readonly Color trackColor;
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public readonly ValueChanged<bool> onChanged;
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public readonly _CupertinoSwitchState state;
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public readonly TextDirection? textDirection;
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public override RenderObject createRenderObject(BuildContext context) {
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return new _RenderCupertinoSwitch(
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value: value,
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activeColor: activeColor,
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trackColor: trackColor,
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onChanged: onChanged,
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textDirection: textDirection,
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state: state
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);
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}
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public override void updateRenderObject(BuildContext context, RenderObject renderObject) {
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var _renderObject = renderObject as _RenderCupertinoSwitch;
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_renderObject.value = value;
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_renderObject.activeColor = activeColor;
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_renderObject.trackColor = trackColor;
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_renderObject.onChanged = onChanged;
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_renderObject.textDirection = textDirection;
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}
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}
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class _RenderCupertinoSwitch : RenderConstrainedBox {
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public _RenderCupertinoSwitch(
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bool value,
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Color activeColor,
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Color trackColor = null,
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TextDirection? textDirection = null,
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ValueChanged<bool> onChanged = null,
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_CupertinoSwitchState state = null
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) : base(additionalConstraints: BoxConstraints.tightFor(
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width: CupertinoSwitchUtils._kSwitchWidth,
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height: CupertinoSwitchUtils._kSwitchHeight)
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) {
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D.assert(state != null);
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_value = value;
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_activeColor = activeColor;
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_trackColor = trackColor;
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_onChanged = onChanged;
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_textDirection = textDirection;
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_state = state;
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state.position.addListener(markNeedsPaint);
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state._reaction.addListener(markNeedsPaint);
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}
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AnimationController _positionController;
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CurvedAnimation _position;
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AnimationController _reactionController;
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Animation<float> _reaction;
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public readonly _CupertinoSwitchState _state;
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public bool value {
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get { return _value; }
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set {
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D.assert(value != null);
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if (value == _value)
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return;
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_value = value;
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//markNeedsSemanticsUpdate();
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}
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}
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bool _value;
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public Color activeColor {
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get { return _activeColor; }
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set {
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D.assert(value != null);
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if (value == _activeColor) {
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return;
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}
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_activeColor = value;
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markNeedsPaint();
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}
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}
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Color _activeColor;
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public Color trackColor {
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get { return _trackColor; }
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set {
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D.assert(value != null);
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if (value == _trackColor)
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return;
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_trackColor = value;
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markNeedsPaint();
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}
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}
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Color _trackColor;
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public ValueChanged<bool> onChanged {
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get { return _onChanged; }
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set {
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if (value == _onChanged) {
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return;
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}
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bool wasInteractive = isInteractive;
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_onChanged = value;
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if (wasInteractive != isInteractive) {
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markNeedsPaint();
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}
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}
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}
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ValueChanged<bool> _onChanged;
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public TextDirection? textDirection {
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get { return _textDirection; }
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set {
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if (_textDirection == value) {
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return;
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}
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_textDirection = value;
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markNeedsPaint();
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}
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}
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TextDirection? _textDirection;
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public bool isInteractive {
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get { return onChanged != null; }
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}
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protected override bool hitTestSelf(Offset position) {
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return true;
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}
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public override void handleEvent(PointerEvent evt, HitTestEntry entry) {
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D.assert(debugHandleEvent(evt, entry));
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if (evt is PointerDownEvent && isInteractive) {
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_state._drag.addPointer((PointerDownEvent) evt);
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_state._tap.addPointer((PointerDownEvent) evt);
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}
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}
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public override void paint(PaintingContext context, Offset offset) {
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Canvas canvas = context.canvas;
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float currentValue = _state.position.value;
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float currentReactionValue = _state._reaction.value;
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float visualPosition = 0.0f;
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switch (textDirection) {
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case TextDirection.rtl:
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visualPosition = 1.0f - currentValue;
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break;
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case TextDirection.ltr:
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visualPosition = currentValue;
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break;
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}
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Paint paint = new Paint() {color = Color.lerp(trackColor, activeColor, currentValue)};
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Rect trackRect = Rect.fromLTWH(
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offset.dx + (size.width - CupertinoSwitchUtils._kTrackWidth) / 2.0f,
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offset.dy + (size.height - CupertinoSwitchUtils._kTrackHeight) / 2.0f,
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CupertinoSwitchUtils._kTrackWidth,
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CupertinoSwitchUtils._kTrackHeight
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);
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RRect trackRRect = RRect.fromRectAndRadius(trackRect, Radius.circular(CupertinoSwitchUtils._kTrackRadius));
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canvas.drawRRect(trackRRect, paint);
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float currentThumbExtension = CupertinoThumbPainter.extension * currentReactionValue;
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float thumbLeft = MathUtils.lerpNullableFloat(
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trackRect.left + CupertinoSwitchUtils._kTrackInnerStart - CupertinoThumbPainter.radius,
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trackRect.left + CupertinoSwitchUtils._kTrackInnerEnd - CupertinoThumbPainter.radius -
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currentThumbExtension,
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visualPosition
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);
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float thumbRight = MathUtils.lerpNullableFloat(
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trackRect.left + CupertinoSwitchUtils._kTrackInnerStart + CupertinoThumbPainter.radius +
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currentThumbExtension,
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trackRect.left + CupertinoSwitchUtils._kTrackInnerEnd + CupertinoThumbPainter.radius,
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visualPosition
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);
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float thumbCenterY = offset.dy + size.height / 2.0f;
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Rect thumbBounds = Rect.fromLTRB(
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thumbLeft,
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thumbCenterY - CupertinoThumbPainter.radius,
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thumbRight,
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thumbCenterY + CupertinoThumbPainter.radius
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);
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context.pushClipRRect(needsCompositing, Offset.zero, thumbBounds, trackRRect,
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(PaintingContext innerContext, Offset offset1) => {
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CupertinoThumbPainter.switchThumb().paint(innerContext.canvas, thumbBounds);
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});
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}
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public override void debugFillProperties(DiagnosticPropertiesBuilder description) {
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base.debugFillProperties(description);
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description.add(
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new FlagProperty("value", value: value, ifTrue: "checked", ifFalse: "unchecked", showName: true));
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description.add(new FlagProperty("isInteractive", value: isInteractive, ifTrue: "enabled",
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ifFalse: "disabled",
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showName: true, defaultValue: true));
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}
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}
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}
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