// 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:collection';
import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'debug.dart';
import 'feedback.dart';
import 'ink_highlight.dart';
import 'material.dart';
import 'material_state.dart';
import 'theme.dart';
/// An ink feature that displays a [color] "splash" in response to a user
/// gesture that can be confirmed or canceled.
///
/// Subclasses call [confirm] when an input gesture is recognized. For
/// example a press event might trigger an ink feature that's confirmed
/// when the corresponding up event is seen.
///
/// Subclasses call [cancel] when an input gesture is aborted before it
/// is recognized. For example a press event might trigger an ink feature
/// that's canceled when the pointer is dragged out of the reference
/// box.
///
/// The [InkWell] and [InkResponse] widgets generate instances of this
/// class.
abstract class InteractiveInkFeature extends InkFeature {
/// Creates an InteractiveInkFeature.
///
/// The [controller] and [referenceBox] arguments must not be null.
InteractiveInkFeature({
required MaterialInkController controller,
required RenderBox referenceBox,
required Color color,
VoidCallback? onRemoved,
}) : assert(controller != null),
assert(referenceBox != null),
_color = color,
super(controller: controller, referenceBox: referenceBox, onRemoved: onRemoved);
/// Called when the user input that triggered this feature's appearance was confirmed.
///
/// Typically causes the ink to propagate faster across the material. By default this
/// method does nothing.
void confirm() { }
/// Called when the user input that triggered this feature's appearance was canceled.
///
/// Typically causes the ink to gradually disappear. By default this method does
/// nothing.
void cancel() { }
/// The ink's color.
Color get color => _color;
Color _color;
set color(Color value) {
if (value == _color)
return;
_color = value;
controller.markNeedsPaint();
}
/// Draws an ink splash or ink ripple on the passed in [Canvas].
///
/// The [transform] argument is the [Matrix4] transform that typically
/// shifts the coordinate space of the canvas to the space in which
/// the ink circle is to be painted.
///
/// [center] is the [Offset] from origin of the canvas where the center
/// of the circle is drawn.
///
/// [paint] takes a [Paint] object that describes the styles used to draw the ink circle.
/// For example, [paint] can specify properties like color, strokewidth, colorFilter.
///
/// [radius] is the radius of ink circle to be drawn on canvas.
///
/// [clipCallback] is the callback used to obtain the [Rect] used for clipping the ink effect.
/// If [clipCallback] is null, no clipping is performed on the ink circle.
///
/// Clipping can happen in 3 different ways:
/// 1. If [customBorder] is provided, it is used to determine the path
/// for clipping.
/// 2. If [customBorder] is null, and [borderRadius] is provided, the canvas
/// is clipped by an [RRect] created from [clipCallback] and [borderRadius].
/// 3. If [borderRadius] is the default [BorderRadius.zero], then the [Rect] provided
/// by [clipCallback] is used for clipping.
///
/// [textDirection] is used by [customBorder] if it is non-null. This allows the [customBorder]'s path
/// to be properly defined if it was the path was expressed in terms of "start" and "end" instead of
/// "left" and "right".
///
/// For examples on how the function is used, see [InkSplash] and [InkRipple].
@protected
void paintInkCircle({
required Canvas canvas,
required Matrix4 transform,
required Paint paint,
required Offset center,
required double radius,
TextDirection? textDirection,
ShapeBorder? customBorder,
BorderRadius borderRadius = BorderRadius.zero,
RectCallback? clipCallback,
}) {
assert(canvas != null);
assert(transform != null);
assert(paint != null);
assert(center != null);
assert(radius != null);
assert(borderRadius != null);
final Offset? originOffset = MatrixUtils.getAsTranslation(transform);
canvas.save();
if (originOffset == null) {
canvas.transform(transform.storage);
} else {
canvas.translate(originOffset.dx, originOffset.dy);
}
if (clipCallback != null) {
final Rect rect = clipCallback();
if (customBorder != null) {
canvas.clipPath(customBorder.getOuterPath(rect, textDirection: textDirection));
} else if (borderRadius != BorderRadius.zero) {
canvas.clipRRect(RRect.fromRectAndCorners(
rect,
topLeft: borderRadius.topLeft, topRight: borderRadius.topRight,
bottomLeft: borderRadius.bottomLeft, bottomRight: borderRadius.bottomRight,
));
} else {
canvas.clipRect(rect);
}
}
canvas.drawCircle(center, radius, paint);
canvas.restore();
}
}
/// An encapsulation of an [InteractiveInkFeature] constructor used by
/// [InkWell], [InkResponse], and [ThemeData].
///
/// Interactive ink feature implementations should provide a static const
/// `splashFactory` value that's an instance of this class. The `splashFactory`
/// can be used to configure an [InkWell], [InkResponse] or [ThemeData].
///
/// See also:
///
/// * [InkSplash.splashFactory]
/// * [InkRipple.splashFactory]
abstract class InteractiveInkFeatureFactory {
/// Abstract const constructor. This constructor enables subclasses to provide
/// const constructors so that they can be used in const expressions.
///
/// Subclasses should provide a const constructor.
const InteractiveInkFeatureFactory();
/// The factory method.
///
/// Subclasses should override this method to return a new instance of an
/// [InteractiveInkFeature].
@factory
InteractiveInkFeature create({
required MaterialInkController controller,
required RenderBox referenceBox,
required Offset position,
required Color color,
required TextDirection textDirection,
bool containedInkWell = false,
RectCallback? rectCallback,
BorderRadius? borderRadius,
ShapeBorder? customBorder,
double? radius,
VoidCallback? onRemoved,
});
}
abstract class _ParentInkResponseState {
void markChildInkResponsePressed(_ParentInkResponseState childState, bool value);
}
class _ParentInkResponseProvider extends InheritedWidget {
const _ParentInkResponseProvider({
required this.state,
required Widget child,
}) : super(child: child);
final _ParentInkResponseState state;
@override
bool updateShouldNotify(_ParentInkResponseProvider oldWidget) => state != oldWidget.state;
static _ParentInkResponseState? of(BuildContext context) {
return context.dependOnInheritedWidgetOfExactType<_ParentInkResponseProvider>()?.state;
}
}
typedef _GetRectCallback = RectCallback? Function(RenderBox referenceBox);
typedef _CheckContext = bool Function(BuildContext context);
/// An area of a [Material] that responds to touch. Has a configurable shape and
/// can be configured to clip splashes that extend outside its bounds or not.
///
/// For a variant of this widget that is specialized for rectangular areas that
/// always clip splashes, see [InkWell].
///
/// An [InkResponse] widget does two things when responding to a tap:
///
/// * It starts to animate a _highlight_. The shape of the highlight is
/// determined by [highlightShape]. If it is a [BoxShape.circle], the
/// default, then the highlight is a circle of fixed size centered in the
/// [InkResponse]. If it is [BoxShape.rectangle], then the highlight is a box
/// the size of the [InkResponse] itself, unless [getRectCallback] is
/// provided, in which case that callback defines the rectangle. The color of
/// the highlight is set by [highlightColor].
///
/// * Simultaneously, it starts to animate a _splash_. This is a growing circle
/// initially centered on the tap location. If this is a [containedInkWell],
/// the splash grows to the [radius] while remaining centered at the tap
/// location. Otherwise, the splash migrates to the center of the box as it
/// grows.
///
/// The following two diagrams show how [InkResponse] looks when tapped if the
/// [highlightShape] is [BoxShape.circle] (the default) and [containedInkWell]
/// is false (also the default).
///
/// The first diagram shows how it looks if the [InkResponse] is relatively
/// large:
///
/// 
///
/// The second diagram shows how it looks if the [InkResponse] is small:
///
/// 
///
/// The main thing to notice from these diagrams is that the splashes happily
/// exceed the bounds of the widget (because [containedInkWell] is false).
///
/// The following diagram shows the effect when the [InkResponse] has a
/// [highlightShape] of [BoxShape.rectangle] with [containedInkWell] set to
/// true. These are the values used by [InkWell].
///
/// 
///
/// The [InkResponse] widget must have a [Material] widget as an ancestor. The
/// [Material] widget is where the ink reactions are actually painted. This
/// matches the material design premise wherein the [Material] is what is
/// actually reacting to touches by spreading ink.
///
/// If a Widget uses this class directly, it should include the following line
/// at the top of its build function to call [debugCheckHasMaterial]:
///
/// ```dart
/// assert(debugCheckHasMaterial(context));
/// ```
///
/// ## Troubleshooting
///
/// ### The ink splashes aren't visible!
///
/// If there is an opaque graphic, e.g. painted using a [Container], [Image], or
/// [DecoratedBox], between the [Material] widget and the [InkResponse] widget,
/// then the splash won't be visible because it will be under the opaque graphic.
/// This is because ink splashes draw on the underlying [Material] itself, as
/// if the ink was spreading inside the material.
///
/// The [Ink] widget can be used as a replacement for [Image], [Container], or
/// [DecoratedBox] to ensure that the image or decoration also paints in the
/// [Material] itself, below the ink.
///
/// If this is not possible for some reason, e.g. because you are using an
/// opaque [CustomPaint] widget, alternatively consider using a second
/// [Material] above the opaque widget but below the [InkResponse] (as an
/// ancestor to the ink response). The [MaterialType.transparency] material
/// kind can be used for this purpose.
///
/// See also:
///
/// * [GestureDetector], for listening for gestures without ink splashes.
/// * [ElevatedButton] and [TextButton], two kinds of buttons in material design.
/// * [IconButton], which combines [InkResponse] with an [Icon].
class InkResponse extends StatelessWidget {
/// Creates an area of a [Material] that responds to touch.
///
/// Must have an ancestor [Material] widget in which to cause ink reactions.
///
/// The [containedInkWell], [highlightShape], [enableFeedback],
/// and [excludeFromSemantics] arguments must not be null.
const InkResponse({
Key? key,
this.child,
this.onTap,
this.onTapDown,
this.onTapCancel,
this.onDoubleTap,
this.onLongPress,
this.onHighlightChanged,
this.onHover,
this.mouseCursor,
this.containedInkWell = false,
this.highlightShape = BoxShape.circle,
this.radius,
this.borderRadius,
this.customBorder,
this.focusColor,
this.hoverColor,
this.highlightColor,
this.overlayColor,
this.splashColor,
this.splashFactory,
this.enableFeedback = true,
this.excludeFromSemantics = false,
this.focusNode,
this.canRequestFocus = true,
this.onFocusChange,
this.autofocus = false,
}) : assert(containedInkWell != null),
assert(highlightShape != null),
assert(enableFeedback != null),
assert(excludeFromSemantics != null),
assert(autofocus != null),
assert(canRequestFocus != null),
super(key: key);
/// The widget below this widget in the tree.
///
/// {@macro flutter.widgets.ProxyWidget.child}
final Widget? child;
/// Called when the user taps this part of the material.
final GestureTapCallback? onTap;
/// Called when the user taps down this part of the material.
final GestureTapDownCallback? onTapDown;
/// Called when the user cancels a tap that was started on this part of the
/// material.
final GestureTapCallback? onTapCancel;
/// Called when the user double taps this part of the material.
final GestureTapCallback? onDoubleTap;
/// Called when the user long-presses on this part of the material.
final GestureLongPressCallback? onLongPress;
/// Called when this part of the material either becomes highlighted or stops
/// being highlighted.
///
/// The value passed to the callback is true if this part of the material has
/// become highlighted and false if this part of the material has stopped
/// being highlighted.
///
/// If all of [onTap], [onDoubleTap], and [onLongPress] become null while a
/// gesture is ongoing, then [onTapCancel] will be fired and
/// [onHighlightChanged] will be fired with the value false _during the
/// build_. This means, for instance, that in that scenario [State.setState]
/// cannot be called.
final ValueChanged<bool>? onHighlightChanged;
/// Called when a pointer enters or exits the ink response area.
///
/// The value passed to the callback is true if a pointer has entered this
/// part of the material and false if a pointer has exited this part of the
/// material.
final ValueChanged<bool>? onHover;
/// The cursor for a mouse pointer when it enters or is hovering over the
/// widget.
///
/// If [mouseCursor] is a [MaterialStateProperty<MouseCursor>],
/// [MaterialStateProperty.resolve] is used for the following [MaterialState]s:
///
/// * [MaterialState.hovered].
/// * [MaterialState.focused].
/// * [MaterialState.disabled].
///
/// If this property is null, [MaterialStateMouseCursor.clickable] will be used.
final MouseCursor? mouseCursor;
/// Whether this ink response should be clipped its bounds.
///
/// This flag also controls whether the splash migrates to the center of the
/// [InkResponse] or not. If [containedInkWell] is true, the splash remains
/// centered around the tap location. If it is false, the splash migrates to
/// the center of the [InkResponse] as it grows.
///
/// See also:
///
/// * [highlightShape], the shape of the focus, hover, and pressed
/// highlights.
/// * [borderRadius], which controls the corners when the box is a rectangle.
/// * [getRectCallback], which controls the size and position of the box when
/// it is a rectangle.
final bool containedInkWell;
/// The shape (e.g., circle, rectangle) to use for the highlight drawn around
/// this part of the material when pressed, hovered over, or focused.
///
/// The same shape is used for the pressed highlight (see [highlightColor]),
/// the focus highlight (see [focusColor]), and the hover highlight (see
/// [hoverColor]).
///
/// If the shape is [BoxShape.circle], then the highlight is centered on the
/// [InkResponse]. If the shape is [BoxShape.rectangle], then the highlight
/// fills the [InkResponse], or the rectangle provided by [getRectCallback] if
/// the callback is specified.
///
/// See also:
///
/// * [containedInkWell], which controls clipping behavior.
/// * [borderRadius], which controls the corners when the box is a rectangle.
/// * [highlightColor], the color of the highlight.
/// * [getRectCallback], which controls the size and position of the box when
/// it is a rectangle.
final BoxShape highlightShape;
/// The radius of the ink splash.
///
/// Splashes grow up to this size. By default, this size is determined from
/// the size of the rectangle provided by [getRectCallback], or the size of
/// the [InkResponse] itself.
///
/// See also:
///
/// * [splashColor], the color of the splash.
/// * [splashFactory], which defines the appearance of the splash.
final double? radius;
/// The clipping radius of the containing rect. This is effective only if
/// [customBorder] is null.
///
/// If this is null, it is interpreted as [BorderRadius.zero].
final BorderRadius? borderRadius;
/// The custom clip border which overrides [borderRadius].
final ShapeBorder? customBorder;
/// The color of the ink response when the parent widget is focused. If this
/// property is null then the focus color of the theme,
/// [ThemeData.focusColor], will be used.
///
/// See also:
///
/// * [highlightShape], the shape of the focus, hover, and pressed
/// highlights.
/// * [hoverColor], the color of the hover highlight.
/// * [splashColor], the color of the splash.
/// * [splashFactory], which defines the appearance of the splash.
final Color? focusColor;
/// The color of the ink response when a pointer is hovering over it. If this
/// property is null then the hover color of the theme,
/// [ThemeData.hoverColor], will be used.
///
/// See also:
///
/// * [highlightShape], the shape of the focus, hover, and pressed
/// highlights.
/// * [highlightColor], the color of the pressed highlight.
/// * [focusColor], the color of the focus highlight.
/// * [splashColor], the color of the splash.
/// * [splashFactory], which defines the appearance of the splash.
final Color? hoverColor;
/// The highlight color of the ink response when pressed. If this property is
/// null then the highlight color of the theme, [ThemeData.highlightColor],
/// will be used.
///
/// See also:
///
/// * [hoverColor], the color of the hover highlight.
/// * [focusColor], the color of the focus highlight.
/// * [highlightShape], the shape of the focus, hover, and pressed
/// highlights.
/// * [splashColor], the color of the splash.
/// * [splashFactory], which defines the appearance of the splash.
final Color? highlightColor;
/// Defines the ink response focus, hover, and splash colors.
///
/// This default null property can be used as an alternative to
/// [focusColor], [hoverColor], and [splashColor]. If non-null,
/// it is resolved against one of [MaterialState.focused],
/// [MaterialState.hovered], and [MaterialState.pressed]. It's
/// convenient to use when the parent widget can pass along its own
/// MaterialStateProperty value for the overlay color.
///
/// [MaterialState.pressed] triggers a ripple (an ink splash), per
/// the current Material Design spec. The [overlayColor] doesn't map
/// a state to [highlightColor] because a separate highlight is not
/// used by the current design guidelines. See
/// https://material.io/design/interaction/states.html#pressed
///
/// If the overlay color is null or resolves to null, then [focusColor],
/// [hoverColor], [splashColor] and their defaults are used instead.
///
/// See also:
///
/// * The Material Design specification for overlay colors and how they
/// match a component's state:
/// <https://material.io/design/interaction/states.html#anatomy>.
final MaterialStateProperty<Color?>? overlayColor;
/// The splash color of the ink response. If this property is null then the
/// splash color of the theme, [ThemeData.splashColor], will be used.
///
/// See also:
///
/// * [splashFactory], which defines the appearance of the splash.
/// * [radius], the (maximum) size of the ink splash.
/// * [highlightColor], the color of the highlight.
final Color? splashColor;
/// Defines the appearance of the splash.
///
/// Defaults to the value of the theme's splash factory: [ThemeData.splashFactory].
///
/// See also:
///
/// * [radius], the (maximum) size of the ink splash.
/// * [splashColor], the color of the splash.
/// * [highlightColor], the color of the highlight.
/// * [InkSplash.splashFactory], which defines the default splash.
/// * [InkRipple.splashFactory], which defines a splash that spreads out
/// more aggressively than the default.
final InteractiveInkFeatureFactory? splashFactory;
/// Whether detected gestures should provide acoustic and/or haptic feedback.
///
/// For example, on Android a tap will produce a clicking sound and a
/// long-press will produce a short vibration, when feedback is enabled.
///
/// See also:
///
/// * [Feedback] for providing platform-specific feedback to certain actions.
final bool enableFeedback;
/// Whether to exclude the gestures introduced by this widget from the
/// semantics tree.
///
/// For example, a long-press gesture for showing a tooltip is usually
/// excluded because the tooltip itself is included in the semantics
/// tree directly and so having a gesture to show it would result in
/// duplication of information.
final bool excludeFromSemantics;
/// Handler called when the focus changes.
///
/// Called with true if this widget's node gains focus, and false if it loses
/// focus.
final ValueChanged<bool>? onFocusChange;
/// {@macro flutter.widgets.Focus.autofocus}
final bool autofocus;
/// {@macro flutter.widgets.Focus.focusNode}
final FocusNode? focusNode;
/// {@macro flutter.widgets.Focus.canRequestFocus}
final bool canRequestFocus;
/// The rectangle to use for the highlight effect and for clipping
/// the splash effects if [containedInkWell] is true.
///
/// This method is intended to be overridden by descendants that
/// specialize [InkResponse] for unusual cases. For example,
/// [TableRowInkWell] implements this method to return the rectangle
/// corresponding to the row that the widget is in.
///
/// The default behavior returns null, which is equivalent to
/// returning the referenceBox argument's bounding box (though
/// slightly more efficient).
RectCallback? getRectCallback(RenderBox referenceBox) => null;
@override
Widget build(BuildContext context) {
final _ParentInkResponseState? parentState = _ParentInkResponseProvider.of(context);
return _InkResponseStateWidget(
onTap: onTap,
onTapDown: onTapDown,
onTapCancel: onTapCancel,
onDoubleTap: onDoubleTap,
onLongPress: onLongPress,
onHighlightChanged: onHighlightChanged,
onHover: onHover,
mouseCursor: mouseCursor,
containedInkWell: containedInkWell,
highlightShape: highlightShape,
radius: radius,
borderRadius: borderRadius,
customBorder: customBorder,
focusColor: focusColor,
hoverColor: hoverColor,
highlightColor: highlightColor,
overlayColor: overlayColor,
splashColor: splashColor,
splashFactory: splashFactory,
enableFeedback: enableFeedback,
excludeFromSemantics: excludeFromSemantics,
focusNode: focusNode,
canRequestFocus: canRequestFocus,
onFocusChange: onFocusChange,
autofocus: autofocus,
parentState: parentState,
getRectCallback: getRectCallback,
debugCheckContext: debugCheckContext,
child: child,
);
}
/// Asserts that the given context satisfies the prerequisites for
/// this class.
///
/// This method is intended to be overridden by descendants that
/// specialize [InkResponse] for unusual cases. For example,
/// [TableRowInkWell] implements this method to verify that the widget is
/// in a table.
@mustCallSuper
bool debugCheckContext(BuildContext context) {
assert(debugCheckHasMaterial(context));
assert(debugCheckHasDirectionality(context));
return true;
}
}
class _InkResponseStateWidget extends StatefulWidget {
const _InkResponseStateWidget({
this.child,
this.onTap,
this.onTapDown,
this.onTapCancel,
this.onDoubleTap,
this.onLongPress,
this.onHighlightChanged,
this.onHover,
this.mouseCursor,
this.containedInkWell = false,
this.highlightShape = BoxShape.circle,
this.radius,
this.borderRadius,
this.customBorder,
this.focusColor,
this.hoverColor,
this.highlightColor,
this.overlayColor,
this.splashColor,
this.splashFactory,
this.enableFeedback = true,
this.excludeFromSemantics = false,
this.focusNode,
this.canRequestFocus = true,
this.onFocusChange,
this.autofocus = false,
this.parentState,
this.getRectCallback,
required this.debugCheckContext,
}) : assert(containedInkWell != null),
assert(highlightShape != null),
assert(enableFeedback != null),
assert(excludeFromSemantics != null),
assert(autofocus != null),
assert(canRequestFocus != null);
final Widget? child;
final GestureTapCallback? onTap;
final GestureTapDownCallback? onTapDown;
final GestureTapCallback? onTapCancel;
final GestureTapCallback? onDoubleTap;
final GestureLongPressCallback? onLongPress;
final ValueChanged<bool>? onHighlightChanged;
final ValueChanged<bool>? onHover;
final MouseCursor? mouseCursor;
final bool containedInkWell;
final BoxShape highlightShape;
final double? radius;
final BorderRadius? borderRadius;
final ShapeBorder? customBorder;
final Color? focusColor;
final Color? hoverColor;
final Color? highlightColor;
final MaterialStateProperty<Color?>? overlayColor;
final Color? splashColor;
final InteractiveInkFeatureFactory? splashFactory;
final bool enableFeedback;
final bool excludeFromSemantics;
final ValueChanged<bool>? onFocusChange;
final bool autofocus;
final FocusNode? focusNode;
final bool canRequestFocus;
final _ParentInkResponseState? parentState;
final _GetRectCallback? getRectCallback;
final _CheckContext debugCheckContext;
@override
_InkResponseState createState() => _InkResponseState();
@override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
super.debugFillProperties(properties);
final List<String> gestures = <String>[
if (onTap != null) 'tap',
if (onDoubleTap != null) 'double tap',
if (onLongPress != null) 'long press',
if (onTapDown != null) 'tap down',
if (onTapCancel != null) 'tap cancel',
];
properties.add(IterableProperty<String>('gestures', gestures, ifEmpty: '<none>'));
properties.add(DiagnosticsProperty<MouseCursor>('mouseCursor', mouseCursor));
properties.add(DiagnosticsProperty<bool>('containedInkWell', containedInkWell, level: DiagnosticLevel.fine));
properties.add(DiagnosticsProperty<BoxShape>(
'highlightShape',
highlightShape,
description: '${containedInkWell ? "clipped to " : ""}$highlightShape',
showName: false,
));
}
}
/// Used to index the allocated highlights for the different types of highlights
/// in [_InkResponseState].
enum _HighlightType {
pressed,
hover,
focus,
}
class _InkResponseState extends State<_InkResponseStateWidget>
with AutomaticKeepAliveClientMixin<_InkResponseStateWidget>
implements _ParentInkResponseState {
Set<InteractiveInkFeature>? _splashes;
InteractiveInkFeature? _currentSplash;
bool _hovering = false;
final Map<_HighlightType, InkHighlight?> _highlights = <_HighlightType, InkHighlight?>{};
late final Map<Type, Action<Intent>> _actionMap = <Type, Action<Intent>>{
ActivateIntent: CallbackAction<ActivateIntent>(onInvoke: _simulateTap),
ButtonActivateIntent: CallbackAction<ButtonActivateIntent>(onInvoke: _simulateTap),
};
bool get highlightsExist => _highlights.values.where((InkHighlight? highlight) => highlight != null).isNotEmpty;
final ObserverList<_ParentInkResponseState> _activeChildren = ObserverList<_ParentInkResponseState>();
@override
void markChildInkResponsePressed(_ParentInkResponseState childState, bool value) {
assert(childState != null);
final bool lastAnyPressed = _anyChildInkResponsePressed;
if (value) {
_activeChildren.add(childState);
} else {
_activeChildren.remove(childState);
}
final bool nowAnyPressed = _anyChildInkResponsePressed;
if (nowAnyPressed != lastAnyPressed) {
widget.parentState?.markChildInkResponsePressed(this, nowAnyPressed);
}
}
bool get _anyChildInkResponsePressed => _activeChildren.isNotEmpty;
void _simulateTap([Intent? intent]) {
_startSplash(context: context);
_handleTap();
}
void _simulateLongPress() {
_startSplash(context: context);
_handleLongPress();
}
@override
void initState() {
super.initState();
FocusManager.instance.addHighlightModeListener(_handleFocusHighlightModeChange);
}
@override
void didUpdateWidget(_InkResponseStateWidget oldWidget) {
super.didUpdateWidget(oldWidget);
if (_isWidgetEnabled(widget) != _isWidgetEnabled(oldWidget)) {
if (enabled) {
// Don't call widget.onHover because many widgets, including the button
// widgets, apply setState to an ancestor context from onHover.
updateHighlight(_HighlightType.hover, value: _hovering, callOnHover: false);
}
_updateFocusHighlights();
}
}
@override
void dispose() {
FocusManager.instance.removeHighlightModeListener(_handleFocusHighlightModeChange);
super.dispose();
}
@override
bool get wantKeepAlive => highlightsExist || (_splashes != null && _splashes!.isNotEmpty);
Color getHighlightColorForType(_HighlightType type) {
const Set<MaterialState> focused = <MaterialState>{MaterialState.focused};
const Set<MaterialState> hovered = <MaterialState>{MaterialState.hovered};
switch (type) {
// The pressed state triggers a ripple (ink splash), per the current
// Material Design spec. A separate highlight is no longer used.
// See https://material.io/design/interaction/states.html#pressed
case _HighlightType.pressed:
return widget.highlightColor ?? Theme.of(context).highlightColor;
case _HighlightType.focus:
return widget.overlayColor?.resolve(focused) ?? widget.focusColor ?? Theme.of(context).focusColor;
case _HighlightType.hover:
return widget.overlayColor?.resolve(hovered) ?? widget.hoverColor ?? Theme.of(context).hoverColor;
}
}
Duration getFadeDurationForType(_HighlightType type) {
switch (type) {
case _HighlightType.pressed:
return const Duration(milliseconds: 200);
case _HighlightType.hover:
case _HighlightType.focus:
return const Duration(milliseconds: 50);
}
}
void updateHighlight(_HighlightType type, { required bool value, bool callOnHover = true }) {
final InkHighlight? highlight = _highlights[type];
void handleInkRemoval() {
assert(_highlights[type] != null);
_highlights[type] = null;
updateKeepAlive();
}
if (type == _HighlightType.pressed) {
widget.parentState?.markChildInkResponsePressed(this, value);
}
if (value == (highlight != null && highlight.active))
return;
if (value) {
if (highlight == null) {
final RenderBox referenceBox = context.findRenderObject()! as RenderBox;
_highlights[type] = InkHighlight(
controller: Material.of(context)!,
referenceBox: referenceBox,
color: getHighlightColorForType(type),
shape: widget.highlightShape,
radius: widget.radius,
borderRadius: widget.borderRadius,
customBorder: widget.customBorder,
rectCallback: widget.getRectCallback!(referenceBox),
onRemoved: handleInkRemoval,
textDirection: Directionality.of(context),
fadeDuration: getFadeDurationForType(type),
);
updateKeepAlive();
} else {
highlight.activate();
}
} else {
highlight!.deactivate();
}
assert(value == (_highlights[type] != null && _highlights[type]!.active));
switch (type) {
case _HighlightType.pressed:
widget.onHighlightChanged?.call(value);
break;
case _HighlightType.hover:
if (callOnHover)
widget.onHover?.call(value);
break;
case _HighlightType.focus:
break;
}
}
InteractiveInkFeature _createInkFeature(Offset globalPosition) {
final MaterialInkController inkController = Material.of(context)!;
final RenderBox referenceBox = context.findRenderObject()! as RenderBox;
final Offset position = referenceBox.globalToLocal(globalPosition);
const Set<MaterialState> pressed = <MaterialState>{MaterialState.pressed};
final Color color = widget.overlayColor?.resolve(pressed) ?? widget.splashColor ?? Theme.of(context).splashColor;
final RectCallback? rectCallback = widget.containedInkWell ? widget.getRectCallback!(referenceBox) : null;
final BorderRadius? borderRadius = widget.borderRadius;
final ShapeBorder? customBorder = widget.customBorder;
InteractiveInkFeature? splash;
void onRemoved() {
if (_splashes != null) {
assert(_splashes!.contains(splash));
_splashes!.remove(splash);
if (_currentSplash == splash)
_currentSplash = null;
updateKeepAlive();
} // else we're probably in deactivate()
}
splash = (widget.splashFactory ?? Theme.of(context).splashFactory).create(
controller: inkController,
referenceBox: referenceBox,
position: position,
color: color,
containedInkWell: widget.containedInkWell,
rectCallback: rectCallback,
radius: widget.radius,
borderRadius: borderRadius,
customBorder: customBorder,
onRemoved: onRemoved,
textDirection: Directionality.of(context),
);
return splash;
}
void _handleFocusHighlightModeChange(FocusHighlightMode mode) {
if (!mounted) {
return;
}
setState(() {
_updateFocusHighlights();
});
}
bool get _shouldShowFocus {
final NavigationMode mode = MediaQuery.maybeOf(context)?.navigationMode ?? NavigationMode.traditional;
switch (mode) {
case NavigationMode.traditional:
return enabled && _hasFocus;
case NavigationMode.directional:
return _hasFocus;
}
}
void _updateFocusHighlights() {
final bool showFocus;
switch (FocusManager.instance.highlightMode) {
case FocusHighlightMode.touch:
showFocus = false;
break;
case FocusHighlightMode.traditional:
showFocus = _shouldShowFocus;
break;
}
updateHighlight(_HighlightType.focus, value: showFocus);
}
bool _hasFocus = false;
void _handleFocusUpdate(bool hasFocus) {
_hasFocus = hasFocus;
_updateFocusHighlights();
widget.onFocusChange?.call(hasFocus);
}
void _handleTapDown(TapDownDetails details) {
if (_anyChildInkResponsePressed)
return;
_startSplash(details: details);
widget.onTapDown?.call(details);
}
void _startSplash({TapDownDetails? details, BuildContext? context}) {
assert(details != null || context != null);
final Offset globalPosition;
if (context != null) {
final RenderBox referenceBox = context.findRenderObject()! as RenderBox;
assert(referenceBox.hasSize, 'InkResponse must be done with layout before starting a splash.');
globalPosition = referenceBox.localToGlobal(referenceBox.paintBounds.center);
} else {
globalPosition = details!.globalPosition;
}
final InteractiveInkFeature splash = _createInkFeature(globalPosition);
_splashes ??= HashSet<InteractiveInkFeature>();
_splashes!.add(splash);
_currentSplash = splash;
updateKeepAlive();
updateHighlight(_HighlightType.pressed, value: true);
}
void _handleTap() {
_currentSplash?.confirm();
_currentSplash = null;
updateHighlight(_HighlightType.pressed, value: false);
if (widget.onTap != null) {
if (widget.enableFeedback)
Feedback.forTap(context);
widget.onTap?.call();
}
}
void _handleTapCancel() {
_currentSplash?.cancel();
_currentSplash = null;
widget.onTapCancel?.call();
updateHighlight(_HighlightType.pressed, value: false);
}
void _handleDoubleTap() {
_currentSplash?.confirm();
_currentSplash = null;
widget.onDoubleTap?.call();
}
void _handleLongPress() {
_currentSplash?.confirm();
_currentSplash = null;
if (widget.onLongPress != null) {
if (widget.enableFeedback)
Feedback.forLongPress(context);
widget.onLongPress!();
}
}
@override
void deactivate() {
if (_splashes != null) {
final Set<InteractiveInkFeature> splashes = _splashes!;
_splashes = null;
for (final InteractiveInkFeature splash in splashes)
splash.dispose();
_currentSplash = null;
}
assert(_currentSplash == null);
for (final _HighlightType highlight in _highlights.keys) {
_highlights[highlight]?.dispose();
_highlights[highlight] = null;
}
widget.parentState?.markChildInkResponsePressed(this, false);
super.deactivate();
}
bool _isWidgetEnabled(_InkResponseStateWidget widget) {
return widget.onTap != null || widget.onDoubleTap != null || widget.onLongPress != null;
}
bool get enabled => _isWidgetEnabled(widget);
void _handleMouseEnter(PointerEnterEvent event) {
_hovering = true;
if (enabled) {
_handleHoverChange();
}
}
void _handleMouseExit(PointerExitEvent event) {
_hovering = false;
// If the exit occurs after we've been disabled, we still
// want to take down the highlights and run widget.onHover.
_handleHoverChange();
}
void _handleHoverChange() {
updateHighlight(_HighlightType.hover, value: _hovering);
}
bool get _canRequestFocus {
final NavigationMode mode = MediaQuery.maybeOf(context)?.navigationMode ?? NavigationMode.traditional;
switch (mode) {
case NavigationMode.traditional:
return enabled && widget.canRequestFocus;
case NavigationMode.directional:
return true;
}
}
@override
Widget build(BuildContext context) {
assert(widget.debugCheckContext(context));
super.build(context); // See AutomaticKeepAliveClientMixin.
for (final _HighlightType type in _highlights.keys) {
_highlights[type]?.color = getHighlightColorForType(type);
}
const Set<MaterialState> pressed = <MaterialState>{MaterialState.pressed};
_currentSplash?.color = widget.overlayColor?.resolve(pressed) ?? widget.splashColor ?? Theme.of(context).splashColor;
final MouseCursor effectiveMouseCursor = MaterialStateProperty.resolveAs<MouseCursor>(
widget.mouseCursor ?? MaterialStateMouseCursor.clickable,
<MaterialState>{
if (!enabled) MaterialState.disabled,
if (_hovering && enabled) MaterialState.hovered,
if (_hasFocus) MaterialState.focused,
},
);
return _ParentInkResponseProvider(
state: this,
child: Actions(
actions: _actionMap,
child: Focus(
focusNode: widget.focusNode,
canRequestFocus: _canRequestFocus,
onFocusChange: _handleFocusUpdate,
autofocus: widget.autofocus,
child: MouseRegion(
cursor: effectiveMouseCursor,
onEnter: _handleMouseEnter,
onExit: _handleMouseExit,
child: Semantics(
onTap: widget.excludeFromSemantics || widget.onTap == null ? null : _simulateTap,
onLongPress: widget.excludeFromSemantics || widget.onLongPress == null ? null : _simulateLongPress,
child: GestureDetector(
onTapDown: enabled ? _handleTapDown : null,
onTap: enabled ? _handleTap : null,
onTapCancel: enabled ? _handleTapCancel : null,
onDoubleTap: widget.onDoubleTap != null ? _handleDoubleTap : null,
onLongPress: widget.onLongPress != null ? _handleLongPress : null,
behavior: HitTestBehavior.opaque,
excludeFromSemantics: true,
child: widget.child,
),
),
),
),
),
);
}
}
/// A rectangular area of a [Material] that responds to touch.
///
/// For a variant of this widget that does not clip splashes, see [InkResponse].
///
/// The following diagram shows how an [InkWell] looks when tapped, when using
/// default values.
///
/// 
///
/// The [InkWell] widget must have a [Material] widget as an ancestor. The
/// [Material] widget is where the ink reactions are actually painted. This
/// matches the material design premise wherein the [Material] is what is
/// actually reacting to touches by spreading ink.
///
/// If a Widget uses this class directly, it should include the following line
/// at the top of its build function to call [debugCheckHasMaterial]:
///
/// ```dart
/// assert(debugCheckHasMaterial(context));
/// ```
///
/// ## Troubleshooting
///
/// ### The ink splashes aren't visible!
///
/// If there is an opaque graphic, e.g. painted using a [Container], [Image], or
/// [DecoratedBox], between the [Material] widget and the [InkWell] widget, then
/// the splash won't be visible because it will be under the opaque graphic.
/// This is because ink splashes draw on the underlying [Material] itself, as
/// if the ink was spreading inside the material.
///
/// The [Ink] widget can be used as a replacement for [Image], [Container], or
/// [DecoratedBox] to ensure that the image or decoration also paints in the
/// [Material] itself, below the ink.
///
/// If this is not possible for some reason, e.g. because you are using an
/// opaque [CustomPaint] widget, alternatively consider using a second
/// [Material] above the opaque widget but below the [InkWell] (as an
/// ancestor to the ink well). The [MaterialType.transparency] material
/// kind can be used for this purpose.
///
/// ### The ink splashes don't track the size of an animated container
/// If the size of an InkWell's [Material] ancestor changes while the InkWell's
/// splashes are expanding, you may notice that the splashes aren't clipped
/// correctly. This can't be avoided.
///
/// An example of this situation is as follows:
///
/// {@tool dartpad --template=stateful_widget_scaffold_center}
///
/// Tap the container to cause it to grow. Then, tap it again and hold before
/// the widget reaches its maximum size to observe the clipped ink splash.
///
/// ```dart
/// double sideLength = 50;
///
/// @override
/// Widget build(BuildContext context) {
/// return AnimatedContainer(
/// height: sideLength,
/// width: sideLength,
/// duration: const Duration(seconds: 2),
/// curve: Curves.easeIn,
/// child: Material(
/// color: Colors.yellow,
/// child: InkWell(
/// onTap: () {
/// setState(() {
/// sideLength == 50 ? sideLength = 100 : sideLength = 50;
/// });
/// },
/// ),
/// ),
/// );
/// }
/// ```
/// {@end-tool}
///
/// An InkWell's splashes will not properly update to conform to changes if the
/// size of its underlying [Material], where the splashes are rendered, changes
/// during animation. You should avoid using InkWells within [Material] widgets
/// that are changing size.
///
/// See also:
///
/// * [GestureDetector], for listening for gestures without ink splashes.
/// * [ElevatedButton] and [TextButton], two kinds of buttons in material design.
/// * [InkResponse], a variant of [InkWell] that doesn't force a rectangular
/// shape on the ink reaction.
class InkWell extends InkResponse {
/// Creates an ink well.
///
/// Must have an ancestor [Material] widget in which to cause ink reactions.
///
/// The [enableFeedback], and [excludeFromSemantics] arguments
/// must not be null.
const InkWell({
Key? key,
Widget? child,
GestureTapCallback? onTap,
GestureTapCallback? onDoubleTap,
GestureLongPressCallback? onLongPress,
GestureTapDownCallback? onTapDown,
GestureTapCancelCallback? onTapCancel,
ValueChanged<bool>? onHighlightChanged,
ValueChanged<bool>? onHover,
MouseCursor? mouseCursor,
Color? focusColor,
Color? hoverColor,
Color? highlightColor,
MaterialStateProperty<Color?>? overlayColor,
Color? splashColor,
InteractiveInkFeatureFactory? splashFactory,
double? radius,
BorderRadius? borderRadius,
ShapeBorder? customBorder,
bool? enableFeedback = true,
bool excludeFromSemantics = false,
FocusNode? focusNode,
bool canRequestFocus = true,
ValueChanged<bool>? onFocusChange,
bool autofocus = false,
}) : super(
key: key,
child: child,
onTap: onTap,
onDoubleTap: onDoubleTap,
onLongPress: onLongPress,
onTapDown: onTapDown,
onTapCancel: onTapCancel,
onHighlightChanged: onHighlightChanged,
onHover: onHover,
mouseCursor: mouseCursor,
containedInkWell: true,
highlightShape: BoxShape.rectangle,
focusColor: focusColor,
hoverColor: hoverColor,
highlightColor: highlightColor,
overlayColor: overlayColor,
splashColor: splashColor,
splashFactory: splashFactory,
radius: radius,
borderRadius: borderRadius,
customBorder: customBorder,
enableFeedback: enableFeedback ?? true,
excludeFromSemantics: excludeFromSemantics,
focusNode: focusNode,
canRequestFocus: canRequestFocus,
onFocusChange: onFocusChange,
autofocus: autofocus,
);
}