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// Copyright 2018 The Chromium 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:ui';
import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'button.dart';
import 'button_theme.dart';
import 'constants.dart';
import 'ink_well.dart';
import 'material.dart';
import 'theme.dart';
import 'theme_data.dart';
/// A utility class for building Material buttons that depend on the
/// ambient [ButtonTheme] and [Theme].
///
/// The button's size will expand to fit the child widget, if necessary.
///
/// MaterialButtons whose [onPressed] handler is null will be disabled. To have
/// an enabled button, make sure to pass a non-null value for onPressed.
///
/// Rather than using this class directly, consider using [FlatButton],
/// [OutlineButton], or [RaisedButton], which configure this class with
/// appropriate defaults that match the material design specification.
///
/// To create a button directly, without inheriting theme defaults, use
/// [RawMaterialButton].
///
/// If you want an ink-splash effect for taps, but don't want to use a button,
/// consider using [InkWell] directly.
///
/// See also:
///
/// * [IconButton], to create buttons that contain icons rather than text.
class MaterialButton extends StatelessWidget {
/// Creates a material button.
///
/// Rather than creating a material button directly, consider using
/// [FlatButton] or [RaisedButton]. To create a custom Material button
/// consider using [RawMaterialButton].
///
/// The [autofocus] and [clipBehavior] arguments must not be null.
/// Additionally, [elevation], [hoverElevation], [focusElevation],
/// [highlightElevation], and [disabledElevation] must be non-negative, if
/// specified.
const MaterialButton({
Key key,
@required this.onPressed,
this.onHighlightChanged,
this.textTheme,
this.textColor,
this.disabledTextColor,
this.color,
this.disabledColor,
this.focusColor,
this.hoverColor,
this.highlightColor,
this.splashColor,
this.colorBrightness,
this.elevation,
this.focusElevation,
this.hoverElevation,
this.highlightElevation,
this.disabledElevation,
this.padding,
this.shape,
this.clipBehavior = Clip.none,
this.focusNode,
this.autofocus = false,
this.materialTapTargetSize,
this.animationDuration,
this.minWidth,
this.height,
this.child,
}) : assert(clipBehavior != null),
assert(autofocus != null),
assert(elevation == null || elevation >= 0.0),
assert(focusElevation == null || focusElevation >= 0.0),
assert(hoverElevation == null || hoverElevation >= 0.0),
assert(highlightElevation == null || highlightElevation >= 0.0),
assert(disabledElevation == null || disabledElevation >= 0.0),
super(key: key);
/// The callback that is called when the button is tapped or otherwise activated.
///
/// If this is set to null, the button will be disabled.
final VoidCallback onPressed;
/// Called by the underlying [InkWell] widget's [InkWell.onHighlightChanged]
/// callback.
///
/// If [onPressed] changes from null to non-null while a gesture is ongoing,
/// this can fire during the build phase (in which case calling
/// [State.setState] is not allowed).
final ValueChanged<bool> onHighlightChanged;
/// Defines the button's base colors, and the defaults for the button's minimum
/// size, internal padding, and shape.
///
/// Defaults to `ButtonTheme.of(context).textTheme`.
final ButtonTextTheme textTheme;
/// The color to use for this button's text.
///
/// The button's [Material.textStyle] will be the current theme's button
/// text style, [ThemeData.textTheme.button], configured with this color.
///
/// The default text color depends on the button theme's text theme,
/// [ButtonThemeData.textTheme].
///
/// If [textColor] is a [MaterialStateProperty<Color>], [disabledTextColor]
/// will be ignored.
///
/// See also:
///
/// * [disabledTextColor], the text color to use when the button has been
/// disabled.
final Color textColor;
/// The color to use for this button's text when the button is disabled.
///
/// The button's [Material.textStyle] will be the current theme's button
/// text style, [ThemeData.textTheme.button], configured with this color.
///
/// The default value is the theme's disabled color,
/// [ThemeData.disabledColor].
///
/// If [textColor] is a [MaterialStateProperty<Color>], [disabledTextColor]
/// will be ignored.
///
/// See also:
///
/// * [textColor] - The color to use for this button's text when the button is [enabled].
final Color disabledTextColor;
/// The button's fill color, displayed by its [Material], while it
/// is in its default (unpressed, [enabled]) state.
///
/// The default fill color is the theme's button color, [ThemeData.buttonColor].
///
/// See also:
///
/// * [disabledColor] - the fill color of the button when the button is disabled.
final Color color;
/// The fill color of the button when the button is disabled.
///
/// The default value of this color is the theme's disabled color,
/// [ThemeData.disabledColor].
///
/// See also:
///
/// * [color] - the fill color of the button when the button is [enabled].
final Color disabledColor;
/// The splash color of the button's [InkWell].
///
/// The ink splash indicates that the button has been touched. It
/// appears on top of the button's child and spreads in an expanding
/// circle beginning where the touch occurred.
///
/// The default splash color is the current theme's splash color,
/// [ThemeData.splashColor].
///
/// The appearance of the splash can be configured with the theme's splash
/// factory, [ThemeData.splashFactory].
final Color splashColor;
/// The fill color of the button's [Material] when it has the input focus.
///
/// The button changed focus color when the button has the input focus. It
/// appears behind the button's child.
final Color focusColor;
/// The fill color of the button's [Material] when a pointer is hovering over
/// it.
///
/// The button changes fill color when a pointer is hovering over the button.
/// It appears behind the button's child.
final Color hoverColor;
/// The highlight color of the button's [InkWell].
///
/// The highlight indicates that the button is actively being pressed. It
/// appears on top of the button's child and quickly spreads to fill
/// the button, and then fades out.
///
/// If [textTheme] is [ButtonTextTheme.primary], the default highlight color is
/// transparent (in other words the highlight doesn't appear). Otherwise it's
/// the current theme's highlight color, [ThemeData.highlightColor].
final Color highlightColor;
/// The z-coordinate at which to place this button relative to its parent.
///
/// This controls the size of the shadow below the raised button.
///
/// Defaults to 2, the appropriate elevation for raised buttons. The value
/// is always non-negative.
///
/// See also:
///
/// * [FlatButton], a button with no elevation or fill color.
/// * [focusElevation], the elevation when the button is focused.
/// * [hoverElevation], the elevation when a pointer is hovering over the
/// button.
/// * [disabledElevation], the elevation when the button is disabled.
/// * [highlightElevation], the elevation when the button is pressed.
final double elevation;
/// The elevation for the button's [Material] when the button
/// is [enabled] and a pointer is hovering over it.
///
/// Defaults to 4.0. The value is always non-negative.
///
/// See also:
///
/// * [elevation], the default elevation.
/// * [focusElevation], the elevation when the button is focused.
/// * [disabledElevation], the elevation when the button is disabled.
/// * [highlightElevation], the elevation when the button is pressed.
final double hoverElevation;
/// The elevation for the button's [Material] when the button
/// is [enabled] and has the input focus.
///
/// Defaults to 4.0. The value is always non-negative.
///
/// See also:
///
/// * [elevation], the default elevation.
/// * [hoverElevation], the elevation when a pointer is hovering over the
/// button.
/// * [disabledElevation], the elevation when the button is disabled.
/// * [highlightElevation], the elevation when the button is pressed.
final double focusElevation;
/// The elevation for the button's [Material] relative to its parent when the
/// button is [enabled] and pressed.
///
/// This controls the size of the shadow below the button. When a tap
/// down gesture occurs within the button, its [InkWell] displays a
/// [highlightColor] "highlight".
///
/// Defaults to 8.0. The value is always non-negative.
///
/// See also:
///
/// * [elevation], the default elevation.
/// * [focusElevation], the elevation when the button is focused.
/// * [hoverElevation], the elevation when a pointer is hovering over the
/// button.
/// * [disabledElevation], the elevation when the button is disabled.
final double highlightElevation;
/// The elevation for the button's [Material] relative to its parent when the
/// button is not [enabled].
///
/// Defaults to 0.0. The value is always non-negative.
///
/// See also:
///
/// * [elevation], the default elevation.
/// * [highlightElevation], the elevation when the button is pressed.
final double disabledElevation;
/// The theme brightness to use for this button.
///
/// Defaults to the theme's brightness in [ThemeData.brightness]. Setting
/// this value determines the button text's colors based on
/// [ButtonThemeData.getTextColor].
///
/// See also:
///
/// * [ButtonTextTheme], uses [Brightness] to determine text color.
final Brightness colorBrightness;
/// The button's label.
///
/// Often a [Text] widget in all caps.
final Widget child;
/// Whether the button is enabled or disabled.
///
/// Buttons are disabled by default. To enable a button, set its [onPressed]
/// property to a non-null value.
bool get enabled => onPressed != null;
/// The internal padding for the button's [child].
///
/// Defaults to the value from the current [ButtonTheme],
/// [ButtonThemeData.padding].
final EdgeInsetsGeometry padding;
/// The shape of the button's [Material].
///
/// The button's highlight and splash are clipped to this shape. If the
/// button has an elevation, then its drop shadow is defined by this
/// shape as well.
///
/// Defaults to the value from the current [ButtonTheme],
/// [ButtonThemeData.shape].
final ShapeBorder shape;
/// {@macro flutter.widgets.Clip}
///
/// Defaults to [Clip.none], and must not be null.
final Clip clipBehavior;
/// {@macro flutter.widgets.Focus.focusNode}
final FocusNode focusNode;
/// {@macro flutter.widgets.Focus.autofocus}
final bool autofocus;
/// Defines the duration of animated changes for [shape] and [elevation].
///
/// The default value is [kThemeChangeDuration].
final Duration animationDuration;
/// Configures the minimum size of the tap target.
///
/// Defaults to [ThemeData.materialTapTargetSize].
///
/// See also:
///
/// * [MaterialTapTargetSize], for a description of how this affects tap targets.
final MaterialTapTargetSize materialTapTargetSize;
/// The smallest horizontal extent that the button will occupy.
///
/// Defaults to the value from the current [ButtonTheme].
final double minWidth;
/// The vertical extent of the button.
///
/// Defaults to the value from the current [ButtonTheme].
final double height;
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
final ButtonThemeData buttonTheme = ButtonTheme.of(context);
return RawMaterialButton(
onPressed: onPressed,
onHighlightChanged: onHighlightChanged,
fillColor: buttonTheme.getFillColor(this),
textStyle: theme.textTheme.button.copyWith(color: buttonTheme.getTextColor(this)),
focusColor: focusColor ?? buttonTheme.getFocusColor(this) ?? theme.focusColor,
hoverColor: hoverColor ?? buttonTheme.getHoverColor(this) ?? theme.hoverColor,
highlightColor: highlightColor ?? theme.highlightColor,
splashColor: splashColor ?? theme.splashColor,
elevation: buttonTheme.getElevation(this),
focusElevation: buttonTheme.getFocusElevation(this),
hoverElevation: buttonTheme.getHoverElevation(this),
highlightElevation: buttonTheme.getHighlightElevation(this),
padding: buttonTheme.getPadding(this),
constraints: buttonTheme.getConstraints(this).copyWith(
minWidth: minWidth,
minHeight: height,
),
shape: buttonTheme.getShape(this),
clipBehavior: clipBehavior,
focusNode: focusNode,
animationDuration: buttonTheme.getAnimationDuration(this),
child: child,
materialTapTargetSize: materialTapTargetSize ?? theme.materialTapTargetSize,
);
}
@override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
super.debugFillProperties(properties);
properties.add(ObjectFlagProperty<VoidCallback>('onPressed', onPressed, ifNull: 'disabled'));
properties.add(DiagnosticsProperty<ButtonTextTheme>('textTheme', textTheme, defaultValue: null));
properties.add(ColorProperty('textColor', textColor, defaultValue: null));
properties.add(ColorProperty('disabledTextColor', disabledTextColor, defaultValue: null));
properties.add(ColorProperty('color', color, defaultValue: null));
properties.add(ColorProperty('disabledColor', disabledColor, defaultValue: null));
properties.add(ColorProperty('focusColor', focusColor, defaultValue: null));
properties.add(ColorProperty('hoverColor', hoverColor, defaultValue: null));
properties.add(ColorProperty('highlightColor', highlightColor, defaultValue: null));
properties.add(ColorProperty('splashColor', splashColor, defaultValue: null));
properties.add(DiagnosticsProperty<Brightness>('colorBrightness', colorBrightness, defaultValue: null));
properties.add(DiagnosticsProperty<EdgeInsetsGeometry>('padding', padding, defaultValue: null));
properties.add(DiagnosticsProperty<ShapeBorder>('shape', shape, defaultValue: null));
properties.add(DiagnosticsProperty<FocusNode>('focusNode', focusNode, defaultValue: null));
properties.add(DiagnosticsProperty<MaterialTapTargetSize>('materialTapTargetSize', materialTapTargetSize, defaultValue: null));
}
}
/// The type of [MaterialButton]s created with [RaisedButton.icon], [FlatButton.icon],
/// and [OutlineButton.icon].
///
/// This mixin only exists to give the "label and icon" button widgets a distinct
/// type for the sake of [ButtonTheme].
mixin MaterialButtonWithIconMixin { }