// 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 '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 [clipBehavior] argument must not be null. const MaterialButton({ Key key, @required this.onPressed, this.onHighlightChanged, this.textTheme, this.textColor, this.disabledTextColor, this.color, this.disabledColor, this.highlightColor, this.splashColor, this.colorBrightness, this.elevation, this.highlightElevation, this.disabledElevation, this.padding, this.shape, this.clipBehavior = Clip.none, this.materialTapTargetSize, this.animationDuration, this.minWidth, this.height, this.child, }) : 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. 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]. /// /// 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]. /// /// 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 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. This controls the size of /// the shadow below the raised button. /// /// Defaults to 2, the appropriate elevation for raised buttons. /// /// See also: /// /// * [FlatButton], a button with no elevation or fill color. /// * [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 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. /// /// See also: /// /// * [elevation], the default elevation. /// * [disabledElevation], the elevation when the button is disabled. final double highlightElevation; /// The elevation for the button's [Material] when the button /// is not [enabled]. /// /// Defaults to 0.0. /// /// 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, [ThemeData.brightness]. 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. final ShapeBorder shape; /// {@macro flutter.widgets.Clip} final Clip clipBehavior; /// 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, fillColor: color, textStyle: theme.textTheme.button.copyWith(color: buttonTheme.getTextColor(this)), highlightColor: highlightColor ?? theme.highlightColor, splashColor: splashColor ?? theme.splashColor, elevation: buttonTheme.getElevation(this), highlightElevation: buttonTheme.getHighlightElevation(this), padding: buttonTheme.getPadding(this), constraints: buttonTheme.getConstraints(this).copyWith( minWidth: minWidth, minHeight: height, ), shape: buttonTheme.shape, clipBehavior: clipBehavior ?? Clip.none, animationDuration: buttonTheme.getAnimationDuration(this), child: child, materialTapTargetSize: materialTapTargetSize ?? theme.materialTapTargetSize, ); } @override void debugFillProperties(DiagnosticPropertiesBuilder properties) { super.debugFillProperties(properties); properties.add(FlagProperty('enabled', value: enabled, ifFalse: 'disabled')); } } /// 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 { }