drawer_item.dart 2.29 KB
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// Copyright 2015 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.

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import 'package:flutter/widgets.dart';
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import 'colors.dart';
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import 'icon.dart';
import 'ink_well.dart';
import 'theme.dart';
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class DrawerItem extends StatelessComponent {
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  const DrawerItem({
    Key key,
    this.icon,
    this.child,
    this.onPressed,
    this.selected: false
  }) : super(key: key);
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  final String icon;
  final Widget child;
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  final VoidCallback onPressed;
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  final bool selected;
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  Color _getIconColor(ThemeData themeData) {
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    switch (themeData.brightness) {
      case ThemeBrightness.light:
        if (selected)
          return themeData.primaryColor;
        if (onPressed == null)
          return Colors.black26;
        return Colors.black45;
      case ThemeBrightness.dark:
        if (selected)
          return themeData.accentColor;
        if (onPressed == null)
          return Colors.white30;
        return null; // use default icon theme colour unmodified
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    }
  }

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  TextStyle _getTextStyle(ThemeData themeData) {
    TextStyle result = themeData.text.body2;
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    if (selected) {
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      switch (themeData.brightness) {
        case ThemeBrightness.light:
          return result.copyWith(color: themeData.primaryColor);
        case ThemeBrightness.dark:
          return result.copyWith(color: themeData.accentColor);
      }
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    }
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    return result;
  }

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  Widget build(BuildContext context) {
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    ThemeData themeData = Theme.of(context);
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    List<Widget> children = <Widget>[];
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    if (icon != null) {
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      children.add(
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        new Padding(
          padding: const EdgeDims.symmetric(horizontal: 16.0),
          child: new Icon(
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            icon: icon,
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            color: _getIconColor(themeData)
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          )
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        )
      );
    }
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    children.add(
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      new Flexible(
        child: new Padding(
          padding: const EdgeDims.symmetric(horizontal: 16.0),
          child: new DefaultTextStyle(
            style: _getTextStyle(themeData),
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            child: child
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          )
        )
      )
    );

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    return new MergeSemantics(
      child: new Container(
        height: 48.0,
        child: new InkWell(
          onTap: onPressed,
          child: new Row(children: children)
        )
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      )
    );
  }
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}