examples/flutter_gallery/lib/gallery/drawer.dart - mirrors/flutter - Git at Google

 // Copyright 2016 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:math' as math;

 import 'package:flutter/foundation.dart' show defaultTargetPlatform, required;
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';

 import 'package:url_launcher/url_launcher.dart';

 import 'theme.dart';

 class LinkTextSpan extends TextSpan {

   // Beware!
   //
   // This class is only safe because the TapGestureRecognizer is not
   // given a deadline and therefore never allocates any resources.
   //
   // In any other situation -- setting a deadline, using any of the less trivial
   // recognizers, etc -- you would have to manage the gesture recognizer's
   // lifetime and call dispose() when the TextSpan was no longer being rendered.
   //
   // Since TextSpan itself is @immutable, this means that you would have to
   // manage the recognizer from outside the TextSpan, e.g. in the State of a
   // stateful widget that then hands the recognizer to the TextSpan.

   LinkTextSpan({ TextStyle style, String url, String text }) : super(
     style: style,
     text: text ?? url,
     recognizer: new TapGestureRecognizer()..onTap = () {
       launch(url);
     }
   );
 }

 class GalleryDrawerHeader extends StatefulWidget {
   const GalleryDrawerHeader({ Key key, this.light }) : super(key: key);

   final bool light;

   @override
   _GalleryDrawerHeaderState createState() => new _GalleryDrawerHeaderState();
 }

 class _GalleryDrawerHeaderState extends State<GalleryDrawerHeader> {
   bool _logoHasName = true;
   bool _logoHorizontal = true;
   MaterialColor _logoColor = Colors.blue;

   @override
   Widget build(BuildContext context) {
     final double systemTopPadding = MediaQuery.of(context).padding.top;

     return new Semantics(
       label: 'Flutter',
       child: new DrawerHeader(
         decoration: new FlutterLogoDecoration(
           margin: new EdgeInsets.fromLTRB(12.0, 12.0 + systemTopPadding, 12.0, 12.0),
           style: _logoHasName ? _logoHorizontal ? FlutterLogoStyle.horizontal
                                                 : FlutterLogoStyle.stacked
                                                 : FlutterLogoStyle.markOnly,
           lightColor: _logoColor.shade400,
           darkColor: _logoColor.shade900,
           textColor: widget.light ? const Color(0xFF616161) : const Color(0xFF9E9E9E),
         ),
         duration: const Duration(milliseconds: 750),
         child: new GestureDetector(
           onLongPress: () {
             setState(() {
               _logoHorizontal = !_logoHorizontal;
               if (!_logoHasName)
                 _logoHasName = true;
             });
           },
           onTap: () {
             setState(() {
               _logoHasName = !_logoHasName;
             });
           },
           onDoubleTap: () {
             setState(() {
               final List<MaterialColor> options = <MaterialColor>[];
               if (_logoColor != Colors.blue)
                 options.addAll(<MaterialColor>[Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue]);
               if (_logoColor != Colors.amber)
                 options.addAll(<MaterialColor>[Colors.amber, Colors.amber, Colors.amber]);
               if (_logoColor != Colors.red)
                 options.addAll(<MaterialColor>[Colors.red, Colors.red, Colors.red]);
               if (_logoColor != Colors.indigo)
                 options.addAll(<MaterialColor>[Colors.indigo, Colors.indigo, Colors.indigo]);
               if (_logoColor != Colors.pink)
                 options.addAll(<MaterialColor>[Colors.pink]);
               if (_logoColor != Colors.purple)
                 options.addAll(<MaterialColor>[Colors.purple]);
               if (_logoColor != Colors.cyan)
                 options.addAll(<MaterialColor>[Colors.cyan]);
               _logoColor = options[new math.Random().nextInt(options.length)];
             });
           }
         ),
       ),
     );
   }
 }

 class GalleryDrawer extends StatelessWidget {
   const GalleryDrawer({
     Key key,
     this.galleryTheme,
     @required this.onThemeChanged,
     this.timeDilation,
     @required this.onTimeDilationChanged,
     this.textScaleFactor,
     this.onTextScaleFactorChanged,
     this.showPerformanceOverlay,
     this.onShowPerformanceOverlayChanged,
     this.checkerboardRasterCacheImages,
     this.onCheckerboardRasterCacheImagesChanged,
     this.checkerboardOffscreenLayers,
     this.onCheckerboardOffscreenLayersChanged,
     this.onPlatformChanged,
     this.overrideDirection: TextDirection.ltr,
     this.onOverrideDirectionChanged,
     this.onSendFeedback,
   }) : assert(onThemeChanged != null),
        assert(onTimeDilationChanged != null),
        super(key: key);

   final GalleryTheme galleryTheme;
   final ValueChanged<GalleryTheme> onThemeChanged;

   final double timeDilation;
   final ValueChanged<double> onTimeDilationChanged;

   final double textScaleFactor;
   final ValueChanged<double> onTextScaleFactorChanged;

   final bool showPerformanceOverlay;
   final ValueChanged<bool> onShowPerformanceOverlayChanged;

   final bool checkerboardRasterCacheImages;
   final ValueChanged<bool> onCheckerboardRasterCacheImagesChanged;

   final bool checkerboardOffscreenLayers;
   final ValueChanged<bool> onCheckerboardOffscreenLayersChanged;

   final ValueChanged<TargetPlatform> onPlatformChanged;

   final TextDirection overrideDirection;
   final ValueChanged<TextDirection> onOverrideDirectionChanged;

   final VoidCallback onSendFeedback;

   @override
   Widget build(BuildContext context) {
     final ThemeData themeData = Theme.of(context);
     final TextStyle aboutTextStyle = themeData.textTheme.body2;
     final TextStyle linkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);

     final List<Widget> themeItems = kAllGalleryThemes.map<Widget>((GalleryTheme theme) {
       return new RadioListTile<GalleryTheme>(
         title: new Text(theme.name),
         secondary: new Icon(theme.icon),
         value: theme,
         groupValue: galleryTheme,
         onChanged: onThemeChanged,
         selected: galleryTheme == theme,
       );
     }).toList();

     final Widget mountainViewItem = new RadioListTile<TargetPlatform>(
       // on iOS, we don't want to show an Android phone icon
       secondary: new Icon(defaultTargetPlatform == TargetPlatform.iOS ? Icons.star : Icons.phone_android),
       title: new Text(defaultTargetPlatform == TargetPlatform.iOS ? 'Mountain View' : 'Android'),
       value: TargetPlatform.android,
       groupValue: Theme.of(context).platform,
       onChanged: onPlatformChanged,
       selected: Theme.of(context).platform == TargetPlatform.android,
     );

     final Widget cupertinoItem = new RadioListTile<TargetPlatform>(
       // on iOS, we don't want to show the iPhone icon
       secondary: new Icon(defaultTargetPlatform == TargetPlatform.iOS ? Icons.star_border : Icons.phone_iphone),
       title: new Text(defaultTargetPlatform == TargetPlatform.iOS ? 'Cupertino' : 'iOS'),
       value: TargetPlatform.iOS,
       groupValue: Theme.of(context).platform,
       onChanged: onPlatformChanged,
       selected: Theme.of(context).platform == TargetPlatform.iOS,
     );

     final List<Widget> textSizeItems = <Widget>[];
     final Map<double, String> textSizes = <double, String>{
       null: 'System Default',
       0.8: 'Small',
       1.0: 'Normal',
       1.3: 'Large',
       2.0: 'Huge',
     };
     for (double size in textSizes.keys) {
       textSizeItems.add(new RadioListTile<double>(
         secondary: const Icon(Icons.text_fields),
         title: new Text(textSizes[size]),
         value: size,
         groupValue: textScaleFactor,
         onChanged: onTextScaleFactorChanged,
         selected: textScaleFactor == size,
       ));
     }

     final Widget animateSlowlyItem = new CheckboxListTile(
       title: const Text('Animate Slowly'),
       value: timeDilation != 1.0,
       onChanged: (bool value) {
         onTimeDilationChanged(value ? 20.0 : 1.0);
       },
       secondary: const Icon(Icons.hourglass_empty),
       selected: timeDilation != 1.0,
     );

     final Widget overrideDirectionItem = new CheckboxListTile(
       title: const Text('Force RTL'),
       value: overrideDirection == TextDirection.rtl,
       onChanged: (bool value) {
         onOverrideDirectionChanged(value ? TextDirection.rtl : TextDirection.ltr);
       },
       secondary: const Icon(Icons.format_textdirection_r_to_l),
       selected: overrideDirection == TextDirection.rtl,
     );

     final Widget sendFeedbackItem = new ListTile(
       leading: const Icon(Icons.report),
       title: const Text('Send feedback'),
       onTap: onSendFeedback ?? () {
         launch('https://github.com/flutter/flutter/issues/new');
       },
     );

     final Widget aboutItem = new AboutListTile(
       icon: const FlutterLogo(),
       applicationVersion: 'April 2017 Preview',
       applicationIcon: const FlutterLogo(),
       applicationLegalese: '© 2017 The Chromium Authors',
       aboutBoxChildren: <Widget>[
         new Padding(
           padding: const EdgeInsets.only(top: 24.0),
           child: new RichText(
             text: new TextSpan(
               children: <TextSpan>[
                 new TextSpan(
                   style: aboutTextStyle,
                   text: 'Flutter is an early-stage, open-source project to help developers'
                         'build high-performance, high-fidelity, mobile apps for '
                         '${defaultTargetPlatform == TargetPlatform.iOS ? 'multiple platforms' : 'iOS and Android'} '
                         'from a single codebase. This gallery is a preview of '
                         "Flutter's many widgets, behaviors, animations, layouts, "
                         'and more. Learn more about Flutter at '
                 ),
                 new LinkTextSpan(
                   style: linkStyle,
                   url: 'https://flutter.io'
                 ),
                 new TextSpan(
                   style: aboutTextStyle,
                   text: '.\n\nTo see the source code for this app, please visit the '
                 ),
                 new LinkTextSpan(
                   style: linkStyle,
                   url: 'https://goo.gl/iv1p4G',
                   text: 'flutter github repo'
                 ),
                 new TextSpan(
                   style: aboutTextStyle,
                   text: '.'
                 )
               ]
             )
           )
         )
       ]
     );

     final List<Widget> allDrawerItems = <Widget>[
       new GalleryDrawerHeader(
         light: galleryTheme.theme.brightness == Brightness.light,
       ),
     ]
     ..addAll(themeItems)
     ..addAll(<Widget>[
       const Divider(),
       mountainViewItem,
       cupertinoItem,
       const Divider(),
     ])
     ..addAll(textSizeItems)
     ..addAll(<Widget>[
       overrideDirectionItem,
       const Divider(),
       animateSlowlyItem,
       const Divider(),
     ]);

     bool addedOptionalItem = false;
     if (onCheckerboardOffscreenLayersChanged != null) {
       allDrawerItems.add(new CheckboxListTile(
         title: const Text('Checkerboard Offscreen Layers'),
         value: checkerboardOffscreenLayers,
         onChanged: onCheckerboardOffscreenLayersChanged,
         secondary: const Icon(Icons.assessment),
         selected: checkerboardOffscreenLayers,
       ));
       addedOptionalItem = true;
     }

     if (onCheckerboardRasterCacheImagesChanged != null) {
       allDrawerItems.add(new CheckboxListTile(
         title: const Text('Checkerboard Raster Cache Images'),
         value: checkerboardRasterCacheImages,
         onChanged: onCheckerboardRasterCacheImagesChanged,
         secondary: const Icon(Icons.assessment),
         selected: checkerboardRasterCacheImages,
       ));
       addedOptionalItem = true;
     }

     if (onShowPerformanceOverlayChanged != null) {
       allDrawerItems.add(new CheckboxListTile(
         title: const Text('Performance Overlay'),
         value: showPerformanceOverlay,
         onChanged: onShowPerformanceOverlayChanged,
         secondary: const Icon(Icons.assessment),
         selected: showPerformanceOverlay,
       ));
       addedOptionalItem = true;
     }

     if (addedOptionalItem)
       allDrawerItems.add(const Divider());

     allDrawerItems.addAll(<Widget>[
       sendFeedbackItem,
       aboutItem,
     ]);

     return new Drawer(child: new ListView(primary: false, children: allDrawerItems));
   }
 }
	// Copyright 2016 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:math' as math;

	import 'package:flutter/foundation.dart' show defaultTargetPlatform, required;
	import 'package:flutter/gestures.dart';
	import 'package:flutter/material.dart';

	import 'package:url_launcher/url_launcher.dart';

	import 'theme.dart';

	class LinkTextSpan extends TextSpan {

	// Beware!
	//
	// This class is only safe because the TapGestureRecognizer is not
	// given a deadline and therefore never allocates any resources.
	//
	// In any other situation -- setting a deadline, using any of the less trivial
	// recognizers, etc -- you would have to manage the gesture recognizer's
	// lifetime and call dispose() when the TextSpan was no longer being rendered.
	//
	// Since TextSpan itself is @immutable, this means that you would have to
	// manage the recognizer from outside the TextSpan, e.g. in the State of a
	// stateful widget that then hands the recognizer to the TextSpan.

	LinkTextSpan({ TextStyle style, String url, String text }) : super(
	style: style,
	text: text ?? url,
	recognizer: new TapGestureRecognizer()..onTap = () {
	launch(url);
	}
	);
	}

	class GalleryDrawerHeader extends StatefulWidget {
	const GalleryDrawerHeader({ Key key, this.light }) : super(key: key);

	final bool light;

	@override
	_GalleryDrawerHeaderState createState() => new _GalleryDrawerHeaderState();
	}

	class _GalleryDrawerHeaderState extends State<GalleryDrawerHeader> {
	bool _logoHasName = true;
	bool _logoHorizontal = true;
	MaterialColor _logoColor = Colors.blue;

	@override
	Widget build(BuildContext context) {
	final double systemTopPadding = MediaQuery.of(context).padding.top;

	return new Semantics(
	label: 'Flutter',
	child: new DrawerHeader(
	decoration: new FlutterLogoDecoration(
	margin: new EdgeInsets.fromLTRB(12.0, 12.0 + systemTopPadding, 12.0, 12.0),
	style: _logoHasName ? _logoHorizontal ? FlutterLogoStyle.horizontal
	: FlutterLogoStyle.stacked
	: FlutterLogoStyle.markOnly,
	lightColor: _logoColor.shade400,
	darkColor: _logoColor.shade900,
	textColor: widget.light ? const Color(0xFF616161) : const Color(0xFF9E9E9E),
	),
	duration: const Duration(milliseconds: 750),
	child: new GestureDetector(
	onLongPress: () {
	setState(() {
	_logoHorizontal = !_logoHorizontal;
	if (!_logoHasName)
	_logoHasName = true;
	});
	},
	onTap: () {
	setState(() {
	_logoHasName = !_logoHasName;
	});
	},
	onDoubleTap: () {
	setState(() {
	final List<MaterialColor> options = <MaterialColor>[];
	if (_logoColor != Colors.blue)
	options.addAll(<MaterialColor>[Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue, Colors.blue]);
	if (_logoColor != Colors.amber)
	options.addAll(<MaterialColor>[Colors.amber, Colors.amber, Colors.amber]);
	if (_logoColor != Colors.red)
	options.addAll(<MaterialColor>[Colors.red, Colors.red, Colors.red]);
	if (_logoColor != Colors.indigo)
	options.addAll(<MaterialColor>[Colors.indigo, Colors.indigo, Colors.indigo]);
	if (_logoColor != Colors.pink)
	options.addAll(<MaterialColor>[Colors.pink]);
	if (_logoColor != Colors.purple)
	options.addAll(<MaterialColor>[Colors.purple]);
	if (_logoColor != Colors.cyan)
	options.addAll(<MaterialColor>[Colors.cyan]);
	_logoColor = options[new math.Random().nextInt(options.length)];
	});
	}
	),
	),
	);
	}
	}

	class GalleryDrawer extends StatelessWidget {
	const GalleryDrawer({
	Key key,
	this.galleryTheme,
	@required this.onThemeChanged,
	this.timeDilation,
	@required this.onTimeDilationChanged,
	this.textScaleFactor,
	this.onTextScaleFactorChanged,
	this.showPerformanceOverlay,
	this.onShowPerformanceOverlayChanged,
	this.checkerboardRasterCacheImages,
	this.onCheckerboardRasterCacheImagesChanged,
	this.checkerboardOffscreenLayers,
	this.onCheckerboardOffscreenLayersChanged,
	this.onPlatformChanged,
	this.overrideDirection: TextDirection.ltr,
	this.onOverrideDirectionChanged,
	this.onSendFeedback,
	}) : assert(onThemeChanged != null),
	assert(onTimeDilationChanged != null),
	super(key: key);

	final GalleryTheme galleryTheme;
	final ValueChanged<GalleryTheme> onThemeChanged;

	final double timeDilation;
	final ValueChanged<double> onTimeDilationChanged;

	final double textScaleFactor;
	final ValueChanged<double> onTextScaleFactorChanged;

	final bool showPerformanceOverlay;
	final ValueChanged<bool> onShowPerformanceOverlayChanged;

	final bool checkerboardRasterCacheImages;
	final ValueChanged<bool> onCheckerboardRasterCacheImagesChanged;

	final bool checkerboardOffscreenLayers;
	final ValueChanged<bool> onCheckerboardOffscreenLayersChanged;

	final ValueChanged<TargetPlatform> onPlatformChanged;

	final TextDirection overrideDirection;
	final ValueChanged<TextDirection> onOverrideDirectionChanged;

	final VoidCallback onSendFeedback;

	@override
	Widget build(BuildContext context) {
	final ThemeData themeData = Theme.of(context);
	final TextStyle aboutTextStyle = themeData.textTheme.body2;
	final TextStyle linkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);

	final List<Widget> themeItems = kAllGalleryThemes.map<Widget>((GalleryTheme theme) {
	return new RadioListTile<GalleryTheme>(
	title: new Text(theme.name),
	secondary: new Icon(theme.icon),
	value: theme,
	groupValue: galleryTheme,
	onChanged: onThemeChanged,
	selected: galleryTheme == theme,
	);
	}).toList();

	final Widget mountainViewItem = new RadioListTile<TargetPlatform>(
	// on iOS, we don't want to show an Android phone icon
	secondary: new Icon(defaultTargetPlatform == TargetPlatform.iOS ? Icons.star : Icons.phone_android),
	title: new Text(defaultTargetPlatform == TargetPlatform.iOS ? 'Mountain View' : 'Android'),
	value: TargetPlatform.android,
	groupValue: Theme.of(context).platform,
	onChanged: onPlatformChanged,
	selected: Theme.of(context).platform == TargetPlatform.android,
	);

	final Widget cupertinoItem = new RadioListTile<TargetPlatform>(
	// on iOS, we don't want to show the iPhone icon
	secondary: new Icon(defaultTargetPlatform == TargetPlatform.iOS ? Icons.star_border : Icons.phone_iphone),
	title: new Text(defaultTargetPlatform == TargetPlatform.iOS ? 'Cupertino' : 'iOS'),
	value: TargetPlatform.iOS,
	groupValue: Theme.of(context).platform,
	onChanged: onPlatformChanged,
	selected: Theme.of(context).platform == TargetPlatform.iOS,
	);

	final List<Widget> textSizeItems = <Widget>[];
	final Map<double, String> textSizes = <double, String>{
	null: 'System Default',
	0.8: 'Small',
	1.0: 'Normal',
	1.3: 'Large',
	2.0: 'Huge',
	};
	for (double size in textSizes.keys) {
	textSizeItems.add(new RadioListTile<double>(
	secondary: const Icon(Icons.text_fields),
	title: new Text(textSizes[size]),
	value: size,
	groupValue: textScaleFactor,
	onChanged: onTextScaleFactorChanged,
	selected: textScaleFactor == size,
	));
	}

	final Widget animateSlowlyItem = new CheckboxListTile(
	title: const Text('Animate Slowly'),
	value: timeDilation != 1.0,
	onChanged: (bool value) {
	onTimeDilationChanged(value ? 20.0 : 1.0);
	},
	secondary: const Icon(Icons.hourglass_empty),
	selected: timeDilation != 1.0,
	);

	final Widget overrideDirectionItem = new CheckboxListTile(
	title: const Text('Force RTL'),
	value: overrideDirection == TextDirection.rtl,
	onChanged: (bool value) {
	onOverrideDirectionChanged(value ? TextDirection.rtl : TextDirection.ltr);
	},
	secondary: const Icon(Icons.format_textdirection_r_to_l),
	selected: overrideDirection == TextDirection.rtl,
	);

	final Widget sendFeedbackItem = new ListTile(
	leading: const Icon(Icons.report),
	title: const Text('Send feedback'),
	onTap: onSendFeedback ?? () {
	launch('https://github.com/flutter/flutter/issues/new');
	},
	);

	final Widget aboutItem = new AboutListTile(
	icon: const FlutterLogo(),
	applicationVersion: 'April 2017 Preview',
	applicationIcon: const FlutterLogo(),
	applicationLegalese: '© 2017 The Chromium Authors',
	aboutBoxChildren: <Widget>[
	new Padding(
	padding: const EdgeInsets.only(top: 24.0),
	child: new RichText(
	text: new TextSpan(
	children: <TextSpan>[
	new TextSpan(
	style: aboutTextStyle,
	text: 'Flutter is an early-stage, open-source project to help developers'
	'build high-performance, high-fidelity, mobile apps for '
	'${defaultTargetPlatform == TargetPlatform.iOS ? 'multiple platforms' : 'iOS and Android'} '
	'from a single codebase. This gallery is a preview of '
	"Flutter's many widgets, behaviors, animations, layouts, "
	'and more. Learn more about Flutter at '
	),
	new LinkTextSpan(
	style: linkStyle,
	url: 'https://flutter.io'
	),
	new TextSpan(
	style: aboutTextStyle,
	text: '.\n\nTo see the source code for this app, please visit the '
	),
	new LinkTextSpan(
	style: linkStyle,
	url: 'https://goo.gl/iv1p4G',
	text: 'flutter github repo'
	),
	new TextSpan(
	style: aboutTextStyle,
	text: '.'
	)
	]
	)
	)
	)
	]
	);

	final List<Widget> allDrawerItems = <Widget>[
	new GalleryDrawerHeader(
	light: galleryTheme.theme.brightness == Brightness.light,
	),
	]
	..addAll(themeItems)
	..addAll(<Widget>[
	const Divider(),
	mountainViewItem,
	cupertinoItem,
	const Divider(),
	])
	..addAll(textSizeItems)
	..addAll(<Widget>[
	overrideDirectionItem,
	const Divider(),
	animateSlowlyItem,
	const Divider(),
	]);

	bool addedOptionalItem = false;
	if (onCheckerboardOffscreenLayersChanged != null) {
	allDrawerItems.add(new CheckboxListTile(
	title: const Text('Checkerboard Offscreen Layers'),
	value: checkerboardOffscreenLayers,
	onChanged: onCheckerboardOffscreenLayersChanged,
	secondary: const Icon(Icons.assessment),
	selected: checkerboardOffscreenLayers,
	));
	addedOptionalItem = true;
	}

	if (onCheckerboardRasterCacheImagesChanged != null) {
	allDrawerItems.add(new CheckboxListTile(
	title: const Text('Checkerboard Raster Cache Images'),
	value: checkerboardRasterCacheImages,
	onChanged: onCheckerboardRasterCacheImagesChanged,
	secondary: const Icon(Icons.assessment),
	selected: checkerboardRasterCacheImages,
	));
	addedOptionalItem = true;
	}

	if (onShowPerformanceOverlayChanged != null) {
	allDrawerItems.add(new CheckboxListTile(
	title: const Text('Performance Overlay'),
	value: showPerformanceOverlay,
	onChanged: onShowPerformanceOverlayChanged,
	secondary: const Icon(Icons.assessment),
	selected: showPerformanceOverlay,
	));
	addedOptionalItem = true;
	}

	if (addedOptionalItem)
	allDrawerItems.add(const Divider());

	allDrawerItems.addAll(<Widget>[
	sendFeedbackItem,
	aboutItem,
	]);

	return new Drawer(child: new ListView(primary: false, children: allDrawerItems));
	}
	}