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juseong ahn
my-first-flutter
Commits
60a6e4e7
Commit
60a6e4e7
authored
1 year ago
by
juseong ahn
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879387c9
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879387c9
import
'package:english_words/english_words.dart'
;
import
'package:flutter/material.dart'
;
import
'package:flutter/rendering.dart'
;
import
'package:provider/provider.dart'
;
void
main
()
{
runApp
(
MyApp
());
}
class
MyApp
extends
StatelessWidget
{
const
MyApp
({
super
.
key
});
@override
Widget
build
(
BuildContext
context
)
{
return
ChangeNotifierProvider
(
create:
(
context
)
=
>
MyAppState
(),
child:
MaterialApp
(
title:
'Namer App'
,
theme:
ThemeData
(
useMaterial3:
true
,
colorScheme:
ColorScheme
.
fromSeed
(
seedColor:
Colors
.
yellow
),
),
home:
MyHomePage
(),
),
);
}
}
class
MyAppState
extends
ChangeNotifier
{
var
current
=
WordPair
.
random
();
void
getNext
()
{
current
=
WordPair
.
random
();
notifyListeners
();
}
// ↓ Add the code below.
var
favorites
=
<
WordPair
>[];
void
toggleFavorite
()
{
if
(
favorites
.
contains
(
current
))
{
favorites
.
remove
(
current
);
}
else
{
favorites
.
add
(
current
);
}
notifyListeners
();
}
}
class
MyHomePage
extends
StatefulWidget
{
@override
State
<
MyHomePage
>
createState
()
=
>
_MyHomePageState
();
}
class
_MyHomePageState
extends
State
<
MyHomePage
>
{
var
selectedIndex
=
0
;
// ← Add this property.
@override
Widget
build
(
BuildContext
context
)
{
Widget
page
;
switch
(
selectedIndex
)
{
case
0
:
page
=
GeneratorPage
();
break
;
case
1
:
page
=
FavoritesPage
();
break
;
default
:
throw
UnimplementedError
(
'no widget for
$selectedIndex
'
);
}
return
LayoutBuilder
(
builder:
(
context
,
constraints
)
{
return
Scaffold
(
body:
Row
(
children:
[
SafeArea
(
child:
NavigationRail
(
extended:
constraints
.
maxWidth
>
=
600
,
// ← Here.
destinations:
[
NavigationRailDestination
(
icon:
Icon
(
Icons
.
home
),
label:
Text
(
'Home'
),
),
NavigationRailDestination
(
icon:
Icon
(
Icons
.
favorite
),
label:
Text
(
'Favorites'
),
),
],
selectedIndex:
selectedIndex
,
// ← Change to this.
onDestinationSelected:
(
value
)
{
// ↓ Replace print with this.
setState
(()
{
selectedIndex
=
value
;
});
},
),
),
Expanded
(
child:
Container
(
color:
Theme
.
of
(
context
)
.
colorScheme
.
primaryContainer
,
child:
page
,
//GeneratorPage(),
),
),
],
),
);
}
);
}
}
class
GeneratorPage
extends
StatelessWidget
{
@override
Widget
build
(
BuildContext
context
)
{
var
appState
=
context
.
watch
<
MyAppState
>();
var
pair
=
appState
.
current
;
IconData
icon
;
if
(
appState
.
favorites
.
contains
(
pair
))
{
icon
=
Icons
.
favorite
;
}
else
{
icon
=
Icons
.
favorite_border
;
}
return
Center
(
child:
Column
(
mainAxisAlignment:
MainAxisAlignment
.
center
,
children:
[
BigCard
(
pair:
pair
),
SizedBox
(
height:
10
),
Row
(
mainAxisSize:
MainAxisSize
.
min
,
children:
[
ElevatedButton
.
icon
(
onPressed:
()
{
appState
.
toggleFavorite
();
},
icon:
Icon
(
icon
),
label:
Text
(
'Like'
),
),
SizedBox
(
width:
10
),
ElevatedButton
(
onPressed:
()
{
appState
.
getNext
();
},
child:
Text
(
'Next'
),
),
],
),
],
),
);
}
}
class
BigCard
extends
StatelessWidget
{
const
BigCard
({
super
.
key
,
required
this
.
pair
,
});
final
WordPair
pair
;
@override
Widget
build
(
BuildContext
context
)
{
final
theme
=
Theme
.
of
(
context
);
// ↓ Add this.
final
style
=
theme
.
textTheme
.
displayMedium
!.
copyWith
(
color:
theme
.
colorScheme
.
onPrimary
,
);
return
Card
(
color:
theme
.
colorScheme
.
primary
,
child:
Padding
(
padding:
const
EdgeInsets
.
all
(
20
),
// ↓ Change this line.
child:
Text
(
pair
.
asLowerCase
,
style:
style
,
semanticsLabel:
"
${pair.first}
${pair.second}
"
,
),
),
);
}
}
class
FavoritesPage
extends
StatelessWidget
{
@override
Widget
build
(
BuildContext
context
)
{
var
appState
=
context
.
watch
<
MyAppState
>();
if
(
appState
.
favorites
.
isEmpty
)
{
return
Center
(
child:
Text
(
'(null)'
),
);
}
return
ListView
(
children:
[
Padding
(
padding:
const
EdgeInsets
.
all
(
20
),
child:
Text
(
'You have '
'
${appState.favorites.length}
favorites:'
),
),
for
(
var
pair
in
appState
.
favorites
)
ListTile
(
leading:
Icon
(
Icons
.
favorite
),
title:
Text
(
pair
.
asLowerCase
),
),
],
);
}
}
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