我是Dart和Flutter框架的新手。当前,我有一个由25个按钮填充的GridView。默认情况下,每个按钮都有橙色背景色。但是,我想为用户提供一个选项,使其可以长按任意一个按钮,然后会弹出一个PopUpMenu,让他们可以选择在为按钮选择其他颜色之间进行选择。这是我尝试过的两件事:
我该如何解决这个问题?我将在下面提供一些代码片段以帮助您。请注意,此代码指的是#2的实现方式。
25按钮实例化:
// Random number generator
var _randGen = new Random();
//List of maze cards
List<Widget> mazeCards = new List();
// Generate cards until it has 25 cards within the list
while(mazeCards.length != 25)
{
// Get the index
var _currIndex = _randGen.nextInt(words.length);
// Add the card to the list
var _cardColor = Colors.orange;
mazeCards.add(createCard(words[_currIndex], _cardColor));
}
createCard方法:
Widget createCard(String someString, Color _cardColor)
{
return GestureDetector(
onTapDown: _storePosition,
child: Container(
padding: EdgeInsets.all(8.0),
child:
_createButton(someString, _cardColor)
),
);
}
createButton方法:
Widget _createButton(String someString, Color _cardColor)
{
Widget newButton = MaterialButton(
padding: EdgeInsets.all(50.0),
color: _cardColor,
onPressed: () => _printButtonText(someString),
onLongPress: () {
cardOptionsMenu(_cardColor);
},
textTheme: ButtonTextTheme.primary,
//_someColor(),
child: Text(someString)
);
return newButton;
}
cardOptionsMenu方法:
void cardOptionsMenu(Color _cardColor)
{
final RenderBox overlay = Overlay.of(context).context.findRenderObject();
showMenu(
context: context,
...
)
.then<void>((CardOptionEnum cardOption) {
if (cardOption == null) return;
else{
switch (cardOption)
{
case CardOptionEnum.makeBlackCard:
setState(() {
_cardColor = Colors.black;
});
break;
case CardOptionEnum.makeBlueCard:
setState(() {
_cardColor = Colors.blue;
});
break;
case CardOptionEnum.makeRedCard:
setState(() {
_cardColor = Colors.red;
});
break;
case CardOptionEnum.makeYellowCard:
setState(() {
_cardColor = Colors.yellow;
});
break;
case CardOptionEnum.changeWord:
break;
}
}
});
}