[英]Flutter] How can I toggle colors of multiple buttons
Let's suppose that I have 3 button( OutlinedButton
, in my case).假设我有 3 个按钮(在我的情况下为
OutlinedButton
)。
What I want to make is to toggle the color of outlines of all buttons, not individually.我想做的是切换所有按钮的轮廓颜色,而不是单独切换。
For example If I press button 1, the outline color of button 1 goes yellow, and the color of outlines of button 2 and 3 goes white.例如,如果我按下按钮 1,按钮 1 的轮廓颜色变为黄色,按钮 2 和 3 的轮廓颜色变为白色。
What I tried is this:我尝试的是这样的:
List<dynamic> colorlist_down = [Colors.amber,Colors.white,Colors.white];
...
return Row(
children:
[
OutlinedButton(
onPressed: (){
setState(() {
mode=0;
colorlist_down = [Colors.amber,Colors.white,Colors.white];
});
},
style: OutlinedButton.styleFrom(
primary: colorlist_down.elementAt(0),
side: BorderSide(color: colorlist_down.elementAt(0), width: 2),
),
child: Text('Filter : Age',style: TextStyle(color: Colors.brown[900]))
),
OutlinedButton(
onPressed: (){
setState(() {
mode=1;
colorlist_down = [Colors.white,Colors.amber,Colors.white];
});
},
style: OutlinedButton.styleFrom(
primary: colorlist_down.elementAt(1),
side: BorderSide(color: colorlist_down.elementAt(1), width: 2),
),
child: Text('Filter : Gender',style: TextStyle(color: Colors.brown[900]))
),
OutlinedButton(
onPressed: (){
setState(() {
mode=2;
colorlist_down = [Colors.white,Colors.white,Colors.amber];
});
},
style: OutlinedButton.styleFrom(
primary: colorlist_down.elementAt(2),
side: BorderSide(color: colorlist_down.elementAt(2), width: 2),
),
child: Text('Filter : Location',style: TextStyle(color: Colors.brown[900]))
),
]
);
Of course it did not work.当然它没有用。
I think that the style of buttons do not react to state change and somehow found that I should use MaterialStateProperty
, but cannot get how to use it correctly for my purpose.我认为按钮的样式不会对 state 更改做出反应,并且以某种方式发现我应该使用
MaterialStateProperty
,但无法了解如何正确使用它来达到我的目的。 Somebody please give me a help.有人请给我帮助。
-> You can create one object of Color class -> 您可以创建一个 object颜色class
-> Assign that object to all OutlinedButton with default color -> 将 object 分配给所有具有默认颜色的 OutlinedButton
-> While click on first button, as per your condition set color and refresh it using setState() -> 在单击第一个按钮时,根据您的条件设置颜色并使用 setState() 刷新它
For Each button to have its text and function, you may create a Label And Function class somewhere else.对于每个按钮都有其文本和 function,您可以在其他地方创建Label 和 Function ZA2F2ED4F298EBC2C454F46C745FZ。
class LabelAndFunction {
String label;
Function function;
LabelAndFunction({required this.label, required this.function});
}
Then for you buttons create a list of TextLAbel and Functions然后为您的按钮创建一个 TextLAbel 和 Functions 列表
List<LabelAndFunction> btnLbelsAndFunctions = [
LabelAndFunction(
label: "Filter : Age",
function: () {
// your function for filtering by age
}),
LabelAndFunction(
label: "Filter: Gender",
function: () {
// your function for filtering by gender
}),
LabelAndFunction(
label: "Filter: Location",
function: () {
// your function for filtering by location
}),
];
Now to know which of the button is active, you can create an activeBtnIndex variable现在要知道哪个按钮处于活动状态,您可以创建一个activeBtnIndex变量
int activeBtnIndex = 0
Then Make a listview Builder然后制作一个列表视图生成器
ListView.builder(
itemCount: btnLbelsAndFunctions.length,
itemBuilder: (context, index) {
return OutlinedButton(
onPressed: () {
setState(() {
activeBtnIndex = index;
});
btnLbelsAndFunctions.elementAt(index).function();
},
style: OutlinedButton.styleFrom(
primary: activeBtnIndex == index
? Colors.amber
: Colors.white,
side: BorderSide(
color: activeBtnIndex == index
? Colors.amber
: Colors.white,
),
),
child: Text(btnLbelsAndFunctions.elementAt(index).label,
style: TextStyle(color: Colors.brown[900])));
})
I solved my problem by ? :
我解决了我的问题
? :
? :
operator. ? :
运营商。
p0_0 = true;
p0_1 = false;
p0_2 = false;
...
onPressed:()
{
p0_0 = false;
p0_1 = true;
p0_2 = false;
setState(){
};
},
style: OutlinedButton.styleFrom( primary: colorlist_down.elementAt(2),side: BorderSide(color: p0_1? Colors.amberAccent:Colors.white, width: 2),
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