hello I want when I click button for example to stay in the same page but view another screen in specific container without duplicating page with different content

CodePudding user response：

You could create an enum with the current selected page.

enum CurrentPage {
HomePage,
LoginPage,
RegisterPage,
}

Declare a variable to save the current selected page:

CurrentPage currentPage = CurrentPage.HomePage;

When you click on a button you change the current page:

onPressed: (){
setState(() {
      currentPage = CurrentPage.RegisterPage;
    });
}

In your code you ask for the current state and accordingly you change the widget:

Widget content = Container();

switch (currentPage) {
     
     case CurrentPage.HomePage:
        content = HomePage();
       break;
     case CurrentPage.LoginPage:
       content = LoginPage();
       break;
     ....
   }

And this widget is placed in your Widget Tree.