Flutter Room Management App Code Refinement

Posted on Mar 9, 2026 in Computers

Code Cleanup and Structure Improvement

The provided code snippets appear to be fragmented parts of a Flutter application, likely dealing with room management (insertion and updates). Below is a structured and corrected presentation of the logic, assuming necessary external definitions like Room, roomList, and controller initializations exist.

Room Insertion Logic Refinement

This section focuses on adding a new room entry.

Widget for Adding a New Room

Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(title: Text("Insert Room")),
    body: Padding(
      padding: EdgeInsets.all(16.0),
      child: Column(
        children: [
          TextField(
            controller: number,
            decoration: InputDecoration(labelText: "Room Number"),
          ),
          TextField(
            controller: type,
            decoration: InputDecoration(labelText: "Room Type"),
          ),
          TextField(
            controller: floor,
            decoration: InputDecoration(labelText: "Floor"),
          ),
          TextField(
            controller: rate,
            keyboardType: TextInputType.number,
            decoration: InputDecoration(labelText: "Nightly Rate"),
          ),
          SizedBox(height: 20),
          ElevatedButton(
            onPressed: addRoom, 
            child: Text("Save Room")
          ),
          SizedBox(height: 20),
          Text(message, style: TextStyle(color: Colors.red)),
        ],
      ),
    ),
  );
}

void addRoom() {
  // Assuming clear operations happen here or upon success
  number.clear(); 
  type.clear(); 
  floor.clear(); 
  rate.clear();
  setState(() {message = "Room Added";});
}

Room Listing and Display

This snippet shows how to display the list of rooms using ListView.builder.

Building the Room List View

Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(title: Text("Room List")),
    body: ListView.builder(
      itemCount: roomList.length,
      itemBuilder: (context, index) {
        return ListTile(
          title: Text("Room ${roomList[index].number}"),
          subtitle: Text(
            "Type: ${roomList[index].type}\n" 
            "Rate: ${roomList[index].rate}"
          ),
        );
      },
    ),
  );
}

Holiday Surcharge Update Logic

This section handles applying a 25% surcharge to a specific room’s rate.

UpdateScreen State Management

class UpdateScreen extends StatefulWidget {
  @override
  State<UpdateScreen> createState() => _UpdateScreenState();
}

class _UpdateScreenState extends State<UpdateScreen> {
  TextEditingController number = TextEditingController();
  String message = "";

  void applySurcharge() {
    if (number.text.isEmpty) {
      setState(() { message = "Enter Room Number"; });
      return;
    }
    
    Room? r;
    for (var e in roomList) {
      if (e.number == number.text) {
        r = e;
        break;
      }
    }

    if (r == null) {
      setState(() { message = "Room Not Found"; });
      return;
    }
    
    r.rate = r.rate * 1.25;
    setState(() {message = "Rate Updated";});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Holiday Surcharge")),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: number,
              decoration: InputDecoration(labelText: "Room Number"),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: applySurcharge,
              child: Text("Apply 25% Increase"),
            ),
            SizedBox(height: 20),
            Text(message, style: TextStyle(color: Colors.red),),
          ],
        ),
      ),
    );
  }
}

/* --- DISPLAY --- */
class DisplayScreen extends StatelessWidget {
  @override
  // ... rest of DisplayScreen implementation
}