109 lines
3.3 KiB
C#
109 lines
3.3 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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using Unity.Properties;
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using Unity.Services.Multiplayer;
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using UnityEngine.UIElements;
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namespace Blocks.Sessions.Common
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{
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public class PlayerCountViewModel : INotifyBindablePropertyChanged, IDataSourceViewHashProvider, IDisposable
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{
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const string k_DefaultDisplayText = "- / - Players";
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SessionObserver m_SessionObserver;
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ISession m_Session;
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long m_UpdateVersion;
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/// <summary>
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/// This property is bound to <see cref="PlayerCountLabel.text"/> so that the label displays the number of
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/// players in the session.
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/// It is a property using [CreateProperty] attribute to allow for data binding in UIToolkit
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/// <summary>
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[CreateProperty]
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public string DisplayText
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{
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get => m_DisplayText;
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set
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{
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if (m_DisplayText == value)
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{
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return;
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}
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m_DisplayText = value;
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++m_UpdateVersion;
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Notify();
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}
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}
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string m_DisplayText = k_DefaultDisplayText;
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public PlayerCountViewModel(string sessionType)
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{
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m_SessionObserver = new SessionObserver(sessionType);
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m_SessionObserver.SessionAdded += OnSessionAdded;
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if (m_SessionObserver.Session != null)
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{
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OnSessionAdded(m_SessionObserver.Session);
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}
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}
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void OnSessionAdded(ISession newSession)
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{
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m_Session = newSession;
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m_Session.Changed += OnSessionChanged;
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m_Session.RemovedFromSession += OnSessionRemoved;
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m_Session.Deleted += OnSessionRemoved;
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OnSessionChanged();
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}
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void OnSessionRemoved()
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{
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DisplayText = k_DefaultDisplayText;
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CleanUpSession();
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}
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void CleanUpSession()
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{
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m_Session.RemovedFromSession -= OnSessionRemoved;
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m_Session.Deleted -= OnSessionRemoved;
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m_Session.Changed -= OnSessionChanged;
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m_Session = null;
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}
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void OnSessionChanged()
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{
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DisplayText = $"{m_Session.Players.Count} / {m_Session.MaxPlayers} Players";
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}
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public void Dispose()
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{
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if (m_SessionObserver != null)
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{
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m_SessionObserver.Dispose();
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m_SessionObserver = null;
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}
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if (m_Session != null)
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{
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CleanUpSession();
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}
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}
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/// <summary>
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/// This method is used by UIToolkit to determine if any data bound to the UI has changed.
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/// Instead of hashing the data, an m_UpdateVersion counter is incremented when changes occur.
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/// </summary>
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public long GetViewHashCode() => m_UpdateVersion;
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/// <summary>
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/// Suggested implementation of INotifyBindablePropertyChanged from UIToolkit.
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/// </summary>
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public event EventHandler<BindablePropertyChangedEventArgs> propertyChanged;
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void Notify([CallerMemberName] string property = null)
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{
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propertyChanged?.Invoke(this, new BindablePropertyChangedEventArgs(property));
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}
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}
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}
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