69 lines
2.1 KiB
C#
69 lines
2.1 KiB
C#
using System.Windows;
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using System.Windows.Interop;
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namespace Sai.Toolkit.Core.Helpers;
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public sealed record SingletonViewHelper<T>
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where T : Window, new()
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{
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private static T _instance;
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private static readonly object Padlock = new();
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private SingletonViewHelper() { }
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public static T GetInstance(out bool isNewCreate)
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{
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isNewCreate = false;
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//double-check locking
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if (_instance == null)
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{
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isNewCreate = true;
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lock (Padlock)
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{
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_instance ??= new T();
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_instance.Closed += OnWindowClosed;
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}
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}
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return _instance;
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}
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private static void OnWindowClosed(object sender, EventArgs e)
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{
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_instance = null;
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}
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}
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public static class SingletonChildWindowManager
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{
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private static readonly Dictionary<Type, Window> Windows = [];
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public static void ShowOrActivate<TWindow, TViewModel>(params object[] viewModelParams)
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where TWindow : Window, new()
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where TViewModel : class
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{
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var windowType = typeof(TWindow);
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if (Windows.TryGetValue(windowType, out var window) && window != null)
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{
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window.Activate();
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}
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else
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{
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//CloseAllWindowsExcept(windowType);
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Windows[windowType] = new TWindow();
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Windows[windowType].Closed += (sender, args) => Windows[windowType] = null;
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if (Windows[windowType].DataContext == null || Windows[windowType].DataContext is not TViewModel)
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{
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if (viewModelParams.Length == 0)
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{
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Windows[windowType].DataContext = Activator.CreateInstance(typeof(TViewModel));
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}
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else
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{
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Windows[windowType].DataContext = Activator.CreateInstance(typeof(TViewModel), viewModelParams);
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}
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}
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_ = new WindowInteropHelper(Windows[windowType]) { Owner = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle };
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Windows[windowType].Show();
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}
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}
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}
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