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328
AntDesignWPF/Controls/Notification/NotificationManager.cs
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328
AntDesignWPF/Controls/Notification/NotificationManager.cs
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using System.ComponentModel;
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namespace AntDesignWPF.Controls;
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public enum NotificationPlacement
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{
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TopRight,
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TopLeft,
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BottomRight,
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BottomLeft
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}
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//public static class NotificationManager
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//{
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// private static readonly Dictionary<NotificationPlacement, List<NotificationView>> _activeNotifications = new Dictionary<NotificationPlacement, List<NotificationView>>
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// {
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// { NotificationPlacement.TopRight, new List<NotificationView>() },
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// { NotificationPlacement.TopLeft, new List<NotificationView>() },
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// { NotificationPlacement.BottomRight, new List<NotificationView>() },
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// { NotificationPlacement.BottomLeft, new List<NotificationView>() }
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// };
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// private static readonly object _lock = new object();
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// public static void Show(string title, string message, NotificationType type = NotificationType.Info, NotificationPlacement placement = NotificationPlacement.TopRight, int durationSeconds = 3)
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// {
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// var duration = TimeSpan.FromSeconds(durationSeconds);
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// Application.Current.Dispatcher.Invoke(() =>
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// {
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// var notificationWindow = new NotificationView(title, message, type, duration);
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// notificationWindow.Closed += (s, e) =>
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// {
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// lock (_lock)
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// {
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// _activeNotifications[placement].Remove(notificationWindow);
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// Reposition(placement);
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// }
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// };
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// lock (_lock)
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// {
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// _activeNotifications[placement].Add(notificationWindow);
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// Reposition(placement);
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// }
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// notificationWindow.Show();
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// });
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// }
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// private static void Reposition(NotificationPlacement placement)
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// {
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// var workArea = SystemParameters.WorkArea;
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// var notifications = _activeNotifications[placement];
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// double currentTop = workArea.Top + 10;
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// double currentBottom = workArea.Bottom - 10;
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// foreach (var window in notifications)
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// {
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// // 如果窗口尚未加载，先在屏幕外显示以获取其实际尺寸
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// if (!window.IsLoaded)
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// {
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// window.WindowStartupLocation = WindowStartupLocation.Manual;
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// window.Left = -9999;
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// window.Top = -9999;
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// // 调用Show()会使窗口加载并经过布局计算
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// // 对于非模态窗口，这不会阻塞代码执行
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// window.Show();
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// }
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// // 经过Show()之后，ActualHeight和ActualWidth就已经是准确的了
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// if (placement == NotificationPlacement.TopRight || placement == NotificationPlacement.TopLeft)
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// {
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// window.Top = currentTop;
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// currentTop += window.ActualHeight + 10;
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// }
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// else // BottomRight or BottomLeft
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// {
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// window.Top = currentBottom - window.ActualHeight;
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// currentBottom -= (window.ActualHeight + 10);
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// }
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// if (placement == NotificationPlacement.TopRight || placement == NotificationPlacement.BottomRight)
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// {
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// // 在这里应该使用ActualWidth，特别是当窗口宽度为"Auto"时
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// window.Left = workArea.Right - window.ActualWidth - 10;
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// }
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// else // TopLeft or BottomLeft
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// {
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// window.Left = workArea.Left + 10;
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// }
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// }
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// }
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//}
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public static class NotificationManager
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{
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// 使用 ConditionalWeakTable 来将通知列表与父窗口关联。
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// 这有助于自动处理内存，当父窗口被垃圾回收时，关联的通知列表也会被回收，避免了内存泄漏。
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private static readonly System.Runtime.CompilerServices.ConditionalWeakTable<Window, Dictionary<NotificationPlacement, List<NotificationView>>> _windowNotifications =
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new System.Runtime.CompilerServices.ConditionalWeakTable<Window, Dictionary<NotificationPlacement, List<NotificationView>>>();
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// 保留一个用于全局通知的静态字典（当 owner 为 null 时使用）
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private static readonly Dictionary<NotificationPlacement, List<NotificationView>> _globalNotifications =
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new Dictionary<NotificationPlacement, List<NotificationView>>
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{
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{ NotificationPlacement.TopRight, new List<NotificationView>() },
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{ NotificationPlacement.TopLeft, new List<NotificationView>() },
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{ NotificationPlacement.BottomRight, new List<NotificationView>() },
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{ NotificationPlacement.BottomLeft, new List<NotificationView>() }
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};
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private static readonly object _lock = new object();
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/// <summary>
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/// 显示一个通知。
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/// </summary>
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/// <param name="owner">通知要附着到的父窗口。如果为 null，则显示为全局通知。</param>
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/// <param name="title">标题</param>
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/// <param name="message">消息</param>
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/// <param name="type">类型</param>
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/// <param name="placement">位置</param>
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/// <param name="durationSeconds">显示时长（秒）</param>
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public static void Show(Window owner, string title, string message, NotificationType type = NotificationType.Info, NotificationPlacement placement = NotificationPlacement.TopRight, int durationSeconds = 3)
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{
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var duration = TimeSpan.FromSeconds(durationSeconds);
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// 必须在UI线程上执行
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Application.Current.Dispatcher.Invoke(() =>
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{
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var notificationWindow = new NotificationView(title, message, type, duration);
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notificationWindow.Owner = owner; // 设置所有者
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// 获取或创建与此窗口关联的通知列表
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var activeNotifications = GetNotificationListForOwner(owner);
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notificationWindow.Closed += (s, e) =>
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{
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lock (_lock)
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{
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activeNotifications[placement].Remove(notificationWindow);
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// 如果这是父窗口的最后一个通知，则取消事件订阅
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if (owner != null && !HasActiveNotifications(owner))
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{
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UnsubscribeFromOwnerEvents(owner);
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}
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Reposition(owner, placement);
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}
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};
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lock (_lock)
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{
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// 如果是第一个为该窗口创建的通知，则订阅事件
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if (owner != null && !HasActiveNotifications(owner))
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{
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SubscribeToOwnerEvents(owner);
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}
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activeNotifications[placement].Add(notificationWindow);
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Reposition(owner, placement);
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}
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// Show() 必须在 Reposition 之后调用，以确保初始位置正确
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notificationWindow.Show();
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});
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}
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// 重载一个 Show 方法以保持与旧 API 的兼容性（全局通知）
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public static void Show(string title, string message, NotificationType type = NotificationType.Info, NotificationPlacement placement = NotificationPlacement.TopRight, int durationSeconds = 3)
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{
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Show(null, title, message, type, placement, durationSeconds);
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}
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private static Dictionary<NotificationPlacement, List<NotificationView>> GetNotificationListForOwner(Window owner)
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{
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if (owner == null)
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{
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return _globalNotifications;
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}
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lock (_lock)
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{
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return _windowNotifications.GetValue(owner, key =>
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{
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// 当 ConditionalWeakTable 中没有找到该窗口的条目时，此工厂方法被调用
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return new Dictionary<NotificationPlacement, List<NotificationView>>
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{
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{ NotificationPlacement.TopRight, new List<NotificationView>() },
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{ NotificationPlacement.TopLeft, new List<NotificationView>() },
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{ NotificationPlacement.BottomRight, new List<NotificationView>() },
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{ NotificationPlacement.BottomLeft, new List<NotificationView>() }
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};
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});
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}
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}
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private static bool HasActiveNotifications(Window owner)
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{
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if (owner == null) return false;
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var lists = GetNotificationListForOwner(owner);
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foreach (var list in lists.Values)
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{
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if (list.Count > 0) return true;
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}
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return false;
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}
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private static void SubscribeToOwnerEvents(Window owner)
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{
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owner.LocationChanged += OnOwnerMoved;
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owner.SizeChanged += OnOwnerMoved;
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owner.StateChanged += OnOwnerStateChanged;
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owner.Closing += OnOwnerClosing; // 确保在父窗口关闭时清理
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}
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private static void UnsubscribeFromOwnerEvents(Window owner)
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{
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owner.LocationChanged -= OnOwnerMoved;
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owner.SizeChanged -= OnOwnerMoved;
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owner.StateChanged -= OnOwnerStateChanged;
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owner.Closing -= OnOwnerClosing;
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}
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private static void OnOwnerClosing(object sender, CancelEventArgs e)
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{
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if (sender is Window owner)
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{
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// 不需要手动关闭通知，因为设置了Owner会自动关闭
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// 但需要取消订阅
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UnsubscribeFromOwnerEvents(owner);
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}
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}
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private static void OnOwnerStateChanged(object sender, EventArgs e)
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{
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if (sender is Window owner)
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{
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var notifications = GetNotificationListForOwner(owner);
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var visibility = (owner.WindowState == WindowState.Minimized) ? Visibility.Collapsed : Visibility.Visible;
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foreach (var list in notifications.Values)
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{
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foreach (var notificationView in list)
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{
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notificationView.Visibility = visibility;
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}
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}
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// 恢复时重新定位
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if (visibility == Visibility.Visible)
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{
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RepositionAll(owner);
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}
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}
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}
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private static void OnOwnerMoved(object sender, EventArgs e)
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{
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if (sender is Window owner)
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{
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RepositionAll(owner);
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}
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}
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private static void RepositionAll(Window owner)
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{
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Reposition(owner, NotificationPlacement.TopRight);
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Reposition(owner, NotificationPlacement.TopLeft);
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Reposition(owner, NotificationPlacement.BottomRight);
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Reposition(owner, NotificationPlacement.BottomLeft);
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}
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private static void Reposition(Window owner, NotificationPlacement placement)
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{
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var activeNotifications = GetNotificationListForOwner(owner);
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var notifications = activeNotifications[placement];
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if (notifications.Count == 0) return;
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// 获取定位基准区域
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Rect workArea;
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if (owner != null && owner.IsLoaded)
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{
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// 如果父窗口最小化，则不进行重定位
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if (owner.WindowState == WindowState.Minimized) return;
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workArea = new Rect(owner.Left, owner.Top, owner.ActualWidth, owner.ActualHeight);
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}
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else
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{
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workArea = SystemParameters.WorkArea;
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}
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double currentTop = workArea.Top + 10;
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double currentBottom = workArea.Bottom - 10;
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foreach (var window in notifications)
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{
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// 确保窗口已加载以获取其实际尺寸
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if (!window.IsLoaded)
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{
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window.WindowStartupLocation = WindowStartupLocation.Manual;
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window.Left = -9999;
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window.Top = -9999;
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window.Show();
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window.Activate(); // 激活以确保尺寸计算完成
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}
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if (placement == NotificationPlacement.TopRight || placement == NotificationPlacement.TopLeft)
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{
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window.Top = currentTop;
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currentTop += window.ActualHeight + 10;
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}
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else // BottomRight or BottomLeft
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{
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window.Top = currentBottom - window.ActualHeight;
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currentBottom -= (window.ActualHeight + 10);
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}
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if (placement == NotificationPlacement.TopRight || placement == NotificationPlacement.BottomRight)
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{
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window.Left = workArea.Right - window.ActualWidth - 10;
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}
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else // TopLeft or BottomLeft
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{
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window.Left = workArea.Left + 10;
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}
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}
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}
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}
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