372 lines
15 KiB
C#
372 lines
15 KiB
C#
//using Prism.Ioc;
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//using System;
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//using System.Windows;
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//using System.Windows.Controls;
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//using System.Windows.Threading;
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//namespace YY.Admin.Views.Control
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//{
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// /// <summary>
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// /// TabContentView.xaml 的交互逻辑
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// /// </summary>
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// public partial class TabContentView : UserControl
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// {
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// public TabContentView()
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// {
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// InitializeComponent();
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// this.Loaded += TabContentView_Loaded;
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// this.Unloaded += TabContentView_Unloaded;
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// }
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// private bool _navigated = false;
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// private void TabContentView_Loaded(object sender, RoutedEventArgs e)
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// {
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// try
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// {
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// if (string.IsNullOrWhiteSpace(RegionName))
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// return;
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// var regionManager = ContainerLocator.Current.Resolve<IRegionManager>();
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// // 把内部 ContentControl 注册为 region（基于 RegionName）
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// RegionManager.SetRegionName(PART_ContentHost, RegionName);
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// RegionManager.SetRegionManager(PART_ContentHost, regionManager);
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// // 延迟导航，确保 region 真正注册到 RegionManager 并且模板生成为止
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// if (!_navigated && !string.IsNullOrEmpty(ViewName))
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// {
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// Dispatcher.BeginInvoke(new Action(() =>
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// {
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// try
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// {
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// // 再次检查 region 是否存在并执行导航
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// if (regionManager.Regions.ContainsRegionWithName(RegionName))
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// {
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// regionManager.RequestNavigate(RegionName, ViewName);
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// }
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// else
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// {
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// // 如果 region 仍然不存在，尝试 RequestNavigate（Prism 通常会创建 region）
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// regionManager.RequestNavigate(RegionName, ViewName);
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// }
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// }
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// catch (Exception ex)
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// {
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// System.Diagnostics.Debug.WriteLine($"TabContentView 导航异常: {ex.Message}");
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// }
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// }), DispatcherPriority.Background);
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// _navigated = true;
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// }
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// }
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// catch (Exception ex)
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// {
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// System.Diagnostics.Debug.WriteLine($"TabContentView_Loaded 出错: {ex.Message}");
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// }
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// }
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// private void TabContentView_Unloaded(object sender, RoutedEventArgs e)
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// {
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// try
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// {
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// if (!string.IsNullOrWhiteSpace(RegionName))
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// {
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// var regionManager = ContainerLocator.Current.Resolve<IRegionManager>();
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// if (regionManager.Regions.ContainsRegionWithName(RegionName))
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// {
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// var region = regionManager.Regions[RegionName];
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// region.RemoveAll();
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// regionManager.Regions.Remove(RegionName);
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// }
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// }
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// }
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// catch (Exception ex)
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// {
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// System.Diagnostics.Debug.WriteLine($"TabContentView_Unloaded 清理异常: {ex.Message}");
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// }
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// }
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// #region RegionName DP
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// public static readonly DependencyProperty RegionNameProperty =
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// DependencyProperty.Register(nameof(RegionName), typeof(string), typeof(TabContentView), new PropertyMetadata(null));
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// public string RegionName
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// {
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// get => (string)GetValue(RegionNameProperty);
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// set => SetValue(RegionNameProperty, value);
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// }
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// #endregion
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// #region ViewName DP
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// public static readonly DependencyProperty ViewNameProperty =
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// DependencyProperty.Register(nameof(ViewName), typeof(string), typeof(TabContentView), new PropertyMetadata(null));
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// public string ViewName
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// {
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// get => (string)GetValue(ViewNameProperty);
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// set => SetValue(ViewNameProperty, value);
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// }
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// #endregion
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// }
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//}
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using Prism.Ioc;
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using System;
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using System.Diagnostics;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Threading;
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namespace YY.Admin.Views.Control
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{
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public partial class TabContentView : UserControl
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{
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public TabContentView()
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{
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InitializeComponent();
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this.Loaded += TabContentView_Loaded;
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this.Unloaded += TabContentView_Unloaded;
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this.IsVisibleChanged += TabContentView_IsVisibleChanged;
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this.DataContextChanged += TabContentView_DataContextChanged;
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}
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private bool _navigated = false;
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private IRegionManager _regionManager;
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private DispatcherOperation _pendingNavigationOp;
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#region DPs
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public static readonly DependencyProperty RegionNameProperty =
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DependencyProperty.Register(nameof(RegionName), typeof(string), typeof(TabContentView), new PropertyMetadata(null, OnRegionOrViewNameChanged));
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public string RegionName
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{
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get => (string)GetValue(RegionNameProperty);
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set => SetValue(RegionNameProperty, value);
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}
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public static readonly DependencyProperty ViewNameProperty =
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DependencyProperty.Register(nameof(ViewName), typeof(string), typeof(TabContentView), new PropertyMetadata(null, OnRegionOrViewNameChanged));
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public string ViewName
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{
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get => (string)GetValue(ViewNameProperty);
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set => SetValue(ViewNameProperty, value);
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}
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#endregion
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private void TabContentView_Loaded(object sender, RoutedEventArgs e)
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{
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try
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{
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if (string.IsNullOrWhiteSpace(RegionName))
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return;
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_regionManager = ContainerLocator.Current.Resolve<IRegionManager>();
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// 确保 region/manager 设置在后续导航前准备好（但不要重复注册 region 这里）
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// We will call PrepareRegionForRegistration inside EnsureNavigateIfNeeded before actual registration.
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EnsureNavigateIfNeeded();
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"TabContentView_Loaded 出错: {ex.Message}");
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}
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}
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private void TabContentView_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
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=> EnsureNavigateIfNeeded();
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private void TabContentView_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
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=> EnsureNavigateIfNeeded();
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private void EnsureNavigateIfNeeded()
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{
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try
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{
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if (_navigated)
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return;
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if (string.IsNullOrWhiteSpace(RegionName) || string.IsNullOrWhiteSpace(ViewName))
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return;
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if (!IsLoaded || !IsVisible)
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return;
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if (_regionManager == null)
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_regionManager = ContainerLocator.Current.Resolve<IRegionManager>();
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// 在注册 region 之前准备 host（清理旧 region 与清空 Content），避免 Prism 抛 Content 非空异常
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PrepareRegionForRegistration();
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// 取消之前挂起的导航（保证最后一次胜出）
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if (_pendingNavigationOp != null && _pendingNavigationOp.Status == DispatcherOperationStatus.Pending)
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{
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Debug.WriteLine($"取消挂起导航: region={RegionName}, view={ViewName}");
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_pendingNavigationOp.Abort();
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_pendingNavigationOp = null;
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}
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var desiredView = ViewName;
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var desiredRegion = RegionName;
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_pendingNavigationOp = Dispatcher.BeginInvoke(new Action(() =>
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{
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try
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{
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if (_regionManager == null)
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_regionManager = ContainerLocator.Current.Resolve<IRegionManager>();
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// 现在把 PART_ContentHost 注册为一个 region（设置 RegionName/RegionManager）
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// 注意：如果前面清理正确，这里不会再触发 ContentControl already has content 错误
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RegionManager.SetRegionName(PART_ContentHost, desiredRegion);
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RegionManager.SetRegionManager(PART_ContentHost, _regionManager);
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Debug.WriteLine($"开始 RequestNavigate -> region={desiredRegion}, view={desiredView}");
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_regionManager.RequestNavigate(desiredRegion, desiredView, result =>
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{
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try
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{
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if (result.Success == true)
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{
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_navigated = true;
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Debug.WriteLine($"导航成功: region={desiredRegion}, view={desiredView}");
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}
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else
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{
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_navigated = false;
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Debug.WriteLine($"导航失败: region={desiredRegion}, view={desiredView}, error={result.Exception?.Message}");
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}
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}
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catch (Exception ex)
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{
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_navigated = false;
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Debug.WriteLine($"导航回调异常: {ex.Message}");
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}
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});
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"调度导航异常: {ex.Message}");
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}
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finally
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{
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_pendingNavigationOp = null;
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}
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}), DispatcherPriority.Background);
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Debug.WriteLine($"调度导航: Region={RegionName}, View={ViewName}, Loaded={IsLoaded}, Visible={IsVisible}, navigated={_navigated}");
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"EnsureNavigateIfNeeded 异常: {ex.Message}");
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}
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}
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/// <summary>
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/// 在注册 region 之前清理宿主控件与 RegionManager 中可能残留的 region。
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/// 这一步是防止 Prism 在 adapt 时因为 ContentControl.Content 非空而抛异常。
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/// </summary>
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private void PrepareRegionForRegistration()
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{
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try
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{
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// 如果 RegionManager 中已存在同名 region，则先移除它（并 RemoveAll 内容）
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if (_regionManager != null && _regionManager.Regions.ContainsRegionWithName(RegionName))
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{
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try
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{
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var existing = _regionManager.Regions[RegionName];
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existing.RemoveAll();
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_regionManager.Regions.Remove(RegionName);
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Debug.WriteLine($"已移除旧 region: {RegionName}");
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"移除旧 region 发生异常: {ex.Message}");
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}
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}
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// 如果宿主 ContentControl 已经有内容，清空它（很关键）
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if (PART_ContentHost != null && PART_ContentHost.Content != null)
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{
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Debug.WriteLine($"清空 PART_ContentHost.Content (原内容类型: {PART_ContentHost.Content.GetType().Name})");
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PART_ContentHost.Content = null;
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"PrepareRegionForRegistration 异常: {ex.Message}");
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}
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}
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private void TabContentView_Unloaded(object sender, RoutedEventArgs e)
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{
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try
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{
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// 取消挂起导航
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if (_pendingNavigationOp != null && _pendingNavigationOp.Status == DispatcherOperationStatus.Pending)
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{
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_pendingNavigationOp.Abort();
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_pendingNavigationOp = null;
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}
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// 清理 region 与宿主内容
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if (!string.IsNullOrWhiteSpace(RegionName))
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{
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var rm = _regionManager ?? ContainerLocator.Current.Resolve<IRegionManager>();
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try
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{
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if (rm != null && rm.Regions.ContainsRegionWithName(RegionName))
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{
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var region = rm.Regions[RegionName];
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region.RemoveAll();
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rm.Regions.Remove(RegionName);
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Debug.WriteLine($"卸载并移除 region: {RegionName}");
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"TabContentView_Unloaded 清理 region 异常: {ex.Message}");
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}
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}
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if (PART_ContentHost != null && PART_ContentHost.Content != null)
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{
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PART_ContentHost.Content = null;
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Debug.WriteLine($"Unloaded: 清空 PART_ContentHost.Content");
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"TabContentView_Unloaded 清理异常: {ex.Message}");
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}
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finally
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{
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_navigated = false;
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}
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}
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private static void OnRegionOrViewNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is TabContentView tc)
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{
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// 新参数到来，允许再次导航
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tc._navigated = false;
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// 取消旧挂起导航
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if (tc._pendingNavigationOp != null && tc._pendingNavigationOp.Status == DispatcherOperationStatus.Pending)
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{
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tc._pendingNavigationOp.Abort();
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tc._pendingNavigationOp = null;
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}
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// 尝试导航（这一调用会在 Loaded/可见时真正执行）
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tc.EnsureNavigateIfNeeded();
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}
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}
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}
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}
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