功能更新
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265
Melskin/Assists/BehaviorAssist.cs
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265
Melskin/Assists/BehaviorAssist.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Controls.Primitives;
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using System.Windows.Input;
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using System.Windows.Media.Animation;
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using Melskin.Controls;
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using Melskin.Extensions;
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namespace Melskin.Assists
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{
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/// <summary>
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/// 控件行为的附加属性类
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/// </summary>
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public class BehaviorAssist
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{
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#region Popup
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/// <summary>
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/// 表示是否使 Popup 控件模拟原生平台的弹出行为。当设置为 true 时，Popup 将会在用户点击外部区域或窗口失去焦点时自动关闭，从而提供更接近于原生应用程序的用户体验。
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/// </summary>
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public static readonly DependencyProperty SimulateNativeBehaviorProperty =
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DependencyProperty.RegisterAttached(
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"SimulateNativeBehavior", typeof(bool), typeof(BehaviorAssist),
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new PropertyMetadata(false, OnSimulateNativeBehaviorChanged));
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/// <summary>
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///
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/// </summary>
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/// <param name="element"></param>
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/// <param name="value"></param>
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public static void SetSimulateNativeBehavior(DependencyObject element, bool value) => element.SetValue(SimulateNativeBehaviorProperty, value);
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/// <summary>
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///
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/// </summary>
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/// <param name="element"></param>
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/// <returns></returns>
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[AttachedPropertyBrowsableForType(typeof(ColorPicker))]
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[AttachedPropertyBrowsableForType(typeof(AutoComplete))]
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[AttachedPropertyBrowsableForType(typeof(Cascader))]
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[AttachedPropertyBrowsableForType(typeof(ComboBox))]
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[AttachedPropertyBrowsableForType(typeof(DatePicker))]
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[AttachedPropertyBrowsableForType(typeof(MultiComboBox))]
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[AttachedPropertyBrowsableForType(typeof(TimePicker))]
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public static bool GetSimulateNativeBehavior(DependencyObject element) => (bool)element.GetValue(SimulateNativeBehaviorProperty);
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// 私有状态属性的定义保持不变
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private static readonly DependencyProperty PreviewMouseDownHandlerProperty =
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DependencyProperty.RegisterAttached("PreviewMouseDownHandler", typeof(MouseButtonEventHandler), typeof(BehaviorAssist));
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private static readonly DependencyProperty WindowEventHandlerProperty =
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DependencyProperty.RegisterAttached("WindowEventHandler", typeof(EventHandler), typeof(BehaviorAssist));
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private static readonly DependencyProperty PreviewMouseWheelHandlerProperty =
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DependencyProperty.RegisterAttached("PreviewMouseWheelHandler", typeof(MouseWheelEventHandler), typeof(BehaviorAssist));
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private static void OnSimulateNativeBehaviorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is not Popup popup) return;
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if ((bool)e.NewValue)
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{
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popup.Opened += OnPopupOpened;
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popup.Closed += OnPopupClosed;
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}
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else
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{
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popup.Opened -= OnPopupOpened;
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popup.Closed -= OnPopupClosed;
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}
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}
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private static void OnPopupOpened(object? sender, EventArgs e)
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{
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if (sender is not Popup popup || !GetSimulateNativeBehavior(popup)) return;
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var window = Window.GetWindow(popup);
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if (window == null) return;
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// 【防御性编程】在添加任何处理器之前，先执行一次清理，防止因竞争条件导致的泄漏。
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CleanupHandlers(popup, window);
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// --- 添加自动关闭逻辑 ---
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EventHandler windowEventHandler = (_, _) =>
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{
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popup.Dispatcher.BeginInvoke(new Action(() => { popup.IsOpen = false; }));
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};
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popup.SetValue(WindowEventHandlerProperty, windowEventHandler);
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window.Deactivated += windowEventHandler;
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window.LocationChanged += windowEventHandler;
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// --- 添加鼠标点击外部逻辑 ---
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MouseButtonEventHandler mouseDownHandler = (_, _) =>
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{
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if (popup.IsMouseOver || popup.PlacementTarget is { IsMouseOver: true })
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{
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return;
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}
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popup.IsOpen = false;
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};
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popup.SetValue(PreviewMouseDownHandlerProperty, mouseDownHandler);
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window.AddHandler(UIElement.PreviewMouseDownEvent, mouseDownHandler, true);
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// --- 添加鼠标滚轮拦截逻辑 ---
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MouseWheelEventHandler mouseWheelHandler = (_, args) =>
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{
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if (!popup.IsMouseOver)
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{
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args.Handled = true;
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}
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};
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popup.SetValue(PreviewMouseWheelHandlerProperty, mouseWheelHandler);
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window.AddHandler(UIElement.PreviewMouseWheelEvent, mouseWheelHandler, true);
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}
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private static void OnPopupClosed(object? sender, EventArgs e)
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{
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if (sender is not Popup popup || !GetSimulateNativeBehavior(popup)) return;
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var window = Window.GetWindow(popup);
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// 窗口可能在Popup关闭时已经不存在了
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if (window != null)
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{
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CleanupHandlers(popup, window);
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}
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}
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/// <summary>
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/// 【新增】一个集中的清理方法，确保所有附加的处理器都被移除。
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/// </summary>
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private static void CleanupHandlers(Popup popup, Window window)
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{
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if (popup.GetValue(WindowEventHandlerProperty) is EventHandler windowEventHandler)
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{
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window.Deactivated -= windowEventHandler;
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window.LocationChanged -= windowEventHandler;
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popup.ClearValue(WindowEventHandlerProperty);
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}
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if (popup.GetValue(PreviewMouseDownHandlerProperty) is MouseButtonEventHandler mouseDownHandler)
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{
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window.RemoveHandler(UIElement.PreviewMouseDownEvent, mouseDownHandler);
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popup.ClearValue(PreviewMouseDownHandlerProperty);
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}
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if (popup.GetValue(PreviewMouseWheelHandlerProperty) is MouseWheelEventHandler mouseWheelHandler)
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{
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window.RemoveHandler(UIElement.PreviewMouseWheelEvent, mouseWheelHandler);
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popup.ClearValue(PreviewMouseWheelHandlerProperty);
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}
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}
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#endregion
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#region ListBox
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/// <summary>
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/// 获取指定对象的滑动动画启用状态。
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/// </summary>
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/// <param name="obj">要获取属性值的对象。</param>
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/// <returns>如果为 true，则表示启用了滑动动画；否则为 false。</returns>
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[AttachedPropertyBrowsableForType(typeof(ListBox))]
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public static bool GetEnableSlideAnimation(DependencyObject obj)
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{
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return (bool)obj.GetValue(EnableSlideAnimationProperty);
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}
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/// <summary>
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/// 设置指定对象的滑动动画启用状态。
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/// </summary>
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/// <param name="obj">要设置属性值的对象。</param>
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/// <param name="value">一个布尔值，表示是否启用滑动动画。如果为 true，则启用滑动动画；否则不启用。</param>
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public static void SetEnableSlideAnimation(DependencyObject obj, bool value)
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{
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obj.SetValue(EnableSlideAnimationProperty, value);
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}
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/// <summary>
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/// 用于控制 ListBox 控件是否启用滑动动画效果的依赖属性。通过设置此属性，可以为 ListBox 添加平滑的滑动过渡效果，从而增强用户体验。
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/// </summary>
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public static readonly DependencyProperty EnableSlideAnimationProperty =
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DependencyProperty.RegisterAttached("EnableSlideAnimation", typeof(bool), typeof(BehaviorAssist), new PropertyMetadata(false, OnEnableSlideAnimationChanged));
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private static void OnEnableSlideAnimationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is not ListBox listBox) return;
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if ((bool)e.NewValue)
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{
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listBox.Loaded += ListBox_Loaded;
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listBox.SelectionChanged += ListBox_SelectionChanged;
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}
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else
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{
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listBox.Loaded -= ListBox_Loaded;
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listBox.SelectionChanged -= ListBox_SelectionChanged;
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}
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}
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private static void ListBox_Loaded(object sender, RoutedEventArgs e)
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{
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if (sender is ListBox listBox && listBox.IsVisible)
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{
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UpdateIndicator(listBox, false);
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}
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}
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private static void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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if (sender is ListBox { IsLoaded: true } listBox)
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{
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UpdateIndicator(listBox, true);
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}
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}
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private static void UpdateIndicator(ListBox? listBox, bool useAnimation)
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{
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if (listBox?.SelectedItem == null) return;
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var indicator = listBox.Template.FindName("PART_SelectionIndicator", listBox) as FrameworkElement;
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var itemsPresenter = listBox.FindVisualChild<ItemsPresenter>();
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if (indicator == null || itemsPresenter == null) return;
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var selectedItemUI = listBox.ItemContainerGenerator.ContainerFromItem(listBox.SelectedItem) as FrameworkElement;
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if (selectedItemUI == null) return;
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var position = selectedItemUI.TransformToAncestor(itemsPresenter).Transform(new Point(0, 0));
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indicator.Width = selectedItemUI.ActualWidth;
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indicator.Height = selectedItemUI.ActualHeight;
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var transform = indicator.RenderTransform as TranslateTransform;
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// 如果 transform 为 null，或者它是一个被冻结的（只读）实例，
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// 那么我们就需要创建一个新的、可写的实例来替换它。
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if (transform == null || transform.IsFrozen)
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{
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transform = new TranslateTransform();
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indicator.RenderTransform = transform;
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}
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if (useAnimation)
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{
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var animationX = new DoubleAnimation(position.X, new Duration(TimeSpan.FromMilliseconds(300)))
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{
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EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
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};
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var animationY = new DoubleAnimation(position.Y, new Duration(TimeSpan.FromMilliseconds(300)))
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{
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EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
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};
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transform.BeginAnimation(TranslateTransform.XProperty, animationX);
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transform.BeginAnimation(TranslateTransform.YProperty, animationY);
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}
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else
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{
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// 现在 transform 保证是可写的，所以这里不会再抛出异常
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transform.X = position.X;
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transform.Y = position.Y;
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}
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}
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#endregion
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}
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}
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