improve:issue #112
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@@ -0,0 +1,264 @@
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using System;
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using System.Collections.Generic;
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using System.Windows;
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using System.Windows.Media.Animation;
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using System.Windows.Threading;
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using System.Windows.Ink;
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namespace Ink_Canvas.Helpers
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{
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/// <summary>
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/// 墨迹渐隐管理器 - 管理墨迹的渐隐动画和状态
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/// </summary>
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public class InkFadeManager
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{
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#region Properties
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/// <summary>
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/// 是否启用墨迹渐隐功能
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/// </summary>
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public bool IsEnabled { get; set; } = false;
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/// <summary>
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/// 墨迹渐隐时间（毫秒）
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/// </summary>
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public int FadeTime { get; set; } = 3000;
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/// <summary>
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/// 渐隐动画持续时间（毫秒）
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/// </summary>
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public int AnimationDuration { get; set; } = 1000;
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#endregion
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#region Private Fields
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private readonly MainWindow _mainWindow;
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private readonly Dispatcher _dispatcher;
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private readonly Dictionary<Stroke, DispatcherTimer> _fadeTimers;
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private readonly Dictionary<Stroke, UIElement> _strokeVisuals;
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#endregion
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#region Constructor
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public InkFadeManager(MainWindow mainWindow)
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{
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_mainWindow = mainWindow ?? throw new ArgumentNullException(nameof(mainWindow));
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_dispatcher = _mainWindow.Dispatcher;
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_fadeTimers = new Dictionary<Stroke, DispatcherTimer>();
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_strokeVisuals = new Dictionary<Stroke, UIElement>();
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// 添加需要渐隐的墨迹
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/// </summary>
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/// <param name="stroke">墨迹对象</param>
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/// <param name="visual">墨迹的视觉元素</param>
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public void AddFadingStroke(Stroke stroke, UIElement visual)
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{
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if (!IsEnabled || stroke == null || visual == null) return;
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try
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{
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// 记录墨迹和视觉元素的对应关系
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_strokeVisuals[stroke] = visual;
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// 创建定时器，在指定时间后开始渐隐动画
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var timer = new DispatcherTimer
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{
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Interval = TimeSpan.FromMilliseconds(FadeTime)
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};
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timer.Tick += (sender, e) =>
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{
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StartFadeAnimation(stroke);
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timer.Stop();
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_fadeTimers.Remove(stroke);
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};
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_fadeTimers[stroke] = timer;
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timer.Start();
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// 将视觉元素添加到画布上
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_dispatcher.InvokeAsync(() =>
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{
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try
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{
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if (_mainWindow.inkCanvas != null)
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{
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_mainWindow.inkCanvas.Children.Add(visual);
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}
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"添加墨迹视觉元素到画布失败: {ex}", LogHelper.LogType.Error);
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}
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});
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"添加渐隐墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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/// <summary>
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/// 移除墨迹
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/// </summary>
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/// <param name="stroke">要移除的墨迹</param>
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public void RemoveStroke(Stroke stroke)
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{
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if (stroke == null) return;
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try
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{
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if (_fadeTimers.TryGetValue(stroke, out var timer))
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{
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timer.Stop();
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_fadeTimers.Remove(stroke);
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}
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if (_strokeVisuals.TryGetValue(stroke, out var visual))
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{
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_dispatcher.InvokeAsync(() =>
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{
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try
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{
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if (_mainWindow.inkCanvas != null && _mainWindow.inkCanvas.Children.Contains(visual))
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{
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_mainWindow.inkCanvas.Children.Remove(visual);
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}
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"从画布移除墨迹视觉元素失败: {ex}", LogHelper.LogType.Error);
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}
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});
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_strokeVisuals.Remove(stroke);
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}
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"移除渐隐墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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/// <summary>
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/// 清除所有渐隐墨迹
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/// </summary>
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public void ClearAllFadingStrokes()
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{
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try
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{
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foreach (var timer in _fadeTimers.Values)
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{
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timer.Stop();
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}
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_fadeTimers.Clear();
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_dispatcher.InvokeAsync(() =>
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{
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try
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{
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if (_mainWindow.inkCanvas != null)
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{
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foreach (var visual in _strokeVisuals.Values)
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{
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if (_mainWindow.inkCanvas.Children.Contains(visual))
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{
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_mainWindow.inkCanvas.Children.Remove(visual);
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}
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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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LogHelper.WriteLogToFile($"清除所有墨迹视觉元素失败: {ex}", LogHelper.LogType.Error);
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}
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});
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_strokeVisuals.Clear();
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"清除所有渐隐墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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/// <summary>
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/// 更新渐隐时间设置
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/// </summary>
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/// <param name="fadeTime">新的渐隐时间（毫秒）</param>
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public void UpdateFadeTime(int fadeTime)
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{
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FadeTime = fadeTime;
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foreach (var kvp in _fadeTimers)
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{
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var stroke = kvp.Key;
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var timer = kvp.Value;
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timer.Stop();
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timer.Interval = TimeSpan.FromMilliseconds(FadeTime);
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timer.Start();
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}
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}
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/// <summary>
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/// 更新动画持续时间设置
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/// </summary>
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/// <param name="animationDuration">新的动画持续时间（毫秒）</param>
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public void UpdateAnimationDuration(int animationDuration)
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{
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AnimationDuration = animationDuration;
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}
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#endregion
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#region Private Methods
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/// <summary>
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/// 开始渐隐动画
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/// </summary>
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/// <param name="stroke">要渐隐的墨迹</param>
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private void StartFadeAnimation(Stroke stroke)
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{
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if (!_strokeVisuals.TryGetValue(stroke, out var visual)) return;
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try
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{
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_dispatcher.InvokeAsync(() =>
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{
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var fadeAnimation = new DoubleAnimation
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{
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From = 1.0,
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To = 0.0,
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Duration = TimeSpan.FromMilliseconds(AnimationDuration),
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EasingFunction = new CubicEase { EasingMode = EasingMode.EaseInOut }
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};
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fadeAnimation.Completed += (sender, e) =>
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{
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try
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{
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if (_mainWindow.inkCanvas != null && _mainWindow.inkCanvas.Children.Contains(visual))
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{
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_mainWindow.inkCanvas.Children.Remove(visual);
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}
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RemoveStroke(stroke);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"渐隐动画完成后清理墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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};
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visual.BeginAnimation(UIElement.OpacityProperty, fadeAnimation);
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});
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"开始渐隐动画失败: {ex}", LogHelper.LogType.Error);
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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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