496 lines
18 KiB
C#
496 lines
18 KiB
C#
using Microsoft.Office.Interop.PowerPoint;
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Security.Cryptography;
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using System.Text;
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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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/// PPT墨迹管理器 - 负责按幻灯片保存/加载墨迹、自动保存与内存管理。
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/// </summary>
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public class PPTInkManager : IDisposable
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{
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#region Properties
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public bool IsAutoSaveEnabled { get; set; } = true;
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public string AutoSaveLocation { get; set; } = "";
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public StrokeCollection CurrentStrokes { get; private set; } = new StrokeCollection();
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#endregion
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#region Private Fields
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private MemoryStream[] _memoryStreams;
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private const int DefaultMaxSlides = 100;
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private int _maxSlides = DefaultMaxSlides;
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private string _currentPresentationId = "";
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private readonly object _lockObject = new object();
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private bool _disposed;
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// 墨迹锁定机制，防止翻页时的墨迹冲突
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private DateTime _inkLockUntil = DateTime.MinValue;
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private int _lockedSlideIndex = -1;
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private const int InkLockMilliseconds = 500;
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// 添加快速切换保护机制
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private DateTime _lastSwitchTime = DateTime.MinValue;
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private int _lastSwitchSlideIndex = -1;
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private const int MinSwitchIntervalMs = 100;
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private long _totalMemoryUsage;
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private const long MaxMemoryUsageBytes = 100 * 1024 * 1024; // 100MB
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private DateTime _lastMemoryCleanup = DateTime.MinValue;
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private const int MemoryCleanupIntervalMinutes = 5;
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private const string StrokeFileExtension = ".icstk";
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#endregion
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#region Constructor
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public PPTInkManager()
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{
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InitializeMemoryStreams(DefaultMaxSlides + 2);
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}
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private void InitializeMemoryStreams(int capacity)
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{
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_memoryStreams = new MemoryStream[Math.Max(2, capacity)];
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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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/// 初始化新的演示文稿
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/// </summary>
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public void InitializePresentation(Presentation presentation)
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{
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if (presentation == null) return;
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lock (_lockObject)
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{
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try
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{
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ClearAllStrokesInternal();
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_inkLockUntil = DateTime.MinValue;
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_lockedSlideIndex = -1;
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_lastSwitchSlideIndex = -1;
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_lastSwitchTime = DateTime.MinValue;
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_currentPresentationId = GeneratePresentationId(presentation);
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int slideCount = 0;
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try
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{
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slideCount = presentation.Slides.Count;
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}
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catch (COMException comEx)
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{
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uint hr = (uint)comEx.HResult;
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if (hr == 0x80048010) return;
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throw;
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}
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int capacity = slideCount + 2;
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_maxSlides = Math.Max(_maxSlides, slideCount);
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_memoryStreams = new MemoryStream[capacity];
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if (IsAutoSaveEnabled && !string.IsNullOrEmpty(AutoSaveLocation))
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LoadSavedStrokes();
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"初始化演示文稿墨迹管理失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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/// <summary>
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/// 保存当前页面的墨迹
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/// </summary>
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public void SaveCurrentSlideStrokes(int slideIndex, StrokeCollection strokes)
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{
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if (slideIndex <= 0 || strokes == null) return;
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lock (_lockObject)
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{
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try
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{
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if (!CanWriteInk(slideIndex)) return;
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if (slideIndex >= _memoryStreams.Length) return;
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ReplaceSlideStream(slideIndex, strokes);
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CheckAndPerformMemoryCleanup();
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"保存第{slideIndex}页墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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/// <summary>
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/// 强制保存指定页墨迹到内存（不受锁定限制）。用于放映结束前保存当前画布到当前页。
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/// </summary>
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public void ForceSaveSlideStrokes(int slideIndex, StrokeCollection strokes)
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{
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if (slideIndex <= 0 || strokes == null) return;
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lock (_lockObject)
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{
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try
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{
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if (slideIndex >= _memoryStreams.Length) return;
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ReplaceSlideStream(slideIndex, strokes);
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LogHelper.WriteLogToFile($"已强制保存第{slideIndex}页墨迹", LogHelper.LogType.Trace);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"强制保存第{slideIndex}页墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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/// <summary>
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/// 加载指定页面的墨迹
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/// </summary>
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public StrokeCollection LoadSlideStrokes(int slideIndex)
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{
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if (slideIndex <= 0) return new StrokeCollection();
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lock (_lockObject)
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{
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try
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{
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if (slideIndex < _memoryStreams.Length && _memoryStreams[slideIndex] != null && _memoryStreams[slideIndex].Length > 0)
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{
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_memoryStreams[slideIndex].Position = 0;
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return new StrokeCollection(_memoryStreams[slideIndex]);
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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($"加载第{slideIndex}页墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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return new StrokeCollection();
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}
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/// <summary>
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/// 切换到指定页面并加载墨迹
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/// </summary>
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public StrokeCollection SwitchToSlide(int slideIndex, StrokeCollection currentStrokes = null)
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{
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lock (_lockObject)
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{
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try
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{
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var now = DateTime.Now;
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if (now - _lastSwitchTime < TimeSpan.FromMilliseconds(MinSwitchIntervalMs) && _lastSwitchSlideIndex == slideIndex)
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{
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LogHelper.WriteLogToFile($"快速切换保护：忽略重复请求 页{slideIndex}", LogHelper.LogType.Trace);
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return LoadSlideStrokes(slideIndex);
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}
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LockInkForSlide(slideIndex);
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StrokeCollection newStrokes = LoadSlideStrokes(slideIndex);
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_lastSwitchTime = now;
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_lastSwitchSlideIndex = slideIndex;
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return newStrokes;
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"切换到第{slideIndex}页失败: {ex}", LogHelper.LogType.Error);
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return new StrokeCollection();
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}
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}
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}
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/// <summary>
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/// 保存所有墨迹到文件
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/// </summary>
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/// <param name="presentation">演示文稿对象</param>
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/// <param name="currentSlideIndex">当前播放的页码，如果提供则使用此值保存位置，否则使用_lockedSlideIndex</param>
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public void SaveAllStrokesToFile(Presentation presentation, int currentSlideIndex = -1)
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{
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if (!IsAutoSaveEnabled || string.IsNullOrEmpty(AutoSaveLocation) || presentation == null) return;
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lock (_lockObject)
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{
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try
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{
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string folderPath = GetPresentationFolderPath();
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if (!Directory.Exists(folderPath))
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Directory.CreateDirectory(folderPath);
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int positionToSave = currentSlideIndex > 0 ? currentSlideIndex : (_lockedSlideIndex > 0 ? _lockedSlideIndex : _lastSwitchSlideIndex);
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if (positionToSave > 0)
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{
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try { File.WriteAllText(Path.Combine(folderPath, "Position"), positionToSave.ToString()); }
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catch (Exception ex) { LogHelper.WriteLogToFile($"保存 Position 失败: {ex}", LogHelper.LogType.Warning); }
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}
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int slideCount = 0;
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try { slideCount = presentation.Slides.Count; }
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catch (COMException comEx)
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{
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if ((uint)comEx.HResult == 0x80048010) return;
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throw;
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}
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for (int i = 1; i <= slideCount && i < _memoryStreams.Length; i++)
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{
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if (_memoryStreams[i] == null) continue;
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try
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{
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if (_memoryStreams[i].Length > 8)
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{
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_memoryStreams[i].Position = 0;
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byte[] buf = new byte[_memoryStreams[i].Length];
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int read = _memoryStreams[i].Read(buf, 0, buf.Length);
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if (read > 0)
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{
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string basePath = Path.Combine(folderPath, i.ToString("0000"));
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File.WriteAllBytes(basePath + StrokeFileExtension, buf);
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}
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}
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else
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{
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TryDeleteStrokeFile(folderPath, i);
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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($"保存第{i}页墨迹到文件失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"保存墨迹到文件失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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/// <summary>
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/// 从文件加载已保存的墨迹
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/// </summary>
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public void LoadSavedStrokes()
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{
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if (!IsAutoSaveEnabled || string.IsNullOrEmpty(AutoSaveLocation)) return;
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lock (_lockObject)
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{
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try
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{
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string folderPath = GetPresentationFolderPath();
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if (!Directory.Exists(folderPath)) return;
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var dir = new DirectoryInfo(folderPath);
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int loadedCount = 0;
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foreach (FileInfo file in dir.GetFiles("*" + StrokeFileExtension))
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{
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string nameWithoutExt = Path.GetFileNameWithoutExtension(file.Name);
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if (!int.TryParse(nameWithoutExt, out int slideIndex) || slideIndex <= 0) continue;
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if (slideIndex >= _memoryStreams.Length) continue;
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try
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{
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byte[] bytes = File.ReadAllBytes(file.FullName);
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if (bytes.Length > 8)
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{
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_memoryStreams[slideIndex] = new MemoryStream(bytes);
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_memoryStreams[slideIndex].Position = 0;
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loadedCount++;
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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($"加载墨迹文件 {file.Name} 失败: {ex}", LogHelper.LogType.Error);
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}
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}
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if (loadedCount > 0)
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LogHelper.WriteLogToFile($"已从磁盘加载 {loadedCount} 页墨迹", LogHelper.LogType.Trace);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"从文件加载墨迹失败: {ex}", LogHelper.LogType.Error);
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}
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}
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}
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/// <summary>
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/// 清除所有墨迹
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/// </summary>
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public void ClearAllStrokes()
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{
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lock (_lockObject)
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{
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ClearAllStrokesInternal();
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}
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}
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public void LockInkForSlide(int slideIndex)
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{
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_inkLockUntil = DateTime.Now.AddMilliseconds(InkLockMilliseconds);
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_lockedSlideIndex = slideIndex;
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}
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public bool CanWriteInk(int currentSlideIndex)
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{
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if (DateTime.Now >= _inkLockUntil) return true;
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if (currentSlideIndex == _lockedSlideIndex) return true;
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if (DateTime.Now - (_inkLockUntil.AddMilliseconds(-InkLockMilliseconds)) < TimeSpan.FromMilliseconds(50)) return true;
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return false;
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}
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public void ResetLockState()
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{
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lock (_lockObject)
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{
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_inkLockUntil = DateTime.MinValue;
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_lockedSlideIndex = -1;
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_lastSwitchTime = DateTime.MinValue;
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_lastSwitchSlideIndex = -1;
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}
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}
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#endregion
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#region Private Helpers
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private void ClearAllStrokesInternal()
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{
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if (_memoryStreams != null)
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{
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for (int i = 0; i < _memoryStreams.Length; i++)
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{
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try { _memoryStreams[i]?.Dispose(); } catch (Exception ex) { LogHelper.WriteLogToFile($"释放内存流 {i} 失败: {ex}", LogHelper.LogType.Warning); }
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finally { _memoryStreams[i] = null; }
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}
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_memoryStreams = new MemoryStream[_maxSlides + 2];
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}
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CurrentStrokes?.Clear();
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LogHelper.WriteLogToFile("已清除所有墨迹", LogHelper.LogType.Trace);
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}
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private void ReplaceSlideStream(int slideIndex, StrokeCollection strokes)
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{
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try { _memoryStreams[slideIndex]?.Dispose(); } catch (Exception ex) { LogHelper.WriteLogToFile($"释放旧内存流失败: {ex}", LogHelper.LogType.Warning); }
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var ms = new MemoryStream();
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strokes.Save(ms);
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ms.Position = 0;
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_memoryStreams[slideIndex] = ms;
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}
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private void TryDeleteStrokeFile(string folderPath, int slideIndex)
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{
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try
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{
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string path = Path.Combine(folderPath, slideIndex.ToString("0000") + StrokeFileExtension);
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if (File.Exists(path)) File.Delete(path);
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}
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catch { }
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}
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private void CheckAndPerformMemoryCleanup()
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{
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try
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{
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var now = DateTime.Now;
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if (now - _lastMemoryCleanup < TimeSpan.FromMinutes(MemoryCleanupIntervalMinutes)) return;
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long currentMemoryUsage = 0;
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if (_memoryStreams != null)
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{
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for (int i = 0; i < _memoryStreams.Length; i++)
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if (_memoryStreams[i] != null) currentMemoryUsage += _memoryStreams[i].Length;
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}
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_totalMemoryUsage = currentMemoryUsage;
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if (currentMemoryUsage > MaxMemoryUsageBytes)
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{
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LogHelper.WriteLogToFile($"墨迹内存超限 ({currentMemoryUsage / (1024 * 1024)}MB)，执行清理", LogHelper.LogType.Warning);
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CleanupInactiveSlideStrokes();
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}
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_lastMemoryCleanup = now;
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"内存清理检查失败: {ex}", LogHelper.LogType.Error);
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}
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}
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private void CleanupInactiveSlideStrokes()
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{
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if (_memoryStreams == null) return;
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int cleaned = 0;
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long freed = 0;
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for (int i = 0; i < _memoryStreams.Length; i++)
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{
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if (i == _lockedSlideIndex || i == _lastSwitchSlideIndex) continue;
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if (_memoryStreams[i] != null)
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{
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long len = _memoryStreams[i].Length;
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try { _memoryStreams[i].Dispose(); freed += len; cleaned++; } catch { }
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finally { _memoryStreams[i] = null; }
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}
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}
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if (cleaned > 0)
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LogHelper.WriteLogToFile($"已清理 {cleaned} 页墨迹，释放 {freed / 1024}KB", LogHelper.LogType.Trace);
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}
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private string GeneratePresentationId(Presentation presentation)
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{
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try
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{
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string path = presentation.FullName;
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string hash = GetFileHash(path);
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return $"{presentation.Name}_{presentation.Slides.Count}_{hash}";
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"生成演示文稿 ID 失败: {ex}", LogHelper.LogType.Error);
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return $"unknown_{DateTime.Now.Ticks}";
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}
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}
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private static string GetFileHash(string filePath)
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{
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try
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{
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if (string.IsNullOrEmpty(filePath)) return "unknown";
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using (var md5 = MD5.Create())
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{
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byte[] hash = md5.ComputeHash(Encoding.UTF8.GetBytes(filePath));
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return BitConverter.ToString(hash).Replace("-", "").Substring(0, 8);
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}
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"计算文件哈希失败: {ex}", LogHelper.LogType.Error);
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return "error";
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}
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}
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private string GetPresentationFolderPath()
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{
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return Path.Combine(AutoSaveLocation, "Auto Saved - Presentations", _currentPresentationId);
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}
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#endregion
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#region Dispose
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public void Dispose()
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{
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if (_disposed) return;
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lock (_lockObject) { ClearAllStrokesInternal(); }
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_disposed = true;
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}
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#endregion
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}
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}
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