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