/// <summary>
/// Initializes a new instance of the <see cref="HistoryItem"/> class.
/// </summary>
/// <param name="file">The backing file.</param>
/// <param name="historyCanvas">The history canvas.</param>
/// <param name="currentImage">The current image.</param>
public HistoryItem(string file, CanvasHistoryState historyCanvas, BitmapSource currentImage)
{
backingFile = file;
state = HistoryItemState.Memory;
chunk = new HistoryChunk(historyCanvas, currentImage);
ToDisk();
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
if (!disposed)
{
disposed = true;
if (canvas != null)
{
canvas.Dispose();
canvas = null;
}
}
}
/// <summary>
/// Adds the history item to the undo stack.
/// </summary>
/// <param name="historyState">The current <see cref="HostTest.CanvasHistoryState"/>.</param>
/// <param name="image">The current destination image.</param>
public void AddHistoryItem(CanvasHistoryState historyState, BitmapSource image)
{
if (index < (historyList.Count - 1))
{
historyList.RemoveRange(index + 1, (historyList.Count - 1) - index);
}
historyList.Add(new HistoryItem(tempDirectory.GetRandomFileName(), historyState, image));
index = historyList.Count - 1;
OnHistoryChanged();
}
private HistoryChunk(SerializationInfo info, StreamingContext context)
{
canvas = (CanvasHistoryState)info.GetValue("canvas", typeof(CanvasHistoryState));
byte[] temp = (byte[])info.GetValue("image", typeof(byte[]));
using (MemoryStream stream = new MemoryStream(temp))
{
BitmapFrame frame = BitmapFrame.Create(stream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
image = new WriteableBitmap(frame); // Copy the frame using a WriteableBitmap to fix the threading issue with the BitmapFrameDecoder.
image.Freeze();
}
}
public HistoryChunk(CanvasHistoryState canvasHistory, BitmapSource source)
{
canvas = canvasHistory;
image = source;
disposed = false;
}
/// <summary>
/// Copies the CanvasHistoryState data to the canvas.
/// </summary>
/// <param name="historyState">The CanvasHistoryState to copy.</param>
public void CopyFromHistoryState(CanvasHistoryState historyState)
{
Surface = historyState.Image;
RenderSelection(path, false);
}
