private static void HandleCancellation(CreateCollageAsyncContext context, ref bool isCancelled)
{
if (context != null)
{
if (context.IsCancelling)
{
isCancelled = true;
}
}
}
public void CreateAsync()
{
var worker = new CreateTaskWorkerDelegate(CreateCollage);
var completedCallback = new AsyncCallback(CreateTaskCompletedCallback);
lock (this.sync)
{
if (this.isBusy)
{
throw new InvalidOperationException("The engine is currently busy.");
}
AsyncOperation async = AsyncOperationManager.CreateOperation(null);
var context = new CreateCollageAsyncContext();
bool cancelled;
worker.BeginInvoke(async, context, out cancelled, completedCallback, async);
this.isBusy = true;
this.createTaskContext = context;
}
}
private void CreateCollage(AsyncOperation async, CreateCollageAsyncContext context, out bool isCancelled)
{
isCancelled = false;
using (var bitmapCollage = new Bitmap(this.settings.Dimensions.TotalWidth, this.settings.Dimensions.TotalHeight))
{
using (Graphics graphics = bitmapCollage.CreateGraphics())
{
for (int rowsCounter = 0; rowsCounter < this.settings.Dimensions.NumberOfRows; rowsCounter++)
{
for (int colsCounter = 0; colsCounter < this.settings.Dimensions.NumberOfColumns; colsCounter++)
{
this.ReportProgress(async, colsCounter, rowsCounter);
HandleCancellation(context, ref isCancelled);
DrawTile(graphics, colsCounter, rowsCounter);
}
}
}
this.collageSaver.Save(bitmapCollage);
}
}