private void OnButtonClick(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
if (button.Name == "PreImageButton")
{
currentState = ImagePreviewState.Pre;
}
else if (button.Name == "NextImageButton")
{
currentState = ImagePreviewState.Next;
}
else if (button.Name == "PreTiffButton")
{
currentState = ImagePreviewState.TiffState;
currentTiffState = ImagePreviewTiffState.TiffPre;
}
else if (button.Name == "NextTiffButton")
{
currentState = ImagePreviewState.TiffState;
currentTiffState = ImagePreviewTiffState.TiffNext;
}
Update();
}
public void Update()
{
while (currentState != ImagePreviewState.Finalize)
{
switch (currentState)
{
case ImagePreviewState.Init:
listCount = 0;
currentListIndex = 0;
TiffCount = 0;
currentTiffIndex = 0;
if (imagePaths != null)
{
listCount = imagePaths.Count();
if (listCount == 0)
{
currentState = ImagePreviewState.Unvalid;
}
else
{
currentState = ImagePreviewState.Ready;
}
}
else
{
currentState = ImagePreviewState.Unvalid;
}
break;
case ImagePreviewState.Ready:
PreImageButton.Visibility = System.Windows.Visibility.Hidden;
NextImageButton.Visibility = System.Windows.Visibility.Hidden;
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
CurrentFileName = System.IO.Path.GetFileName(imagePaths[currentListIndex]);
currentFileExt = System.IO.Path.GetExtension(imagePaths[currentListIndex]).ToLower();
ImageView.Visibility = System.Windows.Visibility.Visible;
ImageUnvalid.Visibility = System.Windows.Visibility.Hidden;
if (listCount == 1)
{
currentState = ImagePreviewState.OnePage;
}
else
{
if (currentListIndex == 0)
{
currentState = ImagePreviewState.First;
}
else if (currentListIndex == listCount - 1)
{
currentState = ImagePreviewState.Last;
}
else
{
currentState = ImagePreviewState.Middle;
}
}
break;
case ImagePreviewState.First:
PreImageButton.Visibility = System.Windows.Visibility.Hidden;
NextImageButton.Visibility = System.Windows.Visibility.Visible;
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
currentState = ImagePreviewState.CheckExt;
break;
case ImagePreviewState.Middle:
PreImageButton.Visibility = System.Windows.Visibility.Visible;
NextImageButton.Visibility = System.Windows.Visibility.Visible;
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
currentState = ImagePreviewState.CheckExt;
break;
case ImagePreviewState.Last:
PreImageButton.Visibility = System.Windows.Visibility.Visible;
NextImageButton.Visibility = System.Windows.Visibility.Hidden;
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
currentState = ImagePreviewState.CheckExt;
break;
case ImagePreviewState.OnePage:
PreImageButton.Visibility = System.Windows.Visibility.Hidden;
NextImageButton.Visibility = System.Windows.Visibility.Hidden;
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
currentState = ImagePreviewState.CheckExt;
break;
case ImagePreviewState.CheckExt:
if (currentFileExt == ".tif")
{
currentTiffIndex = 0;
currentState = ImagePreviewState.TiffState;
currentTiffState = ImagePreviewTiffState.TiffReady;
}
else if (currentFileExt == ".jpg" || currentFileExt == ".bmp" || currentFileExt == ".png")
{
currentState = ImagePreviewState.Render;
}
else
{
currentState = ImagePreviewState.Unvalid;
}
break;
case ImagePreviewState.Render:
// bool IsFitted = false;
if (File.Exists(imagePaths[currentListIndex]))
{
BitmapSource bitmapSource;
if (currentFileExt == ".tif")
{
if (currentTiffDecoder == null)
{
currentState = ImagePreviewState.Unvalid;
break;
}
bitmapSource = currentTiffDecoder.Frames[currentTiffIndex];
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmapSource));
using (MemoryStream ms = new MemoryStream())
{
encoder.Save(ms);
BitmapImage myBitmapImage = new BitmapImage();
myBitmapImage.BeginInit();
myBitmapImage.StreamSource = new MemoryStream(ms.ToArray());
myBitmapImage.DecodePixelWidth = 400;
myBitmapImage.EndInit();
bitmapSource = myBitmapImage;
}
}
else
{
BitmapImage myBitmapImage = new BitmapImage();
myBitmapImage.BeginInit();
myBitmapImage.UriSource = new Uri(imagePaths[currentListIndex], UriKind.RelativeOrAbsolute);
myBitmapImage.DecodePixelWidth = 400;
myBitmapImage.EndInit();
bitmapSource = myBitmapImage;
}
//if (bitmapSource.PixelWidth < this.ActualWidth - 60 && bitmapSource.PixelHeight < this.ActualHeight - 60)
//{
// ImageView.Stretch = Stretch.None;
// //IsFitted = true;
//}
//else
//{
ImageView.Stretch = Stretch.Uniform;
//IsFitted = false;
//}
FormatConvertedBitmap fcb = new FormatConvertedBitmap(bitmapSource, PixelFormats.Gray8, null, 0);
ImageView.Source = fcb;
currentState = ImagePreviewState.Finalize;
}
else
{
currentState = ImagePreviewState.Unvalid;
}
break;
case ImagePreviewState.Finalize:
break;
case ImagePreviewState.Unvalid:
ImageView.Visibility = System.Windows.Visibility.Hidden;
ImageUnvalid.Visibility = System.Windows.Visibility.Visible;
currentState = ImagePreviewState.Finalize;
break;
case ImagePreviewState.Pre:
if (currentListIndex > 0)
{
currentListIndex--;
}
currentState = ImagePreviewState.Ready;
break;
case ImagePreviewState.Next:
if (currentListIndex < listCount - 1)
{
currentListIndex++;
}
currentState = ImagePreviewState.Ready;
break;
case ImagePreviewState.TiffState:
while (currentState != ImagePreviewState.Render)
{
switch (currentTiffState)
{
case ImagePreviewTiffState.TiffReady:
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
if (File.Exists(imagePaths[currentListIndex]))
{
Uri myUri = new Uri(imagePaths[currentListIndex], UriKind.RelativeOrAbsolute);
try
{
currentTiffDecoder = new TiffBitmapDecoder(myUri, BitmapCreateOptions.None, BitmapCacheOption.None);
}
catch (Exception)
{
currentTiffDecoder = null;
currentState = ImagePreviewState.Render;
break;
}
TiffCount = currentTiffDecoder.Frames.Count();
if (TiffCount == 1)
{
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
}
else
{
if (currentTiffIndex == 0)
{
PreTiffButton.Visibility = System.Windows.Visibility.Hidden;
NextTiffButton.Visibility = System.Windows.Visibility.Visible;
}
else if (currentTiffIndex == TiffCount - 1)
{
PreTiffButton.Visibility = System.Windows.Visibility.Visible;
NextTiffButton.Visibility = System.Windows.Visibility.Hidden;
}
else
{
PreTiffButton.Visibility = System.Windows.Visibility.Visible;
NextTiffButton.Visibility = System.Windows.Visibility.Visible;
}
}
}
currentState = ImagePreviewState.Render;
break;
case ImagePreviewTiffState.TiffPre:
if (currentTiffIndex > 0)
{
currentTiffIndex--;
}
currentTiffState = ImagePreviewTiffState.TiffReady;
break;
case ImagePreviewTiffState.TiffNext:
if (currentTiffIndex < TiffCount - 1)
{
currentTiffIndex++;
}
currentTiffState = ImagePreviewTiffState.TiffReady;
break;
}
}
break;
}
}
}
