Columns Property

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
public ImageViewerForm _form = new ImageViewerForm(); 
public ComboBox comboBox = new ComboBox(); 
public ImageViewer _imageViewer; 
 
public void ImageViewerViewLayoutExample() 
{ 
 
   // Get the ImageViewer control from the form 
   _imageViewer = _form.ImageViewer; 
 
   // Clear all the images already the viewer 
   _imageViewer.Items.Clear(); 
   // Use vertical view layout 
   _imageViewer.ViewLayout = new ImageViewerVerticalViewLayout(); 
   // Item Border 
   _imageViewer.ItemBorderThickness = 1; 
   // Make sure the item size is larger than the image size (thumbnails mode) 
   _imageViewer.ItemSize = LeadSize.Create(200, 200); 
 
   // Add 4 items to the viewer 
   using (var codecs = new RasterCodecs()) 
   { 
      for (var page = 1; page <= 4; page++) 
      { 
         ImageViewerItem item = new ImageViewerItem(); 
         var fileName = Path.Combine(LEAD_VARS.ImagesDir, string.Format("ocr{0}.tif", page)); 
 
         // Create a thumbnail from the image 
         using (var image = codecs.Load(fileName, page)) 
         { 
            item.Image = image.CreateThumbnail(180, 180, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Resample); 
         } 
         _imageViewer.Items.Add(item); 
      } 
   } 
 
   // Add a combo box control to show the view layout modes 
   comboBox.Top = _form.ClientRectangle.Top; 
   _form.Controls.Add(comboBox); 
 
   // Add an entry for each view mode to the combo box 
   comboBox.Items.Add("Single view layout"); 
   comboBox.Items.Add("Vertical view layout"); 
   comboBox.Items.Add("Horizontal view layout"); 
   comboBox.Items.Add("Vertical view layout - 2 Columns"); 
   comboBox.Items.Add("Horizontal view layout - 2 Rows"); 
 
   comboBox.BringToFront(); 
 
   // When the user selects a view layout mode from the combo box 
   comboBox.SelectedIndexChanged += ComboBox_SelectedIndexChanged; 
} 
 
private void ComboBox_SelectedIndexChanged(object sender, EventArgs e) 
{ 
   ComboBox comboBox = sender as ComboBox; 
   ImageViewerViewLayout layout; 
 
   switch (comboBox.SelectedItem.ToString()) 
   { 
      case "Single view layout": 
         layout = new ImageViewerSingleViewLayout(); 
         break; 
      case "Vertical view layout": 
      default: 
         layout = new ImageViewerVerticalViewLayout(); 
         break; 
      case "Horizontal view layout": 
         layout = new ImageViewerHorizontalViewLayout(); 
         break; 
      case "Vertical view layout - 2 Columns": 
         layout = new ImageViewerVerticalViewLayout() { Columns = 2 }; 
         break; 
      case "Horizontal view layout - 2 Rows": 
         layout = new ImageViewerHorizontalViewLayout() { Rows = 2 }; 
         break; 
   } 
 
   _imageViewer.ViewLayout = layout; 
   _imageViewer.UpdateTransform(); 
   // Call Zoom with current values to update ImageViewer.ViewLayout values 
   _imageViewer.Zoom(_imageViewer.SizeMode, _imageViewer.ScaleFactor, _imageViewer.DefaultZoomOrigin);  
 
   string msg = string.Format("Layout.Name = {0}\nLayout.SizeModeHeight = {1}\nLayout.SizeModeHeightItemCount = {2}\nLayout.SizeModeWidth = {3}\nLayout.SizeModeWidthItemCount = {4}\n", 
      _imageViewer.ViewLayout.Name, 
      _imageViewer.ViewLayout.SizeModeHeight, 
      _imageViewer.ViewLayout.SizeModeHeightItemCount, 
      _imageViewer.ViewLayout.SizeModeWidth, 
      _imageViewer.ViewLayout.SizeModeWidthItemCount); 
   Debug.WriteLine(msg, "ImageViewerLayout Information"); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}