Help Event

Summary
Occurs when the user clicks the help button.
Syntax
C#
C++/CLI
public event EventHandler<RasterColorDialogHelpEventArgs> Help 
public: 
event EventHandler<RasterColorDialogHelpEventArgs^>^ Help 
Event Data

The event handler receives an argument of type RasterColorDialogHelpEventArgs containing data related to this event. The following RasterColorDialogHelpEventArgs properties provide information specific to this event.

PropertyDescription
Dialog Gets the dialog help ID RasterColorDialogHelpName that triggered the help event.
Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.WinForms.CommonDialogs.Color; 
 
 
public void windowLevelDlg_Help(object sender, RasterColorDialogHelpEventArgs e) 
{ 
   if (e.Dialog == RasterColorDialogHelpName.WindowLevel) 
   { 
      MessageBox.Show("Window Level dialog Help"); 
   } 
} 
 
 
public void WindowLevelDialogExample() 
{       
   // initialize the RasterCodecs 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // load an image 
   RasterImage rasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Beauty16.jpg")); 
 
   int size; 
   RasterWindowLevelDialog windowLevelDlg = new RasterWindowLevelDialog(); 
   MinMaxBitsCommand minMaxBitsCmd = new MinMaxBitsCommand(); 
   MinMaxValuesCommand minMaxValuesCmd = new MinMaxValuesCommand(); 
 
   size = (1 << (rasterImage.HighBit - rasterImage.LowBit + 1)); 
 
   minMaxBitsCmd.Run(rasterImage); 
   windowLevelDlg.LowBit = minMaxBitsCmd.MinimumBit; 
   windowLevelDlg.HighBit = minMaxBitsCmd.MaximumBit; 
 
   minMaxValuesCmd.Run(rasterImage); 
   windowLevelDlg.Low = minMaxValuesCmd.MinimumValue; 
   windowLevelDlg.High = minMaxValuesCmd.MaximumValue; 
 
   windowLevelDlg.AutoProcess = false; 
   windowLevelDlg.Factor = 0; 
   windowLevelDlg.Image = rasterImage; 
   windowLevelDlg.ZoomToFit = true; 
   windowLevelDlg.ShowPreview = true; 
   windowLevelDlg.ShowZoomLevel = true; 
   windowLevelDlg.ShowHelp = false; 
   windowLevelDlg.ShowRange = true; 
   windowLevelDlg.Signed = rasterImage.Signed; 
   windowLevelDlg.LookupTable = new Leadtools.RasterColor[size]; 
   windowLevelDlg.StartColor = new Leadtools.RasterColor(0, 0, 0); 
   windowLevelDlg.EndColor = new Leadtools.RasterColor(255, 255, 255); 
   windowLevelDlg.WindowLevelFlags = Leadtools.RasterPaletteWindowLevelFlags.Inside | Leadtools.RasterPaletteWindowLevelFlags.Linear; 
   windowLevelDlg.Help += new EventHandler<RasterColorDialogHelpEventArgs>(windowLevelDlg_Help); 
 
 
   if (DialogResult.OK == windowLevelDlg.ShowDialog(null)) 
   { 
      WindowLevelCommand command = new WindowLevelCommand(); 
 
      command.HighBit = windowLevelDlg.HighBit; 
      command.LowBit = windowLevelDlg.LowBit; 
      command.LookupTable = windowLevelDlg.LookupTable; 
      command.Order = Leadtools.RasterByteOrder.Bgr; 
 
      command.Run(rasterImage); 
   } 
 
   // save the resulted image 
   codecs.Save(rasterImage, Path.Combine(LEAD_VARS.ImagesDir, "WindowLevelDialogResult.bmp"), RasterImageFormat.Bmp, 24); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2023.1.24
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.