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ImageViewer Class

Summary

Represents a scrollable control that displays one or more raster or SVG images with optional interactive UI operations.

Syntax

C#
VB
C++
public class ImageViewer : ScrollableControl, INotifyPropertyChanged 

Public Class ImageViewer 
   Inherits System.Windows.Forms.ScrollableControl 

public ref class ImageViewer : System::Windows::Forms::ScrollableControl 

Remarks

The LEADTOOLS ImageViewer class represents a control that displays one or more images with optional interactive UI operations. It supports single item applications such as MS-Paint or multiple item applications such as Adobe Acrobat.

Image Viewer
  1. LEADTOOLS Main Demo uses an Image Viewer instance in single layout mode to view the main image

  2. LEADTOOLS Document Viewer uses an Image Viewer instance in vertical layout to view thumbnails of pages

  3. And another Image Viewer instance with in double layout to view the main content

ImageViewer supports the following features

  • Single or multiple items each with its own image data, size and optional additional transformation

  • Built in support for raster and SVG images and documents including loading directly from disk file or URLs

  • Extensible layout system with built-in support for single, vertical and horizontal layouts

  • Rich built-in and fully customizable and extensible user-interface interaction support for panning, zooming, magnify glass, rubber banding and many more. Support for both mouse and touch input

  • Fully customizable appearance and position

  • Auto and custom scroll modes

  • Owner draw rendering

  • Viewing options including infinite zooming with size modes (fit, fit page, etc.), rotation at any angle, flip, reverse, color inversion and low level transformation

  • High level items operations for hit-testing and automatically go to a certain item or page

  • Drag and drop between the image viewer and external sources such as the file system or other image viewers instances

  • Floater and region support

  • Virtualization mode for handling large number of images

Refer to the following topics for more in-depth information on each group of functionalities:

Example

This example will create an ImageViewer, set the interactive mode to Pan/Zoom and adds an image to it.

C#
VB
using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using LeadtoolsExamples.Common; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void ImageViewer_Example() 
{ 
   // Create the form that holds the ImageViewer 
   new MyForm().ShowDialog(); 
} 
 
class MyForm : Form 
{ 
   public MyForm() 
   { 
      this.Size = new Size(800, 800); 
   } 
 
   // LEADTOOLS ImageViewer to be used with this example 
   private ImageViewer _imageViewer; 
   // Information label 
   private Label _label; 
   // Generic state value used by the examples 
   private bool _firstCall = true; 
 
   protected override void OnLoad(EventArgs e) 
   { 
      // Create a panel to the top 
      var panel = new Panel(); 
      panel.Dock = DockStyle.Top; 
      panel.BorderStyle = BorderStyle.FixedSingle; 
      this.Controls.Add(panel); 
 
      // Add an "Example" button to the panel 
      var button = new Button(); 
      button.Text = "&Example"; 
      button.Click += (sender, e1) => Example(); 
      panel.Controls.Add(button); 
 
      // Add a label to the panel 
      _label = new Label(); 
      _label.Top = button.Bottom; 
      _label.Width = 800; 
      _label.Text = "Example..."; 
      panel.Controls.Add(_label); 
 
      // Create the image viewer taking the rest of the form 
      _imageViewer = new ImageViewer(); 
      _imageViewer.Dock = DockStyle.Fill; 
      _imageViewer.BackColor = Color.Bisque; 
      this.Controls.Add(_imageViewer); 
      _imageViewer.BringToFront(); 
 
      // Add Pan/Zoom interactive mode 
      // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      _imageViewer.DefaultInteractiveMode = new ImageViewerPanZoomInteractiveMode(); 
 
      // Load an image 
      using (var codecs = new RasterCodecs()) 
         _imageViewer.Image = codecs.Load(Path.Combine(ImagesPath.Path, "image1.cmp")); 
 
      _firstCall = true; 
 
      base.OnLoad(e); 
   } 
 
   private void Example() 
   { 
      // Example code goes here 
   } 
} 

Imports Leadtools 
Imports Leadtools.Controls 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports LeadtoolsControlsExamples.LeadtoolsExamples.Common 
 
Public Sub ImageViewer_Example() 
   ' Create the form that holds the ImageViewer 
   CType(New MyForm(), MyForm).ShowDialog() 
End Sub 
 
Private Class MyForm : Inherits Form 
   Public Sub New() 
      Me.Size = New Size(800, 800) 
   End Sub 
 
   ' LEADTOOLS ImageViewer to be used with this example 
   Private _imageViewer As ImageViewer 
   ' Information label 
   Private _label As Label 
   ' Generic state value used by the examples 
   Private _firstCall As Boolean = True 
 
   Protected Overrides Sub OnLoad(ByVal e As EventArgs) 
      ' Create a panel to the top 
      Dim panel As New Panel() 
      panel.Dock = DockStyle.Top 
      panel.BorderStyle = BorderStyle.FixedSingle 
      Me.Controls.Add(panel) 
 
      ' Add an "Example" button to the panel 
      Dim button As New Button() 
      button.Text = "&Example" 
      AddHandler button.Click, Sub(sender, e1) Example() 
      panel.Controls.Add(button) 
 
      ' Add a label to the panel 
      _label = New Label() 
      _label.Top = button.Bottom 
      _label.Width = 800 
      _label.Text = "Example..." 
      panel.Controls.Add(_label) 
 
      ' Create the image viewer taking the rest of the form 
      _imageViewer = New ImageViewer() 
      _imageViewer.Dock = DockStyle.Fill 
      _imageViewer.BackColor = Color.Bisque 
      Me.Controls.Add(_imageViewer) 
      _imageViewer.BringToFront() 
 
      ' Add Pan/Zoom interactive mode 
      ' Click and drag to pan, CTRL-Click and drag to zoom in and out 
      _imageViewer.DefaultInteractiveMode = New ImageViewerPanZoomInteractiveMode() 
 
      ' Load an image 
      Using codecs As New RasterCodecs() 
         _imageViewer.Image = codecs.Load(Path.Combine(ImagesPath.Path, "image1.cmp")) 
      End Using 
 
      _firstCall = True 
 
      MyBase.OnLoad(e) 
   End Sub 
 
   Private Sub Example() 
      ' Example code goes here 
   End Sub 
End Class 

Requirements

Target Platforms

Help Version 20.0.2018.6.20
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Leadtools.Controls Assembly