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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#
Objective-C
C++
public class ImageViewer : ScrollableControl, INotifyPropertyChanged 
@interface LTImageViewer : NSView<NSCoding> 
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 the pages.

  3. Another Image Viewer instance is used 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 transformations.

  • 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, magnifying 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 going to a certain item or page.

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

  • Floater and region support.

  • Virtualization mode for handling large number of images.

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

Example

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

C#
using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
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; 
 
   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(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
      base.OnLoad(e); 
   } 
 
   private void Example() 
   { 
      // Example code goes here 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2022.6.17
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Leadtools.Controls Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.