ImageViewerItem Object

Summary

Represents an ImageViewer item, each containing its own image data, size, and optional additional transformations.

Syntax
TypeScript
JavaScript
function lt.Controls.ImageViewerItem 
class lt.Controls.ImageViewerItem() 
Remarks

ImageViewer supports one or more items, with each item containing its own image data, size, and optional additional transformations.

ImageViewerItem supports raster image or SVG data.

For more information, refer to Image Viewer Items.

Example
Items.ts
ImageViewer.ts
Items.js
ImageViewer.js
Items.html
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewer_ItemsExample { 
   private viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   private run = (viewer: lt.Controls.ImageViewer) => { 
      // Clear all the images already the viewer 
      viewer.items.clear(); 
 
      // Use vertical view layout to show multiple items 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
      viewer.imageBorderThickness = 1; 
 
      // Add 4 items to the viewer 
      for (let page = 1; page <= 4; page++) { 
         const item: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem(); 
         const imageUrl: string = "https://demo.leadtools.com/images/png/ocr" + page.toString() + ".png"; 
         item.text = "Page " + page; 
         item.url = imageUrl; 
         viewer.items.add(item); 
      } 
 
      let panZoom: lt.Controls.ImageViewerPanZoomInteractiveMode = viewer.interactiveModes.findById(lt.Controls.ImageViewerInteractiveMode.panZoomModeId) as lt.Controls.ImageViewerPanZoomInteractiveMode; 
      panZoom.minimumScaleFactor = 0.01; 
      viewer.zoom(lt.Controls.ControlSizeMode.fitHeight, .25, viewer.defaultZoomOrigin); 
 
      // Show the count 
      alert("The count should be 4: " + viewer.items.count); 
 
      // Not required, just used for the example 
      setTimeout(() => { 
 
         // Remove the item at index 1 (page 2) 
         viewer.items.removeAt(1); 
         alert("After removing an item, the count should be 3: " + viewer.items.count); 
 
         // Not required, just used for the example 
         setTimeout(() => { 
 
            // Loop through each item and show the text. Since we removed page 2, it must say 1, 3, 4 
            let lines: string[] = []; 
            for (let i = 0; i < viewer.items.count; i++) { 
               const item: lt.Controls.ImageViewerItem = viewer.items.item(i); 
               lines.push("Item " + i + " has text '" + item.text + "'"); 
            } 
            alert(lines.join("\r\n")); 
 
         }, 1000); 
      }, 1000); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   protected imageViewer: lt.Controls.ImageViewer = null; 
   // Generic state value used by the examples 
   public timesClicked: number = 0; 
 
   constructor(callback?: (viewer: lt.Controls.ImageViewer) => void) { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
 
      // Create an image viewer inside the imageViewerDiv element 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions: lt.Controls.ImageViewerCreateOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
      this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.autoCreateCanvas = true; 
 
      // Add Pan/Zoom interactive mode 
      // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
 
      // Load an image 
      this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
 
      this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.addEventListener("click", () => { 
         this.timesClicked++; 
         // Run the example 
         if (callback) 
            callback(this.imageViewer); 
      }); 
   } 
} 
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewer_ItemsExample { 
   viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   run = (viewer) => { 
      // Clear all the images already the viewer 
      viewer.items.clear(); 
 
      // Use vertical view layout to show multiple items 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
      viewer.imageBorderThickness = 1; 
 
      // Add 4 items to the viewer 
      for (let page = 1; page <= 4; page++) { 
         const item = new lt.Controls.ImageViewerItem(); 
         const imageUrl = "https://demo.leadtools.com/images/png/ocr" + page.toString() + ".png"; 
         item.text = "Page " + page; 
         item.url = imageUrl; 
         viewer.items.add(item); 
      } 
 
      let panZoom = viewer.interactiveModes.findById(lt.Controls.ImageViewerInteractiveMode.panZoomModeId); 
      panZoom.minimumScaleFactor = 0.01; 
      viewer.zoom(lt.Controls.ControlSizeMode.fitHeight, .25, viewer.defaultZoomOrigin); 
 
      // Show the count 
      alert("The count should be 4: " + viewer.items.count); 
 
      // Not required, just used for the example 
      setTimeout(() => { 
 
         // Remove the item at index 1 (page 2) 
         viewer.items.removeAt(1); 
         alert("After removing an item, the count should be 3: " + viewer.items.count); 
 
         // Not required, just used for the example 
         setTimeout(() => { 
 
            // Loop through each item and show the text. Since we removed page 2, it must say 1, 3, 4 
            let lines = []; 
            for (let i = 0; i < viewer.items.count; i++) { 
               const item = viewer.items.item(i); 
               lines.push("Item " + i + " has text '" + item.text + "'"); 
            } 
            alert(lines.join("\r\n")); 
 
         }, 1000); 
      }, 1000); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   imageViewer = null; 
   // Generic state value used by the examples 
   timesClicked = 0; 
 
   constructor(callback) { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
 
      // Create an image viewer inside the imageViewerDiv element 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
      this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
      this.imageViewer.autoCreateCanvas = true; 
 
      // Add Pan/Zoom interactive mode 
      // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
 
      // Load an image 
      this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
 
      this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.addEventListener("click", () => { 
         this.timesClicked++; 
         // Run the example 
         if (callback) 
            callback(this.imageViewer); 
      }); 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>Controls Example | Items</title> 
 
<head> 
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" 
      integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> 
 
   <script src="../../LT/Leadtools.js"></script> 
   <script src="../../LT/Leadtools.Controls.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Engine.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Designers.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Rendering.Javascript.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Automation.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Main.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Color.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Core.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Effects.js"></script> 
   <script src="../../LT/Leadtools.Document.js"></script> 
   <script src="../../LT/Leadtools.Document.Viewer.js"></script> 
   <style> 
      body { 
         font-family: 'Segoe UI', sans-serif; 
      } 
 
      #imageViewerDiv { 
         border: 1px solid #888; 
         width: 500px; 
         height: 500px; 
         background-color: #eee; 
      } 
   </style> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <p>Press and drag on the image to pan.</p> 
   <p>Hold down the control key and press and drag on the image or pinch with two fingers to zoom in and out.</p> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="imageViewerDiv"></div> 
   <div id="output"></div> 
</body> 
 
<script> 
   window.onload = () => { 
      const example = new window.examples.ImageViewer.Items(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Controls Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.