isSelected Property

Summary

Indicates whether the item is in a selected state.

Syntax
TypeScript
JavaScript
Object.defineProperty(ImageViewerItem.prototype, 'isSelected', 
	get: function(), 
	set: function(value) 
) 
isSelected: boolean; 

Property Value

true if this item is in a selected state, otherwise; false. Default value is false.

Remarks

Selected items (the value of IsSelected is true) may be rendered differently than non-selected items as described in Image Viewer Appearance.

Select and GetSelected can be used to select multiple items at once and get all the selected items in the viewer respectively.

ImageViewerSelectItemsInteractiveMode can be used to select items in the viewer using mouse, touch or keyboard in a manner similar to an "image list" application such as Windows Explorer in Thumbnail View.

For more information, refer Image Viewer Items.

Example
IsEnabled.ts
ImageViewer.ts
IsEnabled.js
ImageViewer.js
IsEnabled.html
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewerItem_IsEnabledExample { 
   private viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   private run = (viewer: lt.Controls.ImageViewer) => { 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
 
      // Change the layout to multi-item 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
      viewer.itemBorderThickness = 5; 
      viewer.itemPadding = lt.Controls.ControlPadding.createAll(20); 
      viewer.itemSpacing = lt.LeadSizeD.create(10, 10); 
      // Selected items will have a green border 
      viewer.selectedItemBorderColor = "lightgreen"; 
      viewer.hoveredItemBorderColor = "orange"; 
 
      // Add a few more items 
      for (let i = 0; i < 4; i++) { 
         const item: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem(); 
         item.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
         item.text = "Item " + i; 
         viewer.items.add(item); 
      } 
 
      // Zoom out so we can see more of the items 
      viewer.zoom(lt.Controls.ControlSizeMode.none, .5, viewer.defaultZoomOrigin); 
 
      // Clear the interactive modes and add one selection mode with rubberband multi-selection support 
      viewer.interactiveModes.clear(); 
      const selectItemsMode: lt.Controls.ImageViewerSelectItemsInteractiveMode = new lt.Controls.ImageViewerSelectItemsInteractiveMode(); 
      selectItemsMode.selectionMode = lt.Controls.ImageViewerSelectionMode.multi; 
      viewer.interactiveModes.add(selectItemsMode); 
 
      viewer.endUpdate(); 
 
      // Make the second (index 1) item disabled so it cannot be selected. 
      const item: lt.Controls.ImageViewerItem = viewer.items.item(1); 
      item.isEnabled = false; 
      const output = document.getElementById("output"); 
      output.innerHTML = "Item 1 is disabled."; 
   } 
} 
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 ImageViewerItem_IsEnabledExample { 
   viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   run = (viewer) => { 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
 
      // Change the layout to multi-item 
      viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout(); 
      viewer.itemBorderThickness = 5; 
      viewer.itemPadding = lt.Controls.ControlPadding.createAll(20); 
      viewer.itemSpacing = lt.LeadSizeD.create(10, 10); 
      // Selected items will have a green border 
      viewer.selectedItemBorderColor = "lightgreen"; 
      viewer.hoveredItemBorderColor = "orange"; 
 
      // Add a few more items 
      for (let i = 0; i < 4; i++) { 
         const item = new lt.Controls.ImageViewerItem(); 
         item.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
         item.text = "Item " + i; 
         viewer.items.add(item); 
      } 
 
      // Zoom out so we can see more of the items 
      viewer.zoom(lt.Controls.ControlSizeMode.none, .5, viewer.defaultZoomOrigin); 
 
      // Clear the interactive modes and add one selection mode with rubberband multi-selection support 
      viewer.interactiveModes.clear(); 
      const selectItemsMode = new lt.Controls.ImageViewerSelectItemsInteractiveMode(); 
      selectItemsMode.selectionMode = lt.Controls.ImageViewerSelectionMode.multi; 
      viewer.interactiveModes.add(selectItemsMode); 
 
      viewer.endUpdate(); 
 
      // Make the second (index 1) item disabled so it cannot be selected. 
      const item = viewer.items.item(1); 
      item.isEnabled = false; 
      const output = document.getElementById("output"); 
      output.innerHTML = "Item 1 is disabled."; 
   } 
} 
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 | IsEnabled</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.ImageViewerItem.IsEnabled(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 22.0.2023.2.4
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Controls Assembly

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