ImageViewerVerticalViewLayout Object

Summary

Defines the vertical view layout.

Syntax
TypeScript
JavaScript
function lt.Controls.ImageViewerVerticalViewLayout 
	extends lt.Controls.ImageViewerViewLayout 
class lt.Controls.ImageViewerVerticalViewLayout() 
	extends ImageViewerViewLayout 
Remarks

The items are stacked on top of each other. More than one item can be visible at any time and is controlled by the current item position and size as well the view scroll position. ActiveItem does not affect which item is being viewed.

Here is the LEADTOOLS Document View in a vertical page mode:

DocumentViewerVertical

Notice how more than one page is visible at the same time. The view scrollbar reflect the total size of the document, not any page individually.

The vertical view layout contains the Columns property then controls how many items are displayed horizontally before moving to the next row. In the previous screenshot, the document viewer is using a vertical layout with Columns set to 1. Hence, a single page is displayed in each row. Here's the document viewer using a vertical view layout with Columns set to 2:

DocumentViewerDouble

Here, the viewer will add a maximum of two items in each row before moving to the next. The scrollbar size reflect that. Setting the value of Columns to 0 will instruct the viewer to the row with as many items (minimum of 1) before moving to the next. This value is not fixed and is dynamically calculated from the view size. Resizing the viewer will trigger a recalculation. This mode is similar to Windows Explorer in Thumbnails mode.

For more information, refer to Image Viewer Layouts, Image Viewer Items, Image Viewer Transformation and Image Viewer Bounds and Transform.

Example
ViewLayout.ts
ImageViewer.ts
ViewLayout.js
ImageViewer.js
ViewLayout.html
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class ImageViewer_ViewLayoutExample { 
   private viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   private run = (viewer: lt.Controls.ImageViewer) => { 
      let flip: boolean = false; 
      const setLayout = () => { 
         flip = !flip; 
         let layout: lt.Controls.ImageViewerViewLayout; 
         if (flip) { 
            layout = new lt.Controls.ImageViewerVerticalViewLayout(); 
            (layout as lt.Controls.ImageViewerVerticalViewLayout).columns = 2; 
         } 
         else { 
            layout = new lt.Controls.ImageViewerHorizontalViewLayout(); 
            (layout as lt.Controls.ImageViewerHorizontalViewLayout).rows = 2; 
         } 
         viewer.viewLayout = layout; 
      } 
 
      // Set the initial layout 
      setLayout(); 
 
      // Add borders and padding 
      viewer.viewBorderThickness = 2; 
      viewer.itemPadding = lt.Controls.ControlPadding.createAll(20); 
 
      // Clear the items and add 6 new items 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
      for (let i = 0; i < 6; 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); 
      } 
      viewer.endUpdate(); 
 
      // Zoom out so we can see all the items 
      viewer.zoom(lt.Controls.ControlSizeMode.fit, .5, viewer.defaultZoomOrigin); 
 
      // Add a button to update the layout 
      const button = document.createElement("button"); 
      button.innerHTML = "Change Layout"; 
      button.onclick = () => { 
         setLayout(); 
      }; 
      const output = document.getElementById("output"); 
      output.appendChild(button); 
   } 
} 
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_ViewLayoutExample { 
   viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   run = (viewer) => { 
      let flip = false; 
      const setLayout = () => { 
         flip = !flip; 
         let layout; 
         if (flip) { 
            layout = new lt.Controls.ImageViewerVerticalViewLayout(); 
            (layout).columns = 2; 
         } 
         else { 
            layout = new lt.Controls.ImageViewerHorizontalViewLayout(); 
            (layout).rows = 2; 
         } 
         viewer.viewLayout = layout; 
      } 
 
      // Set the initial layout 
      setLayout(); 
 
      // Add borders and padding 
      viewer.viewBorderThickness = 2; 
      viewer.itemPadding = lt.Controls.ControlPadding.createAll(20); 
 
      // Clear the items and add 6 new items 
      viewer.beginUpdate(); 
      viewer.items.clear(); 
      for (let i = 0; i < 6; 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); 
      } 
      viewer.endUpdate(); 
 
      // Zoom out so we can see all the items 
      viewer.zoom(lt.Controls.ControlSizeMode.fit, .5, viewer.defaultZoomOrigin); 
 
      // Add a button to update the layout 
      const button = document.createElement("button"); 
      button.innerHTML = "Change Layout"; 
      button.onclick = () => { 
         setLayout(); 
      }; 
      const output = document.getElementById("output"); 
      output.appendChild(button); 
   } 
} 
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 | ViewLayout</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.ViewLayout(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 22.0.2023.2.4
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© 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.