Returns the current selected items in the viewer
ImageViewerItems.prototype.getSelected = function()
getSelected(): ImageViewerItem[];
An array of the items that are currently selected in the viewer.
This method will return an array that contains all the items that have the value of ImageViewerItem.IsSelected set to true.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewer_SelectedItemsChangedExample {
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
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
// Make sure the item size is larger than the image size (thumbnails mode)
viewer.imageBorderThickness = 1;
// Change the selected item background color
viewer.selectedItemBackgroundColor = "lightblue";
// 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.url = imageUrl;
viewer.items.add(item);
}
// Add the interface mode to select items (multiple)
const selectItemsMode: lt.Controls.ImageViewerSelectItemsInteractiveMode = new lt.Controls.ImageViewerSelectItemsInteractiveMode();
selectItemsMode.selectionMode = lt.Controls.ImageViewerSelectionMode.multi;
viewer.interactiveModes.clear();
viewer.interactiveModes.add(selectItemsMode);
const output = document.getElementById("output");
// Hook to the SelectItemsChanged event and update the text
viewer.selectedItemsChanged.add((sender, e) => {
// Get the selected items
let items: lt.Controls.ImageViewerItem[] = viewer.items.getSelected();
let indices: number[] = [];
for (let i = 0; i < items.length; i++) {
const item: lt.Controls.ImageViewerItem = items[i];
indices.push(viewer.items.indexOf(item));
}
output.innerHTML = "Selected indices: " + indices.join(", ");
});
}
}
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_SelectedItemsChangedExample {
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
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
// Make sure the item size is larger than the image size (thumbnails mode)
viewer.imageBorderThickness = 1;
// Change the selected item background color
viewer.selectedItemBackgroundColor = "lightblue";
// 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.url = imageUrl;
viewer.items.add(item);
}
// Add the interface mode to select items (multiple)
const selectItemsMode = new lt.Controls.ImageViewerSelectItemsInteractiveMode();
selectItemsMode.selectionMode = lt.Controls.ImageViewerSelectionMode.multi;
viewer.interactiveModes.clear();
viewer.interactiveModes.add(selectItemsMode);
const output = document.getElementById("output");
// Hook to the SelectItemsChanged event and update the text
viewer.selectedItemsChanged.add((sender, e) => {
// Get the selected items
let items = viewer.items.getSelected();
let indices = [];
for (let i = 0; i < items.length; i++) {
const item = items[i];
indices.push(viewer.items.indexOf(item));
}
output.innerHTML = "Selected indices: " + indices.join(", ");
});
}
}
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 | SelectedItemsChanged</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.SelectedItemsChanged();
};
</script>
</html>
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