Reason behind the change.
Object.defineProperty(ImageViewerItemChangedEventArgs.prototype, 'reason',
get: function()
)
reason: ImageViewerItemChangedReason; // read-only
The reason behind the change.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewer_ItemChangedExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
viewer.itemBorderThickness = 5;
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
const itemChangeReasons: string[] = ["size", "transform", "enabled", "selected", "hovered",
"text", "url", "drop", "drag", "image", "imageChanged", "floater",
"floaterTransform", "backImageUrl", "backImage"];
// Clear the items and add new items
viewer.beginUpdate();
viewer.items.clear();
for (let i = 0; i < 2; 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();
const output = document.getElementById("output");
viewer.itemChanged.add((sender, e) => {
let item = e.item;
const lines: string[] = [
"Item Changed: " + viewer.items.indexOf(item),
"Reason: " + itemChangeReasons[e.reason],
"Item Text: " + item.text,
"Url: " + item.url,
];
output.innerHTML = lines.map((line) => { return "<p>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML;
});
viewer.itemError.add((sender, e) => {
const item: lt.Controls.ImageViewerItem = e.item;
const lines: string[] = [
"Item Errored: " + viewer.items.indexOf(item),
"Reason: " + itemChangeReasons[e.reason],
"Url: " + item.url,
];
output.innerHTML = lines.map((line) => { return "<p style='color: red;'>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML;
});
// After a second, change
setTimeout(() => {
// Set a new valid URL and change the text (two different changes)
const item0: lt.Controls.ImageViewerItem = viewer.items.item(0);
item0.url = "https://demo.leadtools.com/images/png/pngimage.png";
item0.text = "Item 0 Text Changed";
// Set an invalid URL
const item1: lt.Controls.ImageViewerItem = viewer.items.item(1);
item1.url = "https://demo.leadtools.com/thisisnotavalidimage.png";
}, 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_ItemChangedExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
viewer.itemBorderThickness = 5;
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
const itemChangeReasons = ["size", "transform", "enabled", "selected", "hovered",
"text", "url", "drop", "drag", "image", "imageChanged", "floater",
"floaterTransform", "backImageUrl", "backImage"];
// Clear the items and add new items
viewer.beginUpdate();
viewer.items.clear();
for (let i = 0; i < 2; 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();
const output = document.getElementById("output");
viewer.itemChanged.add((sender, e) => {
let item = e.item;
const lines = [
"Item Changed: " + viewer.items.indexOf(item),
"Reason: " + itemChangeReasons[e.reason],
"Item Text: " + item.text,
"Url: " + item.url,
];
output.innerHTML = lines.map((line) => { return "<p>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML;
});
viewer.itemError.add((sender, e) => {
const item = e.item;
const lines = [
"Item Errored: " + viewer.items.indexOf(item),
"Reason: " + itemChangeReasons[e.reason],
"Url: " + item.url,
];
output.innerHTML = lines.map((line) => { return "<p style='color: red;'>" + line + "</p>" }).join("") + "<hr />" + output.innerHTML;
});
// After a second, change
setTimeout(() => {
// Set a new valid URL and change the text (two different changes)
const item0 = viewer.items.item(0);
item0.url = "https://demo.leadtools.com/images/png/pngimage.png";
item0.text = "Item 0 Text Changed";
// Set an invalid URL
const item1 = viewer.items.item(1);
item1.url = "https://demo.leadtools.com/thisisnotavalidimage.png";
}, 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 | ItemChanged</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.ItemChanged();
};
</script>
</html>
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document