The target item for this drop operation.
Object.defineProperty(ImageViewerItemDragDropEventArgs.prototype, 'targetItem',
get: function(),
set: function(value)
)
targetItem: ImageViewerItem;
The item in TargetImageViewer that will currently be the target for the drop operation. Or null if the drag item is not over any item.
This is the item in TargetImageViewer that will currently be the target for the drop operation. It can be null if the image viewer does not have any items or if the object is not on top of any item boundary.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewer_ItemDragDropExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
// Set margins, padding, and borders
viewer.viewMargin = lt.Controls.ControlPadding.createAll(15);
viewer.itemPadding = lt.Controls.ControlPadding.createAll(20);
viewer.itemBorderThickness = 5;
viewer.itemMargin = lt.Controls.ControlPadding.createAll(10);
// Clear the items and add new ones
viewer.beginUpdate();
viewer.items.clear();
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
let item0: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem();
item0.text = "Item 0";
item0.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg";
viewer.items.add(item0);
let item1: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem();
item1.text = "Item 1";
item1.url = "https://demo.leadtools.com/images/png/pngimage.png";
viewer.items.add(item1);
viewer.endUpdate();
viewer.allowDrop = true;
viewer.activeItem = viewer.items.item(0);
viewer.interactiveModes.beginUpdate();
const dragMode = new lt.Controls.ImageViewerDragInteractiveMode();
viewer.interactiveModes.insert(0, dragMode);
viewer.interactiveModes.endUpdate();
const getOpName = (value) => {
const enumOb = lt.Controls.ImageViewerItemDragDropOperation;
for (const prop in enumOb) {
if (enumOb.hasOwnProperty(prop)) {
if (enumOb[prop] === value)
return prop;
}
}
return null;
}
let previousOp: lt.Controls.ImageViewerItemDragDropOperation = null;
// Drag items to use
viewer.itemDragDrop.add((sender, e) => {
if (previousOp === e.operation)
return;
previousOp = e.operation;
const sourceItem: lt.Controls.ImageViewerItem = e.sourceItem;
const sourceImageViewer: lt.Controls.ImageViewer = e.sourceImageViewer;
const targetItem: lt.Controls.ImageViewerItem = e.targetItem;
const targetImageViewer: lt.Controls.ImageViewer = e.targetImageViewer;
// Log all the information to the console
console.log({
operation: getOpName(e.operation),
sourceItem: sourceItem && sourceImageViewer.items.indexOf(sourceItem),
sourceImageViewer: sourceImageViewer,
targetItem: targetItem && targetImageViewer && targetImageViewer.items.indexOf(targetItem),
targetImageViewer: targetImageViewer
});
});
}
}
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_ItemDragDropExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
// Set margins, padding, and borders
viewer.viewMargin = lt.Controls.ControlPadding.createAll(15);
viewer.itemPadding = lt.Controls.ControlPadding.createAll(20);
viewer.itemBorderThickness = 5;
viewer.itemMargin = lt.Controls.ControlPadding.createAll(10);
// Clear the items and add new ones
viewer.beginUpdate();
viewer.items.clear();
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
let item0 = new lt.Controls.ImageViewerItem();
item0.text = "Item 0";
item0.url = "https://demo.leadtools.com/images/jpeg/cannon.jpg";
viewer.items.add(item0);
let item1 = new lt.Controls.ImageViewerItem();
item1.text = "Item 1";
item1.url = "https://demo.leadtools.com/images/png/pngimage.png";
viewer.items.add(item1);
viewer.endUpdate();
viewer.allowDrop = true;
viewer.activeItem = viewer.items.item(0);
viewer.interactiveModes.beginUpdate();
const dragMode = new lt.Controls.ImageViewerDragInteractiveMode();
viewer.interactiveModes.insert(0, dragMode);
viewer.interactiveModes.endUpdate();
const getOpName = (value) => {
const enumOb = lt.Controls.ImageViewerItemDragDropOperation;
for (const prop in enumOb) {
if (enumOb.hasOwnProperty(prop)) {
if (enumOb[prop] === value)
return prop;
}
}
return null;
}
let previousOp = null;
// Drag items to use
viewer.itemDragDrop.add((sender, e) => {
if (previousOp === e.operation)
return;
previousOp = e.operation;
const sourceItem = e.sourceItem;
const sourceImageViewer = e.sourceImageViewer;
const targetItem = e.targetItem;
const targetImageViewer = e.targetImageViewer;
// Log all the information to the console
console.log({
operation: getOpName(e.operation),
sourceItem: sourceItem && sourceImageViewer.items.indexOf(sourceItem),
sourceImageViewer: sourceImageViewer,
targetItem: targetItem && targetImageViewer && targetImageViewer.items.indexOf(targetItem),
targetImageViewer: targetImageViewer
});
});
}
}
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 | ItemDragonDrop</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.ItemDragDrop();
};
</script>
</html>
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