Enables an interactive mode in the collection.
ImageViewerInteractiveModes.prototype.enable = function(
mode
)
enable(
mode: ImageViewerInteractiveMode
): void;
mode
The interactive mode to enable. null will disable all items in the collection.
This method will iterate through all the item collection and set IsEnabled to false on all items except mode, which will be set to true.
This example adds two interactive modes and a select element to choose between them. Whichever interactive mode is selected becomes enabled while the other mode is disabled. Notice that this is done without rearranging the interactive modes in their collection.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewerInteractiveMode_EnableExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
// Create a select box
const output = document.getElementById("output");
const select = document.createElement("select");
output.appendChild(select);
// Signal that interactive modes are being updated and should all be stopped.
viewer.interactiveModes.beginUpdate();
viewer.interactiveModes.clearItems();
// Add two new interactive modes
const panZoomMode: lt.Controls.ImageViewerPanZoomInteractiveMode = new lt.Controls.ImageViewerPanZoomInteractiveMode();
viewer.interactiveModes.add(panZoomMode);
const magnifyGlassMode: lt.Controls.ImageViewerMagnifyGlassInteractiveMode = new lt.Controls.ImageViewerMagnifyGlassInteractiveMode();
viewer.interactiveModes.add(magnifyGlassMode);
// Add options for each to be selected
for (let i = 0; i < viewer.interactiveModes.count; i++) {
const option = document.createElement("option");
option.innerHTML = viewer.interactiveModes.item(i).name;
select.appendChild(option);
}
select.addEventListener("change", () => {
this.updateEnabled(select.selectedIndex, viewer);
});
// Start with panZoom mode
select.selectedIndex = 0;
this.updateEnabled(select.selectedIndex, viewer);
// End updates
viewer.interactiveModes.endUpdate();
}
private updateEnabled = (index: number, viewer: lt.Controls.ImageViewer): void => {
// The enabled interactive mode will be the only one enabled regardless of position in the list
// So if Magnify Glass is enabled and PanZoom is not, only Magnify Glass can do work.
viewer.interactiveModes.enable(viewer.interactiveModes.item(index));
}
}
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 ImageViewerInteractiveMode_EnableExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
// Create a select box
const output = document.getElementById("output");
const select = document.createElement("select");
output.appendChild(select);
// Signal that interactive modes are being updated and should all be stopped.
viewer.interactiveModes.beginUpdate();
viewer.interactiveModes.clearItems();
// Add two new interactive modes
const panZoomMode = new lt.Controls.ImageViewerPanZoomInteractiveMode();
viewer.interactiveModes.add(panZoomMode);
const magnifyGlassMode = new lt.Controls.ImageViewerMagnifyGlassInteractiveMode();
viewer.interactiveModes.add(magnifyGlassMode);
// Add options for each to be selected
for (let i = 0; i < viewer.interactiveModes.count; i++) {
const option = document.createElement("option");
option.innerHTML = viewer.interactiveModes.item(i).name;
select.appendChild(option);
}
select.addEventListener("change", () => {
this.updateEnabled(select.selectedIndex, viewer);
});
// Start with panZoom mode
select.selectedIndex = 0;
this.updateEnabled(select.selectedIndex, viewer);
// End updates
viewer.interactiveModes.endUpdate();
}
updateEnabled = (index, viewer) => {
// The enabled interactive mode will be the only one enabled regardless of position in the list
// So if Magnify Glass is enabled and PanZoom is not, only Magnify Glass can do work.
viewer.interactiveModes.enable(viewer.interactiveModes.item(index));
}
}
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 | Enable</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.InteractiveMode.Enable();
};
</script>
</html>
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