Determines how the control displays and uses scrollbars.
lt.Controls.ControlScrollMode = {
auto: 0,
hidden: 1,
disabled: 2
}
lt.Controls.ControlScrollMode = {
auto: 0,
hidden: 1,
disabled: 2
}
0 |
Auto |
(0) Auto scrollbars, if the control requires scroll bars they will be visible and active. Only available if the platform supports scrollbars, otherwise, using this value is the same as using ControlScrollMode.Hidden. |
1 |
Hidden |
(1) Do not show scrollbars, even if the control requires them/ |
2 |
Disabled |
(2) Disable scrolling, the scrollbars will not be visible nor activated even if the control requires them. |
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewer_ScrollModeExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
// Zoom in so we can see scroll bars for the example
viewer.zoom(1.5, lt.Controls.ControlSizeMode.fit, viewer.defaultZoomOrigin);
const scrollModes = ["Auto", "Hidden", "Disabled"];
const output = document.getElementById("output");
const textOutput = document.createElement("p");
output.appendChild(textOutput);
const updateOutput = () => {
textOutput.innerHTML = "ScrollMode: " + scrollModes[viewer.scrollMode];
}
updateOutput();
// Add a button to update the scroll mode
const button = document.createElement("button");
button.innerHTML = "Change Scroll Mode";
button.onclick = () => {
// Flip through the options
viewer.scrollMode = (viewer.scrollMode + 1) % scrollModes.length;
// Allow movement all over the view while we're at it when hidden
if (viewer.scrollMode === lt.Controls.ControlScrollMode.hidden)
viewer.restrictScroll = false;
else
viewer.restrictScroll = true;
updateOutput();
};
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_ScrollModeExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
// Zoom in so we can see scroll bars for the example
viewer.zoom(1.5, lt.Controls.ControlSizeMode.fit, viewer.defaultZoomOrigin);
const scrollModes = ["Auto", "Hidden", "Disabled"];
const output = document.getElementById("output");
const textOutput = document.createElement("p");
output.appendChild(textOutput);
const updateOutput = () => {
textOutput.innerHTML = "ScrollMode: " + scrollModes[viewer.scrollMode];
}
updateOutput();
// Add a button to update the scroll mode
const button = document.createElement("button");
button.innerHTML = "Change Scroll Mode";
button.onclick = () => {
// Flip through the options
viewer.scrollMode = (viewer.scrollMode + 1) % scrollModes.length;
// Allow movement all over the view while we're at it when hidden
if (viewer.scrollMode === lt.Controls.ControlScrollMode.hidden)
viewer.restrictScroll = false;
else
viewer.restrictScroll = true;
updateOutput();
};
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 | ScrollMode</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.ScrollMode();
};
</script>
</html>
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