propertyChanged Event (ImageViewer)
Summary
Occurs when a property value in this ImageViewerchanges.
Syntax
JavaScript Syntax
Object.defineProperty(ImageViewer.prototype,'propertyChanged',get: function(),set: function(value))function propertyChanged.add(function(sender, e));function propertyChanged.remove(function(sender, e));
TypeScript Syntax
propertyChanged: void;Remarks
Most of the properties of this ImageViewer will fire the PropertyChanged event when the value changes. When this happens, the value of PropertyChangedEventArgs.PropertyName of the event data will be set to the name of the property that was changed. For example, the PropertyChangedEventArgs.PropertyName will be set to "UseDpi" when UseDpi changes and "ScrollOffset" when ScrollOffset changes.
Example
Run the demo and now as you click the Example button, the label is updated.
Start with the ImageViewer example, remove all the code inside the example function (search for the "// TODO: add example code here" comment) and insert the following code:
JavaScript Example
var _this = this;if (this._firstCall){this._firstCall = false;// Subscribe to PropertyChanged eventthis._imageViewer.propertyChanged.add(function(sender, e) {if (e.propertyName == "flip") {var infoLabel = document.getElementById("infoLabel");if (_this._imageViewer.flip) {infoLabel.textContent = "Image is flipped";} else {infoLabel.textContent = "Image is not flipped";}}});}// Change the flip state of the imagethis._imageViewer.flip = !this._imageViewer.flip;
Event Data
| Parameter | Type | Description |
|---|---|---|
| sender | var | The source of the event. |
| e | PropertyChangedEventArgs | The event data. |
Requirements
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© 1991-2017 LEAD Technologies, Inc. All Rights Reserved.
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