使用UIAutomation处理ProgressBar的值更改 [英] Handling ProgressBar's Value change with UIAutomation
本文介绍了使用UIAutomation处理ProgressBar的值更改的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
当.NET UIAutomation框架更改ProgressBar的值时,如何通知我?我在AutomationElement类中没有看到这样的属性.
How can I be notified when ProgressBar's Value changes with .NET UIAutomation framework? I dont see such property in AutomationElement class.
推荐答案
I drew this sample directly from the MSDN documentation, changing only the property:
AutomationPropertyChangedEventHandler propChangeHandler;
/// <summary>
/// Adds a handler for property-changed event; in particular, a change in the value
/// </summary>
/// <param name="element">The UI Automation element whose state is being monitored.</param>
public void SubscribePropertyChange(AutomationElement element)
{
Automation.AddAutomationPropertyChangedEventHandler(element,
TreeScope.Element,
propChangeHandler = new AutomationPropertyChangedEventHandler(OnPropertyChange),
ValuePattern.ValueProperty);
}
/// <summary>
/// Handler for property changes.
/// </summary>
/// <param name="src">The source whose properties changed.</param>
/// <param name="e">Event arguments.</param>
private void OnPropertyChange(object src, AutomationPropertyChangedEventArgs e)
{
AutomationElement sourceElement = src as AutomationElement;
if (e.Property == ValuePattern.ValueProperty)
{
// TODO: Do something with the new value.
// The element that raised the event can be identified by its runtime ID property.
}
else
{
// TODO: Handle other property-changed events.
}
}
public void UnsubscribePropertyChange(AutomationElement element)
{
if (propChangeHandler != null)
{
Automation.RemoveAutomationPropertyChangedEventHandler(element, propChangeHandler);
}
}
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