OnMouseLeftButtonDown Method

TextBox.OnMouseLeftButtonDown Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Called before MouseLeftButtonDown event occurs.

Namespace:  System.Windows.Controls
Assembly:  System.Windows (in System.Windows.dll)

protected override void OnMouseLeftButtonDown(
	MouseButtonEventArgs e
)

Parameters

e
Type: System.Windows.Input.MouseButtonEventArgs
The data for the event.

The OnMouseLeftButtonDown method is called before any event handler for the MouseLeftButtonDown event is called. This method allows derived classes to handle the MouseLeftButtonDown event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

This implementation marks the MouseLeftButtonDown event as handled by setting the Handled property of the event data to true.

TextBox handles cursor placement and selection in MouseLeftButtonDown event. Derived classes can prevent the TextBox from processing the TextBox event by setting the Handled property of the event data to true.

Notes to Inheritors

When overriding OnMouseLeftButtonDown method in a derived class, be sure to call the base class’s OnMouseLeftButtonDown method so that registered delegates receive the event.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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