TreeViewItem.OnMouseLeftButtonDown Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Provides handling for the MouseLeftButtonDown event.
Namespace: System.Windows.Controls
Assembly: System.Windows.Controls (in System.Windows.Controls.dll)
Syntax
'Declaration
Protected Overrides Sub OnMouseLeftButtonDown ( _
e As MouseButtonEventArgs _
)
protected override void OnMouseLeftButtonDown(
MouseButtonEventArgs e
)
Parameters
- e
Type: System.Windows.Input.MouseButtonEventArgs
A MouseButtonEventArgs that contains the event data.
Remarks
The OnMouseLeftButtonDown method is called before any event handler for the MouseLeftButtonDown 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 when the left mouse button is pressed while the mouse pointer is over a TreeViewItem that currently does not have focus, and focus can be passes to that item.
Notes to Inheritors
If you override OnMouseLeftButtonDown, you can prevent registered delegates from receiving events by setting Handled to true. For more information about routed events and the Handled property, see Events Overview for Silverlight.
Version Information
Silverlight
Supported in: 5, 4, 3
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.