ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Layouts Namespace / LayoutTool Class / OnToolMouseDown Method
A LayoutViewMouseButtonEventArgs that contains the event data.

OnToolMouseDown Method (LayoutTool)
Occurs when a mouse button is pressed on the view.
Syntax
protected virtual void OnToolMouseDown( 
   LayoutViewMouseButtonEventArgs args
)

Parameters

args
A LayoutViewMouseButtonEventArgs that contains the event data.
Remarks
This method is intended to perform synchronous operations associated with a mouse down event. To perform any asynchronous operations set the handled property on the LayoutViewMouseButtonEventArgs to true and override the HandleMouseDownAsync virtual method.
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.9 or higher.
See Also