LEADTOOLS Annotations (Leadtools.Annotations assembly)
LEAD Technologies, Inc

KeyDown Event






An event that triggers when a key is pressed when your control has focus.
Syntax
event KeyEventHandler KeyDown
'Declaration
 
Event KeyDown As KeyEventHandler
'Usage
 
Dim instance As IAnnAutomationControl
Dim handler As KeyEventHandler
 
AddHandler instance.KeyDown, handler
event KeyEventHandler KeyDown
add_KeyDown(function(sender, e))
remove_KeyDown(function(sender, e))

event KeyEventHandler^ KeyDown
Event Data

The event handler receives an argument of type KeyEventArgs containing data related to this event. The following KeyEventArgs properties provide information specific to this event.

PropertyDescription
Alt Gets a value indicating whether the ALT key was pressed.
Control Gets a value indicating whether the CTRL key was pressed.
Handled Gets or sets a value indicating whether the event was handled.
KeyCode Gets the keyboard code for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
KeyData Gets the key data for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
KeyValue Gets the keyboard value for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
Modifiers Gets the modifier flags for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event. The flags indicate which combination of CTRL, SHIFT, and ALT keys was pressed.
Shift Gets a value indicating whether the SHIFT key was pressed.
SuppressKeyPress Gets or sets a value indicating whether the key event should be passed on to the underlying control.
Remarks

If your control is derived from the standard System.Windows.Forms.Control, then you do not need to implement this event (since the default System.Windows.Forms.Control.KeyDown will be used).

Example
For an example, refer to IAnnAutomationControl.
Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

IAnnAutomationControl Interface
IAnnAutomationControl Members

 

 


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