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DrawingControl.MouseDown Event

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Visio Automation Reference

Occurs when a mouse button is clicked.

Version Information
 Version Added:  Visio 2003

Syntax

Private Sub expression_MouseDown(ByVal Button As Long, ByVal KeyButtonState As Long, ByVal x As Double, ByVal y As Double, ByVal CancelDefault As Boolean)

expression   A variable that represents a DrawingControl object.

Parameters

Name Required/Optional Data Type Description
Button Required Long The mouse button that was pressed. See Remarks for possible values.
KeyButtonState Required Long The state of the mouse buttons and the SHIFT and CTRL keys for the event. See Remarks for possible values.
x Required Double The x-coordinate of the mouse pointer.
y Required Double The y-coordinate of the mouse pointer.
CancelDefault Required Boolean False if Microsoft Office Visio should process the message it receives from this event; otherwise, True.

Remarks

Possible values for Button are shown in the following table, and are declared in VisKeyButtonFlags in the Visio type library.

Constant Value

visMouseLeft

1

visMouseMiddle

16

visMouseRight

2

Possible values for KeyButtonState can be a combination of the values shown in the following table, which are declared in VisKeyButtonFlags in the Visio type library. For example, if KeyButtonState returns 9, it indicates that the user clicked the left mouse button while pressing CTRL.

Constant Value

visKeyControl

8

visKeyShift

4

visMouseLeft

1

visMouseMiddle

16

visMouseRight

2

If you set CancelDefault to True, Visio will not process the message received when the mouse button is clicked.

Unlike some other Visio events, MouseDown does not have the prefix "Query," but it is nevertheless a query event. That is, you can cancel processing the message sent by MouseDown, either by setting CancelDefault to True, or, if you are using theVisEventProc method to handle the event, by returning True. For more information, see the topics for the VisEventProc method and for any of the query events (for example, the QueryCancelSuspend event) in this reference.

If you are using Microsoft Visual Basic or Visual Basic for Applications (VBA), the syntax in this topic describes a common, efficient way to handle events.

If you want to create your own Event objects, use the Add or AddAdvise method. To create an Event object that runs an add-on, use the Add method as it applies to the EventList collection. To create an Event object that receives notification, use the AddAdvise method. To find an event code for the event you want to create, see Event codes.

Example

This class module shows how to define a sink class called MouseListener that listens for events fired by mouse actions in the active window. It declares the object variable vsoWindow by using the WithEvents keyword. The class module also contains event handlers for the MouseDown, MouseMove, and MouseUp events.

To run this example, insert a new class module in your VBA project, name it MouseListener, and insert the following code in the module.

Visual Basic for Applications 
  Dim WithEvents vsoWindow As Visio.Window

Private Sub Class_Initialize()


Set vsoWindow = ActiveWindow



End Sub


Private Sub Class_Terminate()


Set vsoWindow = Nothing



End Sub


Private Sub vsoWindow_MouseDown(ByVal Button As Long, ByVal KeyButtonState As Long, ByVal x As Double, ByVal y As Double, CancelDefault As Boolean)


If Button = 1 Then

    Debug.Print "Left mouse button clicked"

ElseIf Button = 2 Then

    Debug.Print "Right mouse button clicked"
    
ElseIf Button = 16 Then

    Debug.Print "Center mouse button clicked"
    
End If
    



End Sub


Private Sub vsoWindow_MouseMove(ByVal Button As Long, ByVal KeyButtonState As Long, ByVal x As Double, ByVal y As Double, CancelDefault As Boolean)


Debug.Print "x-position is "; x
Debug.Print "y-position is "; y
        



End Sub


Private Sub vsoWindow_MouseUp(ByVal Button As Long, ByVal KeyButtonState As Long, ByVal x As Double, ByVal y As Double, CancelDefault As Boolean)


If Button = 1 Then

    Debug.Print "Left mouse button released"

ElseIf Button = 2 Then

    Debug.Print "Right mouse button released"
    
ElseIf Button = 16 Then

    Debug.Print "Center mouse button released"
    
End If
    



End Sub

Then, insert the following code in the ThisDocument project.

Visual Basic for Applications 
  Dim myMouseListener As MouseListener

Private Sub Document_DocumentSaved(ByVal doc As IVDocument)


Set myMouseListener = New MouseListener



End Sub


Private Sub Document_BeforeDocumentClose(ByVal doc As IVDocument)


Set myMouseListener = Nothing



End Sub

Save the document to initialize the class, and then click anywhere in the active window to fire a MouseDown event. In the Immediate window, the handler prints the name of the mouse button that was clicked to fire the event.

See Also