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InkCollectorCursorButtonDownEventHandler Delegate

Represents the method that handles the CursorButtonDown event of an InkCollector object.

Namespace:  Microsoft.Ink
Assembly:  Microsoft.Ink (in Microsoft.Ink.dll)

public delegate void InkCollectorCursorButtonDownEventHandler(
	Object sender,
	InkCollectorCursorButtonDownEventArgs e
)

Parameters

sender
Type: System.Object

The source InkCollector object for this event.

e
Type: Microsoft.Ink.InkCollectorCursorButtonDownEventArgs

The InkCollectorCursorButtonDownEventArgs object that contains the event data.

A button on a pen tip is down when the user lowers the pen to the digitizer and starts tracing a stroke. A button on a pen barrel is down when the button is pressed.

When you create an InkCollectorCursorButtonDownEventHandler delegate, you identify the method that handles the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For performance reasons, the default event interest is off but is turned on automatically in managed code if you add an event handler.

When you press the right mouse button, you actually receive two CursorButtonDown events—one for right button pressed and one for left button pressed.

The following example shows how you can subscribe to the CursorInRange event, CursorButtonDown event, and the CursorButtonUp event in order to have the ink pointer (when inking with the mouse) be displayed using a different color than the ink itself.

When the CursorInRange event fires, a check is made to see if this is the first time that the InkCollector object has come in contact with this particular Cursor object. If so, the DrawingAttributes property is assigned with a clone of the DefaultDrawingAttributes property. This ensures that subsequent access to the DrawingAttributes property does not throw a null reference exception. If the mouse is being used, the ink color is set to red.

private void mInkObject_CursorInRange(object sender, InkCollectorCursorInRangeEventArgs e)
{
    const int MOUSE_CURSOR_ID = 1;

    if (e.NewCursor)
    {
        // mInkObject can be InkCollector, InkOverlay, or InkPicture
        e.Cursor.DrawingAttributes = mInkObject.DefaultDrawingAttributes.Clone();
        // if this cursor is the mouse, we'll set color to red 
        if (MOUSE_CURSOR_ID == e.Cursor.Id)
        {
            e.Cursor.DrawingAttributes.Color = Color.Red;
        }
    }
}

When the CursorButtonDown event fires, a check is made to see if the Cursor object supplied to the event is the mouse. If so, the Color property is to set to blue.

private void mInkObject_CursorButtonDown(object sender, InkCollectorCursorButtonDownEventArgs e)
{
    const int MOUSE_CURSOR_ID = 1;

    if (MOUSE_CURSOR_ID == e.Cursor.Id)
    {
        e.Cursor.DrawingAttributes.Color = Color.Blue;
    }

}

When the CursorButtonUp event fires, a check is made to see if the Cursor object supplied to the event is the mouse. If so, the Color property is to set back to red.

private void mInkObject_CursorButtonUp(object sender, InkCollectorCursorButtonUpEventArgs e)
{
    const int MOUSE_CURSOR_ID = 1;

    if (MOUSE_CURSOR_ID == e.Cursor.Id)
    {
        e.Cursor.DrawingAttributes.Color = Color.Red;
    }
}

Windows 7, Windows Vista, Windows Server 2008 R2, Windows Server 2008

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.0

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