InkPicture.CursorInRange - событие

Статья
11/04/2008

Обновлен: Ноябрь 2007

Occurs when a cursor enters the physical detection range (proximity) of the tablet context.

Пространство имен: Microsoft.Ink
Сборка: Microsoft.Ink (в Microsoft.Ink.dll)

Синтаксис

'Декларация
Public Event CursorInRange As InkCollectorCursorInRangeEventHandler
'Применение
Dim instance As InkPicture
Dim handler As InkCollectorCursorInRangeEventHandler

AddHandler instance.CursorInRange, handler

public event InkCollectorCursorInRangeEventHandler CursorInRange

public:
 event InkCollectorCursorInRangeEventHandler^ CursorInRange {
    void add (InkCollectorCursorInRangeEventHandler^ value);
    void remove (InkCollectorCursorInRangeEventHandler^ value);
}

/** @event */
public void add_CursorInRange (InkCollectorCursorInRangeEventHandler value)
/** @event */
public void remove_CursorInRange (InkCollectorCursorInRangeEventHandler value)

JScript не поддерживает события.

Заметки

The event handler receives an argument of type InkCollectorCursorInRangeEventArgs that contains data about this event.

When you create a InkCollectorCursorInRangeEventHandler 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 if you add an event handler.

The CursorInRange event fires even when in select or erase mode, not only when in ink mode. This requires that you monitor the editing mode (which you are responsible for setting) and be aware of the mode before interpreting the event. The advantage of this requirement is greater freedom to innovate on the platform through greater awareness of platform events.

Примеры

In this example, when the CursorInRange event fires, a check is made to see if this is the first time that the InkPicture 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.

Private Sub mInkObject_CursorInRange(ByVal sender As Object, ByVal e As InkCollectorCursorInRangeEventArgs)
    Const MOUSE_CURSOR_ID As Integer = 1
    If e.NewCursor Then
        ' 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) Then
            e.Cursor.DrawingAttributes.Color = Color.Red
        End If

    End If
End Sub

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;
        }
    }
}

Платформы

Windows Vista

Среды .NET Framework и .NET Compact Framework поддерживают не все версии каждой платформы. Поддерживаемые версии перечислены в разделе Требования к системе для .NET Framework.