DesignerGlyph.CanBeActivated Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan nilai yang menunjukkan apakah DesignerGlyph dapat memperoleh fokus pada ActivityDesigner yang terkait dengannya.
public:
virtual property bool CanBeActivated { bool get(); };
public virtual bool CanBeActivated { get; }
member this.CanBeActivated : bool
Public Overridable ReadOnly Property CanBeActivated As Boolean
Nilai Properti
true
jika glyph desainer dapat diaktifkan; jika tidak, false
. Default adalah false
.
Contoh
Contoh berikut menunjukkan implementasi properti CanBeActivated. Contoh ini berasal dari sampel SDK Desainer Profil Pelacakan. Untuk informasi selengkapnya, lihat Sampel Perancang Profil Pelacakan.
/// <summary>
/// This glyph shows that the activity's track point is not correctly configured
/// </summary>
internal sealed class ErrorActivityGlyph : DesignerGlyph
{
static Bitmap image = Resources.error;
string errorMessage;
internal ErrorActivityGlyph(string errorMessage)
{
this.errorMessage = errorMessage;
}
public override bool CanBeActivated
{
get
{
return true;
}
}
/// <summary>
/// Display an error message when this glyph is clicked
/// </summary>
/// <param name="designer"></param>
protected override void OnActivate(ActivityDesigner designer)
{
MessageBox.Show(errorMessage);
}
public override Rectangle GetBounds(ActivityDesigner designer, bool activated)
{
Rectangle imageBounds = new Rectangle();
if (image != null)
{
imageBounds.Size = image.Size;
imageBounds.Location = new Point(designer.Bounds.Right - imageBounds.Size.Width / 4, designer.Bounds.Top - imageBounds.Size.Height / 2);
}
return imageBounds;
}
protected override void OnPaint(Graphics graphics, bool activated, AmbientTheme ambientTheme, ActivityDesigner designer)
{
image.MakeTransparent(Color.FromArgb(255, 255, 255));
if (image != null)
{
graphics.DrawImage(image, GetBounds(designer, activated), new Rectangle(Point.Empty, image.Size), GraphicsUnit.Pixel);
}
}
}
' This glyph shows that the activity's track point is not correctly configured
Friend NotInheritable Class ErrorActivityGlyph
Inherits DesignerGlyph
Shared image As Bitmap = Resources.errorIcon
Dim errorMessage As String
Friend Sub New(ByVal errorMessage As String)
Me.errorMessage = errorMessage
End Sub
Public Overrides ReadOnly Property CanBeActivated() As Boolean
Get
Return True
End Get
End Property
' Display an error message when this glyph is clicked
Protected Overrides Sub OnActivate(ByVal designer As ActivityDesigner)
MessageBox.Show(errorMessage)
End Sub
Public Overrides Function GetBounds(ByVal designer As ActivityDesigner, ByVal activated As Boolean) As Rectangle
Dim imageBounds As New Rectangle()
If image IsNot Nothing Then
imageBounds.Size = image.Size
imageBounds.Location = New Point(designer.Bounds.Right - imageBounds.Size.Width / 4, designer.Bounds.Top - imageBounds.Size.Height / 2)
End If
Return imageBounds
End Function
Protected Overrides Sub OnPaint(ByVal graphics As Graphics, ByVal activated As Boolean, ByVal ambientTheme As AmbientTheme, ByVal designer As ActivityDesigner)
image.MakeTransparent(Color.FromArgb(255, 255, 255))
If image IsNot Nothing Then
graphics.DrawImage(image, GetBounds(designer, activated), New Rectangle(Point.Empty, image.Size), GraphicsUnit.Pixel)
End If
End Sub
End Class