WorkflowDesignerMessageFilter.OnKeyDown(KeyEventArgs) Metode

Definisi

Ruang nama:

System.Workflow.ComponentModel.Design

Rakitan:

System.Workflow.ComponentModel.dll

Terjadi ketika tombol ditekan.

protected:
 virtual bool OnKeyDown(System::Windows::Forms::KeyEventArgs ^ eventArgs);

protected virtual bool OnKeyDown (System.Windows.Forms.KeyEventArgs eventArgs);

abstract member OnKeyDown : System.Windows.Forms.KeyEventArgs -> bool
override this.OnKeyDown : System.Windows.Forms.KeyEventArgs -> bool

Protected Overridable Function OnKeyDown (eventArgs As KeyEventArgs) As Boolean

Parameter

eventArgs

KeyEventArgs

yang KeyEventArgs berisi informasi tentang peristiwa tersebut.

Mengembalikan

Boolean

true jika pesan ditangani; jika tidak, false.

Contoh

Contoh kode berikut menunjukkan cara mengambil OnKeyDown alih metode untuk menyesuaikan cara menghapus aktivitas dari permukaan desain alur kerja.

Contoh kode ini adalah bagian dari Sampel SDK Hosting Designer Dasar dari file DesignerShell.cs. Untuk informasi selengkapnya, lihat Hosting Designer Dasar.

protected override bool OnKeyDown(KeyEventArgs eventArgs)
{
    if (eventArgs.KeyCode == Keys.Delete)
    {
        ISelectionService selectionService = (ISelectionService)serviceProvider.GetService(typeof(ISelectionService));
        if (selectionService != null && selectionService.PrimarySelection is CodeActivity)
        {
            CodeActivity codeActivityComponent = (CodeActivity)selectionService.PrimarySelection;
            CompositeActivity parentActivity = codeActivityComponent.Parent;
            if (parentActivity != null)
            {
                parentActivity.Activities.Remove(codeActivityComponent);
                this.ParentView.Update();
            }
            loader.RemoveActivityFromDesigner(codeActivityComponent);
        }
    }
    return true;
}

Protected Overrides Function OnKeyDown(ByVal eventArgs As KeyEventArgs) As Boolean
    If eventArgs.KeyCode = Keys.Delete Then
        Dim selectionService As ISelectionService = CType(serviceProvider.GetService(GetType(ISelectionService)), ISelectionService)
        If selectionService IsNot Nothing AndAlso TypeOf selectionService.PrimarySelection Is CodeActivity Then
            Dim codeActivityComponent As CodeActivity = CType(selectionService.PrimarySelection, CodeActivity)
            Dim parentActivity As CompositeActivity = codeActivityComponent.Parent
            If parentActivity IsNot Nothing Then
                parentActivity.Activities.Remove(codeActivityComponent)
                Me.ParentView.Update()
            End If
            loader.RemoveActivityFromDesigner(codeActivityComponent)
        End If
    End If
    Return True
End Function

Keterangan

OnKeyDown terjadi ketika tombol ditekan ketika objek tertentu memiliki fokus.

Lihat juga

• Hosting Designer Dasar