TreeView.ShowLines Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

TreeView.cs

Mendapatkan atau menetapkan nilai yang menunjukkan apakah garis digambar di antara simpul pohon dalam kontrol tampilan pohon.

public:
 property bool ShowLines { bool get(); void set(bool value); };

public bool ShowLines { get; set; }

member this.ShowLines : bool with get, set

Public Property ShowLines As Boolean

Nilai Properti

Boolean

true jika garis digambar di antara simpul pohon dalam kontrol tampilan pohon; jika tidak, false. Defaultnya adalah true.

Contoh

Contoh kode berikut mengilustrasikan yang dikustomisasi TreeView. Dengan mewarisi TreeView kelas , versi kustom ini memiliki semua fungsionalitas dari khas TreeView. Mengubah berbagai nilai properti dalam konstruktor memberikan tampilan yang unik. ShowPlusMinus Karena properti diatur ke false, kontrol yang disesuaikan juga mengambil alih OnAfterSelect metode sehingga simpul dapat diperluas dan diciutkan saat diklik.

Kontrol yang disesuaikan dengan cara ini dapat digunakan di seluruh organisasi, sehingga memudahkan untuk menyediakan antarmuka yang konsisten tanpa mengharuskan properti kontrol ditentukan dalam setiap proyek individu.

public ref class CustomizedTreeView: public TreeView
{
public:
   CustomizedTreeView()
   {

      // Customize the TreeView control by setting various properties.
      BackColor = System::Drawing::Color::CadetBlue;
      FullRowSelect = true;
      HotTracking = true;
      Indent = 34;
      ShowPlusMinus = false;

      // The ShowLines property must be false for the FullRowSelect
      // property to work.
      ShowLines = false;
   }

protected:
   virtual void OnAfterSelect( TreeViewEventArgs^ e ) override
   {
      // Confirm that the user initiated the selection.
      // This prevents the first node from expanding when it is
      // automatically selected during the initialization of
      // the TreeView control.
      if ( e->Action != TreeViewAction::Unknown )
      {
         if ( e->Node->IsExpanded )
         {
            e->Node->Collapse();
         }
         else
         {
            e->Node->Expand();
         }
      }

      
      // Remove the selection. This allows the same node to be
      // clicked twice in succession to toggle the expansion state.
      SelectedNode = nullptr;
   }
};

public class CustomizedTreeView : TreeView
{
    public CustomizedTreeView()
    {
        // Customize the TreeView control by setting various properties.
        BackColor = System.Drawing.Color.CadetBlue;
        FullRowSelect = true;
        HotTracking = true;
        Indent = 34;
        ShowPlusMinus = false;

        // The ShowLines property must be false for the FullRowSelect 
        // property to work.
        ShowLines = false;
    }

    protected override void OnAfterSelect(TreeViewEventArgs e)
    {
        // Confirm that the user initiated the selection.
        // This prevents the first node from expanding when it is
        // automatically selected during the initialization of 
        // the TreeView control.
        if (e.Action != TreeViewAction.Unknown)
        {
            if (e.Node.IsExpanded) 
            {
                e.Node.Collapse();
            }
            else 
            {
                e.Node.Expand();
            }
        }

        // Remove the selection. This allows the same node to be
        // clicked twice in succession to toggle the expansion state.
        SelectedNode = null;
    }
}

Public Class CustomizedTreeView
    Inherits TreeView

    Public Sub New()
        ' Customize the TreeView control by setting various properties.
        BackColor = System.Drawing.Color.CadetBlue
        FullRowSelect = True
        HotTracking = True
        Indent = 34
        ShowPlusMinus = False

        ' The ShowLines property must be false for the FullRowSelect 
        ' property to work.
        ShowLines = False
    End Sub


    Protected Overrides Sub OnAfterSelect(ByVal e As TreeViewEventArgs)
        ' Confirm that the user initiated the selection.
        ' This prevents the first node from expanding when it is
        ' automatically selected during the initialization of 
        ' the TreeView control.
        If e.Action <> TreeViewAction.Unknown Then
            If e.Node.IsExpanded Then
                e.Node.Collapse()
            Else
                e.Node.Expand()
            End If
        End If

        ' Remove the selection. This allows the same node to be
        ' clicked twice in succession to toggle the expansion state.
        SelectedNode = Nothing
    End Sub

End Class

Keterangan

Jika ShowLines diatur ke true, FullRowSelect properti diabaikan.