TreeNodeStates Enum

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Mendefinisikan konstanta yang mewakili kemungkinan status TreeNode.

Enumerasi ini mendukung kombinasi bitwise dari nilai yang termasuk di dalamnya.

public enum class TreeNodeStates

[System.Flags]
public enum TreeNodeStates

[<System.Flags>]
type TreeNodeStates = 

Public Enum TreeNodeStates

Warisan

Object

ValueType

Enum

TreeNodeStates

Atribut

FlagsAttribute

Bidang

Checked	8	Simpul diperiksa.
Default	32	Simpul dalam keadaan default.
Focused	16	Simpul memiliki fokus.
Grayed	2	Simpul dinonaktifkan.
Hot	64	Node panas. Status ini terjadi ketika HotTracking properti diatur ke true dan penunjuk mouse berada di atas simpul.
Indeterminate	256	Simpul dalam status yang tidak ditentukan.
Marked	128	Simpul ditandai.
Selected	1	Simpul dipilih.
ShowKeyboardCues	512	Simpul harus menunjukkan pintasan keyboard.

Contoh

Contoh berikut menunjukkan cara mengkustomisasi TreeView kontrol menggunakan gambar pemilik. TreeView Kontrol dalam contoh menampilkan tag simpul opsional bersama label simpul normal. Tag simpul ditentukan menggunakan TreeNode.Tag properti . Kontrol ini TreeView juga menggunakan warna kustom, termasuk warna sorotan kustom.

Anda dapat menyesuaikan sebagian TreeView besar warna dengan mengatur properti warna, tetapi warna sorotan pilihan tidak tersedia sebagai properti. Selain itu, persegi panjang sorotan pilihan default hanya meluas di sekitar label simpul. Gambar pemilik harus digunakan untuk menggambar tag simpul dan untuk menggambar persegi panjang sorotan yang disesuaikan cukup besar untuk menyertakan tag simpul.

Dalam contoh, handler untuk TreeView.DrawNode peristiwa menggambar simpul yang tidak dipilih dengan memanggil metode DrawTreeNodeEventArgs kelas. Metode ini memberikan tampilan default untuk TreeView elemen yang tidak memerlukan penyesuaian. Handler menggambar tag simpul dan sorotan pilihan kustom secara manual.

Untuk contoh lengkapnya, lihat TreeView.DrawNode topik referensi.

   // Draws a node.
private:
   void myTreeView_DrawNode( Object^ sender, DrawTreeNodeEventArgs^ e )
   {
      // Draw the background and node text for a selected node.
      if ( (e->State & TreeNodeStates::Selected) != (TreeNodeStates)0 )
      {
         // Draw the background of the selected node. The NodeBounds
         // method makes the highlight rectangle large enough to
         // include the text of a node tag, if one is present.
         e->Graphics->FillRectangle( Brushes::Green, NodeBounds( e->Node ) );

         // Retrieve the node font. If the node font has not been set,
         // use the TreeView font.
         System::Drawing::Font^ nodeFont = e->Node->NodeFont;
         if ( nodeFont == nullptr )
                  nodeFont = (dynamic_cast<TreeView^>(sender))->Font;

         // Draw the node text.
         e->Graphics->DrawString( e->Node->Text, nodeFont, Brushes::White, Rectangle::Inflate( e->Bounds, 2, 0 ) );
      }
      // Use the default background and node text.
      else
      {
         e->DrawDefault = true;
      }

      // If a node tag is present, draw its string representation 
      // to the right of the label text.
      if ( e->Node->Tag != nullptr )
      {
         e->Graphics->DrawString( e->Node->Tag->ToString(), tagFont, Brushes::Yellow, (float)e->Bounds.Right + 2, (float)e->Bounds.Top );
      }

      
      // If the node has focus, draw the focus rectangle large, making
      // it large enough to include the text of the node tag, if present.
      if ( (e->State & TreeNodeStates::Focused) != (TreeNodeStates)0 )
      {
         Pen^ focusPen = gcnew Pen( Color::Black );
         try
         {
            focusPen->DashStyle = System::Drawing::Drawing2D::DashStyle::Dot;
            Rectangle focusBounds = NodeBounds( e->Node );
            focusBounds.Size = System::Drawing::Size( focusBounds.Width - 1, focusBounds.Height - 1 );
            e->Graphics->DrawRectangle( focusPen, focusBounds );
         }
         finally
         {
            if ( focusPen )
               delete safe_cast<IDisposable^>(focusPen);
         }

      }
   }

// Draws a node.
private void myTreeView_DrawNode(
    object sender, DrawTreeNodeEventArgs e)
{
    // Draw the background and node text for a selected node.
    if ((e.State & TreeNodeStates.Selected) != 0)
    {
        // Draw the background of the selected node. The NodeBounds
        // method makes the highlight rectangle large enough to
        // include the text of a node tag, if one is present.
        e.Graphics.FillRectangle(Brushes.Green, NodeBounds(e.Node));

        // Retrieve the node font. If the node font has not been set,
        // use the TreeView font.
        Font nodeFont = e.Node.NodeFont;
        if (nodeFont == null) nodeFont = ((TreeView)sender).Font;

        // Draw the node text.
        e.Graphics.DrawString(e.Node.Text, nodeFont, Brushes.White,
            Rectangle.Inflate(e.Bounds, 2, 0));
    }

    // Use the default background and node text.
    else 
    {
        e.DrawDefault = true;
    }

    // If a node tag is present, draw its string representation 
    // to the right of the label text.
    if (e.Node.Tag != null)
    {
        e.Graphics.DrawString(e.Node.Tag.ToString(), tagFont,
            Brushes.Yellow, e.Bounds.Right + 2, e.Bounds.Top);
    }

    // If the node has focus, draw the focus rectangle large, making
    // it large enough to include the text of the node tag, if present.
    if ((e.State & TreeNodeStates.Focused) != 0)
    {
        using (Pen focusPen = new Pen(Color.Black))
        {
            focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
            Rectangle focusBounds = NodeBounds(e.Node);
            focusBounds.Size = new Size(focusBounds.Width - 1, 
            focusBounds.Height - 1);
            e.Graphics.DrawRectangle(focusPen, focusBounds);
        }
    }
}

' Draws a node.
Private Sub myTreeView_DrawNode(ByVal sender As Object, _
    ByVal e As DrawTreeNodeEventArgs) Handles myTreeView.DrawNode

    ' Draw the background and node text for a selected node.
    If (e.State And TreeNodeStates.Selected) <> 0 Then

        ' Draw the background of the selected node. The NodeBounds
        ' method makes the highlight rectangle large enough to
        ' include the text of a node tag, if one is present.
        e.Graphics.FillRectangle(Brushes.Green, NodeBounds(e.Node))

        ' Retrieve the node font. If the node font has not been set,
        ' use the TreeView font.
        Dim nodeFont As Font = e.Node.NodeFont
        If nodeFont Is Nothing Then
            nodeFont = CType(sender, TreeView).Font
        End If

        ' Draw the node text.
        e.Graphics.DrawString(e.Node.Text, nodeFont, Brushes.White, _
            e.Bounds.Left - 2, e.Bounds.Top)

    ' Use the default background and node text.
    Else
        e.DrawDefault = True
    End If

    ' If a node tag is present, draw its string representation 
    ' to the right of the label text.
    If (e.Node.Tag IsNot Nothing) Then
        e.Graphics.DrawString(e.Node.Tag.ToString(), tagFont, _
            Brushes.Yellow, e.Bounds.Right + 2, e.Bounds.Top)
    End If

    ' If the node has focus, draw the focus rectangle large, making
    ' it large enough to include the text of the node tag, if present.
    If (e.State And TreeNodeStates.Focused) <> 0 Then
        Dim focusPen As New Pen(Color.Black)
        Try
            focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot
            Dim focusBounds As Rectangle = NodeBounds(e.Node)
            focusBounds.Size = New Size(focusBounds.Width - 1, _
                focusBounds.Height - 1)
            e.Graphics.DrawRectangle(focusPen, focusBounds)
        Finally
            focusPen.Dispose()
        End Try
    End If

End Sub

Keterangan

Enumerasi ini digunakan oleh State properti kelas DrawTreeNodeEventArgs . Untuk informasi selengkapnya, lihat TreeView.DrawNode peristiwa.

Lihat juga

• DrawTreeNodeEventArgs
• State
• DrawNode