TreeView.DrawMode Özellik

Tanım

Ad Alanı:

System.Windows.Forms

Bütünleştirilmiş Kod:

System.Windows.Forms.dll

Denetimin çizildiği modu alır veya ayarlar.

public:
 property System::Windows::Forms::TreeViewDrawMode DrawMode { System::Windows::Forms::TreeViewDrawMode get(); void set(System::Windows::Forms::TreeViewDrawMode value); };

public System.Windows.Forms.TreeViewDrawMode DrawMode { get; set; }

member this.DrawMode : System.Windows.Forms.TreeViewDrawMode with get, set

Public Property DrawMode As TreeViewDrawMode

Özellik Değeri

TreeViewDrawMode

Değerlerden TreeViewDrawMode biri. Varsayılan değer: Normal.

Özel durumlar

InvalidEnumArgumentException

Özellik değeri geçerli TreeViewDrawMode bir değer değil.

Örnekler

Aşağıdaki kod örneği, sahip çizimini kullanarak denetimi TreeView özelleştirmeyi gösterir. Örnekteki TreeView denetim, standart düğüm etiketleriyle birlikte isteğe bağlı düğüm etiketlerini görüntüler. Düğüm etiketleri özelliği kullanılarak TreeNode.Tag belirtilir. Denetim TreeView ayrıca özel bir vurgu rengi içeren özel renkler de kullanır.

Renk özelliklerini ayarlayarak renklerin TreeView çoğunu özelleştirebilirsiniz, ancak seçim vurgu rengi özellik olarak kullanılamaz. Ayrıca, varsayılan seçim dikdörtgeni vurgulamak yalnızca bir düğüm etiketi çevresinde genişletir. Sahip çizimi, düğüm etiketlerini çizmek ve düğüm etiketi içerecek kadar büyük özelleştirilmiş bir vurgu dikdörtgeni çizmek için kullanılmalıdır.

Tam örnek için başvuru konusuna DrawNode bakın.

TreeViewOwnerDraw()
{
   tagFont = gcnew System::Drawing::Font( "Helvetica",8,FontStyle::Bold );

   // Create and initialize the TreeView control.
   myTreeView = gcnew TreeView;
   myTreeView->Dock = DockStyle::Fill;
   myTreeView->BackColor = Color::Tan;
   myTreeView->CheckBoxes = true;
   
   // Add nodes to the TreeView control.
   TreeNode^ node;
   for ( int x = 1; x < 4; ++x )
   {
      // Add a root node to the TreeView control.
      node = myTreeView->Nodes->Add( String::Format( "Task {0}", x ) );
      for ( int y = 1; y < 4; ++y )
      {
         // Add a child node to the root node.
         node->Nodes->Add( String::Format( "Subtask {0}", y ) );
      }
   }
   myTreeView->ExpandAll();
   
   // Add tags containing alert messages to a few nodes 
   // and set the node background color to highlight them.
   myTreeView->Nodes[ 1 ]->Nodes[ 0 ]->Tag = "urgent!";
   myTreeView->Nodes[ 1 ]->Nodes[ 0 ]->BackColor = Color::Yellow;
   myTreeView->SelectedNode = myTreeView->Nodes[ 1 ]->Nodes[ 0 ];
   myTreeView->Nodes[ 2 ]->Nodes[ 1 ]->Tag = "urgent!";
   myTreeView->Nodes[ 2 ]->Nodes[ 1 ]->BackColor = Color::Yellow;
   
   // Configure the TreeView control for owner-draw and add
   // a handler for the DrawNode event.
   myTreeView->DrawMode = TreeViewDrawMode::OwnerDrawText;
   myTreeView->DrawNode += gcnew DrawTreeNodeEventHandler( this, &TreeViewOwnerDraw::myTreeView_DrawNode );
   
   // Add a handler for the MouseDown event so that a node can be 
   // selected by clicking the tag text as well as the node text.
   myTreeView->MouseDown += gcnew MouseEventHandler( this, &TreeViewOwnerDraw::myTreeView_MouseDown );
   
   // Initialize the form and add the TreeView control to it.
   this->ClientSize = System::Drawing::Size( 292, 273 );
   this->Controls->Add( myTreeView );
}

public TreeViewOwnerDraw()
{
    // Create and initialize the TreeView control.
    myTreeView = new TreeView();
    myTreeView.Dock = DockStyle.Fill;
    myTreeView.BackColor = Color.Tan;
    myTreeView.CheckBoxes = true;

    // Add nodes to the TreeView control.
    TreeNode node;
    for (int x = 1; x < 4; ++x)
    {
        // Add a root node to the TreeView control.
        node = myTreeView.Nodes.Add(String.Format("Task {0}", x));
        for (int y = 1; y < 4; ++y)
        {
            // Add a child node to the root node.
            node.Nodes.Add(String.Format("Subtask {0}", y));
        }
    }
    myTreeView.ExpandAll();

    // Add tags containing alert messages to a few nodes 
    // and set the node background color to highlight them.
    myTreeView.Nodes[1].Nodes[0].Tag = "urgent!";
    myTreeView.Nodes[1].Nodes[0].BackColor = Color.Yellow;
    myTreeView.SelectedNode = myTreeView.Nodes[1].Nodes[0];
    myTreeView.Nodes[2].Nodes[1].Tag = "urgent!";
    myTreeView.Nodes[2].Nodes[1].BackColor = Color.Yellow;

    // Configure the TreeView control for owner-draw and add
    // a handler for the DrawNode event.
    myTreeView.DrawMode = TreeViewDrawMode.OwnerDrawText;
    myTreeView.DrawNode += 
        new DrawTreeNodeEventHandler(myTreeView_DrawNode);

    // Add a handler for the MouseDown event so that a node can be 
    // selected by clicking the tag text as well as the node text.
    myTreeView.MouseDown += new MouseEventHandler(myTreeView_MouseDown);

    // Initialize the form and add the TreeView control to it.
    this.ClientSize = new Size(292, 273);
    this.Controls.Add(myTreeView);
}

Public Sub New()

    ' Create and initialize the TreeView control.
    myTreeView = New TreeView()
    myTreeView.Dock = DockStyle.Fill
    myTreeView.BackColor = Color.Tan
    myTreeView.CheckBoxes = True
    
    ' Add nodes to the TreeView control.
    Dim node As TreeNode
    Dim x As Integer
    For x = 1 To 3

        ' Add a root node to the TreeView control.
        node = myTreeView.Nodes.Add(String.Format("Task {0}", x))
        Dim y As Integer
        For y = 1 To 3 

            ' Add a child node to the root node.
            node.Nodes.Add(String.Format("Subtask {0}", y))
        Next y
    Next x
    myTreeView.ExpandAll()
    
    ' Add tags containing alert messages to a few nodes 
    ' and set the node background color to highlight them.
    myTreeView.Nodes(1).Nodes(0).Tag = "urgent!"
    myTreeView.Nodes(1).Nodes(0).BackColor = Color.Yellow
    myTreeView.SelectedNode = myTreeView.Nodes(1).Nodes(0)
    myTreeView.Nodes(2).Nodes(1).Tag = "urgent!"
    myTreeView.Nodes(2).Nodes(1).BackColor = Color.Yellow
    
    ' Configure the TreeView control for owner-draw.
    myTreeView.DrawMode = TreeViewDrawMode.OwnerDrawText

    ' Add a handler for the MouseDown event so that a node can be 
    ' selected by clicking the tag text as well as the node text.
    AddHandler myTreeView.MouseDown, AddressOf myTreeView_MouseDown
    
    ' Initialize the form and add the TreeView control to it.
    Me.ClientSize = New Size(292, 273)
    Me.Controls.Add(myTreeView)
End Sub

Açıklamalar

düğümleri TreeView genellikle işletim sistemi tarafından çizilir. özelliği, DrawMode düğümlerin görünümünü özelleştirmenize olanak tanır. Bunu yapmak için veya TreeViewDrawMode.OwnerDrawText olarak TreeViewDrawMode.OwnerDrawAll ayarlayın DrawMode ve olay için DrawNode bir işleyici sağlayın. Buna sahip çizimi denir.

Ayrıca bkz.

• TreeViewDrawMode
• DrawNode