TreeViewDrawMode Enumeración

Definición

public enum class TreeViewDrawMode

public enum TreeViewDrawMode

type TreeViewDrawMode = 

Public Enum TreeViewDrawMode

Herencia

Object

ValueType

Enum

TreeViewDrawMode

Campos

Ejemplos

En el ejemplo de código siguiente se muestra cómo personalizar un TreeView control mediante su funcionalidad de dibujo de propietario. El TreeView control del ejemplo muestra etiquetas de nodo opcionales junto con las etiquetas de nodo estándar. Las etiquetas de nodo se especifican mediante la TreeNode.Tag propiedad . El TreeView control también usa colores personalizados, incluido un color de resaltado personalizado.

Puede personalizar la mayoría de los TreeView colores estableciendo propiedades de color, pero el color de resaltado de selección no está disponible como una propiedad. Además, el rectángulo de resaltado de selección predeterminado solo se extiende alrededor de una etiqueta de nodo. El dibujo del propietario debe usarse para dibujar las etiquetas de nodo y para dibujar un rectángulo de resaltado personalizado lo suficientemente grande como para incluir una etiqueta de nodo.

Para obtener el ejemplo completo, consulte el tema de TreeView.DrawNode referencia.

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

Comentarios

Esta enumeración la usa la TreeView.DrawMode propiedad para indicar si los nodos o las etiquetas de nodo de un TreeView objeto son dibujados por el propietario. Para obtener más información, vea el evento TreeView.DrawNode.

Se aplica a

Consulte también

• TreeView
• DrawMode
• DrawNode