TreeView.Scrollable Propriedade

Definição

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Obtém ou define um valor que indica se o controle de exibição de árvore exibirá as barras de rolagem quando elas forem necessárias.

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

public bool Scrollable { get; set; }

member this.Scrollable : bool with get, set

Public Property Scrollable As Boolean

Valor da propriedade

Boolean

true se o controle de exibição de árvore exibirá barras de rolagem quando elas forem necessárias; caso contrário, false. O padrão é true.

Exemplos

O exemplo de código a seguir demonstra como usar a BorderStyle enumeração e as BorderStyleShowLinespropriedades e , e ShowRootLines ScrollableHideSelection. Para executar este exemplo, cole o código a seguir em um formulário e chame o InitializeTreeView método no construtor ou Load método do formulário.

   // Declare the TreeView control.
internal:
   System::Windows::Forms::TreeView^ TreeView1;

private:
   // Initialize the TreeView to blend with the form, giving it the 
   // same color as the form and no border.
   void InitializeTreeView()
   {
      // Create a new TreeView control and set the location and size.
      this->TreeView1 = gcnew System::Windows::Forms::TreeView;
      this->TreeView1->Location = System::Drawing::Point( 72, 48 );
      this->TreeView1->Size = System::Drawing::Size( 200, 200 );

      // Set the BorderStyle property to none, the BackColor property to  
      // the form's backcolor, and the Scrollable property to false.  
      // This allows the TreeView to blend in form.
      this->TreeView1->BorderStyle = BorderStyle::None;
      this->TreeView1->BackColor = this->BackColor;
      this->TreeView1->Scrollable = false;

      // Set the HideSelection property to false to keep the 
      // selection highlighted when the user leaves the control. 
      // This helps it blend with form.
      this->TreeView1->HideSelection = false;

      // Set the ShowRootLines and ShowLines properties to false to 
      // give the TreeView a list-like appearance.
      this->TreeView1->ShowRootLines = false;
      this->TreeView1->ShowLines = false;

      // Add the nodes.
      array<TreeNode^>^temp0 = {gcnew TreeNode( "Full Color" ),gcnew TreeNode( "Project Wizards" ),gcnew TreeNode( "Visual C# and Visual Basic Support" )};
      array<TreeNode^>^temp1 = {gcnew TreeNode( "Pentium 133 MHz or faster processor " ),gcnew TreeNode( "Windows 98 or later" ),gcnew TreeNode( "100 MB Disk space" )};
      array<TreeNode^>^temp2 = {gcnew TreeNode( "Features",temp0 ),gcnew TreeNode( "System Requirements",temp1 )};
      this->TreeView1->Nodes->AddRange( temp2 );

      // Set the tab index and add the TreeView to the form.
      this->TreeView1->TabIndex = 0;
      this->Controls->Add( this->TreeView1 );
   }

// Declare the TreeView control.
internal System.Windows.Forms.TreeView TreeView1;

// Initialize the TreeView to blend with the form, giving it the 
// same color as the form and no border.
private void InitializeTreeView()
{

    // Create a new TreeView control and set the location and size.
    this.TreeView1 = new System.Windows.Forms.TreeView();
    this.TreeView1.Location = new System.Drawing.Point(72, 48);
    this.TreeView1.Size = new System.Drawing.Size(200, 200);

    // Set the BorderStyle property to none, the BackColor property to  
    // the form's backcolor, and the Scrollable property to false.  
    // This allows the TreeView to blend in form.

    this.TreeView1.BorderStyle = BorderStyle.None;
    this.TreeView1.BackColor = this.BackColor;
    this.TreeView1.Scrollable = false;

    // Set the HideSelection property to false to keep the 
    // selection highlighted when the user leaves the control. 
    // This helps it blend with form.
    this.TreeView1.HideSelection = false;

    // Set the ShowRootLines and ShowLines properties to false to 
    // give the TreeView a list-like appearance.
    this.TreeView1.ShowRootLines = false;
    this.TreeView1.ShowLines = false;

    // Add the nodes.
    this.TreeView1.Nodes.AddRange(new TreeNode[]
        {new TreeNode("Features", 
            new TreeNode[]{
            new TreeNode("Full Color"), 
            new TreeNode("Project Wizards"), 
            new TreeNode("Visual C# and Visual Basic Support")}), 
            new TreeNode("System Requirements", 
            new TreeNode[]{
                new TreeNode("Pentium 133 MHz or faster processor "),
                new TreeNode("Windows 98 or later"), 
                new TreeNode("100 MB Disk space")})
        });

    // Set the tab index and add the TreeView to the form.
    this.TreeView1.TabIndex = 0;
    this.Controls.Add(this.TreeView1);
}

' Declare the TreeView control.
Friend WithEvents TreeView1 As System.Windows.Forms.TreeView

' Initialize the TreeView to blend with the form, giving it the 
' same color as the form and no border.
Private Sub InitializeTreeView()

    ' Create a new TreeView control and set the location and size.
    Me.TreeView1 = New System.Windows.Forms.TreeView
    Me.TreeView1.Location = New System.Drawing.Point(72, 48)
    Me.TreeView1.Size = New System.Drawing.Size(200, 200)

    ' Set the BorderStyle property to none, the BackColor property to  
    ' the form's backcolor, and the Scrollable property to false.  
    ' This allows the TreeView to blend in form.
    Me.TreeView1.BorderStyle = BorderStyle.None
    Me.TreeView1.BackColor = Me.BackColor
    Me.TreeView1.Scrollable = False

    
    ' Set the ShowRootLines and ShowLines properties to false to 
    ' give the TreeView a list-like appearance.
    Me.TreeView1.ShowRootLines = False
    Me.TreeView1.ShowLines = False

    ' Add the nodes.
    Me.TreeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode("Features", _
        New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode("Full Color"), _
        New System.Windows.Forms.TreeNode("Project Wizards"), _
        New System.Windows.Forms.TreeNode("Visual C# and Visual Basic Support")}), _
        New System.Windows.Forms.TreeNode("System Requirements", _
        New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode _
        ("Pentium 133 MHz or faster processor "), _
        New System.Windows.Forms.TreeNode("Windows 98 or later"), _
        New System.Windows.Forms.TreeNode("100 MB Disk space")})})

    ' Set the tab index and add the TreeView to the form.
    Me.TreeView1.TabIndex = 0
    Me.Controls.Add(Me.TreeView1)
End Sub

Comentários

Se essa propriedade estiver definida como true, as TreeView barras de rolagem serão exibidas no momento em que qualquer TreeNode um está localizado fora da região do cliente do controle.

Observação

Ao definir a Scrollable propriedade em tempo de execução, o TreeView identificador é recriado (consulte Control.RecreateHandle) para atualizar a aparência do controle. Isso faz com que todos os nós de árvore sejam recolhidos, com exceção do selecionado TreeNode.