TreeView.ImageList Propriedade
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
public:
property System::Windows::Forms::ImageList ^ ImageList { System::Windows::Forms::ImageList ^ get(); void set(System::Windows::Forms::ImageList ^ value); };
public System.Windows.Forms.ImageList ImageList { get; set; }
member this.ImageList : System.Windows.Forms.ImageList with get, set
Public Property ImageList As ImageList
O ImageList que contém os objetos Image usados pelos nós de árvore. O valor padrão é null
.
O exemplo de código a seguir cria e atribui um ImageList a um TreeView controle e preenche o TreeView controle com TreeNode objetos. Os nós de árvore são atribuídos imagens do ImageList que são exibidos quando em um estado selecionado ou não selecionado. Este exemplo exige que você tenha um Form que contenha um TreeViewe um ArrayList que contém Customer
objetos que contêm Order
objetos.
ref class Customer
{
public:
ArrayList^ CustomerOrders;
String^ CustomerName;
Customer( String^ myName )
{
CustomerName = myName;
CustomerOrders = gcnew ArrayList;
}
};
ref class Order
{
public:
String^ OrderID;
Order( String^ myOrderID )
{
this->OrderID = myOrderID;
}
};
void FillTreeView()
{
// Load the images in an ImageList.
ImageList^ myImageList = gcnew ImageList;
myImageList->Images->Add( Image::FromFile( "Default.gif" ) );
myImageList->Images->Add( Image::FromFile( "SelectedDefault.gif" ) );
myImageList->Images->Add( Image::FromFile( "Root.gif" ) );
myImageList->Images->Add( Image::FromFile( "UnselectedCustomer.gif" ) );
myImageList->Images->Add( Image::FromFile( "SelectedCustomer.gif" ) );
myImageList->Images->Add( Image::FromFile( "UnselectedOrder.gif" ) );
myImageList->Images->Add( Image::FromFile( "SelectedOrder.gif" ) );
// Assign the ImageList to the TreeView.
myTreeView->ImageList = myImageList;
// Set the TreeView control's default image and selected image indexes.
myTreeView->ImageIndex = 0;
myTreeView->SelectedImageIndex = 1;
/* Set the index of image from the
ImageList for selected and unselected tree nodes.*/
this->rootImageIndex = 2;
this->selectedCustomerImageIndex = 3;
this->unselectedCustomerImageIndex = 4;
this->selectedOrderImageIndex = 5;
this->unselectedOrderImageIndex = 6;
// Create the root tree node.
TreeNode^ rootNode = gcnew TreeNode( "CustomerList" );
rootNode->ImageIndex = rootImageIndex;
rootNode->SelectedImageIndex = rootImageIndex;
// Add a main root tree node.
myTreeView->Nodes->Add( rootNode );
// Add a root tree node for each Customer object in the ArrayList.
IEnumerator^ myEnum = customerArray->GetEnumerator();
while ( myEnum->MoveNext() )
{
Customer^ myCustomer = safe_cast<Customer^>(myEnum->Current);
// Add a child tree node for each Order object.
int countIndex = 0;
array<TreeNode^>^myTreeNodeArray = gcnew array<TreeNode^>(myCustomer->CustomerOrders->Count);
IEnumerator^ myEnum = myCustomer->CustomerOrders->GetEnumerator();
while ( myEnum->MoveNext() )
{
Order^ myOrder = safe_cast<Order^>(myEnum->Current);
// Add the Order tree node to the array.
myTreeNodeArray[ countIndex ] = gcnew TreeNode( myOrder->OrderID,unselectedOrderImageIndex,selectedOrderImageIndex );
countIndex++;
}
TreeNode^ customerNode = gcnew TreeNode( myCustomer->CustomerName,unselectedCustomerImageIndex,selectedCustomerImageIndex,myTreeNodeArray );
myTreeView->Nodes[ 0 ]->Nodes->Add( customerNode );
}
}
public class Customer
{
public ArrayList CustomerOrders;
public string CustomerName;
public Customer(string myName)
{
CustomerName = myName;
CustomerOrders = new ArrayList();
}
}
public class Order
{
public string OrderID;
public Order(string myOrderID )
{
this.OrderID = myOrderID;
}
}
private void FillTreeView()
{
// Load the images in an ImageList.
ImageList myImageList = new ImageList();
myImageList.Images.Add(Image.FromFile("Default.gif"));
myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"));
myImageList.Images.Add(Image.FromFile("Root.gif"));
myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"));
myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"));
myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"));
myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"));
// Assign the ImageList to the TreeView.
myTreeView.ImageList = myImageList;
// Set the TreeView control's default image and selected image indexes.
myTreeView.ImageIndex = 0;
myTreeView.SelectedImageIndex = 1;
/* Set the index of image from the
ImageList for selected and unselected tree nodes.*/
this.rootImageIndex = 2;
this.selectedCustomerImageIndex = 3;
this.unselectedCustomerImageIndex = 4;
this.selectedOrderImageIndex = 5;
this.unselectedOrderImageIndex = 6;
// Create the root tree node.
TreeNode rootNode = new TreeNode("CustomerList");
rootNode.ImageIndex = rootImageIndex;
rootNode.SelectedImageIndex = rootImageIndex;
// Add a main root tree node.
myTreeView.Nodes.Add(rootNode);
// Add a root tree node for each Customer object in the ArrayList.
foreach(Customer myCustomer in customerArray)
{
// Add a child tree node for each Order object.
int countIndex=0;
TreeNode[] myTreeNodeArray = new TreeNode[myCustomer.CustomerOrders.Count];
foreach(Order myOrder in myCustomer.CustomerOrders)
{
// Add the Order tree node to the array.
myTreeNodeArray[countIndex] = new TreeNode(myOrder.OrderID,
unselectedOrderImageIndex, selectedOrderImageIndex);
countIndex++;
}
// Add the Customer tree node.
TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray);
myTreeView.Nodes[0].Nodes.Add(customerNode);
}
}
Public Class Customer
Public CustomerOrders As ArrayList
Public CustomerName As String
Public Sub New(myName As String)
CustomerName = myName
CustomerOrders = New ArrayList()
End Sub
End Class
Public Class Order
Public OrderID As String
Public Sub New(myOrderID As String)
Me.OrderID = myOrderID
End Sub
End Class
Private Sub FillTreeView()
' Load the images in an ImageList.
Dim myImageList As New ImageList()
myImageList.Images.Add(Image.FromFile("Default.gif"))
myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"))
myImageList.Images.Add(Image.FromFile("Root.gif"))
myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"))
myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"))
myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"))
myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"))
' Assign the ImageList to the TreeView.
myTreeView.ImageList = myImageList
' Set the TreeView control's default image and selected image indexes.
myTreeView.ImageIndex = 0
myTreeView.SelectedImageIndex = 1
' Set the index of image from the
' ImageList for selected and unselected tree nodes.
Me.rootImageIndex = 2
Me.selectedCustomerImageIndex = 3
Me.unselectedCustomerImageIndex = 4
Me.selectedOrderImageIndex = 5
Me.unselectedOrderImageIndex = 6
' Create the root tree node.
Dim rootNode As New TreeNode("CustomerList")
rootNode.ImageIndex = rootImageIndex
rootNode.SelectedImageIndex = rootImageIndex
' Add a main root tree node.
myTreeView.Nodes.Add(rootNode)
' Add a root tree node for each Customer object in the ArrayList.
Dim myCustomer As Customer
For Each myCustomer In customerArray
' Add a child tree node for each Order object.
Dim countIndex As Integer = 0
Dim myTreeNodeArray(myCustomer.CustomerOrders.Count) As TreeNode
Dim myOrder As Order
For Each myOrder In myCustomer.CustomerOrders
' Add the Order tree node to the array.
myTreeNodeArray(countIndex) = New TreeNode(myOrder.OrderID, _
unselectedOrderImageIndex, selectedOrderImageIndex)
countIndex += 1
Next myOrder
' Add the Customer tree node.
Dim customerNode As New TreeNode(myCustomer.CustomerName, _
unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray)
myTreeView.Nodes(0).Nodes.Add(customerNode)
Next myCustomer
End Sub
Se o valor da ImageList propriedade for algo diferente null
, todos os nós de árvore exibirão o primeiro Image armazenado no ImageList. Você pode especificar quais imagens da lista são exibidas para nós selecionados e não selecionados definindo as propriedades e SelectedImageIndex as ImageIndex propriedades. Objetos individuais TreeNode podem especificar qual imagem é exibida definindo suas propriedades e SelectedImageIndex propriedadesImageIndex. Essas configurações individuais substituirão as configurações nas propriedades correspondentes TreeView .
Observação
No .NET Framework versão 1.1, há um problema que impede que imagens apareçam em TreeView nós quando o aplicativo chama Application.EnableVisualStyles. Para contornar esse problema, chame Application.DoEvents seu Main
método imediatamente depois de chamar EnableVisualStyles. Esse problema é corrigido no .NET Framework 2.0.