Cursor Classe

Definizione

public ref class Cursor sealed : IDisposable, System::Runtime::Serialization::ISerializable

[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.CursorConverter))]
[System.Serializable]
public sealed class Cursor : IDisposable, System.Runtime.Serialization.ISerializable

type Cursor = class
    interface IDisposable
    interface ISerializable

Public NotInheritable Class Cursor
Implements IDisposable, ISerializable

Ereditarietà

Object

Cursor

Attributi

TypeConverterAttribute SerializableAttribute

Implementazioni

IDisposable ISerializable

Esempi

Nell'esempio di codice seguente viene visualizzato un form che illustra l'utilizzo di un cursore personalizzato.The following code example displays a form that demonstrates using a custom cursor. La personalizzata Cursor è incorporata nel file di risorse dell'applicazione.The custom Cursor is embedded in the application's resource file. Nell'esempio è necessario un cursore contenuto in un file di MyCursor.curcursore denominato.The example requires a cursor contained in a cursor file named MyCursor.cur. Per compilare questo esempio utilizzando la riga di comando, includere il flag seguente:/res:MyCursor.Cur, CustomCursor.MyCursor.CurTo compile this example using the command line, include the following flag: /res:MyCursor.Cur, CustomCursor.MyCursor.Cur

using System;
using System.Drawing;
using System.Windows.Forms;

namespace CustomCursor
{
    public class Form1 : System.Windows.Forms.Form
    {
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        public Form1()
        {
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Text = "Cursor Example";
            
            // The following generates a cursor from an embedded resource.
            
            // To add a custom cursor, create a bitmap
            //        1. Add a new cursor file to your project: 
            //                Project->Add New Item->General->Cursor File

            // --- To make the custom cursor an embedded resource  ---
            
            // In Visual Studio:
            //        1. Select the cursor file in the Solution Explorer
            //        2. Choose View->Properties.
            //        3. In the properties window switch "Build Action" to "Embedded Resources"

            // On the command line:
            //        Add the following flag:
            //            /res:CursorFileName.cur,Namespace.CursorFileName.cur
            //        
            //        Where "Namespace" is the namespace in which you want to use the cursor
            //        and   "CursorFileName.cur" is the cursor filename.

            // The following line uses the namespace from the passed-in type
            // and looks for CustomCursor.MyCursor.Cur in the assemblies manifest.
        // NOTE: The cursor name is acase sensitive.
            this.Cursor = new Cursor(GetType(), "MyCursor.cur");  
           
        }
    }
}

Imports System.Drawing
Imports System.Windows.Forms

Namespace CustomCursor
   
   Public Class Form1
      Inherits System.Windows.Forms.Form
      
      <System.STAThread()> _
      Public Shared Sub Main()
         System.Windows.Forms.Application.Run(New Form1())
      End Sub

      Public Sub New()

         Me.ClientSize = New System.Drawing.Size(292, 266)
         Me.Text = "Cursor Example"
         
        ' The following generates a cursor from an embedded resource.
         
        'To add a custom cursor, create a bitmap
        '       1. Add a new cursor file to your project: 
        '               Project->Add New Item->General->Cursor File

        '--- To make the custom cursor an embedded resource  ---

        'In Visual Studio:
        '       1. Select the cursor file in the Solution Explorer
        '       2. Choose View->Properties.
        '       3. In the properties window switch "Build Action" to "Embedded Resources"

        'On the command line:
        '       Add the following flag:
        '           /res:CursorFileName.cur,Namespace.CursorFileName.cur

        '       Where "Namespace" is the namespace in which you want to use the cursor
        '       and   "CursorFileName.cur" is the cursor filename.

        'The following line uses the namespace from the passed-in type
        'and looks for CustomCursor.MyCursor.cur in the assemblies manifest.
        'NOTE: The cursor name is acase sensitive.
        Me.Cursor = New Cursor(Me.GetType(), "MyCursor.cur")
      End Sub
   End Class
End Namespace 'CustomCursor

Nell'esempio di codice seguente vengono visualizzate le informazioni TreeView sui clienti in un controllo.The following code example displays customer information in a TreeView control. I nodi della struttura ad albero radice visualizzano i nomi dei clienti e i nodi figlio dell'albero visualizzano i numeri di ordine assegnati a ogni cliente.The root tree nodes display customer names, and the child tree nodes display the order numbers assigned to each customer. In questo esempio, 1.000 clienti vengono visualizzati con 15 ordini ciascuno.In this example, 1,000 customers are displayed with 15 orders each. Il ridisegno TreeView di viene eliminato usando i BeginUpdate metodi e EndUpdate e viene visualizzata un'attesa Cursor mentre TreeView crea e disegna gli TreeNode oggetti.The repainting of the TreeView is suppressed by using the BeginUpdate and EndUpdate methods, and a wait Cursor is displayed while the TreeView creates and paints the TreeNode objects. Per questo esempio è necessario disporre di un file di MyWait.cur cursore denominato nella directory dell'applicazione.This example requires that you have a cursor file named MyWait.cur in the application directory. Richiede anche un Customer oggetto che può contenere una raccolta di Order oggetti e che è stata creata un'istanza di un TreeView controllo in un Formoggetto.It also requires a Customer object that can hold a collection of Order objects, and that you have created an instance of a TreeView control on a Form.

// The basic Customer class.
ref class Customer: public System::Object
{
private:
   String^ custName;

protected:
   ArrayList^ custOrders;

public:
   Customer( String^ customername )
   {
      custName = "";
      custOrders = gcnew ArrayList;
      this->custName = customername;
   }


   property String^ CustomerName 
   {
      String^ get()
      {
         return this->custName;
      }

      void set( String^ value )
      {
         this->custName = value;
      }

   }

   property ArrayList^ CustomerOrders 
   {
      ArrayList^ get()
      {
         return this->custOrders;
      }

   }

};


// End Customer class
// The basic customer Order class.
ref class Order: public System::Object
{
private:
   String^ ordID;

public:
   Order( String^ orderid )
   {
      ordID = "";
      this->ordID = orderid;
   }


   property String^ OrderID 
   {
      String^ get()
      {
         return this->ordID;
      }

      void set( String^ value )
      {
         this->ordID = value;
      }

   }

};
// End Order class



void FillMyTreeView()
{
   // Add customers to the ArrayList of Customer objects.
   for ( int x = 0; x < 1000; x++ )
   {
      customerArray->Add( gcnew Customer( "Customer " + x ) );
   }
   
   // Add orders to each Customer object in the ArrayList.
   IEnumerator^ myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ customer1 = safe_cast<Customer^>(myEnum->Current);
      for ( int y = 0; y < 15; y++ )
      {
         customer1->CustomerOrders->Add( gcnew Order( "Order " + y ) );
      }
   }

   // Display a wait cursor while the TreeNodes are being created.
   ::Cursor::Current = gcnew System::Windows::Forms::Cursor( "MyWait.cur" );
   
   // Suppress repainting the TreeView until all the objects have been created.
   treeView1->BeginUpdate();
   
   // Clear the TreeView each time the method is called.
   treeView1->Nodes->Clear();
   
   // Add a root TreeNode for each Customer object in the ArrayList.
   myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ customer2 = safe_cast<Customer^>(myEnum->Current);
      treeView1->Nodes->Add( gcnew TreeNode( customer2->CustomerName ) );
      
      // Add a child treenode for each Order object in the current Customer object.
      IEnumerator^ myEnum = customer2->CustomerOrders->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         Order^ order1 = safe_cast<Order^>(myEnum->Current);
         treeView1->Nodes[ customerArray->IndexOf( customer2 ) ]->Nodes->Add( gcnew TreeNode( customer2->CustomerName + "." + order1->OrderID ) );
      }
   }
   
   // Reset the cursor to the default for all controls.
   ::Cursor::Current = Cursors::Default;
   
   // Begin repainting the TreeView.
   treeView1->EndUpdate();
}

// The basic Customer class.
public class Customer : System.Object
{
   private string custName = "";
   protected ArrayList custOrders = new ArrayList();

   public Customer(string customername)
   {
      this.custName = customername;
   }

   public string CustomerName
   {      
      get{return this.custName;}
      set{this.custName = value;}
   }

   public ArrayList CustomerOrders 
   {
      get{return this.custOrders;}
   }

} // End Customer class 


// The basic customer Order class.
public class Order : System.Object
{
   private string ordID = "";

   public Order(string orderid)
   {
      this.ordID = orderid;
   }

   public string OrderID
   {      
      get{return this.ordID;}
      set{this.ordID = value;}
   }

} // End Order class

// Create a new ArrayList to hold the Customer objects.
private ArrayList customerArray = new ArrayList(); 

private void FillMyTreeView()
{
   // Add customers to the ArrayList of Customer objects.
   for(int x=0; x<1000; x++)
   {
      customerArray.Add(new Customer("Customer" + x.ToString()));
   }

   // Add orders to each Customer object in the ArrayList.
   foreach(Customer customer1 in customerArray)
   {
      for(int y=0; y<15; y++)
      {
         customer1.CustomerOrders.Add(new Order("Order" + y.ToString()));    
      }
   }

   // Display a wait cursor while the TreeNodes are being created.
   Cursor.Current = new Cursor("MyWait.cur");
        
   // Suppress repainting the TreeView until all the objects have been created.
   treeView1.BeginUpdate();

   // Clear the TreeView each time the method is called.
   treeView1.Nodes.Clear();

   // Add a root TreeNode for each Customer object in the ArrayList.
   foreach(Customer customer2 in customerArray)
   {
      treeView1.Nodes.Add(new TreeNode(customer2.CustomerName));
          
      // Add a child treenode for each Order object in the current Customer object.
      foreach(Order order1 in customer2.CustomerOrders)
      {
         treeView1.Nodes[customerArray.IndexOf(customer2)].Nodes.Add(
           new TreeNode(customer2.CustomerName + "." + order1.OrderID));
      }
   }

   // Reset the cursor to the default for all controls.
   Cursor.Current = Cursors.Default;

   // Begin repainting the TreeView.
   treeView1.EndUpdate();
}

Public Class Customer
   Inherits [Object]
   Private custName As String = ""
   Friend custOrders As New ArrayList()

   Public Sub New(ByVal customername As String)
      Me.custName = customername
   End Sub

   Public Property CustomerName() As String
      Get
         Return Me.custName
      End Get
      Set(ByVal Value As String)
         Me.custName = Value
      End Set
   End Property

   Public ReadOnly Property CustomerOrders() As ArrayList
      Get
         Return Me.custOrders
      End Get
   End Property
End Class


Public Class Order
   Inherits [Object]
   Private ordID As String

   Public Sub New(ByVal orderid As String)
      Me.ordID = orderid
   End Sub

   Public Property OrderID() As String
      Get
         Return Me.ordID
      End Get
      Set(ByVal Value As String)
         Me.ordID = Value
      End Set
   End Property
End Class

' Create a new ArrayList to hold the Customer objects.
Private customerArray As New ArrayList()

Private Sub FillMyTreeView()
   ' Add customers to the ArrayList of Customer objects.
   Dim x As Integer
   For x = 0 To 999
      customerArray.Add(New Customer("Customer" + x.ToString()))
   Next x

   ' Add orders to each Customer object in the ArrayList.
   Dim customer1 As Customer
   For Each customer1 In customerArray
      Dim y As Integer
      For y = 0 To 14
         customer1.CustomerOrders.Add(New Order("Order" + y.ToString()))
      Next y
   Next customer1

   ' Display a wait cursor while the TreeNodes are being created.
   Cursor.Current = New Cursor("MyWait.cur")

   ' Suppress repainting the TreeView until all the objects have been created.
   treeView1.BeginUpdate()

   ' Clear the TreeView each time the method is called.
   treeView1.Nodes.Clear()

   ' Add a root TreeNode for each Customer object in the ArrayList.
   Dim customer2 As Customer
   For Each customer2 In customerArray
      treeView1.Nodes.Add(New TreeNode(customer2.CustomerName))

      ' Add a child TreeNode for each Order object in the current Customer object.
      Dim order1 As Order
      For Each order1 In customer2.CustomerOrders
         treeView1.Nodes(customerArray.IndexOf(customer2)).Nodes.Add( _
    New TreeNode(customer2.CustomerName + "." + order1.OrderID))
      Next order1
   Next customer2

   ' Reset the cursor to the default for all controls.
   Cursor.Current = System.Windows.Forms.Cursors.Default

   ' Begin repainting the TreeView.
   treeView1.EndUpdate()
End Sub

Commenti

Un cursore è una piccola immagine il cui percorso sullo schermo è controllato da un dispositivo di puntamento, ad esempio un mouse, una penna o una trackball.A cursor is a small picture whose location on the screen is controlled by a pointing device, such as a mouse, pen, or trackball. Quando l'utente sposta il dispositivo di puntamento, il sistema operativo sposta di conseguenza il cursore.When the user moves the pointing device, the operating system moves the cursor accordingly.

Diverse forme di cursore vengono usate per informare l'utente dell'operazione che avrà il mouse.Different cursor shapes are used to inform the user what operation the mouse will have. Ad esempio, quando si modifica o si seleziona testo Cursors.IBeam , viene in genere visualizzato un cursore.For example, when editing or selecting text, a Cursors.IBeam cursor is typically displayed. Un cursore di attesa viene comunemente usato per informare l'utente che un processo è attualmente in esecuzione.A wait cursor is commonly used to inform the user that a process is currently running. Esempi di processi che l'utente può attendere per l'apertura di un file, il salvataggio di un file o la compilazione di un controllo DataGrid, ListBox ad TreeView esempio, o con una grande quantità di dati.Examples of processes you might have the user wait for are opening a file, saving a file, or filling a control such as a DataGrid, ListBox or TreeView with a large amount of data.

Tutti i controlli che derivano Control dalla classe hanno Cursor una proprietà.All controls that derive from the Control class have a Cursor property. Per modificare il cursore visualizzato dal puntatore del mouse quando si trova all'interno dei limiti del controllo, assegnare un oggetto Cursor Cursor alla proprietà del controllo.To change the cursor displayed by the mouse pointer when it is within the bounds of the control, assign a Cursor to the Cursor property of the control. In alternativa, è possibile visualizzare i cursori a livello di applicazione assegnando un Cursor oggetto Current alla proprietà.Alternatively, you can display cursors at the application level by assigning a Cursor to the Current property. Ad esempio, se lo scopo dell'applicazione è modificare un file di testo, è possibile impostare la Current proprietà su Cursors.WaitCursor per visualizzare un cursore di attesa sull'applicazione mentre il file viene caricato o salvato per impedire l'elaborazione di eventi del mouse.For example, if the purpose of your application is to edit a text file, you might set the Current property to Cursors.WaitCursor to display a wait cursor over the application while the file loads or saves to prevent any mouse events from being processed. Al termine del processo, impostare la Current proprietà su Cursors.Default affinché l'applicazione visualizzi il cursore appropriato per ogni tipo di controllo.When the process is complete, set the Current property to Cursors.Default for the application to display the appropriate cursor over each control type.

È possibile creare oggetti Cursor da diverse origini, ad esempio l'handle di un file Cursoresistente, un Cursor file standard, una risorsa o un flusso di dati.Cursor objects can be created from several sources, such as the handle of an existing Cursor, a standard Cursor file, a resource, or a data stream.

Se l'immagine utilizzata come cursore è troppo piccola, è possibile utilizzare il DrawStretched metodo per forzare l'immagine a riempire i limiti del cursore.If the image you are using as a cursor is too small, you can use the DrawStretched method to force the image to fill the bounds of the cursor. È possibile nascondere temporaneamente il cursore chiamando il Hide metodo e ripristinarlo chiamando il Show metodo.You can temporarily hide the cursor by calling the Hide method, and restore it by calling the Show method.

A partire da .NET Framework 4.5.2, il Cursor verrà ridimensionato in base all'impostazione DPI del sistema quando il file app. config contiene la voce seguente:Starting with the .NET Framework 4.5.2, the Cursor will be resized based on the system DPI setting when the app.config file contains the following entry:

<appSettings>  
  <add key="EnableWindowsFormsHighDpiAutoResizing" value="true" />  
</appSettings>  

Costruttori

Proprietà

Metodi

Operatori

Implementazioni dell'interfaccia esplicita

Si applica a

Vedi anche

• Cursors