Cursor Cursor Cursor Cursor Class

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

ObjectObjectObjectObject

CursorCursorCursorCursor

Attributi

TypeConverterAttribute SerializableAttribute

Implementazioni

IDisposableIDisposableIDisposableIDisposable ISerializableISerializableISerializableISerializable

Esempi

Esempio di codice seguente visualizza un form che illustra l'uso di un cursore personalizzato.The following code example displays a form that demonstrates using a custom cursor. L'oggetto personalizzato Cursor è incorporato nel file di risorse dell'applicazione.The custom Cursor is embedded in the application's resource file. L'esempio richiede un cursore contenuto in un file cursore denominato MyCursor.cur.The example requires a cursor contained in a cursor file named MyCursor.cur. Per compilare questo esempio dalla 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
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 'Main

      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 'New       
   End Class 'Form1
End Namespace 'CustomCursor

Esempio di codice seguente consente di visualizzare informazioni sul cliente in un TreeView controllo.The following code example displays customer information in a TreeView control. I nodi dell'albero radice visualizzare i nomi dei clienti e i numeri degli ordini assegnati a ogni cliente di visualizzare i nodi dell'albero figlio.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.In this example, 1,000 customers are displayed with 15 orders each. Per evitare di ridisegnare il TreeView viene eliminata tramite il BeginUpdate e EndUpdate metodi e un periodo di attesa Cursor viene visualizzato mentre il TreeView crea e disegna il 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. Questo esempio richiede che si dispone di un file cursore denominato MyWait.cur nella directory dell'applicazione.This example requires that you have a cursor file named MyWait.cur in the application directory. È inoltre necessario un Customer oggetto che può contenere una raccolta di Order oggetti, e che hanno creato un'istanza di un TreeView control per un Form.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 'End Customer class


Public Class Order
   Inherits [Object]
   Private ordID As String

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

   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 ' End Order 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 'FillMyTreeView

Commenti

Un cursore è una piccola immagine la cui posizione sullo schermo è controllata da un dispositivo di puntamento, ad esempio un mouse, penna o 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 si sposta il cursore di conseguenza.When the user moves the pointing device, the operating system moves the cursor accordingly.

Le forme di cursore diverso vengono usate per informare l'utente l'operazione che avrà il puntatore del mouse.Different cursor shapes are used to inform the user what operation the mouse will have. Ad esempio, quando si modifica o la selezione di testo, un Cursors.IBeam cursore verrà in genere visualizzato.For example, when editing or selecting text, a Cursors.IBeam cursor is typically displayed. Cursore di attesa viene comunemente utilizzato per informare l'utente che è attualmente in esecuzione un processo.A wait cursor is commonly used to inform the user that a process is currently running. Esempi di processi che richiedono un'attesa per l'utente apre un file, salvataggio di un file o la compilazione di un controllo, ad esempio un DataGrid, ListBox o TreeView 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 dal Control classe ha un Cursor proprietà.All controls that derive from the Control class have a Cursor property. Per modificare il cursore visualizzato il puntatore del mouse quando si trova entro i limiti del controllo, assegnare un Cursor per il Cursor 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 tramite l'assegnazione di un Cursor per il Current 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 consiste nel modificare un file di testo, è possibile impostare il Current proprietà Cursors.WaitCursor per visualizzare un cursore di attesa dell'applicazione mentre il file viene caricato o salvato per impedire l'elaborazione di tutti gli 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. Una volta completato il processo, impostare il Current proprietà Cursors.Default per l'applicazione venga visualizzato il cursore appropriato su 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 di cursore da diverse origini, ad esempio l'handle di un oggetto esistente Cursor, uno standard Cursor file, 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 che si usa un cursore è troppo piccola, è possibile usare il DrawStretched metodo per forzare l'immagine per 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 tramite una chiamata di Hide metodo e il ripristino 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 ridimensionata in base l'impostazione del valore DPI di 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

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Metodi

Operatori

Implementazioni dell'interfaccia esplicita

Si applica a

Vedi anche

• Cursors