ListView.GetItemAt(Int32, Int32) Method

Definition

Recupera el elemento en la ubicación especificada.Retrieves the item at the specified location.

public:
 System::Windows::Forms::ListViewItem ^ GetItemAt(int x, int y);
public System.Windows.Forms.ListViewItem GetItemAt (int x, int y);
member this.GetItemAt : int * int -> System.Windows.Forms.ListViewItem
Public Function GetItemAt (x As Integer, y As Integer) As ListViewItem

Parameters

x
Int32

Coordenada x de la ubicación en la que se desea buscar un elemento (expresada en coordenadas de cliente).The x-coordinate of the location to search for an item (expressed in client coordinates).

y
Int32

Coordenada y de la ubicación en la que se desea buscar un elemento (expresada en coordenadas de cliente).The y-coordinate of the location to search for an item (expressed in client coordinates).

Returns

ListViewItem

ListViewItem que representa el elemento en la posición especificada.A ListViewItem that represents the item at the specified position. Si no hay ningún elemento en la posición especificada, el método devuelve null.If there is no item at the specified location, the method returns null.

Examples

En el ejemplo de código siguiente se muestra el uso de los controles PictureBox y ListView.The following code example demonstrates the use of the PictureBox and ListView controls. El PictureBox se inicializa estableciendo las propiedades PictureBox.BorderStyle y PictureBox.SizeMode mediante las enumeraciones BorderStyle y PictureBoxSizeMode, respectivamente.The PictureBox is initialized by setting the PictureBox.BorderStyle and PictureBox.SizeMode properties using the BorderStyle and PictureBoxSizeMode enumerations, respectively. El ListView se rellena con imágenes del directorio Samples.The ListView is populated with pictures from the Samples directory. El método GetItemAt se utiliza en al controlar el evento MouseDown del control ListView para determinar si un elemento está seleccionado.The GetItemAt method is used in when handling the ListView control's MouseDown event to determine whether an item is selected. Si se selecciona un elemento, el controlador de eventos muestra el archivo seleccionado estableciendo la propiedad PictureBox.Image.If an item is selected, the event handler displays the selected file by setting the PictureBox.Image property. El ejemplo requiere la existencia de archivos JPG ubicados en el directorio C:\Documents and Settings\All Users\Documents\My \ Sample Pictures Pictures.The example requires the existence of JPG files located in the C:\documents and Settings\All Users\Documents\My Pictures\Sample Pictures directory. Para ejecutar este ejemplo, pegue el código en un formulario y llame a los métodos InitializePictureBox y PopulateListView en el constructor o el método de Load del formulario.To run this example, paste the code into a form and call the InitializePictureBox and PopulateListView methods in the form's constructor or Load method. Asegúrese de que todos los eventos estén asociados a sus controladores de eventos.Ensure all events are associated with their event handlers.

private:
   void PopulateListView()
   {
      ListView1->Width = 270;
      ListView1->Location = System::Drawing::Point( 10, 10 );
      
      // Declare and construct the ColumnHeader objects.
      ColumnHeader^ header1;
      ColumnHeader^ header2;
      header1 = gcnew ColumnHeader;
      header2 = gcnew ColumnHeader;
      
      // Set the text, alignment and width for each column header.
      header1->Text = "File name";
      header1->TextAlign = HorizontalAlignment::Left;
      header1->Width = 70;
      header2->TextAlign = HorizontalAlignment::Left;
      header2->Text = "Location";
      header2->Width = 200;
      
      // Add the headers to the ListView control.
      ListView1->Columns->Add( header1 );
      ListView1->Columns->Add( header2 );
            
      // Specify that each item appears on a separate line.
      ListView1->View = View::Details;

      // Populate the ListView.Items property.
      // Set the directory to the sample picture directory.
      System::IO::DirectoryInfo^ dirInfo = gcnew System::IO::DirectoryInfo( "C:\\Documents and Settings\\All Users"
      "\\Documents\\My Pictures\\Sample Pictures" );
      
      // Get the .jpg files from the directory
      array<System::IO::FileInfo^>^files = dirInfo->GetFiles( "*.jpg" );
      
      // Add each file name and full name including path
      // to the ListView.
      if ( files != nullptr )
      {
         System::Collections::IEnumerator^ myEnum = files->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            System::IO::FileInfo^ file = safe_cast<System::IO::FileInfo^>(myEnum->Current);
            ListViewItem^ item = gcnew ListViewItem( file->Name );
            item->SubItems->Add( file->FullName );
            ListView1->Items->Add( item );
         }
      }
   }

   void InitializePictureBox()
   {
      PictureBox1 = gcnew PictureBox;
      
      // Set the location and size of the PictureBox control.
      this->PictureBox1->Location = System::Drawing::Point( 70, 120 );
      this->PictureBox1->Size = System::Drawing::Size( 140, 140 );
      this->PictureBox1->TabStop = false;
      
      // Set the SizeMode property to the StretchImage value.  This
      // will shrink or enlarge the image as needed to fit into
      // the PictureBox.
      this->PictureBox1->SizeMode = PictureBoxSizeMode::StretchImage;
      
      // Set the border style to a three-dimensional border.
      this->PictureBox1->BorderStyle = BorderStyle::Fixed3D;
      
      // Add the PictureBox to the form.
      this->Controls->Add( this->PictureBox1 );
   }

   void ListView1_MouseDown( Object^ /*sender*/, MouseEventArgs^ e )
   {
      ListViewItem^ selection = ListView1->GetItemAt( e->X, e->Y );
      
      // If the user selects an item in the ListView, display
      // the image in the PictureBox.
      if ( selection != nullptr )
      {
         PictureBox1->Image = System::Drawing::Image::FromFile( selection->SubItems[ 1 ]->Text );
      }
   }
private void PopulateListView()
{
    ListView1.Width = 270;
    ListView1.Location = new System.Drawing.Point(10, 10);

    // Declare and construct the ColumnHeader objects.
    ColumnHeader header1, header2;
    header1 = new ColumnHeader();
    header2 = new ColumnHeader();

    // Set the text, alignment and width for each column header.
    header1.Text = "File name";
    header1.TextAlign = HorizontalAlignment.Left;
    header1.Width = 70;

    header2.TextAlign = HorizontalAlignment.Left;
    header2.Text = "Location";
    header2.Width = 200;

    // Add the headers to the ListView control.
    ListView1.Columns.Add(header1);
    ListView1.Columns.Add(header2);

    // Specify that each item appears on a separate line.
    ListView1.View = View.Details;
    
    // Populate the ListView.Items property.
    // Set the directory to the sample picture directory.
    System.IO.DirectoryInfo dirInfo = 
        new System.IO.DirectoryInfo(
        "C:\\Documents and Settings\\All Users" +
        "\\Documents\\My Pictures\\Sample Pictures");

    // Get the .jpg files from the directory
    System.IO.FileInfo[] files = dirInfo.GetFiles("*.jpg");

    // Add each file name and full name including path
    // to the ListView.
    if (files != null)
    {
        foreach ( System.IO.FileInfo file in files )
        {
            ListViewItem item = new ListViewItem(file.Name);
            item.SubItems.Add(file.FullName);
            ListView1.Items.Add(item);
        }
    }
}

private void InitializePictureBox()
{
    PictureBox1 = new PictureBox();

    // Set the location and size of the PictureBox control.
    this.PictureBox1.Location = new System.Drawing.Point(70, 120);
    this.PictureBox1.Size = new System.Drawing.Size(140, 140);
    this.PictureBox1.TabStop = false;

    // Set the SizeMode property to the StretchImage value.  This
    // will shrink or enlarge the image as needed to fit into
    // the PictureBox.
    this.PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

    // Set the border style to a three-dimensional border.
    this.PictureBox1.BorderStyle = BorderStyle.Fixed3D;

    // Add the PictureBox to the form.
    this.Controls.Add(this.PictureBox1);
}

private void ListView1_MouseDown(object sender, MouseEventArgs e)
{

    ListViewItem selection = ListView1.GetItemAt(e.X, e.Y);

    // If the user selects an item in the ListView, display
    // the image in the PictureBox.
    if (selection != null)
    {
        PictureBox1.Image = System.Drawing.Image.FromFile(
            selection.SubItems[1].Text);
    }
}
Private Sub PopulateListView()
    ListView1.Width = 270
    ListView1.Location = New System.Drawing.Point(10, 10)

    ' Declare and construct the ColumnHeader objects.
    Dim header1, header2 As ColumnHeader
    header1 = New ColumnHeader
    header2 = New ColumnHeader

    ' Set the text, alignment and width for each column header.
    header1.Text = "File name"
    header1.TextAlign = HorizontalAlignment.Left
    header1.Width = 70

    header2.TextAlign = HorizontalAlignment.Left
    header2.Text = "Location"
    header2.Width = 200

    ' Add the headers to the ListView control.
    ListView1.Columns.Add(header1)
    ListView1.Columns.Add(header2)

    ' Specify that each item appears on a separate line.
    ListView1.View = View.Details

    ' Populate the ListView.Items property.
    ' Set the directory to the sample picture directory.
    Dim dirInfo As New System.IO.DirectoryInfo _
        ("C:\Documents and Settings\All Users" _
        & "\Documents\My Pictures\Sample Pictures")
    Dim file As System.IO.FileInfo

    ' Get the .jpg files from the directory
    Dim files() As System.io.FileInfo = dirInfo.GetFiles("*.jpg")

    ' Add each file name and full name including path
    ' to the ListView.
    If (files IsNot Nothing) Then
        For Each file In files
            Dim item As New ListViewItem(file.Name)
            item.SubItems.Add(file.FullName)
            ListView1.Items.Add(item)
        Next
    End If
End Sub

Private Sub InitializePictureBox()
    PictureBox1 = New PictureBox

    ' Set the location and size of the PictureBox control.
    Me.PictureBox1.Location = New System.Drawing.Point(70, 120)
    Me.PictureBox1.Size = New System.Drawing.Size(140, 140)
    Me.PictureBox1.TabStop = False

    ' Set the SizeMode property to the StretchImage value.  This
    ' will shrink or enlarge the image as needed to fit into
    ' the PictureBox.
    Me.PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage

    ' Set the border style to a three-dimensional border.
    Me.PictureBox1.BorderStyle = BorderStyle.Fixed3D

    ' Add the PictureBox to the form.
    Me.Controls.Add(Me.PictureBox1)

End Sub


Private Sub ListView1_MouseDown(ByVal sender As Object, _
    ByVal e As MouseEventArgs) Handles ListView1.MouseDown

    Dim selection As ListViewItem = ListView1.GetItemAt(e.X, e.Y)

    ' If the user selects an item in the ListView, display
    ' the image in the PictureBox.
    If (selection IsNot Nothing) Then
        PictureBox1.Image = System.Drawing.Image.FromFile _
            (selection.SubItems(1).Text)
    End If


End Sub

Remarks

El método GetItemAt permite determinar qué elemento se encuentra en una ubicación específica dentro de la región cliente del control ListView.The GetItemAt method lets you determine which item is located at a specific location within the client region of the ListView control. Puede utilizar este método cuando el usuario haga clic con el botón secundario en un subelemento (cuando la propiedad View esté establecida en View.Details) y desee determinar qué elemento es el propietario del subelemento en el que se hizo clic en función de las coordenadas del mouse en el momento en que el usuario hizo clic con el mouse.You can use this method when the user clicks or right-clicks a subitem (when the View property is set to View.Details) and you want to determine which item owns the subitem that was clicked based on the mouse coordinates at the time the user clicked the mouse.

Note

Cuando se falseel valor de la propiedad FullRowSelect, este método devuelve un elemento solo cuando la ubicación especificada está dentro de los límites del elemento primario (que se muestra en la primera columna cuando el control está en modo de detalles).When the FullRowSelect property value is false, this method returns an item only when the specified location is within the bounds of the parent item (which is displayed in the first column when the control is in details mode). Debe establecer la propiedad FullRowSelect en true para recuperar un elemento con este método dada una ubicación dentro de los límites de un subelemento.You must set the FullRowSelect property to true to retrieve an item with this method given a location within the bounds of a subitem. También puede utilizar el método HitTest para recuperar información detallada sobre el elemento en una ubicación determinada.You can also use the HitTest method to retrieve detailed information about the item at a particular location.

Para realizar una reposición de los elementos en un ListViewde arrastrar y colocar, es posible que desee utilizar el método ListViewInsertionMark.NearestIndex en lugar del método GetItemAt.To do drag-and-drop repositioning of items within a ListView, you might want to use the ListViewInsertionMark.NearestIndex method rather than the GetItemAt method. El método ListViewInsertionMark.NearestIndex busca el elemento más cercano, independientemente de dónde se encuentre el puntero del mouse.The ListViewInsertionMark.NearestIndex method finds the closest item regardless of where the mouse pointer is located. Por otro lado, el método GetItemAt devuelve null si no hay ningún elemento en la ubicación especificada.The GetItemAt method, on the other hand, returns null if there is no item at the specified location.

Note

La clase ListViewInsertionMark solo se admite en Windows XP y Windows Server 2003 cuando la aplicación llama al método Application.EnableVisualStyles.The ListViewInsertionMark class is supported only on Windows XP and Windows Server 2003 when your application calls the Application.EnableVisualStyles method.

Applies to

See also