ListView.GetItemAt(Int32, Int32) ListView.GetItemAt(Int32, Int32) ListView.GetItemAt(Int32, Int32) ListView.GetItemAt(Int32, Int32) Method

Définition

Récupère l'élément situé à l'emplacement spécifié.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

Paramètres

x
Int32 Int32 Int32 Int32

Coordonnée x de l’emplacement auquel rechercher un élément (exprimé en coordonnées clientes).The x-coordinate of the location to search for an item (expressed in client coordinates).

y
Int32 Int32 Int32 Int32

Coordonnée y de l’emplacement auquel rechercher un élément (exprimé en coordonnées clientes).The y-coordinate of the location to search for an item (expressed in client coordinates).

Retours

Un ListViewItem qui représente l’élément à la position spécifiée.A ListViewItem that represents the item at the specified position. Si aucun élément à l’emplacement spécifié, la méthode ne retourne null.If there is no item at the specified location, the method returns null.

Exemples

L’exemple de code suivant illustre l’utilisation de la PictureBox et ListView contrôles.The following code example demonstrates the use of the PictureBox and ListView controls. Le PictureBox est initialisé en définissant le PictureBox.BorderStyle et PictureBox.SizeMode propriétés à l’aide de la BorderStyle et PictureBoxSizeMode énumérations, respectivement.The PictureBox is initialized by setting the PictureBox.BorderStyle and PictureBox.SizeMode properties using the BorderStyle and PictureBoxSizeMode enumerations, respectively. Le ListView est rempli avec les images à partir du répertoire Samples.The ListView is populated with pictures from the Samples directory. Le GetItemAt méthode est utilisée lors de la gestion de la ListView du contrôle MouseDown événement pour déterminer si un élément est sélectionné.The GetItemAt method is used in when handling the ListView control's MouseDown event to determine whether an item is selected. Si un élément est sélectionné, le Gestionnaire d’événements affiche le fichier sélectionné en définissant le PictureBox.Image propriété.If an item is selected, the event handler displays the selected file by setting the PictureBox.Image property. L’exemple requiert l’existence de fichiers JPG dans le répertoire C:\documents and Settings\All Users\Documents\My Pictures\Sample Pictures.The example requires the existence of JPG files located in the C:\documents and Settings\All Users\Documents\My Pictures\Sample Pictures directory. Pour exécuter cet exemple, collez le code dans un formulaire et appelez le InitializePictureBox et PopulateListView méthodes dans le constructeur du formulaire ou Load (méthode).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. Vérifiez que tous les événements sont associés à leurs gestionnaires d’événements.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

Remarques

Le GetItemAt méthode vous permet de déterminer quel élément se trouve dans un emplacement spécifique dans la zone cliente de la ListView contrôle.The GetItemAt method lets you determine which item is located at a specific location within the client region of the ListView control. Vous pouvez utiliser cette méthode lorsque l’utilisateur clique ou clique sur un sous-élément (lorsque le View propriété est définie sur View.Details) et que vous souhaitez déterminer quel élément appartient le sous-élément qui a été cliqué selon les coordonnées de la souris au moment où l’utilisateur a cliqué sur la souris .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.

Notes

Lorsque le FullRowSelect valeur de propriété est false, cette méthode retourne un élément uniquement lorsque l’emplacement spécifié se trouve dans les limites de l’élément parent (qui est affichée dans la première colonne lorsque le contrôle est en mode Détails).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). Vous devez définir le FullRowSelect propriété true pour récupérer un élément avec cette méthode à un emplacement donnée dans les limites d’un sous-élément.You must set the FullRowSelect property to true to retrieve an item with this method given a location within the bounds of a subitem. Vous pouvez également utiliser le HitTest méthode pour récupérer des informations détaillées sur l’élément à un emplacement particulier.You can also use the HitTest method to retrieve detailed information about the item at a particular location.

Faire glisser-déplacer repositionnement d’éléments dans un ListView, vous souhaiterez peut-être utiliser le ListViewInsertionMark.NearestIndex méthode plutôt que la GetItemAt (méthode).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. Le ListViewInsertionMark.NearestIndex méthode recherche l’élément le plus proche, quel que soit l’où se trouve le pointeur de la souris.The ListViewInsertionMark.NearestIndex method finds the closest item regardless of where the mouse pointer is located. Le GetItemAt (méthode), en revanche, retourne null s’il n’existe aucun élément à l’emplacement spécifié.The GetItemAt method, on the other hand, returns null if there is no item at the specified location.

Notes

Le ListViewInsertionMark classe est prise en charge uniquement sur Windows XP et Windows Server 2003 lorsque votre application appelle la Application.EnableVisualStyles (méthode).The ListViewInsertionMark class is supported only on Windows XP and Windows Server 2003 when your application calls the Application.EnableVisualStyles method.

S’applique à

Voir aussi