ListView.GetItemAt(Int32, Int32) メソッド

定義

指定した位置にある項目を取得します。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

パラメーター

x
Int32

項目を検索する位置の x 座標 (クライアント座標)。The x-coordinate of the location to search for an item (expressed in client coordinates).

y
Int32

項目を検索する位置の y 座標 (クライアント座標)。The y-coordinate of the location to search for an item (expressed in client coordinates).

戻り値

指定した位置にある項目を表す ListViewItemA ListViewItem that represents the item at the specified position. 指定した位置に項目がない場合、メソッドは null を返します。If there is no item at the specified location, the method returns null.

次のコード例は、PictureBox および ListView コントロールの使用方法を示しています。The following code example demonstrates the use of the PictureBox and ListView controls. @No__t-0 は、それぞれ BorderStyle と @no__t 4 の列挙体を使用して PictureBox.BorderStylePictureBox.SizeMode のプロパティを設定することによって初期化されます。The PictureBox is initialized by setting the PictureBox.BorderStyle and PictureBox.SizeMode properties using the BorderStyle and PictureBoxSizeMode enumerations, respectively. @No__t-0 には Samples ディレクトリの画像が設定されます。The ListView is populated with pictures from the Samples directory. @No__t-0 メソッドは、項目が選択されているかどうかを判断するために、ListView コントロールの MouseDown イベントを処理するときに使用されます。The GetItemAt method is used in when handling the ListView control's MouseDown event to determine whether an item is selected. 項目が選択されている場合、イベントハンドラーは、PictureBox.Image プロパティを設定して、選択されたファイルを表示します。If an item is selected, the event handler displays the selected file by setting the PictureBox.Image property. この例では、C:\documents and および Settings\All Users\Documents\My Pictures\sample pictures Pictures ディレクトリにある JPG ファイルが存在する必要があります。The example requires the existence of JPG files located in the C:\documents and Settings\All Users\Documents\My Pictures\Sample Pictures directory. この例を実行するには、フォームにコードを貼り付け、フォームのコンストラクターまたは Load メソッドで InitializePictureBox および PopulateListView メソッドを呼び出します。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. すべてのイベントがイベントハンドラーに関連付けられていることを確認します。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

注釈

@No__t-0 メソッドを使用すると、ListView コントロールのクライアント領域内の特定の位置にある項目を特定できます。The GetItemAt method lets you determine which item is located at a specific location within the client region of the ListView control. ユーザーがクリックするか、サブ項目を右クリックしたときに、このメソッドを使用することができます (ときに、Viewプロパティに設定されてView.Details) し、どの項目がクリックされたユーザーがマウスをクリックした時に、マウスの座標に基づいてサブアイテムを所有しているを確認します。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.

注意

@No__t-0 プロパティの値 @no__t が-1 の場合、このメソッドは、指定された位置が親項目の境界内にある場合にのみ項目を返します (コントロールが詳細モードの場合は、最初の列に表示されます)。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). このメソッドを使用して項目を取得するには、FullRowSelect プロパティを true に設定する必要があります。これにより、サブ項目の境界内の位置が指定されます。You must set the FullRowSelect property to true to retrieve an item with this method given a location within the bounds of a subitem. @No__t-0 メソッドを使用して、特定の場所にある項目に関する詳細情報を取得することもできます。You can also use the HitTest method to retrieve detailed information about the item at a particular location.

@No__t 0 内の項目のドラッグアンドドロップによる移動を行うには、GetItemAt メソッドではなく ListViewInsertionMark.NearestIndex メソッドを使用することができます。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. @No__t-0 メソッドは、マウスポインターが置かれている場所に関係なく、最も近い項目を検索します。The ListViewInsertionMark.NearestIndex method finds the closest item regardless of where the mouse pointer is located. 一方、GetItemAt のメソッドは、指定された場所に項目がない場合は null を返します。The GetItemAt method, on the other hand, returns null if there is no item at the specified location.

注意

@No__t-0 クラスは、アプリケーションが Application.EnableVisualStyles メソッドを呼び出した場合に、Windows XP と Windows Server 2003 でのみサポートされます。The ListViewInsertionMark class is supported only on Windows XP and Windows Server 2003 when your application calls the Application.EnableVisualStyles method.

適用対象

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