DrawItemEventHandler DrawItemEventHandler DrawItemEventHandler DrawItemEventHandler Delegate

定義

ComboBoxListBoxMenuItemTabControl の各コントロールのいずれかの DrawItem イベントを処理するメソッドを表しますRepresents the method that will handle the DrawItem event of a ComboBox, ListBox, MenuItem, or TabControl control.

public delegate void DrawItemEventHandler(System::Object ^ sender, DrawItemEventArgs ^ e);
public delegate void DrawItemEventHandler(object sender, DrawItemEventArgs e);
type DrawItemEventHandler = delegate of obj * DrawItemEventArgs -> unit
Public Delegate Sub DrawItemEventHandler(sender As Object, e As DrawItemEventArgs)

パラメーター

sender
Object Object Object Object

イベントのソース。The source of the event.

e
DrawItemEventArgs DrawItemEventArgs DrawItemEventArgs DrawItemEventArgs

イベント データを格納している DrawItemEventArgsA DrawItemEventArgs that contains the event data.

継承
DrawItemEventHandlerDrawItemEventHandlerDrawItemEventHandlerDrawItemEventHandler

次のコード例では、オーナー描画メニュー項目にメニューを示します。The following code example demonstrates a menu with an owner-drawn menu item. この例では、AddHandlerステートメントおよびAddressOfを処理するデリゲートを指定する演算子、MenuItem.DrawItemイベント。This example uses the AddHandler statement and the AddressOf operator to designate a delegate to handle the MenuItem.DrawItem event. 実行するには、例は、それを System、System.Windows.Forms、System.Drawing 名前空間をインポートする形式で貼り付けます。To run the example place paste it in a form that imports the System, System.Windows.Forms, and System.Drawing namespaces. すべてのイベントがイベント処理メソッド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-handling methods.

internal:
   // Declare the MainMenu control.
   System::Windows::Forms::MainMenu^ MainMenu1;

   // Declare MenuItem2 as With-Events because it will be user drawn.
   System::Windows::Forms::MenuItem^ MenuItem2;

private:
   void InitializeMenu()
   {
      
      // Create MenuItem1, which will be drawn by the operating system.
      MenuItem^ MenuItem1 = gcnew MenuItem( "Regular Menu Item" );
      
      // Create MenuItem2.
      MenuItem2 = gcnew MenuItem( "Custom Menu Item" );
      
      // Set OwnerDraw property to true. This requires handling the
      // DrawItem event for this menu item.
      MenuItem2->OwnerDraw = true;
      
      //Add the event-handler delegate to handle the DrawItem event.
      MenuItem2->DrawItem += gcnew DrawItemEventHandler( this, &Form1::DrawCustomMenuItem );
      
      // Add the items to the menu.
      array<MenuItem^>^temp0 = {MenuItem1,MenuItem2};
      MainMenu1 = gcnew MainMenu( temp0 );
      
      // Add the menu to the form.
      this->Menu = this->MainMenu1;
   }

   // Draw the custom menu item.
   void DrawCustomMenuItem( Object^ sender, DrawItemEventArgs^ e )
   {
      // Cast the sender to MenuItem so you can access text property.
      MenuItem^ customItem = dynamic_cast<MenuItem^>(sender);
      
      // Create a Brush and a Font to draw the MenuItem.
      System::Drawing::Brush^ aBrush = System::Drawing::Brushes::DarkMagenta;
      System::Drawing::Font^ aFont = gcnew System::Drawing::Font( "Garamond",10,FontStyle::Italic,GraphicsUnit::Point );
      
      // Get the size of the text to use later to draw an ellipse
      // around the item.
      SizeF stringSize = e->Graphics->MeasureString( customItem->Text, aFont );
      
      // Draw the item and then draw the ellipse.
      e->Graphics->DrawString( customItem->Text, aFont, aBrush, (float)e->Bounds.X, (float)e->Bounds.Y );
      e->Graphics->DrawEllipse( gcnew Pen( System::Drawing::Color::Black,2 ), Rectangle(e->Bounds.X,e->Bounds.Y,(System::Int32)stringSize.Width,(System::Int32)stringSize.Height) );
   }
// Declare the MainMenu control.
internal System.Windows.Forms.MainMenu MainMenu1;

// Declare MenuItem2 as With-Events because it will be user drawn.
internal System.Windows.Forms.MenuItem MenuItem2;


private void InitializeMenu()
{

	// Create MenuItem1, which will be drawn by the operating system.
	MenuItem MenuItem1 = new MenuItem("Regular Menu Item");

	// Create MenuItem2.
	MenuItem2 = new MenuItem("Custom Menu Item");

	// Set OwnerDraw property to true. This requires handling the
	// DrawItem event for this menu item.
	MenuItem2.OwnerDraw = true;

	//Add the event-handler delegate to handle the DrawItem event.
       MenuItem2.DrawItem += new DrawItemEventHandler(DrawCustomMenuItem);
	
     // Add the items to the menu.
	MainMenu1 = new MainMenu(new MenuItem[]{MenuItem1, MenuItem2});																													  

	// Add the menu to the form.
	this.Menu = this.MainMenu1;
}

// Draw the custom menu item.
private void DrawCustomMenuItem(object sender, 
	DrawItemEventArgs e)
{

	// Cast the sender to MenuItem so you can access text property.
	MenuItem customItem = (MenuItem) sender;

	// Create a Brush and a Font to draw the MenuItem.
	System.Drawing.Brush aBrush = System.Drawing.Brushes.DarkMagenta;
	Font aFont = new Font("Garamond", 10, 
		FontStyle.Italic, GraphicsUnit.Point);

	// Get the size of the text to use later to draw an ellipse
	// around the item.
	SizeF stringSize = e.Graphics.MeasureString(
		customItem.Text, aFont);

	// Draw the item and then draw the ellipse.
	e.Graphics.DrawString(customItem.Text, aFont, 
		aBrush, e.Bounds.X, e.Bounds.Y);
	e.Graphics.DrawEllipse(new Pen(System.Drawing.Color.Black, 2),
		new Rectangle(e.Bounds.X, e.Bounds.Y, 
		(System.Int32)stringSize.Width,
		(System.Int32)stringSize.Height));
}
' Declare the MainMenu control.
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu

' Declare MenuItem2 as With-Events because it will be user drawn.
Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem


Private Sub InitializeMenu()

    ' Create MenuItem1, which will be drawn by the operating system.
    Dim MenuItem1 As New MenuItem("Regular Menu Item")

    ' Create MenuItem2.
    MenuItem2 = New MenuItem("Custom Menu Item")

    ' Set OwnerDraw property to true. This requires handling the
    ' DrawItem event for this menu item.
    MenuItem2.OwnerDraw = True

    'Add the event-handler delegate to handle the DrawItem event.
    AddHandler MenuItem2.DrawItem, New DrawItemEventHandler(AddressOf DrawCustomMenuItem)

    ' Add the items to the menu.
    MainMenu1 = New MainMenu(New MenuItem() {MenuItem1, MenuItem2})

    ' Add the menu to the form.
    Me.Menu = Me.MainMenu1
End Sub

' Draw the custom menu item.
Private Sub DrawCustomMenuItem(ByVal sender As Object, ByVal e As _
        System.Windows.Forms.DrawItemEventArgs)

    ' Cast the sender to MenuItem so you can access text property.
    Dim customItem As MenuItem = CType(sender, MenuItem)

    ' Create a Brush and a Font to draw the MenuItem.
    Dim aBrush As System.Drawing.Brush = System.Drawing.Brushes.DarkMagenta
    Dim aFont As New Font("Garamond", 10, FontStyle.Italic, _
        GraphicsUnit.Point)

    ' Get the size of the text to use later to draw an ellipse
    ' around the item.
    Dim stringSize As SizeF = e.Graphics.MeasureString( _
        customItem.Text, aFont)

    ' Draw the item and then draw the ellipse.
    e.Graphics.DrawString(customItem.Text, aFont, _
        aBrush, e.Bounds.X, e.Bounds.Y)
    e.Graphics.DrawEllipse(New Pen(System.Drawing.Color.Black, 2), _
        New Rectangle(e.Bounds.X, e.Bounds.Y, CInt(stringSize.Width), _
        CInt(stringSize.Height)))
End Sub

注釈

DrawItemEventArgs デリゲートを作成する場合は、イベントを処理するメソッドを指定します。When you create a DrawItemEventArgs delegate, you identify the method that will handle the event. イベントをイベント ハンドラーに関連付けるには、デリゲートのインスタンスをイベントに追加します。To associate the event with your event handler, add an instance of the delegate to the event. デリゲートを削除しない限り、そのイベントが発生すると常にイベント ハンドラーが呼び出されます。The event handler is called whenever the event occurs, unless you remove the delegate. イベント ハンドラー デリゲートの詳細については、次を参照してください。処理とイベントの発生します。For more information about event handler delegates, see Handling and Raising Events.

Extension Methods

GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate)

指定したデリゲートによって表されるメソッドを表すオブジェクトを取得します。Gets an object that represents the method represented by the specified delegate.

適用対象

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