MenuItem.DrawItem 事件

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

當功能表項目的 OwnerDraw 屬性設定為 true 並且有繪製功能表項目的要求時發生。

public:
 event System::Windows::Forms::DrawItemEventHandler ^ DrawItem;

public event System.Windows.Forms.DrawItemEventHandler DrawItem;

member this.DrawItem : System.Windows.Forms.DrawItemEventHandler 

Public Custom Event DrawItem As DrawItemEventHandler 

事件類型

DrawItemEventHandler

範例

下列程式碼範例示範如何處理 DrawItem 事件。 本範例會使用 Brush 和 Font 繪製功能表項目，然後在功能表項目周圍繪製 Rectangle 。 此繪圖是透過 Graphics 物件執行，此物件會傳遞至 參數中的 DrawItemEventArgs 事件處理常式。 此範例會要求您已將專案的 屬性初始化 OwnerDraw 為 true 。 針對 C# 範例，在 表單的建構函式後面 InitializeComponent 新增下列程式碼，以連結 事件：

this.menuItem1.DrawItem += new DrawItemEventHandler(menuItem1_DrawItem);

   // The DrawItem event handler.
private:
   void menuItem1_DrawItem( Object^ /*sender*/, System::Windows::Forms::DrawItemEventArgs^ e )
   {
      String^ myCaption = "Owner Draw Item1";

      // Create a Brush and a Font with which to draw the item.
      Brush^ myBrush = System::Drawing::Brushes::AliceBlue;
      System::Drawing::Font^ myFont = gcnew System::Drawing::Font( FontFamily::GenericSerif,14,FontStyle::Underline,GraphicsUnit::Pixel );
      SizeF mySizeF = e->Graphics->MeasureString( myCaption, myFont );

      // Draw the item, and then draw a Rectangle around it.
      e->Graphics->DrawString( myCaption, myFont, myBrush, (float)e->Bounds.X, (float)e->Bounds.Y );
      e->Graphics->DrawRectangle( Pens::Black, Rectangle(e->Bounds.X,e->Bounds.Y,Convert::ToInt32( mySizeF.Width ),Convert::ToInt32( mySizeF.Height )) );
   }

// The DrawItem event handler.
private void menuItem1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
{

    string myCaption = "Owner Draw Item1";

    // Create a Brush and a Font with which to draw the item.
    Brush myBrush = System.Drawing.Brushes.AliceBlue;
    Font myFont = new Font(FontFamily.GenericSerif, 14, FontStyle.Underline, GraphicsUnit.Pixel);
    SizeF mySizeF = e.Graphics.MeasureString(myCaption, myFont);

    // Draw the item, and then draw a Rectangle around it.
    e.Graphics.DrawString(myCaption, myFont, myBrush, e.Bounds.X, e.Bounds.Y);
    e.Graphics.DrawRectangle(Pens.Black, new Rectangle(e.Bounds.X, e.Bounds.Y, Convert.ToInt32(mySizeF.Width), Convert.ToInt32(mySizeF.Height)));
}

' The DrawItem event handler.
Private Sub MenuItem1_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles MenuItem1.DrawItem


    Dim MyCaption As String = "Owner Draw Item1"

    ' Create a Brush and a Font with which to draw the item.
    Dim MyBrush As System.Drawing.Brush = System.Drawing.Brushes.AliceBlue
    Dim MyFont As New Font(FontFamily.GenericSerif, 14, FontStyle.Underline, GraphicsUnit.Pixel)
    Dim MySizeF As SizeF = e.Graphics.MeasureString(MyCaption, MyFont)

    ' Draw the item, and then draw a Rectangle around it.
    e.Graphics.DrawString(MyCaption, MyFont, MyBrush, e.Bounds.X, e.Bounds.Y)
    e.Graphics.DrawRectangle(Drawing.Pens.Black, New Rectangle(e.Bounds.X, e.Bounds.Y, MySizeF.Width, MySizeF.Height))

End Sub

備註

DrawItemEventArgs傳遞至事件處理常式的 DrawItem 引數提供 Graphics 物件，可讓您在功能表項目介面上執行繪圖和其他圖形化作業。 您可以使用此事件處理常式來建立符合應用程式需求的自訂功能表。 如需處理事件的詳細資訊，請參閱 處理和引發事件。

另請參閱

• OwnerDraw
• MeasureItem