MeasureItemEventArgs Class


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Provides data for the MeasureItem event of the ListBox, ComboBox, CheckedListBox, and MenuItem controls.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)


public ref class MeasureItemEventArgs : EventArgs

System_CAPS_pubmethodMeasureItemEventArgs(Graphics^, Int32)

Initializes a new instance of the MeasureItemEventArgs class.

System_CAPS_pubmethodMeasureItemEventArgs(Graphics^, Int32, Int32)

Initializes a new instance of the MeasureItemEventArgs class providing a parameter for the item height.


Gets the Graphics object to measure against.


Gets the index of the item for which the height and width is needed.


Gets or sets the height of the item specified by the Index.


Gets or sets the width of the item specified by the Index.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

This event is sent when the OwnerDraw property of ListBox, ComboBox, CheckedListBox, or MenuItem is set to true. It is used to tell the drawing function how to size an item.

For information about the event model, see Handling and Raising Events.

The following code example demonstrates how to use the Graphics property to perform custom drawing of the items in a ListBox.

public ref class Form1: public System::Windows::Forms::Form
   System::Windows::Forms::ListBox^ listBox1;
   System::ComponentModel::Container^ components;

      if ( components != nullptr )
         delete components;


   /// <summary>
   /// Required method for Designer support - do not modify
   /// the contents of this method with the code editor.
   /// </summary>
   void InitializeComponent()
      this->listBox1 = gcnew System::Windows::Forms::ListBox;

      // listBox1
      this->listBox1->DrawMode = System::Windows::Forms::DrawMode::OwnerDrawVariable;
      this->listBox1->Location = System::Drawing::Point( 16, 48 );
      this->listBox1->Name = "listBox1";
      this->listBox1->SelectionMode = System::Windows::Forms::SelectionMode::MultiExtended;
      this->listBox1->Size = System::Drawing::Size( 256, 134 );
      this->listBox1->TabIndex = 0;
      this->listBox1->MeasureItem += gcnew System::Windows::Forms::MeasureItemEventHandler( this, &Form1::listBox1_MeasureItem );
      this->listBox1->DrawItem += gcnew System::Windows::Forms::DrawItemEventHandler( this, &Form1::listBox1_DrawItem );

      // Form1
      this->ClientSize = System::Drawing::Size( 292, 273 );
      array<System::Windows::Forms::Control^>^temp0 = {this->listBox1};
      this->Controls->AddRange( temp0 );
      this->Name = "Form1";
      this->Text = "Form1";
      this->ResumeLayout( false );

   void listBox1_MeasureItem( Object^ /*sender*/, MeasureItemEventArgs^ e )
      System::Drawing::Font^ font = (dynamic_cast<ListBoxFontItem^>(listBox1->Items[ e->Index ]))->Font;
      SizeF stringSize = e->Graphics->MeasureString( font->Name, font );

      // Set the height and width of the item
      e->ItemHeight = (int)stringSize.Height;
      e->ItemWidth = (int)stringSize.Width;

   // For efficiency, cache the brush to use for drawing.
   SolidBrush^ foreColorBrush;
   void listBox1_DrawItem( Object^ /*sender*/, DrawItemEventArgs^ e )
      Brush^ brush;

      // Create the brush using the ForeColor specified by the DrawItemEventArgs
      if ( foreColorBrush == nullptr )
            foreColorBrush = gcnew SolidBrush( e->ForeColor );
      if ( foreColorBrush->Color != e->ForeColor )
         // The control's ForeColor has changed, so dispose of the cached brush and
         // create a new one.
         delete foreColorBrush;
         foreColorBrush = gcnew SolidBrush( e->ForeColor );

      // Select the appropriate brush depending on if the item is selected.
      // Since State can be a combinateion (bit-flag) of enum values, you can't use
      // "==" to compare them.
      if ( (e->State & DrawItemState::Selected) == DrawItemState::Selected )
            brush = SystemBrushes::HighlightText;
            brush = foreColorBrush;

      // Perform the painting.
      System::Drawing::Font^ font = (dynamic_cast<ListBoxFontItem^>(listBox1->Items[ e->Index ]))->Font;
      e->Graphics->DrawString( font->Name, font, brush, e->Bounds );


   /// <summary>
   ///  A wrapper class for use with storing Fonts in a ListBox.  Since ListBox uses the
   ///  ToString() of its items for the text it displays, this class is needed to return
   ///  the name of the font, rather than its ToString() value.
   /// </summary>
   ref class ListBoxFontItem
      System::Drawing::Font^ Font;
      ListBoxFontItem( System::Drawing::Font^ f )
         Font = f;

      virtual String^ ToString() override
         return Font->Name;

int main()
   Application::Run( gcnew Form1 );

.NET Framework
Available since 1.1

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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