DrawItemEventArgs Class

 

Provides data for the DrawItem event.

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

System.Object
  System.EventArgs
    System.Windows.Forms.DrawItemEventArgs
      System.Windows.Forms.StatusBarDrawItemEventArgs

public class DrawItemEventArgs : EventArgs

NameDescription
System_CAPS_pubmethodDrawItemEventArgs(Graphics, Font, Rectangle, Int32, DrawItemState)

Initializes a new instance of the DrawItemEventArgs class for the specified control with the specified font, state, surface to draw on, and the bounds to draw within.

System_CAPS_pubmethodDrawItemEventArgs(Graphics, Font, Rectangle, Int32, DrawItemState, Color, Color)

Initializes a new instance of the DrawItemEventArgs class for the specified control with the specified font, state, foreground color, background color, surface to draw on, and the bounds to draw within.

NameDescription
System_CAPS_pubpropertyBackColor

Gets the background color of the item that is being drawn.

System_CAPS_pubpropertyBounds

Gets the rectangle that represents the bounds of the item that is being drawn.

System_CAPS_pubpropertyFont

Gets the font that is assigned to the item being drawn.

System_CAPS_pubpropertyForeColor

Gets the foreground color of the of the item being drawn.

System_CAPS_pubpropertyGraphics

Gets the graphics surface to draw the item on.

System_CAPS_pubpropertyIndex

Gets the index value of the item that is being drawn.

System_CAPS_pubpropertyState

Gets the state of the item being drawn.

NameDescription
System_CAPS_pubmethodDrawBackground()

Draws the background within the bounds specified in the DrawItemEventArgs constructor and with the appropriate color.

System_CAPS_pubmethodDrawFocusRectangle()

Draws a focus rectangle within the bounds specified in the DrawItemEventArgs constructor.

System_CAPS_pubmethodEquals(Object)

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

System_CAPS_protmethodFinalize()

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

System_CAPS_pubmethodGetHashCode()

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

System_CAPS_pubmethodGetType()

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

System_CAPS_protmethodMemberwiseClone()

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

System_CAPS_pubmethodToString()

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

The DrawItem event is raised by owner draw controls, such as the ListBox and ComboBox controls. It contains all the information that is needed for the user to paint the specified item, including the item index, the Rectangle, and the Graphics on which the drawing should be done.

The following example demonstrates how to create owner-drawn ListBox items. The code uses the DrawMode property to specify that the items drawn are fixed sized and the DrawItem event to perform the drawing of each item into the ListBox. The example code uses the properties and methods of the DrawItemEventArgs class passed as a parameter to the event handler to draw the items. This example assumes that a ListBox control that is named listBox1 has been added to a form and that the DrawItem event is handled by the event handler defined in the example code. The example also assumes that items have been added to the ListBox with the text of "Apple", "Orange", and "Plum" in that order.

private ListBox ListBox1 = new ListBox();
private void InitializeListBox()
{
    ListBox1.Items.AddRange(new Object[] 
        { "Red Item", "Orange Item", "Purple Item" });
    ListBox1.Location = new System.Drawing.Point(81, 69);
    ListBox1.Size = new System.Drawing.Size(120, 95);
    ListBox1.DrawMode = DrawMode.OwnerDrawFixed;
    ListBox1.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);
    Controls.Add(ListBox1);
}

private void ListBox1_DrawItem(object sender, 
    System.Windows.Forms.DrawItemEventArgs e)
{
    // Draw the background of the ListBox control for each item.
    e.DrawBackground();
    // Define the default color of the brush as black.
    Brush myBrush = Brushes.Black;

    // Determine the color of the brush to draw each item based 
    // on the index of the item to draw.
    switch (e.Index)
    {
        case 0:
            myBrush = Brushes.Red;
            break;
        case 1:
            myBrush = Brushes.Orange;
            break;
        case 2:
            myBrush = Brushes.Purple;
            break;
    }

    // Draw the current item text based on the current Font 
    // and the custom brush settings.
    e.Graphics.DrawString(ListBox1.Items[e.Index].ToString(), 
        e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
    // If the ListBox has focus, draw a focus rectangle around the selected item.
    e.DrawFocusRectangle();
}

.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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