DrawMode Enumeración

Definición

Especifica cómo se dibujan los elementos de un control.Specifies how the elements of a control are drawn.

public enum class DrawMode
public enum DrawMode
type DrawMode = 
Public Enum DrawMode
Herencia
DrawMode

Campos

Normal 0

El sistema operativo dibuja todos los elementos de un control y tienen el mismo tamaño.All the elements in a control are drawn by the operating system and are of the same size.

OwnerDrawFixed 1

Todos los elementos del control se dibujan manualmente y tienen el mismo tamaño.All the elements in the control are drawn manually and are of the same size.

OwnerDrawVariable 2

Todos los elementos del control se dibujan manualmente, y pueden ser de distinto tamaño.All the elements in the control are drawn manually and can differ in size.

Ejemplos

En el ejemplo siguiente se muestra cómo crear elementos dibujados ListBox por el propietario.The following example demonstrates how to create owner-drawn ListBox items. El código usa la ListBox.DrawMode propiedad para especificar que los elementos dibujados tienen el tamaño fijo ListBox.DrawItem y el evento para realizar el dibujo ListBoxde cada elemento en.The code uses the ListBox.DrawMode property to specify that the items drawn are fixed sized and the ListBox.DrawItem event to perform the drawing of each item into the ListBox. En el ejemplo se usan las propiedades y los DrawItemEventArgs métodos de la clase que se pasa como parámetro al controlador de eventos para dibujar los elementos.The example uses the properties and methods of the DrawItemEventArgs class passed as a parameter to the event handler to draw the items. En este ejemplo se da ListBox por supuesto listBox1 que se ha agregado un control llamado a ListBox.DrawItem un formulario y que el evento está controlado por el controlador de eventos definido en el ejemplo.This example assumes that a ListBox control called listBox1 has been added to a form and that the ListBox.DrawItem event is handled by the event handler defined in the example. En el ejemplo también se supone que los elementos se han ListBox agregado a con el texto "Apple", "Orange" y "ciruela" en ese orden.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();
}
Private WithEvents ListBox1 As New ListBox()

Private Sub 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
    Controls.Add(ListBox1)

End Sub

Private Sub ListBox1_DrawItem(ByVal sender As Object, _
 ByVal e As System.Windows.Forms.DrawItemEventArgs) _
 Handles ListBox1.DrawItem

    ' Draw the background of the ListBox control for each item.
    e.DrawBackground()

    ' Define the default color of the brush as black.
    Dim myBrush As Brush = Brushes.Black

    ' Determine the color of the brush to draw each item based on   
    ' the index of the item to draw.
    Select Case e.Index
        Case 0
            myBrush = Brushes.Red
        Case 1
            myBrush = Brushes.Orange
        Case 2
            myBrush = Brushes.Purple
    End Select

    ' 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()
End Sub

Comentarios

DrawMode Esta enumeración la usan miembros como en las ListBoxclases, CheckedListBoxy. ComboBoxThis enumeration is used by members such as DrawMode in the ListBox, CheckedListBox, and ComboBox classes.

Puede invalidar el dibujo de algunos controles o ciertos elementos.You can override the drawing of some controls or certain elements. Esta enumeración se usa para especificar si el sistema operativo dibuja un control o si su propio código controla el dibujo del control.This enumeration is used to specify if a control is drawn by the operating system or if your own code handles the drawing of the control.

Nota

La CheckedListBox clase solo admite Normal; los modos de dibujo del propietario se omiten.The CheckedListBox class only supports Normal; owner draw modes are ignored.

Para obtener más información sobre cómo DrawMode usar la enumeración MeasureItem , DrawItem vea los eventos y ItemHeight y la propiedad.For more information about using the DrawMode enumeration, see the MeasureItem and DrawItem events, and the ItemHeight property.

Se aplica a

Consulte también: