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Clase DrawListViewSubItemEventArgs

 

Publicado: noviembre de 2016

Proporciona datos para el evento ListView.DrawSubItem.

Espacio de nombres:   System.Windows.Forms
Ensamblado:  System.Windows.Forms (en System.Windows.Forms.dll)

System.Object
  System.EventArgs
    System.Windows.Forms.DrawListViewSubItemEventArgs

public class DrawListViewSubItemEventArgs : EventArgs

NombreDescripción
System_CAPS_pubpropertyBounds

Obtiene el tamaño y la ubicación de la ListViewItem.ListViewSubItem para dibujar.

System_CAPS_pubpropertyColumnIndex

Obtiene el índice de la ListView columna en la cual el ListViewItem.ListViewSubItem se muestra.

System_CAPS_pubpropertyDrawDefault

Obtiene o establece un valor que indica si la ListViewItem.ListViewSubItem se debe dibujar el sistema operativo en lugar de dibujado por el propietario.

System_CAPS_pubpropertyGraphics

Obtiene el Graphics utilizado para dibujar el ListViewItem.ListViewSubItem.

System_CAPS_pubpropertyHeader

Obtiene el encabezado de la ListView columna en la cual el ListViewItem.ListViewSubItem se muestra.

System_CAPS_pubpropertyItem

Obtiene el elemento primario ListViewItem de la ListViewItem.ListViewSubItem para dibujar.

System_CAPS_pubpropertyItemIndex

Obtiene el índice del elemento primario ListViewItem de la ListViewItem.ListViewSubItem para dibujar.

System_CAPS_pubpropertyItemState

Obtiene el estado actual del elemento primario ListViewItem de la ListViewItem.ListViewSubItem para dibujar.

System_CAPS_pubpropertySubItem

Obtiene el ListViewItem.ListViewSubItem para dibujar.

NombreDescripción
System_CAPS_pubmethodDrawBackground()

Dibuja el fondo de la ListViewItem.ListViewSubItem utilizando el color de fondo actual.

System_CAPS_pubmethodDrawFocusRectangle(Rectangle)

Dibuja un rectángulo de foco para la ListViewItem.ListViewSubItem Si el elemento primario ListViewItem tiene el foco.

System_CAPS_pubmethodDrawText()

Dibuja el texto de la ListViewItem.ListViewSubItem utilizando el color de primer plano actual.

System_CAPS_pubmethodDrawText(TextFormatFlags)

Dibuja el texto de la ListViewItem.ListViewSubItem utilizando el color de primer plano actual y dándole formato con los valores especificados TextFormatFlags valores.

System_CAPS_pubmethodEquals(Object)

Determina si el objeto especificado es igual al objeto actual.(Heredado de Object).

System_CAPS_protmethodFinalize()

Permite que un objeto intente liberar recursos y realizar otras operaciones de limpieza antes de ser reclamado por el recolector de basura. (Heredado de Object).

System_CAPS_pubmethodGetHashCode()

Sirve como la función hash predeterminada.(Heredado de Object).

System_CAPS_pubmethodGetType()

Obtiene el Type de la instancia actual.(Heredado de Object).

System_CAPS_protmethodMemberwiseClone()

Crea una copia superficial del Object actual.(Heredado de Object).

System_CAPS_pubmethodToString()

Devuelve una cadena que representa al objeto actual. (Heredado de Object).

The E:System.Windows.Forms.ListView.DrawSubItem event enables you to customize (or owner-draw) the appearance of a T:System.Windows.Forms.ListView control in the details view.

The E:System.Windows.Forms.ListView.DrawSubItem event is raised by a T:System.Windows.Forms.ListView control when its P:System.Windows.Forms.ListView.OwnerDraw property is set to true and its P:System.Windows.Forms.ListView.View property is set to F:System.Windows.Forms.View.Details. The T:System.Windows.Forms.DrawListViewSubItemEventArgs passed to the event handler contains information about the T:System.Windows.Forms.ListViewItem.ListViewSubItem to draw and also provides methods to help you draw the subitem.

Use the P:System.Windows.Forms.DrawListViewSubItemEventArgs.ItemState or P:System.Windows.Forms.DrawListViewSubItemEventArgs.Item properties to retrieve information about the parent item of the subitem to draw. To retrieve the T:System.Windows.Forms.ListViewItem.ListViewSubItem itself, use the P:System.Windows.Forms.DrawListViewSubItemEventArgs.SubItem property. Use the P:System.Windows.Forms.DrawListViewSubItemEventArgs.Header property to retrieve the T:System.Windows.Forms.ColumnHeader representing the header of the column in which the subitem is displayed.

Use the P:System.Windows.Forms.DrawListViewSubItemEventArgs.Graphics property to do the actual drawing within the area specified by the P:System.Windows.Forms.DrawListViewSubItemEventArgs.Bounds property. To draw standard T:System.Windows.Forms.ListView elements that do not need customization, use the M:System.Windows.Forms.DrawListViewSubItemEventArgs.DrawBackground, Overload:System.Windows.Forms.DrawListViewSubItemEventArgs.DrawText, and M:System.Windows.Forms.DrawListViewSubItemEventArgs.DrawFocusRectangle(System.Drawing.Rectangle) methods.

Use the P:System.Windows.Forms.DrawListViewSubItemEventArgs.DrawDefault property when you want the operating system to draw the subitem. This is useful when you want to customize only specific subitems.

System_CAPS_noteNota

To avoid issues with graphics flickering when owner drawing, override the T:System.Windows.Forms.ListView control and set the P:System.Windows.Forms.ListView.DoubleBuffered property to true. This feature is available only on Windows XP and the Windows Server 2003 family when your application calls the M:System.Windows.Forms.Application.EnableVisualStyles method.

The following code example demonstrates how to provide custom drawing for a T:System.Windows.Forms.ListView control. The T:System.Windows.Forms.ListView control in the example has a gradient background. Subitems with negative values have a red foreground and a black background.

A handler for the E:System.Windows.Forms.ListView.DrawItem event draws the background for entire items. A handler for the E:System.Windows.Forms.ListView.DrawSubItem event draws the text values and both the text and background for subitems that have negative values. A handler for the E:System.Windows.Forms.ListView.DrawColumnHeader event draws each column header.

A T:System.Windows.Forms.ContextMenu component provides a way to switch between the details view and the list view. In the list view, only the E:System.Windows.Forms.ListView.DrawItem event is fired. In this case, the text and background are both drawn in the E:System.Windows.Forms.ListView.DrawItem event handler.

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Globalization;
using System.Windows.Forms;

public class ListViewOwnerDraw : Form
{
    private ListView listView1 = new ListView();
    private ContextMenu contextMenu1 = new ContextMenu();

    public ListViewOwnerDraw()
    {
        // Initialize the ListView control.
        listView1.BackColor = Color.Black;
        listView1.ForeColor = Color.White;
        listView1.Dock = DockStyle.Fill;
        listView1.View = View.Details;
        listView1.FullRowSelect = true;

        // Add columns to the ListView control.
        listView1.Columns.Add("Name", 100, HorizontalAlignment.Center);
        listView1.Columns.Add("First", 100, HorizontalAlignment.Center);
        listView1.Columns.Add("Second", 100, HorizontalAlignment.Center);
        listView1.Columns.Add("Third", 100, HorizontalAlignment.Center);

        // Create items and add them to the ListView control.
        ListViewItem listViewItem1 = new ListViewItem(new string[] { "One", "20", "30", "-40" }, -1);
        ListViewItem listViewItem2 = new ListViewItem(new string[] { "Two", "-250", "145", "37" }, -1);
        ListViewItem listViewItem3 = new ListViewItem(new string[] { "Three", "200", "800", "-1,001" }, -1);
        ListViewItem listViewItem4 = new ListViewItem(new string[] { "Four", "not available", "-2", "100" }, -1);
        listView1.Items.AddRange(new ListViewItem[] { listViewItem1, listViewItem2, listViewItem3, listViewItem4 });

        // Initialize the shortcut menu and 
        // assign it to the ListView control.
        contextMenu1.MenuItems.Add("List",
            new EventHandler(menuItemList_Click));
        contextMenu1.MenuItems.Add("Details",
            new EventHandler(menuItemDetails_Click));
        listView1.ContextMenu = contextMenu1;

        // Configure the ListView control for owner-draw and add 
        // handlers for the owner-draw events.
        listView1.OwnerDraw = true;
        listView1.DrawItem += new
            DrawListViewItemEventHandler(listView1_DrawItem);
        listView1.DrawSubItem += new
            DrawListViewSubItemEventHandler(listView1_DrawSubItem);
        listView1.DrawColumnHeader += new
            DrawListViewColumnHeaderEventHandler(listView1_DrawColumnHeader);

        // Add a handler for the MouseUp event so an item can be 
        // selected by clicking anywhere along its width.
        listView1.MouseUp += new MouseEventHandler(listView1_MouseUp);

        // Add handlers for various events to compensate for an 
        // extra DrawItem event that occurs the first time the mouse 
        // moves over each row. 
        listView1.MouseMove += new MouseEventHandler(listView1_MouseMove);
        listView1.ColumnWidthChanged += new ColumnWidthChangedEventHandler(listView1_ColumnWidthChanged);
        listView1.Invalidated += new InvalidateEventHandler(listView1_Invalidated);

        // Initialize the form and add the ListView control to it.
        this.ClientSize = new Size(450, 150);
        this.FormBorderStyle = FormBorderStyle.FixedSingle;
        this.MaximizeBox = false;
        this.Text = "ListView OwnerDraw Example";
        this.Controls.Add(listView1);
    }

    // Clean up any resources being used.        
    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            contextMenu1.Dispose();
        }
        base.Dispose(disposing);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new ListViewOwnerDraw());
    }

    // Sets the ListView control to the List view.
    private void menuItemList_Click(object sender, EventArgs e)
    {
        listView1.View = View.List;
        listView1.Invalidate();
    }

    // Sets the ListView control to the Details view.
    private void menuItemDetails_Click(object sender, EventArgs e)
    {
        listView1.View = View.Details;

        // Reset the tag on each item to re-enable the workaround in
        // the MouseMove event handler.
        foreach (ListViewItem item in listView1.Items)
        {
            item.Tag = null;
        }
    }

    // Selects and focuses an item when it is clicked anywhere along 
    // its width. The click must normally be on the parent item text.
    private void listView1_MouseUp(object sender, MouseEventArgs e)
    {
        ListViewItem clickedItem = listView1.GetItemAt(5, e.Y);
        if (clickedItem != null)
        {
            clickedItem.Selected = true;
            clickedItem.Focused = true;
        }
    }

    // Draws the backgrounds for entire ListView items.
    private void listView1_DrawItem(object sender,
        DrawListViewItemEventArgs e)
    {
        if ((e.State & ListViewItemStates.Selected) != 0)
        {
            // Draw the background and focus rectangle for a selected item.
            e.Graphics.FillRectangle(Brushes.Maroon, e.Bounds);
            e.DrawFocusRectangle();
        }
        else
        {
            // Draw the background for an unselected item.
            using (LinearGradientBrush brush =
                new LinearGradientBrush(e.Bounds, Color.Orange,
                Color.Maroon, LinearGradientMode.Horizontal))
            {
                e.Graphics.FillRectangle(brush, e.Bounds);
            }
        }

        // Draw the item text for views other than the Details view.
        if (listView1.View != View.Details)
        {
            e.DrawText();
        }
    }

    // Draws subitem text and applies content-based formatting.
    private void listView1_DrawSubItem(object sender,
        DrawListViewSubItemEventArgs e)
    {
        TextFormatFlags flags = TextFormatFlags.Left;

        using (StringFormat sf = new StringFormat())
        {
            // Store the column text alignment, letting it default
            // to Left if it has not been set to Center or Right.
            switch (e.Header.TextAlign)
            {
                case HorizontalAlignment.Center:
                    sf.Alignment = StringAlignment.Center;
                    flags = TextFormatFlags.HorizontalCenter;
                    break;
                case HorizontalAlignment.Right:
                    sf.Alignment = StringAlignment.Far;
                    flags = TextFormatFlags.Right;
                    break;
            }

            // Draw the text and background for a subitem with a 
            // negative value. 
            double subItemValue;
            if (e.ColumnIndex > 0 && Double.TryParse(
                e.SubItem.Text, NumberStyles.Currency,
                NumberFormatInfo.CurrentInfo, out subItemValue) &&
                subItemValue < 0)
            {
                // Unless the item is selected, draw the standard 
                // background to make it stand out from the gradient.
                if ((e.ItemState & ListViewItemStates.Selected) == 0)
                {
                    e.DrawBackground();
                }

                // Draw the subitem text in red to highlight it. 
                e.Graphics.DrawString(e.SubItem.Text,
                    listView1.Font, Brushes.Red, e.Bounds, sf);

                return;
            }

            // Draw normal text for a subitem with a nonnegative 
            // or nonnumerical value.
            e.DrawText(flags);
        }
    }

    // Draws column headers.
    private void listView1_DrawColumnHeader(object sender,
        DrawListViewColumnHeaderEventArgs e)
    {
        using (StringFormat sf = new StringFormat())
        {
            // Store the column text alignment, letting it default
            // to Left if it has not been set to Center or Right.
            switch (e.Header.TextAlign)
            {
                case HorizontalAlignment.Center:
                    sf.Alignment = StringAlignment.Center;
                    break;
                case HorizontalAlignment.Right:
                    sf.Alignment = StringAlignment.Far;
                    break;
            }

            // Draw the standard header background.
            e.DrawBackground();

            // Draw the header text.
            using (Font headerFont =
                        new Font("Helvetica", 10, FontStyle.Bold))
            {
                e.Graphics.DrawString(e.Header.Text, headerFont,
                    Brushes.Black, e.Bounds, sf);
            }
        }
        return;
    }

    // Forces each row to repaint itself the first time the mouse moves over 
    // it, compensating for an extra DrawItem event sent by the wrapped 
    // Win32 control. This issue occurs each time the ListView is invalidated.
    private void listView1_MouseMove(object sender, MouseEventArgs e)
    {
        ListViewItem item = listView1.GetItemAt(e.X, e.Y);
        if (item != null && item.Tag == null)
        {
            listView1.Invalidate(item.Bounds);
            item.Tag = "tagged";
        }
    }

    // Resets the item tags. 
    void listView1_Invalidated(object sender, InvalidateEventArgs e)
    {
        foreach (ListViewItem item in listView1.Items)
        {
            if (item == null) return;
            item.Tag = null;
        }
    }

    // Forces the entire control to repaint if a column width is changed.
    void listView1_ColumnWidthChanged(object sender, 
        ColumnWidthChangedEventArgs e)
    {
        listView1.Invalidate();
    }

}

.NET Framework
Disponible desde 2.0

Cualquier miembro ( Compartido en Visual Basic) estático público de este tipo es seguro para subprocesos. No se garantiza que los miembros de instancia sean seguros para subprocesos.

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