Draw (Evento)
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ToolTip.Draw (Evento)

Se produce cuando se dibuja la información sobre herramientas y la propiedad OwnerDraw se establece en true.

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

public event DrawToolTipEventHandler Draw
/** @event */
public void add_Draw (DrawToolTipEventHandler value)

/** @event */
public void remove_Draw (DrawToolTipEventHandler value)

En JScript, se pueden controlar los eventos que define una clase, pero no se pueden definir unos propios.
No aplicable.

Con el evento Draw, puede personalizar el aspecto de la ToolTip.

La clase ToolTip provoca el evento Draw cuando se dibuja ToolTip y el valor de la propiedad ToolTip.OwnerDraw es true. La clase DrawToolTipEventArgs contiene toda la información necesaria para dibujar la ToolTip, incluido el texto de la información sobre herramientas, el objeto Rectangle y el objeto Graphics sobre el que se hará el dibujo. Para personalizar el aspecto de la información sobre herramientas, use el objeto Rectangle para determinara los límites de la información y el objeto Graphics para realizar su dibujo personalizado. Puede aumentar los límites del objeto ToolTip antes de que se muestre controlando el evento Popup.

Para obtener más información sobre control de eventos, vea Utilizar eventos.

En el ejemplo de código siguiente se muestra cómo dibujar de forma personalizada la ToolTip. En el ejemplo se crea ToolTip y se asocia a tres controles Button situados en Form. En el ejemplo se establece la propiedad OwnerDraw en true y se controla el evento Draw. En el controlador de eventos Draw, ToolTip se dibuja de forma personalizada dependiendo del botón para el que se va a mostrar ToolTip según indica la propiedad DrawToolTipEventArgs.AssociatedControl.

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;

namespace ToolTipExample
{
    // Form for the ToolTip example.
    public class ToolTipExampleForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ToolTip toolTip1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button3;

        public ToolTipExampleForm()
        {
            // Create the ToolTip and set initial values.
            this.toolTip1 = new System.Windows.Forms.ToolTip();
            this.toolTip1.AutoPopDelay = 5000;
            this.toolTip1.InitialDelay = 500;
            this.toolTip1.OwnerDraw = true;
            this.toolTip1.ReshowDelay = 10;
            this.toolTip1.Draw += new DrawToolTipEventHandler(this.toolTip1_Draw);
            this.toolTip1.Popup += new PopupEventHandler(toolTip1_Popup);

            // Create button1 and set initial values.
            this.button1 = new System.Windows.Forms.Button();
            this.button1.Location = new System.Drawing.Point(8, 8);
            this.button1.Text = "Button 1";
            this.toolTip1.SetToolTip(this.button1, "Button1 tip text");

            // Create button2 and set initial values.
            this.button2 = new System.Windows.Forms.Button();
            this.button2.Location = new System.Drawing.Point(8, 32);
            this.button2.Text = "Button 2";
            this.toolTip1.SetToolTip(this.button2, "Button2 tip text");

            // Create button3 and set initial values.
            this.button3 = new System.Windows.Forms.Button();
            this.button3.Location = new System.Drawing.Point(8, 56);
            this.button3.Text = "Button 3";
            this.toolTip1.SetToolTip(this.button3, "Button3 tip text");

            // Set up the Form.
            this.Controls.AddRange(new Control[] {
                this.button1, this.button2, this.button3
            });
            this.Text = "owner drawn ToolTip example";
        }

        // Clean up any resources being used.        
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                toolTip1.Dispose();
            }

            base.Dispose(disposing);
        }

        // The main entry point for the application.
        [STAThread]
        static void Main()
        {
            Application.Run(new ToolTipExampleForm());
        }

        // Determines the correct size for the button2 ToolTip.
        private void toolTip1_Popup(object sender, PopupEventArgs e)
        {
            if (e.AssociatedControl == button2)
            {
                using (Font f = new Font("Tahoma", 9))
                {
                    e.ToolTipSize = TextRenderer.MeasureText(
                        toolTip1.GetToolTip(e.AssociatedControl), f);
                }
            }
        }

        // Handles drawing the ToolTip.
        private void toolTip1_Draw(System.Object sender, 
            System.Windows.Forms.DrawToolTipEventArgs e)
        {
            // Draw the ToolTip differently depending on which 
            // control this ToolTip is for.
            // Draw a custom 3D border if the ToolTip is for button1.
            if (e.AssociatedControl == button1)
            {
                // Draw the standard background.
                e.DrawBackground();

                // Draw the custom border to appear 3-dimensional.
                e.Graphics.DrawLines(SystemPens.ControlLightLight, new Point[] {
                    new Point (0, e.Bounds.Height - 1), 
                    new Point (0, 0), 
                    new Point (e.Bounds.Width - 1, 0)
                });
                e.Graphics.DrawLines(SystemPens.ControlDarkDark, new Point[] {
                    new Point (0, e.Bounds.Height - 1), 
                    new Point (e.Bounds.Width - 1, e.Bounds.Height - 1), 
                    new Point (e.Bounds.Width - 1, 0)
                });

                // Specify custom text formatting flags.
                TextFormatFlags sf = TextFormatFlags.VerticalCenter |
                                     TextFormatFlags.HorizontalCenter |
                                     TextFormatFlags.NoFullWidthCharacterBreak;

                // Draw the standard text with customized formatting options.
                e.DrawText(sf);
            }
            // Draw a custom background and text if the ToolTip is for button2.
            else if (e.AssociatedControl == button2)
            {
                // Draw the custom background.
                e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, e.Bounds);

                // Draw the standard border.
                e.DrawBorder();

                // Draw the custom text.
                // The using block will dispose the StringFormat automatically.
                using (StringFormat sf = new StringFormat())
                {
                    sf.Alignment = StringAlignment.Center;
                    sf.LineAlignment = StringAlignment.Center;
                    sf.HotkeyPrefix = System.Drawing.Text.HotkeyPrefix.None;
                    sf.FormatFlags = StringFormatFlags.NoWrap;
                    using (Font f = new Font("Tahoma", 9))
                    {
                        e.Graphics.DrawString(e.ToolTipText, f, 
                            SystemBrushes.ActiveCaptionText, e.Bounds, sf);
                    }
                }
            }
            // Draw the ToolTip using default values if the ToolTip is for button3.
            else if (e.AssociatedControl == button3)
            {
                e.DrawBackground();
                e.DrawBorder();
                e.DrawText();
            }
        }
    }
}

package ToolTipExample;

import System.*;
import System.Drawing.*;
import System.Drawing.GDI.*;
import System.Windows.Forms.*;
import System.Windows.Forms.VisualStyles.*;

// Form for the ToolTip example.
public class ToolTipExampleForm extends System.Windows.Forms.Form
{
    private System.Windows.Forms.ToolTip toolTip1;
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.Button button3;

    public ToolTipExampleForm()
    {
        // Create the ToolTip and set initial values.
        this.toolTip1 = new System.Windows.Forms.ToolTip();
        this.toolTip1.set_AutoPopDelay(5000);
        this.toolTip1.set_InitialDelay(500);
        this.toolTip1.set_OwnerDraw(true);
        this.toolTip1.set_ReshowDelay(10);
        this.toolTip1.add_Draw(new DrawToolTipEventHandler(this.toolTip1_Draw));
        // Create button1 and set initial values.
        this.button1 = new System.Windows.Forms.Button();
        this.button1.set_Location(new System.Drawing.Point(8, 8));
        this.button1.set_Text("Button 1");
        this.toolTip1.SetToolTip(this.button1, "Button1 tip text");
        // Create button2 and set initial values.
        this.button2 = new System.Windows.Forms.Button();
        this.button2.set_Location(new System.Drawing.Point(8, 32));
        this.button2.set_Text("Button 2");
        this.toolTip1.SetToolTip(this.button2, "Button2 tip text");
        // Create button3 and set initial values.
        this.button3 = new System.Windows.Forms.Button();
        this.button3.set_Location(new System.Drawing.Point(8, 56));
        this.button3.set_Text("Button 3");
        this.toolTip1.SetToolTip(this.button3, "Button3 tip text");
        // Set up the Form.
        this.get_Controls().AddRange(new Control[]
            { this.button1, this.button2, this.button3 });
        this.set_Text("owner drawn ToolTip example");
    } //ToolTipExampleForm

    // Clean up any resources being used.        
    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            toolTip1.Dispose();
        }
        super.Dispose(disposing);
    } //Dispose

    // The main entry point for the application.
    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new ToolTipExampleForm());
    } //main

    // Handles drawing the ToolTip.
    private void toolTip1_Draw(Object sender,
        System.Windows.Forms.DrawToolTipEventArgs e)
    {
        // Draw the ToolTip differently depending on which 
        // control this ToolTip is for.
        // Draw a custom 3D border if the ToolTip is for button1.
        if (e.get_AssociatedControl().Equals(button1)) {
            // Draw the standard background.
            e.DrawBackground();
            // Draw the custom border to appear 3-dimensional.
            e.get_Graphics().DrawLines(SystemPens.get_ControlLightLight(),
                new Point[] { new Point(0, e.get_Bounds().get_Height() - 1),
                new Point(0, 0), new Point(e.get_Bounds().get_Width() - 1, 0)});
            e.get_Graphics().DrawLines(SystemPens.get_ControlDarkDark(),
                new Point[] { new Point(0, e.get_Bounds().get_Height() - 1),
                new Point(e.get_Bounds().get_Width() - 1,
                e.get_Bounds().get_Height() - 1),
                new Point(e.get_Bounds().get_Width() - 1, 0) });
            // Specify custom text formatting flags.
            TextFormatFlags sf = TextFormatFlags.VerticalCenter
                | TextFormatFlags.HorizontalCenter
                | TextFormatFlags.NoFullWidthCharacterBreak;
            // Draw the standard text with customized formatting options.
            e.DrawText(sf);
        }
        // Draw a custom background and text if the ToolTip is for button2.
        else {
            if (e.get_AssociatedControl().Equals(button2)) {
                // Draw the custom background.
                e.get_Graphics().FillRectangle(SystemBrushes.get_ActiveCaption(),
                    e.get_Bounds());
                // Draw the standard border.
                e.DrawBorder();
                
                // Draw the custom text.
                // The using block will dispose the StringFormat automatically.
                StringFormat sf = new StringFormat();
                try {
                    sf.set_Alignment(StringAlignment.Center);
                    sf.set_LineAlignment(StringAlignment.Center);
                    sf.set_HotkeyPrefix(System.Drawing.Text.HotkeyPrefix.None);
                    sf.set_FormatFlags(StringFormatFlags.NoWrap);                    
                    Font f = new Font("Tahoma", 9);
                    try {
                        e.get_Graphics().DrawString(e.get_ToolTipText(), f,
                            SystemBrushes.get_ActiveCaptionText(),
                            RectangleF.op_Implicit(e.get_Bounds()), sf);
                    }
                    finally {
                        f.Dispose();
                    }                    
                }
                finally {
                    sf.Dispose();
                }                
            }
            // Draw the ToolTip using default values if the ToolTip is
            // for button3.
            else {
                if (e.get_AssociatedControl().Equals(button3)) {
                    e.DrawBackground();
                    e.DrawBorder();
                    e.DrawText();
                }
            }
        }        
    } //toolTip1_Draw
} //ToolTipExampleForm

Windows 98, Windows 2000 Service Pack 4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter

Microsoft .NET Framework 3.0 es compatible con Windows Vista, Microsoft Windows XP SP2 y Windows Server 2003 SP1.

.NET Framework

Compatible con: 3.0, 2.0
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