TextBoxRenderer Clase

Definición

Proporciona métodos para representar un control de cuadro de texto con estilos visuales.Provides methods used to render a text box control with visual styles. Esta clase no puede heredarse.This class cannot be inherited.

public ref class TextBoxRenderer sealed
public sealed class TextBoxRenderer
type TextBoxRenderer = class
Public NotInheritable Class TextBoxRenderer
Herencia
TextBoxRenderer

Ejemplos

En el ejemplo de código siguiente se muestra cómo crear un control personalizado que DrawTextBox utiliza el método para dibujar un cuadro de texto.The following code example demonstrates how to create a custom control that uses the DrawTextBox method to draw a text box. El control también permite al usuario seleccionar uno de los TextFormatFlags valores que se van a aplicar al texto del cuadro de texto.The control also allows the user to select one of the TextFormatFlags values to apply to the text box text.

#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>

using namespace System;
using namespace System::Text;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::VisualStyles;

namespace TextBoxRendererSample
{
    public ref class CustomTextBox : public Control
    {
    private:
        TextFormatFlags textFlags;
        ComboBox^ textFormatFlagsComboBox;
        Rectangle textBorder;
        Rectangle textRectangle;
        StringBuilder^ textMeasurements;

    public:
        CustomTextBox():Control()
        {
            textFlags = TextFormatFlags::Default;
            textFormatFlagsComboBox = gcnew ComboBox();

            textMeasurements = gcnew StringBuilder();

            this->Location = Point(10, 10);
            this->Size = System::Drawing::Size(300, 200);
            this->Font = SystemFonts::IconTitleFont;
            this->Text = "This is a long sentence that will exceed " +
                "the text box bounds";

            textBorder.Location = Point(10, 10);
            textBorder.Size = System::Drawing::Size(200, 50);
            textRectangle.Location = Point(textBorder.X + 2,
                textBorder.Y + 2);
            textRectangle.Size =  System::Drawing::Size(textBorder.Size.Width - 4,
                textBorder.Height - 4);

            textFormatFlagsComboBox->Location = Point(10, 100);
            textFormatFlagsComboBox->Size = System::Drawing::Size(150, 20);
            textFormatFlagsComboBox->SelectedIndexChanged +=
                gcnew EventHandler(this, 
                &CustomTextBox::textFormatFlagsComboBox_SelectedIndexChanged);

            // Populate the combo box with the TextFormatFlags value names.
            for each (String^ name in Enum::GetNames(TextFormatFlags::typeid))
            {
                textFormatFlagsComboBox->Items->Add(name);
            }

            textFormatFlagsComboBox->SelectedIndex = 0;
            this->Controls->Add(textFormatFlagsComboBox);
        }

        // Use DrawText with the current TextFormatFlags.

    protected:
        virtual void OnPaint(PaintEventArgs^ e) override
        {
            __super::OnPaint(e);

            if (TextBoxRenderer::IsSupported)
            {
                TextBoxRenderer::DrawTextBox(e->Graphics, textBorder, this->Text,
                    this->Font, textRectangle, textFlags, TextBoxState::Normal);

                this->Parent->Text = "CustomTextBox Enabled";
            }
            else
            {
                this->Parent->Text = "CustomTextBox Disabled";
            }
        }

        // Assign the combo box selection to the display text.
    private:
        void textFormatFlagsComboBox_SelectedIndexChanged(
            Object^ sender, EventArgs^ e)
        {
            this->textFlags = (TextFormatFlags)Enum::Parse(
                TextFormatFlags::typeid,
                (String^)textFormatFlagsComboBox->Items[
                    textFormatFlagsComboBox->SelectedIndex]);

                    Invalidate();
        }
    };

    public ref class Form1 : public Form
    {
    public:
        Form1()
        {
            __super::Form();
            this->Size = System::Drawing::Size(350, 200);
            CustomTextBox^ textBox1 = gcnew CustomTextBox();
            Controls->Add(textBox1);
        }
    };
}

using namespace TextBoxRendererSample;

[STAThread]
int main()
{     
    // The call to EnableVisualStyles below does not affect whether 
    // TextBoxRenderer draws the text box; as long as visual styles 
    // are enabled by the operating system, TextBoxRenderer will 
    // draw the text box.
    Application::EnableVisualStyles();
    Application::Run(gcnew Form1());
}

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

namespace TextBoxRendererSample
{
    class Form1 : Form
    {
        public Form1()
            : base()
        {
            this.Size = new Size(350, 200);
            CustomTextBox TextBox1 = new CustomTextBox();
            Controls.Add(TextBox1);
        }

        [STAThread]
        static void Main()
        {
            // The call to EnableVisualStyles below does not affect whether 
            // TextBoxRenderer draws the text box; as long as visual styles 
            // are enabled by the operating system, TextBoxRenderer will 
            // draw the text box.
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }
    }

    public class CustomTextBox : Control
    {
        private TextFormatFlags textFlags = TextFormatFlags.Default;
        ComboBox comboBox1 = new ComboBox();
        Rectangle textBorder = new Rectangle();
        Rectangle textRectangle = new Rectangle();
        StringBuilder textMeasurements = new StringBuilder();

        public CustomTextBox()
            : base()
        {
            this.Location = new Point(10, 10);
            this.Size = new Size(300, 200);
            this.Font = SystemFonts.IconTitleFont;
            this.Text = "This is a long sentence that will exceed " +
                "the text box bounds";

            textBorder.Location = new Point(10, 10);
            textBorder.Size = new Size(200, 50);
            textRectangle.Location = new Point(textBorder.X + 2,
                textBorder.Y + 2);
            textRectangle.Size = new Size(textBorder.Size.Width - 4,
                textBorder.Height - 4);

            comboBox1.Location = new Point(10, 100);
            comboBox1.Size = new Size(150, 20);
            comboBox1.SelectedIndexChanged +=
                new EventHandler(comboBox1_SelectedIndexChanged);

            // Populate the combo box with the TextFormatFlags value names.
            foreach (string name in Enum.GetNames(typeof(TextFormatFlags)))
            {
                comboBox1.Items.Add(name);
            }

            comboBox1.SelectedIndex = 0;
            this.Controls.Add(comboBox1);
        }

        // Use DrawText with the current TextFormatFlags.
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            if (TextBoxRenderer.IsSupported)
            {
                TextBoxRenderer.DrawTextBox(e.Graphics, textBorder, this.Text,
                    this.Font, textRectangle, textFlags, TextBoxState.Normal);

                this.Parent.Text = "CustomTextBox Enabled";
            }
            else
            {
                this.Parent.Text = "CustomTextBox Disabled";
            }
        }

        // Assign the combo box selection to the display text.
        void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.textFlags = (TextFormatFlags)Enum.Parse(
                typeof(TextFormatFlags),
                (string)comboBox1.Items[comboBox1.SelectedIndex]);
            Invalidate();
        }
    }
}
Imports System.Text
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles

Namespace TextBoxRendererSample

    Class Form1
        Inherits Form

        Public Sub New()
            Me.Size = New Size(350, 200)
            Dim TextBox1 As New CustomTextBox()
            Controls.Add(TextBox1)
        End Sub

        <STAThread()> _
        Shared Sub Main()
            ' The call to EnableVisualStyles below does not affect whether 
            ' TextBoxRenderer draws the text box; as long as visual styles 
            ' are enabled by the operating system, TextBoxRenderer will 
            ' draw the text box.
            Application.EnableVisualStyles()
            Application.Run(New Form1())
        End Sub
    End Class

    Public Class CustomTextBox
        Inherits Control

        Private textFlags As TextFormatFlags = TextFormatFlags.Default
        Private WithEvents comboBox1 As New ComboBox()
        Private textBorder As New Rectangle()
        Private textRectangle As New Rectangle()
        Private textMeasurements As New StringBuilder()

        Public Sub New()

            With Me
                .Location = New Point(10, 10)
                .Size = New Size(300, 200)
                .Font = SystemFonts.IconTitleFont
                .Text = "This is a long sentence that will exceed " + _
                    "the text box bounds"
            End With

            textBorder.Location = New Point(10, 10)
            textBorder.Size = New Size(200, 50)
            textRectangle.Location = New Point(textBorder.X + 2, _
                textBorder.Y + 2)
            textRectangle.Size = New Size(textBorder.Size.Width - 4, _
                textBorder.Height - 4)

            comboBox1.Location = New Point(10, 100)
            comboBox1.Size = New Size(150, 20)

            ' Populate the combo box with the TextFormatFlags value names.
            Dim name As String
            For Each name In [Enum].GetNames(GetType(TextFormatFlags))
                comboBox1.Items.Add(name)
            Next name

            comboBox1.SelectedIndex = 0
            Me.Controls.Add(comboBox1)
        End Sub

        ' Use DrawText with the current TextFormatFlags.
        Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
            MyBase.OnPaint(e)

            If TextBoxRenderer.IsSupported Then
                TextBoxRenderer.DrawTextBox(e.Graphics, textBorder, Me.Text, _
                    Me.Font, textRectangle, textFlags, TextBoxState.Normal)
                Me.Parent.Text = "CustomTextBox Enabled"
            Else
                Me.Parent.Text = "CustomTextBox Disabled"
            End If
        End Sub

        ' Assign the combo box selection to the display text.
        Private Sub comboBox1_SelectedIndexChanged(ByVal sender As Object, _
            ByVal e As EventArgs) Handles comboBox1.SelectedIndexChanged

            Me.textFlags = CType([Enum].Parse(GetType(TextFormatFlags), _
                CStr(comboBox1.Items(comboBox1.SelectedIndex))), _
                TextFormatFlags)
            Invalidate()
        End Sub

    End Class
End Namespace

Comentarios

La TextBoxRenderer clase proporciona un conjunto de static métodos que se pueden utilizar para representar un control de cuadro de texto con el estilo visual actual del sistema operativo.The TextBoxRenderer class provides a set of static methods that can be used to render a text box control with the current visual style of the operating system. La representación de un control hace referencia al hecho de dibujar la interfaz de usuario de un control.Rendering a control refers to drawing the user interface of a control. Esto resulta útil si está dibujando un control personalizado que debería tener la apariencia del estilo visual actual.This is useful if you are drawing a custom control that should have the appearance of the current visual style. Para dibujar un cuadro de texto, use uno de DrawTextBox los métodos.To draw a text box, use one of the DrawTextBox methods. Estos métodos proporcionan una variedad de opciones, como la aplicación de formato de texto o la especificación de los límites de texto.These methods provide a variety of options, such as applying text formatting or specifying text bounds.

Si los estilos visuales están habilitados en el sistema operativo y los estilos visuales se aplican al área cliente de DrawTextBox las ventanas de la aplicación, dibujará el cuadro de texto con el estilo visual actual.If visual styles are enabled in the operating system and visual styles are applied to the client area of application windows, DrawTextBox will draw the text box with the current visual style. De lo DrawTextBox contrario, producirá una excepción. InvalidOperationExceptionOtherwise, DrawTextBox will throw an InvalidOperationException. Para determinar si se pueden usar los miembros de esta clase, puede comprobar el valor de la IsSupported propiedad.To determine whether the members of this class can be used, you can check the value of the IsSupported property.

Esta clase encapsula la funcionalidad de un System.Windows.Forms.VisualStyles.VisualStyleRenderer que se establece en uno de los elementos de la System.Windows.Forms.VisualStyles.VisualStyleElement.TextBox.TextEdit clase.This class wraps the functionality of a System.Windows.Forms.VisualStyles.VisualStyleRenderer that is set to one of the elements of the System.Windows.Forms.VisualStyles.VisualStyleElement.TextBox.TextEdit class. Para obtener más información, consulte Representar controles con estilos visuales.For more information, see Rendering Controls with Visual Styles.

Propiedades

IsSupported

Obtiene un valor que indica si la clase TextBoxRenderer puede utilizarse para dibujar un cuadro de texto con estilos visuales.Gets a value indicating whether the TextBoxRenderer class can be used to draw a text box with visual styles.

Métodos

DrawTextBox(Graphics, Rectangle, String, Font, Rectangle, TextBoxState)

Dibuja un control de cuadro de texto en el estado y los límites especificados, y con el texto y los límites de texto especificados.Draws a text box control in the specified state and bounds, and with the specified text and text bounds.

DrawTextBox(Graphics, Rectangle, String, Font, Rectangle, TextFormatFlags, TextBoxState)

Dibuja un control de cuadro de texto en el estado y los límites especificados, y con el texto, los límites de texto y el formato de texto especificados.Draws a text box control in the specified state and bounds, and with the specified text, text bounds, and text formatting.

DrawTextBox(Graphics, Rectangle, String, Font, TextBoxState)

Dibuja un control de cuadro de texto en el estado y los límites especificados, y con el texto especificado.Draws a text box control in the specified state and bounds, and with the specified text.

DrawTextBox(Graphics, Rectangle, String, Font, TextFormatFlags, TextBoxState)

Dibuja un control de cuadro de texto en el estado y los límites especificados, y con el texto y el formato de texto especificados.Draws a text box control in the specified state and bounds, and with the specified text and text formatting.

DrawTextBox(Graphics, Rectangle, TextBoxState)

Dibuja un control de cuadro de texto en el estado y los límites especificados.Draws a text box control in the specified state and bounds.

Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

(Heredado de Object)
GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

(Heredado de Object)
GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

(Heredado de Object)
MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

(Heredado de Object)
ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Heredado de Object)

Se aplica a

Consulte también: