PdfGraphicsAcroFormComboBoxField Class

A combo box field in PDF Graphics API.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v23.1.Drawing.dll

NuGet Package: DevExpress.Pdf.Drawing

Declaration

C#

public class PdfGraphicsAcroFormComboBoxField :
    PdfGraphicsAcroFormChoiceField

VB.NET

Public Class PdfGraphicsAcroFormComboBoxField
    Inherits PdfGraphicsAcroFormChoiceField

Related API Members

The following members return PdfGraphicsAcroFormComboBoxField objects:

• PdfGraphicsAcroFormField.CreateComboBox(String, RectangleF)

Remarks

To access the PdfGraphicsAcroFormComboBoxField class, reference the DevExpress.Pdf.Drawing.v23.1 assembly.

Tip

You can use the PdfAcroFormField class to add interactive form fields to a PDF file. Refer to the following article for more information: Interactive Forms in PDF Documents

Create a Combo Box Form Field

Create a new PdfGraphicsAcroFormComboBoxField object, and pass the field name and location as the constructor parameters.

You can also call the PdfGraphicsAcroFormField.CreateComboBox method to create a combo box field. The page location is calculated in the world coordinate system.

To add values to a combo box, call one of the AddValue overloaded methods.

Specify Form Field Parameters

The following parameters are available:

Parameter	API
Form field name	Name
Tooltip text	ToolTip
Selected item (by index)	SetSelected(Int32, Boolean)
Selected item (by export value)	SelectValue(String)
Appearance settings (background and foreground color, font and border options)	Appearance

Add a Form Field as Graphics Content

To add a combo box field as graphics content, pass a PdfGraphicsAcroFormComboBoxField object as a parameter to the PdfGraphics.AddFormField method.

Draw a Form Field on a Page

To add an interactive field to a page, call one of the following methods:

• PdfGraphics.AddToPageForeground, PdfGraphics.AddToPageBackground – to add a field to an existing page;
• PdfDocumentProcessor.RenderNewPage – to add a field to a new page.

Example

This example shows how to use PDF Graphics API to create a combo box field and add it to a PDF page.

View Example

Program.cs

using DevExpress.Pdf;
using System.Drawing;
//...


static void Main(string[] args)
{
    using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
    {
        // Create an empty document. 
        processor.CreateEmptyDocument("..\\..\\Result.pdf");

        // Create graphics and draw a combo box field.
        using (PdfGraphics graphics = processor.CreateGraphics())
        {
            DrawComboBoxField(graphics);

            // Render a page with graphics.
            processor.RenderNewPage(PdfPaperSize.Letter, graphics);
        }
    }
}

static void DrawComboBoxField(PdfGraphics graphics)
{
    // Create a combo box field
    PdfGraphicsAcroFormComboBoxField comboBox = 
        new PdfGraphicsAcroFormComboBoxField("combo Box", new RectangleF(20, 20, 100, 20));

    // Add values to the combo box.  
    comboBox.AddValue("Red");
    comboBox.AddValue("Yellow");
    comboBox.AddValue("Green");
    comboBox.AddValue("Blue");

    // Specify combo box selected value, text alignment, and appearance.
    comboBox.SelectValue("Red");
    comboBox.TextAlignment = PdfAcroFormStringAlignment.Far;
    comboBox.Appearance.BackgroundColor = Color.Beige;
    comboBox.Appearance.FontSize = 14;

    // Add the field to the document.
    graphics.AddFormField(comboBox);
}

Program.vb

Imports DevExpress.Pdf
Imports System.Drawing
'...


Shared Sub Main(ByVal args() As String)
    Using processor As New PdfDocumentProcessor()

        ' Create an empty document. 
        processor.CreateEmptyDocument("..\..\Result.pdf")

        ' Create graphics and draw a combo box field.
        Using graphics As PdfGraphics = processor.CreateGraphics()
            DrawComboBoxField(graphics)

            ' Render a page with graphics.
            processor.RenderNewPage(PdfPaperSize.Letter, graphics)
        End Using
    End Using
End Sub

Private Shared Sub DrawComboBoxField(ByVal graphics As PdfGraphics)

    ' Create a combo box field
    Dim comboBox As New PdfGraphicsAcroFormComboBoxField("combo Box", New RectangleF(20, 20, 100, 20))

    ' Add values to the combo box.  
    comboBox.AddValue("Red")
    comboBox.AddValue("Yellow")
    comboBox.AddValue("Green")
    comboBox.AddValue("Blue")

    ' Specify combo box selected value, text alignment, and appearance.
    comboBox.SelectValue("Red")
    comboBox.TextAlignment = PdfAcroFormStringAlignment.Far
    comboBox.Appearance.BackgroundColor = Color.Beige
    comboBox.Appearance.FontSize = 14

    ' Add the field to the document.
    graphics.AddFormField(comboBox)
End Sub

Inheritance

Object

PdfGraphicsAcroFormField

PdfGraphicsAcroFormCommonField

PdfGraphicsAcroFormChoiceField

PdfGraphicsAcroFormComboBoxField