Flatten Form Fields

Product Version Product Author
2020.1.316 RadPdfProcessing Martin Velikov

Description

How to flatten Form Fields.

Solution

This could be achieved by iterating the RadFixedPage`s Annotations and if the type of the annotation is Widget to flatten its appearance.

public static void FlattenFormFields(RadFixedDocument document) 
{ 
    foreach (RadFixedPage page in document.Pages) 
    { 
        List<Widget> widgetsToRemove = new List<Widget>(); 
        FixedContentEditor pageEditor = new FixedContentEditor(page); 
 
        foreach (Annotation annotation in page.Annotations) 
        { 
            if (annotation.Type == AnnotationType.Widget) 
            { 
                Widget widget = (Widget)annotation; 
                FlattenWidgetAppearance(pageEditor, widget); 
                widgetsToRemove.Add(widget); 
            } 
        } 
 
        foreach (Widget widget in widgetsToRemove) 
        { 
            page.Annotations.Remove(widget); 
        } 
    } 
 
    foreach (FormField field in document.AcroForm.FormFields.ToArray()) 
    { 
        document.AcroForm.FormFields.Remove(field); 
    } 
} 
 
private static void FlattenWidgetAppearance(FixedContentEditor pageEditor, Widget widget) 
{ 
    FormSource widgetAppearance = GetWidgetNormalAppearance(widget); 
    pageEditor.Position.Translate(widget.Rect.Left, widget.Rect.Top); 
    pageEditor.DrawForm(widgetAppearance, widget.Rect.Width, widget.Rect.Height); 
} 
 
private static FormSource GetWidgetNormalAppearance(Widget widget) 
{ 
    FormSource widgetAppearance; 
    switch (widget.WidgetContentType) 
    { 
        case WidgetContentType.PushButtonContent: 
            widgetAppearance = ((PushButtonWidget)widget).Content.NormalContentSource; 
            break; 
        case WidgetContentType.SignatureContent: 
            widgetAppearance = ((SignatureWidget)widget).Content.NormalContentSource; 
            break; 
        case WidgetContentType.VariableContent: 
            widgetAppearance = ((VariableContentWidget)widget).Content.NormalContentSource; 
            break; 
        case WidgetContentType.TwoStatesContent: 
            TwoStatesButtonWidget twoStatesWidget = (TwoStatesButtonWidget)widget; 
            widgetAppearance = GetTwoStatesWidgetNormalAppearance(twoStatesWidget); 
            break; 
        default: 
            throw new NotSupportedException(string.Format("Not supported widget content type {0}", widget.WidgetContentType)); 
    } 
 
    return widgetAppearance; 
} 
 
private static FormSource GetTwoStatesWidgetNormalAppearance(TwoStatesButtonWidget twoStatesWidget) 
{ 
    FormField field = twoStatesWidget.Field; 
    bool isOnState; 
 
    switch (field.FieldType) 
    { 
        case FormFieldType.CheckBox: 
            CheckBoxField checkBox = (CheckBoxField)field; 
            isOnState = checkBox.IsChecked; 
            break; 
        case FormFieldType.RadioButton: 
            RadioButtonField radio = (RadioButtonField)field; 
            RadioButtonWidget radioWidget = (RadioButtonWidget)twoStatesWidget; 
 
            if (radio.ShouldUpdateRadiosInUnison) 
            { 
                isOnState = radio.Value != null && radio.Value.Value.Equals(radioWidget.Option.Value); 
            } 
            else 
            { 
                isOnState = radio.Value == radioWidget.Option; 
            } 
            break; 
        default: 
            throw new NotSupportedException(string.Format("Not supported field type {0} for TwoStateButtonWidget", field.FieldType)); 
    } 
 
    FormSource widgetAppearance = (isOnState ? twoStatesWidget.OnStateContent : twoStatesWidget.OffStateContent).NormalContentSource; 
 
    return widgetAppearance; 
} 
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