/// <summary>Attempts to determine which type of field a PdfDictionary represents</summary>
/// <param name="dict"></param>
/// <returns></returns>
public static PdfAcroFieldType DetermineFieldType(PdfDictionary dict)
{
if (!dict.Elements.ContainsKey(Keys.FT))
{
return(PdfAcroFieldType.Unknown);
}
string ft = dict.Elements.GetName(Keys.FT);
PdfAcroFieldFlags flags = (PdfAcroFieldFlags)dict.Elements.GetInteger(Keys.Ff);
switch (ft)
{
case "/Btn":
if ((flags & PdfAcroFieldFlags.Pushbutton) != 0)
{
return(PdfAcroFieldType.PushButton);
}
if ((flags & PdfAcroFieldFlags.Radio) != 0)
{
return(PdfAcroFieldType.RadioButton);
}
return(PdfAcroFieldType.CheckBox);
case "/Tx":
return(PdfAcroFieldType.Text);
case "/Ch":
if ((flags & PdfAcroFieldFlags.Combo) != 0)
{
return(PdfAcroFieldType.ComboBox);
}
else
{
return(PdfAcroFieldType.ListBox);
}
case "/Sig":
return(PdfAcroFieldType.Signature);
default:
return(PdfAcroFieldType.Unknown);
}
}
/// <summary>
/// Create a derived type like PdfTextField or PdfCheckBox if possible.
/// If the actual cannot be guessed by PDFsharp the function returns an instance
/// of PdfGenericField.
/// </summary>
PdfAcroField CreateAcroField(PdfDictionary dict)
{
string ft = dict.Elements.GetName(Keys.FT);
PdfAcroFieldFlags flags = (PdfAcroFieldFlags)dict.Elements.GetInteger(Keys.Ff);
switch (ft)
{
case "/Btn":
if ((flags & PdfAcroFieldFlags.Pushbutton) != 0)
{
return(new PdfPushButtonField(dict));
}
else if ((flags & PdfAcroFieldFlags.Radio) != 0)
{
return(new PdfRadioButtonField(dict));
}
else
{
return(new PdfCheckBoxField(dict));
}
case "/Tx":
return(new PdfTextField(dict));
case "/Ch":
if ((flags & PdfAcroFieldFlags.Combo) != 0)
{
return(new PdfComboBoxField(dict));
}
else
{
return(new PdfListBoxField(dict));
}
case "/Sig":
return(new PdfSignatureField(dict));
default:
return(new PdfGenericField(dict));
}
}
internal static PdfAcroField CheckBoxMaybeRadioButton(PdfDictionary dict, PdfAcroFieldFlags flags)
{
if ((flags & PdfAcroFieldFlags.Radio) != 0) // explicitly given type
{
return(new PdfRadioButtonField(dict));
}
if ((flags & PdfAcroFieldFlags.RadiosInUnison) != 0) // this flag is only valid for radio buttons
{
return(new PdfRadioButtonField(dict));
}
var radio = new PdfRadioButtonField(dict);
var distinctValues = new List <string>();
foreach (var val in radio.FieldValues)
{
if (!distinctValues.Contains(val))
{
distinctValues.Add(val);
}
}
// if the Annotations of this field have all different names, we consider this as a RadioButton
if (distinctValues.Count == radio.FieldValues.Count && radio.FieldValues.Count > 1)
{
return(radio);
}
return(new PdfCheckBoxField(dict));
}
