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Update to use real font in PdfTextForm #15

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Update to use real font in PdfTextForm #15

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d0f1ff6
Added TextAnchor (default = Center) and Font usage in PdfTextField
PlPt-ads-tec May 10, 2023
cfe14ef
Updated ParseFont in AcroForms PdfTextField from string split to regex.
PlPt-ads-tec May 22, 2023
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35 changes: 33 additions & 2 deletions src/foundation/src/PDFsharp/src/PdfSharp/Pdf.AcroForms/PdfTextField.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
using PdfSharp.Pdf.Advanced;
using PdfSharp.Pdf.Annotations;
using PdfSharp.Pdf.Internal;
using System.Text.RegularExpressions;

namespace PdfSharp.Pdf.AcroForms
{
Expand Down Expand Up @@ -36,7 +37,13 @@ public string Text
/// <summary>
/// Gets or sets the font used to draw the text of the field.
/// </summary>
public XFont Font { get; set; } = new XFont("Courier New", 10);
public XFont Font
{
get {
return GetFontFromDAKeyString(Elements.GetString(PdfAcroField.Keys.DA));
}
set { Elements.SetString(PdfAcroField.Keys.DA, value.ToString()); RenderAppearance(); } //HACK in PdfTextField
}

/// <summary>
/// Gets or sets the foreground color of the field.
Expand All @@ -58,6 +65,11 @@ public int MaxLength
set => Elements.SetInteger(Keys.MaxLen, value);
}

/// <summary>
/// Defines TextAnchor inside TextField e.g. Centering
/// </summary>
public XStringFormat TextAchor { get; set; } = XStringFormats.CenterLeft;

/// <summary>
/// Gets or sets a value indicating whether the field has multiple lines.
/// </summary>
Expand Down Expand Up @@ -204,7 +216,7 @@ void RenderAppearance()
string text = Text;
if (text.Length > 0)
gfx.DrawString(Text, Font, new XSolidBrush(ForeColor),
rect.ToXRect() - rect.Location + new XPoint(2, 0), XStringFormats.TopLeft);
rect.ToXRect() - rect.Location + new XPoint(2, 0), this.TextAchor);

form.DrawingFinished();
form.PdfForm.Elements.Add("/FormType", new PdfLiteral("1"));
Expand All @@ -231,6 +243,25 @@ void RenderAppearance()
#endif
}

/// <summary>
/// Parses <see cref="XFont"/> from a PODF Dictionary DA Key String
/// </summary>
/// <param name="DAValue">String Value of Dictionary Key</param>
/// <returns>XFont corresponding to DA Key string</returns>
public static XFont GetFontFromDAKeyString(string DAValue)
{
string fontRegexPattern = "^\\/(?<FontName>[^\\s]*)\\s(?<FontSize>[.?\\d]+]*)"; // REgex to match a /DA Key string e.g. /Arial 10 Tf 0.0 g
Regex fontRegex = new Regex(fontRegexPattern);
Match fontMatch = fontRegex.Match(DAValue);

if (!fontMatch.Success) throw new ArgumentException($"The Font string '{DAValue}' is not matched by font regex '{fontRegexPattern}'. Check if the string is correct.");

string fontName = fontMatch.Groups["FontName"].Value;
string fontSize = fontMatch.Groups["FontSize"].Value;

return new XFont(fontName, double.Parse(fontSize));
}

internal override void PrepareForSave()
{
base.PrepareForSave();
Expand Down