From 5500f93feb65157895bb0e5aea5800b9099f95b8 Mon Sep 17 00:00:00 2001
From: vk-github18 <vk-github18@gmail.com>
Date: Mon, 10 Aug 2026 21:31:45 +0200
Subject: [PATCH] Computing the stringWidth for a Form

---
 .../pdmodel/interactive/AppearanceStyle.java  | 26 ++++++++++++++++++-
 .../interactive/PlainTextFormatter.java       | 13 +++++++++-
 .../form/AppearanceGeneratorHelper.java       |  5 +++-
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/AppearanceStyle.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/AppearanceStyle.java
index df04d44adbf..72b862103a9 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/AppearanceStyle.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/AppearanceStyle.java
@@ -16,6 +16,7 @@
  */
 package org.apache.pdfbox.pdmodel.interactive;
 
+import org.apache.pdfbox.pdmodel.GlyphLayoutProcessorInterface;
 import org.apache.pdfbox.pdmodel.font.PDFont;
 
 /**
@@ -38,7 +39,12 @@ public class AppearanceStyle
      * Defaulting to 1.2*fontSize to match Acrobats default.
      */
     private float leading = 14.4f;
-    
+
+    /**
+     * Glyph layout processor
+     */
+    private GlyphLayoutProcessorInterface glyphLayoutProcessor;
+
     /**
      * Get the font used for text formatting.
      * 
@@ -99,4 +105,22 @@ public void setLeading(float leading)
     {
         this.leading = leading;
     }
+
+    /**
+     *
+     * @param glyphLayoutProcessor
+     */
+    public void setGlyphLayoutProcessor(GlyphLayoutProcessorInterface glyphLayoutProcessor)
+    {
+        this.glyphLayoutProcessor = glyphLayoutProcessor;
+    }
+
+    /**
+     *
+     * @return
+     */
+    public GlyphLayoutProcessorInterface getGlyphLayoutProcessor()
+    {
+        return glyphLayoutProcessor;
+    }
 }
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/PlainTextFormatter.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/PlainTextFormatter.java
index 3e41fe2ec76..90bf7de4d57 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/PlainTextFormatter.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/PlainTextFormatter.java
@@ -19,7 +19,10 @@
 import java.io.IOException;
 import java.util.List;
 
+import org.apache.pdfbox.pdmodel.GlyphLayoutProcessorInterface;
 import org.apache.pdfbox.pdmodel.PDAppearanceContentStream;
+import org.apache.pdfbox.pdmodel.font.PDFont;
+import org.apache.pdfbox.pdmodel.font.PDType0Font;
 import org.apache.pdfbox.pdmodel.interactive.PlainText.Line;
 import org.apache.pdfbox.pdmodel.interactive.PlainText.Paragraph;
 import org.apache.pdfbox.pdmodel.interactive.PlainText.TextAttribute;
@@ -246,7 +249,15 @@ private void processLines(List<Line> lines, boolean isFirstParagraph) throws IOE
             for (Word word : words)
             {
                 contents.showText(word.getText());
-                wordWidth = (Float) word.getAttributes().getIterator().getAttribute(TextAttribute.WIDTH);
+                GlyphLayoutProcessorInterface glyphLayoutProcessor = appearanceStyle.getGlyphLayoutProcessor();
+                PDFont font = appearanceStyle.getFont();
+                if (glyphLayoutProcessor == null || !glyphLayoutProcessor.supportsFont(font))
+                {
+                    wordWidth = (Float) word.getAttributes().getIterator().getAttribute(TextAttribute.WIDTH);
+                } else {
+                    wordWidth = glyphLayoutProcessor.getStringWidth(
+                            (PDType0Font) font, appearanceStyle.getFontSize(), word.getText());
+                }
                 if (wordIndex != words.size() -1)
                 {
                     contents.newLineAtOffset(wordWidth + interWordSpacing, 0f);
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
index 29d21c86a3d..458dd17c42d 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
@@ -637,7 +637,10 @@ else if (field instanceof PDListBox)
                 AppearanceStyle appearanceStyle = new AppearanceStyle();
                 appearanceStyle.setFont(font);
                 appearanceStyle.setFontSize(fontSize);
-                
+                if (glyphLayoutProcessor != null) {
+                    appearanceStyle.setGlyphLayoutProcessor(glyphLayoutProcessor);
+                }
+
                 // Adobe Acrobat uses the font's bounding box for the leading between the lines
                 appearanceStyle.setLeading(font.getBoundingBox().getHeight() * fontScaleY);