Reflow deterministico: stile iniettato nell'HTML del capitolo (chapterHtml+loadHtml), niente JS post-load; runJavaScript solo per lo scroll

src/epub.cpp

@@ -2,8 +2,10 @@
 
 #include <QDir>
 #include <QFile>
+#include <QFileInfo>
 #include <QHash>
 #include <QStringList>
+#include <QUrl>
 #include <QXmlStreamReader>
 
 #include <zlib.h>
@@ -404,6 +406,37 @@ QVariantList EpubBook::chapterList() const
     return list;
 }
 
+QString EpubBook::chapterHtml(int index, int fontSizePx) const
+{
+    if (index < 0 || index >= m_chapters.size())
+        return QString();
+    QFile f(m_chapters.at(index).path);
+    if (!f.open(QIODevice::ReadOnly))
+        return QString();
+    QString html = QString::fromUtf8(f.readAll());
+
+    // stile di reflow iniettato nel documento: !important vince sui CSS del libro
+    const QString style = QStringLiteral(
+            "<style id=\"cw-font\">html,body{font-size:%1px!important}"
+            "p,div,li,td,blockquote,section{font-size:1em!important}</style>")
+            .arg(fontSizePx);
+    const int headEnd = html.indexOf(QStringLiteral("</head>"), 0, Qt::CaseInsensitive);
+    if (headEnd >= 0)
+        html.insert(headEnd, style);
+    else
+        html.prepend(style);
+    return html;
+}
+
+QString EpubBook::chapterBaseUrl(int index) const
+{
+    if (index < 0 || index >= m_chapters.size())
+        return QString();
+    return QUrl::fromLocalFile(
+            QFileInfo(m_chapters.at(index).path).absolutePath() + QStringLiteral("/"))
+            .toString();
+}
+
 QString EpubBook::makeBookmarkKey(int chapterIndex, double fraction) const
 {
     return QStringLiteral("cw:v1:%1:%2").arg(chapterIndex).arg(fraction, 0, 'f', 4);

src/epub.h

@@ -36,6 +36,10 @@ public:
     Q_INVOKABLE QString chapterTitle(int index) const;
     // elenco [{index, title}] per la lista capitoli
     Q_INVOKABLE QVariantList chapterList() const;
+    // HTML del capitolo con lo stile di reflow iniettato (font-size in px)
+    Q_INVOKABLE QString chapterHtml(int index, int fontSizePx) const;
+    // base URL (file://) per risolvere immagini/CSS relativi del capitolo
+    Q_INVOKABLE QString chapterBaseUrl(int index) const;
 
     // chiave segno locale, es. "cw:v1:3:0.42" (capitolo 3, 42% del capitolo)
     Q_INVOKABLE QString makeBookmarkKey(int chapterIndex, double fraction) const;