From 8d06492dbc320cd559ab44ed42202f7d839b366e Mon Sep 17 00:00:00 2001
From: serversdwn <brianharrison02@gmail.com>
Date: Wed, 11 Mar 2026 16:58:17 -0400
Subject: [PATCH] feat: SUB header line in Diff tab now linked to corresponding
 hex dump.

---
 seismo_lab.py | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/seismo_lab.py b/seismo_lab.py
index ad7d970..7ec865d 100644
--- a/seismo_lab.py
+++ b/seismo_lab.py
@@ -743,6 +743,16 @@ class AnalyzerPanel(tk.Frame):
             except (IndexError, ValueError):
                 pass
 
+    def _find_frame_by_sub(self, sess_idx: int, sub: int, page_key: int) -> Optional[AnnotatedFrame]:
+        """Find a frame in a session by (sub, page_key) — used for diff click-through."""
+        if sess_idx >= len(self.state.sessions):
+            return None
+        sess = self.state.sessions[sess_idx]
+        for af in sess.bw_frames + sess.s3_frames:
+            if af.header and af.header.sub == sub and af.header.page_key == page_key:
+                return af
+        return None
+
     def _find_frame(self, sess_idx: int, frame_idx: int, source: str) -> Optional[AnnotatedFrame]:
         if sess_idx >= len(self.state.sessions):
             return None
@@ -792,9 +802,28 @@ class AnalyzerPanel(tk.Frame):
             self._tw(w, "  No changes detected.\n", "dim")
         else:
             self._tw(w, f"DIFF vs SESSION {idx-1}\n", "head")
+            self._tw(w, "  (click any SUB header to open its hex dump)\n", "dim")
             for fd in diffs:
                 pg = f" (page {fd.page_key:04X})" if fd.page_key else ""
-                self._tw(w, f"\n  SUB {fd.sub:02X} ({fd.sub_name}){pg}:\n", "addr")
+                link_tag = f"difflink_{fd.sub}_{fd.page_key}"
+                w.configure(state="normal")
+                start = w.index(tk.INSERT)
+                w.insert(tk.END, f"\n  SUB {fd.sub:02X} ({fd.sub_name}){pg}:\n")
+                end = w.index(tk.INSERT)
+                w.tag_add("addr", start, end)
+                w.tag_add(link_tag, start, end)
+                w.tag_configure(link_tag, underline=True)
+                # capture fd values for the closure
+                def _make_handler(s=idx, sub=fd.sub, pk=fd.page_key):
+                    def _handler(event):
+                        af = self._find_frame_by_sub(s, sub, pk)
+                        if af:
+                            self._show_frame_detail(s, af.frame.index, af.source)
+                    return _handler
+                w.tag_bind(link_tag, "<Button-1>", _make_handler())
+                w.tag_bind(link_tag, "<Enter>", lambda e, t=link_tag: w.configure(cursor="hand2"))
+                w.tag_bind(link_tag, "<Leave>", lambda e: w.configure(cursor=""))
+                w.configure(state="disabled")
                 for bd in fd.diffs:
                     b = f"{bd.before:02x}" if bd.before >= 0 else "--"
                     a = f"{bd.after:02x}"  if bd.after  >= 0 else "--"