1 files changed, 46 insertions, 5 deletions
diff --git a/app/ui/tui.py b/app/ui/tui.py
index a647444..933626f 100644
--- a/app/ui/tui.py
+++ b/app/ui/tui.py
@@ -1492,9 +1492,50 @@ def checkbox_tree(scr, title: str, families: List[dict],
                                 if options:
                                     checked.add((index, options[0]["key"]))
                             expanded.add(index)
+                else:
+                    _, index, option_key = node
+                    if (index, option_key) in checked:
+                        checked.discard((index, option_key))
                     else:
-                        _, index, option_key = node
-                        if (index, option_key) in checked:
-                            checked.discard((index, option_key))
-                        else:
-                            checked.add((index, option_key))
+                        checked.add((index, option_key))
+
+
+# ---------------------------------------------------------------------------
+# Widget: scrollable text viewer
+# ---------------------------------------------------------------------------
+
+def text_viewer(scr, title: str, lines: Sequence[str],
+                back_value: object = None) -> object:
+    """Show LINES as a read-only dialog; Esc/q/Enter closes it.
+
+    A scrollable pop-up for longer explanatory text (the hub's Help
+    screen). Rows wrap like body rows and stay centered; none is
+    selectable, so no cursor bar is drawn — but the (logical) cursor
+    still scrolls the view into place: Up/Down (or k/j) move one line,
+    Home/End jump to the top/bottom, PageUp/PageDown page, and the
+    frame's scroll indicator (``x/y`` in the border) appears whenever
+    the text overflows the dialog. Closing returns BACK_VALUE when it
+    is given (not None), so the caller can fall back a screen; without
+    one, Esc/q raise WizardCancelled as in menu().
+    """
+    frame = Frame(scr, title,
+                  "Up/Down = scroll  PgUp/PgDn = page  Enter/Esc = close")
+    for line in lines:
+        frame.mark(line)
+    cursor = 0
+    while True:
+        cursor = max(0, min(cursor, len(frame.rows) - 1))
+        frame.cursor = cursor if frame.rows else None
+        frame.draw()
+        key = frame.get_key(cancel_keys=())
+        if key in _CANCEL_KEYS:
+            if back_value is not None:
+                return back_value
+            raise WizardCancelled()
+        moved = frame.motion(key, cursor, len(frame.rows))
+        if moved is not None:
+            cursor = moved
+        elif key in (10, 13):
+            if back_value is not None:
+                return back_value
+            raise WizardCancelled()