Browser: Minor code restructuring.

diff --git a/browser.py b/browser.py
index bd60c4e5fb0c492431fbd85265beb763d0ee9dfd..6de27286f4a74bbab693a910b3770fa4f50ec47e 100755 (executable)
--- a/browser.py
+++ b/browser.py
@@ -538,7 +538,7 @@ class Gallery:
         scroller = Gtk.ScrolledWindow(propagate_natural_height=True)
         self._col_headers_frame = Gtk.Fixed()
         self._col_headers_grid = None
-        self._vlabel_height_ref = [0]
+        self._slot_size_ref = [0]
         self.frame = Gtk.Box(orientation=OR_V)
         self.frame.append(self._col_headers_frame)
         self.frame.append(scroller)
@@ -810,7 +810,7 @@ class Gallery:
                 if 1 == len(remaining):
                     for i, attr in enumerate(ancestors):
                         vlabel = VerticalLabel(f'<b>{attr[0]}</b>: {attr[1]}',
-                                               self._vlabel_height_ref)
+                                               self._slot_size_ref)
                         self._grid.attach(vlabel, i, i_row_ref[0], 1, 1)
                     row = [None] * len(attr_values)
                     for item in items_of_parent:
@@ -943,16 +943,17 @@ class Gallery:
         vp_top = vp_scroll.get_value()
         vp_bottom = vp_top + vp_height
         side_offset, i_vlabels = 0, 0
-        while True:
-            widget = self._grid.get_child_at(i_vlabels, 0)
-            if isinstance(widget, VerticalLabel):
-                side_offset += widget.width
-            else:
-                break
-            i_vlabels += 1
+        if self._by_1st:
+            while True:
+                widget = self._grid.get_child_at(i_vlabels, 0)
+                if isinstance(widget, VerticalLabel):
+                    side_offset += widget.width
+                else:
+                    break
+                i_vlabels += 1
         max_slot_width = (vp_width - side_offset) // self._per_row
         slot_size = min(vp_height, max_slot_width)
-        self._vlabel_height_ref[0] = slot_size
+        self._slot_size_ref[0] = slot_size
         if self._by_1st:
             i_widgets = 0
             while True:
@@ -968,16 +969,17 @@ class Gallery:
         for idx, slot in enumerate(self.slots):
             slot.ensure_slot_size(slot_size_sans_margin, self._slot_margin)
         vp_scroll.set_upper(slot_size * ceil(len(self.slots) / self._per_row))
-        if self._scroll_to_focus(slot_size, vp_scroll, vp_top, vp_bottom):
+        if self._scroll_to_focus(vp_scroll, vp_top, vp_bottom):
             return
         for idx, slot in enumerate(self.slots):
-            in_vp, _, _ = self._position_to_viewport(
-                    idx, slot_size, vp_top, vp_bottom, True)
+            in_vp, _, _ = self._position_to_viewport(idx,
+                                                     vp_top, vp_bottom, True)
             slot.update_widget(in_vp)
         self._start_redraw_wait = datetime.now()
 
     def _position_to_viewport(
-            self, idx, slot_size, vp_top, vp_bottom, in_vp_greedy=False):
+            self, idx, vp_top, vp_bottom, in_vp_greedy=False):
+        slot_size = self._slot_size_ref[0]
         slot_top = (idx // self._per_row) * slot_size
         slot_bottom = slot_top + slot_size
         if in_vp_greedy:
@@ -986,7 +988,8 @@ class Gallery:
             in_vp = (slot_top >= vp_top and slot_bottom <= vp_bottom)
         return in_vp, slot_top, slot_bottom
 
-    def _scroll_to_focus(self, slot_size, vp_scroll, vp_top, vp_bottom):
+    def _scroll_to_focus(self, vp_scroll, vp_top, vp_bottom):
+        slot_size = self._slot_size_ref[0]
         scroll_to_focus = self._shall_scroll_to_focus
         self._shall_redraw, self._shall_scroll_to_focus = False, False
         if scroll_to_focus: