Browser.py: On "by 1st sorter", add vertical label for secondary sorter.

diff --git a/browser.py b/browser.py
index f39e6c4490eddd447569bfc57270f2361bf67b3a..0b8e9d7c22df4a6e4514bbe68efb68be6e9cf770 100755 (executable)
--- a/browser.py
+++ b/browser.py
@@ -8,7 +8,7 @@ from os.path import (exists as path_exists, join as path_join, abspath, isdir,
                      splitext, getmtime)
 from datetime import datetime, timezone, timedelta
 from argparse import ArgumentParser
-from math import ceil
+from math import ceil, radians
 from PIL import Image
 from PIL.PngImagePlugin import PngImageFile
 import gi  # type: ignore
@@ -16,8 +16,9 @@ gi.require_version('Gtk', '4.0')
 gi.require_version('Gdk', '4.0')
 gi.require_version('Gio', '2.0')
 # pylint: disable=wrong-import-position
-from gi.repository import Gdk, Gtk, Gio, Pango  # type: ignore  # noqa: E402
-from gi.repository import GObject, GLib  # type: ignore  # noqa: E402
+from gi.repository import (Gdk, Gio, GLib,  # type: ignore  # noqa: E402
+                           GObject, Gtk, Pango,  # type: ignore  # noqa: E402
+                           PangoCairo)  # type: ignore  # noqa: E402
 # pylint: disable=no-name-in-module
 from stable.gen_params import (GenParams,  GEN_PARAMS_FLOAT,  # noqa: E402
                                GEN_PARAMS_INT, GEN_PARAMS_STR,  # noqa: E402
@@ -469,6 +470,24 @@ class ImgItem(GalleryItem):
         self.slot.mark('bookmarked', positive)
 
 
+class VerticalLabel(Gtk.DrawingArea):
+    """Label of vertical text (rotated -90°)."""
+
+    def __init__(self, text):
+        super().__init__()
+        self._text = text
+        self.set_draw_func(self.on_draw)
+
+    def on_draw(self, _, cairo_ctx, __, height):
+        """Create Pango Layout from ._text, rotate and re-size."""
+        layout = self.create_pango_layout(self._text)
+        text_width, text_height = layout.get_pixel_size()
+        cairo_ctx.translate(0, text_width + (height - text_width) / 2)
+        cairo_ctx.rotate(radians(-90))
+        PangoCairo.show_layout(cairo_ctx, layout)
+        self.set_size_request(text_height, text_width)
+
+
 class Gallery:
     """Representation of GalleryItems below a directory."""
 
@@ -754,11 +773,14 @@ class Gallery:
                 return f
 
             def build_rows_by_attrs(remaining_attrs,
-                                    items_of_parent_attr_value):
+                                    items_of_parent_attr_value,
+                                    parent_attr_value=None):
                 if not items_of_parent_attr_value:
                     return
                 attr_name, attr_values = remaining_attrs[0]
                 if 1 == len(remaining_attrs):
+                    self._grid.attach(VerticalLabel(str(parent_attr_value)),
+                                      0, i_row_ref[0], 1, 1)
                     row = [None] * len(attr_values)
                     for item in items_of_parent_attr_value:
                         val = getattr(item, attr_name)
@@ -774,7 +796,7 @@ class Gallery:
                             slot = GallerySlot(GalleryItem('', ''))  # dummy
                         self.slots += [slot]
                         i_slot_ref[0] += 1
-                        self._grid.attach(slot, i_col, i_row_ref[0], 1, 1)
+                        self._grid.attach(slot, i_col+1, i_row_ref[0], 1, 1)
                     i_row_ref[0] += 1
                     return
                 for attr_value in attr_values:
@@ -782,7 +804,8 @@ class Gallery:
                             x for x in items_of_parent_attr_value
                             if attr_value == getattr(x, attr_name)]
                     build_rows_by_attrs(remaining_attrs[1:],
-                                        items_of_attr_value)
+                                        items_of_attr_value,
+                                        attr_value)
 
             if self._grid:
                 self._fixed_frame.remove(self._grid)
@@ -1009,7 +1032,8 @@ class MainWindow(Gtk.Window):
         viewer.append(self.navbar)
         viewer.append(self.gallery.frame)
         self.side_box = Gtk.Notebook.new()
-        self.side_box.append_page(init_metadata_box(), Gtk.Label(label='metadata'))
+        self.side_box.append_page(init_metadata_box(),
+                                  Gtk.Label(label='metadata'))
         self.side_box.append_page(self.app.conf.box, Gtk.Label(label='config'))
         box_outer = Gtk.Box(orientation=OR_H)
         box_outer.append(self.side_box)