Updated imgs thumbnail scrolling logic

src/new-src/core/containers/image_list_scroll.py

@@ -25,9 +25,37 @@ class ImageListScroll(Gtk.ScrolledWindow):
         self.set_vexpand(True)
 
     def _setup_signals(self):
-        ...
+        self.connect("edge-reached", self._handle_edge_reached)
+        self.connect("edge-overshot", self._handle_edge_reached)
 
     def _load_widgets(self):
-        viewport = Gtk.Viewport()
+        self.add(ImageList())
-        viewport.add(ImageList())
+
-        self.add(viewport)
+    def _handle_edge_reached(self, widget, edge):
+        img_list   = widget.get_children()[0].get_children()[0]
+        children   = img_list.get_children()
+        start, end = None, None
+        size       = len(children)
+
+        for i, child in enumerate(children):
+            if start in (None, "") and child.is_visible():
+                start = i
+
+            if end in (None, "") and not start in (None, "") and not \
+                child.is_visible():
+                    end = (i - 1)
+                    break
+
+        if not end:
+            end = size - 1
+
+        if edge == Gtk.PositionType.TOP:
+            if start >= 1 and not end in (None, ""):
+                start -= 1
+                children[end].hide()
+                children[start].show()
+        if edge == Gtk.PositionType.BOTTOM:
+            if not end in (None, "") and not (end + 1) == size:
+                end += 1
+                children[start].hide()
+                children[end].show()

src/new-src/core/containers/image_view_scroll.py

@@ -37,9 +37,7 @@ class ImageViewScroll(Gtk.ScrolledWindow):
         self._set_up_dnd()
 
     def _load_widgets(self):
-        viewport = Gtk.Viewport()
+        self.add(ImageView())
-        viewport.add(ImageView())
-        self.add(viewport)
 
     def _subscribe_to_events(self):
         event_system.subscribe("do_filter_open", self._do_filter_open)

src/new-src/core/widgets/image.py

@@ -5,6 +5,7 @@ import gi
 gi.require_version('Gtk', '3.0')
 gi.require_version('GdkPixbuf', '2.0')
 from gi.repository import Gtk
+from gi.repository import GLib
 from gi.repository import GdkPixbuf
 
 try:

src/new-src/core/widgets/image_list.py

@@ -10,6 +10,7 @@ from gi.repository import Gtk
 from ..widgets.image import Image
 
 
+
 class ImageList(Gtk.Box):
     def __init__(self):
         super(ImageList, self).__init__()