Added drag scroll of image

src/core/containers/image_view_evebox.py

@@ -0,0 +1,90 @@
+# Python imports
+
+# Lib imports
+import gi
+gi.require_version('Gtk', '3.0')
+gi.require_version('Gdk', '3.0')
+from gi.repository import Gtk
+from gi.repository import Gdk
+
+# Application imports
+from ..widgets.image_view import ImageView
+
+
+
+class ImageViewEveBox(Gtk.EventBox):
+    def __init__(self, vadjustment, hadjustment):
+        super(ImageViewEveBox, self).__init__()
+
+        self.vadjustment   = vadjustment
+        self.hadjustment   = hadjustment
+        self._is_dragging  = False
+        self._drag_start_x = 0
+        self._drag_start_y = 0
+        self._current_x    = 0
+        self._current_y    = 0
+
+        self._setup_styling()
+        self._setup_signals()
+        self._subscribe_to_events()
+        self._load_widgets()
+
+        self.show_all()
+
+
+    def _setup_styling(self):
+        ...
+
+    def _setup_signals(self):
+        self.connect("button-press-event", self._press_event)
+        self.connect("motion-notify-event", self._move_motion_event)
+        self.connect("button-release-event", self._release_event)
+
+    def _subscribe_to_events(self):
+        ...
+
+    def _load_widgets(self):
+        self.add(ImageView())
+
+    def _press_event(self, widget = None, eve = None):
+        window = settings.get_main_window()
+        cursor = Gdk.Cursor(Gdk.CursorType.CROSSHAIR)
+        window.get_window().set_cursor(cursor)
+
+        self._is_dragging  = True
+        self._drag_start_x = eve.x_root
+        self._drag_start_y = eve.y_root
+
+    def _move_motion_event(self, widget = None, eve = None):
+        if self._is_dragging:
+            vval      = self.vadjustment.get_value()
+            hval      = self.hadjustment.get_value()
+            hstep_val = self.hadjustment.get_step_increment()
+            vstep_val = self.vadjustment.get_step_increment()
+
+            if eve.x_root > self._drag_start_x:
+                self.hadjustment.set_value(hval + hstep_val)
+            elif eve.x_root < self._drag_start_x:
+                self.hadjustment.set_value(hval - hstep_val)
+            else:
+                self.hadjustment.set_value(hval)
+
+            if eve.y_root > self._drag_start_y:
+                self.vadjustment.set_value(vval + vstep_val)
+            elif eve.y_root < self._drag_start_y:
+                self.vadjustment.set_value(vval - vstep_val)
+            else:
+                self.vadjustment.set_value(vval)
+
+            self._drag_start_x = eve.x_root
+            self._drag_start_y = eve.y_root
+
+
+    def _release_event(self, widget = None, eve = None):
+        window = settings.get_main_window()
+        watch_cursor = Gdk.Cursor(Gdk.CursorType.ARROW)
+        window.get_window().set_cursor(watch_cursor)
+
+        self._is_dragging  = False
+        self._drag_start_x = 0
+        self._drag_start_y = 0

src/core/containers/image_view_scroll.py

@@ -10,7 +10,7 @@ from gi.repository import Gdk
 from gi.repository import GLib
 
 # Application imports
-from ..widgets.image_view import ImageView
+from .image_view_evebox import ImageViewEveBox
 
 
 
@@ -41,19 +41,21 @@ class ImageViewScroll(Gtk.ScrolledWindow):
         self.connect("size-allocate", self._size_request_change)
         self.connect('scroll-event', self.on_scroll)
 
-    def _load_widgets(self):
-        self.add(ImageView())
-
     def _subscribe_to_events(self):
         event_system.subscribe("do_filter_open", self._do_filter_open)
 
+    def _load_widgets(self):
+        vadjustment = self.get_vadjustment()
+        hadjustment = self.get_hadjustment()
+        self.add(ImageViewEveBox(vadjustment, hadjustment))
+
     def _set_up_dnd(self):
         flags           = Gtk.DestDefaults.ALL
         URI_TARGET_TYPE = 80
 
-        uri_target  = Gtk.TargetEntry.new('text/uri-list', Gtk.TargetFlags(0), URI_TARGET_TYPE)
-        targets     = [ uri_target ]
-        action      = Gdk.DragAction.COPY
+        uri_target = Gtk.TargetEntry.new('text/uri-list', Gtk.TargetFlags(0), URI_TARGET_TYPE)
+        targets    = [ uri_target ]
+        action     = Gdk.DragAction.COPY
 
         self.drag_dest_set(flags, targets, action)
         self.connect("drag-data-received", self._on_drag_data_received)
@@ -68,8 +70,7 @@ class ImageViewScroll(Gtk.ScrolledWindow):
 
 
     def _do_filter_open(self, uris: [] = []):
-        if len(uris) == 0:
-            return
+        if len(uris) == 0: return
 
         has_loaded_image, path, img_list = self.filter_for_images(uris)
         self._handle_open(has_loaded_image, path, img_list)
@@ -98,8 +99,7 @@ class ImageViewScroll(Gtk.ScrolledWindow):
         return has_loaded_image, path, img_list
 
     def _handle_open(self, has_loaded_image, path, img_list):
-        if len(img_list) == 0:
-            return
+        if len(img_list) == 0: return
 
         if not has_loaded_image:
             img    = img_list[0]