fix lack of snapping toggle

pyPhotoAlbum/gl_widget.py

@@ -543,16 +543,29 @@ class GLWidget(QOpenGLWidget):
                         # Transfer element to the new page
                         self._transfer_element_to_page(self.selected_element, source_page, current_page, x, y, current_renderer)
                     else:
-                        # Same page - just update position normally
+                        # Same page - update position with snapping
                         total_dx = (x - self.drag_start_pos[0]) / self.zoom_level
                         total_dy = (y - self.drag_start_pos[1]) / self.zoom_level
                         
                         new_x = self.drag_start_element_pos[0] + total_dx
                         new_y = self.drag_start_element_pos[1] + total_dy
                         
-                        self.selected_element.position = (new_x, new_y)
+                        # Apply snapping
+                        main_window = self.window()
+                        snap_sys = source_page.layout.snapping_system
+                        page_size = source_page.layout.size
+                        dpi = main_window.project.working_dpi
+                        
+                        snapped_pos = snap_sys.snap_position(
+                            position=(new_x, new_y),
+                            size=self.selected_element.size,
+                            page_size=page_size,
+                            dpi=dpi
+                        )
+                        
+                        self.selected_element.position = snapped_pos
                 else:
-                    # No page detected or no parent page - update normally
+                    # No page detected or no parent page - update normally without snapping
                     total_dx = (x - self.drag_start_pos[0]) / self.zoom_level
                     total_dy = (y - self.drag_start_pos[1]) / self.zoom_level
                     
@@ -776,9 +789,41 @@ class GLWidget(QOpenGLWidget):
         if not self.resize_start_pos or not self.resize_start_size:
             return
         
-        # Use non-snap resize for now
-        # TODO: Implement page-aware snapping
+        # Get the snapping system from the element's parent page
+        main_window = self.window()
+        if not hasattr(self.selected_element, '_parent_page'):
             self._resize_element_no_snap(dx, dy)
+            return
+        
+        parent_page = self.selected_element._parent_page
+        snap_sys = parent_page.layout.snapping_system
+        
+        # Get page size
+        page_size = parent_page.layout.size
+        dpi = main_window.project.working_dpi
+        
+        # Apply snapping to resize
+        new_pos, new_size = snap_sys.snap_resize(
+            position=self.resize_start_pos,
+            size=self.resize_start_size,
+            dx=dx,
+            dy=dy,
+            resize_handle=self.resize_handle,
+            page_size=page_size,
+            dpi=dpi
+        )
+        
+        # Apply the snapped values
+        self.selected_element.position = new_pos
+        self.selected_element.size = new_size
+        
+        # Ensure minimum size
+        min_size = 20
+        w, h = self.selected_element.size
+        if w < min_size or h < min_size:
+            w = max(w, min_size)
+            h = max(h, min_size)
+            self.selected_element.size = (w, h)
     
     def _resize_element_no_snap(self, dx, dy):
         """Resize element without snapping"""

pyPhotoAlbum/mixins/operations/view_ops.py

@@ -287,3 +287,58 @@ class ViewOperationsMixin:
             self.update_view()
             self.show_status(f"Grid size: {new_grid_size:.1f}mm, Threshold: {new_threshold:.1f}mm", 2000)
             print(f"Updated grid settings - Size: {new_grid_size:.1f}mm, Threshold: {new_threshold:.1f}mm")
+    
+    # ===== Layout Tab Snapping Controls =====
+    # These provide easy access to snapping features during layout work
+    
+    @ribbon_action(
+        label="Grid Snap",
+        tooltip="Enable/disable snapping to grid (Ctrl+G)",
+        tab="Layout",
+        group="Snapping",
+        shortcut="Ctrl+G"
+    )
+    def layout_toggle_grid_snap(self):
+        """Toggle grid snapping (Layout tab)"""
+        self.toggle_grid_snap()
+    
+    @ribbon_action(
+        label="Edge Snap",
+        tooltip="Enable/disable snapping to page edges (Ctrl+E)",
+        tab="Layout",
+        group="Snapping",
+        shortcut="Ctrl+E"
+    )
+    def layout_toggle_edge_snap(self):
+        """Toggle edge snapping (Layout tab)"""
+        self.toggle_edge_snap()
+    
+    @ribbon_action(
+        label="Guide Snap",
+        tooltip="Enable/disable snapping to guides",
+        tab="Layout",
+        group="Snapping"
+    )
+    def layout_toggle_guide_snap(self):
+        """Toggle guide snapping (Layout tab)"""
+        self.toggle_guide_snap()
+    
+    @ribbon_action(
+        label="Show Grid",
+        tooltip="Toggle visibility of snap lines",
+        tab="Layout",
+        group="Snapping"
+    )
+    def layout_toggle_snap_lines(self):
+        """Toggle snap lines visibility (Layout tab)"""
+        self.toggle_snap_lines()
+    
+    @ribbon_action(
+        label="Grid Settings...",
+        tooltip="Configure grid size and snap threshold",
+        tab="Layout",
+        group="Snapping"
+    )
+    def layout_set_grid_size(self):
+        """Open grid settings dialog (Layout tab)"""
+        self.set_grid_size()