feat: Improve canvas scrolling functionality with enhanced mouse wheel event handling

src/ui_manager.py

@@ -70,18 +70,6 @@ class UIManager:
         input_frame = ttk.Frame(canvas)
         input_frame.grid_columnconfigure(1, weight=1)
 
-        # Configure canvas scrolling
-        def configure_scroll_region(event=None):
-            canvas.configure(scrollregion=canvas.bbox("all"))
-
-        def on_mousewheel(event):
-            canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
-
-        input_frame.bind("<Configure>", configure_scroll_region)
-        canvas.bind("<MouseWheel>", on_mousewheel)  # Windows/Linux
-        canvas.bind("<Button-4>", lambda e: canvas.yview_scroll(-1, "units"))  # Linux
-        canvas.bind("<Button-5>", lambda e: canvas.yview_scroll(1, "units"))  # Linux
-
         # Place canvas and scrollbar in the container
         canvas.grid(row=0, column=0, sticky="nsew")
         scrollbar.grid(row=0, column=1, sticky="ns")
@@ -94,8 +82,53 @@ class UIManager:
             canvas_width = canvas.winfo_width()
             canvas.itemconfig(canvas_window, width=canvas_width)
 
+        # Configure canvas scrolling
+        def configure_scroll_region(event=None):
+            canvas.configure(scrollregion=canvas.bbox("all"))
+
+        def on_mousewheel(event):
+            # Check if canvas is scrollable before scrolling
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
+
+        def on_mousewheel_linux_up(event):
+            # Linux mouse wheel up
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(-1, "units")
+
+        def on_mousewheel_linux_down(event):
+            # Linux mouse wheel down
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(1, "units")
+
+        input_frame.bind("<Configure>", configure_scroll_region)
         canvas.bind("<Configure>", configure_canvas_width)
 
+        # Bind mouse wheel events to canvas and main container
+        canvas.bind("<MouseWheel>", on_mousewheel)  # Windows/Linux
+        canvas.bind("<Button-4>", on_mousewheel_linux_up)  # Linux
+        canvas.bind("<Button-5>", on_mousewheel_linux_down)  # Linux
+        main_container.bind("<MouseWheel>", on_mousewheel)  # Windows/Linux
+        main_container.bind("<Button-4>", on_mousewheel_linux_up)  # Linux
+        main_container.bind("<Button-5>", on_mousewheel_linux_down)  # Linux
+
+        # Bind mouse wheel to input frame and its children for better scrolling
+        self._bind_mousewheel_to_widget_tree(input_frame, canvas)
+
+        # Set focus to canvas to ensure it receives scroll events
+        canvas.focus_set()
+
+        # Add mouse enter/leave events to manage focus for scrolling
+        def on_mouse_enter(event):
+            canvas.focus_set()
+
+        def on_mouse_leave(event):
+            # Don't change focus when leaving to avoid disrupting user interaction
+            pass
+
+        main_container.bind("<Enter>", on_mouse_enter)
+        canvas.bind("<Enter>", on_mouse_enter)
+
         # Create variables for symptoms
         symptom_vars: dict[str, tk.IntVar] = {
             "depression": tk.IntVar(value=0),
@@ -168,6 +201,11 @@ class UIManager:
         # Set default date to today
         date_var.set(datetime.now().strftime("%m/%d/%Y"))
 
+        # Ensure mouse wheel binding is applied to all newly created widgets
+        main_container.update_idletasks()
+        canvas.configure(scrollregion=canvas.bbox("all"))
+        self._bind_mousewheel_to_widget_tree(input_frame, canvas)
+
         # Return all UI elements and variables
         return {
             "frame": main_container,
@@ -311,17 +349,48 @@ class UIManager:
             canvas.itemconfig(canvas_window, width=canvas_width)
 
         def on_mousewheel(event):
-            canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
+            # Check if canvas is scrollable before scrolling
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
+
+        def on_mousewheel_linux_up(event):
+            # Linux mouse wheel up
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(-1, "units")
+
+        def on_mousewheel_linux_down(event):
+            # Linux mouse wheel down
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(1, "units")
 
         main_container.bind("<Configure>", configure_scroll_region)
         canvas.bind("<Configure>", configure_canvas_width)
+
+        # Bind mouse wheel events to canvas and edit window
         canvas.bind("<MouseWheel>", on_mousewheel)  # Windows/Linux
-        canvas.bind("<Button-4>", lambda e: canvas.yview_scroll(-1, "units"))  # Linux
-        canvas.bind("<Button-5>", lambda e: canvas.yview_scroll(1, "units"))  # Linux
+        canvas.bind("<Button-4>", on_mousewheel_linux_up)  # Linux
+        canvas.bind("<Button-5>", on_mousewheel_linux_down)  # Linux
+        edit_win.bind("<MouseWheel>", on_mousewheel)  # Windows/Linux
+        edit_win.bind("<Button-4>", on_mousewheel_linux_up)  # Linux
+        edit_win.bind("<Button-5>", on_mousewheel_linux_down)  # Linux
 
         # Bind mouse wheel to main container and its children for better scrolling
         self._bind_mousewheel_to_widget_tree(main_container, canvas)
 
+        # Set focus to canvas to ensure it receives scroll events
+        canvas.focus_set()
+
+        # Add mouse enter/leave events to manage focus for scrolling
+        def on_mouse_enter(event):
+            canvas.focus_set()
+
+        def on_mouse_leave(event):
+            # Don't change focus when leaving to avoid disrupting user interaction
+            pass
+
+        edit_win.bind("<Enter>", on_mouse_enter)
+        canvas.bind("<Enter>", on_mouse_enter)
+
         # Unpack values - handle both old and new CSV formats
         if len(values) == 10:
             # Old format: date, dep, anx, slp, app, bup, hydro, gaba, prop, note
@@ -427,6 +496,9 @@ class UIManager:
         edit_win.update_idletasks()
         canvas.configure(scrollregion=canvas.bbox("all"))
 
+        # Ensure mouse wheel binding is applied to all newly created widgets
+        self._bind_mousewheel_to_widget_tree(main_container, canvas)
+
         # Make window modal
         edit_win.focus_set()
         edit_win.grab_set()
@@ -968,18 +1040,42 @@ class UIManager:
         """Recursively bind mouse wheel events to all widgets in the tree."""
 
         def on_mousewheel(event):
-            canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
+            # Check if canvas is scrollable before scrolling
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(int(-1 * (event.delta / 120)), "units")
+
+        def on_mousewheel_linux_up(event):
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(-1, "units")
+
+        def on_mousewheel_linux_down(event):
+            if canvas.cget("scrollregion"):
+                canvas.yview_scroll(1, "units")
 
         # Bind to the widget itself
-        widget.bind("<MouseWheel>", on_mousewheel)
-        widget.bind("<Button-4>", lambda e: canvas.yview_scroll(-1, "units"))
-        widget.bind("<Button-5>", lambda e: canvas.yview_scroll(1, "units"))
+        try:
+            widget.bind("<MouseWheel>", on_mousewheel)
+            widget.bind("<Button-4>", on_mousewheel_linux_up)
+            widget.bind("<Button-5>", on_mousewheel_linux_down)
+        except tk.TclError:
+            # Some widgets might not support binding
+            pass
 
         # Recursively bind to all children
-        for child in widget.winfo_children():
-            # Skip certain widgets that have their own scrolling behavior
-            if not isinstance(child, tk.Text | tk.Listbox | tk.Canvas):
-                self._bind_mousewheel_to_widget_tree(child, canvas)
+        try:
+            for child in widget.winfo_children():
+                # Skip widgets that have their own scrolling behavior or are problematic
+                skip_types = (tk.Text, tk.Listbox, tk.Canvas, ttk.Notebook)
+                if not isinstance(child, skip_types):
+                    self._bind_mousewheel_to_widget_tree(child, canvas)
+                elif isinstance(child, ttk.Notebook):
+                    # For notebooks, bind to their tab frames
+                    for tab_id in child.tabs():
+                        tab_widget = child.nametowidget(tab_id)
+                        self._bind_mousewheel_to_widget_tree(tab_widget, canvas)
+        except tk.TclError:
+            # Handle potential errors when accessing children
+            pass
 
     def _create_edit_fields(
         self,