Toolbar: pane toggle + tidy buttons, tooltips on every icon

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

main.py

@@ -28,6 +28,36 @@ TREE_MIN_COLUMN_WIDTH = 40
 # panes in proportion to their weights. Left at the ten-row default the palette asked for
 # so much that the tree, carrying the larger weight, gave up all of its height first.
 TREE_REQUESTED_ROWS = 6
+
+
+class _ToolTip:
+    """Minimal hover tooltip for toolbar widgets."""
+
+    def __init__(self, widget, text):
+        self._widget = widget
+        self._text = text
+        self._tw = None
+        widget.bind("<Enter>", self._show, add="+")
+        widget.bind("<Leave>", self._hide, add="+")
+
+    def _show(self, _event=None):
+        x = self._widget.winfo_rootx() + self._widget.winfo_width() // 2
+        y = self._widget.winfo_rooty() + self._widget.winfo_height() + 4
+        tw = tk.Toplevel(self._widget)
+        tw.wm_overrideredirect(True)
+        tw.wm_geometry(f"+{x}+{y}")
+        label = tk.Label(
+            tw, text=self._text, background="#ffffe0", foreground="#000000",
+            relief="solid", borderwidth=1, padx=4, pady=2,
+            font=("Segoe UI", 8),
+        )
+        label.pack()
+        self._tw = tw
+
+    def _hide(self, _event=None):
+        if self._tw:
+            self._tw.destroy()
+            self._tw = None
 PALETTE_REQUESTED_ROWS = 5
 
 # Below this the shortfall is deep enough to shrink the tree past a usable few rows, and
@@ -76,6 +106,7 @@ _history_file_path = None   # the file view_history was recorded against
 # function that touches them checks first.
 btn_back = None
 btn_forward = None
+btn_toggle_pane = None
 zoom_label = None
 menu_view = None
 show_left_column_var = None
@@ -1278,6 +1309,8 @@ def apply_left_column_visibility():
     elif is_shown:
         paned_window.forget(left_pane)
 
+    _sync_pane_toggle_button()
+
 
 def toggle_left_column(event=None):
     """Keyboard route to the same toggle. The menu flips the variable for itself."""
@@ -1287,6 +1320,12 @@ def toggle_left_column(event=None):
     return "break"
 
 
+def _sync_pane_toggle_button():
+    """Update the toggle button icon to reflect the pane state."""
+    if btn_toggle_pane is not None and show_left_column_var is not None:
+        btn_toggle_pane.configure(text="◧" if show_left_column_var.get() else "▯")
+
+
 # --- Sheet view history ---
 
 def _tree_item_for_element(element):
@@ -1904,21 +1943,41 @@ app_state.status_label = status_label
 toolbar = ttk.Frame(window)
 toolbar.pack(side=tk.TOP, fill=tk.X, padx=8, pady=(4, 0))
 
-btn_back = ttk.Button(toolbar, text="◀", width=3, command=go_back, state="disabled")
-btn_back.pack(side=tk.LEFT)
-
-btn_forward = ttk.Button(toolbar, text="▶", width=3, command=go_forward, state="disabled")
-btn_forward.pack(side=tk.LEFT, padx=(3, 0))
+# U+25E7: a square with left half filled — suggests a visible side panel.
+btn_toggle_pane = ttk.Button(toolbar, text="◧", width=3, command=toggle_left_column)
+btn_toggle_pane.pack(side=tk.LEFT)
+_ToolTip(btn_toggle_pane, "Tree / Palette (Ctrl+B)")
 
 ttk.Separator(toolbar, orient=tk.VERTICAL).pack(side=tk.LEFT, fill=tk.Y, padx=8, pady=2)
 
-ttk.Button(toolbar, text="−", width=3, command=do_zoom_out).pack(side=tk.LEFT)
+btn_back = ttk.Button(toolbar, text="◀", width=3, command=go_back, state="disabled")
+btn_back.pack(side=tk.LEFT)
+_ToolTip(btn_back, "Back (Alt+Left)")
+
+btn_forward = ttk.Button(toolbar, text="▶", width=3, command=go_forward, state="disabled")
+btn_forward.pack(side=tk.LEFT, padx=(3, 0))
+_ToolTip(btn_forward, "Forward (Alt+Right)")
+
+ttk.Separator(toolbar, orient=tk.VERTICAL).pack(side=tk.LEFT, fill=tk.Y, padx=8, pady=2)
+
+_btn_zoom_out = ttk.Button(toolbar, text="−", width=3, command=do_zoom_out)
+_btn_zoom_out.pack(side=tk.LEFT)
+_ToolTip(_btn_zoom_out, "Zoom Out (Ctrl+−)")
+
 zoom_label = ttk.Label(toolbar, text="100%", width=6, anchor="center")
 zoom_label.pack(side=tk.LEFT, padx=1)
-ttk.Button(toolbar, text="+", width=3, command=do_zoom_in).pack(side=tk.LEFT)
 
-# U+26F6, the four-corners frame every other editor marks "fit to window" with.
-ttk.Button(toolbar, text="⛶", width=3, command=do_zoom_fit).pack(side=tk.LEFT, padx=(3, 0))
+_btn_zoom_in = ttk.Button(toolbar, text="+", width=3, command=do_zoom_in)
+_btn_zoom_in.pack(side=tk.LEFT)
+_ToolTip(_btn_zoom_in, "Zoom In (Ctrl++)")
+
+_btn_zoom_fit = ttk.Button(toolbar, text="⛶", width=3, command=do_zoom_fit)
+_btn_zoom_fit.pack(side=tk.LEFT, padx=(3, 0))
+_ToolTip(_btn_zoom_fit, "Zoom to Fit (Ctrl+9)")
+
+_btn_tidy = ttk.Button(toolbar, text="⊞", width=3, command=do_tidy_layout)
+_btn_tidy.pack(side=tk.LEFT, padx=(3, 0))
+_ToolTip(_btn_tidy, "Tidy Layout (Ctrl+W)")
 
 paned_window = ttk.PanedWindow(window, orient=tk.HORIZONTAL)
 paned_window.pack(fill=tk.BOTH, expand=True, padx=5, pady=5)