Alpha4 polish griglie e login

ui_tables.py

@@ -0,0 +1,108 @@
+"""Shared visual helpers for data grids."""
+
+from __future__ import annotations
+
+from tkinter import ttk
+from typing import Any
+
+TABLE_ROW_EVEN = "#FFFFFF"
+TABLE_ROW_ODD = "#F4F6F8"
+TABLE_HEADER_BG = "#D1D5DB"
+TABLE_HEADER_FG = "#111827"
+TABLE_SELECTED_BG = "#DCEBFF"
+TABLE_SELECTED_FG = "#111827"
+
+
+def style_treeview(
+    tree: ttk.Treeview,
+    *,
+    style_name: str,
+    rowheight: int = 24,
+    font: Any = ("Segoe UI", 9),
+    heading_font: Any = ("Segoe UI", 9, "bold"),
+) -> ttk.Style:
+    """Apply a consistent high-contrast header and zebra-ready style."""
+
+    style = ttk.Style(tree)
+    style.configure(style_name, rowheight=rowheight, font=font)
+    style.configure(
+        f"{style_name}.Heading",
+        font=heading_font,
+        background=TABLE_HEADER_BG,
+        foreground=TABLE_HEADER_FG,
+        relief="flat",
+    )
+    style.map(
+        f"{style_name}.Heading",
+        background=[("active", TABLE_HEADER_BG), ("pressed", TABLE_HEADER_BG)],
+        foreground=[("active", TABLE_HEADER_FG), ("pressed", TABLE_HEADER_FG)],
+    )
+    style.map(
+        style_name,
+        background=[("selected", TABLE_SELECTED_BG)],
+        foreground=[("selected", TABLE_SELECTED_FG)],
+    )
+    tree.configure(style=style_name)
+    configure_treeview_zebra_tags(tree)
+    return style
+
+
+def configure_treeview_zebra_tags(tree: ttk.Treeview) -> None:
+    """Register alternating row color tags on a Treeview."""
+
+    tree.tag_configure("even", background=TABLE_ROW_EVEN)
+    tree.tag_configure("odd", background=TABLE_ROW_ODD)
+
+
+def zebra_tag(index: int) -> str:
+    """Return the alternating row tag for the given zero-based index."""
+
+    return "even" if index % 2 == 0 else "odd"
+
+
+def merge_tags(*tags: str) -> tuple[str, ...]:
+    """Return non-empty tags preserving order."""
+
+    return tuple(tag for tag in tags if tag)
+
+
+def apply_tksheet_visual_style(sheet: Any) -> None:
+    """Apply best-effort header contrast and zebra rows to a tksheet widget."""
+
+    try:
+        sheet.set_options(
+            header_bg=TABLE_HEADER_BG,
+            header_fg=TABLE_HEADER_FG,
+            header_selected_cells_bg=TABLE_HEADER_BG,
+            header_selected_cells_fg=TABLE_HEADER_FG,
+            table_bg=TABLE_ROW_EVEN,
+            table_fg="#111827",
+            selected_rows_bg=TABLE_SELECTED_BG,
+            selected_rows_fg=TABLE_SELECTED_FG,
+            selected_cells_bg=TABLE_SELECTED_BG,
+            selected_cells_fg=TABLE_SELECTED_FG,
+        )
+    except Exception:
+        pass
+
+
+def apply_tksheet_zebra(sheet: Any, row_count: int) -> None:
+    """Apply alternating row colors to a tksheet widget when supported."""
+
+    try:
+        sheet.dehighlight_rows(redraw=False)
+    except Exception:
+        pass
+    for row_index in range(row_count):
+        try:
+            sheet.highlight_rows(
+                rows=[row_index],
+                bg=TABLE_ROW_EVEN if row_index % 2 == 0 else TABLE_ROW_ODD,
+                redraw=False,
+            )
+        except Exception:
+            break
+    try:
+        sheet.redraw()
+    except Exception:
+        pass