feat: add column sorting functionality to material validation table

Add sorting capability for "选择" and "材料名称" columns in the CheckboxTreeview:
- Click column header to cycle through: asc (↑) → desc (↓) → unsort
- Sort "选择" column by checkbox state (checked/unchecked)
- Sort "材料名称" column alphabetically
- Preserve checkbox states during sorting using move() instead of delete+insert
- Separate event handlers for cell clicks and heading clicks

Implementation details:
- Added 6 new helper methods to CheckboxTreeview class
- Store original headings to properly display sort arrows
- Use identify_region() to distinguish between cell and heading clicks
- Column index conversion (#1/#2) to column identifiers

The sorting is a pure frontend feature with no database changes.
Available to all users without permission restrictions.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

gui/material_validation_tab.py

@@ -45,14 +45,26 @@ class CheckboxTreeview(ttk.Treeview):
         self.checkbox_column = "选择"
         self.on_checkbox_change = on_checkbox_change  # checkbox 状态改变回调
 
+        # 排序状态
+        self.sort_column = None       # 当前排序列的列标识符
+        self.sort_direction = None    # 'asc', 'desc', 或 None
+        self.sortable_columns = ["选择", "材料名称"]  # 可排序的列白名单
+        self.original_headings = {}   # 存储原始列标题文本（不含箭头）
+
+        # 存储原始列标题（延迟执行以确保标题已设置）
+        self.after(100, self._store_original_headings)
+
         # 绑定点击事件
         self.bind("<Button-1>", self._on_click)
+        # 绑定表头点击事件
+        self.bind("<ButtonRelease-1>", self._on_heading_click)
 
     def _on_click(self, event):
         """处理点击事件，切换 checkbox 状态"""
         # 获取点击位置对应的 item 和 column
         region = self.identify_region(event.x, event.y)
 
+        # 仅处理单元格点击，不处理表头点击
         if region == "cell":
             column = self.identify_column(event.x)
             item = self.identify_row(event.y)
@@ -127,6 +139,115 @@ class CheckboxTreeview(ttk.Treeview):
                 del self.checkboxes[item]
         super().delete(*items)
 
+    def _store_original_headings(self):
+        """存储原始列标题文本（不含箭头）"""
+        for col in self['columns']:
+            self.original_headings[col] = self.heading(col, 'text')
+
+    def _get_column_id_from_column_index(self, column_index):
+        """将列索引 ('#1', '#2') 转换为列标识符
+
+        Args:
+            column_index: 列索引字符串，如 '#1', '#2'
+
+        Returns:
+            列标识符，如 '选择', '材料名称'
+        """
+        index = int(column_index[1:]) - 1
+        columns = self['columns']
+        if 0 <= index < len(columns):
+            return columns[index]
+        return None
+
+    def _on_heading_click(self, event):
+        """处理表头点击事件，触发排序"""
+        region = self.identify_region(event.x, event.y)
+
+        if region == "heading":
+            column = self.identify_column(event.x)
+            column_id = self._get_column_id_from_column_index(column)
+
+            # 仅对可排序列进行排序
+            if column_id in self.sortable_columns:
+                self._toggle_sort(column_id)
+
+    def _toggle_sort(self, column_id):
+        """切换指定列的排序状态
+
+        Args:
+            column_id: 列标识符（如 '选择', '材料名称'）
+        """
+        # 确定新的排序方向
+        if self.sort_column == column_id:
+            # 同一列：asc -> desc -> None
+            if self.sort_direction == 'asc':
+                new_direction = 'desc'
+            elif self.sort_direction == 'desc':
+                new_direction = None
+            else:
+                new_direction = 'asc'
+        else:
+            # 不同列：从升序开始
+            new_direction = 'asc'
+
+        # 应用排序
+        if new_direction:
+            self._sort_by_column(column_id, new_direction)
+            self.sort_column = column_id
+            self.sort_direction = new_direction
+        else:
+            # 清除排序状态
+            self.sort_column = None
+            self.sort_direction = None
+
+        # 更新表头显示
+        self._update_heading_display()
+
+    def _sort_by_column(self, column_id, direction):
+        """按指定列和方向排序
+
+        Args:
+            column_id: 列标识符
+            direction: 'asc' 或 'desc'
+        """
+        # 收集所有项目及其数据和复选框状态
+        items_data = []
+        for item in self.get_children():
+            values = self.item(item, "values")
+            checkbox_state = self.checkboxes.get(item, False)
+            items_data.append({
+                'item_id': item,
+                'values': values,
+                'checked': checkbox_state
+            })
+
+        # 根据列和方向排序
+        if column_id == "选择":
+            # 按复选框状态排序（选中在前，未选中在后）
+            items_data.sort(key=lambda x: x['checked'], reverse=(direction == 'desc'))
+        elif column_id == "材料名称":
+            # 按材料名称排序
+            items_data.sort(
+                key=lambda x: str(x['values'][1]) if len(x['values']) > 1 else "",
+                reverse=(direction == 'desc')
+            )
+
+        # 重新排列项目顺序（使用 detach 和 move 保留项目ID和状态）
+        for item_data in items_data:
+            self.move(item_data['item_id'], '', 'end')
+
+    def _update_heading_display(self):
+        """更新列标题显示（添加/移除排序箭头）"""
+        for col in self['columns']:
+            original = self.original_headings.get(col, col)
+            if col == self.sort_column:
+                # 添加排序箭头
+                arrow = " ↑" if self.sort_direction == 'asc' else " ↓"
+                self.heading(col, text=original + arrow)
+            else:
+                # 移除箭头，显示原始标题
+                self.heading(col, text=original)
+
 
 class MaterialValidationTab(ttk.Frame):
     """物料校验标签页"""