feat: 优化文件保存对话框并增强系统稳定性

- 重新启用run.io_bound()调用，使用后台线程执行PowerShell脚本
- 为所有文件保存操作添加按钮防重复点击功能
- 新增win32_helper模块，提供Win32 API和COM接口的文件对话框
- 简化导出最佳方案DXF的代码结构
- 改进异步操作和错误处理机制

gui.py

@@ -10,7 +10,7 @@ matplotlib.use("Agg")
 import matplotlib.backends.backend_svg
 import matplotlib.pyplot as plt
 import pandas as pd
-from nicegui import app, events, ui
+from nicegui import app, events, ui, run
 
 from main import (
     compare_design_methods,
@@ -347,7 +347,7 @@ def index():
         except Exception as ex:
             ui.notify(f"上传处理失败: {ex}", type="negative")
 
-    async def save_file_with_dialog(filename, callback, file_filter="All files (*.*)"):
+    async def save_file_with_dialog(filename, callback, file_filter="All files (*.*)", sender=None):
         """
         跨平台文件保存助手。
         如果是原生模式，弹出系统保存对话框。
@@ -356,77 +356,84 @@ def index():
         :param filename: 默认文件名
         :param callback: 接收文件路径并执行保存操作的函数 (filepath) -> None
         :param file_filter: 格式如 "Excel Files (*.xlsx)"
+        :param sender: 触发该操作的 UI 组件，用于在操作期间禁用以防重复点击
         """
-        # 方案：使用 PowerShell 弹出原生保存对话框 (仅限 Windows)
-        # 这完全避免了 Python UI 库 (Tkinter/PyWebview) 的线程冲突和 PicklingError
-        import platform
-        import subprocess
+        if sender:
+            sender.disable()
+        try:
+            # 方案：使用 PowerShell 弹出原生保存对话框 (仅限 Windows)
+            import platform
+            import subprocess
 
-        if platform.system() == "Windows":
-            try:
-                # 构建 PowerShell 脚本
-                # 注意：过滤器格式为 "描述|*.ext|所有文件|*.*"
-                ps_filter = file_filter.replace("(", "|").replace(")", "")
-                if "|" not in ps_filter:
-                    ps_filter += f"|{os.path.splitext(filename)[1] or '*.*'}"
-                
-                # 简单清洗 filter 字符串以适应 PowerShell (e.g., "Excel Files *.xlsx" -> "Excel Files|*.xlsx")
-                # 这里做一个简化的映射，确保格式正确
-                if "Excel" in file_filter:
-                    ps_filter = "Excel Files (*.xlsx)|*.xlsx|All Files (*.*)|*.*"
-                elif "DXF" in file_filter:
-                    ps_filter = "DXF Files (*.dxf)|*.dxf|All Files (*.*)|*.*"
-                elif "ZIP" in file_filter:
-                    ps_filter = "ZIP Archives (*.zip)|*.zip|All Files (*.*)|*.*"
-                else:
-                    ps_filter = "All Files (*.*)|*.*"
+            if platform.system() == "Windows":
+                try:
+                    # 构建 PowerShell 脚本
+                    # 注意：过滤器格式为 "描述|*.ext|所有文件|*.*"
+                    ps_filter = file_filter.replace("(", "|").replace(")", "")
+                    if "|" not in ps_filter:
+                        ps_filter += f"|{os.path.splitext(filename)[1] or '*.*'}"
+                    
+                    # 简单清洗 filter 字符串以适应 PowerShell (e.g., "Excel Files *.xlsx" -> "Excel Files|*.xlsx")
+                    # 这里做一个简化的映射，确保格式正确
+                    if "Excel" in file_filter:
+                        ps_filter = "Excel Files (*.xlsx)|*.xlsx|All Files (*.*)|*.*"
+                    elif "DXF" in file_filter:
+                        ps_filter = "DXF Files (*.dxf)|*.dxf|All Files (*.*)|*.*"
+                    elif "ZIP" in file_filter:
+                        ps_filter = "ZIP Archives (*.zip)|*.zip|All Files (*.*)|*.*"
+                    else:
+                        ps_filter = "All Files (*.*)|*.*"
 
-                ps_script = f"""
-                Add-Type -AssemblyName System.Windows.Forms
-                $d = New-Object System.Windows.Forms.SaveFileDialog
-                $d.Filter = "{ps_filter}"
-                $d.FileName = "{filename}"
-                $d.Title = "保存文件"
-                if ($d.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {{
-                    Write-Output $d.FileName
-                }}
-                """
+                    ps_script = f"""
+                    Add-Type -AssemblyName System.Windows.Forms
+                    $d = New-Object System.Windows.Forms.SaveFileDialog
+                    $d.Filter = "{ps_filter}"
+                    $d.FileName = "{filename}"
+                    $d.Title = "保存文件"
+                    if ($d.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {{
+                        Write-Output $d.FileName
+                    }}
+                    """
 
-                # 运行 PowerShell
-                # 使用 startupinfo 隐藏控制台窗口 (防止黑框闪烁)
-                startupinfo = subprocess.STARTUPINFO()
-                startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
-                
-                print("DEBUG: invoking PowerShell SaveFileDialog...")
-                
-                # 在 native 模式下直接同步执行，不使用 run.io_bound()
-                result = subprocess.run(
-                    ["powershell", "-Command", ps_script],
-                    capture_output=True,
-                    text=True,
-                    startupinfo=startupinfo
-                )
-                save_path = result.stdout.strip()
+                    # 运行 PowerShell
+                    # 使用 startupinfo 隐藏控制台窗口 (防止黑框闪烁)
+                    startupinfo = subprocess.STARTUPINFO()
+                    startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+                    
+                    print("DEBUG: invoking PowerShell SaveFileDialog...")
+                    
+                    # 使用 run.io_bound 在后台线程执行，避免阻塞主事件循环
+                    # 这样按钮的禁用状态可以立即同步到前端
+                    result = await run.io_bound(
+                        subprocess.run,
+                        ["powershell", "-Command", ps_script],
+                        capture_output=True,
+                        text=True,
+                        startupinfo=startupinfo
+                    )
+                    save_path = result.stdout.strip()
+                    if save_path:
+                        print(f"DEBUG: PowerShell returned path: {save_path}")
+                        await callback(save_path)
+                        ui.notify(f"文件已保存至: {save_path}", type="positive")
+                        return
+                    else:
+                        print("DEBUG: PowerShell dialog cancelled or empty result.")
+                        # 用户取消，直接返回，不回退
+                        return 
 
-                if save_path:
-                    print(f"DEBUG: PowerShell returned path: {save_path}")
-                    await callback(save_path)
-                    ui.notify(f"文件已保存至: {save_path}", type="positive")
-                    return
-                else:
-                    print("DEBUG: PowerShell dialog cancelled or empty result.")
-                    # 用户取消，直接返回，不回退
-                    return 
+                except Exception as e:
+                    print(f"PowerShell dialog failed: {e}")
+                    # 出错则回退到 ui.download
 
-            except Exception as e:
-                print(f"PowerShell dialog failed: {e}")
-                # 出错则回退到 ui.download
-
-        # 统一回退方案：浏览器下载
-        print("DEBUG: Using ui.download fallback")
-        temp_path = os.path.join(state["temp_dir"], filename)
-        await callback(temp_path)
-        ui.download(temp_path)
+            # 统一回退方案：浏览器下载
+            print("DEBUG: Using ui.download fallback")
+            temp_path = os.path.join(state["temp_dir"], filename)
+            await callback(temp_path)
+            ui.download(temp_path)
+        finally:
+            if sender:
+                sender.enable()
 
     def update_export_buttons():
         if refs["export_row"]:
@@ -468,9 +475,9 @@ def index():
                     # 如果不存在，重新生成
                     export_all_scenarios_to_excel(state["results"], path)
 
-            async def on_click_excel():
+            async def on_click_excel(e):
                 await save_file_with_dialog(
-                    default_excel_name, save_excel, "Excel Files (*.xlsx)"
+                    default_excel_name, save_excel, "Excel Files (*.xlsx)", sender=e.sender
                 )
 
             ui.button(
@@ -479,41 +486,7 @@ def index():
             ).props("icon=download")
 
             # --- 导出推荐方案 DXF ---
-            def export_best_dxf():
-                if state["substation"] is not None:
-                    safe_name = "".join(
-                        [
-                            c
-                            for c in best_res["name"]
-                            if c.isalnum() or c in (" ", "-", "_")
-                        ]
-                    ).strip()
-                    default_name = f"{file_prefix}_best_{safe_name}.dxf"
-
-                    async def save_dxf(path):
-                        export_to_dxf(
-                            best_res["turbines"],
-                            state["substation"],
-                            best_res["eval"]["details"],
-                            path,
-                        )
-
-                    # 包装为 async 任务，并在 NiceGUI 事件循环中执行
-                    async def run_save():
-                        await save_file_with_dialog(
-                            default_name, save_dxf, "DXF Files (*.dxf)"
-                        )
-
-                    # 这里的 export_best_dxf 本身是普通函数，绑定到 on_click
-                    # 但我们需要它执行异步操作。最简单的是让 export_best_dxf 变为 async
-                    # 或者在这里直接调用 run_save (但这在普通函数里不行)
-                    # 更好的方法是将 export_best_dxf 定义为 async，如下所示
-                    return run_save()
-                else:
-                    ui.notify("缺少升压站数据，无法导出 DXF", type="negative")
-
-            # 将 export_best_dxf 改为 async 并重命名，以便直接用作回调
-            async def on_click_best_dxf():
+            async def on_click_best_dxf(e):
                 if state["substation"] is not None:
                     safe_name = "".join(
                         [
@@ -533,7 +506,7 @@ def index():
                         )
 
                     await save_file_with_dialog(
-                        default_name, save_dxf, "DXF Files (*.dxf)"
+                        default_name, save_dxf, "DXF Files (*.dxf)", sender=e.sender
                     )
                 else:
                     ui.notify("缺少升压站数据，无法导出 DXF", type="negative")
@@ -543,7 +516,7 @@ def index():
             ).props("icon=architecture color=accent")
 
             # --- 导出选中方案 DXF ---
-            async def on_click_selected_dxf():
+            async def on_click_selected_dxf(e):
                 if not refs["results_table"] or not refs["results_table"].selected:
                     ui.notify("请先在上方表格中选择一个方案", type="warning")
                     return
@@ -573,7 +546,7 @@ def index():
                         )
 
                     await save_file_with_dialog(
-                        default_name, save_dxf, "DXF Files (*.dxf)"
+                        default_name, save_dxf, "DXF Files (*.dxf)", sender=e.sender
                     )
                 else:
                     ui.notify(
@@ -588,7 +561,7 @@ def index():
             refs["export_selected_btn"].set_text(f"导出选中方案 ({clean_name})")
 
             # --- 导出全部 ZIP ---
-            async def on_click_all_dxf():
+            async def on_click_all_dxf(e):
                 if not state["results"] or state["substation"] is None:
                     ui.notify("无方案数据可导出", type="warning")
                     return
@@ -634,7 +607,7 @@ def index():
                             except:
                                 pass
 
-                await save_file_with_dialog(default_name, save_zip, "ZIP Files (*.zip)")
+                await save_file_with_dialog(default_name, save_zip, "ZIP Files (*.zip)", sender=e.sender)
 
             ui.button("导出全部方案 DXF (ZIP)", on_click=on_click_all_dxf).props(
                 "icon=folder_zip color=secondary"
@@ -688,8 +661,6 @@ def index():
 
     import queue
 
-    from nicegui import run
-
     async def run_analysis():
         if not state["excel_path"]:
             ui.notify("请先上传 Excel 坐标文件！", type="warning")
@@ -879,7 +850,7 @@ def index():
             # 使用 items-stretch 确保所有子元素高度一致
             with ui.row().classes("w-full items-stretch gap-4"):
                 # 1. 导出模板按钮
-                async def export_template():
+                async def export_template(e):
                     import shutil
 
                     from generate_template import create_template
@@ -900,7 +871,7 @@ def index():
                             raise FileNotFoundError("无法生成模板文件")
 
                     await save_file_with_dialog(
-                        "coordinates.xlsx", save_template, "Excel Files (*.xlsx)"
+                        "coordinates.xlsx", save_template, "Excel Files (*.xlsx)", sender=e.sender
                     )
 
                 ui.button("导出 Excel 模板", on_click=export_template).classes(