flutter开发桌面应用实现窗体透明

1.使用bitsdojo_window插件：

使用命令添加

dart pub add bitsdojo_window

2.在 windows/runner/main.cpp 中进行窗口透明设置：

#include <flutter/dart_project.h>
#include <flutter/flutter_view_controller.h>
#include <windows.h>

#include "flutter_window.h"
#include "utils.h"

// 添加的代码
#include<bitsdojo_window_windows/bitsdojo_window_plugin.h>
auto bdw = bitsdojo_window_configure(BDW_CUSTOM_FRAME | BDW_HIDE_ON_STARTUP);

void EnableTransparency(HWND hwnd) {
    SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_LAYERED);
    COLORREF colorKey = RGB(255, 255, 255);
    BYTE alpha = 128; // 设置透明度（0-256）
    SetLayeredWindowAttributes(hwnd, colorKey, alpha, LWA_ALPHA);
}
// 到这里结束

int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
                      _In_ wchar_t *command_line, _In_ int show_command) {
  // Attach to console when present (e.g., 'flutter run') or create a
  // new console when running with a debugger.
//...省略中间的代码
  // 添加的代码
EnableTransparency(window.GetHandle());
// 到这里结束
window.SetQuitOnClose(true);

  ::MSG msg;
  while (::GetMessage(&msg, nullptr, 0, 0)) {
    ::TranslateMessage(&msg);
    ::DispatchMessage(&msg);
  }

  ::CoUninitialize();
  return EXIT_SUCCESS;
}

3.设置页面背景为透明：

Scaffold(
        backgroundColor: Colors.transparent,
        body: Container()
        )

4.实现的效果：