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/*
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代码编写&本篇文档编写 by AZX
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主要实现内容:
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1.注册一个窗口
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2.在窗口中绘制控件，并实现最简单的交互(输入字符串并设置文本为输入的字符串)
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可参考文档:
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https://learn.microsoft.com/zh-cn/windows/win32
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https://learn.microsoft.com/zh-cn/windows/win32/controls
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https://learn.microsoft.com/zh-cn/windows/win32/api/winuser
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*/
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <memory.h>
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#include <tchar.h>
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//设置类名&窗口名全局变量
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const wchar_t CLASS_NAME[] = L"WindowsSystemTest";
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const wchar_t WINDOW_NAME[] = L"WindowsSystemTest";
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HWND hwnd, edit1, button1, static1;
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LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
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void OnSize(HWND hwnd, int width, int height);
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int WINAPI wWinMain(
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  HINSTANCE hInstance,
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  HINSTANCE hPrevInstance,
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  PWSTR pCmdLine,
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  int nCmdShow)
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{
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  //设置窗口类
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  WNDCLASS WndCLASS = {};
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  WndCLASS.lpfnWndProc = WindowProc; // 使用自定义的过程函数,如果你懒得写这个函数,可以填 DefWindowProc 使用默认过程,这样就可以删掉WindowProc函数
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  WndCLASS.hInstance = hInstance;
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  WndCLASS.lpszClassName = CLASS_NAME;
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  WndCLASS.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
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  //注册窗口类
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  RegisterClass(&WndCLASS);
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  //创建主窗口,以 CLASS_NAME 为类名，WINDOW_NAME 为窗口名，使用默认的大小和位置，和默认的窗口样式(WS_OVERLAPPEDWINDOW)
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  hwnd = CreateWindowExW(
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    0L,
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    CLASS_NAME,
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    WINDOW_NAME,
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    WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
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    CW_USEDEFAULT,
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    CW_USEDEFAULT,
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    CW_USEDEFAULT,
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    CW_USEDEFAULT,
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    NULL,
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    NULL,
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    hInstance,
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    NULL);
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  //检查窗口是否被成功创建，如果是，显示出来，否则退出
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  if (!hwnd) return 0;
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  else ShowWindow(hwnd, nCmdShow);
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  //获取主窗口字体，方便统一字体
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  int dpi = GetDpiForWindow(hwnd);
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  int pt = 10;
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  HFONT hFont = CreateFontW(-MulDiv(pt, dpi, 72),
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    0, 0, 0, FW_NORMAL, 0, 0, 0,
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    DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
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    CLEARTYPE_QUALITY, VARIABLE_PITCH | FF_DONTCARE,
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    L"Segoe UI");
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  //创建窗口控件
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  edit1 = CreateWindowW(L"EDIT", L"请输入文本",
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    WS_CHILD | WS_VISIBLE | ES_MULTILINE,
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    10, 10, 114, 20, hwnd, (HMENU)2, hInstance, NULL);
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  button1 = CreateWindowW(L"BUTTON", L"确定",
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    WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | WS_TABSTOP,
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    10, 35, 114, 20, hwnd, (HMENU)1, hInstance, NULL);
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  static1 = CreateWindowW(L"static", L"文本",
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    WS_CHILD | WS_VISIBLE | SS_CENTER,
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    10, 60, 114, 20, hwnd, (HMENU)3, hInstance, NULL);
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  //为每个控件统一主窗口的字体
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  SendMessage(edit1, WM_SETFONT, (WPARAM)hFont, TRUE);
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  SendMessage(button1, WM_SETFONT, (WPARAM)hFont, TRUE);
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  SendMessage(static1, WM_SETFONT, (WPARAM)hFont, TRUE);
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  //重复执行判断逻辑知道窗口关闭
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  MSG msg;
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  while (GetMessage(&msg, NULL, 0, 0))
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  {
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    TranslateMessage(&msg);
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    DispatchMessage(&msg);
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    //这里添加窗口操作的逻辑
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  }
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  return 0;
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}
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LRESULT CALLBACK WindowProc(
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  HWND hwnd,
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  UINT uMsg,
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  WPARAM wParam,
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  LPARAM lParam)
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{
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  switch (uMsg) {
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    //控件传入信息
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    case WM_COMMAND:
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    {
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      switch (LOWORD(wParam)) {
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      case 1: //1为按钮的ID
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        //读取并设置文字内容
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        wchar_t EditText[114];
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        GetWindowTextW(edit1, EditText, 114);
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        SetWindowTextW(static1, EditText);
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        break;
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      }
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      return 0;
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    }
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    //窗口绘制
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    case WM_PAINT:
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    {
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      PAINTSTRUCT ps;
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      HDC hdc = BeginPaint(hwnd, &ps);
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      //这里填入窗口绘制的逻辑
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      EndPaint(hwnd, &ps);
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      return 0;
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    }
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    // 窗口关闭
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    case WM_CLOSE:
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    {
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      if (MessageBox(hwnd, L"确定退出?", WINDOW_NAME, MB_OKCANCEL) == IDOK)
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        DestroyWindow(hwnd);
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      return 0;
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    }
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    //窗口销毁
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    case WM_DESTROY:
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    {
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      PostQuitMessage(0);
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      return 0;
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    }
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    //其余的信息逻辑
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  }
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  //对于这个函数没有处理的一些消息，由默认方式处理
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  return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}