SDL_WindowEventID

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本文介绍SDL库中窗口事件的处理方法及各种窗口事件的含义，包括窗口显示、隐藏、尺寸变化等，并提供了一个完整的代码示例来展示如何响应这些事件。

窗口事件枚举值

可能值

SDL_WINDOWEVENT_NONE	never used
SDL_WINDOWEVENT_SHOWN	窗口被显示
SDL_WINDOWEVENT_HIDDEN	窗口被隐藏
SDL_WINDOWEVENT_EXPOSED	窗口被显露出来且必须被重画（梦维：这种情况一般是窗口被其他窗口挡住，然后被遮挡部分又显示出来时）
SDL_WINDOWEVENT_MOVED	window has been moved to data1, data2
SDL_WINDOWEVENT_RESIZED	window has been resized to data1xdata2
SDL_WINDOWEVENT_SIZE_CHANGED	窗口大小改变, 不论是用户拖动改变大小还是调用了改变窗口大小的API
SDL_WINDOWEVENT_MINIMIZED	窗口被最小化
SDL_WINDOWEVENT_MAXIMIZED	窗口被最大化
SDL_WINDOWEVENT_RESTORED	窗口返回普通大小并返回原来位置
SDL_WINDOWEVENT_ENTER	窗口得到鼠标焦点
SDL_WINDOWEVENT_LEAVE	窗口失去鼠标焦点
SDL_WINDOWEVENT_FOCUS_GAINED	窗口得到键盘焦点
SDL_WINDOWEVENT_FOCUS_LOST	窗口失去键盘焦点
SDL_WINDOWEVENT_CLOSE	窗口管理器请求窗口关闭

代码示例

#include "SDL.h"
 
int 
main(int, 
char**)  {
  int
width = 640;
  int
height = 480;
   
  if
(SDL_Init(SDL_INIT_VIDEO) != 0)  {
    return
1;
  }
  atexit(SDL_Quit);
   
  SDL_Window* window = SDL_CreateWindow(
    "Example", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
    width, height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE
  );
  Uint32 windowID = SDL_GetWindowFromID(window);
   
  while
(true)  {
    SDL_Event event;
    while
(SDL_PollEvent(&event))  {
      switch
(event.type)  {
         
        case
SDL_WINDOWEVENT:  {
          if
(event.window.windowID == windowID)  {
            switch
(event.window.event)  {
               
              case
SDL_WINDOWEVENT_SIZE_CHANGED:  {
                width = event.window.data1;
                height = event.window.data2;
                break;
              }
               
              case
SDL_WINDOWEVENT_CLOSE:  {
                event.type = SDL_QUIT;
                SDL_PushEvent(&event);
                break;
              }
               
            }
          }
          break;
        }
         
        case
SDL_QUIT:  {
          return
0;
        }
         
        /* ... */
         
      }
    }
     
    /* ... */
     
    SDL_Sleep(1);
  }
}