zoukankan      html  css  js  c++  java
  • Windows API-----top level window

    原文地址:

    http://blog.163.com/cumt_xl/blog/static/19071504420136911838683/

    Q: What is a top-level window?


    A: A top-level window is a window that is not child, i.e. it has not WS_CHILD style set.

    Notes

      • unlike the child windows, a top-level window can be displayed anywhere in the screen;
      • many definitions state that a top-level window is "a window that has no parent"
        that is correct but can lead in a confusion: many people think that every window which is created passing a valid hWndParent in CreateWindow(Ex) "has a parent" then, according to the definition it is not top-level
        in fact hWndParent may be either a handle to parent or owner window; 
        if hWndParent is a valid window handle and WS_CHILD style is not set, then we have a top-level owned window;
      • top-level window can or can not be owned but is never a child; further we can say that it can have an owner but never has a parent.
      • top-level windows can be either overlapped windows (having WS_OVERLAPPED style and generally used as application main window) or popup windows (having WS_POPUP style, usually temporary windows like message boxes and dialogs);
      • the coordinates used in CreateWindow(Ex), MoveWindow, SetWindowPos, and so on are always scren coordinates (relative to top-left corner of the screen).
  • 相关阅读:
    linux下apache(httpd)安装部署
    基于redis分布式缓存实现(新浪微博案例)
    python--字典
    django(四)
    django(三)
    django(二)
    django(一)
    053(八十)
    053(七十九)
    053(七十八)
  • 原文地址:https://www.cnblogs.com/dongling/p/5570855.html
Copyright © 2011-2022 走看看