ModifyStyle()调用不起作用

在使用WTL的CListBox子类化过程中遇到问题,尝试使用ModifyStyle(0, LBS_OWNERDRAWFIXED)修改样式无效。原因是某些风格如LBS_HASSTRINGS | LBS_OWNERDRAWFIXED | LBS_OWNERDRAWVARIABLE只能在控件创建时设定,后续动态修改不会生效。解决方法包括动态创建控件或在创建ListBox时直接指定所需风格。参考Code Project的解释,对于需要动态切换的风格,可能需要新建并替换控件,或者使用两个覆盖的ListBox来实现。" 114955216,10538668,使用Java生成Outlook日程:多事件.ICS文件示例,"['Java开发', '日历同步', 'Outlook集成', '数据格式', '赛事管理']

现象:在使用WTL做CListBox子类化时,使用 ModifyStyle(0, LBS_OWNERDRAWFIXED)不起作用;

原因:并不是所有的风格都可以动态利用ModifyStyle/ModifyStyleEx()函数增加和去除,有些风格比如 LBS_HASSTRINGS | LBS_OWNERDRAWFIXED| LBS_OWNERDRAWVARIABLE 就只能在创建窗口的时候指定(其后再增加是无效的),也就是说你只能创建的之前指定。

解决:自己动态创建控件,或在待子类化的ListBox控件中指定属性(如LBS_HASSTRINGS | LBS_OWNERDRAWFIXED| LBS_OWNERDRAWVARIABLE )

 

附:

1) code   project中的解释

It   is   not   possible   to   change   these   styles   at   runtime   even   though   ModifyStyle()   may   give   the   impression   it   does.   If   you   want   turn   the   Sort   style&n

MFC开发过程序所需的ModifyStyle(needDelStyle,needAddStyle,SWP_FRAMECHANGED); Sytel: WS_BORDER Creates a window that has a border. WS_CAPTION Creates a window that has a title bar (implies the WS_BORDER style). Cannot be used with the WS_DLGFRAME style. WS_CHILD Creates a child window. Cannot be used with the WS_POPUP style. WS_CHILDWINDOW Same as the WS_CHILD style. WS_CLIPCHILDREN Excludes the area occupied by child windows when you draw within the parent window. Used when you create the parent window. WS_CLIPSIBLINGS Clips child windows relative to each other; that is, when a particular child window receives a paint message, the WS_CLIPSIBLINGS style clips all other overlapped child windows out of the region of the child window to be updated. (If WS_CLIPSIBLINGS is not given and child windows overlap, when you draw within the client area of a child window, it is possible to draw within the client area of a neighboring child window.) For use with the WS_CHILD style only. WS_DISABLED Creates a window that is initially disabled. WS_DLGFRAME Creates a window with a double border but no title. WS_GROUP Specifies the first control of a group of controls in which the user can move from one control to the next with the arrow keys. All controls defined with the WS_GROUP style FALSE after the first control belong to the same group. The next control with the WS_GROUP style starts the next group (that is, one group ends where the next begins). WS_HSCROLL Creates a window that has a horizontal scroll bar. WS_ICONIC Creates a window that is initially minimized. Same as the WS_MINIMIZE style. WS_MAXIMIZE Creates a window of maximum size. WS_MAXIMIZEBOX Creates a window that has a Maximize button. WS_MINIMIZE Creates a window that is initially minimized. For use with the WS_OVERLAPPED style only. WS_MINIMIZEBOX Creates a window that has a Minimize button. WS_OVERLAPPED Creates an overlapped window. An overlapped window usually has a caption a
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