更改 Win32 窗口的父级时为什么要圆角? [英] Why rounded corners when changing a Win32 window's parent?

问题描述

我正在尝试学习如何使顶级 Win32 窗口成为另一个窗口的子窗口.

I'm trying to learn how to make a top-level Win32 window become a child of another window.

当我改变一个窗口的父级时，我仍然得到丑陋的圆角，就好像它是一个带有圆形标题栏的顶级窗口.为什么?我该如何解决这个问题?(我无法获得 WM_UPDATEUISTATE 的帮助，但我也不知道如何正确使用它.)

When I change a window's parent, I still get ugly rounded corners, as though it was a top-level window with a rounded title bar. Why? And how do I fix this? (I couldn't get WM_UPDATEUISTATE to help, but I'm not sure how to use it correctly either.)

#include <tchar.h>
#include <windows.h>
#include <commctrl.h>
int _tmain()
{
    WNDCLASS wndClass = {
        0, &DefWindowProc, 0, 0, NULL, NULL, LoadCursor(NULL, IDC_ARROW),
        GetSysColorBrush(COLOR_3DFACE), NULL, TEXT("MyWindowClass")
    };
    ATOM atom = RegisterClass(&wndClass);
    HWND hWnd = CreateWindow(MAKEINTATOM(atom), TEXT("Win"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, NULL, NULL);
    HWND hWndChild = CreateWindowEx(WS_EX_CLIENTEDGE,
        WC_EDIT, TEXT("Control"), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        10, 10, 86, 24, NULL, NULL, NULL, NULL);
    SetParent(hWndChild, hWnd);                     // Change the parent
    SetWindowLong(hWndChild, GWL_STYLE,             // Set child styles
        GetWindowLong(hWndChild, GWL_STYLE)
            & ~(WS_OVERLAPPED | WS_POPUP | WS_CAPTION | WS_SYSMENU |
                WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX)
            | WS_CHILDWINDOW);
    SetWindowPos(hWndChild, NULL, 0, 0, 0, 0,       // Refresh
        SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE
            | SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_FRAMECHANGED);
    BOOL bRet;
    MSG msg;
    while ((bRet = GetMessage(&msg, hWnd, 0, 0)) != 0 && bRet != -1)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

推荐答案

这似乎在原则上是可能的，但实际上很难做到正确"(根据 Raymond 的评论).

It seems like this is possible in principle but difficult to get 'right' practically (according to Raymond's comment).

我发现 SetWindowRgn(hWnd, NULL, TRUE); 可以解决问题，但我认为它不正确——我可能遗漏了其他一些东西.所以正确的解决方案可能是在一开始就正确构造对象.

I found that SetWindowRgn(hWnd, NULL, TRUE); does the trick, but I don't think it's correct -- there might be other things I've missed. So the correct solution is probably to just construct the object correctly at the beginning.

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