libsdl中文输入法候选列表不显示解决方案

libsdl输入中文时输入法不显示，将WM_IME_SETCONTEXT事件处理给注释即可。

WM_IME_SETCONTEXT

If the application draws the composition window, the default IME window does not have to show its composition window. In this case, the application must clear the ISC_SHOWUICOMPOSITIONWINDOW value from the lParam parameter before passing the message to DefWindowProc or ImmIsUIMessage. To display a certain user interface window, an application should remove the corresponding value so that the IME will not display it.

修改SDL_windowskeyboard.c找到IME_HandleMessage函数改为以下代码即可。

SDL_bool
IME_HandleMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM *lParam, SDL_VideoData *videodata)
{
    SDL_bool trap = SDL_FALSE;
    HIMC himc = 0;
    if (!videodata->ime_initialized || !videodata->ime_available || !videodata->ime_enabled)
        return SDL_FALSE;

    switch (msg) {
    case WM_INPUTLANGCHANGE:
        IME_InputLangChanged(videodata);
        break;
    //输入法候选框不显示
    //case WM_IME_SETCONTEXT:
    //    *lParam = 0;
    //    break;
    case WM_IME_STARTCOMPOSITION:
        trap = SDL_TRUE;
        break;
    case WM_IME_COMPOSITION:
        trap = SDL_TRUE;
        himc = ImmGetContext(hwnd);
        if (*lParam & GCS_RESULTSTR) {
            IME_GetCompositionString(videodata, himc, GCS_RESULTSTR);
            IME_SendInputEvent(videodata);
        }
        if (*lParam & GCS_COMPSTR) {
            if (!videodata->ime_uiless)
                videodata->ime_readingstring[0] = 0;

            IME_GetCompositionString(videodata, himc, GCS_COMPSTR);
            IME_SendEditingEvent(videodata);
        }
        ImmReleaseContext(hwnd, himc);
        break;
    case WM_IME_ENDCOMPOSITION:
        videodata->ime_composition[0] = 0;
        videodata->ime_readingstring[0] = 0;
        videodata->ime_cursor = 0;
        SDL_SendEditingText("", 0, 0);
        break;
    case WM_IME_NOTIFY:
        switch (wParam) {
        case IMN_SETCONVERSIONMODE:
        case IMN_SETOPENSTATUS:
            IME_UpdateInputLocale(videodata);
            break;
        case IMN_OPENCANDIDATE:
        case IMN_CHANGECANDIDATE:
            if (videodata->ime_uiless)
                break;

            trap = SDL_TRUE;
            IME_ShowCandidateList(videodata);
            himc = ImmGetContext(hwnd);
            if (!himc)
                break;

            IME_GetCandidateList(himc, videodata);
            ImmReleaseContext(hwnd, himc);
            break;
        case IMN_CLOSECANDIDATE:
            trap = SDL_TRUE;
            IME_HideCandidateList(videodata);
            break;
        case IMN_PRIVATE:
            {
                DWORD dwId = IME_GetId(videodata, 0);
                IME_GetReadingString(videodata, hwnd);
                switch (dwId)
                {
                case IMEID_CHT_VER42:
                case IMEID_CHT_VER43:
                case IMEID_CHT_VER44:
                case IMEID_CHS_VER41:
                case IMEID_CHS_VER42:
                    if (*lParam == 1 || *lParam == 2)
                        trap = SDL_TRUE;

                    break;
                case IMEID_CHT_VER50:
                case IMEID_CHT_VER51:
                case IMEID_CHT_VER52:
                case IMEID_CHT_VER60:
                case IMEID_CHS_VER53:
                    if (*lParam == 16
                        || *lParam == 17
                        || *lParam == 26
                        || *lParam == 27
                        || *lParam == 28)
                        trap = SDL_TRUE;
                    break;
                }
            }
            break;
        default:
            trap = SDL_TRUE;
            break;
        }
        break;
    }
    return trap;
}