Method OnButtonClicked

engine/Poseidon/UI/OptionsUIImpl.cpp:595–669

        }
        preview = MissionLanguageDetector::DetectPreview(bank);
        filename = GetOverviewFile(bank);
    }
    else
    {
        preview = MissionLanguageDetector::DetectPreview(directory + RString("\\"));
        filename = GetOverviewFile(directory + RString("\\"));
    }
    if (filename.GetLength() > 0 || preview.missionViewDistance.has_value() ||
        MissionLanguageDetector::FormatTextLanguages(preview.languages) != RString("-") ||
        MissionLanguageDetector::FormatVoiceLanguages(preview.languages) != RString("-"))
    {
        LoadMissionPreviewHtml(html, filename, preview);
    }

    // update buttons
    RString dir = GetMissionSaveDirectory(_directory + mission);
    EnsureContinueSave(dir);
    RString save = dir + RString("continue.fps");
    if (QIFStream::FileExists(save))
    {
        CActiveText* ctrl = static_cast<CActiveText*>(GetCtrl(IDC_OK));
        if (ctrl)
        {
            ctrl->SetText(LocalizeString(kSingleRestartKey));
        }
        ctrl = static_cast<CActiveText*>(GetCtrl(IDC_SINGLE_LOAD));
        if (ctrl)
        {
            int day, month, year, hour, minute;
            if (getFileLocalTime(save, day, month, year, hour, minute))
            {
                char buffer[256];
                snprintf(buffer, sizeof(buffer), LocalizeString(kSingleResumeKey), month, day, year, hour, minute);
                ctrl->SetText(buffer);
                ctrl->ShowCtrl(true);
            }
        }
    }
    else
    {
        CActiveText* ctrl = static_cast<CActiveText*>(GetCtrl(IDC_OK));
        if (ctrl)
        {
            ctrl->SetText(LocalizeString(kSinglePlayKey));
        }
        ctrl = static_cast<CActiveText*>(GetCtrl(IDC_SINGLE_LOAD));
        if (ctrl)
        {
            ctrl->ShowCtrl(false);
        }
    }
}

void DisplaySingleMission::OnChangeDifficulty()
{
    CActiveText* ctrl = dynamic_cast<CActiveText*>(GetCtrl(IDC_SINGLE_DIFF));
    if (!ctrl)
    {