一个登录的例子
screen
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用户名：                                密码：                                    
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用户名：hzt                             密码：********                         ~
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code:


void state_login_prompt(Client& client, Event event)
{
    if (event.type == EV_INIT) {
        client.clear();
        client.drawFile("issue");

        EntryField* w_username = new EntryField();
        EntryField* w_password = new EntryField();

        w_username->setMaxLength(20);
        w_username->setLabel("用户名：");
        w_username->setStyle(BG_BLU B_WHT);
        w_username->setStartRow(client.height - 1);
        w_username->setStartCol(0);
        w_username->update(client);

        w_password->setMaxLength(20);
        w_password->setLabel("密码：");
        w_password->setStyle(BG_BLU B_WHT);
        w_password->setStartRow(client.height - 1);
        w_password->setStartCol(40);
        w_password->setMask('*');
        w_password->update(client);

        client.addWidget("w_username", w_username);
        client.addWidget("w_password", w_password);
        client.focusWidget("w_username");
    }

    // focus widget event
    switch (event.type) {
    case EV_KEY_UP:
    case EV_KEY_PAGE_UP:
        if (!client.activeWidgetName().equals("w_username")) {
            client.focusWidget("w_username");
        }
        return;
    case EV_KEY_DOWN:
    case EV_KEY_PAGE_DOWN:
        if (!client.activeWidgetName().equals("w_password")) {
            client.focusWidget("w_password");
        }
        return;
    default:
        break;
    }

    int login_times = client.session.getIntProperty("login_times");
    int response = client.processWidgetEvent(event);
    switch (response) {
    case R_DONE:
        if (client.activeWidgetName().equals("w_username")) {
            client.name = ((EntryField*)client.activeWidget())->text();
            client.focusWidget("w_password");
        }
        else if (client.activeWidgetName().equals("w_password")) {
            String password = ((EntryField*)client.activeWidget())->text();
            if (BBS::instance()->checkUser(client.name, password)) {
                BBS::instance()->loadUserData(client);
                client.transit(state_go_online);
            }
            else {
                client.session.setIntProperty("login_times", ++login_times);
                client.print(NRM B_RED "\n密码错误...(%d)\n", login_times);
                if (login_times >= 3) {
                    Debug("login_times(%d)", login_times);
                    client.disconnect();
                    break;
                }
                client.activeWidget()->reset(client);
                client.focusWidget("w_username");
                client.activeWidget()->reset(client);
            }
        }
        break;

    case R_BREAK:
        client.disconnect();
        break;
        return;
    }
}
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FROM 202.120.174.78