续上篇：

W801学习笔记二十一：英语背单词学习应用——上

五、处理用户交互

由于英语也是采用了和唐诗一样的《三分钟限时挑战》《五十题竞速挑战》《零错误闯关挑战》，所以用户交互的逻辑和唐诗是一样的。所以，我们抽一个基类，让代码可以重用。

1、抽取基类

StudyBase 

class StudyBase : public IScean
{
	public:
		StudyBase(){};
		virtual ~StudyBase(){};
protected:
		u8 gameMode=0;
		u8 winMode=0;
		u8 isFinished=0;
		u16 correntCount =0;
		u16 wrongCount = 0;
		u32 totalTime=0;
		u32 lastTotalTime=0;
   //×○△□
		const char *controlInfo="EXIT: 返回     SELECT: 重新开始";
		const char *answerInfo="× 选择    ○ 选择    □ 选择    △ 选择";

		u16 answerBGColor[4] = {DBLUE, DRED, DGREEN, BROWN }; 
		
		void startPrepare();
		void errorDelay(u8 t);
		u8 checkFinish();
		void showScore();
		void showTime();
		
		u8 answerTitle[4][8] = {
			{0x20,0xA1,0xC1,0x20,0x25,0x73,0x20, 0x0}, // × %s ,
			{0x20,0xA1,0xF0,0x20,0x25,0x73,0x20, 0x0},
			{0x20,0xA1,0xF5,0x20,0x25,0x73,0x20, 0x0},
			{0x20,0xA1,0xF7,0x20,0x25,0x73,0x20, 0x0}}; 
		
private:
		DisplayOption optionScore = {FONT_SIZE_1516, YELLOW, BLACK, 0, 0};
		DisplayOption optionCorrentCount = {FONT_SIZE_1516, GREEN, BLACK, 0, 0};
		DisplayOption optionWrongCount = {FONT_SIZE_1516, RED, BLACK, 0, 0};
		DisplayOption optionTime = {FONT_SIZE_1516, YELLOW, BLACK, 0, 0};
		DisplayOption optionDeCount = {FONT_SIZE_3232, WHITE, DRED, 1, 0};
		
		DisplayOption optionDelay = {FONT_SIZE_2424, WHITE, DRED, 0, 0};
		
		void finish();

};

StudyBase.cpp

void StudyBase::errorDelay(u8 t){
	for(;t>0;t--){
		Display_String2(400, 50, &optionDelay,"  %d  ",t);
		tls_os_time_delay(1000);
	}
	Display_Fill_Rectangle2(400, 50, 80, 80, BLACK);
}


u8 StudyBase::checkFinish(){
	switch (winMode) {
		case 1:
		if(totalTime > 180000) {
			finish();
			return 1;
		}
		break;
		case 2:
		if(correntCount+ wrongCount == 50) {
			finish();
			return 1;
		}
		break;
		case 3:
		if(wrongCount>0) {
			finish();
			return 1;
		}
		break;
	}
	return 0;
}

void StudyBase::finish(){
	isFinished = 1;
	show_status_info(controlInfo);
	optionDeCount.backColor = DBLUE;
	Display_String(Prepare_LOC, &optionDeCount, "   挑 战 结 束   ");
}


void StudyBase::showScore()
{
	int score = correntCount* 60 - wrongCount * 20;
	if(score<0 ) score =0;
	Display_String2(10, 5, &optionScore, "得分: %06d ", score);
	Display_String2(150, 5, &optionCorrentCount, "正确: %04d ", correntCount);
	Display_String2(270, 5, &optionWrongCount, "错误: %04d ", wrongCount);
}

void StudyBase::showTime()
{
	if(lastTotalTime == totalTime/1000){
		return;
	}
	lastTotalTime = totalTime/1000;
		
	if(winMode == 2)
		Display_String2(400, 5, &optionTime, "%02d:%02d", ((180000- totalTime) / 1000) / 60, ((180000- totalTime) / 1000) % 60);
	else
		Display_String2(400, 5, &optionTime, "%02d:%02d", (totalTime / 1000) / 60, (totalTime / 1000) % 60);	
}

2、继承基类

YingYu.h

typedef struct {
	uint16_t question;
    uint16_t answer[4];
	uint8_t ans;
} EngQuestion;

class YingYu : public StudyBase
{
   public:
      YingYu();   
      ~YingYu();  
		SceanResult tick(u32 ticks);
		int scean_init(cJSON*  param);

private:

   EngQuestion *currentQuestion;
   void start();
   void createQuestion();
   void createQuestionMode3();
   void showQuetion();
   void showAnswer();
   void correct();
   void wrong();

	DisplayOption optionQuetion = {FONT_SIZE_2424, YELLOW, BLACK, 1, 1};
	DisplayOption optionZY = {FONT_SIZE_2424, WHITE, BLACK, 1, 1};
	DisplayOption optionAnswer[4] = {
			{FONT_SIZE_1516, WHITE, answerBGColor[0], 0, 1},
			{FONT_SIZE_1516, WHITE, answerBGColor[1], 0, 1},
			{FONT_SIZE_1516, WHITE, answerBGColor[2], 0, 1}, 
			{FONT_SIZE_1516, WHITE, answerBGColor[3], 0, 1}};

	u16 Eng_Answer_LOC_X=20;

	u16 Eng_Answer_LOC_Y[4] = {195,220,245,270};

   char errEngWord[4][40];
   
	unsigned char *DataBuff;
      
	int YingYuCount;
};

3、完成实现

YingYu.cpp

int YingYu::scean_init(cJSON*  param){
	setKeyAdepterIntervalAll(200);
	setKeyAdepterInterval(KEY_GPIO_A, 65535);
	setKeyAdepterInterval(KEY_GPIO_B, 65535);
	setKeyAdepterInterval(KEY_GPIO_C, 65535);
	setKeyAdepterInterval(KEY_GPIO_D, 65535);
	
	winMode= cJSON_GetObjectItem(param,"w")->valueint;
    gameMode = cJSON_GetObjectItem(param,"m")->valueint;
	
	printf("start chinese. winMode=%d, gameMode=%d.\n", winMode, gameMode);
	
	fatfs_readFile(cJSON_GetObjectItem(param,"f")->valuestring, &DataBuff);
	YingYuCount = DataBuff[12] | (DataBuff[13]<<8) | (DataBuff[14]<<16)| (DataBuff[15]<<24);

	start();
	return 0;
}
void YingYu::start(){
	startPrepare();
	show_status_info(answerInfo);
	showScore();
	createQuestion();
	showQuetion();
}

 看看效果：