圖片播放器(九)：觸控式螢幕處理
input事件解析：
##################### type = 3 code = 0 value = 724 //讀取的X座標的值
type = 3 code = 1 value = 328 //讀取的Y座標的值
type = 1 code = 330 value = 1 //330 是觸控式螢幕的按鍵值
##################### type = 3 code = 24 value = 1 //24 表示壓力值，驅動值定義的壓力值範圍是 0 到 1
type = 0 code = 0 value = 0 //同步訊號
type = 1 code = 330 value = 0
##################### type = 3 code = 24 value = 0 //表示彈起
type = 0 code = 0 value = 0 // 下面連續傳送9次同步資訊，作為結束髮送
type = 0 code = 2 value = 0
##################### type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
##################### type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
##################### type = 0 code = 0 value = 0
在inut.h中
/* * Event types */ #define EV_SYN 0x00 //表示支援所有事件 #define EV_KEY 0x01 //鍵盤或者按鍵，表示一個鍵碼 #define EV_REL 0x02 //滑鼠裝置，表示一個相對的游標位置結果 #define EV_ABS 0x03 //手寫板產生的值，其是一個絕對整數值 #define EV_MSC 0x04 //其他型別 #define EV_SW 0x05 //轉換 #define EV_LED 0x11 //led #define EV_SND 0x12 //聲音裝置 #define EV_REP 0x14 //允許重複輸入按鍵型別 #define EV_FF 0x15 #define EV_PWR 0x16 //電源管理 #define EV_FF_STATUS 0x17 #define EV_MAX 0x1f #define EV_CNT (EV_MAX+1)
操作定義：
/* 觸控式螢幕的操作模式 */
enum to_operating_mode
{
up_switchover = 1, /* 向上翻頁 */
down_switchover, /* 向下翻頁 */
left_switchover, /* 向左翻頁 */
right_switchover, /* 向右翻頁 */
add_file, /* 新增檔案 */
delete_file, /* 刪除檔案 */
};資訊結構體：
struct read_info { unsigned int x_coordinate; /* x座標*/ unsigned int y_coordinate; /* y座標*/ long event_timr; /* 觸發時間 */ };
全域性變數和巨集定義：
/* 觸控式螢幕檔案 */
#define DEVICE_KEY "/dev/input/event1"
struct input_event env1; /* input 事件 */
struct read_info read_arry[READ_MAX_NUM] = {{0}}; /*把從觸控式螢幕讀到的有效資料儲存到這裡 */
int now_num = 0; /* 現在讀取了多少個數據 */核心處理函式：用來做總的管理
/* 核心處理函式 */
int tu_core(void)
{
int ret = -1;
tu_read_touch();
ret = tu_is_judge();
return ret;
}
讀取觸控式螢幕資訊並轉化為相應的可用資訊：
/* 讀取觸控式螢幕資訊 */
int tu_read_touch(void)
{
int fd1 = -1;
int ret = -1;
int i = 0;
int arry_num = 0;
int end_num = 4; /* 讀取結束標誌，因為結束時會發送4次type = 0，code = 2*/
/* 結束資訊
type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
type = 0 code = 2 value = 0
type = 0 code = 0 value = 0
*/
fd1 = open(DEVICE_KEY, O_RDONLY);
if(fd1 < 0){
DERROR("open1\n");
return -1;
}
for(;i < READ_MAX_NUM; i++)
{
ret = read(fd1, &env1, sizeof(struct input_event));
if(ret <= 0){
return -1;
}
if(end_num == 0)
break;
if((env1.type == 3) && (env1.code == 0)){
read_arry[arry_num].x_coordinate = env1.value;
}else if((env1.type == 3) && (env1.code == 1)){
read_arry[arry_num].y_coordinate = env1.value;
read_arry[arry_num].event_timr = env1.value;
++arry_num;
}else if((env1.type == 0) && (env1.code == 2)){
--end_num;
}
memset(&env1, 0, sizeof(struct input_event));
}
/* 作為結束標誌 */
read_arry[arry_num].x_coordinate = read_arry[arry_num].y_coordinate = read_arry[arry_num].event_timr = 0;
now_num = arry_num;
DEBUG("ok-------------\n");
close(fd1);
return 0;
}
判斷是哪種操作：
/* 判斷是哪種操作 */
int tu_is_judge(void)
{
int x_add = 0;
int y_add = 0;
int i = 0;
for(; i<now_num - 1; i++)
{
x_add += read_arry[i].x_coordinate - read_arry[i + 1].x_coordinate;
y_add += read_arry[i].y_coordinate - read_arry[i + 1].y_coordinate;
//DEBUG("x = %d , y = %d \n", read_arry[i].x_coordinate, read_arry[i].y_coordinate);
}
DEBUG("x_add = %d , y_add = %d \n", x_add, y_add);
if((x_add > 0) && (abs(x_add) > abs(y_add))){ /* 向左翻頁 */
return left_switchover;
}else if((x_add < 0) && (abs(x_add) > abs(y_add))){ /* 向右翻頁 */
return right_switchover;
}else if((y_add < 0) && (abs(x_add) < abs(y_add))){ /* 向下翻頁 */
return down_switchover;
}else if((y_add > 0) && (abs(x_add) < abs(y_add))){ /* 向上翻頁 */
return up_switchover;
}
return 0;
}