LVGL-输入设备LV_INDEV_TYPE

void _lv_indev_read_task(lv_task_t * task)是定时执行的输入设备任务回调函数。会处理输入设备的数据。

按下的处理：

static void indev_proc_press(lv_indev_proc_t * proc)

{

……

*首先从layer_sys，layer_top，scr_act按优级查找当前的活动对象

/* bool lv_obj_is_point_on_coords(lv_obj_t * obj, const lv_point_t * point)*/

indev_obj_act = lv_indev_search_obj(lv_disp_get_layer_sys(disp), &proc->types.pointer.act_point);

if(indev_obj_act == NULL) indev_obj_act =         lv_indev_search_obj(lv_disp_get_layer_top(disp),
                                                                          &proc->types.pointer.act_point);
        if(indev_obj_act == NULL) indev_obj_act = lv_indev_search_obj(lv_disp_get_scr_act(disp),
                                                                          &proc->types.pointer.act_point);
        new_obj_searched = true;

……

*如果按下时有throw动作手动停止。page drag后一般有throw动作。

/*The last object might have drag throw. Stop it manually*/
            if(new_obj_searched && proc->types.pointer.last_obj) {
                proc->types.pointer.drag_throw_vect.x = 0;
                proc->types.pointer.drag_throw_vect.y = 0;
                indev_drag_throw(proc);
            }

……

*如果当前的活动对与上一次的活动对象不一样。proc->types.pointer.act_obj是上一次的活动对象，通知上一个活动对象PRESS_LOST（1次）。通知最近的对象被PRESSED(1次)，并复位一些寄存器。

    /*If a new object was found reset some variables and send a pressed signal*/if(indev_obj_act != proc->types.pointer.act_obj) {/*刚选中的活动对象不产生坐标向量值，把last_point与act_point同步*/proc->types.pointer.last_point.x = proc->types.pointer.act_point.x;proc->types.pointer.last_point.y = proc->types.pointer.act_point.y;/*If a new object found the previous was lost, so send a signal*/if(proc->types.pointer.act_obj != NULL) {/*Save the obj because in special cases `act_obj` can change in the signal function*/lv_obj_t * last_obj = proc->types.pointer.act_obj;last_obj->signal_cb(last_obj, LV_SIGNAL_PRESS_LOST, indev_act);if(indev_reset_check(proc)) return;lv_event_send(last_obj, LV_EVENT_PRESS_LOST, NULL);if(indev_reset_check(proc)) return;}proc->types.pointer.act_obj  = indev_obj_act; /*Save the pressed object*/proc->types.pointer.last_obj = indev_obj_act;if(indev_obj_act != NULL) {/* Save the time when the obj pressed to count long press time.*/proc->pr_timestamp                 = lv_tick_get();proc->long_pr_sent                 = 0;proc->types.pointer.drag_limit_out = 0;proc->types.pointer.drag_in_prog   = 0;proc->types.pointer.drag_sum.x     = 0;proc->types.pointer.drag_sum.y     = 0;proc->types.pointer.drag_dir = LV_DRAG_DIR_BOTH;proc->types.pointer.gesture_sent   = 0;proc->types.pointer.gesture_sum.x  = 0;proc->types.pointer.gesture_sum.y  = 0;proc->types.pointer.vect.x         = 0;proc->types.pointer.vect.y         = 0;/*Search for 'top' attribute*/lv_obj_t * i        = indev_obj_act;lv_obj_t * last_top = NULL;while(i != NULL) {if(i->top) last_top = i;i = lv_obj_get_parent(i);}if(last_top != NULL) {/*Move the last_top object to the foreground*/lv_obj_move_foreground(last_top);}/*Send a signal about the press*/indev_obj_act->signal_cb(indev_obj_act, LV_SIGNAL_PRESSED, indev_act);if(indev_reset_check(proc)) return;lv_event_send(indev_obj_act, LV_EVENT_PRESSED, NULL);if(indev_reset_check(proc)) return;if(indev_act->proc.wait_until_release) return;/*Handle focus*/indev_click_focus(&indev_act->proc);if(indev_reset_check(proc)) return;}}

*构建drag_throw_vect（throw效果的向量）与vect（两次坐标输入向量）的相关性，方便释放时使用。

    ……/*Calculate the types.pointer.vector*/proc->types.pointer.vect.x = proc->types.pointer.act_point.x - proc->types.pointer.last_point.x;proc->types.pointer.vect.y = proc->types.pointer.act_point.y - proc->types.pointer.last_point.y;proc->types.pointer.drag_throw_vect.x = (proc->types.pointer.drag_throw_vect.x * 5) >> 3;proc->types.pointer.drag_throw_vect.y = (proc->types.pointer.drag_throw_vect.y * 5) >> 3;if(proc->types.pointer.drag_throw_vect.x < 0)proc->types.pointer.drag_throw_vect.x++;else if(proc->types.pointer.drag_throw_vect.x > 0)proc->types.pointer.drag_throw_vect.x--;if(proc->types.pointer.drag_throw_vect.y < 0)proc->types.pointer.drag_throw_vect.y++;else if(proc->types.pointer.drag_throw_vect.y > 0)proc->types.pointer.drag_throw_vect.y--;proc->types.pointer.drag_throw_vect.x += (proc->types.pointer.vect.x * 4) >> 3;proc->types.pointer.drag_throw_vect.y += (proc->types.pointer.vect.y * 4) >> 3;……

*处理拖动、手势、长按、重复长按。PRESSING信号会一直发送。

    /*If there is active object and it can be dragged run the drag*/if(indev_obj_act != NULL) {indev_obj_act->signal_cb(indev_obj_act, LV_SIGNAL_PRESSING, indev_act);if(indev_reset_check(proc)) return;lv_event_send(indev_obj_act, LV_EVENT_PRESSING, NULL);if(indev_reset_check(proc)) return;if(indev_act->proc.wait_until_release) return;indev_drag(proc);indev_gesture(proc);if(indev_reset_check(proc)) return;/*If there is no drag then check for long press time*/if(proc->types.pointer.drag_in_prog == 0 && proc->long_pr_sent == 0) {/*Send a signal about the long press if enough time elapsed*/if(lv_tick_elaps(proc->pr_timestamp) >                 indev_act->driver.long_press_time)                                  {indev_obj_act->signal_cb(indev_obj_act, LV_SIGNAL_LONG_PRESS, indev_act);if(indev_reset_check(proc)) return;lv_event_send(indev_obj_act, LV_EVENT_LONG_PRESSED, NULL);if(indev_reset_check(proc)) return;/*Mark the signal sending to do not send it again*/proc->long_pr_sent = 1;/*Save the long press time stamp for the long press repeat handler*/proc->longpr_rep_timestamp = lv_tick_get();}}/*Send long press repeated signal*/if(proc->types.pointer.drag_in_prog == 0 && proc->long_pr_sent == 1) {/*Send a signal about the long press repeat if enough time elapsed*/if(lv_tick_elaps(proc->longpr_rep_timestamp) > indev_act->driver.long_press_rep_time) {indev_obj_act->signal_cb(indev_obj_act, LV_SIGNAL_LONG_PRESS_REP, indev_act);if(indev_reset_check(proc)) return;lv_event_send(indev_obj_act, LV_EVENT_LONG_PRESSED_REPEAT, NULL);if(indev_reset_check(proc)) return;proc->longpr_rep_timestamp = lv_tick_get();}}}

*indev_drag有两个变量，proc->types.pointer.drag_limit_out全局变量开启拖累后会一直为1，切到新对象才到写0。drag_just_started局部变量与limit_out同时置位控制方向，DRAG_BEGIN信号发送。

static void indev_drag(lv_indev_proc_t * proc)
{lv_obj_t * drag_obj    = get_dragged_obj(proc->types.pointer.act_obj);bool drag_just_started = false;uint8_t drag_dir; //saimenif(drag_obj == NULL) return;if(lv_obj_get_drag(drag_obj) == false) return;lv_drag_dir_t allowed_dirs = lv_obj_get_drag_dir(drag_obj);/*Count the movement by drag*/if(proc->types.pointer.drag_limit_out == 0) {proc->types.pointer.drag_sum.x += proc->types.pointer.vect.x;proc->types.pointer.drag_sum.y += proc->types.pointer.vect.y;/*Enough move?*/bool hor_en = false;bool ver_en = false;if(allowed_dirs == LV_DRAG_DIR_HOR || allowed_dirs == LV_DRAG_DIR_BOTH) {hor_en = true;}if(allowed_dirs == LV_DRAG_DIR_VER || allowed_dirs == LV_DRAG_DIR_BOTH ||\allowed_dirs == LV_DRAG_DIR_VER_ONLY_UP || allowed_dirs == LV_DRAG_DIR_VER_ONLY_DOWN) {ver_en = true;}if(allowed_dirs == LV_DRAG_DIR_ONE) {if(LV_MATH_ABS(proc->types.pointer.drag_sum.x) > LV_MATH_ABS(proc->types.pointer.drag_sum.y)) {hor_en = true;drag_dir = 0x10;}else {ver_en = true;drag_dir = 0x20;}}/*If a move is greater then LV_DRAG_LIMIT then begin the drag*/if((hor_en && LV_MATH_ABS(proc->types.pointer.drag_sum.x) >= indev_act->driver.drag_limit) ||(ver_en && LV_MATH_ABS(proc->types.pointer.drag_sum.y) >= indev_act->driver.drag_limit)) {proc->types.pointer.drag_limit_out = 1;drag_just_started                   = true;if(drag_dir==0x10){if(proc->types.pointer.drag_sum.x>0){drag_dir |= 1;}else{drag_dir |= 2;}}else{if(proc->types.pointer.drag_sum.y>0){drag_dir |= 1;}else{drag_dir |= 2;}}}}/*If the drag limit is exceeded handle the dragging*/if(proc->types.pointer.drag_limit_out != 0) {/*Set new position if the vector is not zero*/if(proc->types.pointer.vect.x != 0 || proc->types.pointer.vect.y != 0) {lv_coord_t prev_x     = drag_obj->coords.x1;lv_coord_t prev_y     = drag_obj->coords.y1;lv_coord_t prev_par_w = lv_obj_get_width(lv_obj_get_parent(drag_obj));lv_coord_t prev_par_h = lv_obj_get_height(lv_obj_get_parent(drag_obj));/*Get the coordinates of the object and modify them*/lv_coord_t act_x = lv_obj_get_x(drag_obj);lv_coord_t act_y = lv_obj_get_y(drag_obj);if(allowed_dirs == LV_DRAG_DIR_BOTH) {if(drag_just_started) {proc->types.pointer.drag_dir = LV_DRAG_DIR_BOTH;act_x += proc->types.pointer.drag_sum.x;act_y += proc->types.pointer.drag_sum.y;}}else if(allowed_dirs == LV_DRAG_DIR_HOR) {if(drag_just_started) {proc->types.pointer.drag_dir = LV_DRAG_DIR_HOR;proc->types.pointer.drag_sum.y = 0;act_x += proc->types.pointer.drag_sum.x;}}else if(allowed_dirs == LV_DRAG_DIR_VER) {if(drag_just_started) {proc->types.pointer.drag_dir = LV_DRAG_DIR_VER;proc->types.pointer.drag_sum.x = 0;act_y += proc->types.pointer.drag_sum.y;}}else if(allowed_dirs == LV_DRAG_DIR_ONE) {if(drag_just_started) {if(LV_MATH_ABS(proc->types.pointer.drag_sum.x) > LV_MATH_ABS(proc->types.pointer.drag_sum.y)) {proc->types.pointer.drag_dir = LV_DRAG_DIR_HOR;proc->types.pointer.drag_sum.y = 0;act_x += proc->types.pointer.drag_sum.x;}else {proc->types.pointer.drag_dir = LV_DRAG_DIR_VER;proc->types.pointer.drag_sum.x = 0;act_y += proc->types.pointer.drag_sum.y;}}}else if (allowed_dirs == LV_DRAG_DIR_VER_ONLY_UP) {if (drag_just_started) {proc->types.pointer.drag_dir = LV_DRAG_DIR_VER;proc->types.pointer.drag_sum.x = 0;if (act_y + proc->types.pointer.drag_sum.y <= 0)act_y += proc->types.pointer.drag_sum.y;elseproc->types.pointer.drag_sum.y = 0;}}else if (allowed_dirs == LV_DRAG_DIR_VER_ONLY_DOWN) {if (drag_just_started) {proc->types.pointer.drag_dir = LV_DRAG_DIR_VER;proc->types.pointer.drag_sum.x = 0;if (act_y + proc->types.pointer.drag_sum.y >= 0)act_y += proc->types.pointer.drag_sum.y;elseproc->types.pointer.drag_sum.y = 0;}}/*Move the object*/if(allowed_dirs == LV_DRAG_DIR_HOR ||allowed_dirs == LV_DRAG_DIR_BOTH ||(allowed_dirs == LV_DRAG_DIR_ONE &&LV_MATH_ABS(proc->types.pointer.drag_sum.x) > LV_MATH_ABS(proc->types.pointer.drag_sum.y))) {act_x += proc->types.pointer.vect.x;}if(allowed_dirs == LV_DRAG_DIR_VER ||allowed_dirs == LV_DRAG_DIR_BOTH ||(allowed_dirs == LV_DRAG_DIR_ONE &&LV_MATH_ABS(proc->types.pointer.drag_sum.x) < LV_MATH_ABS(proc->types.pointer.drag_sum.y))) {act_y += proc->types.pointer.vect.y;}if (allowed_dirs == LV_DRAG_DIR_VER_ONLY_UP){if (act_y + proc->types.pointer.vect.y <= 0)act_y += proc->types.pointer.vect.y;}if (allowed_dirs == LV_DRAG_DIR_VER_ONLY_DOWN){if (act_y + proc->types.pointer.vect.y >= 0)act_y += proc->types.pointer.vect.y;}uint16_t inv_buf_size =lv_disp_get_inv_buf_size(indev_act->driver.disp); /*Get the number of currently invalidated areas*/lv_obj_set_pos(drag_obj, act_x, act_y);proc->types.pointer.drag_in_prog = 1;/*If the object didn't moved then clear the invalidated areas*/if(drag_obj->coords.x1 == prev_x && drag_obj->coords.y1 == prev_y) {/*In a special case if the object is moved on a page and* the scrollable has fit == true and the object is dragged of the page then* while its coordinate is not changing only the parent's size is reduced */lv_coord_t act_par_w = lv_obj_get_width(lv_obj_get_parent(drag_obj));lv_coord_t act_par_h = lv_obj_get_height(lv_obj_get_parent(drag_obj));if(act_par_w == prev_par_w && act_par_h == prev_par_h) {uint16_t new_inv_buf_size = lv_disp_get_inv_buf_size(indev_act->driver.disp);_lv_disp_pop_from_inv_buf(indev_act->driver.disp, new_inv_buf_size - inv_buf_size);}}/*Set the drag in progress flag*//*Send the drag begin signal on first move*/if(drag_just_started) {drag_obj->signal_cb(drag_obj, LV_SIGNAL_DRAG_BEGIN, indev_act);if(indev_reset_check(proc)) return;//lv_event_send(drag_obj, LV_EVENT_DRAG_BEGIN, NULL);lv_event_send(drag_obj, LV_EVENT_DRAG_BEGIN, &drag_dir);if(indev_reset_check(proc)) return;}}}
}

*indev_drag中的通过调用void lv_obj_set_pos()来改变坐标，触发滚动传输。第次坐标的改变都会通知到父、子对象还有自已。

释放的处理：

static void indev_proc_release(lv_indev_proc_t * proc)

等一下写

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LVGL-输入设备LV_INDEV_TYPE_POINTER类型

按下的处理：

释放的处理：

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