slider结构体应该这样调整，少了一个alpha参数

[cxllm001]

typedef struct sgl_slider {
sgl_obj_t obj;
sgl_color_t track_color;
sgl_color_t knob_color;
sgl_color_t fill_color;
/* 0: horizontal, 1: vertical */
uint8_t direct : 1;
uint8_t value : 7;
uint8_t thickness;
uint8_t alpha;
}sgl_slider_t;