1.lv_slider

void lv_ex_get_started_3(void)
{/* 创建一个滑块 */lv_obj_t * slider = lv_slider_create(lv_scr_act(), NULL);lv_obj_set_width(slider, 200);                        /*Set the width*/lv_obj_align(slider, NULL, LV_ALIGN_CENTER, 0, 0);    /*Align to the center of the parent (screen)*/lv_obj_set_event_cb(slider, slider_event_cb);         /*slider_event_cb 是回调函数*//* 创建一个文本 */label = lv_label_create(lv_scr_act(), NULL);lv_label_set_text(label, "0");lv_obj_set_auto_realign(slider, true);                          /*To keep center alignment when the width of the text changes*/lv_obj_align(label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 20);    /*Align below the slider*/
}/*回调函数*/
static void slider_event_cb(lv_obj_t * slider, lv_event_t event)
{if(event == LV_EVENT_VALUE_CHANGED) {/*Refresh the text*/lv_label_set_text_fmt(label, "%d", lv_slider_get_value(slider));}
}

另外 lv_slider_set_value(slider, 70, LV_ANIM_OFF); 可以设置滑块默认的值

2.lv_style


void lv_ex_style_10(void)
{static lv_style_t style;lv_style_init(&style);/*Set a background color and a radius*/lv_style_set_radius(&style, LV_STATE_DEFAULT, 5);  //圆角是5 ；对象状态是默认的LV_STATE_DEFAULTlv_style_set_bg_opa(&style, LV_STATE_DEFAULT, LV_OPA_COVER); //对象状态是默认的LV_STATE_DEFAULT；lv_style_set_bg_color(&style, LV_STATE_DEFAULT, LV_COLOR_SILVER);//颜色/*按下时 颜色改变*/lv_style_set_bg_color(&style, LV_STATE_PRESSED, LV_COLOR_GRAY);//对象状态是 LV_STATE_PRESSED；当这个状态时 ，颜色变成GRAY/*Set different transition time in default and pressed state*fast press, slower revert to default*//*译文：不同模式下切换状态的时间长短   */lv_style_set_transition_time(&style, LV_STATE_DEFAULT, 500);lv_style_set_transition_time(&style, LV_STATE_PRESSED, 200);/*Small delay to make transition more visible*/// lv_style_set_transition_delay(&style, LV_STATE_DEFAULT, 100);/*Add `bg_color` to transitioned properties*/lv_style_set_transition_prop_1(&style, LV_STATE_DEFAULT, LV_STYLE_BG_COLOR);/*Create an object with the new style*/lv_obj_t * obj = lv_obj_create(lv_scr_act(), NULL);lv_obj_add_style(obj, LV_BTN_PART_MAIN, &style);lv_obj_align(obj, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);
}

3.按钮

例子1


void lv_ex_get_started_1(void)
{
//创建一个按钮lv_obj_t * btn = lv_btn_create(lv_scr_act(), NULL);     /*Add a button the current screen*/lv_obj_set_pos(btn, 10, 10);                            /*Set its position*/lv_obj_set_size(btn, 120, 50);                          /*Set its size*/lv_obj_set_event_cb(btn, btn_event_cb);                 /*回调函数btn_event_cb*/
//创建一个文本lv_obj_t * label = lv_label_create(btn, NULL);          /*Add a label to the button*/lv_label_set_text(label, "Button");                     /*Set the labels text*/
}//这是按钮的  回调函数
static void btn_event_cb(lv_obj_t * btn, lv_event_t event)
{if(event == LV_EVENT_CLICKED) {static uint8_t cnt = 0;cnt++;/*Get the first child of the button which is the label and change its text*/lv_obj_t * label = lv_obj_get_child(btn, NULL);lv_label_set_text_fmt(label, "Button: %d", cnt);}
}

例子2

4.label

  lv_obj_t *label = lv_label_create(lv_scr_act(),NULL);lv_label_set_text_fmt(label, "%d", 28);  // 显示数字
lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);//中间对齐

5.例子


void lv_ex_get_started_2(void)
{static lv_style_t style_btn;static lv_style_t style_btn_red;/*Create a simple button style*/lv_style_init(&style_btn);lv_style_set_radius(&style_btn, LV_STATE_DEFAULT, 10);lv_style_set_bg_opa(&style_btn, LV_STATE_DEFAULT, LV_OPA_COVER);lv_style_set_bg_color(&style_btn, LV_STATE_DEFAULT, LV_COLOR_SILVER);lv_style_set_bg_grad_color(&style_btn, LV_STATE_DEFAULT, LV_COLOR_GRAY);lv_style_set_bg_grad_dir(&style_btn, LV_STATE_DEFAULT, LV_GRAD_DIR_VER);/*Swap the colors in pressed state*/lv_style_set_bg_color(&style_btn, LV_STATE_PRESSED, LV_COLOR_GRAY);lv_style_set_bg_grad_color(&style_btn, LV_STATE_PRESSED, LV_COLOR_SILVER);/*Add a border*/lv_style_set_border_color(&style_btn, LV_STATE_DEFAULT, LV_COLOR_WHITE);lv_style_set_border_opa(&style_btn, LV_STATE_DEFAULT, LV_OPA_70);lv_style_set_border_width(&style_btn, LV_STATE_DEFAULT, 2);/*Different border color in focused state*/lv_style_set_border_color(&style_btn, LV_STATE_FOCUSED, LV_COLOR_BLUE);lv_style_set_border_color(&style_btn, LV_STATE_FOCUSED | LV_STATE_PRESSED, LV_COLOR_NAVY);/*Set the text style*/lv_style_set_text_color(&style_btn, LV_STATE_DEFAULT, LV_COLOR_WHITE);/*Make the button smaller when pressed*/lv_style_set_transform_height(&style_btn, LV_STATE_PRESSED, -5);lv_style_set_transform_width(&style_btn, LV_STATE_PRESSED, -10);
#if LV_USE_ANIMATION/*Add a transition to the size change*/static lv_anim_path_t path;lv_anim_path_init(&path);lv_anim_path_set_cb(&path, lv_anim_path_overshoot);lv_style_set_transition_prop_1(&style_btn, LV_STATE_DEFAULT, LV_STYLE_TRANSFORM_HEIGHT);lv_style_set_transition_prop_2(&style_btn, LV_STATE_DEFAULT, LV_STYLE_TRANSFORM_WIDTH);lv_style_set_transition_time(&style_btn, LV_STATE_DEFAULT, 300);lv_style_set_transition_path(&style_btn, LV_STATE_DEFAULT, &path);
#endif/*Create a red style. Change only some colors.*/lv_style_init(&style_btn_red);lv_style_set_bg_color(&style_btn_red, LV_STATE_DEFAULT, LV_COLOR_RED);lv_style_set_bg_grad_color(&style_btn_red, LV_STATE_DEFAULT, LV_COLOR_MAROON);lv_style_set_bg_color(&style_btn_red, LV_STATE_PRESSED, LV_COLOR_MAROON);lv_style_set_bg_grad_color(&style_btn_red, LV_STATE_PRESSED, LV_COLOR_RED);lv_style_set_text_color(&style_btn_red, LV_STATE_DEFAULT, LV_COLOR_WHITE);
#if LV_USE_BTN/*Create buttons and use the new styles*/lv_obj_t * btn = lv_btn_create(lv_scr_act(), NULL);     /*Add a button the current screen*/lv_obj_set_pos(btn, 10, 10);                            /*Set its position*/lv_obj_set_size(btn, 120, 50);                          /*Set its size*/lv_obj_reset_style_list(btn, LV_BTN_PART_MAIN);         /*Remove the styles coming from the theme*/lv_obj_add_style(btn, LV_BTN_PART_MAIN, &style_btn);lv_obj_t * label = lv_label_create(btn, NULL);          /*Add a label to the button*/lv_label_set_text(label, "Button");                     /*Set the labels text*//*Create a new button*/lv_obj_t * btn2 = lv_btn_create(lv_scr_act(), btn);lv_obj_set_pos(btn2, 10, 80);lv_obj_set_size(btn2, 120, 50);                             /*Set its size*/lv_obj_reset_style_list(btn2, LV_BTN_PART_MAIN);         /*Remove the styles coming from the theme*/lv_obj_add_style(btn2, LV_BTN_PART_MAIN, &style_btn);lv_obj_add_style(btn2, LV_BTN_PART_MAIN, &style_btn_red);   /*Add the red style on top of the current */lv_obj_set_style_local_radius(btn2, LV_BTN_PART_MAIN, LV_STATE_DEFAULT, LV_RADIUS_CIRCLE); /*Add a local style*/label = lv_label_create(btn2, NULL);          /*Add a label to the button*/lv_label_set_text(label, "Button 2");                     /*Set the labels text*/
#endif
}

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littleVGL总结

文章目录

1.lv_slider

2.lv_style

3.按钮

例子1

例子2

4.label

5.例子

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