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57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
2 years ago
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#include "../../lv_examples.h"
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#if LV_USE_SLIDER && LV_BUILD_EXAMPLES
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static void slider_event_cb(lv_event_t * e);
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/**
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* Show the current value when the slider is pressed by extending the drawer
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*
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*/
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void lv_example_slider_3(void)
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{
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/*Create a slider in the center of the display*/
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lv_obj_t * slider;
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slider = lv_slider_create(lv_scr_act());
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lv_obj_center(slider);
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lv_slider_set_mode(slider, LV_SLIDER_MODE_RANGE);
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lv_slider_set_value(slider, 70, LV_ANIM_OFF);
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lv_slider_set_left_value(slider, 20, LV_ANIM_OFF);
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lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_ALL, NULL);
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lv_obj_refresh_ext_draw_size(slider);
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}
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static void slider_event_cb(lv_event_t * e)
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{
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lv_event_code_t code = lv_event_get_code(e);
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lv_obj_t * obj = lv_event_get_target(e);
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/*Provide some extra space for the value*/
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if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
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lv_event_set_ext_draw_size(e, 50);
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}
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else if(code == LV_EVENT_DRAW_PART_END) {
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lv_obj_draw_part_dsc_t * dsc = lv_event_get_draw_part_dsc(e);
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if(dsc->part == LV_PART_INDICATOR) {
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char buf[16];
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lv_snprintf(buf, sizeof(buf), "%d - %d", (int)lv_slider_get_left_value(obj), (int)lv_slider_get_value(obj));
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lv_point_t label_size;
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lv_txt_get_size(&label_size, buf, LV_FONT_DEFAULT, 0, 0, LV_COORD_MAX, 0);
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lv_area_t label_area;
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label_area.x1 = dsc->draw_area->x1 + lv_area_get_width(dsc->draw_area) / 2 - label_size.x / 2;
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label_area.x2 = label_area.x1 + label_size.x;
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label_area.y2 = dsc->draw_area->y1 - 10;
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label_area.y1 = label_area.y2 - label_size.y;
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lv_draw_label_dsc_t label_draw_dsc;
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lv_draw_label_dsc_init(&label_draw_dsc);
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label_draw_dsc.color = lv_color_hex3(0x888);
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lv_draw_label(dsc->draw_ctx, &label_draw_dsc, &label_area, buf, NULL);
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}
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}
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}
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#endif
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