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73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_SCALE && LV_BUILD_EXAMPLES
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#include "../../../lvgl_private.h" /*To expose the fields of lv_draw_task_t*/
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static void draw_event_cb(lv_event_t * e)
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{
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lv_obj_t * obj = lv_event_get_target(e);
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lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
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lv_draw_dsc_base_t * base_dsc = lv_draw_task_get_draw_dsc(draw_task);
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lv_draw_label_dsc_t * label_draw_dsc = lv_draw_task_get_label_dsc(draw_task);
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if(base_dsc->part == LV_PART_INDICATOR) {
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if(label_draw_dsc) {
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const lv_color_t color_idx[7] = {
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lv_palette_main(LV_PALETTE_RED),
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lv_palette_main(LV_PALETTE_ORANGE),
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lv_palette_main(LV_PALETTE_YELLOW),
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lv_palette_main(LV_PALETTE_GREEN),
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lv_palette_main(LV_PALETTE_CYAN),
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lv_palette_main(LV_PALETTE_BLUE),
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lv_palette_main(LV_PALETTE_PURPLE),
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};
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uint8_t major_tick = lv_scale_get_major_tick_every(obj);
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label_draw_dsc->color = color_idx[base_dsc->id1 / major_tick];
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/*Free the previously allocated text if needed*/
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if(label_draw_dsc->text_local) lv_free((void *)label_draw_dsc->text);
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/*Malloc the text and set text_local as 1 to make LVGL automatically free the text.
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* (Local texts are malloc'd internally by LVGL. Mimic this behavior here too)*/
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char tmp_buffer[20] = {0}; /* Big enough buffer */
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lv_snprintf(tmp_buffer, sizeof(tmp_buffer), "%.1f", base_dsc->id2 * 1.0f);
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label_draw_dsc->text = lv_strdup(tmp_buffer);
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label_draw_dsc->text_local = 1;
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lv_point_t size;
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lv_text_get_size(&size, label_draw_dsc->text, label_draw_dsc->font, 0, 0, 1000, LV_TEXT_FLAG_NONE);
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int32_t new_w = size.x;
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int32_t old_w = lv_area_get_width(&draw_task->area);
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/* Distribute the new size equally on both sides */
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draw_task->area.x1 -= (new_w - old_w) / 2;
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draw_task->area.x2 += ((new_w - old_w) + 1) / 2; /* +1 for rounding */
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}
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}
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}
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/**
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* Customizing scale major tick label color with `LV_EVENT_DRAW_TASK_ADDED` event
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*/
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void lv_example_scale_7(void)
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{
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lv_obj_t * scale = lv_scale_create(lv_screen_active());
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lv_obj_set_size(scale, lv_pct(80), 100);
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lv_scale_set_mode(scale, LV_SCALE_MODE_HORIZONTAL_BOTTOM);
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lv_obj_center(scale);
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lv_scale_set_label_show(scale, true);
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lv_scale_set_total_tick_count(scale, 31);
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lv_scale_set_major_tick_every(scale, 5);
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lv_obj_set_style_length(scale, 5, LV_PART_ITEMS);
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lv_obj_set_style_length(scale, 10, LV_PART_INDICATOR);
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lv_scale_set_range(scale, 10, 40);
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lv_obj_add_event_cb(scale, draw_event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
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lv_obj_add_flag(scale, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
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}
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#endif
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