74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_TINY_TTF && LV_BUILD_EXAMPLES && LV_USE_MSG
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#define DISPLAY_TEXT "Hello World!"
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#define MSG_NEW_SIZE 1
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static void slider_event_cb(lv_event_t * e);
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static void label_event_cb(lv_event_t * e);
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/**
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* Change font size with Tiny_TTF
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*/
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void lv_example_tiny_ttf_3(void)
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{
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extern const uint8_t ubuntu_font[];
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extern const int ubuntu_font_size;
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int lsize = 25;
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/*Create style with the new font*/
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static lv_style_t style;
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lv_style_init(&style);
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lv_font_t * font = lv_tiny_ttf_create_data(ubuntu_font, ubuntu_font_size, lsize);
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lv_style_set_text_font(&style, font);
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lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);
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lv_obj_t * slider = lv_slider_create(lv_scr_act());
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lv_obj_center(slider);
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lv_slider_set_range(slider, 5, 50);
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lv_slider_set_value(slider, lsize, LV_ANIM_OFF);
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lv_obj_align(slider, LV_ALIGN_BOTTOM_MID, 0, -50);
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lv_obj_t * slider_label = lv_label_create(lv_scr_act());
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lv_label_set_text_fmt(slider_label, "%d", lsize);
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lv_obj_align_to(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
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lv_obj_add_event(slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, slider_label);
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/*Create a label with the new style*/
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lv_obj_t * label = lv_label_create(lv_scr_act());
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lv_obj_add_style(label, &style, 0);
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lv_obj_add_event(label, label_event_cb, LV_EVENT_MSG_RECEIVED, font);
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lv_obj_set_size(label, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
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lv_obj_center(label);
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lv_msg_subscribe_obj(MSG_NEW_SIZE, label, NULL);
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lv_msg_send(MSG_NEW_SIZE, &lsize);
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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_obj_t * slider = lv_event_get_target(e);
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lv_obj_t * label = lv_event_get_user_data(e);
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int lsize;
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lsize = (int)lv_slider_get_value(slider);
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lv_label_set_text_fmt(label, "%d", lsize);
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lv_msg_send(MSG_NEW_SIZE, &lsize);
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}
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static void label_event_cb(lv_event_t * e)
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{
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lv_obj_t * label = lv_event_get_target(e);
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lv_font_t * font = lv_event_get_user_data(e);
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lv_msg_t * m = lv_event_get_msg(e);
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const int32_t * v = lv_msg_get_payload(m);
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lv_tiny_ttf_set_size(font, *v);
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lv_label_set_text(label, DISPLAY_TEXT);
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}
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#endif
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