110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES && LV_USE_LABEL
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static void position_bullet(lv_event_t * e, lv_point_t * p)
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{
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lv_indev_t * indev = lv_event_get_param(e);
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lv_indev_get_point(indev, p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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p->x -= lv_obj_get_x(parent);
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p->y -= lv_obj_get_y(parent);
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int32_t w = lv_obj_get_width(parent);
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int32_t h = lv_obj_get_height(parent);
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lv_obj_set_pos(bullet, LV_CLAMP(5, p->x, w - 20), LV_CLAMP(5, p->y, h - 20));
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}
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static void frac_1_event_cb(lv_event_t * e)
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{
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lv_style_t * style = lv_event_get_user_data(e);
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lv_style_value_t v;
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lv_style_get_prop(style, LV_STYLE_BG_GRAD, &v);
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lv_grad_dsc_t * dsc = (lv_grad_dsc_t *)v.ptr;
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lv_point_t p;
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position_bullet(e, &p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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dsc->stops[0].frac = LV_CLAMP(0, p.x * 255 / lv_obj_get_width(parent), 255);
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lv_obj_invalidate(parent);
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}
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static void frac_2_event_cb(lv_event_t * e)
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{
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lv_style_t * style = lv_event_get_user_data(e);
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lv_style_value_t v;
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lv_style_get_prop(style, LV_STYLE_BG_GRAD, &v);
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lv_grad_dsc_t * dsc = (lv_grad_dsc_t *)v.ptr;
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lv_point_t p;
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position_bullet(e, &p);
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lv_obj_t * bullet = lv_event_get_target(e);
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lv_obj_t * parent = lv_obj_get_parent(bullet);
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dsc->stops[1].frac = LV_CLAMP(0, p.x * 255 / lv_obj_get_width(parent), 255);
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lv_obj_invalidate(parent);
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}
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/**
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* Play with a simple horizontal gradient.
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* Adjust the stop positions of the gradient.
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*/
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void lv_example_grad_1(void)
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{
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static const lv_color_t grad_colors[2] = {
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LV_COLOR_MAKE(0xff, 0x00, 0x00),
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LV_COLOR_MAKE(0x00, 0xff, 0x00),
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};
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static const lv_opa_t grad_opa[2] = {
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LV_OPA_100,
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LV_OPA_0,
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};
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static const uint8_t frac[2] = {
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20 * 255 / 100, /*20%*/
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80 * 255 / 100, /*80%*/
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};
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static lv_style_t style;
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lv_style_init(&style);
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static lv_grad_dsc_t grad_dsc;
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lv_grad_init_stops(&grad_dsc, grad_colors, grad_opa, frac, sizeof(grad_colors) / sizeof(lv_color_t));
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lv_grad_horizontal_init(&grad_dsc);
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/*Set gradient as background*/
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lv_style_set_bg_grad(&style, &grad_dsc);
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lv_style_set_border_width(&style, 2);
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lv_style_set_pad_all(&style, 0);
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lv_style_set_radius(&style, 12);
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/*Create an object with the new style*/
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lv_obj_t * obj = lv_obj_create(lv_screen_active());
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lv_obj_add_style(obj, &style, 0);
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lv_obj_set_size(obj, lv_pct(80), lv_pct(80));
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lv_obj_center(obj);
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lv_obj_t * frac_1 = lv_button_create(obj);
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lv_obj_set_size(frac_1, 15, 15);
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lv_obj_set_style_bg_color(frac_1, lv_color_hex(0xff00ff), 0);
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lv_obj_add_event_cb(frac_1, frac_1_event_cb, LV_EVENT_PRESSING, &style);
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lv_obj_set_ext_click_area(frac_1, 5);
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lv_obj_set_pos(frac_1, lv_pct(20), lv_pct(50));
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lv_obj_t * frac_2 = lv_button_create(obj);
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lv_obj_set_size(frac_2, 15, 15);
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lv_obj_set_style_bg_color(frac_2, lv_color_hex(0xffff00), 0);
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lv_obj_add_event_cb(frac_2, frac_2_event_cb, LV_EVENT_PRESSING, &style);
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lv_obj_set_ext_click_area(frac_2, 5);
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lv_obj_set_pos(frac_2, lv_pct(80), lv_pct(50));
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}
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#endif
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