LCUI/tests/test_touch.c at develop · lc-soft/LCUI · GitHub

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/*
 * tests/test_touch.c
 *
 * Copyright (c) 2023, Liu Chao <i@lc-soft.io> All rights reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * This file is part of LCUI, distributed under the MIT License found in the
 * LICENSE.TXT file in the root directory of this source tree.
 */

/** test_touch.c -- test touch support */

#include <stdio.h>
#include <stdlib.h>
#include <LCUI.h>
#include <pandagl.h>

/** 触点绑定记录 */
typedef struct TouchPointBindingRec_ {
	int point_id;        /**< 触点 ID */
	ui_widget_t *widget; /**< 部件 */
	list_node_t node;    /**< 在链表中的结点 */
	bool is_valid;  /**< 是否有效 */
} TouchPointBindingRec, *TouchPointBinding;

/** 触点绑定记录列表 */
static list_t touch_bindings;

static void OnTouchWidget(ui_widget_t *w, ui_event_t *e, void *arg)
{
	ui_touch_point_t *point;
	TouchPointBinding binding;

	if (e->touch.n_points == 0) {
		return;
	}
	binding = e->data;
	point = &e->touch.points[0];
	switch (point->state) {
	case UI_EVENT_TOUCHMOVE:
		ui_widget_move(w, point->x - 32.0f, point->y - 32.0f);
		break;
	case UI_EVENT_TOUCHUP:
		if (!binding->is_valid) {
			break;
		}
		/* 当触点释放后销毁部件及绑定记录 */
		ui_widget_release_touch_capture(w, -1);
		list_unlink(&touch_bindings, &binding->node);
		binding->is_valid = false;
		ui_widget_remove(w);
		free(binding);
		break;
	case UI_EVENT_TOUCHDOWN:
	default:
		break;
	}
}

static void OnTouch(ptk_event_t *e, void *arg)
{
	int i;
	ui_widget_t *w;
	list_node_t *node;
	touch_point_t *point;
	pd_color_t bgcolor = pd_rgb(255, 0, 0);

	for (i = 0; i < e->touch.n_points; ++i) {
		TouchPointBinding binding;
		bool is_existed = false;
		point = &e->touch.points[i];
		_DEBUG_MSG("point: %d\n", point->id);
		/* 检查该触点是否已经被绑定 */
		for (list_each(node, &touch_bindings)) {
			binding = node->data;
			if (binding->point_id == point->id) {
				is_existed = true;
			}
		}
		if (is_existed) {
			continue;
		}
		w = ui_create_widget(NULL);
		/* 新建绑定记录 */
		binding = malloc(sizeof(TouchPointBindingRec));
		binding->point_id = point->id;
		binding->node.data = binding;
		binding->is_valid = true;
		binding->widget = w;
		ui_widget_resize(w, 64, 64);
		ui_widget_move(w, point->x - 32.0f, point->y - 32.0f);
		/* 设置让该部件捕获当前触点 */
		ui_widget_set_touch_capture(w, binding->point_id);
		ui_widget_on(w, "touch", OnTouchWidget, binding, NULL);
		ui_widget_set_style_string(w, "position", "absolute");
		ui_widget_set_style_color_value(w, css_prop_background_color,
						bgcolor.value);
		list_append_node(&touch_bindings, &binding->node);
		ui_root_append(w);
	}
}

int main(int argc, char **argv)
{
	lcui_init();
	list_create(&touch_bindings);
	ptk_on_event(PTK_EVENT_TOUCH, OnTouch, NULL);
	return lcui_main();
}