rt-thread/examples/gui/demo_view_benchmark.c

#include <rtgui/dc.h>
#include <rtgui/dc_hw.h>
#include <rtgui/rtgui_system.h>
#include <rtgui/widgets/container.h>
#include "demo_view.h"

#define RAND(x1, x2) ((rand() % (x2 - x1)) + x1)

static struct rtgui_container *container = RT_NULL;
static int running = 0;

void _onidle(struct rtgui_object *object, rtgui_event_t *event)
{
    rtgui_color_t color;
    rtgui_rect_t rect, draw_rect;
    struct rtgui_dc *dc;

    /* 获得控件所属的DC */
    // dc = rtgui_dc_hw_create(RTGUI_WIDGET(container));
    dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(container));
    if (dc == RT_NULL)
        return;

    demo_view_get_logic_rect(RTGUI_CONTAINER(container), &rect);
    draw_rect.x1 = RAND(rect.x1, rect.x2);
    draw_rect.y1 = RAND(rect.y1, rect.y2);
    draw_rect.x2 = RAND(draw_rect.x1, rect.x2);
    draw_rect.y2 = RAND(draw_rect.y1, rect.y2);

    color = RTGUI_RGB(rand() % 255, rand() % 255, rand() % 255);
    RTGUI_WIDGET_BACKGROUND(container) = color;

    rtgui_dc_fill_rect(dc, &draw_rect);

    /* 绘图完成 */
    rtgui_dc_end_drawing(dc);
}

void _draw_default(struct rtgui_object *object, rtgui_event_t *event)
{
    struct rtgui_widget *widget = RTGUI_WIDGET(object);
    struct rtgui_dc *dc;
    rtgui_rect_t rect;

    /* 因为用的是demo container，上面本身有一部分控件，所以在绘图时先要让demo container先绘图 */
    rtgui_container_event_handler(object, event);

    /* 获得控件所属的DC */
    dc = rtgui_dc_begin_drawing(widget);
    if (dc == RT_NULL) /* 如果不能正常获得DC，返回（如果控件或父控件是隐藏状态，DC是获取不成功的） */
        return;

    /* 获得demo container允许绘图的区域 */
    demo_view_get_logic_rect(RTGUI_CONTAINER(widget), &rect);

    /* 擦除所有 */
    RTGUI_WIDGET_BACKGROUND(widget) = default_background;
    rtgui_dc_fill_rect(dc, &rect);

    /* 显示提示 */
    rtgui_dc_draw_text(dc, "按任意键开始/停止测试...", &rect);

    /* 绘图完成 */
    rtgui_dc_end_drawing(dc);
}

rt_bool_t benchmark_event_handler(struct rtgui_object *object, rtgui_event_t *event)
{
    if (event->type == RTGUI_EVENT_PAINT)
    {
        _draw_default(object, event);
    }
    else if (event->type == RTGUI_EVENT_KBD)
    {
        struct rtgui_event_kbd *kbd = (struct rtgui_event_kbd *)event;

        if (kbd->key == RTGUIK_LEFT || kbd->key == RTGUIK_RIGHT)
            return RT_FALSE;

        if (RTGUI_KBD_IS_UP(kbd))
        {
            if (running)
            {
                /* stop */
                rtgui_app_set_onidle(RT_NULL);
                _draw_default(object, event);
            }
            else
            {
                /* run */
                rtgui_app_set_onidle(_onidle);
            }

            running = !running;
        }
        return RT_TRUE;
    }
    else
    {
        /* 调用默认的事件处理函数 */
        return rtgui_container_event_handler(object, event);
    }

    return RT_FALSE;
}

static rt_bool_t _benchmark_onshow(struct rtgui_object *obj, struct rtgui_event *ev)
{
    rtgui_widget_focus(RTGUI_WIDGET(obj));
    return RT_TRUE;
}

rtgui_container_t *demo_view_benchmark(void)
{
    srand(100);
    container = demo_view("绘图测试");
    RTGUI_WIDGET(container)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
    rtgui_object_set_event_handler(RTGUI_OBJECT(container), benchmark_event_handler);
    rtgui_widget_set_onshow(RTGUI_WIDGET(container), _benchmark_onshow);

    return container;
}