SDL/test/testhittesting.c

/*
  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>

/* !!! FIXME: rewrite this to be wired in to test framework. */

#define RESIZE_BORDER 20

const SDL_Rect drag_areas[] = {
    { 20, 20, 100, 100 },
    { 200, 70, 100, 100 },
    { 400, 90, 100, 100 }
};

static const SDL_Rect *areas = drag_areas;
static int numareas = SDL_arraysize(drag_areas);

static SDL_HitTestResult SDLCALL
hitTest(SDL_Window *window, const SDL_Point *pt, void *data)
{
    int i;
    int w, h;

    for (i = 0; i < numareas; i++) {
        if (SDL_IsPointInRect(pt, &areas[i])) {
            SDL_Log("HIT-TEST: DRAGGABLE\n");
            return SDL_HITTEST_DRAGGABLE;
        }
    }

    SDL_GetWindowSize(window, &w, &h);

#define REPORT_RESIZE_HIT(name)                  \
    {                                            \
        SDL_Log("HIT-TEST: RESIZE_" #name "\n"); \
        return SDL_HITTEST_RESIZE_##name;        \
    }

    if (pt->x < RESIZE_BORDER && pt->y < RESIZE_BORDER) {
        REPORT_RESIZE_HIT(TOPLEFT);
    } else if (pt->x > RESIZE_BORDER && pt->x < w - RESIZE_BORDER && pt->y < RESIZE_BORDER) {
        REPORT_RESIZE_HIT(TOP);
    } else if (pt->x > w - RESIZE_BORDER && pt->y < RESIZE_BORDER) {
        REPORT_RESIZE_HIT(TOPRIGHT);
    } else if (pt->x > w - RESIZE_BORDER && pt->y > RESIZE_BORDER && pt->y < h - RESIZE_BORDER) {
        REPORT_RESIZE_HIT(RIGHT);
    } else if (pt->x > w - RESIZE_BORDER && pt->y > h - RESIZE_BORDER) {
        REPORT_RESIZE_HIT(BOTTOMRIGHT);
    } else if (pt->x < w - RESIZE_BORDER && pt->x > RESIZE_BORDER && pt->y > h - RESIZE_BORDER) {
        REPORT_RESIZE_HIT(BOTTOM);
    } else if (pt->x < RESIZE_BORDER && pt->y > h - RESIZE_BORDER) {
        REPORT_RESIZE_HIT(BOTTOMLEFT);
    } else if (pt->x < RESIZE_BORDER && pt->y < h - RESIZE_BORDER && pt->y > RESIZE_BORDER) {
        REPORT_RESIZE_HIT(LEFT);
    }

    SDL_Log("HIT-TEST: NORMAL\n");
    return SDL_HITTEST_NORMAL;
}

int main(int argc, char **argv)
{
    int done = 0;
    SDL_Window *window;
    SDL_Renderer *renderer;

    /* !!! FIXME: check for errors. */
    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("Drag the red boxes", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_BORDERLESS | SDL_WINDOW_RESIZABLE);
    renderer = SDL_CreateRenderer(window, NULL, 0);

    if (SDL_SetWindowHitTest(window, hitTest, NULL) == -1) {
        SDL_Log("Enabling hit-testing failed!\n");
        SDL_Quit();
        return 1;
    }

    while (!done) {
        SDL_Event e;
        int nothing_to_do = 1;

        SDL_SetRenderDrawColor(renderer, 0, 0, 127, 255);
        SDL_RenderClear(renderer);
        SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
        SDL_RenderFillRects(renderer, areas, SDL_arraysize(drag_areas));
        SDL_RenderPresent(renderer);

        while (SDL_PollEvent(&e)) {
            nothing_to_do = 0;

            switch (e.type) {
            case SDL_MOUSEBUTTONDOWN:
                SDL_Log("button down!\n");
                break;

            case SDL_MOUSEBUTTONUP:
                SDL_Log("button up!\n");
                break;

            case SDL_WINDOWEVENT_MOVED:
                SDL_Log("Window event moved to (%d, %d)!\n", (int)e.window.data1, (int)e.window.data2);
                break;

            case SDL_KEYDOWN:
                if (e.key.keysym.sym == SDLK_ESCAPE) {
                    done = 1;
                } else if (e.key.keysym.sym == SDLK_x) {
                    if (areas == NULL) {
                        areas = drag_areas;
                        numareas = SDL_arraysize(drag_areas);
                    } else {
                        areas = NULL;
                        numareas = 0;
                    }
                }
                break;

            case SDL_QUIT:
                done = 1;
                break;
            }
        }

        if (nothing_to_do) {
            SDL_Delay(50);
        }
    }

    SDL_Quit();
    return 0;
}