src/events/SDL_dropevents.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2019 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, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"

/* Drag and drop event handling code for SDL */

#include "SDL_events.h"
#include "SDL_events_c.h"
#include "SDL_dropevents_c.h"

#include "../video/SDL_sysvideo.h"  /* for SDL_Window internals. */


static int
SDL_SendDrop(SDL_Window *window, const SDL_EventType evtype, const char *data)
{
    static SDL_bool app_is_dropping = SDL_FALSE;
    int posted = 0;

    /* Post the event, if desired */
    if (SDL_GetEventState(evtype) == SDL_ENABLE) {
        const SDL_bool need_begin = window ? !window->is_dropping : !app_is_dropping;
        SDL_Event event;

        if (need_begin) {
            SDL_zero(event);
            event.type = SDL_DROPBEGIN;

            if (window) {
                event.drop.windowID = window->id;
            }

            posted = (SDL_PushEvent(&event) > 0);
            if (!posted) {
                return 0;
            }
            if (window) {
                window->is_dropping = SDL_TRUE;
            } else {
                app_is_dropping = SDL_TRUE;
            }
        }

        SDL_zero(event);
        event.type = evtype;
        event.drop.file = data ? SDL_strdup(data) : NULL;
        event.drop.windowID = window ? window->id : 0;
        posted = (SDL_PushEvent(&event) > 0);

        if (posted && (evtype == SDL_DROPCOMPLETE)) {
            if (window) {
                window->is_dropping = SDL_FALSE;
            } else {
                app_is_dropping = SDL_FALSE;
            }
        }
    }
    return posted;
}

int
SDL_SendDropFile(SDL_Window *window, const char *file)
{
    return SDL_SendDrop(window, SDL_DROPFILE, file);
}

int
SDL_SendDropText(SDL_Window *window, const char *text)
{
    return SDL_SendDrop(window, SDL_DROPTEXT, text);
}

int
SDL_SendDropComplete(SDL_Window *window)
{
    return SDL_SendDrop(window, SDL_DROPCOMPLETE, NULL);
}


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