1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23// Drag and drop event handling code for SDL
24
25#include "SDL_events_c.h"
26#include "SDL_dropevents_c.h"
27
28#include "../video/SDL_sysvideo.h" // for SDL_Window internals.
29
30static bool SDL_SendDrop(SDL_Window *window, const SDL_EventType evtype, const char *source, const char *data, float x, float y)
31{
32 static bool app_is_dropping = false;
33 static float last_drop_x = 0;
34 static float last_drop_y = 0;
35 bool posted = false;
36
37 // Post the event, if desired
38 if (SDL_EventEnabled(evtype)) {
39 const bool need_begin = window ? !window->is_dropping : !app_is_dropping;
40 SDL_Event event;
41
42 if (need_begin) {
43 SDL_zero(event);
44 event.type = SDL_EVENT_DROP_BEGIN;
45 event.common.timestamp = 0;
46 event.drop.windowID = window ? window->id : 0;
47 posted = SDL_PushEvent(&event);
48 if (!posted) {
49 return false;
50 }
51 if (window) {
52 window->is_dropping = true;
53 } else {
54 app_is_dropping = true;
55 }
56 }
57
58 SDL_zero(event);
59 event.type = evtype;
60 event.common.timestamp = 0;
61 if (source) {
62 event.drop.source = SDL_CreateTemporaryString(source);
63 if (!event.drop.source) {
64 return false;
65 }
66 }
67 if (data) {
68 event.drop.data = SDL_CreateTemporaryString(data);
69 if (!event.drop.data) {
70 return false;
71 }
72 }
73 event.drop.windowID = window ? window->id : 0;
74
75 if (evtype == SDL_EVENT_DROP_POSITION) {
76 last_drop_x = x;
77 last_drop_y = y;
78 }
79 event.drop.x = last_drop_x;
80 event.drop.y = last_drop_y;
81 posted = SDL_PushEvent(&event);
82
83 if (posted && (evtype == SDL_EVENT_DROP_COMPLETE)) {
84 if (window) {
85 window->is_dropping = false;
86 } else {
87 app_is_dropping = false;
88 }
89
90 last_drop_x = 0;
91 last_drop_y = 0;
92 }
93 }
94 return posted;
95}
96
97bool SDL_SendDropFile(SDL_Window *window, const char *source, const char *file)
98{
99 return SDL_SendDrop(window, SDL_EVENT_DROP_FILE, source, file, 0, 0);
100}
101
102bool SDL_SendDropPosition(SDL_Window *window, float x, float y)
103{
104 return SDL_SendDrop(window, SDL_EVENT_DROP_POSITION, NULL, NULL, x, y);
105}
106
107bool SDL_SendDropText(SDL_Window *window, const char *text)
108{
109 return SDL_SendDrop(window, SDL_EVENT_DROP_TEXT, NULL, text, 0, 0);
110}
111
112bool SDL_SendDropComplete(SDL_Window *window)
113{
114 return SDL_SendDrop(window, SDL_EVENT_DROP_COMPLETE, NULL, NULL, 0, 0);
115}
116