Atlas - SDL_clipboard.h
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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
22/**
23 * # CategoryClipboard
24 *
25 * SDL provides access to the system clipboard, both for reading information
26 * from other processes and publishing information of its own.
27 *
28 * This is not just text! SDL apps can access and publish data by mimetype.
29 *
30 * ## Basic use (text)
31 *
32 * Obtaining and publishing simple text to the system clipboard is as easy as
33 * calling SDL_GetClipboardText() and SDL_SetClipboardText(), respectively.
34 * These deal with C strings in UTF-8 encoding. Data transmission and encoding
35 * conversion is completely managed by SDL.
36 *
37 * ## Clipboard callbacks (data other than text)
38 *
39 * Things get more complicated when the clipboard contains something other
40 * than text. Not only can the system clipboard contain data of any type, in
41 * some cases it can contain the same data in different formats! For example,
42 * an image painting app might let the user copy a graphic to the clipboard,
43 * and offers it in .BMP, .JPG, or .PNG format for other apps to consume.
44 *
45 * Obtaining clipboard data ("pasting") like this is a matter of calling
46 * SDL_GetClipboardData() and telling it the mimetype of the data you want.
47 * But how does one know if that format is available? SDL_HasClipboardData()
48 * can report if a specific mimetype is offered, and
49 * SDL_GetClipboardMimeTypes() can provide the entire list of mimetypes
50 * available, so the app can decide what to do with the data and what formats
51 * it can support.
52 *
53 * Setting the clipboard ("copying") to arbitrary data is done with
54 * SDL_SetClipboardData. The app does not provide the data in this call, but
55 * rather the mimetypes it is willing to provide and a callback function.
56 * During the callback, the app will generate the data. This allows massive
57 * data sets to be provided to the clipboard, without any data being copied
58 * before it is explicitly requested. More specifically, it allows an app to
59 * offer data in multiple formats without providing a copy of all of them
60 * upfront. If the app has an image that it could provide in PNG or JPG
61 * format, it doesn't have to encode it to either of those unless and until
62 * something tries to paste it.
63 *
64 * ## Primary Selection
65 *
66 * The X11 and Wayland video targets have a concept of the "primary selection"
67 * in addition to the usual clipboard. This is generally highlighted (but not
68 * explicitly copied) text from various apps. SDL offers APIs for this through
69 * SDL_GetPrimarySelectionText() and SDL_SetPrimarySelectionText(). SDL offers
70 * these APIs on platforms without this concept, too, but only so far that it
71 * will keep a copy of a string that the app sets for later retrieval; the
72 * operating system will not ever attempt to change the string externally if
73 * it doesn't support a primary selection.
74 */
75
76#ifndef SDL_clipboard_h_
77#define SDL_clipboard_h_
78
79#include <SDL3/SDL_stdinc.h>
80#include <SDL3/SDL_error.h>
81
82#include <SDL3/SDL_begin_code.h>
83/* Set up for C function definitions, even when using C++ */
84#ifdef __cplusplus
85extern "C" {
86#endif
87
88/* Function prototypes */
89
90/**
91 * Put UTF-8 text into the clipboard.
92 *
93 * \param text the text to store in the clipboard.
94 * \returns true on success or false on failure; call SDL_GetError() for more
95 *          information.
96 *
97 * \threadsafety This function should only be called on the main thread.
98 *
99 * \since This function is available since SDL 3.2.0.
100 *
101 * \sa SDL_GetClipboardText
102 * \sa SDL_HasClipboardText
103 */
104extern SDL_DECLSPEC bool SDLCALL SDL_SetClipboardText(const char *text);
105
106/**
107 * Get UTF-8 text from the clipboard.
108 *
109 * This function returns an empty string if there is not enough memory left
110 * for a copy of the clipboard's content.
111 *
112 * \returns the clipboard text on success or an empty string on failure; call
113 *          SDL_GetError() for more information. This should be freed with
114 *          SDL_free() when it is no longer needed.
115 *
116 * \threadsafety This function should only be called on the main thread.
117 *
118 * \since This function is available since SDL 3.2.0.
119 *
120 * \sa SDL_HasClipboardText
121 * \sa SDL_SetClipboardText
122 */
123extern SDL_DECLSPEC char * SDLCALL SDL_GetClipboardText(void);
124
125/**
126 * Query whether the clipboard exists and contains a non-empty text string.
127 *
128 * \returns true if the clipboard has text, or false if it does not.
129 *
130 * \threadsafety This function should only be called on the main thread.
131 *
132 * \since This function is available since SDL 3.2.0.
133 *
134 * \sa SDL_GetClipboardText
135 * \sa SDL_SetClipboardText
136 */
137extern SDL_DECLSPEC bool SDLCALL SDL_HasClipboardText(void);
138
139/**
140 * Put UTF-8 text into the primary selection.
141 *
142 * \param text the text to store in the primary selection.
143 * \returns true on success or false on failure; call SDL_GetError() for more
144 *          information.
145 *
146 * \threadsafety This function should only be called on the main thread.
147 *
148 * \since This function is available since SDL 3.2.0.
149 *
150 * \sa SDL_GetPrimarySelectionText
151 * \sa SDL_HasPrimarySelectionText
152 */
153extern SDL_DECLSPEC bool SDLCALL SDL_SetPrimarySelectionText(const char *text);
154
155/**
156 * Get UTF-8 text from the primary selection.
157 *
158 * This function returns an empty string if there is not enough memory left
159 * for a copy of the primary selection's content.
160 *
161 * \returns the primary selection text on success or an empty string on
162 *          failure; call SDL_GetError() for more information. This should be
163 *          freed with SDL_free() when it is no longer needed.
164 *
165 * \threadsafety This function should only be called on the main thread.
166 *
167 * \since This function is available since SDL 3.2.0.
168 *
169 * \sa SDL_HasPrimarySelectionText
170 * \sa SDL_SetPrimarySelectionText
171 */
172extern SDL_DECLSPEC char * SDLCALL SDL_GetPrimarySelectionText(void);
173
174/**
175 * Query whether the primary selection exists and contains a non-empty text
176 * string.
177 *
178 * \returns true if the primary selection has text, or false if it does not.
179 *
180 * \threadsafety This function should only be called on the main thread.
181 *
182 * \since This function is available since SDL 3.2.0.
183 *
184 * \sa SDL_GetPrimarySelectionText
185 * \sa SDL_SetPrimarySelectionText
186 */
187extern SDL_DECLSPEC bool SDLCALL SDL_HasPrimarySelectionText(void);
188
189/**
190 * Callback function that will be called when data for the specified mime-type
191 * is requested by the OS.
192 *
193 * The callback function is called with NULL as the mime_type when the
194 * clipboard is cleared or new data is set. The clipboard is automatically
195 * cleared in SDL_Quit().
196 *
197 * \param userdata a pointer to the provided user data.
198 * \param mime_type the requested mime-type.
199 * \param size a pointer filled in with the length of the returned data.
200 * \returns a pointer to the data for the provided mime-type. Returning NULL
201 *          or setting the length to 0 will cause zero length data to be sent
202 *          to the "receiver", which should be able to handle this. The
203 *          returned data will not be freed, so it needs to be retained and
204 *          dealt with internally.
205 *
206 * \since This function is available since SDL 3.2.0.
207 *
208 * \sa SDL_SetClipboardData
209 */
210typedef const void *(SDLCALL *SDL_ClipboardDataCallback)(void *userdata, const char *mime_type, size_t *size);
211
212/**
213 * Callback function that will be called when the clipboard is cleared, or
214 * when new data is set.
215 *
216 * \param userdata a pointer to the provided user data.
217 *
218 * \since This function is available since SDL 3.2.0.
219 *
220 * \sa SDL_SetClipboardData
221 */
222typedef void (SDLCALL *SDL_ClipboardCleanupCallback)(void *userdata);
223
224/**
225 * Offer clipboard data to the OS.
226 *
227 * Tell the operating system that the application is offering clipboard data
228 * for each of the provided mime-types. Once another application requests the
229 * data the callback function will be called, allowing it to generate and
230 * respond with the data for the requested mime-type.
231 *
232 * The size of text data does not include any terminator, and the text does
233 * not need to be null-terminated (e.g., you can directly copy a portion of a
234 * document).
235 *
236 * \param callback a function pointer to the function that provides the
237 *                 clipboard data.
238 * \param cleanup a function pointer to the function that cleans up the
239 *                clipboard data.
240 * \param userdata an opaque pointer that will be forwarded to the callbacks.
241 * \param mime_types a list of mime-types that are being offered. SDL copies
242 *                   the given list.
243 * \param num_mime_types the number of mime-types in the mime_types list.
244 * \returns true on success or false on failure; call SDL_GetError() for more
245 *          information.
246 *
247 * \threadsafety This function should only be called on the main thread.
248 *
249 * \since This function is available since SDL 3.2.0.
250 *
251 * \sa SDL_ClearClipboardData
252 * \sa SDL_GetClipboardData
253 * \sa SDL_HasClipboardData
254 */
255extern SDL_DECLSPEC bool SDLCALL SDL_SetClipboardData(SDL_ClipboardDataCallback callback, SDL_ClipboardCleanupCallback cleanup, void *userdata, const char **mime_types, size_t num_mime_types);
256
257/**
258 * Clear the clipboard data.
259 *
260 * \returns true on success or false on failure; call SDL_GetError() for more
261 *          information.
262 *
263 * \threadsafety This function should only be called on the main thread.
264 *
265 * \since This function is available since SDL 3.2.0.
266 *
267 * \sa SDL_SetClipboardData
268 */
269extern SDL_DECLSPEC bool SDLCALL SDL_ClearClipboardData(void);
270
271/**
272 * Get the data from the clipboard for a given mime type.
273 *
274 * The size of text data does not include the terminator, but the text is
275 * guaranteed to be null-terminated.
276 *
277 * \param mime_type the mime type to read from the clipboard.
278 * \param size a pointer filled in with the length of the returned data.
279 * \returns the retrieved data buffer or NULL on failure; call SDL_GetError()
280 *          for more information. This should be freed with SDL_free() when it
281 *          is no longer needed.
282 *
283 * \threadsafety This function should only be called on the main thread.
284 *
285 * \since This function is available since SDL 3.2.0.
286 *
287 * \sa SDL_HasClipboardData
288 * \sa SDL_SetClipboardData
289 */
290extern SDL_DECLSPEC void * SDLCALL SDL_GetClipboardData(const char *mime_type, size_t *size);
291
292/**
293 * Query whether there is data in the clipboard for the provided mime type.
294 *
295 * \param mime_type the mime type to check for data.
296 * \returns true if data exists in the clipboard for the provided mime type,
297 *          false if it does not.
298 *
299 * \threadsafety This function should only be called on the main thread.
300 *
301 * \since This function is available since SDL 3.2.0.
302 *
303 * \sa SDL_SetClipboardData
304 * \sa SDL_GetClipboardData
305 */
306extern SDL_DECLSPEC bool SDLCALL SDL_HasClipboardData(const char *mime_type);
307
308/**
309 * Retrieve the list of mime types available in the clipboard.
310 *
311 * \param num_mime_types a pointer filled with the number of mime types, may
312 *                       be NULL.
313 * \returns a null-terminated array of strings with mime types, or NULL on
314 *          failure; call SDL_GetError() for more information. This should be
315 *          freed with SDL_free() when it is no longer needed.
316 *
317 * \threadsafety This function should only be called on the main thread.
318 *
319 * \since This function is available since SDL 3.2.0.
320 *
321 * \sa SDL_SetClipboardData
322 */
323extern SDL_DECLSPEC char ** SDLCALL SDL_GetClipboardMimeTypes(size_t *num_mime_types);
324
325/* Ends C function definitions when using C++ */
326#ifdef __cplusplus
327}
328#endif
329#include <SDL3/SDL_close_code.h>
330
331#endif /* SDL_clipboard_h_ */
332
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