Atlas - SDL_messagebox.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 * # CategoryMessagebox
24 *
25 * SDL offers a simple message box API, which is useful for simple alerts,
26 * such as informing the user when something fatal happens at startup without
27 * the need to build a UI for it (or informing the user _before_ your UI is
28 * ready).
29 *
30 * These message boxes are native system dialogs where possible.
31 *
32 * There is both a customizable function (SDL_ShowMessageBox()) that offers
33 * lots of options for what to display and reports on what choice the user
34 * made, and also a much-simplified version (SDL_ShowSimpleMessageBox()),
35 * merely takes a text message and title, and waits until the user presses a
36 * single "OK" UI button. Often, this is all that is necessary.
37 */
38
39#ifndef SDL_messagebox_h_
40#define SDL_messagebox_h_
41
42#include <SDL3/SDL_stdinc.h>
43#include <SDL3/SDL_error.h>
44#include <SDL3/SDL_video.h>      /* For SDL_Window */
45
46#include <SDL3/SDL_begin_code.h>
47/* Set up for C function definitions, even when using C++ */
48#ifdef __cplusplus
49extern "C" {
50#endif
51
52/**
53 * Message box flags.
54 *
55 * If supported will display warning icon, etc.
56 *
57 * \since This datatype is available since SDL 3.2.0.
58 */
59typedef Uint32 SDL_MessageBoxFlags;
60
61#define SDL_MESSAGEBOX_ERROR                    0x00000010u /**< error dialog */
62#define SDL_MESSAGEBOX_WARNING                  0x00000020u /**< warning dialog */
63#define SDL_MESSAGEBOX_INFORMATION              0x00000040u /**< informational dialog */
64#define SDL_MESSAGEBOX_BUTTONS_LEFT_TO_RIGHT    0x00000080u /**< buttons placed left to right */
65#define SDL_MESSAGEBOX_BUTTONS_RIGHT_TO_LEFT    0x00000100u /**< buttons placed right to left */
66
67/**
68 * SDL_MessageBoxButtonData flags.
69 *
70 * \since This datatype is available since SDL 3.2.0.
71 */
72typedef Uint32 SDL_MessageBoxButtonFlags;
73
74#define SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT 0x00000001u /**< Marks the default button when return is hit */
75#define SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT 0x00000002u /**< Marks the default button when escape is hit */
76
77/**
78 * Individual button data.
79 *
80 * \since This struct is available since SDL 3.2.0.
81 */
82typedef struct SDL_MessageBoxButtonData
83{
84    SDL_MessageBoxButtonFlags flags;
85    int buttonID;       /**< User defined button id (value returned via SDL_ShowMessageBox) */
86    const char *text;   /**< The UTF-8 button text */
87} SDL_MessageBoxButtonData;
88
89/**
90 * RGB value used in a message box color scheme
91 *
92 * \since This struct is available since SDL 3.2.0.
93 */
94typedef struct SDL_MessageBoxColor
95{
96    Uint8 r, g, b;
97} SDL_MessageBoxColor;
98
99/**
100 * An enumeration of indices inside the colors array of
101 * SDL_MessageBoxColorScheme.
102 */
103typedef enum SDL_MessageBoxColorType
104{
105    SDL_MESSAGEBOX_COLOR_BACKGROUND,
106    SDL_MESSAGEBOX_COLOR_TEXT,
107    SDL_MESSAGEBOX_COLOR_BUTTON_BORDER,
108    SDL_MESSAGEBOX_COLOR_BUTTON_BACKGROUND,
109    SDL_MESSAGEBOX_COLOR_BUTTON_SELECTED,
110    SDL_MESSAGEBOX_COLOR_COUNT                    /**< Size of the colors array of SDL_MessageBoxColorScheme. */
111} SDL_MessageBoxColorType;
112
113/**
114 * A set of colors to use for message box dialogs
115 *
116 * \since This struct is available since SDL 3.2.0.
117 */
118typedef struct SDL_MessageBoxColorScheme
119{
120    SDL_MessageBoxColor colors[SDL_MESSAGEBOX_COLOR_COUNT];
121} SDL_MessageBoxColorScheme;
122
123/**
124 * MessageBox structure containing title, text, window, etc.
125 *
126 * \since This struct is available since SDL 3.2.0.
127 */
128typedef struct SDL_MessageBoxData
129{
130    SDL_MessageBoxFlags flags;
131    SDL_Window *window;                 /**< Parent window, can be NULL */
132    const char *title;                  /**< UTF-8 title */
133    const char *message;                /**< UTF-8 message text */
134
135    int numbuttons;
136    const SDL_MessageBoxButtonData *buttons;
137
138    const SDL_MessageBoxColorScheme *colorScheme;   /**< SDL_MessageBoxColorScheme, can be NULL to use system settings */
139} SDL_MessageBoxData;
140
141/**
142 * Create a modal message box.
143 *
144 * If your needs aren't complex, it might be easier to use
145 * SDL_ShowSimpleMessageBox.
146 *
147 * This function should be called on the thread that created the parent
148 * window, or on the main thread if the messagebox has no parent. It will
149 * block execution of that thread until the user clicks a button or closes the
150 * messagebox.
151 *
152 * This function may be called at any time, even before SDL_Init(). This makes
153 * it useful for reporting errors like a failure to create a renderer or
154 * OpenGL context.
155 *
156 * On X11, SDL rolls its own dialog box with X11 primitives instead of a
157 * formal toolkit like GTK+ or Qt.
158 *
159 * Note that if SDL_Init() would fail because there isn't any available video
160 * target, this function is likely to fail for the same reasons. If this is a
161 * concern, check the return value from this function and fall back to writing
162 * to stderr if you can.
163 *
164 * \param messageboxdata the SDL_MessageBoxData structure with title, text and
165 *                       other options.
166 * \param buttonid the pointer to which user id of hit button should be
167 *                 copied.
168 * \returns true on success or false on failure; call SDL_GetError() for more
169 *          information.
170 *
171 * \since This function is available since SDL 3.2.0.
172 *
173 * \sa SDL_ShowSimpleMessageBox
174 */
175extern SDL_DECLSPEC bool SDLCALL SDL_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid);
176
177/**
178 * Display a simple modal message box.
179 *
180 * If your needs aren't complex, this function is preferred over
181 * SDL_ShowMessageBox.
182 *
183 * `flags` may be any of the following:
184 *
185 * - `SDL_MESSAGEBOX_ERROR`: error dialog
186 * - `SDL_MESSAGEBOX_WARNING`: warning dialog
187 * - `SDL_MESSAGEBOX_INFORMATION`: informational dialog
188 *
189 * This function should be called on the thread that created the parent
190 * window, or on the main thread if the messagebox has no parent. It will
191 * block execution of that thread until the user clicks a button or closes the
192 * messagebox.
193 *
194 * This function may be called at any time, even before SDL_Init(). This makes
195 * it useful for reporting errors like a failure to create a renderer or
196 * OpenGL context.
197 *
198 * On X11, SDL rolls its own dialog box with X11 primitives instead of a
199 * formal toolkit like GTK+ or Qt.
200 *
201 * Note that if SDL_Init() would fail because there isn't any available video
202 * target, this function is likely to fail for the same reasons. If this is a
203 * concern, check the return value from this function and fall back to writing
204 * to stderr if you can.
205 *
206 * \param flags an SDL_MessageBoxFlags value.
207 * \param title UTF-8 title text.
208 * \param message UTF-8 message text.
209 * \param window the parent window, or NULL for no parent.
210 * \returns true on success or false on failure; call SDL_GetError() for more
211 *          information.
212 *
213 * \since This function is available since SDL 3.2.0.
214 *
215 * \sa SDL_ShowMessageBox
216 */
217extern SDL_DECLSPEC bool SDLCALL SDL_ShowSimpleMessageBox(SDL_MessageBoxFlags flags, const char *title, const char *message, SDL_Window *window);
218
219
220/* Ends C function definitions when using C++ */
221#ifdef __cplusplus
222}
223#endif
224#include <SDL3/SDL_close_code.h>
225
226#endif /* SDL_messagebox_h_ */
227
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