SDL  2.0
SDL_ime.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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 
22 #include "SDL_ime.h"
23 #include "SDL_ibus.h"
24 #include "SDL_fcitx.h"
25 
26 typedef SDL_bool (*_SDL_IME_Init)();
27 typedef void (*_SDL_IME_Quit)();
28 typedef void (*_SDL_IME_SetFocus)(SDL_bool);
29 typedef void (*_SDL_IME_Reset)();
30 typedef SDL_bool (*_SDL_IME_ProcessKeyEvent)(Uint32, Uint32);
31 typedef void (*_SDL_IME_UpdateTextRect)(SDL_Rect *);
32 typedef void (*_SDL_IME_PumpEvents)();
33 
34 static _SDL_IME_Init SDL_IME_Init_Real = NULL;
35 static _SDL_IME_Quit SDL_IME_Quit_Real = NULL;
36 static _SDL_IME_SetFocus SDL_IME_SetFocus_Real = NULL;
37 static _SDL_IME_Reset SDL_IME_Reset_Real = NULL;
38 static _SDL_IME_ProcessKeyEvent SDL_IME_ProcessKeyEvent_Real = NULL;
39 static _SDL_IME_UpdateTextRect SDL_IME_UpdateTextRect_Real = NULL;
40 static _SDL_IME_PumpEvents SDL_IME_PumpEvents_Real = NULL;
41 
42 static void
43 InitIME()
44 {
45  static SDL_bool inited = SDL_FALSE;
46 #ifdef HAVE_FCITX_FRONTEND_H
47  const char *im_module = SDL_getenv("SDL_IM_MODULE");
48  const char *xmodifiers = SDL_getenv("XMODIFIERS");
49 #endif
50 
51  if (inited == SDL_TRUE)
52  return;
53 
54  inited = SDL_TRUE;
55 
56  /* See if fcitx IME support is being requested */
57 #ifdef HAVE_FCITX_FRONTEND_H
58  if (!SDL_IME_Init_Real &&
59  ((im_module && SDL_strcmp(im_module, "fcitx") == 0) ||
60  (!im_module && xmodifiers && SDL_strstr(xmodifiers, "@im=fcitx") != NULL))) {
61  SDL_IME_Init_Real = SDL_Fcitx_Init;
62  SDL_IME_Quit_Real = SDL_Fcitx_Quit;
63  SDL_IME_SetFocus_Real = SDL_Fcitx_SetFocus;
64  SDL_IME_Reset_Real = SDL_Fcitx_Reset;
65  SDL_IME_ProcessKeyEvent_Real = SDL_Fcitx_ProcessKeyEvent;
66  SDL_IME_UpdateTextRect_Real = SDL_Fcitx_UpdateTextRect;
67  SDL_IME_PumpEvents_Real = SDL_Fcitx_PumpEvents;
68  }
69 #endif /* HAVE_FCITX_FRONTEND_H */
70 
71  /* default to IBus */
72 #ifdef HAVE_IBUS_IBUS_H
73  if (!SDL_IME_Init_Real) {
74  SDL_IME_Init_Real = SDL_IBus_Init;
75  SDL_IME_Quit_Real = SDL_IBus_Quit;
76  SDL_IME_SetFocus_Real = SDL_IBus_SetFocus;
77  SDL_IME_Reset_Real = SDL_IBus_Reset;
78  SDL_IME_ProcessKeyEvent_Real = SDL_IBus_ProcessKeyEvent;
79  SDL_IME_UpdateTextRect_Real = SDL_IBus_UpdateTextRect;
80  SDL_IME_PumpEvents_Real = SDL_IBus_PumpEvents;
81  }
82 #endif /* HAVE_IBUS_IBUS_H */
83 }
84 
85 SDL_bool
86 SDL_IME_Init(void)
87 {
88  InitIME();
89 
90  if (SDL_IME_Init_Real) {
91  if (SDL_IME_Init_Real()) {
92  return SDL_TRUE;
93  }
94 
95  /* uhoh, the IME implementation's init failed! Disable IME support. */
96  SDL_IME_Init_Real = NULL;
97  SDL_IME_Quit_Real = NULL;
98  SDL_IME_SetFocus_Real = NULL;
99  SDL_IME_Reset_Real = NULL;
100  SDL_IME_ProcessKeyEvent_Real = NULL;
101  SDL_IME_UpdateTextRect_Real = NULL;
102  SDL_IME_PumpEvents_Real = NULL;
103  }
104 
105  return SDL_FALSE;
106 }
107 
108 void
109 SDL_IME_Quit(void)
110 {
111  if (SDL_IME_Quit_Real)
112  SDL_IME_Quit_Real();
113 }
114 
115 void
116 SDL_IME_SetFocus(SDL_bool focused)
117 {
118  if (SDL_IME_SetFocus_Real)
119  SDL_IME_SetFocus_Real(focused);
120 }
121 
122 void
123 SDL_IME_Reset(void)
124 {
125  if (SDL_IME_Reset_Real)
126  SDL_IME_Reset_Real();
127 }
128 
129 SDL_bool
130 SDL_IME_ProcessKeyEvent(Uint32 keysym, Uint32 keycode)
131 {
132  if (SDL_IME_ProcessKeyEvent_Real)
133  return SDL_IME_ProcessKeyEvent_Real(keysym, keycode);
134 
135  return SDL_FALSE;
136 }
137 
138 void
139 SDL_IME_UpdateTextRect(SDL_Rect *rect)
140 {
141  if (SDL_IME_UpdateTextRect_Real)
142  SDL_IME_UpdateTextRect_Real(rect);
143 }
144 
145 void
146 SDL_IME_PumpEvents()
147 {
148  if (SDL_IME_PumpEvents_Real)
149  SDL_IME_PumpEvents_Real();
150 }
151 
152 /* vi: set ts=4 sw=4 expandtab: */