1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 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"
#include "SDL_dbus.h"
#include "SDL_system_theme.h"
#include "../../video/SDL_sysvideo.h"
#include <unistd.h>
#define PORTAL_DESTINATION "org.freedesktop.portal.Desktop"
#define PORTAL_PATH "/org/freedesktop/portal/desktop"
#define PORTAL_INTERFACE "org.freedesktop.portal.Settings"
#define PORTAL_METHOD "Read"
#define SIGNAL_INTERFACE "org.freedesktop.portal.Settings"
#define SIGNAL_NAMESPACE "org.freedesktop.appearance"
#define SIGNAL_NAME "SettingChanged"
#define SIGNAL_KEY "color-scheme"
typedef struct SystemThemeData
{
SDL_DBusContext *dbus;
SDL_SystemTheme theme;
} SystemThemeData;
static SystemThemeData system_theme_data;
static bool DBus_ExtractThemeVariant(DBusMessageIter *iter, SDL_SystemTheme *theme) {
SDL_DBusContext *dbus = system_theme_data.dbus;
Uint32 color_scheme;
DBusMessageIter variant_iter;
if (dbus->message_iter_get_arg_type(iter) != DBUS_TYPE_VARIANT)
return false;
dbus->message_iter_recurse(iter, &variant_iter);
if (dbus->message_iter_get_arg_type(&variant_iter) != DBUS_TYPE_UINT32)
return false;
dbus->message_iter_get_basic(&variant_iter, &color_scheme);
switch (color_scheme) {
case 0:
*theme = SDL_SYSTEM_THEME_UNKNOWN;
break;
case 1:
*theme = SDL_SYSTEM_THEME_DARK;
break;
case 2:
*theme = SDL_SYSTEM_THEME_LIGHT;
break;
}
return true;
}
static DBusHandlerResult DBus_MessageFilter(DBusConnection *conn, DBusMessage *msg, void *data) {
SDL_DBusContext *dbus = (SDL_DBusContext *)data;
if (dbus->message_is_signal(msg, SIGNAL_INTERFACE, SIGNAL_NAME)) {
DBusMessageIter signal_iter;
const char *namespace, *key;
dbus->message_iter_init(msg, &signal_iter);
// Check if the parameters are what we expect
if (dbus->message_iter_get_arg_type(&signal_iter) != DBUS_TYPE_STRING)
goto not_our_signal;
dbus->message_iter_get_basic(&signal_iter, &namespace);
if (SDL_strcmp(SIGNAL_NAMESPACE, namespace) != 0)
goto not_our_signal;
if (!dbus->message_iter_next(&signal_iter))
goto not_our_signal;
if (dbus->message_iter_get_arg_type(&signal_iter) != DBUS_TYPE_STRING)
goto not_our_signal;
dbus->message_iter_get_basic(&signal_iter, &key);
if (SDL_strcmp(SIGNAL_KEY, key) != 0)
goto not_our_signal;
if (!dbus->message_iter_next(&signal_iter))
goto not_our_signal;
if (!DBus_ExtractThemeVariant(&signal_iter, &system_theme_data.theme))
goto not_our_signal;
SDL_SetSystemTheme(system_theme_data.theme);
return DBUS_HANDLER_RESULT_HANDLED;
}
not_our_signal:
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
bool SDL_SystemTheme_Init(void)
{
SDL_DBusContext *dbus = SDL_DBus_GetContext();
DBusMessage *msg;
static const char *namespace = SIGNAL_NAMESPACE;
static const char *key = SIGNAL_KEY;
system_theme_data.theme = SDL_SYSTEM_THEME_UNKNOWN;
system_theme_data.dbus = dbus;
if (!dbus) {
return false;
}
msg = dbus->message_new_method_call(PORTAL_DESTINATION, PORTAL_PATH, PORTAL_INTERFACE, PORTAL_METHOD);
if (msg) {
if (dbus->message_append_args(msg, DBUS_TYPE_STRING, &namespace, DBUS_TYPE_STRING, &key, DBUS_TYPE_INVALID)) {
DBusMessage *reply = dbus->connection_send_with_reply_and_block(dbus->session_conn, msg, 300, NULL);
if (reply) {
DBusMessageIter reply_iter, variant_outer_iter;
dbus->message_iter_init(reply, &reply_iter);
// The response has signature <<u>>
if (dbus->message_iter_get_arg_type(&reply_iter) != DBUS_TYPE_VARIANT)
goto incorrect_type;
dbus->message_iter_recurse(&reply_iter, &variant_outer_iter);
if (!DBus_ExtractThemeVariant(&variant_outer_iter, &system_theme_data.theme))
goto incorrect_type;
incorrect_type:
dbus->message_unref(reply);
}
}
dbus->message_unref(msg);
}
dbus->bus_add_match(dbus->session_conn,
"type='signal', interface='"SIGNAL_INTERFACE"',"
"member='"SIGNAL_NAME"', arg0='"SIGNAL_NAMESPACE"',"
"arg1='"SIGNAL_KEY"'", NULL);
dbus->connection_add_filter(dbus->session_conn,
&DBus_MessageFilter, dbus, NULL);
dbus->connection_flush(dbus->session_conn);
return true;
}
SDL_SystemTheme SDL_SystemTheme_Get(void)
{
return system_theme_data.theme;
}
|
