1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <input/Input.h>
20 #include <android/keycodes.h>
21 #include <unordered_map>
22
23 namespace android {
24
25 template<typename T, size_t N>
size(T (&)[N])26 size_t size(T (&)[N]) { return N; }
27
28 struct InputEventLabel {
29 const char *literal;
30 int value;
31 };
32
33 struct EvdevEventLabel {
34 std::string type;
35 std::string code;
36 std::string value;
37 };
38
39 // NOTE: If you want a new key code, axis code, led code or flag code in keylayout file,
40 // then you must add it to InputEventLabels.cpp.
41
42 class InputEventLookup {
43 /**
44 * This class is not purely static, but uses a singleton pattern in order to delay the
45 * initialization of the maps that it contains. If it were purely static, the maps could be
46 * created early, and would cause sanitizers to report memory leaks.
47 */
48 public:
49 InputEventLookup(InputEventLookup& other) = delete;
50
51 void operator=(const InputEventLookup&) = delete;
52
53 static std::optional<int> lookupValueByLabel(const std::unordered_map<std::string, int>& map,
54 const char* literal);
55
56 static const char* lookupLabelByValue(const std::vector<InputEventLabel>& vec, int value);
57
58 static std::optional<int> getKeyCodeByLabel(const char* label);
59
60 static const char* getLabelByKeyCode(int32_t keyCode);
61
62 static std::optional<int> getKeyFlagByLabel(const char* label);
63
64 static std::optional<int> getAxisByLabel(const char* label);
65
66 static const char* getAxisLabel(int32_t axisId);
67
68 static std::optional<int> getLedByLabel(const char* label);
69
70 static EvdevEventLabel getLinuxEvdevLabel(int32_t type, int32_t code, int32_t value);
71
72 private:
73 InputEventLookup();
74
get()75 static const InputEventLookup& get() {
76 static InputEventLookup sLookup;
77 return sLookup;
78 }
79
80 const std::unordered_map<std::string, int> KEYCODES;
81
82 const std::vector<InputEventLabel> KEY_NAMES;
83
84 const std::unordered_map<std::string, int> AXES;
85
86 const std::vector<InputEventLabel> AXES_NAMES;
87
88 const std::unordered_map<std::string, int> LEDS;
89
90 const std::unordered_map<std::string, int> FLAGS;
91 };
92
93 } // namespace android
94