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1 /*
2  * Copyright (C) 2010 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 #ifndef _LIBINPUT_KEYBOARD_H
18 #define _LIBINPUT_KEYBOARD_H
19 
20 #include <input/Input.h>
21 #include <input/InputDevice.h>
22 #include <input/InputEventLabels.h>
23 #include <input/PropertyMap.h>
24 #include <utils/Errors.h>
25 
26 namespace android {
27 
28 class KeyLayoutMap;
29 class KeyCharacterMap;
30 
31 /**
32  * Loads the key layout map and key character map for a keyboard device.
33  */
34 class KeyMap {
35 public:
36     std::string keyLayoutFile;
37     std::shared_ptr<KeyLayoutMap> keyLayoutMap;
38 
39     std::string keyCharacterMapFile;
40     std::shared_ptr<KeyCharacterMap> keyCharacterMap;
41 
42     KeyMap();
43     ~KeyMap();
44 
45     status_t load(const InputDeviceIdentifier& deviceIdenfier,
46             const PropertyMap* deviceConfiguration);
47 
haveKeyLayout()48     inline bool haveKeyLayout() const {
49         return !keyLayoutFile.empty();
50     }
51 
haveKeyCharacterMap()52     inline bool haveKeyCharacterMap() const {
53         return !keyCharacterMapFile.empty();
54     }
55 
isComplete()56     inline bool isComplete() const {
57         return haveKeyLayout() && haveKeyCharacterMap();
58     }
59 
60 private:
61     bool probeKeyMap(const InputDeviceIdentifier& deviceIdentifier, const std::string& name);
62     status_t loadKeyLayout(const InputDeviceIdentifier& deviceIdentifier, const std::string& name);
63     status_t loadKeyCharacterMap(const InputDeviceIdentifier& deviceIdentifier,
64                                  const std::string& name);
65 };
66 
67 /**
68  * Returns true if the keyboard is eligible for use as a built-in keyboard.
69  */
70 extern bool isEligibleBuiltInKeyboard(const InputDeviceIdentifier& deviceIdentifier,
71         const PropertyMap* deviceConfiguration, const KeyMap* keyMap);
72 
73 /**
74  * Updates a meta state field when a key is pressed or released.
75  */
76 extern int32_t updateMetaState(int32_t keyCode, bool down, int32_t oldMetaState);
77 
78 /**
79  * Normalizes the meta state such that if either the left or right modifier
80  * meta state bits are set then the result will also include the universal
81  * bit for that modifier.
82  */
83 extern int32_t normalizeMetaState(int32_t oldMetaState);
84 
85 /**
86  * Returns true if a key is a meta key like ALT or CAPS_LOCK.
87  */
88 extern bool isMetaKey(int32_t keyCode);
89 
90 } // namespace android
91 
92 #endif // _LIBINPUT_KEYBOARD_H
93