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KeyCodeMap_Internal.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
6 #define FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
7
8 #import <Cocoa/Cocoa.h>
9 #include <cinttypes>
10 #include <vector>
11
12 namespace flutter {
13
14 /**
15 * Maps macOS-specific key code values representing |PhysicalKeyboardKey|.
16 *
17 * MacOS doesn't provide a scan code, but a virtual keycode to represent a physical key.
18 */
19 extern const NSDictionary* keyCodeToPhysicalKey;
20
21 /**
22 * A map from macOS key codes to Flutter's logical key values.
23 *
24 * This is used to derive logical keys that can't or shouldn't be derived from
25 * |charactersIgnoringModifiers|.
26 */
27 extern const NSDictionary* keyCodeToLogicalKey;
28
29 // Several mask constants. See KeyCodeMap.g.mm for their descriptions.
30
31 /**
32 * Mask for the 32-bit value portion of the key code.
33 */
34 extern const uint64_t kValueMask;
35
36 /**
37 * The plane value for keys which have a Unicode representation.
38 */
39 extern const uint64_t kUnicodePlane;
40
41 /**
42 * The plane value for the private keys defined by the macOS embedding.
43 */
44 extern const uint64_t kMacosPlane;
45
46 /**
47 * Map |NSEvent.keyCode| to its corresponding bitmask of NSEventModifierFlags.
48 *
49 * This does not include CapsLock, for it is handled specially.
50 */
51 extern const NSDictionary* keyCodeToModifierFlag;
52
53 /**
54 * Map a bit of bitmask of NSEventModifierFlags to its corresponding
55 * |NSEvent.keyCode|.
56 *
57 * This does not include CapsLock, for it is handled specially.
58 */
59 extern const NSDictionary* modifierFlagToKeyCode;
60
61 /**
62 * The physical key for CapsLock, which needs special handling.
63 */
64 extern const uint64_t kCapsLockPhysicalKey;
65
66 /**
67 * The logical key for CapsLock, which needs special handling.
68 */
69 extern const uint64_t kCapsLockLogicalKey;
70
71 /**
72 * Bits in |NSEvent.modifierFlags| indicating whether a modifier key is pressed.
73 *
74 * These constants are not written in the official documentation, but derived
75 * from experiments. This is currently the only way to know whether a one-side
76 * modifier key (such as ShiftLeft) is pressed, instead of the general combined
77 * modifier state (such as Shift).
78 */
79 typedef enum {
80 kModifierFlagControlLeft = 0x1,
81 kModifierFlagShiftLeft = 0x2,
82 kModifierFlagShiftRight = 0x4,
83 kModifierFlagMetaLeft = 0x8,
84 kModifierFlagMetaRight = 0x10,
85 kModifierFlagAltLeft = 0x20,
86 kModifierFlagAltRight = 0x40,
87 kModifierFlagControlRight = 0x200,
88 } ModifierFlag;
89
90 /**
91 * A character that Flutter wants to derive layout for, and guides on how to
92 * derive it.
93 */
94 typedef struct {
95 // The key code for a key that prints `keyChar` in the US keyboard layout.
96 uint16_t keyCode;
97
98 // The printable string to derive logical key for.
99 uint64_t keyChar;
100
101 // If the goal is mandatory, the keyboard manager will make sure to find a
102 // logical key for this character, falling back to the US keyboard layout.
103 bool mandatory;
104 } LayoutGoal;
105
106 /**
107 * All keys that Flutter wants to derive layout for, and guides on how to derive
108 * them.
109 */
110 extern const std::vector<LayoutGoal> kLayoutGoals;
111
112 } // namespace flutter
113
114 #endif // FLUTTER_SHELL_PLATFORM_DARWIN_MACOS_FRAMEWORK_SOURCE_KEYCODEMAP_INTERNAL_H_
flutter
Definition: AccessibilityBridgeMac.h:16
flutter::keyCodeToLogicalKey
const NSDictionary * keyCodeToLogicalKey
Definition: KeyCodeMap.g.mm:149
flutter::kUnicodePlane
const uint64_t kUnicodePlane
Definition: KeyCodeMap.g.mm:23
flutter::kLayoutGoals
const std::vector< LayoutGoal > kLayoutGoals
Definition: KeyCodeMap.g.mm:248
flutter::keyCodeToPhysicalKey
const NSDictionary * keyCodeToPhysicalKey
Definition: KeyCodeMap.g.mm:26
flutter::keyCodeToModifierFlag
const NSDictionary * keyCodeToModifierFlag
Definition: KeyCodeMap.g.mm:223
flutter::kValueMask
const uint64_t kValueMask
Definition: KeyCodeMap.g.mm:22
flutter::kCapsLockLogicalKey
const uint64_t kCapsLockLogicalKey
Definition: KeyCodeMap.g.mm:246
flutter::modifierFlagToKeyCode
const NSDictionary * modifierFlagToKeyCode
Definition: KeyCodeMap.g.mm:234
flutter::kMacosPlane
const uint64_t kMacosPlane
Definition: KeyCodeMap.g.mm:24
flutter::kCapsLockPhysicalKey
const uint64_t kCapsLockPhysicalKey
Definition: KeyCodeMap.g.mm:245
flutter::ModifierFlag
ModifierFlag
Definition: KeyCodeMap_Internal.h:79
flutter::kModifierFlagShiftLeft
@ kModifierFlagShiftLeft
Definition: KeyCodeMap_Internal.h:81
flutter::kModifierFlagAltLeft
@ kModifierFlagAltLeft
Definition: KeyCodeMap_Internal.h:85
flutter::kModifierFlagMetaRight
@ kModifierFlagMetaRight
Definition: KeyCodeMap_Internal.h:84
flutter::kModifierFlagMetaLeft
@ kModifierFlagMetaLeft
Definition: KeyCodeMap_Internal.h:83
flutter::kModifierFlagControlLeft
@ kModifierFlagControlLeft
Definition: KeyCodeMap_Internal.h:80
flutter::kModifierFlagAltRight
@ kModifierFlagAltRight
Definition: KeyCodeMap_Internal.h:86
flutter::kModifierFlagControlRight
@ kModifierFlagControlRight
Definition: KeyCodeMap_Internal.h:87
flutter::kModifierFlagShiftRight
@ kModifierFlagShiftRight
Definition: KeyCodeMap_Internal.h:82
flutter::LayoutGoal
Definition: KeyCodeMap_Internal.h:94
flutter::LayoutGoal::keyChar
uint64_t keyChar
Definition: KeyCodeMap_Internal.h:99
flutter::LayoutGoal::mandatory
bool mandatory
Definition: KeyCodeMap_Internal.h:103
flutter::LayoutGoal::keyCode
uint16_t keyCode
Definition: KeyCodeMap_Internal.h:96