普通的程序中. 鼠标事件监听
要监听鼠标事件，你可以使用QMouseEvent类，它提供了多种类型的鼠标事件，如QMouseEvent::MouseButtonPress、QMouseEvent::MouseButtonRelease、QMouseEvent::MouseMove等。
但是离开程序后就很难监听到，这里就需要用到系统api来监听
cpp
#include "globalkeyevent.h"
#if defined(Q_OS_WIN)
#include "Windows.h"
#include <QDebug>
#include <QKeyEvent>
enum WindowsNativeModifiers {
ShiftLeft = 0x00000001,
ControlLeft = 0x00000002,
AltLeft = 0x00000004,
MetaLeft = 0x00000008,
ShiftRight = 0x00000010,
ControlRight = 0x00000020,
AltRight = 0x00000040,
MetaRight = 0x00000080,
CapsLock = 0x00000100,
NumLock = 0x00000200,
ScrollLock = 0x00000400,
ExtendedKey = 0x01000000,
// Convenience mappings
ShiftAny = 0x00000011,
ControlAny = 0x00000022,
AltAny = 0x00000044,
MetaAny = 0x00000088,
LockAny = 0x00000700
};
// 值的含义:
// 0 = 字符输出键，需要键盘驱动程序映射
// Key_unknown = 未知虚拟密钥，无法转换，忽略
// Windows 到 Qt::Key映射表，在"D:\Qt\Qt5.12.5\5.12.5\Src\qtbase\src\plugins\platforms\windows\qwindowskeymapper.cpp"中有
static const uint KeyTbl[] = { // Keyboard mapping table
// Dec | Hex | Windows Virtual key
Qt::Key_unknown, // 0 0x00
Qt::Key_unknown, // 1 0x01 VK_LBUTTON | Left mouse button
Qt::Key_unknown, // 2 0x02 VK_RBUTTON | Right mouse button
Qt::Key_Cancel, // 3 0x03 VK_CANCEL | Control-Break processing
Qt::Key_unknown, // 4 0x04 VK_MBUTTON | Middle mouse button
Qt::Key_unknown, // 5 0x05 VK_XBUTTON1 | X1 mouse button
Qt::Key_unknown, // 6 0x06 VK_XBUTTON2 | X2 mouse button
Qt::Key_unknown, // 7 0x07 -- unassigned --
Qt::Key_Backspace, // 8 0x08 VK_BACK | BackSpace key
Qt::Key_Tab, // 9 0x09 VK_TAB | Tab key
Qt::Key_unknown, // 10 0x0A -- reserved --
Qt::Key_unknown, // 11 0x0B -- reserved --
Qt::Key_Clear, // 12 0x0C VK_CLEAR | Clear key
Qt::Key_Return, // 13 0x0D VK_RETURN | Enter key
Qt::Key_unknown, // 14 0x0E -- unassigned --
Qt::Key_unknown, // 15 0x0F -- unassigned --
Qt::Key_Shift, // 16 0x10 VK_SHIFT | Shift key
Qt::Key_Control, // 17 0x11 VK_CONTROL | Ctrl key
Qt::Key_Alt, // 18 0x12 VK_MENU | Alt key
Qt::Key_Pause, // 19 0x13 VK_PAUSE | Pause key
Qt::Key_CapsLock, // 20 0x14 VK_CAPITAL | Caps-Lock
Qt::Key_unknown, // 21 0x15 VK_KANA / VK_HANGUL | IME Kana or Hangul mode
Qt::Key_unknown, // 22 0x16 -- unassigned --
Qt::Key_unknown, // 23 0x17 VK_JUNJA | IME Junja mode
Qt::Key_unknown, // 24 0x18 VK_FINAL | IME final mode
Qt::Key_unknown, // 25 0x19 VK_HANJA / VK_KANJI | IME Hanja or Kanji mode
Qt::Key_unknown, // 26 0x1A -- unassigned --
Qt::Key_Escape, // 27 0x1B VK_ESCAPE | Esc key
Qt::Key_unknown, // 28 0x1C VK_CONVERT | IME convert
Qt::Key_unknown, // 29 0x1D VK_NONCONVERT | IME non-convert
Qt::Key_unknown, // 30 0x1E VK_ACCEPT | IME accept
Qt::Key_Mode_switch,// 31 0x1F VK_MODECHANGE | IME mode change request
Qt::Key_Space, // 32 0x20 VK_SPACE | Spacebar
Qt::Key_PageUp, // 33 0x21 VK_PRIOR | Page Up key
Qt::Key_PageDown, // 34 0x22 VK_NEXT | Page Down key
Qt::Key_End, // 35 0x23 VK_END | End key
Qt::Key_Home, // 36 0x24 VK_HOME | Home key
Qt::Key_Left, // 37 0x25 VK_LEFT | Left arrow key
Qt::Key_Up, // 38 0x26 VK_UP | Up arrow key
Qt::Key_Right, // 39 0x27 VK_RIGHT | Right arrow key
Qt::Key_Down, // 40 0x28 VK_DOWN | Down arrow key
Qt::Key_Select, // 41 0x29 VK_SELECT | Select key
Qt::Key_Printer, // 42 0x2A VK_PRINT | Print key
Qt::Key_Execute, // 43 0x2B VK_EXECUTE | Execute key
Qt::Key_Print, // 44 0x2C VK_SNAPSHOT | Print Screen key
Qt::Key_Insert, // 45 0x2D VK_INSERT | Ins key
Qt::Key_Delete, // 46 0x2E VK_DELETE | Del key
Qt::Key_Help, // 47 0x2F VK_HELP | Help key
0, // 48 0x30 (VK_0) | 0 key
0, // 49 0x31 (VK_1) | 1 key
0, // 50 0x32 (VK_2) | 2 key
0, // 51 0x33 (VK_3) | 3 key
0, // 52 0x34 (VK_4) | 4 key
0, // 53 0x35 (VK_5) | 5 key
0, // 54 0x36 (VK_6) | 6 key
0, // 55 0x37 (VK_7) | 7 key
0, // 56 0x38 (VK_8) | 8 key
0, // 57 0x39 (VK_9) | 9 key
Qt::Key_unknown, // 58 0x3A -- unassigned --
Qt::Key_unknown, // 59 0x3B -- unassigned --
Qt::Key_unknown, // 60 0x3C -- unassigned --
Qt::Key_unknown, // 61 0x3D -- unassigned --
Qt::Key_unknown, // 62 0x3E -- unassigned --
Qt::Key_unknown, // 63 0x3F -- unassigned --
Qt::Key_unknown, // 64 0x40 -- unassigned --
0, // 65 0x41 (VK_A) | A key
0, // 66 0x42 (VK_B) | B key
0, // 67 0x43 (VK_C) | C key
0, // 68 0x44 (VK_D) | D key
0, // 69 0x45 (VK_E) | E key
0, // 70 0x46 (VK_F) | F key
0, // 71 0x47 (VK_G) | G key
0, // 72 0x48 (VK_H) | H key
0, // 73 0x49 (VK_I) | I key
0, // 74 0x4A (VK_J) | J key
0, // 75 0x4B (VK_K) | K key
0, // 76 0x4C (VK_L) | L key
0, // 77 0x4D (VK_M) | M key
0, // 78 0x4E (VK_N) | N key
0, // 79 0x4F (VK_O) | O key
0, // 80 0x50 (VK_P) | P key
0, // 81 0x51 (VK_Q) | Q key
0, // 82 0x52 (VK_R) | R key
0, // 83 0x53 (VK_S) | S key
0, // 84 0x54 (VK_T) | T key
0, // 85 0x55 (VK_U) | U key
0, // 86 0x56 (VK_V) | V key
0, // 87 0x57 (VK_W) | W key
0, // 88 0x58 (VK_X) | X key
0, // 89 0x59 (VK_Y) | Y key
0, // 90 0x5A (VK_Z) | Z key
Qt::Key_Meta, // 91 0x5B VK_LWIN | Left Windows - MS Natural kbd
Qt::Key_Meta, // 92 0x5C VK_RWIN | Right Windows - MS Natural kbd
Qt::Key_Menu, // 93 0x5D VK_APPS | Application key-MS Natural kbd
Qt::Key_unknown, // 94 0x5E -- reserved --
Qt::Key_Sleep, // 95 0x5F VK_SLEEP
Qt::Key_0, // 96 0x60 VK_NUMPAD0 | Numeric keypad 0 key
Qt::Key_1, // 97 0x61 VK_NUMPAD1 | Numeric keypad 1 key
Qt::Key_2, // 98 0x62 VK_NUMPAD2 | Numeric keypad 2 key
Qt::Key_3, // 99 0x63 VK_NUMPAD3 | Numeric keypad 3 key
Qt::Key_4, // 100 0x64 VK_NUMPAD4 | Numeric keypad 4 key
Qt::Key_5, // 101 0x65 VK_NUMPAD5 | Numeric keypad 5 key
Qt::Key_6, // 102 0x66 VK_NUMPAD6 | Numeric keypad 6 key
Qt::Key_7, // 103 0x67 VK_NUMPAD7 | Numeric keypad 7 key
Qt::Key_8, // 104 0x68 VK_NUMPAD8 | Numeric keypad 8 key
Qt::Key_9, // 105 0x69 VK_NUMPAD9 | Numeric keypad 9 key
Qt::Key_Asterisk, // 106 0x6A VK_MULTIPLY | Multiply key
Qt::Key_Plus, // 107 0x6B VK_ADD | Add key
Qt::Key_unknown, // 108 0x6C VK_SEPARATOR | Separator key (locale-dependent)
Qt::Key_Minus, // 109 0x6D VK_SUBTRACT | Subtract key
Qt::Key_unknown, // 110 0x6E VK_DECIMAL | Decimal key (locale-dependent)
Qt::Key_Slash, // 111 0x6F VK_DIVIDE | Divide key
Qt::Key_F1, // 112 0x70 VK_F1 | F1 key
Qt::Key_F2, // 113 0x71 VK_F2 | F2 key
Qt::Key_F3, // 114 0x72 VK_F3 | F3 key
Qt::Key_F4, // 115 0x73 VK_F4 | F4 key
Qt::Key_F5, // 116 0x74 VK_F5 | F5 key
Qt::Key_F6, // 117 0x75 VK_F6 | F6 key
Qt::Key_F7, // 118 0x76 VK_F7 | F7 key
Qt::Key_F8, // 119 0x77 VK_F8 | F8 key
Qt::Key_F9, // 120 0x78 VK_F9 | F9 key
Qt::Key_F10, // 121 0x79 VK_F10 | F10 key
Qt::Key_F11, // 122 0x7A VK_F11 | F11 key
Qt::Key_F12, // 123 0x7B VK_F12 | F12 key
Qt::Key_F13, // 124 0x7C VK_F13 | F13 key
Qt::Key_F14, // 125 0x7D VK_F14 | F14 key
Qt::Key_F15, // 126 0x7E VK_F15 | F15 key
Qt::Key_F16, // 127 0x7F VK_F16 | F16 key
Qt::Key_F17, // 128 0x80 VK_F17 | F17 key
Qt::Key_F18, // 129 0x81 VK_F18 | F18 key
Qt::Key_F19, // 130 0x82 VK_F19 | F19 key
Qt::Key_F20, // 131 0x83 VK_F20 | F20 key
Qt::Key_F21, // 132 0x84 VK_F21 | F21 key
Qt::Key_F22, // 133 0x85 VK_F22 | F22 key
Qt::Key_F23, // 134 0x86 VK_F23 | F23 key
Qt::Key_F24, // 135 0x87 VK_F24 | F24 key
Qt::Key_unknown, // 136 0x88 -- unassigned --
Qt::Key_unknown, // 137 0x89 -- unassigned --
Qt::Key_unknown, // 138 0x8A -- unassigned --
Qt::Key_unknown, // 139 0x8B -- unassigned --
Qt::Key_unknown, // 140 0x8C -- unassigned --
Qt::Key_unknown, // 141 0x8D -- unassigned --
Qt::Key_unknown, // 142 0x8E -- unassigned --
Qt::Key_unknown, // 143 0x8F -- unassigned --
Qt::Key_NumLock, // 144 0x90 VK_NUMLOCK | Num Lock key
Qt::Key_ScrollLock, // 145 0x91 VK_SCROLL | Scroll Lock key
// Fujitsu/OASYS kbd --------------------
0, //Qt::Key_Jisho, // 146 0x92 VK_OEM_FJ_JISHO | 'Dictionary' key /
// VK_OEM_NEC_EQUAL = key on numpad on NEC PC-9800 kbd
Qt::Key_Massyo, // 147 0x93 VK_OEM_FJ_MASSHOU | 'Unregister word' key
Qt::Key_Touroku, // 148 0x94 VK_OEM_FJ_TOUROKU | 'Register word' key
0, //Qt::Key_Oyayubi_Left,//149 0x95 VK_OEM_FJ_LOYA | 'Left OYAYUBI' key
0, //Qt::Key_Oyayubi_Right,//150 0x96 VK_OEM_FJ_ROYA | 'Right OYAYUBI' key
Qt::Key_unknown, // 151 0x97 -- unassigned --
Qt::Key_unknown, // 152 0x98 -- unassigned --
Qt::Key_unknown, // 153 0x99 -- unassigned --
Qt::Key_unknown, // 154 0x9A -- unassigned --
Qt::Key_unknown, // 155 0x9B -- unassigned --
Qt::Key_unknown, // 156 0x9C -- unassigned --
Qt::Key_unknown, // 157 0x9D -- unassigned --
Qt::Key_unknown, // 158 0x9E -- unassigned --
Qt::Key_unknown, // 159 0x9F -- unassigned --
Qt::Key_Shift, // 160 0xA0 VK_LSHIFT | Left Shift key
Qt::Key_Shift, // 161 0xA1 VK_RSHIFT | Right Shift key
Qt::Key_Control, // 162 0xA2 VK_LCONTROL | Left Ctrl key
Qt::Key_Control, // 163 0xA3 VK_RCONTROL | Right Ctrl key
Qt::Key_Alt, // 164 0xA4 VK_LMENU | Left Menu key
Qt::Key_Alt, // 165 0xA5 VK_RMENU | Right Menu key
Qt::Key_Back, // 166 0xA6 VK_BROWSER_BACK | Browser Back key
Qt::Key_Forward, // 167 0xA7 VK_BROWSER_FORWARD | Browser Forward key
Qt::Key_Refresh, // 168 0xA8 VK_BROWSER_REFRESH | Browser Refresh key
Qt::Key_Stop, // 169 0xA9 VK_BROWSER_STOP | Browser Stop key
Qt::Key_Search, // 170 0xAA VK_BROWSER_SEARCH | Browser Search key
Qt::Key_Favorites, // 171 0xAB VK_BROWSER_FAVORITES| Browser Favorites key
Qt::Key_HomePage, // 172 0xAC VK_BROWSER_HOME | Browser Start and Home key
Qt::Key_VolumeMute, // 173 0xAD VK_VOLUME_MUTE | Volume Mute key
Qt::Key_VolumeDown, // 174 0xAE VK_VOLUME_DOWN | Volume Down key
Qt::Key_VolumeUp, // 175 0xAF VK_VOLUME_UP | Volume Up key
Qt::Key_MediaNext, // 176 0xB0 VK_MEDIA_NEXT_TRACK | Next Track key
Qt::Key_MediaPrevious, //177 0xB1 VK_MEDIA_PREV_TRACK | Previous Track key
Qt::Key_MediaStop, // 178 0xB2 VK_MEDIA_STOP | Stop Media key
Qt::Key_MediaPlay, // 179 0xB3 VK_MEDIA_PLAY_PAUSE | Play/Pause Media key
Qt::Key_LaunchMail, // 180 0xB4 VK_LAUNCH_MAIL | Start Mail key
Qt::Key_LaunchMedia,// 181 0xB5 VK_LAUNCH_MEDIA_SELECT Select Media key
Qt::Key_Launch0, // 182 0xB6 VK_LAUNCH_APP1 | Start Application 1 key
Qt::Key_Launch1, // 183 0xB7 VK_LAUNCH_APP2 | Start Application 2 key
Qt::Key_unknown, // 184 0xB8 -- reserved --
Qt::Key_unknown, // 185 0xB9 -- reserved --
0, // 186 0xBA VK_OEM_1 | ';:' for US
0, // 187 0xBB VK_OEM_PLUS | '+' any country
0, // 188 0xBC VK_OEM_COMMA | ',' any country
0, // 189 0xBD VK_OEM_MINUS | '-' any country
0, // 190 0xBE VK_OEM_PERIOD | '.' any country
0, // 191 0xBF VK_OEM_2 | '/?' for US
0, // 192 0xC0 VK_OEM_3 | '`~' for US
Qt::Key_unknown, // 193 0xC1 -- reserved --
Qt::Key_unknown, // 194 0xC2 -- reserved --
Qt::Key_unknown, // 195 0xC3 -- reserved --
Qt::Key_unknown, // 196 0xC4 -- reserved --
Qt::Key_unknown, // 197 0xC5 -- reserved --
Qt::Key_unknown, // 198 0xC6 -- reserved --
Qt::Key_unknown, // 199 0xC7 -- reserved --
Qt::Key_unknown, // 200 0xC8 -- reserved --
Qt::Key_unknown, // 201 0xC9 -- reserved --
Qt::Key_unknown, // 202 0xCA -- reserved --
Qt::Key_unknown, // 203 0xCB -- reserved --
Qt::Key_unknown, // 204 0xCC -- reserved --
Qt::Key_unknown, // 205 0xCD -- reserved --
Qt::Key_unknown, // 206 0xCE -- reserved --
Qt::Key_unknown, // 207 0xCF -- reserved --
Qt::Key_unknown, // 208 0xD0 -- reserved --
Qt::Key_unknown, // 209 0xD1 -- reserved --
Qt::Key_unknown, // 210 0xD2 -- reserved --
Qt::Key_unknown, // 211 0xD3 -- reserved --
Qt::Key_unknown, // 212 0xD4 -- reserved --
Qt::Key_unknown, // 213 0xD5 -- reserved --
Qt::Key_unknown, // 214 0xD6 -- reserved --
Qt::Key_unknown, // 215 0xD7 -- reserved --
Qt::Key_unknown, // 216 0xD8 -- unassigned --
Qt::Key_unknown, // 217 0xD9 -- unassigned --
Qt::Key_unknown, // 218 0xDA -- unassigned --
0, // 219 0xDB VK_OEM_4 | '[{' for US
0, // 220 0xDC VK_OEM_5 | '\|' for US
0, // 221 0xDD VK_OEM_6 | ']}' for US
0, // 222 0xDE VK_OEM_7 | ''"' for US
0, // 223 0xDF VK_OEM_8
Qt::Key_unknown, // 224 0xE0 -- reserved --
Qt::Key_unknown, // 225 0xE1 VK_OEM_AX | 'AX' key on Japanese AX kbd
Qt::Key_unknown, // 226 0xE2 VK_OEM_102 | "<>" or "\|" on RT 102-key kbd
Qt::Key_unknown, // 227 0xE3 VK_ICO_HELP | Help key on ICO
Qt::Key_unknown, // 228 0xE4 VK_ICO_00 | 00 key on ICO
Qt::Key_unknown, // 229 0xE5 VK_PROCESSKEY | IME Process key
Qt::Key_unknown, // 230 0xE6 VK_ICO_CLEAR |
Qt::Key_unknown, // 231 0xE7 VK_PACKET | Unicode char as keystrokes
Qt::Key_unknown, // 232 0xE8 -- unassigned --
// Nokia/Ericsson definitions ---------------
Qt::Key_unknown, // 233 0xE9 VK_OEM_RESET
Qt::Key_unknown, // 234 0xEA VK_OEM_JUMP
Qt::Key_unknown, // 235 0xEB VK_OEM_PA1
Qt::Key_unknown, // 236 0xEC VK_OEM_PA2
Qt::Key_unknown, // 237 0xED VK_OEM_PA3
Qt::Key_unknown, // 238 0xEE VK_OEM_WSCTRL
Qt::Key_unknown, // 239 0xEF VK_OEM_CUSEL
Qt::Key_unknown, // 240 0xF0 VK_OEM_ATTN
Qt::Key_unknown, // 241 0xF1 VK_OEM_FINISH
Qt::Key_unknown, // 242 0xF2 VK_OEM_COPY
Qt::Key_unknown, // 243 0xF3 VK_OEM_AUTO
Qt::Key_unknown, // 244 0xF4 VK_OEM_ENLW
Qt::Key_unknown, // 245 0xF5 VK_OEM_BACKTAB
Qt::Key_unknown, // 246 0xF6 VK_ATTN | Attn key
Qt::Key_unknown, // 247 0xF7 VK_CRSEL | CrSel key
Qt::Key_unknown, // 248 0xF8 VK_EXSEL | ExSel key
Qt::Key_unknown, // 249 0xF9 VK_EREOF | Erase EOF key
Qt::Key_Play, // 250 0xFA VK_PLAY | Play key
Qt::Key_Zoom, // 251 0xFB VK_ZOOM | Zoom key
Qt::Key_unknown, // 252 0xFC VK_NONAME | Reserved
Qt::Key_unknown, // 253 0xFD VK_PA1 | PA1 key
Qt::Key_Clear, // 254 0xFE VK_OEM_CLEAR | Clear key
0
};
static inline quint32 winceKeyBend(quint32 keyCode)
{
return KeyTbl[keyCode];
}
/**
* @brief 获取是否按下键盘修饰键，例如Ctrl、shirt等
* @return
*/
static inline Qt::KeyboardModifiers queryKeyboardModifiers()
{
Qt::KeyboardModifiers modifiers = Qt::NoModifier;
if (GetKeyState(VK_SHIFT) < 0)
modifiers |= Qt::ShiftModifier;
if (GetKeyState(VK_CONTROL) < 0)
modifiers |= Qt::ControlModifier;
if (GetKeyState(VK_MENU) < 0)
modifiers |= Qt::AltModifier;
if (GetKeyState(VK_LWIN) < 0 || GetKeyState(VK_RWIN) < 0)
modifiers |= Qt::MetaModifier;
return modifiers;
}
static uchar g_buffer[256];
/**
* @brief 将VK转换为Qt键代码或unicode字符
* @param vk
* @param scancode
* @param g_buffer
* @param isDeadkey
* @return
*/
static inline quint32 toKeyOrUnicode(quint32 vk, quint32 scancode, bool *isDeadkey = nullptr)
{
Q_ASSERT(vk > 0 && vk < 256);
GetKeyboardState(g_buffer); // // 将 256 个虚拟密钥的状态复制到指定的缓冲区。
// qDebug() <<"vk " << (g_buffer[vk] & 0x80);
g_buffer[VK_LWIN ] = 0;
g_buffer[VK_RWIN ] = 0;
g_buffer[VK_CAPITAL ] = 0;
g_buffer[VK_NUMLOCK ] = 0;
g_buffer[VK_SCROLL ] = 0;
// 始终为0，因为我们只会更改其他版本
g_buffer[VK_RSHIFT ] = 0;
g_buffer[VK_RCONTROL] = 0;
g_buffer[VK_LMENU ] = 0; // 使用右Alt，因为左Ctrl+右Alt被视为AltGraph
g_buffer[VK_CONTROL ] = 0; // 需要将ctrl键清空，否则按住Ctrl + 字母键会出现无法返回正确值的情况
quint32 code = 0;
QChar unicodeBuffer[5];
int res = ToUnicode(vk, scancode, g_buffer, reinterpret_cast<LPWSTR>(unicodeBuffer), 5, 0);
// 使用Ctrl修饰符时，ToUnicode不会返回正确的值。为了分配右键，如果上一次调用失败，则仅删除该函数的控制修饰符。
if (res == 0 && g_buffer[VK_CONTROL])
{
const unsigned char controlState = g_buffer[VK_CONTROL];
g_buffer[VK_CONTROL] = 0;
res = ToUnicode(vk, scancode, g_buffer, reinterpret_cast<LPWSTR>(unicodeBuffer), 5, 0);
g_buffer[VK_CONTROL] = controlState;
}
if (res)
{
code = unicodeBuffer[0].toUpper().unicode(); // 将字符转换位Qt::Key值
}
// Qt:：Key_*的编码不低于0x20，因此请重试，DEL键（0x7f）使用正确的Qt::Key_ code
if (code < 0x20 || code == 0x7f) // Handles res==0 too
{
code = winceKeyBend(vk);
}
if (isDeadkey)
{
*isDeadkey = (res == -1);
}
return code == Qt::Key_unknown ? 0 : code;
}
static uchar g_keyState[256];
/**
* @brief 获取当前按下键的字符
* @param vk 要转换的虚拟密钥代码
* @param scancode 要转换的密钥的硬件扫描代码
* @return
*/
static inline QString getKeyText(quint32 vk, quint32 scancode)
{
GetKeyboardState(g_keyState); // 将 256 个虚拟密钥的状态复制到指定的缓冲区。
wchar_t newKey[3] = {0};
// 将指定的虚拟键代码和键盘状态转换为相应的一个或多个 Unicode 字符。
int ret = ToUnicode(vk, // 要转换的虚拟密钥代码
scancode, // 要转换的密钥的硬件扫描代码
g_keyState, // 指向包含当前键盘状态的 256 字节数组的指针。数组中的每个元素（字节）都包含一个键的状态。
newKey, // 接收转换后的一个或多个 Unicode 字符的缓冲区
3, // 参数指向的缓冲区的大小（以字符为单位）
0); // 函数的行为。0：则菜单处于活动状态； 2，则不会更改键盘状态（Windows 10 版本 1607 及更高版本）
if (ret == 1) // 1：一个字符被写入 newKey
{
QChar uch = QChar(newKey[0]);
return uch;
}
else // 无法获取到字符
{
return QString();
}
}
/**
* @brief 获取本机修改器值
* @param flags
* @return
*/
static quint32 getNativeModifiers(quint32 flags)
{
quint32 nModifiers = 0;
// 将本机修改器映射到某些位表示
nModifiers |= (GetKeyState(VK_LSHIFT ) & 0x80 ? ShiftLeft : 0);
nModifiers |= (GetKeyState(VK_RSHIFT ) & 0x80 ? ShiftRight : 0);
nModifiers |= (GetKeyState(VK_LCONTROL) & 0x80 ? ControlLeft : 0);
nModifiers |= (GetKeyState(VK_RCONTROL) & 0x80 ? ControlRight : 0);
nModifiers |= (GetKeyState(VK_LMENU ) & 0x80 ? AltLeft : 0);
nModifiers |= (GetKeyState(VK_RMENU ) & 0x80 ? AltRight : 0);
nModifiers |= (GetKeyState(VK_LWIN ) & 0x80 ? MetaLeft : 0);
nModifiers |= (GetKeyState(VK_RWIN ) & 0x80 ? MetaRight : 0);
// 将锁定键添加到相同的位
nModifiers |= (GetKeyState(VK_CAPITAL ) & 0x01 ? CapsLock : 0);
nModifiers |= (GetKeyState(VK_NUMLOCK ) & 0x01 ? NumLock : 0);
nModifiers |= (GetKeyState(VK_SCROLL ) & 0x01 ? ScrollLock : 0);
if (flags & LLKHF_EXTENDED) // 使用扩展键，例如：Home End pgUP pgDn
{
nModifiers |= ExtendedKey;
}
return nModifiers;
}
static HHOOK g_hook = nullptr;
/**
* @brief 处理鼠标事件的回调函数，由于这不是一个成员函数，所以需要通过中间单例类mouseEvent将鼠标信号传递出来
* 具体内容看https://learn.microsoft.com/zh-cn/previous-versions/windows/desktop/legacy/ms644986(v=vs.85)
* @param nCode 挂钩过程用于确定如何处理消息的代码。如果nCode小于零，则挂钩过程必须将消息传递给 CallNextHookEx 函数而不进行进一步处理，并且应返回CallNextHookEx返回的值
* @param wParam 信号类型：WM_KEYDOWN、WM_KEYUP、WM_SYSKEYDOWN或WM_SYSKEYUP
* @param lParam MSLLHOOKSTRUCT结构体指针
* @return
*/
LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
KBDLLHOOKSTRUCT * kbdll = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
bool isDeadKey = false;
Qt::KeyboardModifiers modifiers = queryKeyboardModifiers();
int key = int(toKeyOrUnicode(kbdll->vkCode, kbdll->scanCode, &isDeadKey));
QString text = getKeyText(kbdll->vkCode, kbdll->scanCode);
quint32 nativeModifiers = getNativeModifiers(kbdll->flags);
bool autorep = (g_buffer[kbdll->vkCode] & 0x80);
switch (wParam)
{
case WM_KEYDOWN: // 按下非系统键， 非系统键是未按下 ALT 键时按下的键
{
emit GlobalKeyEvent::getInstance()->keyEvent(new QKeyEvent(QEvent::KeyPress, key, modifiers, kbdll->scanCode, kbdll->vkCode, nativeModifiers, text, autorep));
break;
}
case WM_KEYUP: // 当释放非系统键
emit GlobalKeyEvent::getInstance()->keyEvent(new QKeyEvent(QEvent::KeyRelease, key, modifiers, kbdll->scanCode, kbdll->vkCode, nativeModifiers, text, !autorep));
break;
case WM_SYSKEYDOWN: // 当用户按下 F10 键 (激活菜单栏) 或按住 Alt 键，然后按另一个键时，发布到具有键盘焦点的窗口
qDebug() << "按下系统键 Alt";
emit GlobalKeyEvent::getInstance()->keyEvent(new QKeyEvent(QEvent::KeyPress, key, modifiers, kbdll->scanCode, kbdll->vkCode, nativeModifiers, text, autorep));
break;
case WM_SYSKEYUP: // 当用户释放按下 Alt 键时按下的键
qDebug() << "释放系统键 Alt";
emit GlobalKeyEvent::getInstance()->keyEvent(new QKeyEvent(QEvent::KeyRelease, key, modifiers, kbdll->scanCode, kbdll->vkCode, nativeModifiers, text, !autorep));
break;
default:
break;
}
return CallNextHookEx(nullptr, nCode, wParam, lParam); // 注意这一行一定不能少，否则会出大问题
}
/**
* @brief 安装全局鼠标事件监听器
* @return
*/
bool GlobalKeyEvent::installKeyEvent()
{
if(g_hook) return true; // 避免重复安装
/**
* WH_KEYBOARD_LL 为全局键盘钩子, WH_MOUSE_LL 为全局鼠标钩子
* 详细说明看官方文档：https://learn.microsoft.com/zh-cn/windows/win32/api/winuser/nf-winuser-setwindowshookexw
*/
g_hook = SetWindowsHookExW(WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandleW(nullptr), 0);
return g_hook;
}
/**
* @brief 卸载全局鼠标事件监听器
* @return
*/
bool GlobalKeyEvent::removeKeyEvent()
{
if(!g_hook) return true; // 避免重复卸载
bool ret = UnhookWindowsHookEx(g_hook);
if(ret)
{
g_hook = nullptr;
return true;
}
return false;
}
#endif