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Tidy up and comment.
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Thomas Harte
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@ -5,7 +5,7 @@
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// Qt is the worst.
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//
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// Assume your keyboard has a key labelled both . and >, as they do on US and UK keyboards. Call it the dot key.
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// Assume your keyboard has a key labelled both . and >, as on US and UK keyboards. Call it the dot key.
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// Perform the following:
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// 1. press dot key;
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// 2. press shift key;
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@ -27,8 +27,7 @@
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//
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// So how can you track the physical keys on a keyboard via Qt?
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//
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// You can't. Qt is the worst. SDL doesn't have this problem, including in X11, but I'm not sure I want the extra
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// dependency. I may need to reassess.
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// You can't. Qt is the worst. SDL doesn't have this problem, including in X11, but I don't want the non-Qt dependency.
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#ifdef Q_OS_LINUX
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#define HAS_X11
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@ -50,92 +49,96 @@ KeyboardMapper::KeyboardMapper() {
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using Key = Inputs::Keyboard::Key;
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constexpr DesiredMapping mappings[] = {
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{XK_Escape, Key::Escape},
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{XK_F1, Key::F1}, {XK_F2, Key::F2}, {XK_F3, Key::F3}, {XK_F4, Key::F4}, {XK_F5, Key::F5},
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{XK_F6, Key::F6}, {XK_F7, Key::F7}, {XK_F8, Key::F8}, {XK_F9, Key::F9}, {XK_F10, Key::F10},
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{XK_F11, Key::F11}, {XK_F12, Key::F12},
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{XK_Sys_Req, Key::PrintScreen},
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{XK_Scroll_Lock, Key::ScrollLock},
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{XK_Pause, Key::Pause},
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{XK_Escape, Key::Escape},
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{XK_F1, Key::F1}, {XK_F2, Key::F2}, {XK_F3, Key::F3}, {XK_F4, Key::F4}, {XK_F5, Key::F5},
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{XK_F6, Key::F6}, {XK_F7, Key::F7}, {XK_F8, Key::F8}, {XK_F9, Key::F9}, {XK_F10, Key::F10},
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{XK_F11, Key::F11}, {XK_F12, Key::F12},
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{XK_Sys_Req, Key::PrintScreen},
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{XK_Scroll_Lock, Key::ScrollLock},
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{XK_Pause, Key::Pause},
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{XK_grave, Key::BackTick},
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{XK_1, Key::k1}, {XK_2, Key::k2}, {XK_3, Key::k3}, {XK_4, Key::k4}, {XK_5, Key::k5},
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{XK_6, Key::k6}, {XK_7, Key::k7}, {XK_8, Key::k8}, {XK_9, Key::k9}, {XK_0, Key::k0},
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{XK_minus, Key::Hyphen},
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{XK_equal, Key::Equals},
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{XK_BackSpace, Key::Backspace},
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{XK_grave, Key::BackTick},
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{XK_1, Key::k1}, {XK_2, Key::k2}, {XK_3, Key::k3}, {XK_4, Key::k4}, {XK_5, Key::k5},
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{XK_6, Key::k6}, {XK_7, Key::k7}, {XK_8, Key::k8}, {XK_9, Key::k9}, {XK_0, Key::k0},
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{XK_minus, Key::Hyphen},
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{XK_equal, Key::Equals},
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{XK_BackSpace, Key::Backspace},
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{XK_Tab, Key::Tab},
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{XK_Q, Key::Q}, {XK_W, Key::W}, {XK_E, Key::E}, {XK_R, Key::R}, {XK_T, Key::T},
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{XK_Y, Key::Y}, {XK_U, Key::U}, {XK_I, Key::I}, {XK_O, Key::O}, {XK_P, Key::P},
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{XK_bracketleft, Key::OpenSquareBracket},
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{XK_bracketright, Key::CloseSquareBracket},
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{XK_backslash, Key::Backslash},
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{XK_Tab, Key::Tab},
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{XK_Q, Key::Q}, {XK_W, Key::W}, {XK_E, Key::E}, {XK_R, Key::R}, {XK_T, Key::T},
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{XK_Y, Key::Y}, {XK_U, Key::U}, {XK_I, Key::I}, {XK_O, Key::O}, {XK_P, Key::P},
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{XK_bracketleft, Key::OpenSquareBracket},
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{XK_bracketright, Key::CloseSquareBracket},
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{XK_backslash, Key::Backslash},
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{XK_Caps_Lock, Key::CapsLock},
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{XK_A, Key::A}, {XK_S, Key::S}, {XK_D, Key::D}, {XK_F, Key::F}, {XK_G, Key::G},
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{XK_H, Key::H}, {XK_J, Key::J}, {XK_K, Key::K}, {XK_L, Key::L},
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{XK_semicolon, Key::Semicolon},
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{XK_apostrophe, Key::Quote},
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{XK_Return, Key::Enter},
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{XK_Caps_Lock, Key::CapsLock},
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{XK_A, Key::A}, {XK_S, Key::S}, {XK_D, Key::D}, {XK_F, Key::F}, {XK_G, Key::G},
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{XK_H, Key::H}, {XK_J, Key::J}, {XK_K, Key::K}, {XK_L, Key::L},
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{XK_semicolon, Key::Semicolon},
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{XK_apostrophe, Key::Quote},
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{XK_Return, Key::Enter},
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{XK_Shift_L, Key::LeftShift},
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{XK_Z, Key::Z}, {XK_X, Key::X}, {XK_C, Key::C}, {XK_V, Key::V},
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{XK_B, Key::B}, {XK_N, Key::N}, {XK_M, Key::M},
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{XK_comma, Key::Comma},
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{XK_period, Key::FullStop},
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{XK_slash, Key::ForwardSlash},
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{XK_Shift_R, Key::RightShift},
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{XK_Shift_L, Key::LeftShift},
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{XK_Z, Key::Z}, {XK_X, Key::X}, {XK_C, Key::C}, {XK_V, Key::V},
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{XK_B, Key::B}, {XK_N, Key::N}, {XK_M, Key::M},
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{XK_comma, Key::Comma},
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{XK_period, Key::FullStop},
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{XK_slash, Key::ForwardSlash},
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{XK_Shift_R, Key::RightShift},
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{XK_Control_L, Key::LeftControl},
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{XK_Control_R, Key::RightControl},
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{XK_Alt_L, Key::LeftOption},
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{XK_Alt_R, Key::RightOption},
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{XK_Meta_L, Key::LeftMeta},
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{XK_Meta_R, Key::RightMeta},
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{XK_space, Key::Space},
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{XK_Control_L, Key::LeftControl},
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{XK_Control_R, Key::RightControl},
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{XK_Alt_L, Key::LeftOption},
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{XK_Alt_R, Key::RightOption},
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{XK_Meta_L, Key::LeftMeta},
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{XK_Meta_R, Key::RightMeta},
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{XK_space, Key::Space},
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{XK_Left, Key::Left}, {XK_Right, Key::Right}, {XK_Up, Key::Up}, {XK_Down, Key::Down},
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{XK_Left, Key::Left}, {XK_Right, Key::Right}, {XK_Up, Key::Up}, {XK_Down, Key::Down},
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{XK_Insert, Key::Insert},
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{XK_Delete, Key::Delete},
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{XK_Home, Key::Home},
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{XK_End, Key::End},
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{XK_Insert, Key::Insert},
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{XK_Delete, Key::Delete},
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{XK_Home, Key::Home},
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{XK_End, Key::End},
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{XK_Num_Lock, Key::NumLock},
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{XK_Num_Lock, Key::NumLock},
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{XK_KP_Divide, Key::KeypadSlash},
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{XK_KP_Multiply, Key::KeypadAsterisk},
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{XK_KP_Delete, Key::KeypadDelete},
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{XK_KP_7, Key::Keypad7}, {XK_KP_8, Key::Keypad8}, {XK_KP_9, Key::Keypad9}, {XK_KP_Add, Key::KeypadPlus},
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{XK_KP_4, Key::Keypad4}, {XK_KP_5, Key::Keypad5}, {XK_KP_6, Key::Keypad6}, {XK_KP_Subtract, Key::KeypadMinus},
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{XK_KP_1, Key::Keypad1}, {XK_KP_2, Key::Keypad2}, {XK_KP_3, Key::Keypad3}, {XK_KP_Enter, Key::KeypadEnter},
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{XK_KP_0, Key::Keypad0},
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{XK_KP_Decimal, Key::KeypadDecimalPoint},
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{XK_KP_Equal, Key::KeypadEquals},
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{XK_KP_Divide, Key::KeypadSlash},
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{XK_KP_Multiply, Key::KeypadAsterisk},
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{XK_KP_Delete, Key::KeypadDelete},
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{XK_KP_7, Key::Keypad7}, {XK_KP_8, Key::Keypad8}, {XK_KP_9, Key::Keypad9}, {XK_KP_Add, Key::KeypadPlus},
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{XK_KP_4, Key::Keypad4}, {XK_KP_5, Key::Keypad5}, {XK_KP_6, Key::Keypad6}, {XK_KP_Subtract, Key::KeypadMinus},
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{XK_KP_1, Key::Keypad1}, {XK_KP_2, Key::Keypad2}, {XK_KP_3, Key::Keypad3}, {XK_KP_Enter, Key::KeypadEnter},
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{XK_KP_0, Key::Keypad0},
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{XK_KP_Decimal, Key::KeypadDecimalPoint},
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{XK_KP_Equal, Key::KeypadEquals},
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{XK_Help, Key::Help},
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{XK_Help, Key::Help},
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{0}
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{0}
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};
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// Extra level of nonsense here:
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//
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// (1) assume a PC-esque keyboard, with a close-to-US/UK layout;
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// (2) from there, use any of the X11 KeySyms I'd expect to be achievable from each physical key to
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// look up the X11 KeyCode;
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// (3) henceforth, map from X11 KeyCode to the Inputs::Keyboard::Key.
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const DesiredMapping *mapping = mappings;
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while(mapping->source != 0) {
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const auto sym = XKeysymToKeycode(QX11Info::display(), mapping->source);
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keyByKeySym[sym] = mapping->destination;
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const auto code = XKeysymToKeycode(QX11Info::display(), mapping->source);
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keyByKeySym[code] = mapping->destination;
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++mapping;
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}
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#endif
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}
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std::optional<Inputs::Keyboard::Key> KeyboardMapper::keyForEvent(QKeyEvent *event) {
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// Workaround for X11: assume PC-esque mapping.
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#ifdef HAS_X11
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if(QGuiApplication::platformName() == QLatin1String("xcb")) {
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const auto sym = keyByKeySym.find(event->nativeScanCode());
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if(sym == keyByKeySym.end()) return std::nullopt;
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return sym->second;
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const auto key = keyByKeySym.find(event->nativeScanCode());
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if(key == keyByKeySym.end()) return std::nullopt;
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return key->second;
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}
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#endif
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