Qt / Qml 中捕获(中文)输入法事件(按下 & 提交)

#include "inputmethodeventcatch.h" #include <QInputMethodEvent> static int key2code(const QChar &key) { switch (key.toLatin1()) { case 'q': case 'Q': return Qt::Key_Q; case 'w': case 'W': return Qt::Key_W; case 'e': case 'E': return Qt::Key_E; case 'r': case 'R': return Qt::Key_R; case 't': case 'T': return Qt::Key_T; case 'y': case 'Y': return Qt::Key_Y; case 'u': case 'U': return Qt::Key_U; case 'i': case 'I': return Qt::Key_I; case 'o': case 'O': return Qt::Key_O; case 'p': case 'P': return Qt::Key_P; case 'a': case 'A': return Qt::Key_A; case 's': case 'S': return Qt::Key_S; case 'd': case 'D': return Qt::Key_D; case 'f': case 'F': return Qt::Key_F; case 'g': case 'G': return Qt::Key_G; case 'h': case 'H': return Qt::Key_H; case 'j': case 'J': return Qt::Key_J; case 'k': case 'K': return Qt::Key_K; case 'l': case 'L': return Qt::Key_L; case 'z': case 'Z': return Qt::Key_Z; case 'x': case 'X': return Qt::Key_X; case 'c': case 'C': return Qt::Key_C; case 'v': case 'V': return Qt::Key_V; case 'b': case 'B': return Qt::Key_B; case 'n': case 'N': return Qt::Key_N; case 'm': case 'M': return Qt::Key_M; } return Qt::Key_unknown; } InputMethodEventCatch::InputMethodEventCatch(QObject *parent) : QObject{parent} { } InputMethodEventCatch::~InputMethodEventCatch() { if (m_target) m_target->removeEventFilter(this); } QObject *InputMethodEventCatch::target() { return m_target; } void InputMethodEventCatch::setTarget(QObject *target) { if (!target) return; if (m_target != target) { if (m_target) m_target->removeEventFilter(this); target->installEventFilter(this); m_target = target; emit targetChanged(); } } bool InputMethodEventCatch::eventFilter(QObject *obj, QEvent *event) { if (event->type() == QEvent::InputMethod) { QInputMethodEvent *input = static_cast<QInputMethodEvent *>(event); if (input->preeditString().isEmpty()) { emit inputMethodEventCommitted(input->commitString()); } else { QString key; for (const auto &attr: input->attributes()) { if (attr.type == QInputMethodEvent::AttributeType::Cursor && attr.start > 0) { key = input->preeditString().mid(attr.start - 1, attr.length); break; } } if (key.size() == 1) emit inputMethodEventPressed(key2code(*key.begin()), key); } } return QObject::eventFilter(obj, event); }