如何根据当前的键盘布局从QKeyEvent中捕获QKeySequence？

Question

为了配置我的应用程序，我需要这样做。我有一个重新实现了keyPressEvent方法的QLineEdit字段。

QKeyEvent *ke = ...
QString txt;

if(ke->modifiers() & Qt::ControlModifier)
    txt += "Ctrl+";
if(ke->modifiers() & Qt::AltModifier)
    txt += "Alt+";
if(ke->modifiers() & Qt::ShiftModifier)
    txt += "Shift+";

if(ke->key() >= Qt::Key_0 && ke->key() <= Qt::Key_9)
    txt += ('0' + ke->key() - Qt::Key_0);
else if(ke->key() >= Qt::Key_A && ke->key() <= Qt::Key_Z)
    txt += ('A' + ke->key() - Qt::Key_A);
ui->hotkeyEdit->setText(txt);

但此解决方案只能使用英文字符创建快捷方式。例如，当我使用俄语键盘布局时，此代码将显示相同的序列，但带有英文字符，放置在相同的键盘键上。

Answer 1

您可能会发现非常有用的是函数QKeySequence().toString()。

下面是我用来捕获用户定义快捷键的代码的一部分。通过一些修改，它可以在你的项目中做任何你需要的事情。希望它能有所帮助(很抱歉我的标识很糟糕)：

if (event->type() == QEvent::KeyPress){ 
    QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event); 

    int keyInt = keyEvent->key(); 
    Qt::Key key = static_cast<Qt::Key>(keyInt); 
    if(key == Qt::Key_unknown){ 
        qDebug() << "Unknown key from a macro probably"; 
        return; 
    } 
    // the user have clicked just and only the special keys Ctrl, Shift, Alt, Meta. 
    if(key == Qt::Key_Control || 
        key == Qt::Key_Shift || 
        key == Qt::Key_Alt || 
        key == Qt::Key_Meta)
    { 
        qDebug() << "Single click of special key: Ctrl, Shift, Alt or Meta"; 
        qDebug() << "New KeySequence:" << QKeySequence(keyInt).toString(QKeySequence::NativeText); 
        return; 
    } 

    // check for a combination of user clicks 
    Qt::KeyboardModifiers modifiers = keyEvent->modifiers(); 
    QString keyText = keyEvent->text(); 
    // if the keyText is empty than it's a special key like F1, F5, ... 
    qDebug() << "Pressed Key:" << keyText; 

    QList<Qt::Key> modifiersList; 
    if(modifiers & Qt::ShiftModifier) 
        keyInt += Qt::SHIFT; 
    if(modifiers & Qt::ControlModifier) 
        keyInt += Qt::CTRL; 
    if(modifiers & Qt::AltModifier) 
        keyInt += Qt::ALT; 
    if(modifiers & Qt::MetaModifier) 
        keyInt += Qt::META; 

    qDebug() << "New KeySequence:" << QKeySequence(keyInt).toString(QKeySequence::NativeText); 
}

Answer 2

如果有人关心上面Tihomir Dolapchiev的解决方案的python版本。我刚刚翻译了它，它工作得很好。只是为了将来的参考而发布。

class KeySequenceEdit(QtGui.QLineEdit):
    """
    This class is mainly inspired by
    http://stackoverflow.com/a/6665017

    """

    def __init__(self, keySequence, *args):
        super(KeySequenceEdit, self).__init__(*args)

        self.keySequence = keySequence
        self.setKeySequence(keySequence)

    def setKeySequence(self, keySequence):
        self.keySequence = keySequence
        self.setText(self.keySequence.toString(QtGui.QKeySequence.NativeText))


    def keyPressEvent(self, e):
        if e.type() == QtCore.QEvent.KeyPress:
            key = e.key()

            if key == QtCore.Qt.Key_unknown:
                warnings.warn("Unknown key from a macro probably")
                return

            # the user have clicked just and only the special keys Ctrl, Shift, Alt, Meta.
            if(key == QtCore.Qt.Key_Control or
            key == QtCore.Qt.Key_Shift or
            key == QtCore.Qt.Key_Alt or
            key == QtCore.Qt.Key_Meta):
                print("Single click of special key: Ctrl, Shift, Alt or Meta")
                print("New KeySequence:", QtGui.QKeySequence(key).toString(QtGui.QKeySequence.NativeText))
                return

            # check for a combination of user clicks
            modifiers = e.modifiers()
            keyText = e.text()
            # if the keyText is empty than it's a special key like F1, F5, ...
            print("Pressed Key:", keyText)

            if modifiers & QtCore.Qt.ShiftModifier:
                key += QtCore.Qt.SHIFT
            if modifiers & QtCore.Qt.ControlModifier:
                key += QtCore.Qt.CTRL
            if modifiers & QtCore.Qt.AltModifier:
                key += QtCore.Qt.ALT
            if modifiers & QtCore.Qt.MetaModifier:
                key += QtCore.Qt.META

            print("New KeySequence:", QtGui.QKeySequence(key).toString(QtGui.QKeySequence.NativeText))

            self.setKeySequence(QtGui.QKeySequence(key))

Answer 3

您可以为操作指定键盘快捷键。

这里有一些方法可以做到。

actionName->setShortcut(QKeySequence::New); //for predefined shortcuts like new, close, open..

或者您可以使用下面的代码定义您自己的快捷方式

actionName->setShortcut(QKeySequence("Ctrl+N")); // sets Ctrl + N for w.e the action does

在第一种情况下，qt会自动检测并为该特定操作分配适当的快捷键。在第二种情况下，您可以选择自己想要的快捷方式，并将其键入为字符串。它会自动解析并理解它。

这就避免了将键捕获用于不必要的目的的需要。