Question

我正在尝试过滤按键/释放事件，以便为我的应用程序设置长按事件的计时器（例如，当按下错误3秒钟时弹出菜单）。我遇到了一些与QKeyEvent自动重复不一致的问题。这是我的代码：

Mainview::Mainview (QWidget *parent) :
    QMainWindow (parent)
{
    setupUi (this);
    qApp->installEventFilter(this); // event filter for key presses
    ...
}

void Mainview::ControlsPressEvent(QKeyEvent *event)
{
    if ((event->isAutoRepeat()))
    {
        return;
    }

    QString s = QString("Key PRESS event: %1.").arg(event->text());
    qDebug() << s;
}

void Mainview::ControlsReleaseEvent(QKeyEvent *event)
{
    if ((event->isAutoRepeat()))
    {
        return;
    }

    QString s = QString("Key RELEASE event: %1.").arg(event->text());
    qDebug() << s;
}

bool Mainview::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::KeyPress)
    {
        qDebug() << event << " | " << obj;
        /* Only grab the key event from the parent window object */
        if (obj->objectName() == "MainviewClassWindow")
        {
            this->ControlsPressEvent(dynamic_cast<QKeyEvent*>(event));
            return true;
        }
    }
    else if (event->type() == QEvent::KeyRelease)
    {
        qDebug() << event << " | " << obj;
        /* Only grab the key event from the parent window object */
        if (obj->objectName() == "MainviewClassWindow")
        {
            this->ControlsReleaseEvent(dynamic_cast<QKeyEvent*>(event));
            return true;
        }
    }
    else
    {
        return QObject::eventFilter(obj, event);
    }

    return false;
}

有时它有效，有时则不然：

这是一个工作示例中的qDebug输出，我按一次键，按住并释放：

"Key PRESS event: ."
QKeyEvent(KeyRelease, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
QKeyEvent(KeyPress, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
QKeyEvent(KeyRelease, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
QKeyEvent(KeyPress, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
QKeyEvent(KeyRelease, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
QKeyEvent(KeyPress, Key_Down, autorepeat, count=1)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key RELEASE event: ."

这是一个非工作示例中的qDebug输出，我按下该键一次，按住并释放：

QKeyEvent(KeyPress, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key PRESS event: ."
QKeyEvent(KeyRelease, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key RELEASE event: ."
QKeyEvent(KeyPress, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key PRESS event: ."
QKeyEvent(KeyRelease, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key RELEASE event: ."
QKeyEvent(KeyPress, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key PRESS event: ."
QKeyEvent(KeyRelease, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key RELEASE event: ."
QKeyEvent(KeyPress, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key PRESS event: ."
QKeyEvent(KeyRelease, Key_Down)  |  QWidgetWindow(0xa522a0, name = "MainviewClassWindow")
"Key RELEASE event: ."

为什么QKeyEvent的autorepeat成员在设置时不一致？也许这是按键，按住和释放处理的错误方法？

由于

Qt如何使用自动重复过滤keyPressEvent

0 个答案: