Qt+EventFilter+给Qt对象安装事件过滤器

#include "qtguiapptest.h" #include "ui_qtguiapptest.h" QtGuiAppTest::QtGuiAppTest(QWidget *parent) : QWidget(parent) , ui(new Ui::QtGuiAppTest) { ui->setupUi(this); EnterKeyPressFilter* pEKPFilter = new EnterKeyPressFilter(this); ui->pushButton->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_B)); ui->pushButton->installEventFilter(pEKPFilter); connect(ui->pushButton, &QPushButton::clicked, this, &QtGuiAppTest::SlotTestEventFilter); } QtGuiAppTest::~QtGuiAppTest() { delete ui; } void QtGuiAppTest::SlotTestEventFilter() { ui->label->setText("test event filter"); } EnterKeyPressFilter::EnterKeyPressFilter(QWidget* parent) : QObject(parent) { } bool EnterKeyPressFilter::eventFilter(QObject* watched, QEvent* event) { if(event->type() == QEvent::MouseButtonDblClick || event->type() == QEvent::MouseButtonPress) { return true; } return QObject::eventFilter(watched, event); }