Qt 事件处理 快捷键

<pre name="code" class="cpp"><span style="font-size:14px;">#include "mainwindow.h"
#include <QKeyEvent>
#include <QMessageBox>
#include <QDebug>
#include <QShortcut>
#include <QPushButton>
#include <QHBoxLayout>
#include <QAction>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{    
    // 设置窗口布局
    QWidget *mainWidget = new QWidget(this);

    QPushButton *button1 = new QPushButton("MessageBoxA", this);
    QPushButton *button2 = new QPushButton("MessageBoxB", this);

    QHBoxLayout *layout = new QHBoxLayout(this);

    layout->addWidget(button1);
    layout->addWidget(button2);

    mainWidget->setLayout(layout);

    this->setCentralWidget(mainWidget);
    this->resize(200, 100);
    this->setWindowTitle("Test");

    // 创建QAction并设置快捷键
    QAction *actionA = new QAction(this);
    actionA->setShortcut(QKeySequence(tr("Ctrl+A")));
    // actionA->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_A));

    QAction *actionB = new QAction(this);
    actionB->setShortcut(QKeySequence(tr("Ctrl+B")));
    // actionA->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_B));

    // 给button添加快捷键
    // this->addAction(actionA);// 没用

    button1->addAction(actionA);// 必须将快捷键添加到按钮上,同时使keyPressEvent失效，无法捕捉到Ctrl+A
    button2->addAction(actionB);

    // 设置快捷键相应
    connect(actionA, &QAction::triggered, this, &MainWindow::button1_click);
    connect(actionB, &QAction::triggered, this, &MainWindow::button2_click);
    // 设置按钮点击事件相应
    connect(button1, &QPushButton::clicked, this, &MainWindow::button1_click);
    connect(button2, &QPushButton::clicked, this, &MainWindow::button2_click);

    // 占用快捷键，使keyPressEvent函数失效
    QShortcut *shortCut1 = new QShortcut(QKeySequence(tr("Delete")), this);
    QShortcut *shortCut2 = new QShortcut(QKeySequence(tr("Return")), this);
    // QShortcut *shortCut2 = new QShortcut(tr("Return"), this);
}

MainWindow::~MainWindow()
{

}
// 如果快捷键被设置，keyPressevent就无法处理相应的按钮事件
void MainWindow::keyPressEvent(QKeyEvent *event)
{
    switch (event->key())
    {
        case Qt::Key_0:
        {
            qDebug() << Qt::Key_0;
            QMessageBox::about(NULL, "0", "0");
            break;
        }
        case Qt::Key_Return:// 被占用，失效
        {
            qDebug() << Qt::Key_Return;
            QMessageBox::about(NULL, "return", "return");
            break;
        }
        case Qt::Key_Delete:// 被占用，失效
        {
            qDebug() << Qt::Key_Delete;
            QMessageBox::about(NULL, "Delete", "Delete");
            break;
        }
        case QKeySequence::Delete:// 捕获不到，不能有这种方式处理
        {
            qDebug() << QKeySequence::Delete;
            QMessageBox::about(NULL, "QKeySequence::Delete", "QKeySequence::Delete");
            break;
        }
        case Qt::Key_F1:
        {
            qDebug() << Qt::Key_F1;
            QMessageBox::about(NULL, "F1", "F1");
            break;
        }
        case Qt::Key_O:// 处理组合快捷按钮
        {
            if (event->modifiers() & Qt::ControlModifier)
            {
                QMessageBox::about(NULL, "Ctr+O", "Ctr+O");
            }
            break;
        }
        case Qt::Key_A:// 被窗口button占用，失效，不能处理
        {
            if (event->modifiers() & Qt::ControlModifier)
            {
                QMessageBox::about(NULL, "Ctr+A", "Ctr+A");
            }
            break;
        }
        default:
        {
            qDebug() << event->key();
        }
    }
//    if (event->key() == Qt::Key_O)
//    {
//        if (event->modifiers() & Qt::ControlModifier)
//        {
//            QMessageBox::about(NULL, "Ctr+O", "Ctr+O");
//        }
    //    }
}

void MainWindow::keyReleaseEvent(QKeyEvent *event)
{

}

void MainWindow::button1_click()
{
    QMessageBox::about(NULL, "MessageBoxA", "MessageBoxA");
}

void MainWindow::button2_click()
{
    QMessageBox::about(NULL, "MessageBoxB", "MessageBoxB");
}
</span>