Qt5界面回调函数Function callbacks

Qt5控件有一些回调函数，方便写各种相应的动作。

相应头文件

#include <QResizeEvent>
#include <QKeyEvent>
#include <QMouseEvent>

一些回调函数

public:
    void resizeEvent(QResizeEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void keyReleaseEvent(QKeyEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);

例子

void MainWindow::resizeEvent(QResizeEvent *event) {
    qDebug() << "Old size:" << event->oldSize() << ", New size:" << event->size();
}

void MainWindow::keyPressEvent(QKeyEvent *event) {
    if (event->key() == Qt::Key_Escape) {
        this->close();
    }
    qDebug() << event->text() << "has been pressed";
}

例子

void MainWindow::keyReleaseEvent(QKeyEvent *event) {
    qDebug() << event->text() << "has been released";
}
void MainWindow::mouseMoveEvent(QMouseEvent *event) {
    qDebug() << "Position: " << event->pos();
}

void MainWindow::mousePressEvent(QMouseEvent *event) {
    qDebug() << "Mouse pressed:" << event->button();
}

void MainWindow::mouseReleaseEvent(QMouseEvent *event) {
    qDebug() << "Mouse released:" << event->button();
}

多谢，亲爱的美美。