Qt5界面回調函數Function callbacks

Qt5控件有一些回調函數，友善寫各種相應的動作。

相應頭檔案

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

一些回調函數

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();
}
           

多謝，親愛的美美。