qt-C++笔记之捕获鼠标滚轮事件并输出滚轮角度增量

笑鸿的学习笔记2024-02-18 8:36

qt-C++笔记之捕获鼠标滚轮事件并输出滚轮角度增量

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文章目录

qt-C++笔记之捕获鼠标滚轮事件并输出滚轮角度增量

1.运行

2.main.cpp

cpp 复制代码

#include <QApplication>
#include <QWidget>
#include <QWheelEvent>
#include <QDebug>

class WheelWidget : public QWidget {
protected:
    void wheelEvent(QWheelEvent *event) override {
        // 输出滚轮事件的相关信息
        qDebug() << "Wheel event delta:" << event->angleDelta();
        if (event->orientation() == Qt::Vertical) {
            qDebug() << "Vertical wheel";
        } else {
            qDebug() << "Horizontal wheel";
        }

        // Standard event processing
        event->accept();
    }
};

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    WheelWidget widget;
    widget.show();

    return QApplication::exec();
}

在WheelWidget类中，wheelEvent函数被重写。这个函数是QWidget的一个虚函数，用于处理鼠标滚轮事件。

3.main.pro

#-------------------------------------------------
#
# Project created by QtCreator
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do this, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        main.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target