QSlider 拖动滑动条使用valueChanged(int value)信号重复调用槽函数问题解决

废话不多说，直接上代码，关键点： 一个变量和三个信号

bool m_sliderPressed

void sliderPressed()

void sliderReleased()

void valueChanged(int value)

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include 

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    void sliderValueChanged(int value);

private slots:

    void on_horizontalSlider_valueChanged(int value);

    void on_horizontalSlider_sliderPressed();

    void on_horizontalSlider_sliderReleased();

private:

    Ui::MainWindow *ui;

    bool m_sliderPressed;

};

#endif//MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include 

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    m_sliderPressed = false;

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::sliderValueChanged(int value)

{

    qDebug() << "sliderValueChanged:" << value;

    ui->lineEdit->setText(QString::number(value));

}

void MainWindow::on_horizontalSlider_valueChanged(int value)

{

    if(!m_sliderPressed)

    {

        sliderValueChanged(value);

    }

}

void MainWindow::on_horizontalSlider_sliderPressed()

{

    m_sliderPressed = true;

}

void MainWindow::on_horizontalSlider_sliderReleased()

{

    m_sliderPressed = false;

    int value = ui->horizontalSlider->value();

    sliderValueChanged(value);

}