0306作业

1：是进度条通过线程自己动起来

thread.h

#ifndef THREAD_H
#define THREAD_H

#include <QThread>

class Thread : public QThread
{
    Q_OBJECT

public:
    Thread(QObject *parent = nullptr);
    void setMax(int value);

signals:
    void valueChanged(int value);

protected:
    void run() override;

private:
    int currentValue;
    int max;
};

#endif // THREAD_H

 widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QSlider>
#include <QVBoxLayout>
#include "thread.h"

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void updateSlider(int value);

private:
    QSlider *slider;
    Thread *thread; // 使用 Thread 类
};

#endif // WIDGET_H

 thread.cpp

#include "thread.h"

Thread::Thread(QObject *parent)
    : QThread(parent), currentValue(0), max(100)
{
}

void Thread::setMax(int value)
{
    max = value;
}

void Thread::run()
{
    while (currentValue <= max && !isInterruptionRequested())
    {
        currentValue++;
        emit valueChanged(currentValue);
        msleep(100); 
    }
}

 widget.cpp

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    // 创建滑块
    slider = new QSlider(Qt::Horizontal, this);
    slider->setRange(0, 100); // 设置滑块范围
    slider->setValue(0);      // 初始值为0

    // 设置QSS样式
    slider->setStyleSheet(
        "QSlider::groove:horizontal {"
        "background: #444; height: 4px; border-radius: 2px;}"
        "QSlider::handle:horizontal {"
        "background: #ff0000; width: 10px; border-radius: 5px;}"
        "QSlider::sub-page:horizontal {"
        "background: #00ff00; border-radius: 2px;}");

    // 创建布局并添加滑块
    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(slider);
    setLayout(layout);

    // 初始化工作线程
    thread = new Thread(this);
    connect(thread, &Thread::valueChanged, this, &Widget::updateSlider);
    thread->setMax(slider->maximum());
    thread->start(); // 启动线程
}

Widget::~Widget()
{
    thread->requestInterruption(); // 请求中断线程
    thread->wait();                // 等待线程结束
    delete thread;
}

void Widget::updateSlider(int value)
{
    slider->setValue(value); // 更新滑块值
}