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一、作业1

        将一个 QSlider，使用QSS语句，画成一个进度条：

        要画2个部分：QSlider的槽、QSlider滑块；

        进度条通过线程自己动起来。

【运行结果】：点Play按钮后，线程运行滑块从最左端向右移动到最右端停止。

【Headers / mythread.h】：

#ifndef MYTHREAD_H
#define MYTHREAD_H#include <QThread>class myThread : public QThread
{Q_OBJECT
public:explicit myThread(QObject* parent = nullptr);signals:void sendSignal();protected:virtual void run() override;
};#endif // MYTHREAD_H

【Headers / widget.h】：

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QThread>
#include "mythread.h"QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_pushButton_clicked();void rcvSignal();private:Ui::Widget *ui;myThread* thread;
};
#endif // WIDGET_H

【Sources  / mythread.cpp】：

#include "mythread.h"
#include <QDebug>
#include <QThread>myThread::myThread(QObject* parent):QThread(parent)
{}void myThread::run()
{while(!isInterruptionRequested()){ //检测线程是否被请求退出emit sendSignal();QThread::usleep(100000); // 0.1s}
}

【Sources  / widget.cpp】：

#include "widget.h"
#include "ui_widget.h"
#include "mythread.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);//QString qss = "QSlider::sub-page{background-color:blue} QSlider::groove:horizontal{background-color:red}";QString qss = "QSlider::groove:horizontal { background: gray; } ""QSlider::sub-page:horizontal { background: blue; } ""QSlider::handle:horizontal { background: white; width: 10px; }";ui->horizontalSlider->setStyleSheet(qss);ui->horizontalSlider->setMaximum(100);thread = new myThread(this);QObject::connect(thread, &myThread::sendSignal, this, &Widget::rcvSignal);
}Widget::~Widget()
{if(thread){thread->quit();thread->wait();//thread->terminate();delete thread;}delete ui;
}void Widget::on_pushButton_clicked()
{thread->start();
}void Widget::rcvSignal()
{int currentValue = ui->horizontalSlider->value();if(currentValue < ui->horizontalSlider->maximum()){ui->horizontalSlider->setValue(currentValue + 1);}
}

【Sources  / main.cpp】：

#include "widget.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}