C++11 Qt之QFutureWatcher lambda

QFuture 表示异步计算的结果，QFutureWatcher 则允许使用信号和槽监视 QFuture，也就是说，QFutureWatcher 是为 QFuture 而生的。

// 实例化对象，并连接到 finished() 信号。
MyClass myObject;
QFutureWatcher<int> watcher;
connect(&watcher, SIGNAL(finished()), &myObject, SLOT(handleFinished()));// 开始计算
QFuture<int> future = QtConcurrent::run(...);
watcher.setFuture(future);

 使用 lambda

     if(nullptr == WidgetWatcher){WidgetWatcher = new QFutureWatcher<void>;connect(WidgetWatcher, &QFutureWatcher<void>::finished, this, [=]() {qDebug()<<"finish threadid "<<QThread::currentThreadId();mQProgressDialog->close();});}QFuture<void> future = QtConcurrent::run([=]() {//slotShowInsertionWidget();qDebug()<<"111 threadid "<<QThread::currentThreadId();QThread::sleep(3);getTextStaticFun();});WidgetWatcher->setFuture(future);

传参：

// 传入 当前 this
QFuture<void> future = QtConcurrent::run([&]() 

还可以使用 QProgressDialog  作为阻堵 函数，变成同步；

  progress->exec();

完成后，关闭；

        connect(WidgetWatcher, &QFutureWatcher<void>::finished, this, [=]() {qDebug()<<"finish threadid "<<QThread::currentThreadId();mQProgressDialog->close();});

MyQProgressDialog 

#ifndef MYPROGRESSDIALOG_H
#define MYPROGRESSDIALOG_H#include<QProgressDialog>
class  MyProgressDialog :public QProgressDialog
{Q_OBJECT
public:MyProgressDialog(const QString &labelText);
};#include "myprogressdialog.h"
#include<QProgressBar>
MyProgressDialog::MyProgressDialog(const QString &labelText)
{setAutoClose(false);		//进度达到最大值时不关闭，默认为true// setLabelText("正在导出数据，请稍后...");	//显示的文本setLabelText(labelText);setCancelButton(NULL);			//不显示取消按钮setWindowModality(Qt::WindowModal);//mQProgressDialog->setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint);setWindowFlags(Qt::FramelessWindowHint | Qt::Dialog | Qt::WindowStaysOnTopHint);setMinimumWidth(600);// setWindowModality(Qt::ApplicationModal);//setModal(true);QProgressBar * prog = new QProgressBar(this);prog->setTextVisible(false);//prog->setStyleSheet("QProgressBar{  max-height: 20px;\nbackground: #323232;\nborder-radius: 10px;\ntext-align:center;\n}\nQProgressBar::chunk {  background: #2C6ED5;\nborder-radius: 10px;\n}");prog->setRange(0, 0);setBar(prog);//mQProgressDialog->hide();reset();
}