[英]QThread::msleep() freezes program
I'm trying to create a fading effect on one of my QLabel
when the user saves their game. 当用户保存游戏时,我试图在我的
QLabel
上创建一种淡入淡出效果。
So, i thought using a QThread
would be perfect for the job but the only problem is QThread::msleep();
因此,我认为使用
QThread
非常适合这项工作,但唯一的问题是QThread::msleep();
freezes the program. 冻结程序。
I've used this technique many times before to slow down a loop but, now it just decided to freezes my program until the loop is over. 在此之前,我已经多次使用这种技术来减慢循环速度,但是现在,它决定冻结程序直到循环结束。
Does anyone have any ideas about what's going on here? 有人对这里发生的事情有任何想法吗?
I removed all the unrelated stuff cause this program is huge. 我删除了所有无关的东西,因为该程序很大。
#ifndef SAVED_H
#define SAVED_H
#include <QThread>
class Saved : public QThread
{
Q_OBJECT
public:
explicit Saved(QObject *parent = 0);
void run();
signals:
void reduceVisibility(unsigned short);
public slots:
};
#endif // SAVED_H
#include "saved.h"
Saved::Saved(QObject *parent) :
QThread(parent)
{
}
void Saved::run(){
unsigned short alpha = 250;
for(unsigned short i = 0; i <= 5; i++){
emit reduceVisibility(alpha);
alpha -= 50;
QThread::msleep(250);
}
}
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
// QThread
#include "saved.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
Saved *saving;
private slots:
public slots:
void animateSave(unsigned short);
private:
Ui::MainWindow *ui;
};
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QFile>
#include <QTextStream>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
// QThread
saving = new Saved(this);
connect(saving, SIGNAL(reduceVisibility(unsigned short)), this, SLOT(animateSave(unsigned short)));
}
MainWindow::~MainWindow()
{
delete ui;
}
// Buttons
void MainWindow::on_Btn_Save_clicked(){
QFile saveFile("save.txt");
saveFile.open(QIODevice::WriteOnly | QIODevice::Text);
QTextStream out(&saveFile);
out << user.getUsername() + "\n" + user.getLevel();
saveFile.close();
saving->run();
saving->quit();
}
// Slots
void MainWindow::animateSave(unsigned short Visibility){
QString visible = QString::number(Visibility);
ui->Lbl_Saved->setStyleSheet("color:rgb(0,255,255, " + visible + ");");
}
You may also lookup the documentation of QPropertyAnimation
and hook it on the QWidget::windowOpacity
. 您也可以查找
QPropertyAnimation
的文档,并将其挂在QWidget::windowOpacity
。 this is may be the most fitting thing for your problem. 这可能是最适合您的问题的东西。
for example: 例如:
void MyWidget::buttonClicked() // SLOT when button is clicked
{
QPropertyAnimation* anim = new QPropertyAnimation(ui->Lbl_Saved, "windowOpacity"); // new animation, hooked on the labels window opacity
anim->setDuration(2500); // use 2.5 seconds for disapearing
anim->setStartValue(1.0f); // from full visible
anim->setEndValue(0.0f); // to invisible
connect(anim, SIGNAL(finished()), anim, SLOT(deleteLater())); // delete object when animation done
anim->start();
}
Does anyone have any ideas about what's going on here?
有人对这里发生的事情有任何想法吗?
This is intended (see QThread: QObject) . 这是有意的(请参阅QThread:QObject) 。 The receiver
MainWindow
is in another thread. 接收器
MainWindow
在另一个线程中。 Since the default connection is AutoConnection
, Qt will use a QueuedConnection
and run the slot animateSave
in the same thread as your MainWindow
object. 由于默认连接为
AutoConnection
,因此Qt将使用QueuedConnection
并在与MainWindow
对象相同的线程中运行animateSave
插槽。
However, you shouldn't use QThread
at all. 但是,您根本不应该使用
QThread
。 You don't want to do things at the same time, instead, you want something to happen at (or after) a given time . 您不想同时做某事,而是希望在给定时间(或之后)发生某事。
QTimer
is what you want. QTimer
是您想要的。
MainWindow::MainWindow(QWidget *parent)
{
/* ... */
myTimer = new QTimer(this);
connect(myTimer, SIGNAL(timeout(), this, SLOT(decreaseAlphaOrStop()));
}
void MainWindow::on_Btn_Save_clicked(){
/* .. snip .. */
alpha = 250;
myTimer->start(250);
}
// new slot
void MainWindow::decreaseAlphaOrStop(){
alpha -= 50;
if( alpha < 0){
alpha = 0;
myTimer->stop();
}
animateSave(alpha);
}
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