插槽和信号无限循环

我写的日期包含年/月/日，使用旋转盒的转换器，我想，当我改变日期，同时其他日期转换，反之亦然，所以我这样做：插槽和信号无限循环

#include "mainwindow.h" 
#include "ui_mainwindow.h" 

MainWindow::MainWindow(QWidget *parent) : 
    QMainWindow(parent), 
    ui(new Ui::MainWindow) 
{ 
    ui->setupUi(this); 
    setWindowTitle("Shamsi/Miladi Converter"); 
    setFixedSize(400, 165); 

    connect(ui->shy,SIGNAL(valueChanged(int)),this,SLOT(MiladiSet())); 
    connect(ui->shm,SIGNAL(valueChanged(int)),this,SLOT(MiladiSet())); 
    connect(ui->shd,SIGNAL(valueChanged(int)),this,SLOT(MiladiSet())); 

    connect(ui->ghy,SIGNAL(valueChanged(int)),this,SLOT(ShamsiSet())); 
    connect(ui->ghm,SIGNAL(valueChanged(int)),this,SLOT(ShamsiSet())); 
    connect(ui->ghd,SIGNAL(valueChanged(int)),this,SLOT(ShamsiSet())); 
} 

MainWindow::~MainWindow() 
{ 
    delete ui; 
} 

void MainWindow::ShamsiSet() 
{ 
    int inputYear = ui->ghy->text().toInt(); 
    int inputMonth = ui->ghm->text().toInt(); 
    int inputDay = ui->ghd->text().toInt(); 

    int year = inputYear - 1; 
    int month = inputMonth - 1; 
    int day; 

    int temp = 0; 

    int nonKabise[12] = {0,31,29,31,30,31,30,31,31,30,31,30}; 
    int kabise[12] = {0,31,28,31,30,31,30,31,31,30,31,30}; 

    if(year%4 == 0) 
    { 
     for(int i=0; i <= month; ++i) 
     { 
      temp += kabise[i]; 
     } 
     day = (year*365.25)+temp+inputDay; 

    } 
    else 
    { 
     for(int i=0; i <= month; ++i) 
     { 
      temp += nonKabise[i]; 
     } 
     day = (year*365.25)+temp+inputDay; 
    } 

    day -= 226899; 

    year = (day/365.25)+1; 
    temp = day/365.25; 

    day = day - (temp*365.25) + 0.25; 

    if  (year%4==3) day=day+1; 
    if  (day>336) month=12,day=day-336; 
    else if(day>306) month=11 ,day=day-306; 
    else if(day>276) month=10 ,day=day-276; 
    else if(day>246) month=9 ,day=day-246; 
    else if(day>216) month=8 ,day=day-216; 
    else if(day>186) month=7 ,day=day-186; 
    else if(day>155) month=6 ,day=day-155; 
    else if(day>124) month=5 ,day=day-124; 
    else if(day>93) month=4 ,day=day-93; 
    else if(day>62) month=3 ,day=day-62; 
    else if(day>31) month=2 ,day=day-31; 
    else if(day>0) month=1,day=day; 
    else if(day==0){ 
    if(year%4!=0)year=year-1,month=12,day=29; 
    else year=year-1,month=12,day=30; 
    } 

    ui->shy->setValue(year); 
    ui->shm->setValue(month); 
    ui->shd->setValue(day); 
} 

void MainWindow::MiladiSet() 
{ 
    int inputYear = ui->shy->text().toInt(); 
    int inputMonth = ui->shm->text().toInt(); 
    int inputDay = ui->shd->text().toInt(); 

    int year = inputYear - 1; 
    int month = inputMonth - 1; 
    int day = inputDay; 

    int temp = 0; 

    if(month <= 6) 
    { 
     day = (year * 365.25) + (month * 31) + day + 0.25; 
    } 
    else 
    { 
     day = (year *365.25) + (month-6)*30 + 186 + day + 0.25; 
    } 
    day += 226899; 

    year = (day/365.25) + 1; 
    temp = (day/365.25); 
    temp *= 365.25; 

    day -= temp; 

    if(year%4==0){ 
    if(day==0) year-=1,month=12,day=31; 
    if(day<=31) month=1; 
    else if(day<=60) month=2, day-=31; 
    else if(day<=91) month=3, day-=60; 
    else if(day<=121) month=4, day-=91; 
    else if(day<=152) month=5, day-=121; 
    else if(day<=182) month=6, day-=152; 
    else if(day<=213) month=7, day-=182; 
    else if(day<=244) month=8, day-=213; 
    else if(day<=274) month=9, day-=244; 
    else if(day<=305) month=10, day-=274; 
    else if(day<=335) month=11, day-=305; 
    else if(day<=366) month=12, day-=335; 
    } 

    else{ 

    if(day==0) year-=1,month=12,day=31; 
    else if(day<=31) month=1; 
    else if(day<=59) month=2, day-=31; 
    else if(day<=90) month=3, day-=59; 
    else if(day<=120) month=4, day-=90; 
    else if(day<=151) month=5, day-=120; 
    else if(day<=181) month=6, day-=151; 
    else if(day<=212) month=7, day-=181; 
    else if(day<=243) month=8, day-=212; 
    else if(day<=273) month=9, day-=243; 
    else if(day<=304) month=10, day-=273; 
    else if(day<=334) month=11, day-=304; 
    else if(day<366) month=12, day-=334; 
    else if(day=366) year+=1,month=1 , day=1; 
    } 

    ui->ghy->setValue(year); 
    ui->ghm->setValue(month); 
    ui->ghd->setValue(day); 
}

但如果我改变了第一个，我的代码进入无限循环，并使崩溃。请帮我解决这个问题。

来源

2014-02-14 BlackMB

您可以使用QObject::blockSignals停止递归：

ui->ghy->blockSignals(true); 
ui->ghy->setValue(year); 
ui->ghy->blockSignals(false); 
// and similarly for other spinboxes

来源

2014-02-14 20:59:12

它的工作原理，请你解释一下这个代码一点？ – BlackMB

当您在不阻塞信号的情况下调用'setValue'时，Qt调用一个信号并递归调用连接的插槽。如果'setValue'被同一个槽调用，它会导致无限递归。当你调用'blockSignals（true）'时，对象停止发送信号，'setValue'不会导致连接的调用槽。 'blockSignals（false）'呼叫重新启用发送信号。 –

插槽和信号无限循环

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