QSignalMapper如何工作？

问题描述

我的帖子后：我需要关联：

•信号 clicked（）当我点击 qCheckBox 到我的函数 cliqueCheckBox（QTableWidget * monTab，int ligne，QCheckBox * pCheckBox）为了这样做，我必须使用 QSignalMapper ，经过两个小时的努力来了解它是如何工作，我可以'我有一个很好的结果，这里是我所做的代码，这显然是错误的：

  QSignalMapper * m_sigmapper = new QSignalMapper ; 
 QObject :: connect（pCheckBox，SIGNAL（mapped（QTableWidget *，int，QCheckBox *）），pCheckBox，SIGNAL（clicked 
 QObject :: connect（this，SIGNAL（clicked（）），this，SLOT（cliqueCheckBox（QTableWidget * monTab，int ligne，QCheckBox * pCheckBox）））; 
 
 m_sigmapper-> setMapping（pCheckBox，（monTab，ligne，pCheckBox））; 
 QObject :: connect（m_sigmapper，SIGNAL（clicked（）），this，SLOT（cliqueCheckBox（QTableWidget * monTab，int ligne，QCheckBox * pCheckBox）））;你可以向我解释一下，如何 QSignalMapper   

$ b

解决方案

QSignalMapper 类收集一组无参数信号，并使用与发送信号的对象相对应的整数，字符串或窗口小部件参数重新发射它们。因此，您可以有一个：

  QSignalMapper * mapper = new QSignalMapper（this）; 
 QObject :: connect（mapper，SIGNAL（QWidget *）），this，SLOT（mySlot ））; 
  

对于每个按钮，您可以连接 信号到 map（）插槽 QSignalMapper 并使用setMapping添加映射当从一个按钮发出 clicked（）时，发出信号映射（QWidget *）：

  QPushButton * but = new QPushButton（this）; 
 
 QObject :: connect ），mapper，SLOT（map（）））; 
 mapper-> setMapping（but，but）; 
  


b $ b

这种方式每当你点击一个按钮，映射器的映射（QWidget *）信号发射包含窗口小部件作为参数。

After my post here : Associate signal and slot to a qcheckbox create dynamically I need to associate :

• The signal clicked() when I click on a qCheckBox to my function cliqueCheckBox(QTableWidget *monTab, int ligne, QCheckBox *pCheckBox)

To do so, I have to use QSignalMapper, after two hours of trying to understand how it works, I can't have a good result, here's the code I make, this is obviously wrong :

 QSignalMapper *m_sigmapper = new QSignalMapper(this);
 QObject::connect(pCheckBox, SIGNAL(mapped(QTableWidget*,int, QCheckBox*)), pCheckBox, SIGNAL(clicked()));
 QObject::connect(this, SIGNAL(clicked()), this, SLOT(cliqueCheckBox(QTableWidget *monTab, int ligne, QCheckBox *pCheckBox)));

 m_sigmapper->setMapping(pCheckBox, (monTab,ligne, pCheckBox));
 QObject::connect(m_sigmapper, SIGNAL(clicked()),this, SLOT(cliqueCheckBox(QTableWidget *monTab, int ligne, QCheckBox *pCheckBox)));

Can you explain to me, how QSignalMapper works ? I don't really understand what to associate with :(

解决方案

QSignalMapper class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. So you can have one like:

QSignalMapper * mapper = new QSignalMapper(this);
QObject::connect(mapper,SIGNAL(mapped(QWidget *)),this,SLOT(mySlot(QWidget *)));

For each of your buttons you can connect the clicked() signal to the map() slot of QSignalMapper and add a mapping using setMapping so that when clicked() is signaled from a button, the signal mapped(QWidget *) is emitted:

QPushButton * but = new QPushButton(this);

QObject::connect(but, SIGNAL(clicked()),mapper,SLOT(map()));
mapper->setMapping(but, but);

This way whenever you click a button, the mapped(QWidget *) signal of the mapper is emitted containing the widget as a parameter.

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