Qt：动态小部件信号和插槽连接 [英] Qt: dynamic widgets signal and slot connection

问题描述

在我的Qt应用程序中，我动态地创建了一些小部件。其中包括需要具有类似行为的QToolButton。

以下是创建小部件的方式：

  QMap< QString，QToolButton *> unselectButtonMap; 
 foreach（QString instance，...）{
 unselectButtonMap [instance] = new QToolButton; 
 myLayout-> addWidget（unselectButtonMap [instance]）; 
 QObject :: connect（unselectButtonMap [instance]，SIGNAL（clicked（）），这个，SLOT（unselectInstance（）））; 
} 
  

现在我想要 unselectInstence slot来了解哪个实例。

我首先介绍将实例名称作为参数添加到插槽，但插槽只能从信号中获取参数。这个想法是这样的：

  QObject :: connect（unselectButtonMap [instance]，SIGNAL（clicked（）），this，SLOT （unselectInstance（实例）））; 
  

有什么其他想法怎么做？

注意：根据 shan 的回答，我正在使用Qt4.8

编辑：并且因为我需要实例名称而不是QToolButton本身，这里是我来到

  void MyWindow :: unselectInstance（ ）{
 foreach（QString instance，unselectButtonMap.keys（））{
 if（unselectButtonMap [instance] == QObject :: sender（））{
 // do stuff here ... 
} 
} 
} 
  

指针比较似乎工作

RE-EDIT：，根据 user1313312 的回答，我们将声明一个QSignalMapper：

  QSignalMapper * signalMapper = new QSignalMapper（this）; 
 QObject :: connect（signalMapper，SIGNAL（mapped（QString）），这个，SLOT（unselectInstance（QString）））; 
  

然后将QToolButton连接到映射器

  signalMapper-> setMapping（unselectButtonMap [instance]，instance）; 
 QObject :: connect（unselectButtonMap [instance]，SIGNAL（clicked（）），signalMapper，SLOT（map（）））; 
  

，这个插槽会简单得多：

  void MyWindow :: unselectinstance（QString instance）{
 // do stuff here ... 
} 
  

解决方案

尽管使用 QObject :: sender（）完美的，理想主义的方法将是 QSignalMapper

In my Qt app, I create some of my widgets dynamically. Among them are QToolButtons that need to have a similar behavior.

Here is how the widgets are created:

QMap<QString, QToolButton*> unselectButtonMap;
foreach(QString instance, ...) {
  unselectButtonMap[instance] = new QToolButton;
  myLayout->addWidget(unselectButtonMap[instance]);
  QObject::connect(unselectButtonMap[instance],SIGNAL(clicked()),this,SLOT(unselectInstance()));
}

Now I would like the unselectInstence slot to know which instance is concerned.

I first thougth about giving the instance name as a parameter to the slot, but slots only take parameters from signals. The idea was something like:

QObject::connect(unselectButtonMap[instance],SIGNAL(clicked()),this,SLOT(unselectInstance(instance)));

Any other idea on how to do that ?

Notes: I'm using Qt4.8

EDIT: based on shan's answer, and because I needed the instance name instead of the QToolButton itself, here is what I came up to

void MyWindow::unselectInstance() {
  foreach(QString instance, unselectButtonMap.keys()) {
    if(unselectButtonMap[instance] == QObject::sender()) {
      //do stuff here...
    }
  }
}

The pointer comparison seems to work pretty well.

RE-EDIT: and based on user1313312's answer, we would declare a QSignalMapper:

QSignalMapper *signalMapper = new QSignalMapper(this);
QObject::connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(unselectInstance(QString)));

then connect the QToolButton to the mapper

signalMapper->setMapping(unselectButtonMap[instance], instance);
QObject::connect(unselectButtonMap[instance],SIGNAL(clicked()),signalMapper,SLOT(map()));

and the slot would be way much simpler:

void MyWindow::unselectinstance(QString instance) {
  //do stuff here...
}

解决方案

Although using QObject::sender() is perfectly fine, the idealistic approach would be QSignalMapper

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