QSignalMapper如何工作？ [英] How does QSignalMapper work?

问题描述

在我的帖子之后：关联信号并动态创建一个qcheckbox 我需要关联：

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

•信号 clicked（）当我点击 qCheckBox 到函数 cliqueCheckBox（QTableWidget * monTab，int ligne，QCheckBox * pCheckBox）

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

要这样做，我必须使用 QSignalMapper ，经过两个小时的尝试来了解其工作原理后，我可以t效果很好，这是我编写的代码，这显然是错误的：

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)));

您能跟我解释一下 QSignalMapper 有用吗？我不太了解要与什么关联：(

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

推荐答案

QSignalMapper 类收集一组无参数的信号，并使用与发送该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出它们。因此，您可以像这样：

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 *)));

对于每个按钮，您都可以连接 clicked（） 信号到 QSignalMapper 的 map（）插槽，并使用setMapping添加映射，以便当从按钮发出 clicked（）信号时，发出 mapped（QWidget *）信号：

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);

这样，每当您单击按钮时，都会发出映射器的 mapped（QWidget *）信号，其中包含窗口小部件作为参数。

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

这篇关于QSignalMapper如何工作？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！