QListWidget发送doubleClicked信号没有项目 [英] QListWidget send doubleClicked signal with no items

问题描述

我有一个QListWidget对话框，我想做一些事情（例如，打开一个QFileDialog窗口），当用户双击QListWidget。不幸的是， void doubleClicked（const QModelIndex& index）仅在列表中有项目时触发。

是否有可能获得小部件触发信号，每当收到双击事件，小部件中的任何地方？

-dynamic / www / qobject.html＃installEventFilterrel =nofollow>在listwidget的视口小部件中安装事件过滤器，类似如下：

  listWidget-> viewport（） - > installEventFilter（this）; //this可以是你的窗口对象。 
 

在eventFilter方法中检查 QEvent :: MouseButtonDblClick event：

  bool YourWindowClass :: eventFilter（QObject * obj，QEvent * event）
 {
 if（event-> type（）== QEvent :: MouseButtonDblClick）
 {
 QMouseEvent * mouseEvent = static_cast< QMouseEvent *>（event）; 
 qDebug（Mouse double click％d％d，mouseEvent-> x（），mouseEvent-> y（））; 
 return true; 
} 
 else 
 {
 return QMainWindow :: eventFilter（obj，event）; 
} 
} 
  

我希望这会有帮助。

I have a QListWidget on a dialog that I want to do something (for example, open a QFileDialog window) when a user double-clicks on the QListWidget. Unfortunately, the void doubleClicked (const QModelIndex & index) only fires when there are items in the list.

Is it possible to get the widget to fire the signal whenever a double-click event is received, anywhere within the widget? Or is a different approach required?

解决方案

You can install an event filter to the listwidget's viewport widget, something like this:

listWidget->viewport()->installEventFilter(this); // "this" could be your window object.

In the eventFilter method check for the QEvent::MouseButtonDblClick event:

bool YourWindowClass::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::MouseButtonDblClick)
    {
         QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
         qDebug("Mouse double click %d %d", mouseEvent->x(), mouseEvent->y());
         return true;
    }
    else
    {
         return QMainWindow::eventFilter(obj, event);
    }
}

I hope this helps.

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