windows 如何将输入焦点设置为 Qt 中显示的对话框？
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How to set input focus to a shown dialog in Qt?
提问by Jake Petroules
In a button click slot, I create and exec()a dialog with a NULL parent. Inside the dialog's constructor, I have:
在按钮单击槽中，我创建exec()了一个带有 NULL 父级的对话框。在对话框的构造函数中，我有：
this->activateWindow();
this->raise();
this->setFocus();
The dialog is application modal and has strong focus. However, it does NOT respond to keyboard events until I click on it. How do I make the dialog get focus without having to click it?
该对话框是应用程序模式的并且具有很强的焦点。但是，在我单击它之前，它不会响应键盘事件。如何使对话框获得焦点而无需单击它？
采纳答案by Jake Petroules
The problem was that I was setting the Qt:Tool window flag. Using Qt::Popup or Qt::Window instead will cause input focus is automatically set when the dialog is shown.
问题是我正在设置 Qt:Tool 窗口标志。使用 Qt::Popup 或 Qt::Window 将导致在显示对话框时自动设置输入焦点。
I used Qt::Window myself. Some of the other flags will probably work as well, but the main thing is that a QDialog with the Qt::Tool flag will notautomatically set input focus when the dialog is shown.
我自己使用 Qt::Window。其他一些标志可能也能工作，但主要是带有 Qt::Tool 标志的 QDialog在对话框显示时不会自动设置输入焦点。
回答by Uga Buga
In my case even settings Qt::Window didn't do the trick. I had to
就我而言，即使设置 Qt::Window 也无法解决问题。我不得不
QMetaObject::invokeMethod(widgetToFocus, "setFocus", Qt::QueuedConnection);
before show()or exec().
之前show()或exec()。
回答by Naruto
Install the Event filter for the dialog.
为对话框安装事件过滤器。
classObject->installEventFilter(this);
void className::keyPressEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_Space)
{
focusNextChild();
}
else
{
QLineEdit::keyPressEvent(event);
}
}
for more info refer here. http://doc.trolltech.com/4.6/eventsandfilters.html
有关更多信息，请参阅此处。 http://doc.trolltech.com/4.6/eventsandfilters.html
