QDialog::exec() blocks the application

Question

I currently have a formA that requests input from a user using another form that inherits from QDialog. The form is prompted using QDialog::exec. Now the problem is that there are going to be multiple instances of formA thus whenever any of formA opens up another form as a dialog the entire application blocks.Currently I have something like this

if(formUserInputRequired->exec()==1) //Block until the user selects from a form
{
}

Is there a way to make QDialog::exec not block the entire application I just want it to block only the instance of the form it was called on or something like that but definitely not the entire application?

Update: I do not need a blocking window. However I would like for a way to know when the user is done with the input in another form so that the original form can process that data

Answer 1

Call the setWindowModality method on the dialog with Qt::WindowModal as the argument.

Qt::NonModal          0  The window is not modal and does not block input to other windows.
Qt::WindowModal       1  The window is modal to a single window hierarchy and blocks input to its parent window, all grandparent windows, and all siblings of its parent and grandparent windows.
Qt::ApplicationModal  2  The window is modal to the application and blocks input to all windows.

Source

Answer 2

将对话框的模态设置为Qt::WindowModal （QDialog的默认值为Qt::ApplicationModal ）

Answer 3

You can use show() instead, and then to grab dialog result you connect the signal of accept to a slot of your formA to treat it, just like:

connect(formUserInputRequired, SIGNAL(accept()), this, SLOT(acceptClicked());
formUserInputRequired->show();

Answer 4

你可以使用show()方法而不是exec() ，因为exec方法有它自己的事件循环。