c++ - 如何创建一个行为类似于消息框的 Qt 窗口？

Question

我想创建一个 Qt 弹出窗口，它的行为类似于 Qt 中的消息框。这意味着 GUI 的其余部分必须被阻止，直到该弹出窗口被关闭。这可能是一个 child 问题，但任何人都可以帮我解决这个问题吗？

谢谢...:)

编辑:

我想在该弹出窗口中使用表单、标签、按钮和其他一些小部件类型。

Answer 1

Modal Dialogs

A modal dialog is a dialog that blocks input to other visible windows in the same application. Users must finish interacting with the dialog and close it before they can access any other window in the application. Dialogs that are used to request a file name from the user or that are used to set application preferences are usually modal.

The most common way to display a modal dialog is to call its exec() function. When the user closes the dialog, exec() will provide a useful return value. Typically, to get the dialog to close and return the appropriate value, we connect a default button, e.g. "OK", to the accept() slot and a "Cancel" button to the reject() slot. Alternatively you can call the done() slot with Accepted or Rejected.

An alternative is to call setModal(true) or setWindowModality(), then show(). Unlike exec(), show() returns control to the caller immediately. Calling setModal(true) is especially useful for progress dialogs, where the user must have the ability to interact with the dialog, e.g. to cancel a long running operation. If you use show() and setModal(true) together to perform a long operation, you must call QApplication::processEvents() periodically during processing to enable the user to interact with the dialog. (See QProgressDialog.)