PyQt QWidget modal dialog box is provided

Unlike QWidget QDialog, there exec_ () method to directly set a modal dialog box, but may be provided by the following method:

  setWindowModality(Qt.ApplicationModal)

Detailed code is as follows:

        wgt_tmp=QWidget()
        wgt_tmp.setWindowModality(Qt.ApplicationModal)
        wgt_tmp.setMinimumWidth(700)
        wgt_tmp.setMinimumSize(QSize(700,700))
        wgt_tmp.setStyleSheet("background-color: red;")
        wgt_tmp.show()

But the strange thing is that flash across the window, and there was no modal stop, puzzled, and finally the next day wash, inspiration, suddenly want to understand, wgt_tmp is a temporary variable after method execution, It wgt_tmp has been destroyed, so the display is fleeting, detailed look at my other article, there will be described in detail, the wgt_tmp become successful after self.wgt_tmp modal window is displayed. This place thing to note is that if it is QDialog (), conducted by exec_, can block the program, but by wgt_tmp.show () does not block the program, it will be destroyed, but it did make modal dialog box (this place is somewhat similar to the multi-threaded, multi-threading is not, it did not demonstrate).

Reference Code:

        wgt_tmp=QDialog()
        wgt_tmp.setWindowModality(Qt.ApplicationModal)
        wgt_tmp.setMinimumWidth(700)
        wgt_tmp.setMinimumSize(QSize(700,700))
        wgt_tmp.setStyleSheet("background-color: red;")
        wgt_tmp.exec_()

In fact, the design by qt designer ui auto-generated py file, there are setWindowModality (Qt.ApplicationModal) sentence, when the Internet to find for a long time, the original answer is at hand!

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