Question

我需要在QDialog的不同类中打开QMainWindow，关闭QDialog后，必须断开所有信号。

我可以通过按下组合键来打开QDialog，然后当它立即打开时，会连接到button_pressed方法，该方法本身连接到self.spanSelector_press和{{1 }}

这是到目前为止的代码：

self.spanSelector_

关闭class Window(QMainWindow): #This is a matplotlib figure def __init__(self): QMainWindow.__init__(self) #A lot of stuff for the matplotlib figure def button_pressed(self): self.select_data = SelectData(self) self.select_data.show() self.cid_press = self.figure_canvas.mpl_connect('button_press_event', self.spanSelector_press) self.cid_release = self.figure_canvas.mpl_connect('button_release_event', self.spanSelector_release) def spanSelector_press(self, event): if event.button ==1: self.limite = "minimum" self.clearMarker() #This is another method to erase the previous line drawn self.marker = self.axes.axvline(Window.minimumCoords, linestyle='dashed', linewidth = 2, color = "green") self.figure_canvas.draw_idle() Window.initial_marker = self.marker self.xmin = event.xdata def spanSelector_release(self, event): pass class SelectData(QDialog): def __init__(self, parent): QDialog.__init__(self, parent, Qt.WindowStaysOnTopHint) def closeEvent(self, event): #I need to disconnect all the signals when i close the QDialog view = self.parent() view.figure_canvas.mpl_disconnect(view.cid_press) view.figure_canvas.mpl_disconnect(view.cid_release) view.deselect() event.accept()后，如何断开button_pressed方法中的所有信号？希望你能帮帮我。

Answer 1

根据matplotlib docs，您可以使用连接ID断开连接，您需要通过在Window中执行此类操作来保存：

def button_pressed(self):
    self.select_data = SelectData(self)
    self.select_data.show()
    self.cid_press = self.figure_canvas.mpl_connect('button_press_event', self.spanSelector_press)
    self.cid_release = self.figure_canvas.mpl_connect('button_release_event', self.spanSelector_release)

您的SelectData类可以通过调用Window来引用其父类（parent()），因此您可以使用它来进行断开连接。

def closeEvent(self, event):
    window = self.parent()
    window.figure_canvas.mpl_disconnect(window.cid_press)
    window.figure_canvas.mpl_disconnect(window.cid_release)
    event.accept()

我还没有测试过，但它应该非常接近。

修改：请务必将parent传递给QDialog构造函数：

class SelectData(QDialog):
    def __init__(self, parent):
        QDialog.__init__(self, parent, Qt.WindowStaysOnTopHint)

关闭QDialog并断开信号失败

1 个答案: