QGIS plugin closing all open PyQt dialogs

Question

In my QGIS3 plugin I need to close all open PyQt5 dialogs. The structure of my plugin is like the following code. To be clear, when I call runCloseDialogs() I want to close both dialogs opened by run() and run2() if they are open. How can I do this?

def run(self):  
  self.dlg = Dialog()       
  self.dlg.show()

def run2(self):
  self.dlg2 = Dialog2()
  self.dlg2.show()

def runCloseDialogs(self):
  #close all open dialogs here

Answer 1

CASE 1: If dialogs are created in the main class defined in main module of the plugin,

• First, find all attributes of main class. (vars(self))
• Then, check if any is QDialog and is visible. If it is, hide using setVisible(False)

def runCloseDialogs(self):

    items = vars(self)

    for i in items:
        item = items[i]
        if isinstance(item, QDialog) and item.isVisible(): 
            item.setVisible(False)

CASE 2: If the plugin has any widget (GUI) which contians other Qt elements (for example QPushButton) and dialog window is opened by that element, in this case, dialog window is (probably) child of main widget (GUI). In this case, self stands for GUI.

• First, find all QDialogs instances of the plugin.
• Then, check if it is visible. If it is, hide using setVisible(False)

def runCloseDialogs(self):

    for dlg in self.findChildren(QDialog):
        if dlg.isVisible(): 
            dlg.setVisible(False)

The script above close all dialogs defined in the plugin's GUI.

CASE 3: If you want to close only self.dlg and self.dlg2, you can use the following lines:

def runCloseDialogs(self):

    if self.dlg.isVisible():
        self.dlg.setVisible(False)

    if self.dlg2.isVisible():
        self.dlg2.setVisible(False)