title: Properly Positioning Popup Widgets in PyQt
body: <p>his has plagued me for eons, mostly due to how many combinations of methodologies there are for moving widgets and whatnot. Essentially I have a simple widget that I'd like to be able to pop up in specific areas of my app. Problem is I can never seem to get it to pop up where I want it. Additionally, I'd like to set it up in a way where I can adjust the "pointer" side of it based on whether it's popping up to point at a widget in the top-left of the app versus, say, the bottom-right.</p>
  
  <p>Ideally, I'd be able to place the popup nearly adjacent to the edges of the parent widget, and anchor it based on where it is. Here's what I've been trying.</p>
  
  <pre><code>from PyQt4.QtCore import *
  from PyQt4.QtGui import *
  import sys
  
  class popup(QWidget):
      def __init__(self, parent = None, widget=None):    
          QWidget.__init__(self, parent)
          layout = QGridLayout(self)
          button = QPushButton("Very Interesting Text Popup. Here's an arrow   ^")
          layout.addWidget(button)
          self.move(widget.rect().bottomLeft())
  
  class Window(QWidget):
      def __init__(self):
          QWidget.__init__(self)
          self.button = QPushButton('Hit this button to show a popup', self)
          self.button.clicked.connect(self.handleOpenDialog)
          self.button.move(250, 50)
          self.resize(600, 200)
  
      def handleOpenDialog(self):
          self.popup = popup(self, self.button)
          self.popup.show()
  
  if __name__ == '__main__':
      app = QApplication(sys.argv)
      win = Window()
      win.show()
      sys.exit(app.exec_())
  </code></pre>
  
  <p>This code generates a button that's randomly in the middle of the widget. What I'm trying to get is, in this example, the popup to show under the button with its "pivot" in the top right such that the arrow in the popup button would be pointing to the bottom right corner of the widget. However it's popping up in the top left of the Window instead. In all of my messing around with .move, .setGeometry, and playing with QRect, I can't for the life of me figure this out. Huge kudos to whoever can lend a hand. Thanks!</p>