main.py

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.popup import Popup
from kivy.uix.label import Label
from kivy.uix.behaviors import DragBehavior

class DragLabel( DragBehavior, Label ):
	pass
		
class DragPopup( DragBehavior, Popup ):
class DragPopup( DragBehavior, Popup ):
	def on_touch_move(self, touch):
		if self._get_uid('svavoid') in touch.ud or self._drag_touch is not touch:
			return super(DragBehavior, self).on_touch_move(touch) or self._get_uid() in touch.ud
		if touch.grab_current is not self:
			return True

		uid = self._get_uid()
		ud = touch.ud[uid]
		mode = ud['mode']
		if mode == 'unknown':
			ud['dx'] += abs(touch.dx)
			ud['dy'] += abs(touch.dy)
			if ud['dx'] > sp(self.drag_distance):
				mode = 'drag'
			if ud['dy'] > sp(self.drag_distance):
				mode = 'drag'
			ud['mode'] = mode
		if mode == 'drag':
			self.x += touch.dx
			self.y += touch.dy
			self.pos_hint = { 'x': ( self.x + touch.dx ) / Window.width,
					  'y': ( self.y + touch.dy ) / Window.height }
		return True

class EditBoreholeScreen( Screen ):
	def __init__( self, **kwargs ):
		super( EditBoreholeScreen, self ).__init__( **kwargs )

	def open_popup( self ):
		popup = DragPopup( title = "Testing",
				   content = Label( text = "Drag me" ),
				   size_hint = ( None, None ),
				   pos = ( 200, 200 ),
				   size = ( 600, 400 ) )
		popup.open( )

class TestApp( App ):
	def build( self ):
		sm = ScreenManager( )
		self.sm = sm
		sm.add_widget( EditBoreholeScreen( name = "edit" ) )

		return sm

if __name__ == '__main__':
	root = TestApp( )
	root.run( )

testapp.kv

#:kivy 1.10

<DragLabel>:
	drag_rectangle: self.x, self.y, self.width, self.height
	drag_timeout: 1000000
	drag_distance: 0

<DragPopup>:
	drag_rectangle: self.x, self.y+self._container.height, self.width, self.height - self._container.height
	drag_timeout: 10000000
	drag_distance: 0

<EditBoreholeScreen>:
	FloatLayout:
		canvas.before:
			Color:
				rgba: ( 1, 0, 0, 1 )
			Rectangle:
				pos: self.pos
				size: self.size

		Button:
			size_hint: None, None
			text: "Open Popup"
			pos: 100, 100
			size: 200, 100
			on_release: root.open_popup( )
		DragLabel:
			size_hint: None, None
			text: "Testing"
			pos: 400, 150
			size: 100, 50