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Poodletooth-iLand/panda/python/Lib/site-packages/wx/lib/agw/knobctrl.py
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# --------------------------------------------------------------------------------- #
# KNOBCTRL wxPython IMPLEMENTATION
#
# Andrea Gavana, @ 03 Nov 2006
# Latest Revision: 27 Dec 2012, 21.00 GMT
#
#
# TODO List
#
# 1. Any idea?
#
# For All Kind Of Problems, Requests Of Enhancements And Bug Reports, Please
# Write To Me At:
#
# andrea.gavana@maerskoil.com
# andrea.gavana@gmail.com
#
# Or, Obviously, To The wxPython Mailing List!!!
#
# Tags: phoenix-port, unittest, documented, py3-port
#
# End Of Comments
# --------------------------------------------------------------------------------- #
"""
:class:`KnobCtrl` lets the user select a numerical value by rotating it.
Description
===========
:class:`KnobCtrl` lets the user select a numerical value by rotating it. It works like a
scrollbar: just set the ticks range property and read the value property in the
associated ``EVT_KC_ANGLE_CHANGING``/``EVT_KC_ANGLE_CHANGED`` events. Simple but
effective.
It can be easily used if you want to simulate the volume knob of a music player
or similar functionalities.
Usage
=====
Usage example::
import wx
import wx.lib.agw.knobctrl as KC
class MyFrame(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, -1, "KnobCtrl Demo")
panel = wx.Panel(self)
knob1 = KC.KnobCtrl(panel, -1, size=(100, 100))
knob2 = KC.KnobCtrl(panel, -1, size=(100, 100))
knob1.SetTags(range(0, 151, 10))
knob1.SetAngularRange(-45, 225)
knob1.SetValue(45)
knob2.SetTags(range(0, 151, 10))
knob2.SetAngularRange(0, 270)
knob2.SetValue(100)
main_sizer = wx.BoxSizer(wx.VERTICAL)
main_sizer.Add(knob1, 0, wx.EXPAND | wx.ALL, 20)
main_sizer.Add(knob2, 0, wx.EXPAND | wx.ALL, 20)
panel.SetSizer(main_sizer)
main_sizer.Layout()
# our normal wxApp-derived class, as usual
app = wx.App(0)
frame = MyFrame(None)
app.SetTopWindow(frame)
frame.Show()
app.MainLoop()
Events
======
:class:`KnobCtrl` implements two events that can be intercepted by the user:
- ``EVT_KC_ANGLE_CHANGING``;
- ``EVT_KC_ANGLE_CHANGED``.
The first one can be "vetoed" by eliminating the `event.Skip()` at the end of the
event handler.
Supported Platforms
===================
:class:`KnobCtrl` has been tested on the following platforms:
* Windows (Windows XP);
* Linux Ubuntu (Dapper 6.06)
Window Styles
=============
This class supports the following window styles:
================== =========== ==================================================
Window Styles Hex Value Description
================== =========== ==================================================
``KC_BUFFERED_DC`` 0x1 Flag to use double buffering (recommendeded = 1).
================== =========== ==================================================
Events Processing
=================
This class processes the following events:
========================= ==================================================
Event Name Description
========================= ==================================================
``EVT_KC_ANGLE_CHANGED`` Notify the client that the knob has changed its value.
``EVT_KC_ANGLE_CHANGING`` Notify the client that the knob is changing its value.
========================= ==================================================
License And Version
===================
:class:`KnobCtrl` is distributed under the wxPython license.
Latest Revision: Andrea Gavana @ 27 Dec 2012, 21.00 GMT
Version 0.4
"""
__docformat__ = "epytext"
import wx
import math
# Flag to use double buffering (recommendeded = 1)
KC_BUFFERED_DC = 1
"""Flag to use double buffering (recommendeded = 1)"""
# Events
wxEVT_KC_ANGLE_CHANGING = wx.NewEventType()
wxEVT_KC_ANGLE_CHANGED = wx.NewEventType()
EVT_KC_ANGLE_CHANGING = wx.PyEventBinder(wxEVT_KC_ANGLE_CHANGING, 1)
""" Notify the client that the knob is changing its value."""
EVT_KC_ANGLE_CHANGED = wx.PyEventBinder(wxEVT_KC_ANGLE_CHANGED, 1)
""" Notify the client that the knob has changed its value."""
# ---------------------------------------------------------------------------- #
# Class KnobCtrlEvent
# ---------------------------------------------------------------------------- #
class KnobCtrlEvent(wx.CommandEvent):
"""
Represent details of the events that the :class:`KnobCtrl` object sends.
"""
def __init__(self, eventType, eventId=1):
"""
Default class constructor.
For internal use: do not call it in your code!
:param `eventType`: the event type;
:param `eventId`: the event identifier.
"""
wx.CommandEvent.__init__(self, eventType, eventId)
def SetOldValue(self, oldValue):
"""
Sets the old :class:`KnobCtrl` value for this event.
:param `oldValue`: an integer representing the old value.
"""
self._oldValue = oldValue
def GetOldValue(self):
""" Returns the old :class:`KnobCtrl` value for this event. """
return self._oldValue
def SetValue(self, value):
"""
Sets the new :class:`KnobCtrl` value for this event.
:param `value`: an integer representing the new value.
"""
self._value = value
def GetValue(self):
""" Returns the new :class:`KnobCtrl` value for this event. """
return self._value
#----------------------------------------------------------------------
# BUFFERENDWINDOW Class
# This Class Has Been Taken From The wxPython Wiki, And Slightly
# Adapted To Fill My Needs. See:
#
# http://wiki.wxpython.org/index.cgi/DoubleBufferedDrawing
#
# For More Info About DC And Double Buffered Drawing.
#----------------------------------------------------------------------
class BufferedWindow(wx.Window):
"""
A Buffered window class.
To use it, subclass it and define a `Draw(dc)` method that takes a `dc`
to draw to. In that method, put the code needed to draw the picture
you want. The window will automatically be double buffered, and the
screen will be automatically updated when a Paint event is received.
When the drawing needs to change, you app needs to call the
:meth:`BufferedWindow.UpdateDrawing() <BufferedWindow.UpdateDrawing>` method. Since the drawing is stored in a bitmap, you
can also save the drawing to file by calling the
`SaveToFile(self, file_name, file_type)` method.
"""
def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition, size=wx.DefaultSize,
style=wx.NO_FULL_REPAINT_ON_RESIZE, agwStyle=KC_BUFFERED_DC):
"""
Default class constructor.
:param `parent`: parent window. Must not be ``None``;
:param `id`: window identifier. A value of -1 indicates a default value;
:param `pos`: the control position. A value of (-1, -1) indicates a default position,
chosen by either the windowing system or wxPython, depending on platform;
:param `size`: the control size. A value of (-1, -1) indicates a default size,
chosen by either the windowing system or wxPython, depending on platform;
:param `style`: the window style;
:param `agwStyle`: if set to ``KC_BUFFERED_DC``, double-buffering will
be used.
"""
wx.Window.__init__(self, parent, id, pos, size, style)
self.Bind(wx.EVT_PAINT, self.OnPaint)
self.Bind(wx.EVT_SIZE, self.OnSize)
self.Bind(wx.EVT_ERASE_BACKGROUND, lambda x: None)
# OnSize called to make sure the buffer is initialized.
# This might result in OnSize getting called twice on some
# platforms at initialization, but little harm done.
self.OnSize(None)
def Draw(self, dc):
"""
This method should be overridden when sub-classed.
:param `dc`: an instance of :class:`DC`.
"""
pass
def OnPaint(self, event):
"""
Handles the ``wx.EVT_PAINT`` event for :class:`BufferedWindow`.
:param `event`: a :class:`PaintEvent` event to be processed.
"""
# All that is needed here is to draw the buffer to screen
if self._agwStyle == KC_BUFFERED_DC:
dc = wx.BufferedPaintDC(self, self._Buffer)
else:
dc = wx.PaintDC(self)
dc.DrawBitmap(self._Buffer,0,0)
def OnSize(self,event):
"""
Handles the ``wx.EVT_SIZE`` event for :class:`BufferedWindow`.
:param `event`: a :class:`SizeEvent` event to be processed.
"""
# The Buffer init is done here, to make sure the buffer is always
# the same size as the Window
self.Width, self.Height = self.GetClientSize()
# Make new off screen bitmap: this bitmap will always have the
# current drawing in it, so it can be used to save the image to
# a file, or whatever.
# This seems required on MacOS, it doesn't like wx.Bitmap with
# size = (0, 0)
# Thanks to Gerard Grazzini
if "__WXMAC__" in wx.Platform:
if self.Width == 0:
self.Width = 1
if self.Height == 0:
self.Height = 1
self._Buffer = wx.Bitmap(self.Width, self.Height)
memory = wx.MemoryDC()
memory.SelectObject(self._Buffer)
memory.SetBackground(wx.Brush(self.GetBackgroundColour()))
memory.SetPen(wx.TRANSPARENT_PEN)
memory.Clear()
minradius = min(0.9*self.Width/2.0, 0.9*self.Height/2.0)
memory.DrawCircle(self.Width//2, self.Height//2, minradius)
memory.SelectObject(wx.NullBitmap)
self._region = wx.Region(self._Buffer, self.GetBackgroundColour())
self._minradius = minradius
self.UpdateDrawing()
def UpdateDrawing(self):
"""
This would get called if the drawing needed to change, for whatever reason.
The idea here is that the drawing is based on some data generated
elsewhere in the system. If that data changes, the drawing needs to
be updated.
"""
if self._agwStyle == KC_BUFFERED_DC:
dc = wx.BufferedDC(wx.ClientDC(self), self._Buffer)
self.Draw(dc)
else:
# update the buffer
dc = wx.MemoryDC()
dc.SelectObject(self._Buffer)
self.Draw(dc)
# update the screen
wx.ClientDC(self).Blit(0, 0, self.Width, self.Height, dc, 0, 0)
# ---------------------------------------------------------------------------- #
# Class KnobCtrl
# ---------------------------------------------------------------------------- #
class KnobCtrl(BufferedWindow):
"""
This class can be used to simulate a knob volume control often found in
PC music players.
"""
def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition,
size=wx.DefaultSize,
agwStyle=KC_BUFFERED_DC):
"""
Default class constructor.
:param `parent`: parent window. Must not be ``None``;
:param `id`: window identifier. A value of -1 indicates a default value;
:param `pos`: the control position. A value of (-1, -1) indicates a default position,
chosen by either the windowing system or wxPython, depending on platform;
:param `size`: the control size. A value of (-1, -1) indicates a default size,
chosen by either the windowing system or wxPython, depending on platform;
:param `style`: the window style;
:param `agwStyle`: if set to ``KC_BUFFERED_DC``, double-buffering will
be used.
"""
self._agwStyle = agwStyle
self._knobcolour = wx.SystemSettings.GetColour(wx.SYS_COLOUR_3DFACE)
self._startcolour = wx.WHITE
self._endcolour = wx.Colour(170, 170, 150)
self._tagscolour = wx.BLACK
self._boundingcolour = wx.WHITE
self._tags = []
self._anglestart = -45
self._angleend = 180
self._state = 0
self._minvalue = 0
self._maxvalue = 100
self._old_ang = 0
self._trackposition = 0
self._knobradius = 4
BufferedWindow.__init__(self, parent, id, pos, size,
style=wx.NO_FULL_REPAINT_ON_RESIZE,
agwStyle=agwStyle)
self.Bind(wx.EVT_MOUSE_EVENTS, self.OnMouseEvents)
self.SetValue(self._trackposition)
def OnMouseEvents(self, event):
"""
Handles the ``wx.EVT_MOUSE_EVENTS`` event for :class:`KnobCtrl`.
:param `event`: a :class:`MouseEvent` event to be processed.
"""
if self._state == 0 and event.Entering():
self._state = 1
elif self._state >= 1 and event.Leaving():
self._state = 0
elif self._state == 1 and event.LeftDown():
self._state = 2
self._mousePosition = event.GetPosition()
self.SetTrackPosition()
elif self._state == 2 and event.LeftIsDown():
self._mousePosition = event.GetPosition()
self.SetTrackPosition()
elif self._state == 2 and event.LeftUp():
self._state = 1
def SetTags(self, tags):
"""
Sets the tags for :class:`KnobCtrl`.
:param `tags`: a list of integers ranging from `minvalue` to `maxvalue`.
"""
self._tags = tags
if min(tags) < self._minvalue:
self._minvalue = min(tags)
if max(tags) > self._maxvalue:
self._maxvalue = max(tags)
self.OnSize(None)
def GetMinValue(self):
""" Returns the minimum value for :class:`KnobCtrl`. """
return self._minvalue
def GetMaxValue(self):
""" Returns the maximum value for :class:`KnobCtrl`. """
return self._maxvalue
def GetKnobRadius(self):
""" Returns the knob radius, in pixels. """
return self._knobradius
def SetKnobRadius(self, radius):
"""
Sets the knob radius.
:param `radius`: the knob radius, in pixels.
"""
if radius <= 0:
return
self._knobradius = radius
self.UpdateDrawing()
def GetTags(self):
""" Returns the :class:`KnobCtrl` tags. """
return self._tags
def SetTagsColour(self, colour):
"""
Sets the tags colour.
:param `colour`: a valid :class:`Colour` object.
"""
self._tagscolour = colour
self.UpdateDrawing()
def GetTagsColour(self):
""" Returns the tags colour. """
return self._tagscolour
def SetBoundingColour(self, colour):
"""
Sets the bounding circle colour.
:param `colour`: a valid :class:`Colour` object.
"""
self._boundingcolour = colour
self.UpdateDrawing()
def GetBoundingColour(self):
""" Returns the bounding circle colour. """
return self._boundingcolour
def SetFirstGradientColour(self, colour):
"""
Sets the first gradient colour for shading.
:param `colour`: a valid :class:`Colour` object.
"""
self._startcolour = colour
self.UpdateDrawing()
def GetFirstGradientColour(self):
""" Returns the first gradient colour for shading. """
return self._startcolour
def SetSecondGradientColour(self, colour):
"""
Sets the second gradient colour for shading.
:param `colour`: a valid :class:`Colour` object.
"""
self._endcolour = colour
self.UpdateDrawing()
def GetSecondGradientColour(self):
""" Returns the second gradient colour for shading. """
return self._endcolour
def SetAngularRange(self, start, end):
"""
Sets the angular range for :class:`KnobCtrl`.
:param `start`: the starting angle, in degrees, clockwise;
:param `start`: the ending angle, in degrees, clockwise.
"""
self._anglestart = start
self._angleend = end
self.UpdateDrawing()
def GetAngularRange(self):
"""
Returns the angular range for :class:`KnobCtrl` as a tuple. The `start` and `end`
angles in the returned tuple are given in degrees, clockwise.
"""
return self._anglestart, self._angleend
def Draw(self, dc):
"""
Draws everything on the empty bitmap.
Here all the chosen styles are applied.
:param `dc`: an instance of :class:`DC`.
"""
size = self.GetClientSize()
if size.x < 21 or size.y < 21:
return
dc.SetClippingRegion(self._region.GetBox())
self.DrawDiagonalGradient(dc, size)
self.DrawInsetCircle(dc, self._knobcolour)
dc.DestroyClippingRegion()
self.DrawBoundingCircle(dc, size)
if self._tags:
self.DrawTags(dc, size)
def DrawTags(self, dc, size):
"""
Draws the tags.
:param `dc`: an instance of :class:`DC`;
:param `size`: the control size.
"""
deltarange = abs(self._tags[-1] - self._tags[0])
deltaangle = self._angleend - self._anglestart
width = size.x
height = size.y
xshift = 0
yshift = 0
if width > height:
xshift = width - height
elif width < height:
yshift = height - width
coeff = float(deltaangle)/float(deltarange)
dcPen = wx.Pen(self._tagscolour, 1)
for tags in self._tags:
if tags == self._tags[0] or tags == self._tags[-1]:
# draw first and last tags bigger
dcPen.SetWidth(2)
tagLen = 8
else:
dcPen.SetWidth(1)
tagLen = 6
dc.SetPen(dcPen)
tg = tags - self._tags[0]
angle = tg*coeff + self._anglestart
angle = angle*math.pi/180.0
sxi = math.cos(angle)*(width - xshift + tagLen - 6)/2.0
syi = math.sin(angle)*(height - yshift + tagLen - 6)/2.0
dxi = math.cos(angle)*((width - xshift + tagLen - 6)/2.0 - tagLen)
dyi = math.sin(angle)*((height - yshift + tagLen - 6)/2.0 - tagLen)
dc.DrawLine(width//2 - sxi, height//2 - syi,
width//2 - dxi, height//2 - dyi)
def DrawDiagonalGradient(self, dc, size):
"""
Draw a shading of diagonal gradient to :class:`KnobCtrl`.
:param `dc`: an instance of :class:`DC`;
:param `size`: the control size.
"""
col1 = self._startcolour
col2 = self._endcolour
r1, g1, b1 = int(col1.Red()), int(col1.Green()), int(col1.Blue())
r2, g2, b2 = int(col2.Red()), int(col2.Green()), int(col2.Blue())
maxsize = max(size.x, size.y)
flrect = maxsize
rstep = float((r2 - r1)) / flrect
gstep = float((g2 - g1)) / flrect
bstep = float((b2 - b1)) / flrect
rf, gf, bf = 0, 0, 0
dc.SetBrush(wx.TRANSPARENT_BRUSH)
for ii in range(0, maxsize, 2):
currCol = (r1 + rf, g1 + gf, b1 + bf)
dc.SetPen(wx.Pen(currCol, 2))
dc.DrawLine(0, ii+2, ii+2, 0)
rf = rf + rstep
gf = gf + gstep
bf = bf + bstep
for ii in range(0, maxsize, 2):
currCol = (r1 + rf, g1 + gf, b1 + bf)
dc.SetPen(wx.Pen(currCol, 2))
dc.DrawLine(ii+2, maxsize, maxsize, ii+2)
rf = rf + rstep
gf = gf + gstep
bf = bf + bstep
def OffsetColour(self, colour, offset):
"""
Changes the input colour by the `offset` value. Used internally.
:param `colour`: a valid :class:`Colour` object;
:param `offset`: an integer value for offsetting the input colour.
"""
byRed = 0
byGreen = 0
byBlue = 0
offsetR = offset
offsetG = offset
offsetB = offset
if offset < -255 or offset> 255:
return colour
# Get RGB components of specified colour
byRed = colour.Red()
byGreen = colour.Green()
byBlue = colour.Blue()
# Calculate max. allowed real offset
if offset > 0:
if byRed + offset > 255:
offsetR = 255 - byRed
if byGreen + offset > 255:
offsetG = 255 - byGreen
if byBlue + offset > 255:
offsetB = 255 - byBlue
offset = min(min(offsetR, offsetG), offsetB)
else:
if byRed + offset < 0:
offsetR = -byRed
if byGreen + offset < 0:
offsetG = -byGreen
if byBlue + offset < 0:
offsetB = -byBlue
offset = max(max(offsetR, offsetG), offsetB)
c1 = wx.Colour(byRed + offset, byGreen + offset, byBlue + offset)
return c1
def DrawInsetCircle(self, dc, pencolour):
"""
Draws the small knob.
:param `dc`: an instance of :class:`DC`;
:param `pencolour`: the colour to use for drawing the inset circle.
"""
self._knobcenter = self.CircleCoords(self._minradius*0.8, self.GetTrackPosition(),
self.Width//2, self.Height//2)
cx, cy = self._knobcenter
r = self._knobradius
p1 = wx.Pen(self.OffsetColour(pencolour, -70), 2)
p2 = wx.Pen(self.OffsetColour(pencolour, 10), 1)
pt1 = wx.Point(cx-r*math.sqrt(2)/2.0, cy+r*math.sqrt(2)/2.0)
pt2 = wx.Point(cx+r*math.sqrt(2)/2.0, cy-r*math.sqrt(2)/2.0)
dc.SetPen(p2)
dc.DrawArc(pt1, pt2, (cx, cy))
dc.SetPen(p1)
dc.DrawArc(pt2, pt1, (cx, cy))
def DrawBoundingCircle(self, dc, size):
"""
Draws the :class:`KnobCtrl` bounding circle.
:param `dc`: an instance of :class:`DC`;
:param `size`: the control size.
"""
radius = 0.9*min(size.x, size.y)/2.0
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetPen(wx.Pen(self._boundingcolour))
dc.DrawCircle(self.Width//2, self.Height//2, radius)
def CircleCoords(self, radius, angle, centerX, centerY):
"""
Converts the input values into logical `x` and `y` coordinates.
:param `radius`: the :class:`KnobCtrl` radius;
:param `angle`: the angular position of the mouse;
:param `centerX`: the `x` position of the :class:`KnobCtrl` center;
:param `centerX`: the `y` position of the :class:`KnobCtrl` center.
"""
x = radius*math.cos(angle) + centerX
y = radius*math.sin(angle) + centerY
return x, y
def SetTrackPosition(self):
""" Used internally. """
width, height = self.GetSize()
x = self._mousePosition.x
y = self._mousePosition.y
ang = self.GetAngleFromCoord(x, y)
val = ang*180.0/math.pi
deltarange = self._maxvalue - self._minvalue
deltaangle = self._angleend - self._anglestart
coeff = float(deltaangle)/float(deltarange)
if self._anglestart < 0 and val >= 360.0 + self._anglestart:
scaledval = (val - (360.0 + self._anglestart))/coeff
else:
scaledval = (val - self._anglestart)/coeff
if scaledval > self._maxvalue or scaledval < self._minvalue:
ang = self._old_ang
else:
event = KnobCtrlEvent(wxEVT_KC_ANGLE_CHANGING, self.GetId())
event.SetEventObject(self)
event.SetOldValue(self.GetValue())
event.SetValue(int(round(scaledval)))
if self.GetEventHandler().ProcessEvent(event):
# the caller didn't use event.Skip()
return
self.SetValue(scaledval)
event.SetEventType(wxEVT_KC_ANGLE_CHANGED)
event.SetOldValue(scaledval)
self.GetEventHandler().ProcessEvent(event)
self._old_ang = ang
def SetValue(self, val):
"""
Sets programmatically the value of :class:`KnobCtrl`.
:param `val`: an integer specifying the new :class:`KnobCtrl` value.
:note: This method does not send a :class:`KnobCtrlEvent`.
"""
if val < self._minvalue or val > self._maxvalue:
return
width, height = self.GetSize()
deltarange = self._maxvalue - self._minvalue
deltaangle = self._angleend - self._anglestart
coeff = float(deltaangle)/float(deltarange)
ang = 360.0 + val*coeff + self._anglestart
ang = ang*math.pi/180.0
self._old_ang = ang
self._trackposition = int(round(val))
self.UpdateDrawing()
def GetValue(self):
""" Returns the value of :class:`KnobCtrl`. """
return self._trackposition
def GetTrackPosition(self):
""" Used internally. """
return self._old_ang - math.pi
def GetAngleFromCoord(self, cx, cy):
"""
Returns the angular position based on the input logical coordinates.
Used internally.
:param `cx`: the `x` logical position;
:param `cy`: the `y` logical position.
"""
width, height = self.GetSize()
ang = 0
y = (height/2.0 - float(cy))/(height/2.0)
x = (float(cx) - width/2.0)/(height/2.0)
ang = ang - math.atan2(-y, -x)
if ang < 0:
ang = ang + 2.0*math.pi
return ang
if __name__ == '__main__':
import wx
class MyFrame(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, -1, "KnobCtrl Demo")
panel = wx.Panel(self)
knob1 = KnobCtrl(panel, -1, size=(100, 100))
knob2 = KnobCtrl(panel, -1, size=(100, 100))
knob1.SetTags(list(range(0, 151, 10)))
knob1.SetAngularRange(-45, 225)
knob1.SetValue(45)
knob2.SetTags(list(range(0, 151, 10)))
knob2.SetAngularRange(0, 270)
knob2.SetValue(100)
main_sizer = wx.BoxSizer(wx.VERTICAL)
main_sizer.Add(knob1, 0, wx.EXPAND|wx.ALL, 20)
main_sizer.Add(knob2, 0, wx.EXPAND|wx.ALL, 20)
panel.SetSizer(main_sizer)
main_sizer.Layout()
# our normal wxApp-derived class, as usual
app = wx.App(0)
frame = MyFrame(None)
app.SetTopWindow(frame)
frame.Show()
app.MainLoop()
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