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components.py
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components.py
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import tkinter as tk
from drawable import Drawable, Connectable, Draggable, Connector, Arrowhead
class Frame(Draggable):
"""Represents a Frame in the environment diagram. A Frame is a Draggable
GUI element.
At a high level, a Frame consists of:
- A list of bindings mapping from Variables to Values
- A StaticLink to the enclosing environment Frame (None if it's
global)
"""
prefix = "frame"
def __init__(self, canvas, x, y, globe=False, extended_frame=None):
Draggable.__init__(self, canvas)
self.bindings = [] # List of bindings from variables to values
self.rect = canvas.create_rectangle(x, y, x + self.width, y +
self.height, tag=self.tag,
fill="white")
canvas.create_oval(x+135, y-15, x+165, y+15, tag=self.tag,
fill="white")
if globe:
pass #Shouldn't we still draw a globe?
else:
canvas.create_oval(x+145, y-5, x+155, y+5, tag=self.tag,
fill="black")
if extended_frame is not None:
self.extend(extended_frame)
else:
self.static_link = None
def extend(self, frame):
"""Extend the given Frame."""
self.static_link = StaticLink(self.canvas, self, frame)
self.update()
@property
def enclosing_frame(self):
"""The frame that encloses this frame (what is pointed to by the static
link).
"""
return self.static_link.frame
@property
def pos(self):
return tuple(self.canvas.coords(self.rect)[0:2])
def add_binding(self, variable, value):
"""Adds a Binding to this Frame.
TODO: Figure out what to do if there's a pre-existing binding for that
variable...
"""
# If there's already a binding, update it rather than add a new one.
for binding in self.bindings:
if binding.variable.name == variable:
return self.update_binding(variable, value)
variable = Variable(self.canvas, self, variable)
binding = Binding(self.canvas, variable, value)
self.bindings.append(binding)
x, y = self.pos
variable.set_pos(x + 10, y + len(self.bindings) * 20)
if value.moves_with_binding:
value.set_pos(x + 140, y + len(self.bindings) * 20)
self.update()
def update_binding(self, variable, value):
"""Updates a pre-existing Binding in this or some enclosing Frame."""
old_value = self.lookup(variable).value
if old_value is None:
raise BaseException(
"Tried to update a variable that's not in scope!")
var_x, var_y = self.lookup(variable).variable.pos
self.lookup(variable).value = value
if old_value.moves_with_binding:
old_value.set_pos(0, 0) # Or better yet, somehow remove it
if value.moves_with_binding:
value.set_pos(var_x + 130, var_y)
self.update()
def move(self, dx, dy):
Draggable.move(self, dx, dy)
for binding in self.bindings:
binding.move(dx, dy)
def update(self):
x, y = self.pos
self.canvas.coords(self.rect, x, y, x + self.width, y + self.height)
def lookup(self, variable):
"""Get the binding associated with this variable."""
for binding in self.bindings:
if binding.variable.name == variable:
return binding
if self.static_link is not None:
return self.enclosing_frame.lookup(variable)
return None
@property
def inhandle(self):
x, y = self.pos
leftside = tuple(((x, y + 20 * (i+1)) for i in
range(len(self.bindings)+1)))
rightside = tuple(((x + self.width, y + 20 * (i+1)) for i in
range(len(self.bindings)+1)))
topside = (x+40, y), (x+110, y)
downside = tuple(((x, y+self.height) for x, y in topside))
return leftside + rightside + topside + downside
@property
def outhandle(self):
x, y = self.pos
return x + self.width, y
@property
def width(self):
return 150
@property
def height(self):
return 40 + 20 * len(self.bindings)
class StaticLink(Connector):
"""Represents a StaticLink pointing to some Frame."""
def __init__(self, canvas, base, frame):
"""Renamed arguments and changed order to be easier to use."""
Connector.__init__(self, canvas, frame, base)
@property
def frame(self):
"""The frame pointed to by a StaticLink is the head."""
return self.head
@property
def base(self):
"""The base of a StaticLink is the tail."""
return self.tail
class Variable(Connectable):
prefix = "variable"
def __init__(self, canvas, frame, name):
Connectable.__init__(self, canvas)
x, y = 0, 0 # This should be set when it's bound in a Frame
self.text = canvas.create_text(x, y, anchor=tk.NW, text=name+":",
tag=self.tag)
self.name = name
def move(self, dx, dy):
self.canvas.move(self.tag, dx, dy)
#self.update_connectors() # This should be done by the Binding
def set_pos(self, x, y):
self.canvas.move(self.tag, x - self.pos[0], y - self.pos[1])
self.update_connectors()
@property
def pos(self):
return tuple(self.canvas.coords(self.text)[0:2])
@property
def width(self):
x1, _, x2, _ = self.canvas.bbox(self.text)
return ((x2 - x1)//10)*10
@property
def height(self):
_, y1, _, y2 = self.canvas.bbox(self.text)
return ((y2 - y1)//10)*10
@property
def outhandle(self):
x, y = self.pos
return round(x + self.width, -1), round(y + self.height // 2, -1)
class Value(Connectable):
prefix = "value"
moves_with_binding = True
def __init__(self, canvas, frame, name):
Connectable.__init__(self, canvas)
x, y = 0, 0 # Should be updated using set_pos
self.text = canvas.create_text(x, y, anchor=tk.NE, text=name,
tag=self.tag)
def move(self, dx, dy):
self.canvas.move(self.tag, dx, dy)
self.update_connectors()
def set_pos(self, x, y):
self.canvas.move(self.tag, x - self.pos[0], y - self.pos[1])
self.update_connectors()
@property
def pos(self):
return tuple(self.canvas.coords(self.text)[0:2])
@property
def width(self):
x1, _, x2, _ = self.canvas.bbox(self.text)
return x2 - x1
@property
def height(self):
_, y1, _, y2 = self.canvas.bbox(self.text)
return y2 - y1
@property
def inhandle(self):
x, y = self.pos
return (round(x - self.width, -1), round(y + self.height // 2, -1)),
class Binding(Connector):
"""Represents a Binding between a Variable and a Value. It is a connector
which can be moved, resulting in the Variable being moved and the Value
only being moved if Variable.moves_with_binding is True.
"""
prefix = "binding"
def __init__(self, canvas, variable, value):
"""Literally the same constructor, just preferred to give better names
to the arguments and reorder them.
"""
Connector.__init__(self, canvas, value, variable)
@property
def variable(self):
"""The variable is at the tail of the Binding Connector."""
return self.tail
@property
def value(self):
"""The value is at the tail of the Binding Connector."""
return self.head
@value.setter
def value(self, new_val):
"""The value is at the tail of the Binding Connector."""
# TODO: This is a hack, we should have the head/tail be properties with
# appropriate setter methods in Connector.
self.head = new_val
self.head.add_connector(self)
self.update()
def move(self, dx, dy):
"""Move the Binding. Moves the variable by the given amounts. If
value.moves_with_binding is True, it is also moved by the given
amounts. Updates the Connector after the movement has been done.
"""
self.variable.move(dx, dy)
if self.value.moves_with_binding:
self.value.move(dx, dy)
self.update()
class Function(Value, Draggable):
"""Represents a Function Value. A Function is a Value which does not
translate with the Binding.
At a high level, a Function consists of:
- A StaticLink
- A name
- Argument names
- A body (or a summary of the body)
"""
prefix = "function"
moves_with_binding = False
def __init__(self, canvas, x, y, name, arguments, defining_frame,
body="..."):
Draggable.__init__(self, canvas)
self.shape = canvas.create_polygon(x, y, x+140, y, x+140, y+30,
x+150, y+30, x+150, y+60, x+10, y+60, x+10, y+30, x, y+30,
tag=self.tag, fill="white", outline="white")
self.static_link = StaticLink(canvas, self, defining_frame)
canvas.create_line(x, y, x+140, y, x+140, y+30, x+150, y+30,
tag=self.tag)
canvas.create_line(x, y+30, x+10, y+30, x+10, y+60, x+150, y+60,
tag=self.tag)
canvas.create_oval(x+125, y-15, x+155, y+15, tag=self.tag, fill="white")
canvas.create_oval(x+135, y-5, x+145, y+5, tag=self.tag, fill="black")
self.name = canvas.create_text(x, y+5, tag=self.tag, anchor=tk.NW,
text=name+"("+", ".join(arguments)+"):")
self.body = canvas.create_text(x+15, y+35, tag=self.tag, anchor=tk.NW,
text=body)
@property
def pos(self):
return tuple(self.canvas.coords(self.shape)[0:2])
@property
def inhandle(self):
x, y = self.pos
return (x, y+10), (x+150, y+50)
@property
def outhandle(self):
x, y = self.pos
return x+140, y