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# Natural Language Toolkit: Drawing utilities # # Copyright (C) 2001-2012 NLTK Project # Author: Edward Loper <edloper@gradient.cis.upenn.edu> # URL: <http://www.nltk.org/> # For license information, see LICENSE.TXT
Tools for graphically displaying and interacting with the objects and processing classes defined by the Toolkit. These tools are primarily intended to help students visualize the objects that they create.
The graphical tools are typically built using "canvas widgets", each of which encapsulates the graphical elements and bindings used to display a complex object on a Tkinter ``Canvas``. For example, NLTK defines canvas widgets for displaying trees and directed graphs, as well as a number of simpler widgets. These canvas widgets make it easier to build new graphical tools and demos. See the class documentation for ``CanvasWidget`` for more information.
The ``nltk.draw`` module defines the abstract ``CanvasWidget`` base class, and a number of simple canvas widgets. The remaining canvas widgets are defined by submodules, such as ``nltk.draw.tree``.
The ``nltk.draw`` module also defines ``CanvasFrame``, which encapsulates a ``Canvas`` and its scrollbars. It uses a ``ScrollWatcherWidget`` to ensure that all canvas widgets contained on its canvas are within the scroll region.
Acknowledgements: Many of the ideas behind the canvas widget system are derived from ``CLIG``, a Tk-based grapher for linguistic data structures. For more information, see the CLIG homepage (http://www.ags.uni-sb.de/~konrad/clig.html).
"""
RAISED, Scrollbar, StringVar, Text, Tk, Toplevel, Widget)
##////////////////////////////////////////////////////// ## CanvasWidget ##//////////////////////////////////////////////////////
""" A collection of graphical elements and bindings used to display a complex object on a Tkinter ``Canvas``. A canvas widget is responsible for managing the ``Canvas`` tags and callback bindings necessary to display and interact with the object. Canvas widgets are often organized into hierarchies, where parent canvas widgets control aspects of their child widgets.
Each canvas widget is bound to a single ``Canvas``. This ``Canvas`` is specified as the first argument to the ``CanvasWidget``'s constructor.
Attributes ========== Each canvas widget can support a variety of "attributes", which control how the canvas widget is displayed. Some typical examples attributes are ``color``, ``font``, and ``radius``. Each attribute has a default value. This default value can be overridden in the constructor, using keyword arguments of the form ``attribute=value``:
>>> from nltk.draw.util import CanvasText >>> cn = CanvasText(c, 'test', color='red')
Attribute values can also be changed after a canvas widget has been constructed, using the ``__setitem__`` operator:
>>> cn['font'] = 'times'
The current value of an attribute value can be queried using the ``__getitem__`` operator:
>>> cn['color'] red
For a list of the attributes supported by a type of canvas widget, see its class documentation.
Interaction =========== The attribute ``'draggable'`` controls whether the user can drag a canvas widget around the canvas. By default, canvas widgets are not draggable.
``CanvasWidget`` provides callback support for two types of user interaction: clicking and dragging. The method ``bind_click`` registers a callback function that is called whenever the canvas widget is clicked. The method ``bind_drag`` registers a callback function that is called after the canvas widget is dragged. If the user clicks or drags a canvas widget with no registered callback function, then the interaction event will propagate to its parent. For each canvas widget, only one callback function may be registered for an interaction event. Callback functions can be deregistered with the ``unbind_click`` and ``unbind_drag`` methods.
Subclassing =========== ``CanvasWidget`` is an abstract class. Subclasses are required to implement the following methods:
- ``__init__``: Builds a new canvas widget. It must perform the following three tasks (in order): - Create any new graphical elements. - Call ``_add_child_widget`` on each child widget. - Call the ``CanvasWidget`` constructor. - ``_tags``: Returns a list of the canvas tags for all graphical elements managed by this canvas widget, not including graphical elements managed by its child widgets. - ``_manage``: Arranges the child widgets of this canvas widget. This is typically only called when the canvas widget is created. - ``_update``: Update this canvas widget in response to a change in a single child.
For a ``CanvasWidget`` with no child widgets, the default definitions for ``_manage`` and ``_update`` may be used.
If a subclass defines any attributes, then it should implement ``__getitem__`` and ``__setitem__``. If either of these methods is called with an unknown attribute, then they should propagate the request to ``CanvasWidget``.
Most subclasses implement a number of additional methods that modify the ``CanvasWidget`` in some way. These methods must call ``parent.update(self)`` after making any changes to the canvas widget's graphical elements. The canvas widget must also call ``parent.update(self)`` after changing any attribute value that affects the shape or position of the canvas widget's graphical elements.
:type __canvas: Tkinter.Canvas :ivar __canvas: This ``CanvasWidget``'s canvas.
:type __parent: CanvasWidget or None :ivar __parent: This ``CanvasWidget``'s hierarchical parent widget. :type __children: list(CanvasWidget) :ivar __children: This ``CanvasWidget``'s hierarchical child widgets.
:type __updating: bool :ivar __updating: Is this canvas widget currently performing an update? If it is, then it will ignore any new update requests from child widgets.
:type __draggable: bool :ivar __draggable: Is this canvas widget draggable? :type __press: event :ivar __press: The ButtonPress event that we're currently handling. :type __drag_x: int :ivar __drag_x: Where it's been moved to (to find dx) :type __drag_y: int :ivar __drag_y: Where it's been moved to (to find dy) :type __callbacks: dictionary :ivar __callbacks: Registered callbacks. Currently, four keys are used: ``1``, ``2``, ``3``, and ``'drag'``. The values are callback functions. Each callback function takes a single argument, which is the ``CanvasWidget`` that triggered the callback. """ """ Create a new canvas widget. This constructor should only be called by subclass constructors; and it should be called only "after" the subclass has constructed all graphical canvas objects and registered all child widgets.
:param canvas: This canvas widget's canvas. :type canvas: Tkinter.Canvas :param parent: This canvas widget's hierarchical parent. :type parent: CanvasWidget :param attribs: The new canvas widget's attributes. """ if self.__class__ == CanvasWidget: raise TypeError('CanvasWidget is an abstract base class')
if not isinstance(canvas, Canvas): raise TypeError('Expected a canvas!')
self.__canvas = canvas self.__parent = parent
# If the subclass constructor called _add_child_widget, then # self.__children will already exist. if not hasattr(self, '_CanvasWidget__children'): self.__children = []
# Is this widget hidden? self.__hidden = 0
# Update control (prevents infinite loops) self.__updating = 0
# Button-press and drag callback handling. self.__press = None self.__drag_x = self.__drag_y = 0 self.__callbacks = {} self.__draggable = 0
# Set up attributes. for (attr, value) in attribs.items(): self[attr] = value
# Manage this canvas widget self._manage()
# Register any new bindings for tag in self._tags(): self.__canvas.tag_bind(tag, '<ButtonPress-1>', self.__press_cb) self.__canvas.tag_bind(tag, '<ButtonPress-2>', self.__press_cb) self.__canvas.tag_bind(tag, '<ButtonPress-3>', self.__press_cb)
##////////////////////////////////////////////////////// ## Inherited methods. ##//////////////////////////////////////////////////////
""" :return: A bounding box for this ``CanvasWidget``. The bounding box is a tuple of four coordinates, *(xmin, ymin, xmax, ymax)*, for a rectangle which encloses all of the canvas widget's graphical elements. Bounding box coordinates are specified with respect to the coordinate space of the ``Canvas``. :rtype: tuple(int, int, int, int) """ if self.__hidden: return (0,0,0,0) if len(self.tags()) == 0: raise ValueError('No tags') return self.__canvas.bbox(*self.tags())
""" :return: The width of this canvas widget's bounding box, in its ``Canvas``'s coordinate space. :rtype: int """ if len(self.tags()) == 0: raise ValueError('No tags') bbox = self.__canvas.bbox(*self.tags()) return bbox[2]-bbox[0]
""" :return: The height of this canvas widget's bounding box, in its ``Canvas``'s coordinate space. :rtype: int """ if len(self.tags()) == 0: raise ValueError('No tags') bbox = self.__canvas.bbox(*self.tags()) return bbox[3]-bbox[1]
""" :return: The hierarchical parent of this canvas widget. ``self`` is considered a subpart of its parent for purposes of user interaction. :rtype: CanvasWidget or None """ return self.__parent
""" :return: A list of the hierarchical children of this canvas widget. These children are considered part of ``self`` for purposes of user interaction. :rtype: list of CanvasWidget """ return self.__children
""" :return: The canvas that this canvas widget is bound to. :rtype: Tkinter.Canvas """ return self.__canvas
""" Move this canvas widget by a given distance. In particular, shift the canvas widget right by ``dx`` pixels, and down by ``dy`` pixels. Both ``dx`` and ``dy`` may be negative, resulting in leftward or upward movement.
:type dx: int :param dx: The number of pixels to move this canvas widget rightwards. :type dy: int :param dy: The number of pixels to move this canvas widget downwards. :rtype: None """ if dx == dy == 0: return for tag in self.tags(): self.__canvas.move(tag, dx, dy) if self.__parent: self.__parent.update(self)
""" Move this canvas widget to the given location. In particular, shift the canvas widget such that the corner or side of the bounding box specified by ``anchor`` is at location (``x``, ``y``).
:param x,y: The location that the canvas widget should be moved to. :param anchor: The corner or side of the canvas widget that should be moved to the specified location. ``'N'`` specifies the top center; ``'NE'`` specifies the top right corner; etc. """ x1,y1,x2,y2 = self.bbox() if anchor == 'NW': self.move(x-x1, y-y1) if anchor == 'N': self.move(x-x1/2-x2/2, y-y1) if anchor == 'NE': self.move(x-x2, y-y1) if anchor == 'E': self.move(x-x2, y-y1/2-y2/2) if anchor == 'SE': self.move(x-x2, y-y2) if anchor == 'S': self.move(x-x1/2-x2/2, y-y2) if anchor == 'SW': self.move(x-x1, y-y2) if anchor == 'W': self.move(x-x1, y-y1/2-y2/2)
""" Remove this ``CanvasWidget`` from its ``Canvas``. After a ``CanvasWidget`` has been destroyed, it should not be accessed.
Note that you only need to destroy a top-level ``CanvasWidget``; its child widgets will be destroyed automatically. If you destroy a non-top-level ``CanvasWidget``, then the entire top-level widget will be destroyed.
:raise ValueError: if this ``CanvasWidget`` has a parent. :rtype: None """ if self.__parent is not None: self.__parent.destroy() return
for tag in self.tags(): self.__canvas.tag_unbind(tag, '<ButtonPress-1>') self.__canvas.tag_unbind(tag, '<ButtonPress-2>') self.__canvas.tag_unbind(tag, '<ButtonPress-3>') self.__canvas.delete(*self.tags()) self.__canvas = None
""" Update the graphical display of this canvas widget, and all of its ancestors, in response to a change in one of this canvas widget's children.
:param child: The child widget that changed. :type child: CanvasWidget """ if self.__hidden or child.__hidden: return # If we're already updating, then do nothing. This prevents # infinite loops when _update modifies its children. if self.__updating: return self.__updating = 1
# Update this CanvasWidget. self._update(child)
# Propagate update request to the parent. if self.__parent: self.__parent.update(self)
# We're done updating. self.__updating = 0
""" Arrange this canvas widget and all of its descendants.
:rtype: None """ if self.__hidden: return for child in self.__children: child.manage() self._manage()
""" :return: a list of the canvas tags for all graphical elements managed by this canvas widget, including graphical elements managed by its child widgets. :rtype: list of int """ if self.__canvas is None: raise ValueError('Attempt to access a destroyed canvas widget') tags = [] tags += self._tags() for child in self.__children: tags += child.tags() return tags
""" Set the value of the attribute ``attr`` to ``value``. See the class documentation for a list of attributes supported by this canvas widget.
:rtype: None """ if attr == 'draggable': self.__draggable = value else: raise ValueError('Unknown attribute %r' % attr)
""" :return: the value of the attribute ``attr``. See the class documentation for a list of attributes supported by this canvas widget. :rtype: (any) """ if attr == 'draggable': return self.__draggable else: raise ValueError('Unknown attribute %r' % attr)
""" :return: a string representation of this canvas widget. :rtype: str """ return '<%s>' % self.__class__.__name__
""" Temporarily hide this canvas widget.
:rtype: None """ self.__hidden = 1 for tag in self.tags(): self.__canvas.itemconfig(tag, state='hidden')
""" Show a hidden canvas widget.
:rtype: None """ self.__hidden = 0 for tag in self.tags(): self.__canvas.itemconfig(tag, state='normal')
""" :return: True if this canvas widget is hidden. :rtype: bool """ return self.__hidden
##////////////////////////////////////////////////////// ## Callback interface ##//////////////////////////////////////////////////////
""" Register a new callback that will be called whenever this ``CanvasWidget`` is clicked on.
:type callback: function :param callback: The callback function that will be called whenever this ``CanvasWidget`` is clicked. This function will be called with this ``CanvasWidget`` as its argument. :type button: int :param button: Which button the user should use to click on this ``CanvasWidget``. Typically, this should be 1 (left button), 3 (right button), or 2 (middle button). """ self.__callbacks[button] = callback
""" Register a new callback that will be called after this ``CanvasWidget`` is dragged. This implicitly makes this ``CanvasWidget`` draggable.
:type callback: function :param callback: The callback function that will be called whenever this ``CanvasWidget`` is clicked. This function will be called with this ``CanvasWidget`` as its argument. """ self.__draggable = 1 self.__callbacks['drag'] = callback
""" Remove a callback that was registered with ``bind_click``.
:type button: int :param button: Which button the user should use to click on this ``CanvasWidget``. Typically, this should be 1 (left button), 3 (right button), or 2 (middle button). """ try: del self.__callbacks[button] except: pass
""" Remove a callback that was registered with ``bind_drag``. """ try: del self.__callbacks['drag'] except: pass
##////////////////////////////////////////////////////// ## Callback internals ##//////////////////////////////////////////////////////
""" Handle a button-press event: - record the button press event in ``self.__press`` - register a button-release callback. - if this CanvasWidget or any of its ancestors are draggable, then register the appropriate motion callback. """ # If we're already waiting for a button release, then ignore # this new button press. if (self.__canvas.bind('<ButtonRelease-1>') or self.__canvas.bind('<ButtonRelease-2>') or self.__canvas.bind('<ButtonRelease-3>')): return
# Unbind motion (just in case; this shouldn't be necessary) self.__canvas.unbind('<Motion>')
# Record the button press event. self.__press = event
# If any ancestor is draggable, set up a motion callback. # (Only if they pressed button number 1) if event.num == 1: widget = self while widget is not None: if widget['draggable']: widget.__start_drag(event) break widget = widget.parent()
# Set up the button release callback. self.__canvas.bind('<ButtonRelease-%d>' % event.num, self.__release_cb)
""" Begin dragging this object: - register a motion callback - record the drag coordinates """ self.__canvas.bind('<Motion>', self.__motion_cb) self.__drag_x = event.x self.__drag_y = event.y
""" Handle a motion event: - move this object to the new location - record the new drag coordinates """ self.move(event.x-self.__drag_x, event.y-self.__drag_y) self.__drag_x = event.x self.__drag_y = event.y
""" Handle a release callback: - unregister motion & button release callbacks. - decide whether they clicked, dragged, or cancelled - call the appropriate handler. """ # Unbind the button release & motion callbacks. self.__canvas.unbind('<ButtonRelease-%d>' % event.num) self.__canvas.unbind('<Motion>')
# Is it a click or a drag? if (event.time - self.__press.time < 100 and abs(event.x-self.__press.x) + abs(event.y-self.__press.y) < 5): # Move it back, if we were dragging. if self.__draggable and event.num == 1: self.move(self.__press.x - self.__drag_x, self.__press.y - self.__drag_y) self.__click(event.num) elif event.num == 1: self.__drag()
self.__press = None
""" If this ``CanvasWidget`` has a drag callback, then call it; otherwise, find the closest ancestor with a drag callback, and call it. If no ancestors have a drag callback, do nothing. """ if self.__draggable: if 'drag' in self.__callbacks: cb = self.__callbacks['drag'] try: cb(self) except: print('Error in drag callback for %r' % self) elif self.__parent is not None: self.__parent.__drag()
""" If this ``CanvasWidget`` has a drag callback, then call it; otherwise, find the closest ancestor with a click callback, and call it. If no ancestors have a click callback, do nothing. """ if button in self.__callbacks: cb = self.__callbacks[button] #try: cb(self) #except: # print 'Error in click callback for %r' % self # raise elif self.__parent is not None: self.__parent.__click(button)
##////////////////////////////////////////////////////// ## Child/parent Handling ##//////////////////////////////////////////////////////
""" Register a hierarchical child widget. The child will be considered part of this canvas widget for purposes of user interaction. ``_add_child_widget`` has two direct effects: - It sets ``child``'s parent to this canvas widget. - It adds ``child`` to the list of canvas widgets returned by the ``child_widgets`` member function.
:param child: The new child widget. ``child`` must not already have a parent. :type child: CanvasWidget """ if not hasattr(self, '_CanvasWidget__children'): self.__children = [] if child.__parent is not None: raise ValueError('%s already has a parent', child) child.__parent = self self.__children.append(child)
""" Remove a hierarchical child widget. This child will no longer be considered part of this canvas widget for purposes of user interaction. ``_add_child_widget`` has two direct effects: - It sets ``child``'s parent to None. - It removes ``child`` from the list of canvas widgets returned by the ``child_widgets`` member function.
:param child: The child widget to remove. ``child`` must be a child of this canvas widget. :type child: CanvasWidget """ self.__children.remove(child) child.__parent = None
##////////////////////////////////////////////////////// ## Defined by subclass ##//////////////////////////////////////////////////////
""" :return: a list of canvas tags for all graphical elements managed by this canvas widget, not including graphical elements managed by its child widgets. :rtype: list of int """ raise NotImplementedError()
""" Arrange the child widgets of this canvas widget. This method is called when the canvas widget is initially created. It is also called if the user calls the ``manage`` method on this canvas widget or any of its ancestors.
:rtype: None """ pass
""" Update this canvas widget in response to a change in one of its children.
:param child: The child that changed. :type child: CanvasWidget :rtype: None """ pass
##////////////////////////////////////////////////////// ## Basic widgets. ##//////////////////////////////////////////////////////
""" A canvas widget that displays a single string of text.
Attributes: - ``color``: the color of the text. - ``font``: the font used to display the text. - ``justify``: justification for multi-line texts. Valid values are ``left``, ``center``, and ``right``. - ``width``: the width of the text. If the text is wider than this width, it will be line-wrapped at whitespace. - ``draggable``: whether the text can be dragged by the user. """ """ Create a new text widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :type text: str :param text: The string of text to display. :param attribs: The new canvas widget's attributes. """ self._text = text self._tag = canvas.create_text(1, 1, text=text) CanvasWidget.__init__(self, canvas, **attribs)
if attr in ('color', 'font', 'justify', 'width'): if attr == 'color': attr = 'fill' self.canvas().itemconfig(self._tag, {attr:value}) else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'width': return int(self.canvas().itemcget(self._tag, attr)) elif attr in ('color', 'font', 'justify'): if attr == 'color': attr = 'fill' return self.canvas().itemcget(self._tag, attr) else: return CanvasWidget.__getitem__(self, attr)
""" :return: The text displayed by this text widget. :rtype: str """ return self.canvas().itemcget(self._tag, 'TEXT')
""" Change the text that is displayed by this text widget.
:type text: str :param text: The string of text to display. :rtype: None """ self.canvas().itemconfig(self._tag, text=text) if self.parent() is not None: self.parent().update(self)
return '[Text: %r]' % self._text
""" A canvas widget that displays special symbols, such as the negation sign and the exists operator. Symbols are specified by name. Currently, the following symbol names are defined: ``neg``, ``disj``, ``conj``, ``lambda``, ``merge``, ``forall``, ``exists``, ``subseteq``, ``subset``, ``notsubset``, ``emptyset``, ``imp``, ``rightarrow``, ``equal``, ``notequal``, ``epsilon``.
Attributes:
- ``color``: the color of the text. - ``draggable``: whether the text can be dragged by the user.
:cvar SYMBOLS: A dictionary mapping from symbols to the character in the ``symbol`` font used to render them. """ 'lambda': '\154', 'merge': '\304', 'forall': '\042', 'exists': '\044', 'subseteq': '\315', 'subset': '\314', 'notsubset': '\313', 'emptyset': '\306', 'imp': '\336', 'rightarrow': chr(222), #'\256', 'equal': '\75', 'notequal': '\271', 'intersection': '\307', 'union': '\310', 'epsilon': 'e', }
""" Create a new symbol widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :type symbol: str :param symbol: The name of the symbol to display. :param attribs: The new canvas widget's attributes. """ attribs['font'] = 'symbol' TextWidget.__init__(self, canvas, '', **attribs) self.set_symbol(symbol)
""" :return: the name of the symbol that is displayed by this symbol widget. :rtype: str """ return self._symbol
""" Change the symbol that is displayed by this symbol widget.
:type symbol: str :param symbol: The name of the symbol to display. """ if symbol not in SymbolWidget.SYMBOLS: raise ValueError('Unknown symbol: %s' % symbol) self._symbol = symbol self.set_text(SymbolWidget.SYMBOLS[symbol])
return '[Symbol: %r]' % self._symbol
""" Open a new Tkinter window that displays the entire alphabet for the symbol font. This is useful for constructing the ``SymbolWidget.SYMBOLS`` dictionary. """ top = Tk() def destroy(e, top=top): top.destroy() top.bind('q', destroy) Button(top, text='Quit', command=top.destroy).pack(side='bottom') text = Text(top, font=('helvetica', -size), width=20, height=30) text.pack(side='left') sb=Scrollbar(top, command=text.yview) text['yscrollcommand']=sb.set sb.pack(side='right', fill='y') text.tag_config('symbol', font=('symbol', -size)) for i in range(256): if i in (0,10): continue # null and newline for k,v in SymbolWidget.SYMBOLS.items(): if v == chr(i): text.insert('end', '%-10s\t' % k) break else: text.insert('end', '%-10d \t' % i) text.insert('end', '[%s]\n' % chr(i), 'symbol') top.mainloop()
""" An abstract class for canvas widgets that contain a single child, such as ``BoxWidget`` and ``OvalWidget``. Subclasses must define a constructor, which should create any new graphical elements and then call the ``AbstractCanvasContainer`` constructor. Subclasses must also define the ``_update`` method and the ``_tags`` method; and any subclasses that define attributes should define ``__setitem__`` and ``__getitem__``. """ """ Create a new container widget. This constructor should only be called by subclass constructors.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param child: The container's child widget. ``child`` must not have a parent. :type child: CanvasWidget :param attribs: The new canvas widget's attributes. """ self._child = child self._add_child_widget(child) CanvasWidget.__init__(self, canvas, **attribs)
self._update(self._child)
""" :return: The child widget contained by this container widget. :rtype: CanvasWidget """ return self._child
""" Change the child widget contained by this container widget.
:param child: The new child widget. ``child`` must not have a parent. :type child: CanvasWidget :rtype: None """ self._remove_child_widget(self._child) self._add_child_widget(child) self._child = child self.update(child)
name = self.__class__.__name__ if name[-6:] == 'Widget': name = name[:-6] return '[%s: %r]' % (name, self._child)
""" A canvas widget that places a box around a child widget.
Attributes: - ``fill``: The color used to fill the interior of the box. - ``outline``: The color used to draw the outline of the box. - ``width``: The width of the outline of the box. - ``margin``: The number of pixels space left between the child and the box. - ``draggable``: whether the text can be dragged by the user. """ """ Create a new box widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param child: The child widget. ``child`` must not have a parent. :type child: CanvasWidget :param attribs: The new canvas widget's attributes. """ self._child = child self._margin = 1 self._box = canvas.create_rectangle(1,1,1,1) canvas.tag_lower(self._box) AbstractContainerWidget.__init__(self, canvas, child, **attribs)
if attr == 'margin': self._margin = value elif attr in ('outline', 'fill', 'width'): self.canvas().itemconfig(self._box, {attr:value}) else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'margin': return self._margin elif attr == 'width': return float(self.canvas().itemcget(self._box, attr)) elif attr in ('outline', 'fill', 'width'): return self.canvas().itemcget(self._box, attr) else: return CanvasWidget.__getitem__(self, attr)
(x1, y1, x2, y2) = child.bbox() margin = self._margin + self['width']/2 self.canvas().coords(self._box, x1-margin, y1-margin, x2+margin, y2+margin)
""" A canvas widget that places a oval around a child widget.
Attributes: - ``fill``: The color used to fill the interior of the oval. - ``outline``: The color used to draw the outline of the oval. - ``width``: The width of the outline of the oval. - ``margin``: The number of pixels space left between the child and the oval. - ``draggable``: whether the text can be dragged by the user. - ``double``: If true, then a double-oval is drawn. """ """ Create a new oval widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param child: The child widget. ``child`` must not have a parent. :type child: CanvasWidget :param attribs: The new canvas widget's attributes. """ self._child = child self._margin = 1 self._oval = canvas.create_oval(1,1,1,1) self._circle = attribs.pop('circle', False) self._double = attribs.pop('double', False) if self._double: self._oval2 = canvas.create_oval(1,1,1,1) else: self._oval2 = None canvas.tag_lower(self._oval) AbstractContainerWidget.__init__(self, canvas, child, **attribs)
c = self.canvas() if attr == 'margin': self._margin = value elif attr == 'double': if value==True and self._oval2 is None: # Copy attributes & position from self._oval. x1, y1, x2, y2 = c.bbox(self._oval) w = self['width']*2 self._oval2 = c.create_oval(x1-w, y1-w, x2+w, y2+w, outline=c.itemcget(self._oval, 'outline'), width=c.itemcget(self._oval, 'width')) c.tag_lower(self._oval2) if value==False and self._oval2 is not None: c.delete(self._oval2) self._oval2 = None elif attr in ('outline', 'fill', 'width'): c.itemconfig(self._oval, {attr:value}) if self._oval2 is not None and attr!='fill': c.itemconfig(self._oval2, {attr:value}) if self._oval2 is not None and attr!='fill': self.canvas().itemconfig(self._oval2, {attr:value}) else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'margin': return self._margin elif attr == 'double': return self._double is not None elif attr == 'width': return float(self.canvas().itemcget(self._oval, attr)) elif attr in ('outline', 'fill', 'width'): return self.canvas().itemcget(self._oval, attr) else: return CanvasWidget.__getitem__(self, attr)
# The ratio between inscribed & circumscribed ovals
R = OvalWidget.RATIO (x1, y1, x2, y2) = child.bbox() margin = self._margin
# If we're a circle, pretend our contents are square. if self._circle: dx, dy = abs(x1-x2), abs(y1-y2) if dx > dy: y = (y1+y2)/2 y1, y2 = y-dx/2, y+dx/2 elif dy > dx: x = (x1+x2)/2 x1, x2 = x-dy/2, x+dy/2
# Find the four corners. left = int(( x1*(1+R) + x2*(1-R) ) / 2) right = left + int((x2-x1)*R) top = int(( y1*(1+R) + y2*(1-R) ) / 2) bot = top + int((y2-y1)*R) self.canvas().coords(self._oval, left-margin, top-margin, right+margin, bot+margin) if self._oval2 is not None: self.canvas().coords(self._oval2, left-margin+2, top-margin+2, right+margin-2, bot+margin-2)
if self._oval2 is None: return [self._oval] else: return [self._oval, self._oval2]
""" A canvas widget that places a pair of parenthases around a child widget.
Attributes: - ``color``: The color used to draw the parenthases. - ``width``: The width of the parenthases. - ``draggable``: whether the text can be dragged by the user. """ """ Create a new parenthasis widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param child: The child widget. ``child`` must not have a parent. :type child: CanvasWidget :param attribs: The new canvas widget's attributes. """ self._child = child self._oparen = canvas.create_arc(1,1,1,1, style='arc', start=90, extent=180) self._cparen = canvas.create_arc(1,1,1,1, style='arc', start=-90, extent=180) AbstractContainerWidget.__init__(self, canvas, child, **attribs)
if attr == 'color': self.canvas().itemconfig(self._oparen, outline=value) self.canvas().itemconfig(self._cparen, outline=value) elif attr == 'width': self.canvas().itemconfig(self._oparen, width=value) self.canvas().itemconfig(self._cparen, width=value) else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'color': return self.canvas().itemcget(self._oparen, 'outline') elif attr == 'width': return self.canvas().itemcget(self._oparen, 'width') else: return CanvasWidget.__getitem__(self, attr)
(x1, y1, x2, y2) = child.bbox() width = max((y2-y1)/6, 4) self.canvas().coords(self._oparen, x1-width, y1, x1+width, y2) self.canvas().coords(self._cparen, x2-width, y1, x2+width, y2)
""" A canvas widget that places a pair of brackets around a child widget.
Attributes: - ``color``: The color used to draw the brackets. - ``width``: The width of the brackets. - ``draggable``: whether the text can be dragged by the user. """ """ Create a new bracket widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param child: The child widget. ``child`` must not have a parent. :type child: CanvasWidget :param attribs: The new canvas widget's attributes. """ self._child = child self._obrack = canvas.create_line(1,1,1,1,1,1,1,1) self._cbrack = canvas.create_line(1,1,1,1,1,1,1,1) AbstractContainerWidget.__init__(self, canvas, child, **attribs)
if attr == 'color': self.canvas().itemconfig(self._obrack, fill=value) self.canvas().itemconfig(self._cbrack, fill=value) elif attr == 'width': self.canvas().itemconfig(self._obrack, width=value) self.canvas().itemconfig(self._cbrack, width=value) else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'color': return self.canvas().itemcget(self._obrack, 'outline') elif attr == 'width': return self.canvas().itemcget(self._obrack, 'width') else: return CanvasWidget.__getitem__(self, attr)
(x1, y1, x2, y2) = child.bbox() width = max((y2-y1)/8, 2) self.canvas().coords(self._obrack, x1, y1, x1-width, y1, x1-width, y2, x1, y2) self.canvas().coords(self._cbrack, x2, y1, x2+width, y1, x2+width, y2, x2, y2)
""" A canvas widget that keeps a list of canvas widgets in a horizontal line.
Attributes: - ``align``: The vertical alignment of the children. Possible values are ``'top'``, ``'center'``, and ``'bottom'``. By default, children are center-aligned. - ``space``: The amount of horizontal space to place between children. By default, one pixel of space is used. - ``ordered``: If true, then keep the children in their original order. """ """ Create a new sequence widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param children: The widgets that should be aligned horizontally. Each child must not have a parent. :type children: list(CanvasWidget) :param attribs: The new canvas widget's attributes. """ self._align = 'center' self._space = 1 self._ordered = False self._children = list(children) for child in children: self._add_child_widget(child) CanvasWidget.__init__(self, canvas, **attribs)
if attr == 'align': if value not in ('top', 'bottom', 'center'): raise ValueError('Bad alignment: %r' % value) self._align = value elif attr == 'space': self._space = value elif attr == 'ordered': self._ordered = value else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'align': return value elif attr == 'space': return self._space elif attr == 'ordered': return self._ordered else: return CanvasWidget.__getitem__(self, attr)
if self._align == 'top': return top if self._align == 'bottom': return bot if self._align == 'center': return (top+bot)/2
# Align all children with child. (left, top, right, bot) = child.bbox() y = self._yalign(top, bot) for c in self._children: (x1, y1, x2, y2) = c.bbox() c.move(0, y-self._yalign(y1,y2))
if self._ordered and len(self._children) > 1: index = self._children.index(child)
x = right + self._space for i in range(index+1, len(self._children)): (x1, y1, x2, y2) = self._children[i].bbox() if x > x1: self._children[i].move(x-x1, 0) x += x2-x1 + self._space
x = left - self._space for i in range(index-1, -1, -1): (x1, y1, x2, y2) = self._children[i].bbox() if x < x2: self._children[i].move(x-x2, 0) x -= x2-x1 + self._space
if len(self._children) == 0: return child = self._children[0]
# Align all children with child. (left, top, right, bot) = child.bbox() y = self._yalign(top, bot)
index = self._children.index(child)
# Line up children to the right of child. x = right + self._space for i in range(index+1, len(self._children)): (x1, y1, x2, y2) = self._children[i].bbox() self._children[i].move(x-x1, y-self._yalign(y1,y2)) x += x2-x1 + self._space
# Line up children to the left of child. x = left - self._space for i in range(index-1, -1, -1): (x1, y1, x2, y2) = self._children[i].bbox() self._children[i].move(x-x2, y-self._yalign(y1,y2)) x -= x2-x1 + self._space
return '[Sequence: ' + repr(self._children)[1:-1]+']'
# Provide an alias for the child_widgets() member.
""" Replace the child canvas widget ``oldchild`` with ``newchild``. ``newchild`` must not have a parent. ``oldchild``'s parent will be set to None.
:type oldchild: CanvasWidget :param oldchild: The child canvas widget to remove. :type newchild: CanvasWidget :param newchild: The canvas widget that should replace ``oldchild``. """ index = self._children.index(oldchild) self._children[index] = newchild self._remove_child_widget(oldchild) self._add_child_widget(newchild) self.update(newchild)
""" Remove the given child canvas widget. ``child``'s parent will be set ot None.
:type child: CanvasWidget :param child: The child canvas widget to remove. """ index = self._children.index(child) del self._children[index] self._remove_child_widget(child) if len(self._children) > 0: self.update(self._children[0])
""" Insert a child canvas widget before a given index.
:type child: CanvasWidget :param child: The canvas widget that should be inserted. :type index: int :param index: The index where the child widget should be inserted. In particular, the index of ``child`` will be ``index``; and the index of any children whose indices were greater than equal to ``index`` before ``child`` was inserted will be incremented by one. """ self._children.insert(index, child) self._add_child_widget(child)
""" A canvas widget that keeps a list of canvas widgets in a vertical line.
Attributes: - ``align``: The horizontal alignment of the children. Possible values are ``'left'``, ``'center'``, and ``'right'``. By default, children are center-aligned. - ``space``: The amount of vertical space to place between children. By default, one pixel of space is used. - ``ordered``: If true, then keep the children in their original order. """ """ Create a new stack widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :param children: The widgets that should be aligned vertically. Each child must not have a parent. :type children: list(CanvasWidget) :param attribs: The new canvas widget's attributes. """ self._align = 'center' self._space = 1 self._ordered = False self._children = list(children) for child in children: self._add_child_widget(child) CanvasWidget.__init__(self, canvas, **attribs)
if attr == 'align': if value not in ('left', 'right', 'center'): raise ValueError('Bad alignment: %r' % value) self._align = value elif attr == 'space': self._space = value elif attr == 'ordered': self._ordered = value else: CanvasWidget.__setitem__(self, attr, value)
if attr == 'align': return value elif attr == 'space': return self._space elif attr == 'ordered': return self._ordered else: return CanvasWidget.__getitem__(self, attr)
if self._align == 'left': return left if self._align == 'right': return right if self._align == 'center': return (left+right)/2
# Align all children with child. (left, top, right, bot) = child.bbox() x = self._xalign(left, right) for c in self._children: (x1, y1, x2, y2) = c.bbox() c.move(x-self._xalign(x1,x2), 0)
if self._ordered and len(self._children) > 1: index = self._children.index(child)
y = bot + self._space for i in range(index+1, len(self._children)): (x1, y1, x2, y2) = self._children[i].bbox() if y > y1: self._children[i].move(0, y-y1) y += y2-y1 + self._space
y = top - self._space for i in range(index-1, -1, -1): (x1, y1, x2, y2) = self._children[i].bbox() if y < y2: self._children[i].move(0, y-y2) y -= y2-y1 + self._space
if len(self._children) == 0: return child = self._children[0]
# Align all children with child. (left, top, right, bot) = child.bbox() x = self._xalign(left, right)
index = self._children.index(child)
# Line up children below the child. y = bot + self._space for i in range(index+1, len(self._children)): (x1, y1, x2, y2) = self._children[i].bbox() self._children[i].move(x-self._xalign(x1,x2), y-y1) y += y2-y1 + self._space
# Line up children above the child. y = top - self._space for i in range(index-1, -1, -1): (x1, y1, x2, y2) = self._children[i].bbox() self._children[i].move(x-self._xalign(x1,x2), y-y2) y -= y2-y1 + self._space
return '[Stack: ' + repr(self._children)[1:-1]+']'
# Provide an alias for the child_widgets() member.
""" Replace the child canvas widget ``oldchild`` with ``newchild``. ``newchild`` must not have a parent. ``oldchild``'s parent will be set to None.
:type oldchild: CanvasWidget :param oldchild: The child canvas widget to remove. :type newchild: CanvasWidget :param newchild: The canvas widget that should replace ``oldchild``. """ index = self._children.index(oldchild) self._children[index] = newchild self._remove_child_widget(oldchild) self._add_child_widget(newchild) self.update(newchild)
""" Remove the given child canvas widget. ``child``'s parent will be set ot None.
:type child: CanvasWidget :param child: The child canvas widget to remove. """ index = self._children.index(child) del self._children[index] self._remove_child_widget(child) if len(self._children) > 0: self.update(self._children[0])
""" Insert a child canvas widget before a given index.
:type child: CanvasWidget :param child: The canvas widget that should be inserted. :type index: int :param index: The index where the child widget should be inserted. In particular, the index of ``child`` will be ``index``; and the index of any children whose indices were greater than equal to ``index`` before ``child`` was inserted will be incremented by one. """ self._children.insert(index, child) self._add_child_widget(child)
""" A canvas widget that takes up space but does not display anything. A ``SpaceWidget`` can be used to add space between elements. Each space widget is characterized by a width and a height. If you wish to only create horizontal space, then use a height of zero; and if you wish to only create vertical space, use a width of zero. """ """ Create a new space widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :type width: int :param width: The width of the new space widget. :type height: int :param height: The height of the new space widget. :param attribs: The new canvas widget's attributes. """ # For some reason, if width > 4: width -= 4 if height > 4: height -= 4 self._tag = canvas.create_line(1, 1, width, height, fill='') CanvasWidget.__init__(self, canvas, **attribs)
# note: width() and height() are already defined by CanvasWidget. """ Change the width of this space widget.
:param width: The new width. :type width: int :rtype: None """ [x1, y1, x2, y2] = self.bbox() self.canvas().coords(self._tag, x1, y1, x1+width, y2)
""" Change the height of this space widget.
:param height: The new height. :type height: int :rtype: None """ [x1, y1, x2, y2] = self.bbox() self.canvas().coords(self._tag, x1, y1, x2, y1+height)
""" A special canvas widget that adjusts its ``Canvas``'s scrollregion to always include the bounding boxes of all of its children. The scroll-watcher widget will only increase the size of the ``Canvas``'s scrollregion; it will never decrease it. """ """ Create a new scroll-watcher widget.
:type canvas: Tkinter.Canvas :param canvas: This canvas widget's canvas. :type children: list(CanvasWidget) :param children: The canvas widgets watched by the scroll-watcher. The scroll-watcher will ensure that these canvas widgets are always contained in their canvas's scrollregion. :param attribs: The new canvas widget's attributes. """ for child in children: self._add_child_widget(child) CanvasWidget.__init__(self, canvas, **attribs)
""" Add a new canvas widget to the scroll-watcher. The scroll-watcher will ensure that the new canvas widget is always contained in its canvas's scrollregion.
:param canvaswidget: The new canvas widget. :type canvaswidget: CanvasWidget :rtype: None """ self._add_child_widget(canvaswidget) self.update(canvaswidget)
""" Remove a canvas widget from the scroll-watcher. The scroll-watcher will no longer ensure that the new canvas widget is always contained in its canvas's scrollregion.
:param canvaswidget: The canvas widget to remove. :type canvaswidget: CanvasWidget :rtype: None """ self._remove_child_widget(canvaswidget)
self._adjust_scrollregion()
""" Adjust the scrollregion of this scroll-watcher's ``Canvas`` to include the bounding boxes of all of its children. """ bbox = self.bbox() canvas = self.canvas() scrollregion = [int(n) for n in canvas['scrollregion'].split()] if len(scrollregion) != 4: return if (bbox[0] < scrollregion[0] or bbox[1] < scrollregion[1] or bbox[2] > scrollregion[2] or bbox[3] > scrollregion[3]): scrollregion = ('%d %d %d %d' % (min(bbox[0], scrollregion[0]), min(bbox[1], scrollregion[1]), max(bbox[2], scrollregion[2]), max(bbox[3], scrollregion[3]))) canvas['scrollregion'] = scrollregion
##////////////////////////////////////////////////////// ## Canvas Frame ##//////////////////////////////////////////////////////
""" A ``Tkinter`` frame containing a canvas and scrollbars. ``CanvasFrame`` uses a ``ScrollWatcherWidget`` to ensure that all of the canvas widgets contained on its canvas are within its scrollregion. In order for ``CanvasFrame`` to make these checks, all canvas widgets must be registered with ``add_widget`` when they are added to the canvas; and destroyed with ``destroy_widget`` when they are no longer needed.
If a ``CanvasFrame`` is created with no parent, then it will create its own main window, including a "Done" button and a "Print" button. """ """ Create a new ``CanvasFrame``.
:type parent: Tkinter.BaseWidget or Tkinter.Tk :param parent: The parent ``Tkinter`` widget. If no parent is specified, then ``CanvasFrame`` will create a new main window. :param kw: Keyword arguments for the new ``Canvas``. See the documentation for ``Tkinter.Canvas`` for more information. """ # If no parent was given, set up a top-level window. if parent is None: self._parent = Tk() self._parent.title('NLTK') self._parent.bind('<Control-p>', lambda e: self.print_to_file()) self._parent.bind('<Control-x>', self.destroy) self._parent.bind('<Control-q>', self.destroy) else: self._parent = parent
# Create a frame for the canvas & scrollbars self._frame = frame = Frame(self._parent) self._canvas = canvas = Canvas(frame, **kw) xscrollbar = Scrollbar(self._frame, orient='horizontal') yscrollbar = Scrollbar(self._frame, orient='vertical') xscrollbar['command'] = canvas.xview yscrollbar['command'] = canvas.yview canvas['xscrollcommand'] = xscrollbar.set canvas['yscrollcommand'] = yscrollbar.set yscrollbar.pack(fill='y', side='right') xscrollbar.pack(fill='x', side='bottom') canvas.pack(expand=1, fill='both', side='left')
# Set initial scroll region. scrollregion = '0 0 %s %s' % (canvas['width'], canvas['height']) canvas['scrollregion'] = scrollregion
self._scrollwatcher = ScrollWatcherWidget(canvas)
# If no parent was given, pack the frame, and add a menu. if parent is None: self.pack(expand=1, fill='both') self._init_menubar()
menubar = Menu(self._parent)
filemenu = Menu(menubar, tearoff=0) filemenu.add_command(label='Print to Postscript', underline=0, command=self.print_to_file, accelerator='Ctrl-p') filemenu.add_command(label='Exit', underline=1, command=self.destroy, accelerator='Ctrl-x') menubar.add_cascade(label='File', underline=0, menu=filemenu)
self._parent.config(menu=menubar)
""" Print the contents of this ``CanvasFrame`` to a postscript file. If no filename is given, then prompt the user for one.
:param filename: The name of the file to print the tree to. :type filename: str :rtype: None """ if filename is None: from tkFileDialog import asksaveasfilename ftypes = [('Postscript files', '.ps'), ('All files', '*')] filename = asksaveasfilename(filetypes=ftypes, defaultextension='.ps') if not filename: return (x0, y0, w, h) = self.scrollregion() self._canvas.postscript(file=filename, x=x0, y=y0, width=w+2, height=h+2, pagewidth=w+2, # points = 1/72 inch pageheight=h+2, # points = 1/72 inch pagex=0, pagey=0)
""" :return: The current scroll region for the canvas managed by this ``CanvasFrame``. :rtype: 4-tuple of int """ (x1, y1, x2, y2) = self._canvas['scrollregion'].split() return (int(x1), int(y1), int(x2), int(y2))
""" :return: The canvas managed by this ``CanvasFrame``. :rtype: Tkinter.Canvas """ return self._canvas
""" Register a canvas widget with this ``CanvasFrame``. The ``CanvasFrame`` will ensure that this canvas widget is always within the ``Canvas``'s scrollregion. If no coordinates are given for the canvas widget, then the ``CanvasFrame`` will attempt to find a clear area of the canvas for it.
:type canvaswidget: CanvasWidget :param canvaswidget: The new canvas widget. ``canvaswidget`` must have been created on this ``CanvasFrame``'s canvas. :type x: int :param x: The initial x coordinate for the upper left hand corner of ``canvaswidget``, in the canvas's coordinate space. :type y: int :param y: The initial y coordinate for the upper left hand corner of ``canvaswidget``, in the canvas's coordinate space. """ if x is None or y is None: (x, y) = self._find_room(canvaswidget, x, y)
# Move to (x,y) (x1,y1,x2,y2) = canvaswidget.bbox() canvaswidget.move(x-x1,y-y1)
# Register with scrollwatcher. self._scrollwatcher.add_child(canvaswidget)
""" Try to find a space for a given widget. """ (left, top, right, bot) = self.scrollregion() w = widget.width() h = widget.height()
if w >= (right-left): return (0,0) if h >= (bot-top): return (0,0)
# Move the widget out of the way, for now. (x1,y1,x2,y2) = widget.bbox() widget.move(left-x2-50, top-y2-50)
if desired_x is not None: x = desired_x for y in range(top, bot-h, (bot-top-h)/10): if not self._canvas.find_overlapping(x-5, y-5, x+w+5, y+h+5): return (x,y)
if desired_y is not None: y = desired_y for x in range(left, right-w, (right-left-w)/10): if not self._canvas.find_overlapping(x-5, y-5, x+w+5, y+h+5): return (x,y)
for y in range(top, bot-h, (bot-top-h)/10): for x in range(left, right-w, (right-left-w)/10): if not self._canvas.find_overlapping(x-5, y-5, x+w+5, y+h+5): return (x,y) return (0,0)
""" Remove a canvas widget from this ``CanvasFrame``. This deregisters the canvas widget, and destroys it. """ self.remove_widget(canvaswidget) canvaswidget.destroy()
# Deregister with scrollwatcher. self._scrollwatcher.remove_child(canvaswidget)
""" Pack this ``CanvasFrame``. See the documentation for ``Tkinter.Pack`` for more information. """ self._frame.pack(cnf, **kw) # Adjust to be big enough for kids?
""" Destroy this ``CanvasFrame``. If this ``CanvasFrame`` created a top-level window, then this will close that window. """ if self._parent is None: return self._parent.destroy() self._parent = None
""" Enter the Tkinter mainloop. This function must be called if this frame is created from a non-interactive program (e.g. from a secript); otherwise, the frame will close as soon as the script completes. """ if in_idle(): return self._parent.mainloop(*args, **kwargs)
##////////////////////////////////////////////////////// ## Text display ##//////////////////////////////////////////////////////
""" A ``Tkinter`` window used to display a text. ``ShowText`` is typically used by graphical tools to display help text, or similar information. """ **textbox_options): if width is None or height is None: (width, height) = self.find_dimentions(text, width, height)
# Create the main window. if root is None: self._top = top = Tk() else: self._top = top = Toplevel(root) top.title(title)
b = Button(top, text='Ok', command=self.destroy) b.pack(side='bottom')
tbf = Frame(top) tbf.pack(expand=1, fill='both') scrollbar = Scrollbar(tbf, orient='vertical') scrollbar.pack(side='right', fill='y') textbox = Text(tbf, wrap='word', width=width, height=height, **textbox_options) textbox.insert('end', text) textbox['state'] = 'disabled' textbox.pack(side='left', expand=1, fill='both') scrollbar['command'] = textbox.yview textbox['yscrollcommand'] = scrollbar.set
# Make it easy to close the window. top.bind('q', self.destroy) top.bind('x', self.destroy) top.bind('c', self.destroy) top.bind('<Return>', self.destroy) top.bind('<Escape>', self.destroy)
# Focus the scrollbar, so they can use up/down, etc. scrollbar.focus()
lines = text.split('\n') if width is None: maxwidth = max([len(line) for line in lines]) width = min(maxwidth, 80)
# Now, find height. height = 0 for line in lines: while len(line) > width: brk = line[:width].rfind(' ') line = line[brk:] height += 1 height += 1 height = min(height, 25)
return (width, height)
if self._top is None: return self._top.destroy() self._top = None
""" Enter the Tkinter mainloop. This function must be called if this window is created from a non-interactive program (e.g. from a secript); otherwise, the window will close as soon as the script completes. """ if in_idle(): return self._top.mainloop(*args, **kwargs)
##////////////////////////////////////////////////////// ## Entry dialog ##//////////////////////////////////////////////////////
""" A dialog box for entering """ set_callback=None, title=None): self._parent = parent self._original_text = original_text self._set_callback = set_callback
width = max(30, len(original_text)*3/2) self._top = Toplevel(parent)
if title: self._top.title(title)
# The text entry box. entryframe = Frame(self._top) entryframe.pack(expand=1, fill='both', padx=5, pady=5,ipady=10) if instructions: l=Label(entryframe, text=instructions) l.pack(side='top', anchor='w', padx=30) self._entry = Entry(entryframe, width=width) self._entry.pack(expand=1, fill='x', padx=30) self._entry.insert(0, original_text)
# A divider divider = Frame(self._top, borderwidth=1, relief='sunken') divider.pack(fill='x', ipady=1, padx=10)
# The buttons. buttons = Frame(self._top) buttons.pack(expand=0, fill='x', padx=5, pady=5) b = Button(buttons, text='Cancel', command=self._cancel, width=8) b.pack(side='right', padx=5) b = Button(buttons, text='Ok', command=self._ok, width=8, default='active') b.pack(side='left', padx=5) b = Button(buttons, text='Apply', command=self._apply, width=8) b.pack(side='left')
self._top.bind('<Return>', self._ok) self._top.bind('<Control-q>', self._cancel) self._top.bind('<Escape>', self._cancel)
self._entry.focus()
self._entry.delete(0,'end') self._entry.insert(0, self._original_text) if self._set_callback: self._set_callback(self._original_text)
try: self._reset() except: pass self._destroy()
self._apply() self._destroy()
if self._set_callback: self._set_callback(self._entry.get())
if self._top is None: return self._top.destroy() self._top = None
##////////////////////////////////////////////////////// ## Colorized List ##//////////////////////////////////////////////////////
""" An abstract base class for displaying a colorized list of items. Subclasses should define: - ``_init_colortags``, which sets up Text color tags that will be used by the list. - ``_item_repr``, which returns a list of (text,colortag) tuples that make up the colorized representation of the item. :note: Typically, you will want to register a callback for ``'select'`` that calls ``mark`` on the given item. """ """ Construct a new list.
:param parent: The Tk widget that contains the colorized list :param items: The initial contents of the colorized list. :param options: """ self._parent = parent self._callbacks = {}
# Which items are marked? self._marks = {}
# Initialize the Tkinter frames. self._init_itemframe(options.copy())
# Set up key & mouse bindings. self._textwidget.bind('<KeyPress>', self._keypress) self._textwidget.bind('<ButtonPress>', self._buttonpress)
# Fill in the given CFG's items. self._items = None self.set(items)
#//////////////////////////////////////////////////////////// # Abstract methods #////////////////////////////////////////////////////////////
""" Set up any colortags that will be used by this colorized list. E.g.: >>> textwidget.tag_config('terminal', foreground='black') """ raise NotImplementedError()
""" Return a list of (text, colortag) tuples that make up the colorized representation of the item. Colorized representations may not span multiple lines. I.e., the text strings returned may not contain newline characters. """ raise NotImplementedError()
#//////////////////////////////////////////////////////////// # Item Access #////////////////////////////////////////////////////////////
""" :return: A list of the items contained by this list. """ if index is None: return self._items[:] else: return self._items[index]
""" Modify the list of items contained by this list. """ items = list(items) if self._items == items: return self._items = list(items)
self._textwidget['state'] = 'normal' self._textwidget.delete('1.0', 'end') for item in items: for (text, colortag) in self._item_repr(item): assert '\n' not in text, 'item repr may not contain newline' self._textwidget.insert('end', text, colortag) self._textwidget.insert('end', '\n') # Remove the final newline self._textwidget.delete('end-1char', 'end') self._textwidget.mark_set('insert', '1.0') self._textwidget['state'] = 'disabled' # Clear all marks self._marks.clear()
""" Remove highlighting from the given item; or from every item, if no item is given. :raise ValueError: If ``item`` is not contained in the list. :raise KeyError: If ``item`` is not marked. """ if item is None: self._marks.clear() self._textwidget.tag_remove('highlight', '1.0', 'end+1char') else: index = self._items.index(item) del self._marks[item] (start, end) = ('%d.0' % (index+1), '%d.0' % (index+2)) self._textwidget.tag_remove('highlight', start, end)
""" Highlight the given item. :raise ValueError: If ``item`` is not contained in the list. """ self._marks[item] = 1 index = self._items.index(item) (start, end) = ('%d.0' % (index+1), '%d.0' % (index+2)) self._textwidget.tag_add('highlight', start, end)
""" Remove any current highlighting, and mark the given item. :raise ValueError: If ``item`` is not contained in the list. """ self.unmark() self.mark(item)
""" Adjust the view such that the given item is visible. If the item is already visible, then do nothing. """ index = self._items.index(item) self._textwidget.see('%d.0' % (index+1))
#//////////////////////////////////////////////////////////// # Callbacks #////////////////////////////////////////////////////////////
""" Register a callback function with the list. This function will be called whenever the given event occurs.
:param event: The event that will trigger the callback function. Valid events are: click1, click2, click3, space, return, select, up, down, next, prior, move :param func: The function that should be called when the event occurs. ``func`` will be called with a single item as its argument. (The item selected or the item moved to). """ if event == 'select': events = ['click1', 'space', 'return'] elif event == 'move': events = ['up', 'down', 'next', 'prior'] else: events = [event]
for e in events: self._callbacks.setdefault(e,{})[func] = 1
""" Deregister a callback function. If ``func`` is none, then all callbacks are removed for the given event. """ if event is None: events = self._callbacks.keys() elif event == 'select': events = ['click1', 'space', 'return'] elif event == 'move': events = ['up', 'down', 'next', 'prior'] else: events = [event]
for e in events: if func is None: del self._callbacks[e] else: try: del self._callbacks[e][func] except: pass
#//////////////////////////////////////////////////////////// # Tkinter Methods #////////////////////////////////////////////////////////////
# "@include: Tkinter.Pack.pack" self._itemframe.pack(cnf, **kw)
# "@include: Tkinter.Grid.grid" self._itemframe.grid(cnf, *kw)
# "@include: Tkinter.Widget.focus" self._textwidget.focus()
#//////////////////////////////////////////////////////////// # Internal Methods #////////////////////////////////////////////////////////////
self._itemframe = Frame(self._parent)
# Create the basic Text widget & scrollbar. options.setdefault('background', '#e0e0e0') self._textwidget = Text(self._itemframe, **options) self._textscroll = Scrollbar(self._itemframe, takefocus=0, orient='vertical') self._textwidget.config(yscrollcommand = self._textscroll.set) self._textscroll.config(command=self._textwidget.yview) self._textscroll.pack(side='right', fill='y') self._textwidget.pack(expand=1, fill='both', side='left')
# Initialize the colorization tags self._textwidget.tag_config('highlight', background='#e0ffff', border='1', relief='raised') self._init_colortags(self._textwidget, options)
# How do I want to mark keyboard selection? self._textwidget.tag_config('sel', foreground='') self._textwidget.tag_config('sel', foreground='', background='', border='', underline=1) self._textwidget.tag_lower('highlight', 'sel')
if event not in self._callbacks: return if 0 <= itemnum < len(self._items): item = self._items[itemnum] else: item = None for cb_func in self._callbacks[event].keys(): cb_func(item)
clickloc = '@%d,%d' % (event.x,event.y) insert_point = self._textwidget.index(clickloc) itemnum = int(insert_point.split('.')[0])-1 self._fire_callback('click%d' % event.num, itemnum)
if event.keysym == 'Return' or event.keysym == 'space': insert_point = self._textwidget.index('insert') itemnum = int(insert_point.split('.')[0])-1 self._fire_callback(event.keysym.lower(), itemnum) return elif event.keysym == 'Down': delta='+1line' elif event.keysym == 'Up': delta='-1line' elif event.keysym == 'Next': delta='+10lines' elif event.keysym == 'Prior': delta='-10lines' else: return 'continue'
self._textwidget.mark_set('insert', 'insert'+delta) self._textwidget.see('insert') self._textwidget.tag_remove('sel', '1.0', 'end+1char') self._textwidget.tag_add('sel', 'insert linestart', 'insert lineend')
insert_point = self._textwidget.index('insert') itemnum = int(insert_point.split('.')[0])-1 self._fire_callback(event.keysym.lower(), itemnum)
return 'break'
##////////////////////////////////////////////////////// ## Improved OptionMenu ##//////////////////////////////////////////////////////
self._callback = options.get('command') if 'command' in options: del options['command']
# Create a variable self._variable = variable = StringVar() if len(values) > 0: variable.set(values[0])
kw = {"borderwidth": 2, "textvariable": variable, "indicatoron": 1, "relief": RAISED, "anchor": "c", "highlightthickness": 2} kw.update(options) Widget.__init__(self, master, "menubutton", kw) self.widgetName = 'tk_optionMenu' self._menu = Menu(self, name="menu", tearoff=0,) self.menuname = self._menu._w
self._values = [] for value in values: self.add(value)
self["menu"] = self._menu
if value in self._values: return def set(value=value): self.set(value) self._menu.add_command(label=value, command=set) self._values.append(value)
self._variable.set(value) if self._callback: self._callback(value)
# Might raise indexerror: pass to parent. i = self._values.index(value) del self._values[i] self._menu.delete(i, i)
if name == 'menu': return self.__menu return Widget.__getitem__(self, name)
"""Destroy this widget and the associated menu.""" Menubutton.destroy(self) self._menu = None
##////////////////////////////////////////////////////// ## Test code. ##//////////////////////////////////////////////////////
""" A simple demonstration showing how to use canvas widgets. """ def fill(cw): from random import randint cw['fill'] = '#00%04d' % randint(0,9999) def color(cw): from random import randint cw['color'] = '#ff%04d' % randint(0,9999)
cf = CanvasFrame(closeenough=10, width=300, height=300) c = cf.canvas() ct3 = TextWidget(c, 'hiya there', draggable=1) ct2 = TextWidget(c, 'o o\n||\n___\n U', draggable=1, justify='center') co = OvalWidget(c, ct2, outline='red') ct = TextWidget(c, 'o o\n||\n\\___/', draggable=1, justify='center') cp = ParenWidget(c, ct, color='red') cb = BoxWidget(c, cp, fill='cyan', draggable=1, width=3, margin=10) equation = SequenceWidget(c, SymbolWidget(c, 'forall'), TextWidget(c, 'x'), SymbolWidget(c, 'exists'), TextWidget(c, 'y: '), TextWidget(c, 'x'), SymbolWidget(c, 'notequal'), TextWidget(c, 'y')) space = SpaceWidget(c, 0, 30) cstack = StackWidget(c, cb, ct3, space, co, equation, align='center') foo = TextWidget(c, 'try clicking\nand dragging', draggable=1, justify='center') cs = SequenceWidget(c, cstack, foo) zz = BracketWidget(c, cs, color='green4', width=3) cf.add_widget(zz, 60, 30)
cb.bind_click(fill) ct.bind_click(color) co.bind_click(fill) ct2.bind_click(color) ct3.bind_click(color)
cf.mainloop() #ShowText(None, 'title', ((('this is text'*150)+'\n')*5))
demo()
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