nltk.draw.util.SequenceWidget

class documentation

class SequenceWidget(CanvasWidget): (source)

Constructor: SequenceWidget(canvas, *children, **attribs)

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.

Method	`__getitem__`	No summary
Method	`__init__`	Create a new sequence widget.
Method	`__repr__`	No summary
Method	`__setitem__`	Set the value of the attribute `attr` to `value`. See the class documentation for a list of attributes supported by this canvas widget.
Method	`insert_child`	Insert a child canvas widget before a given index.
Method	`remove_child`	Remove the given child canvas widget. `child`'s parent will be set ot None.
Method	`replace_child`	Replace the child canvas widget `oldchild` with `newchild`. `newchild` must not have a parent. `oldchild`'s parent will be set to None.
Method	`_manage`	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.
Method	`_tags`	No summary
Method	`_update`	Update this canvas widget in response to a change in one of its children.
Method	`_yalign`	Undocumented
Instance Variable	`_align`	Undocumented
Instance Variable	`_children`	Undocumented
Instance Variable	`_ordered`	Undocumented
Instance Variable	`_space`	Undocumented

Inherited from CanvasWidget:

Method	`bbox`	No summary
Method	`bind_click`	Register a new callback that will be called whenever this `CanvasWidget` is clicked on.
Method	`bind_drag`	Register a new callback that will be called after this `CanvasWidget` is dragged. This implicitly makes this `CanvasWidget` draggable.
Method	`canvas`	No summary
Method	`child_widgets`	No summary
Method	`destroy`	Remove this `CanvasWidget` from its `Canvas`. After a `CanvasWidget` has been destroyed, it should not be accessed.
Method	`height`	No summary
Method	`hidden`	No summary
Method	`hide`	Temporarily hide this canvas widget.
Method	`manage`	Arrange this canvas widget and all of its descendants.
Method	`move`	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.
Method	`moveto`	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`).
Method	`parent`	No summary
Method	`show`	Show a hidden canvas widget.
Method	`tags`	No summary
Method	`unbind_click`	Remove a callback that was registered with `bind_click`.
Method	`unbind_drag`	Remove a callback that was registered with `bind_drag`.
Method	`update`	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.
Method	`width`	No summary
Method	`__click`	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.
Method	`__drag`	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.
Method	`__motion_cb`	move this object to the new location
Method	`__press_cb`	record the button press event in `self.__press`
Method	`__release_cb`	unregister motion & button release callbacks.
Method	`__start_drag`	register a motion callback
Method	`_add_child_widget`	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:
Method	`_remove_child_widget`	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:
Instance Variable	`__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.
Instance Variable	`__canvas`	This `CanvasWidget`'s canvas.
Instance Variable	`__children`	This `CanvasWidget`'s hierarchical child widgets.
Instance Variable	`__drag_x`	Where it's been moved to (to find dx)
Instance Variable	`__drag_y`	Where it's been moved to (to find dy)
Instance Variable	`__draggable`	Is this canvas widget draggable?
Instance Variable	`__hidden`	Undocumented
Instance Variable	`__parent`	This `CanvasWidget`'s hierarchical parent widget.
Instance Variable	`__press`	The ButtonPress event that we're currently handling.
Instance Variable	`__updating`	Is this canvas widget currently performing an update? If it is, then it will ignore any new update requests from child widgets.

def __getitem__(self, attr): (source) ¶

overrides nltk.draw.util.CanvasWidget.__getitem__

Returns
(any)	the value of the attribute `attr`. See the class documentation for a list of attributes supported by this canvas widget.

def __init__(self, canvas, *children, **attribs): (source) ¶

overrides nltk.draw.util.CanvasWidget.__init__

Create a new sequence widget.

Parameters
canvas:Tkinter.Canvas	This canvas widget's canvas.
*children:list(CanvasWidget)	The widgets that should be aligned horizontally. Each child must not have a parent.
**attribs	The new canvas widget's attributes.

def __repr__(self): (source) ¶

overrides nltk.draw.util.CanvasWidget.__repr__

Returns
str	a string representation of this canvas widget.

def __setitem__(self, attr, value): (source) ¶

overrides nltk.draw.util.CanvasWidget.__setitem__

Set the value of the attribute attr to value. See the class documentation for a list of attributes supported by this canvas widget.

Returns
None	Undocumented

def insert_child(self, index, child): (source) ¶

Insert a child canvas widget before a given index.

Parameters
index:int	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.
child:CanvasWidget	The canvas widget that should be inserted.

def remove_child(self, child): (source) ¶

Remove the given child canvas widget. child's parent will be set ot None.

Parameters
child:CanvasWidget	The child canvas widget to remove.

def replace_child(self, oldchild, newchild): (source) ¶

Replace the child canvas widget oldchild with newchild. newchild must not have a parent. oldchild's parent will be set to None.

Parameters
oldchild:CanvasWidget	The child canvas widget to remove.
newchild:CanvasWidget	The canvas widget that should replace `oldchild`.

def _manage(self): (source) ¶

overrides nltk.draw.util.CanvasWidget._manage

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.

Returns
None	Undocumented

def _tags(self): (source) ¶

overrides nltk.draw.util.CanvasWidget._tags

Returns
list of int	a list of canvas tags for all graphical elements managed by this canvas widget, not including graphical elements managed by its child widgets.

def _update(self, child): (source) ¶

overrides nltk.draw.util.CanvasWidget._update

Update this canvas widget in response to a change in one of its children.

Parameters
child:CanvasWidget	The child that changed.
Returns
None	Undocumented

def _yalign(self, top, bot): (source) ¶

Undocumented

_align = (source) ¶

Undocumented

_children = (source) ¶

Undocumented

_ordered: bool = (source) ¶

Undocumented

_space: int = (source) ¶

Undocumented