nltk_lite.draw.ScrollWatcherWidget

Package nltk_lite :: Package draw :: Class ScrollWatcherWidget

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Type ScrollWatcherWidget

  object --+    
           |    
CanvasWidget --+
               |
              ScrollWatcherWidget

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.

Method Summary
	`__init__(self, canvas, children, *attribs)` Create a new scroll-watcher widget.
`None`	`add_child(self, canvaswidget)` Add a new canvas widget to the scroll-watcher.
`None`	`remove_child(self, canvaswidget)` Remove a canvas widget from the scroll-watcher.
	`_adjust_scrollregion(self)` Adjust the scrollregion of this scroll-watcher's `Canvas` to include the bounding boxes of all of its children.
`list` of `int`	`_tags(self)` Return a list of canvas tags for all graphical elements managed by this canvas widget, not including graphical elements managed by its child widgets.
`None`	`_update(self, child)` Update this canvas widget in response to a change in one of its children.
Inherited from `CanvasWidget`: `__getitem__`, `__repr__`, `__setitem__`, `bbox`, `bind_click`, `bind_drag`, `canvas`, `child_widgets`, `destroy`, `height`, `hidden`, `hide`, `manage`, `move`, `moveto`, `parent`, `show`, `tags`, `unbind_click`, `unbind_drag`, `update`, `width`, `_add_child_widget`, `_manage`, `_remove_child_widget` Inherited from `object`: `__delattr__`, `__getattribute__`, `__hash__`, `__new__`, `__reduce__`, `__reduce_ex__`, `__setattr__`, `__str__`

Instance Variable Summary
Inherited from `CanvasWidget`: `__callbacks`, `__canvas`, `__children`, `__drag_x`, `__drag_y`, `__draggable`, `__parent`, `__press`, `__updating`

Method Details

init(self, canvas, *children, **attribs)
(Constructor)

Create a new scroll-watcher widget.

Parameters:: canvas - This canvas widget's canvas.
(type=Tkinter.Canvas); 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.
(type=list of CanvasWidget); attribs - The new canvas widget's attributes.

Overrides:: nltk_lite.draw.CanvasWidget.__init__

add_child(self, canvaswidget)

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.

Parameters:: canvaswidget - The new canvas widget.
(type=CanvasWidget)

Returns:: None

remove_child(self, 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.

Parameters:: canvaswidget - The canvas widget to remove.
(type=CanvasWidget)

Returns:: None

_adjust_scrollregion(self)

Adjust the scrollregion of this scroll-watcher's Canvas to include the bounding boxes of all of its children.

_tags(self)

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

Overrides:: nltk_lite.draw.CanvasWidget._tags (inherited documentation)

_update(self, child)

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

Parameters:: child - The child that changed.
(type=CanvasWidget)

Returns:: None

Overrides:: nltk_lite.draw.CanvasWidget._update (inherited documentation)

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