Package nltk :: Package draw :: Class ScrollWatcherWidget

Class 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.

Instance Methods

[hide private]

__init__(self, canvas, *children, **attribs)
Create a new scroll-watcher widget.

source code

_adjust_scrollregion(self)
Adjust the scrollregion of this scroll-watcher's Canvas to include the bounding boxes of all of its children. source code

list of int

_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.

source code

None

_update(self, child)
Update this canvas widget in response to a change in one of its children.

source code

None

add_child(self, canvaswidget)
Add a new canvas widget to the scroll-watcher.

source code

None

remove_child(self, canvaswidget)
Remove a canvas widget from the scroll-watcher.

source code

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

Inherited from CanvasWidget (private): _add_child_widget, _manage, _remove_child_widget

Inherited from object: __delattr__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __str__

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

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

source code

Create a new scroll-watcher widget.

Parameters:

canvas (Tkinter.Canvas) - This canvas widget's canvas.
children (list of CanvasWidget) - 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.
attribs - The new canvas widget's attributes.

Overrides: CanvasWidget.__init__

_tags(self)

source code

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.
Overrides: CanvasWidget._tags: (inherited documentation)

_update(self, child)

source code

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

Parameters:

child - The child that changed.

Returns: None

Overrides: CanvasWidget._update

(inherited documentation)

add_child(self, canvaswidget)

source code

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 (CanvasWidget) - The new canvas widget.

Returns: None

remove_child(self, canvaswidget)

source code

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 (CanvasWidget) - The canvas widget to remove.

Returns: None

Class ScrollWatcherWidget

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

_tags(self)

_update(self, child)

add_child(self, canvaswidget)

remove_child(self, canvaswidget)

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