nltk.draw.util.CanvasFrame

class documentation

class CanvasFrame(object): (source)

Constructor: CanvasFrame(parent, **kw)

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.

Method	`__init__`	Create a new `CanvasFrame`.
Method	`add_widget`	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 ...
Method	`canvas`	No summary
Method	`destroy`	Destroy this `CanvasFrame`. If this `CanvasFrame` created a top-level window, then this will close that window.
Method	`destroy_widget`	Remove a canvas widget from this `CanvasFrame`. This deregisters the canvas widget, and destroys it.
Method	`mainloop`	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.
Method	`pack`	Pack this `CanvasFrame`. See the documentation for `Tkinter.Pack` for more information.
Method	`print_to_file`	Print the contents of this `CanvasFrame` to a postscript file. If no filename is given, then prompt the user for one.
Method	`remove_widget`	Undocumented
Method	`scrollregion`	No summary
Method	`_find_room`	Try to find a space for a given widget.
Method	`_init_menubar`	Undocumented
Instance Variable	`_canvas`	Undocumented
Instance Variable	`_frame`	Undocumented
Instance Variable	`_parent`	Undocumented
Instance Variable	`_scrollwatcher`	Undocumented

def __init__(self, parent=None, **kw): (source) ¶

Create a new CanvasFrame.

Parameters
parent:Tkinter.BaseWidget or Tkinter.Tk	The parent `Tkinter` widget. If no parent is specified, then `CanvasFrame` will create a new main window.
**kw	Keyword arguments for the new `Canvas`. See the documentation for `Tkinter.Canvas` for more information.

def add_widget(self, canvaswidget, x=None, y=None): (source) ¶

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.

Parameters
canvaswidget:CanvasWidget	The new canvas widget. `canvaswidget` must have been created on this `CanvasFrame`'s canvas.
x:int	The initial x coordinate for the upper left hand corner of `canvaswidget`, in the canvas's coordinate space.
y:int	The initial y coordinate for the upper left hand corner of `canvaswidget`, in the canvas's coordinate space.

def canvas(self): (source) ¶

Returns
Tkinter.Canvas	The canvas managed by this `CanvasFrame`.

def destroy(self, *e): (source) ¶

Destroy this CanvasFrame. If this CanvasFrame created a top-level window, then this will close that window.

def destroy_widget(self, canvaswidget): (source) ¶

Remove a canvas widget from this CanvasFrame. This deregisters the canvas widget, and destroys it.

def mainloop(self, *args, **kwargs): (source) ¶

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.

def pack(self, cnf={}, **kw): (source) ¶

Pack this CanvasFrame. See the documentation for Tkinter.Pack for more information.

def print_to_file(self, filename=None): (source) ¶

Print the contents of this CanvasFrame to a postscript file. If no filename is given, then prompt the user for one.

Parameters
filename:str	The name of the file to print the tree to.
Returns
None	Undocumented

def remove_widget(self, canvaswidget): (source) ¶

Undocumented

def scrollregion(self): (source) ¶

Returns
4-tuple of int	The current scroll region for the canvas managed by this `CanvasFrame`.

def _find_room(self, widget, desired_x, desired_y): (source) ¶

Try to find a space for a given widget.

def _init_menubar(self): (source) ¶

Undocumented

_canvas = (source) ¶

Undocumented

_frame = (source) ¶

Undocumented

_parent = (source) ¶

Undocumented

_scrollwatcher = (source) ¶

Undocumented