Pmw.SelectionDialog

Name

Pmw.SelectionDialog() - selection dialog displaying a scrolled list

Inherits

Pmw.Dialog

Description

The selection dialog is a dialog window which displays a scrolled list which can be used to prompt the user for a value.

Options

Options for this megawidget and its base classes are described below.

activatecommand

If this is callable, it will be called whenever the megawidget is activated by a call to activate(). The default is None.

borderx

Initialisation option. The padding to the left and right of the scrolled list. The default is 10.

bordery

Initialisation option. The padding above and below the scrolled list. The default is 10.

buttonboxpos

Initialisation option. Specifies on which side of the dialog window to place the button box. Must be one of 'n', 's', 'e' or 'w'. The default is 's'.

buttons

This must be a tuple or a list and specifies the names on the buttons in the button box. The default is ('OK',).

command

Specifies a function to call whenever a button in the button box is invoked or the window is deleted by the window manager. The function is called with a single argument, which is the name of the button which was invoked, or None if the window was deleted by the window manager.

If the value of command is not callable, the default behaviour is to deactivate the window if it is active, or withdraw the window if it is not active. If it is deactivated, deactivate() is called with the button name or None as described above. The default is None.

deactivatecommand

If this is callable, it will be called whenever the megawidget is deactivated by a call to deactivate(). The default is None.

defaultbutton

Specifies the default button in the button box. If the <Return> key is hit when the dialog has focus, the default button will be invoked. If defaultbutton is None, there will be no default button and hitting the <Return> key will have no effect. The default is None.

master

This is used by the activate() method to control whether the window is made transient during modal dialogs. See the activate() method. The default is 'parent'.

separatorwidth

Initialisation option. If this is greater than 0, a separator line with the specified width will be created between the button box and the child site, as a component named separator. Since the default border of the button box and child site is raised, this option does not usually need to be set for there to be a visual separation between the button box and child site. The default is 0.

title

This is the title that the window manager displays in the title bar of the window. The default is None.

Components

Components created by this megawidget and its base classes are described below.

buttonbox

This is the button box containing the buttons for the dialog. By default it is created with the options (hull_borderwidth = 1, hull_relief = 'raised'). By default, this component is a Pmw.ButtonBox.

dialogchildsite

This is the child site for the dialog, which may be used to specialise the megawidget by creating other widgets within it. By default it is created with the options (borderwidth = 1, relief = 'raised'). By default, this component is a tkinter.Frame.

hull

This acts as the body for the entire megawidget. Other components are created as children of the hull to further specialise this class. By default, this component is a tkinter.Toplevel.

scrolledlist

The scrolled list for the user to enter a value. By default, this component is a Pmw.ScrolledListBox.

separator

If the separatorwidth initialisation option is non-zero, the separator component is the line dividing the area between the button box and the child site. By default, this component is a tkinter.Frame.

Component aliases

Sub-components of components of this megawidget may be accessed via the following aliases.

label

Alias for scrolledlist_label.

listbox

Alias for scrolledlist_listbox.

Methods

Only methods specific to this megawidget are described below. For a description of its inherited methods, see the manual for its base class Pmw.Dialog. In addition, methods from the Pmw.ScrolledListBox class are forwarded by this megawidget to the scrolledlist component.

bbox(index)

This method is explicitly forwarded to the listbox component's bbox() method. Without this explicit forwarding, the bbox() method (aliased to grid_bbox()) of the hull would be invoked, which is probably not what the programmer intended.

size()

This method is explicitly forwarded to the listbox component's size() method. Without this explicit forwarding, the size() method (aliased to grid_size()) of the hull would be invoked, which is probably not what the programmer intended.

Example

The image at the top of this manual is a snapshot of the window (or part of the window) produced by the following code.

class Demo:
    def __init__(self, parent):
        # Create the dialog.
        self.dialog = Pmw.SelectionDialog(parent,
            title = 'My SelectionDialog',
            buttons = ('OK', 'Cancel'),
            defaultbutton = 'OK',
            scrolledlist_labelpos = 'n',
            label_text = 'What do you think of Pmw?',
            scrolledlist_items = ('Cool man', 'Cool', 'Good', 'Bad', 'Gross'),
            command = self.execute)
        self.dialog.withdraw()

        # Create button to launch the dialog.
        w = tkinter.Button(parent, text = 'Show selection dialog',
                command = self.dialog.activate)
        w.pack(padx = 8, pady = 8)

    def execute(self, result):
        sels = self.dialog.getcurselection()
        if len(sels) == 0:
            print('You clicked on ' + result + ' (no selection)')
        else:
            print('You clicked on ' + result + ' ' + sels[0])
        self.dialog.deactivate(result)