Pmw.MegaToplevel

Name

Pmw.MegaToplevel() - base class for megawidgets within a toplevel

Inherits

Pmw.MegaArchetype

Description

This class creates a megawidget contained within a toplevel window. It may be used directly to create a toplevel megawidget or it may be used as a base class for more specialised toplevel megawidgets, such as Pmw.Dialog. It creates a Tkinter.Toplevel component, named hull, to act as the container of the megawidget. The window class name for the hull widget is set to the most-specific class name for the megawidget. Derived classes specialise this class by creating other widget components as children of the hull widget.

The megawidget may be used as either a normal toplevel window or as a modal dialog. Use show() and withdraw() for normal use and activate() and deactivate() for modal dialog use. If the window is deleted by the window manager while being shown normally, the default behaviour is to destroy the window. If the window is deleted by the window manager while the window is active (ie: when used as a modal dialog), the window is deactivated. Use the userdeletefunc() and usermodaldeletefunc() methods to override these behaviours. Do not call protocol() to set the WM_DELETE_WINDOW window manager protocol directly if you want to use this window as a modal dialog.

The currently active windows form a stack with the most recently activated window at the top of the stack. All mouse and keyboard events are sent to this top window. When it deactivates, the next window in the stack will start to receive events.

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.

deactivatecommand

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

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.

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.

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.MegaArchetype. In addition, methods from the Tkinter.Toplevel class are forwarded by this megawidget to the hull component.

activate(globalMode = 0, geometry = 'centerscreenfirst')

Display the window as a modal dialog. This means that all mouse and keyboard events go to this window and no other windows can receive any events. If you do not want to restrict mouse and keyboard events to this window, use the show() method instead.

If the BLT extension to Tk is present, a busy cursor will be displayed on other toplevel windows, using Pmw.showbusycursor().

The activate() method does not return until the deactivate() method is called, when the window is withdrawn, the grab released and the result returned.

If globalMode is false, the window will grab control of the pointer and keyboard, preventing any events from being delivered to any other toplevel windows within the application. If globalMode is true, the grab will prevent events from being delivered to any other toplevel windows regardless of application. Global grabs should be used sparingly, if at all.

If globalMode is 'nograb', then no grab is performed. If BLT is present, this will allow mouse and keyboard events to be received by other windows whose exclude busycursor attribute has been set to true by a call to Pmw.setbusycursorattributes(). Note that if 'nograb' is used and BLT is not present, then all other windows will receive mouse and keyboard events. This is because, in plain Tk, there is no way to specify that two windows (only) receive events. If your application may be used without BLT, then do not use 'nograb'.

When the window is displayed, it is positioned on the screen according to geometry which may be one of:

centerscreenfirst

The window will be centered the first time it is activated. On subsequent activations it will be positioned in the same position as the last time it was displayed, even if it has been moved by the user.

centerscreenalways

The window will be be centered on the screen (halfway across and one third down).

first + spec

It is assumed that the rest of the argument (after 'first') is a standard geometry specification. The window will be positioned using this specification the first time it is activated. On subsequent activations it will be positioned in the same position as the last time it was displayed, even if it has been moved by the user. For example, geometry = first+100+100 will initially display the window at position (100,100). Other calls to activate() will not change the previous position of the window.

spec

This is a standard geometry specification. The window will be be positioned using this specification.

If the BLT Tcl extension library is present, a clock cursor will be displayed until the window is deactivated.

If the activatecommand option is callable, it is called just before the window begins to wait for the result.

If the master option is not None, the window will become a transient window of master, which should be a toplevel window. If master has the special value of 'parent', the master is the toplevel window of the window's parent.

active()

Return true if the megawidget is currently active (that is, activate() is currently waiting for a result to be passed to it by a call to deactivate()).

deactivate(result = None)

This should be called while a call to activate() is waiting. It will withdraw the window, release the grab and cause the activate() call to return with the value of result.

If the deactivatecommand option is callable, it is called just before the deactivate() method returns.

destroy()

Destroy the hull component widget, including all of its children. If the megawidget is currently active, deactivate it.

show(master = None)

Make the window visible. This raises or deiconifies the toplevel window. If the window has previously been shown it will remain in the same position. This means that calling withdraw() then show() will not move the window, whereas calling withdraw() then deiconify() may change the window's position. (This may depend on the behaviour of the window manager.)

userdeletefunc(func = None)

If func is None, return the function that will be called when the window is deleted by the window manager while being displayed normally. If func is not None, set this function to func. By default, the function is self.destroy.

usermodaldeletefunc(func = None)

If func is None, return the function that will be called when the window is deleted by the window manager while it is active (ie: when being used as a modal dialog). If func is not None, set this function to func. By default, the function is self.deactivate.