Thuban/UI/command.py

# Copyright (C) 2001, 2002 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Command Objects.

Command objects represent a command that a user can invoke and act as
mediators between the GUI and the application.

This module also defines a command registry that maps command names to
command objects.
"""

__version__ = "$Revision$"


from types import TupleType


class Command:

    """
    Represent a single command.

    A command is identified by a name, it has a title (used in menu
    items and buttons, etc) and a callable object that can be invoked
    with the context as a single parameter. The context is an object
    with a few public attributes for the application object, the session
    and the main window.

    Additionally, a command may have functions that can determine
    whether the command can be invoked or whether it is checked in case
    of a toggled command. These functions are called with just the
    context as parameters.
    """
    
    args = ()
    kwargs = None
    sensitive  = None
    checked = None
    dyntext = None

    def __init__(self, name, title, function, helptext = "", icon = "",
                 args = (), kwargs = None,
                 sensitive = None, checked = None, dyntext = None):
        self.name = name
        self.title = title
        self.function = function
        self.helptext = helptext
        self.icon = icon
        if args != ():
            if type(args) != TupleType:
                args = (args,)
            self.args = args
        if kwargs is not None:
            self.kwargs = kwargs
        if sensitive is not None:
            self.sensitive = sensitive
        if checked is not None:
            self.checked = checked
        if dyntext is not None:
            self.dyntext = dyntext

    def Name(self):
        return self.name

    def Title(self):
        return self.title

    def HelpText(self):
        return self.helptext

    def Icon(self):
        return self.icon

    def Sensitive(self, context):
        if self.sensitive is not None:
            return self.sensitive(context)
        return 1

    def Checked(self, context):
        if self.checked is not None:
            return self.checked(context)
        return 0 # XXX raise an exception?

    def IsCheckCommand(self):
        return self.checked is not None

    def DynText(self, context):
        if self.dyntext is not None:
            return self.dyntext(context)
        return self.Title()

    def HasDynText(self):
        return self.dyntext is not None

    def IsDynamic(self):
        """Return true if the command is in any way dynamic"""
        return (self.sensitive is not None
                or self.checked is not None
                or self.dyntext is not None)

    def Execute(self, context, args = ()):
        kw = self.kwargs
        if kw is None:
            kw = {}
        if type(args) != TupleType:
            args = (args,)
        #print self.name, self.args, args
        apply(self.function, (context,) + self.args + args, kw)


class CommandRegistry:

    """
    A CommandRegistry maps command names to command objects
    """

    def __init__(self):
        self.registry = {}

    def Add(self, script):
        self.registry[script.name] = script

    def AddFunction(self, name, title, function, args = (), sensitive = None):
        self.Add(Command(name, title, function, args = args,
                         sensitive = sensitive))

    def Command(self, name):
        return self.registry.get(name, None)


# The central command registry
registry = CommandRegistry()
1	bh	183	# Copyright (C) 2001, 2002 by Intevation GmbH
2	bh	6	# Authors:
3			# Bernhard Herzog <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			"""
9			Command Objects.
10
11			Command objects represent a command that a user can invoke and act as
12			mediators between the GUI and the application.
13
14			This module also defines a command registry that maps command names to
15			command objects.
16			"""
17
18			__version__ = "$Revision$"
19
20
21			from types import TupleType
22
23
24			class Command:
25
26			"""
27			Represent a single command.
28
29	bh	183	A command is identified by a name, it has a title (used in menu
30			items and buttons, etc) and a callable object that can be invoked
31	bh	221	with the context as a single parameter. The context is an object
32			with a few public attributes for the application object, the session
33			and the main window.
34	bh	6
35			Additionally, a command may have functions that can determine
36			whether the command can be invoked or whether it is checked in case
37			of a toggled command. These functions are called with just the
38			context as parameters.
39			"""
40
41			args = ()
42			kwargs = None
43			sensitive = None
44			checked = None
45			dyntext = None
46
47			def __init__(self, name, title, function, helptext = "", icon = "",
48			args = (), kwargs = None,
49			sensitive = None, checked = None, dyntext = None):
50			self.name = name
51			self.title = title
52			self.function = function
53			self.helptext = helptext
54			self.icon = icon
55			if args != ():
56			if type(args) != TupleType:
57			args = (args,)
58			self.args = args
59			if kwargs is not None:
60			self.kwargs = kwargs
61			if sensitive is not None:
62			self.sensitive = sensitive
63			if checked is not None:
64			self.checked = checked
65			if dyntext is not None:
66			self.dyntext = dyntext
67
68			def Name(self):
69			return self.name
70
71			def Title(self):
72			return self.title
73
74			def HelpText(self):
75			return self.helptext
76
77			def Icon(self):
78			return self.icon
79
80			def Sensitive(self, context):
81			if self.sensitive is not None:
82			return self.sensitive(context)
83			return 1
84
85			def Checked(self, context):
86			if self.checked is not None:
87			return self.checked(context)
88			return 0 # XXX raise an exception?
89
90			def IsCheckCommand(self):
91			return self.checked is not None
92
93			def DynText(self, context):
94			if self.dyntext is not None:
95			return self.dyntext(context)
96			return self.Title()
97
98			def HasDynText(self):
99			return self.dyntext is not None
100
101			def IsDynamic(self):
102			"""Return true if the command is in any way dynamic"""
103			return (self.sensitive is not None
104			or self.checked is not None
105			or self.dyntext is not None)
106
107			def Execute(self, context, args = ()):
108			kw = self.kwargs
109			if kw is None:
110			kw = {}
111			if type(args) != TupleType:
112			args = (args,)
113			#print self.name, self.args, args
114			apply(self.function, (context,) + self.args + args, kw)
115
116
117			class CommandRegistry:
118
119			"""
120			A CommandRegistry maps command names to command objects
121			"""
122
123			def __init__(self):
124			self.registry = {}
125
126			def Add(self, script):
127			self.registry[script.name] = script
128
129			def AddFunction(self, name, title, function, args = (), sensitive = None):
130			self.Add(Command(name, title, function, args = args,
131			sensitive = sensitive))
132
133			def Command(self, name):
134			return self.registry.get(name, None)
135
136
137
138			# The central command registry
139			registry = CommandRegistry()
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