| 1 | """Switchboard class.
|
|---|
| 2 |
|
|---|
| 3 | This class is used to coordinate updates among all Viewers. Every Viewer must
|
|---|
| 4 | conform to the following interface:
|
|---|
| 5 |
|
|---|
| 6 | - it must include a method called update_yourself() which takes three
|
|---|
| 7 | arguments; the red, green, and blue values of the selected color.
|
|---|
| 8 |
|
|---|
| 9 | - When a Viewer selects a color and wishes to update all other Views, it
|
|---|
| 10 | should call update_views() on the Switchboard object. Note that the
|
|---|
| 11 | Viewer typically does *not* update itself before calling update_views(),
|
|---|
| 12 | since this would cause it to get updated twice.
|
|---|
| 13 |
|
|---|
| 14 | Optionally, Viewers can also implement:
|
|---|
| 15 |
|
|---|
| 16 | - save_options() which takes an optiondb (a dictionary). Store into this
|
|---|
| 17 | dictionary any values the Viewer wants to save in the persistent
|
|---|
| 18 | ~/.pynche file. This dictionary is saved using marshal. The namespace
|
|---|
| 19 | for the keys is ad-hoc; make sure you don't clobber some other Viewer's
|
|---|
| 20 | keys!
|
|---|
| 21 |
|
|---|
| 22 | - withdraw() which takes no arguments. This is called when Pynche is
|
|---|
| 23 | unmapped. All Viewers should implement this.
|
|---|
| 24 |
|
|---|
| 25 | - colordb_changed() which takes a single argument, an instance of
|
|---|
| 26 | ColorDB. This is called whenever the color name database is changed and
|
|---|
| 27 | gives a chance for the Viewers to do something on those events. See
|
|---|
| 28 | ListViewer for details.
|
|---|
| 29 |
|
|---|
| 30 | External Viewers are found dynamically. Viewer modules should have names such
|
|---|
| 31 | as FooViewer.py. If such a named module has a module global variable called
|
|---|
| 32 | ADDTOVIEW and this variable is true, the Viewer will be added dynamically to
|
|---|
| 33 | the `View' menu. ADDTOVIEW contains a string which is used as the menu item
|
|---|
| 34 | to display the Viewer (one kludge: if the string contains a `%', this is used
|
|---|
| 35 | to indicate that the next character will get an underline in the menu,
|
|---|
| 36 | otherwise the first character is underlined).
|
|---|
| 37 |
|
|---|
| 38 | FooViewer.py should contain a class called FooViewer, and its constructor
|
|---|
| 39 | should take two arguments, an instance of Switchboard, and optionally a Tk
|
|---|
| 40 | master window.
|
|---|
| 41 |
|
|---|
| 42 | """
|
|---|
| 43 |
|
|---|
| 44 | import sys
|
|---|
| 45 | from types import DictType
|
|---|
| 46 | import marshal
|
|---|
| 47 |
|
|---|
| 48 |
|
|---|
| 49 | |
|---|
| 50 |
|
|---|
| 51 | class Switchboard:
|
|---|
| 52 | def __init__(self, initfile):
|
|---|
| 53 | self.__initfile = initfile
|
|---|
| 54 | self.__colordb = None
|
|---|
| 55 | self.__optiondb = {}
|
|---|
| 56 | self.__views = []
|
|---|
| 57 | self.__red = 0
|
|---|
| 58 | self.__green = 0
|
|---|
| 59 | self.__blue = 0
|
|---|
| 60 | self.__canceled = 0
|
|---|
| 61 | # read the initialization file
|
|---|
| 62 | fp = None
|
|---|
| 63 | if initfile:
|
|---|
| 64 | try:
|
|---|
| 65 | try:
|
|---|
| 66 | fp = open(initfile)
|
|---|
| 67 | self.__optiondb = marshal.load(fp)
|
|---|
| 68 | if not isinstance(self.__optiondb, DictType):
|
|---|
| 69 | print >> sys.stderr, \
|
|---|
| 70 | 'Problem reading options from file:', initfile
|
|---|
| 71 | self.__optiondb = {}
|
|---|
| 72 | except (IOError, EOFError, ValueError):
|
|---|
| 73 | pass
|
|---|
| 74 | finally:
|
|---|
| 75 | if fp:
|
|---|
| 76 | fp.close()
|
|---|
| 77 |
|
|---|
| 78 | def add_view(self, view):
|
|---|
| 79 | self.__views.append(view)
|
|---|
| 80 |
|
|---|
| 81 | def update_views(self, red, green, blue):
|
|---|
| 82 | self.__red = red
|
|---|
| 83 | self.__green = green
|
|---|
| 84 | self.__blue = blue
|
|---|
| 85 | for v in self.__views:
|
|---|
| 86 | v.update_yourself(red, green, blue)
|
|---|
| 87 |
|
|---|
| 88 | def update_views_current(self):
|
|---|
| 89 | self.update_views(self.__red, self.__green, self.__blue)
|
|---|
| 90 |
|
|---|
| 91 | def current_rgb(self):
|
|---|
| 92 | return self.__red, self.__green, self.__blue
|
|---|
| 93 |
|
|---|
| 94 | def colordb(self):
|
|---|
| 95 | return self.__colordb
|
|---|
| 96 |
|
|---|
| 97 | def set_colordb(self, colordb):
|
|---|
| 98 | self.__colordb = colordb
|
|---|
| 99 | for v in self.__views:
|
|---|
| 100 | if hasattr(v, 'colordb_changed'):
|
|---|
| 101 | v.colordb_changed(colordb)
|
|---|
| 102 | self.update_views_current()
|
|---|
| 103 |
|
|---|
| 104 | def optiondb(self):
|
|---|
| 105 | return self.__optiondb
|
|---|
| 106 |
|
|---|
| 107 | def save_views(self):
|
|---|
| 108 | # save the current color
|
|---|
| 109 | self.__optiondb['RED'] = self.__red
|
|---|
| 110 | self.__optiondb['GREEN'] = self.__green
|
|---|
| 111 | self.__optiondb['BLUE'] = self.__blue
|
|---|
| 112 | for v in self.__views:
|
|---|
| 113 | if hasattr(v, 'save_options'):
|
|---|
| 114 | v.save_options(self.__optiondb)
|
|---|
| 115 | # save the name of the file used for the color database. we'll try to
|
|---|
| 116 | # load this first.
|
|---|
| 117 | self.__optiondb['DBFILE'] = self.__colordb.filename()
|
|---|
| 118 | fp = None
|
|---|
| 119 | try:
|
|---|
| 120 | try:
|
|---|
| 121 | fp = open(self.__initfile, 'w')
|
|---|
| 122 | except IOError:
|
|---|
| 123 | print >> sys.stderr, 'Cannot write options to file:', \
|
|---|
| 124 | self.__initfile
|
|---|
| 125 | else:
|
|---|
| 126 | marshal.dump(self.__optiondb, fp)
|
|---|
| 127 | finally:
|
|---|
| 128 | if fp:
|
|---|
| 129 | fp.close()
|
|---|
| 130 |
|
|---|
| 131 | def withdraw_views(self):
|
|---|
| 132 | for v in self.__views:
|
|---|
| 133 | if hasattr(v, 'withdraw'):
|
|---|
| 134 | v.withdraw()
|
|---|
| 135 |
|
|---|
| 136 | def canceled(self, flag=1):
|
|---|
| 137 | self.__canceled = flag
|
|---|
| 138 |
|
|---|
| 139 | def canceled_p(self):
|
|---|
| 140 | return self.__canceled
|
|---|
