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281 lines
6.6 KiB
Python
281 lines
6.6 KiB
Python
# Module 'panel'
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#
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# Support for the Panel library.
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# Uses built-in module 'pnl'.
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# Applications should use 'panel.function' instead of 'pnl.function';
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# most 'pnl' functions are transparently exported by 'panel',
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# but dopanel() is overridden and you have to use this version
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# if you want to use callbacks.
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import pnl
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debug = 0
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# Test if an object is a list.
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#
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def is_list(x):
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return type(x) == type([])
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# Reverse a list.
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#
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def reverse(list):
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res = []
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for item in list:
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res.insert(0, item)
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return res
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# Get an attribute of a list, which may itself be another list.
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# Don't use 'prop' for name.
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#
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def getattrlist(list, name):
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for item in list:
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if item and is_list(item) and item[0] == name:
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return item[1:]
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return []
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# Get a property of a list, which may itself be another list.
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#
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def getproplist(list, name):
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for item in list:
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if item and is_list(item) and item[0] == 'prop':
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if len(item) > 1 and item[1] == name:
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return item[2:]
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return []
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# Test if an actuator description contains the property 'end-of-group'
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#
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def is_endgroup(list):
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x = getproplist(list, 'end-of-group')
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return (x and x[0] == '#t')
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# Neatly display an actuator definition given as S-expression
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# the prefix string is printed before each line.
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#
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def show_actuator(prefix, a):
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for item in a:
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if not is_list(item):
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print prefix, item
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elif item and item[0] == 'al':
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print prefix, 'Subactuator list:'
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for a in item[1:]:
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show_actuator(prefix + ' ', a)
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elif len(item) == 2:
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print prefix, item[0], '=>', item[1]
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elif len(item) == 3 and item[0] == 'prop':
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print prefix, 'Prop', item[1], '=>',
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print item[2]
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else:
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print prefix, '?', item
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# Neatly display a panel.
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#
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def show_panel(prefix, p):
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for item in p:
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if not is_list(item):
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print prefix, item
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elif item and item[0] == 'al':
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print prefix, 'Actuator list:'
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for a in item[1:]:
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show_actuator(prefix + ' ', a)
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elif len(item) == 2:
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print prefix, item[0], '=>', item[1]
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elif len(item) == 3 and item[0] == 'prop':
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print prefix, 'Prop', item[1], '=>',
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print item[2]
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else:
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print prefix, '?', item
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# Exception raised by build_actuator or build_panel.
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#
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panel_error = 'panel error'
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# Dummy callback used to initialize the callbacks.
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#
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def dummy_callback(arg):
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pass
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# Assign attributes to members of the target.
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# Attribute names in exclist are ignored.
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# The member name is the attribute name prefixed with the prefix.
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#
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def assign_members(target, attrlist, exclist, prefix):
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for item in attrlist:
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if is_list(item) and len(item) == 2 and item[0] not in exclist:
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name, value = item[0], item[1]
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ok = 1
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if value[0] in '-0123456789':
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value = eval(value)
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elif value[0] == '"':
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value = value[1:-1]
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elif value == 'move-then-resize':
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# Strange default set by Panel Editor...
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ok = 0
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else:
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print 'unknown value', value, 'for', name
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ok = 0
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if ok:
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lhs = 'target.' + prefix + name
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stmt = lhs + '=' + repr(value)
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if debug: print 'exec', stmt
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try:
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exec stmt + '\n'
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except KeyboardInterrupt: # Don't catch this!
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raise KeyboardInterrupt
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except:
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print 'assign failed:', stmt
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# Build a real actuator from an actuator description.
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# Return a pair (actuator, name).
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#
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def build_actuator(descr):
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namelist = getattrlist(descr, 'name')
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if namelist:
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# Assume it is a string
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actuatorname = namelist[0][1:-1]
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else:
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actuatorname = ''
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type = descr[0]
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if type[:4] == 'pnl_': type = type[4:]
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act = pnl.mkact(type)
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act.downfunc = act.activefunc = act.upfunc = dummy_callback
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#
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assign_members(act, descr[1:], ['al', 'data', 'name'], '')
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#
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# Treat actuator-specific data
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#
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datalist = getattrlist(descr, 'data')
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prefix = ''
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if type[-4:] == 'puck':
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prefix = 'puck_'
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elif type == 'mouse':
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prefix = 'mouse_'
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assign_members(act, datalist, [], prefix)
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#
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return act, actuatorname
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# Build all sub-actuators and add them to the super-actuator.
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# The super-actuator must already have been added to the panel.
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# Sub-actuators with defined names are added as members to the panel
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# so they can be referenced as p.name.
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#
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# Note: I have no idea how panel.endgroup() works when applied
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# to a sub-actuator.
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#
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def build_subactuators(panel, super_act, al):
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#
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# This is nearly the same loop as below in build_panel(),
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# except a call is made to addsubact() instead of addact().
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#
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for a in al:
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act, name = build_actuator(a)
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act.addsubact(super_act)
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if name:
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stmt = 'panel.' + name + ' = act'
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if debug: print 'exec', stmt
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exec stmt + '\n'
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if is_endgroup(a):
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panel.endgroup()
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sub_al = getattrlist(a, 'al')
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if sub_al:
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build_subactuators(panel, act, sub_al)
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#
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# Fix the actuator to which whe just added subactuators.
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# This can't hurt (I hope) and is needed for the scroll actuator.
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#
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super_act.fixact()
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# Build a real panel from a panel definition.
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# Return a panel object p, where for each named actuator a, p.name is a
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# reference to a.
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#
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def build_panel(descr):
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#
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# Sanity check
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#
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if (not descr) or descr[0] != 'panel':
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raise panel_error, 'panel description must start with "panel"'
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#
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if debug: show_panel('', descr)
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#
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# Create an empty panel
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#
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panel = pnl.mkpanel()
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#
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# Assign panel attributes
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#
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assign_members(panel, descr[1:], ['al'], '')
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#
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# Look for actuator list
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#
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al = getattrlist(descr, 'al')
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#
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# The order in which actuators are created is important
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# because of the endgroup() operator.
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# Unfortunately the Panel Editor outputs the actuator list
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# in reverse order, so we reverse it here.
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#
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al = reverse(al)
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#
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for a in al:
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act, name = build_actuator(a)
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act.addact(panel)
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if name:
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stmt = 'panel.' + name + ' = act'
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exec stmt + '\n'
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if is_endgroup(a):
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panel.endgroup()
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sub_al = getattrlist(a, 'al')
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if sub_al:
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build_subactuators(panel, act, sub_al)
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#
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return panel
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# Wrapper around pnl.dopanel() which calls call-back functions.
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#
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def my_dopanel():
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# Extract only the first 4 elements to allow for future expansion
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a, down, active, up = pnl.dopanel()[:4]
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if down:
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down.downfunc(down)
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if active:
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active.activefunc(active)
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if up:
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up.upfunc(up)
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return a
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# Create one or more panels from a description file (S-expressions)
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# generated by the Panel Editor.
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#
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def defpanellist(file):
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import panelparser
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descrlist = panelparser.parse_file(open(file, 'r'))
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panellist = []
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for descr in descrlist:
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panellist.append(build_panel(descr))
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return panellist
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# Import everything from built-in method pnl, so the user can always
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# use panel.foo() instead of pnl.foo().
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# This gives *no* performance penalty once this module is imported.
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#
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from pnl import * # for export
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dopanel = my_dopanel # override pnl.dopanel
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