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ruby--ruby/ext/tk/MANUAL_tcltklib.eng
nagai 59a07a0690 Ruby/Tk :: provisional support on Ruby-VM and Tcl/Tk8.5. 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2007-12-21 08:57:35 +00:00

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2005/07/05 Hidetoshi NAGAI
This document discribes about the 'tcltklib' library. Although there
is the 'tcltk' library (tcltk.rb) under this directory, no description
in this document (because it is not maintained recently).
==============================================================
module TclTklib
: Defines methods to do operations which are independed on
: Tcl/Tk interpreters
module TclTkLib::EventFlag
: Defines flags to define taget events on 'do_one_event' methos.
: When to give, please use bit-operator (e.g. WINDOW | DONT_WAIT).
[constants]
NONE
: Is 0. It means "there is no target". But on the real
: operation, it is same to ALL.
WINDOW
: 'window' event is processed.
FILE
: 'file' event is processed.
TIMER
: 'timer' event is processed.
IDLE
: 'idle' operation (e.g. 're-draw'; the operations when the
: other kinds of events doesn't occur) is processed.
ALL
: All kinds of events are processed.
: Same to 'WINDOW | FILE | TIMER | IDLE'.
DONT_WAIT
: Without this flag, 'do_one_event' waits the occurence of
: a target event. With this flag, doesn't wait and returns
: false if there is no target event for processing.
module TclTkLib::VarAccessFlag
: Defines flags to give '_get_variable' and so on. When to give,
: please use bit-operator (e.g. GLOBAL_ONLY | LEAVE_ERR_MSG ).
[constants]
NONE
: Is 0. It means "set no flag".
GLOBAL_ONLY
: (site Tcl/Tk's man page)
: Under normal circumstances the procedures look up
: variables as follows: If a procedure call is active
: in interp, a variable is looked up at the current
: level of procedure call. Otherwise, a variable is
: looked up first in the current namespace, then in
: the global namespace. However, if this bit is set
: in flags then the variable is looked up only in the
: global namespace even if there is a procedure call
: active. If both GLOBAL_ONLY and NAMESPACE_ONLY are
: given, GLOBAL_ONLY is ignored.
:
: *** ATTENTION ***
: Tcl7.6 doesn't have namespaces. So NAMESPACE_ONLY
: is defined as 0, and then GLOBAL_ONLY is available
: even if flag is (GLOBAL_ONLY | NAMESPACE_ONLY).
NAMESPACE_ONLY
: (site Tcl/Tk's man page)
: Under normal circumstances the procedures look up
: variables as follows: If a procedure call is active
: in interp, a variable is looked up at the current
: level of procedure call. Otherwise, a variable is
: looked up first in the current namespace, then in
: the global namespace. However, if this bit is set
: in flags then the variable is looked up only in the
: current namespace even if there is a procedure call
: active.
:
: *** ATTENTION ***
: Tcl7.6 doesn't have namespaces. So NAMESPACE_ONLY
: is defined as 0.
LEAVE_ERR_MSG
: (site Tcl/Tk's man page)
: If an error is returned and this bit is set in flags,
: then an error message will be left in the interpreter's
: result, where it can be retrieved with Tcl_GetObjResult
: or Tcl_GetStringResult. If this flag bit isn't set then
: no error message is left and the interpreter's result
: will not be modified.
APPEND_VALUE
: (site Tcl/Tk's man page)
: If this bit is set then newValue is appended to the
: current value, instead of replacing it. If the variable
: is currently undefined, then this bit is ignored.
LIST_ELEMENT
: (site Tcl/Tk's man page)
: If this bit is set, then newValue is converted to a
: valid Tcl list element before setting (or appending
: to) the variable. A separator space is appended before
: the new list element unless the list element is going
: to be the first element in a list or sublist (i.e. the
: variable's current value is empty, or contains the
: single character ``{'', or ends in `` }'').
PARSE_VARNAME
: (site Tcl/Tk's man page)
: If this bit is set when calling _set_variable and so
: on, var_name argument may contain both an array and an
: element name: if the name contains an open parenthesis
: and ends with a close parenthesis, then the value
: between the parentheses is treated as an element name
: (which can have any string value) and the characters
: before the first open parenthesis are treated as the
: name of an array variable. If the flag PARSE_VARNAME
: is given, index_name argument should be 'nil' since the
: array and element names are taken from var_name.
:
: *** ATTENTION ***
: Tcl7.6 doesn't have this flag. So PARSE_VARNAME is
: defined as 0.
module TclTkLib::RELEASE_TYPE
: Defines release type number of Tcl/Tk
ALPHA
: ALPHA release
BETA
: BETA release
FINAL
: FINAL release
[module methods]
get_version()
: return an array of major, minor, release-type number,
: number, release-type name, and patchlevel of current
: Tcl/Tk library.
mainloop(check_root = true)
: Starts the eventloop. If 'check_root' is true, this method
: doesn't return when a root widget exists.
: If 'check_root' is false, doen't return by the other
: reasons than exceptions.
mainloop_thread?
: Returns whether the current thread executes the eventloop.
: If true, the eventloop is working on the current thread.
: If no eventloop is working, this method returns nil.
: And if the other thread executes the eventloop, returns false.
:
: *** ATTENTION ***
: When this methods returns false, it is dangerous to call a Tk
: interpreter directly.
mainloop_watchdog(check_root = true)
: On the normal eventloop, some kinds of callback operations
: cause deadlock. To avoid some of such deadlocks, this
: method starts an eventloop and a watchdog-thread.
do_one_event(flag = TclTkLib::EventFlag::ALL |
TclTkLib::EventFlag::DONT_WAIT)
: Do one event for processing. When processed an event,
: returns true.
: If NOT set DONT_WAIT flag, this method waits occurrence of
: a target event.
: If set DONT_WAIT flag and no event for processing, returns
: false immediately.
: If $SAFE >= 4, or $SAFE >= 1 and the flag is tainted,
: force to set DONT_WAIT flag.
set_eventloop_tick(timer_tick)
: Define the interval of thread-switching with an integer
: value of mili-seconds.
: Default timer_tick is 0. It means that thread-switching
: is based on the count of processed events.
: ( see 'set_eventloop_weight' method )
: However, if the eventloop thread is the only thread,
: timer_tick cannt be set to 0. If 0, then is set to 100 ms
: automatically (see NO_THREAD_INTERRUPT_TIME on tcltklib.c).
: On $SAFE >= 4, cannot call this method.
get_eventloop_tick
: Get current value of 'timer_tick'
set_no_event_wait(no_event_wait)
: Define sleeping time of the eventloop when two or more
: thread are running and there is no event for processing.
: Default value is 20 (ms).
: If the eventloop thread is the only thread, this value is
: invalid.
: On $SAFE >= 4, cannot call this method.
get_no_event_wait
: Get current value of 'no_event_wait'.
set_eventloop_weight(loop_max, no_event_tick)
: Define the weight parameters for the eventloop thread.
: That is invalid when the eventloop is the only thread.
: 'loop_max' is the max events for thread-switching.
: 'no_event_tick' is the increment value of the event count
: when no event for processing (And then, the eventloop thead
: sleeps 'no_event_wait' mili-seconds).
: 'loop_max == 800' and 'no_event_tick == 10' are defalut.
: On $SAFE >= 4, cannot call this method.
get_eventloop_weight
: Get current values of 'loop_max' and 'no_event_tick'.
mainloop_abort_on_exception=(bool)
: Define whether the eventloop stops on exception or not.
: If true (default value), stops on exception.
: If false, show a warinig message but ignore the exception.
: If nil, no warning message and ignore the excepsion.
: This parameter is sometimes useful when multiple Tk
: interpreters are working. Because the only one eventloop
: admins all Tk interpreters, sometimes exception on a
: interpreter kills the eventloop thread. Even if such
: situation, when abort_on_exception == false or nil,
: the eventloop ignores the exception and continue to working.
: On $SAFE >= 4, cannot call this method.
mainloop_abort_on_exception
: Get current status of that.
num_of_mainwindows
: Returns the number of main-windows (root-widget).
: Because there is only one main-window for one Tk interpreter,
: the value is same to the number of interpreters which has
: available Tk functions.
_merge_tklist(str, str, ... )
: Get a Tcl's list string from arguments with a Tcl/Tk's
: library function. Each arguemnt is converted to a valid
: Tcl list element.
_conv_listelement(str)
: Convert the argument to a valid Tcl list element with
: Tcl/Tk's library function.
_toUTF8(str, encoding=nil)
_fromUTF8(str, encoding=nil)
: Call the function (which is internal function of Tcl/Tk) to
: convert to/from a UTF8 string.
_subst_UTF_backslash(str)
_subst_Tcl_backslash(str)
: Substitute backslash sequence with Tcl's rule (include \uhhhh;
: give a sixteen-bit hexadecimal value for Unicode character).
: _subst_Tcl_backslash method parses all backslash sequence.
: _subst_UTF_backslash method parses \uhhhh only.
encoding_system
encoding_system=(encoding)
: Get and set Tcl's system encoding.
encoding
encoding=(encoding)
: alias of encoding_system / encoding_system=
: ( probably, Ruby/Tk's tk.rb will override them )
class TclTkIp
[class methods]
new(ip_name=nil, options='')
: Generate an instance of TclTkIp class.
: If 'ip_name' argument is given as a string, it is the name
: of the Tk interpreter which is shown by 'winfo interps'
: command.
: 'options' argument accepts a string which is the command
: line options of wish; such as '-geometry' or '-use'.
: The information is used to generate the root widget of the
: interpreter.
: ( e.g. TclTkIp.new('FOO', '-geometry 500x200 -use 0x2200009') )
: If is given nil or falsr for the 'option' argument, generates
: the Tcl interpreter without Tk library. Then the interpreter
: doesn't need GUI environment. Therefore, even if a window
: system doesn't exist or cannot be used, Ruby can control the
: Tcl interpreter and the extention libraries loaded on the
: interpreter.
[instance methods]
create_slave(name, safe=false)
: Create a slave interpreter.
: The parent of the interpreter is the receiver of this method.
: The name of the slave interpreter is given by 'name' argument.
: The 'safe' argument decides whether the slave interpreter is
: created as a safe interpreter or not. If true, create a safe
: interpreter. Default is false. However, if the parent
: interpreter is a safe interpreter, the created interpreter is
: a safe interpreter (ignore 'safe' argument value).
: If $SAFE >= 4, can create a safe interpreter only.
make_safe
: Make the interpreter to the safe interpreter, and returns
: self. If fail, raise RuntimeError.
safe?
: Check whether the interpreter is the safe interpreter.
: If is the safe interpreter, returns true.
allow_ruby_exit?
: Return the mode whether 'exit' function of ruby or 'exit'
: command of Tcl/Tk can quit the ruby process or not on the
: interpreter. If false, such a command quit the interpreter
: only.
: The default value for a master interpreter is true, and
: for a slave interpreter is false.
allow_ruby_exit=(mode)
: Change the mode of 'allow_ruby_exit?'.
: If $SAFE >= 4 or the interpreter is a "safe" interpreter,
: this is not permitted (raise an exception).
delete
: Delete the interpreter.
: The deleted interpreter doesn't accept command and then
: raise an exception.
deleted?
: Check whether the interpreter is already deleted.
: If deleted, returns true.
has_mainwindow?
: Check whether the interpreter has a MainWindow (root widget).
: If has, returns true. If doesn't, returns false.
: If IP is already deleted, returns nil.
restart
: Restart Tk part of the interpreter.
: Use this when you need Tk functions after destroying the
: root widget.
: On $SAFE >= 4, cannot call this method.
_eval(str)
_invoke(*args)
: Estimates the arguments as a command on the Tk interpreter.
: The argument of _eval is a script of Tcl/Tk.
: Each argument of _invoke is a token of one command line of
: Tcl/Tk.
: Because the operation of _invoke doesn't through the
: command line parser of Tk interpreter, the cost of
: estimation is smaller than _eval. However, auto_load
: mechanism of the Tk interpreter doesn't work on _invoke.
: So _invoke can call only the command which already
: registered on the interpreter by 'load' command and so on.
: On _eval command, auto_load mechanism words. So if succeed
: to _eval and regist the command once, after that, the
: command can be called by _invoke.
_toUTF8(str, encoding=nil)
_fromUTF8(str, encoding=nil)
: Call the function (which is internal function of Tcl/Tk) to
: convert to/from a UTF8 string.
_thread_vwait(var_name)
_thread_tkwait(mode, target)
: 'vwait' or 'tkwait' with thread support.
: The difference from normal 'vwait' or 'tkwait' command is
: doing independent wait from the vwait stack when they are
: called on the other thread than the eventloop thread.
: In the case of Tcl/Tk's vwait / tkwait, if 2nd vwait /
: tkwait is called on waiting for 1st vwait / tkwait,
: returns the order of [2nd]->[1st] regardless of the order
: of when the wait condition was fulfilled.
: If _thread_vwait / _thread_tkwait is called on the
: eventloop thread, there is no difference from vwait /
: tkwait. But if called on the other thread than the
: eventloop, stops the thread. And when the wait condition
: is fulfilled, the thread restarts. The meaning of
: "independent from the vwait stack" is that the timing of
: restarting is independent from the waiting status of the
: other threads. That is, even if the eventloop thread is
: waiting by vwait and is not fulfilled the condition,
: _thread_vwait completes the waiting when its waiting
: condition is fulfilled and the thread which stopped by
: _thread_vwait can continue the operation.
_return_value
: Get the last result value on the interpreter.
_get_variable(var_name, flag)
_get_variable2(var_name, index_name, flag)
: Get the current value of a variable. If specified a
: index_name (see also the PARSE_VARNAME flag), get the
: value of the index_name element.
_set_variable(var_name, value, flag)
_set_variable2(var_name, index_name, value, flag)
: Create or modify a variable. If specified a index_name
: (see also the PARSE_VARNAME flag), create or modify the
: index_name element.
_unset_variable(var_name)
_unset_variable2(var_name, index_name)
: Remove a variable. If specified a index_name (see also
: the PARSE_VARNAME flag), remove the index_name element.
_get_global_var(var_name)
_get_global_var2(var_name, index_name)
_set_global_var(var_name, value)
_set_global_var2(var_name, index_name, value)
_unset_global_var(var_name)
_unset_global_var2(var_name, index_name)
: Call the associated method with the flag argument
: (GLOBAL_ONLY | LEAVE_ERR_MSG).
_split_tklist(str)
: Split the argument with Tcl/Tk's library function and
: get an array as a list of Tcl list elements.
_merge_tklist(str, str, ... )
: Get a Tcl's list string from arguments with a Tcl/Tk's
: library function. Each arguemnt is converted to a valid
: Tcl list element.
_conv_listelement(str)
: Convert the argument to a valid Tcl list element with
: Tcl/Tk's library function.
mainloop
mainloop_watchdog
: If on the slave interpreter, never start an eventloop and
: returns nil.
: With the exception that, same to the TclTkLib module method
: with the same name.
do_one_event
: With the exception that the argument is forced to set
: DONT_WAIT flag on the slave interpreter, same to
: TclTkLib#do_one_event.
set_eventloop_tick
get_eventloop_tick
set_no_event_wait
get_no_event_wait
set_eventloop_weight
get_eventloop_weight
mainloop_abort_on_exception
mainloop_abort_on_exception=
: With the exception that it is ignored to set value on the
: slave interpreter, same to the TclTkLib module method with
: the same name.
class TkCallbackBreak < StandardError
class TkCallbackContinue < StandardError
: They are exception classes to break or continue the Tk callback
: operation.
: If raise TkCallbackBreak on the callback procedure, Ruby returns
: 'break' code to Tk interpreter (Then the Tk interpreter will
: break the operation for the current event).
: If raise TkCallbackContinue, returns 'continue' code (Then the Tk
: interpreter will break the operateion for the current bindtag and
: starts the operation for the next buindtag for the current event).
(eof)
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