OTP-8058 The GUI parts are rewritten to use wxWidgets. Thanks Olle

          Mattsson!

          For the time being it is still possible to use the old GS based
          version of the tool, but it is deprecated. The wxWidgets based
          version is started by default.

          A new tutorial has been added to the documentation. It is based
          on Jayson Vantuyl's article
          http://souja.net/2009/04/making-sense-of-erlangs-event-tracer.htm
          l.

          The functions et:trace_me/4 and et:trace_me/5 has been introduced
          in order to replace the deprecated functions et:report_event/4
          and et:report_event/5. Hopefully the new names makes it a little
          more obvious what the intended usage of the functions are.

          A print function has been added to the GUI, in order to enable
          printing of sequence charts.

          More functionality for hiding unwanted events has been added to
          the GUI.

          The max_events, hide_unknown and display_mode configuration
          parameters to et_viewer is not used any more. Now the event cache
          in the Viewer only contains those events that actually are
          displayed in the GUI.

1 files changed, 41 insertions, 1451 deletions

diff --git a/lib/et/src/et_viewer.erl b/lib/et/src/et_viewer.erl
index ede2c401eb..d9bd01f8d0 100644
--- a/lib/et/src/et_viewer.erl
+++ b/lib/et/src/et_viewer.erl
@@ -1,19 +1,19 @@
 %%
 %% %CopyrightBegin%
-%% 
-%% Copyright Ericsson AB 2000-2009. All Rights Reserved.
-%% 
+%%
+%% Copyright Ericsson AB 2000-2010. All Rights Reserved.
+%%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
 %% compliance with the License. You should have received a copy of the
 %% Erlang Public License along with this software. If not, it can be
 %% retrieved online at http://www.erlang.org/.
-%% 
+%%
 %% Software distributed under the License is distributed on an "AS IS"
 %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 %% the License for the specific language governing rights and limitations
 %% under the License.
-%% 
+%%
 %% %CopyrightEnd%
 %%
 %%----------------------------------------------------------------------
@@ -22,66 +22,23 @@
 
 -module(et_viewer).
 
--behaviour(gen_server).
 
 %% External exports
 -export([file/1,
          start/0,
          start/1,
+         start/2,
 	 start_link/1,
+	 start_link/2,
+	 open_event/2,
 	 stop/1, 
          get_collector_pid/1]).
 
-%% gen_server callbacks
--export([init/1, terminate/2, code_change/3,
-         handle_call/3, handle_cast/2, handle_info/2]).
-
 -include("../include/et.hrl").
 -include("et_internal.hrl").
 
 -define(unknown, "UNKNOWN").
 
--record(state,
-        {parent_pid,       % Pid of parent process
-         collector_pid,    % Pid of collector process
-         event_order,      % Field to be used as primary key
-         trace_pattern,    % Collector trace pattern
-         active_filter,    % Name of the active filter
-         filters,          % List of possible filters
-         selected_actor,   % Actor selected by user
-         first_event,      % Key of first event (regardless of visibility)
-         last_event,       % Key of last event (regardless of visibility)
-         max_events,       % Maximum number of shown events
-         events,           % Queue containg all event keys (regardless of visibility)
-         max_actors,       % Maximum number of shown actors
-         actors,           % List of known actors
-         refresh_needed,   % Refresh is needed in order to show all actors
-         display_mode,     % Display all or only matching actors
-         detail_level,     % Show only events with lesser detail level
-         hide_actions,     % Hide/show events where to == from actor (bool)
-         hide_unknown,     % Hide/show events with unknown actor (bool)
-         is_suspended,     % Suspend viewer updates (bool)
-         title,            % GUI: Window title
-         win,              % GUI: Window object
-         menubar,          % GUI: Menu bar object
-         packer,           % GUI: Packer object
-         width,            % GUI: Window width
-         height,           % GUI: Window height
-         scale,            % GUI: Scaling factor on canvas
-         font,             % GUI: Font to be used on text labels
-         canvas_width,     % GUI: Canvas width
-         canvas_height,    % GUI: Canvas height
-         canvas,           % GUI: Canvas object
-         y_pos}).          % GUI: Current y position on canvas
-
--record(actor, {name, string}).
-
--define(initial_x, 10).
--define(incr_x,    60).
--define(initial_y, 15).
--define(incr_y,    15).
--define(detail_level_min, 0).
--define(detail_level_max, 100).
 
 %%%----------------------------------------------------------------------
 %%% Client side
@@ -99,7 +56,7 @@
 %%----------------------------------------------------------------------
 
 file(FileName) ->
-    start_link([{trace_client, {file, FileName}}]).
+    start_link([{trace_client, {file, FileName}}], default).
 
 %%----------------------------------------------------------------------
 %% start() -> ok
@@ -113,14 +70,19 @@ file(FileName) ->
 %%----------------------------------------------------------------------
 
 start() ->
-    start([{trace_global, true}]).
+    start([{trace_global, true}], default).
 
 %%----------------------------------------------------------------------
 %% start(Options) -> {ok, ViewerPid} | {error, Reason}
 %%----------------------------------------------------------------------
 
+start(GUI) when GUI =:= wx; GUI =:= gs; GUI =:= default ->
+    start_link([{trace_global, true}], GUI);
 start(Options) ->
-    start_link([{parent_pid, undefined} | Options]).
+    start_link([{parent_pid, undefined} | Options], default).
+
+start(Options, GUI) ->
+    start_link([{parent_pid, undefined} | Options], GUI).
 
 %%----------------------------------------------------------------------
 %% start_link(Options) -> {ok, ViewerPid} | {error, Reason}
@@ -177,216 +139,31 @@ start(Options) ->
 %% and returns false | true | {true, NewEvent}.
 %%----------------------------------------------------------------------
 
-start_link(Options) -> 
-    case parse_opt(Options, default_state(), []) of
-        {ok, S, CollectorOpt} ->
-            case S#state.collector_pid of
-                CollectorPid when pid(CollectorPid) ->
-                    case gen_server:start_link(?MODULE, [S], []) of
-                        {ok, Pid} when S#state.parent_pid /= self() ->
-                            unlink(Pid),
-                            {ok, Pid};
-                        Other ->
-                            Other
-                    end;
-                undefined ->
-                    case et_collector:start_link(CollectorOpt) of
-                        {ok, CollectorPid} ->
-                            S2 = S#state{collector_pid = CollectorPid},
-                            case gen_server:start_link(?MODULE, [S2], []) of
-                                {ok, Pid} when S#state.parent_pid /= self() ->
-                                    unlink(Pid),
-                                    {ok, Pid};
-                                Other ->
-                                    Other
-                            end;
-                        {error, Reason} ->
-                            {error, {et_collector, Reason}}
-                    end
-            end;
-        {error, Reason} ->
-            {error, Reason}
-    end.
-
-default_state() ->
-    #state{parent_pid     = self(),
-           collector_pid  = undefined,
-           detail_level   = ?detail_level_max,
-           active_filter  = collector,
-           filters        = [#filter{name = collector, function = fun(E) -> E end}],
-           event_order    = trace_ts,
-           is_suspended   = false,
-           max_events     = 100,
-           first_event    = first,
-           last_event     = first,
-           events         = queue_new(),
-           max_actors     = 5,
-           actors         = [create_actor(?unknown)],
-           selected_actor = ?unknown,
-           hide_actions   = false,
-           hide_unknown   = false,
-           refresh_needed = false,
-           display_mode   = all,
-           scale          = 2,
-           canvas_height  = 0,
-           canvas_width   = 0,
-           width          = 800,
-           height         = 600}.
-
-parse_opt([], S, CollectorOpt) ->
-    {ok, S, [{parent_pid, S#state.parent_pid} | CollectorOpt]};
-parse_opt([H | T], S, CollectorOpt) ->
-    case H of
-        {parent_pid, Parent} when Parent == undefined ->
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S#state{parent_pid = Parent}, CollectorOpt2);
-        {parent_pid, Parent} when pid(Parent) ->
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S#state{parent_pid = Parent}, CollectorOpt2);
-        {title, Title} ->
-            parse_opt(T, S#state{title = name_to_string(Title)}, CollectorOpt);
-        {detail_level, Level} when integer(Level),
-                                   Level >= ?detail_level_min,
-                                   Level =< ?detail_level_max -> 
-            parse_opt(T, S#state{detail_level = Level}, CollectorOpt);
-        {detail_level, max} ->
-            parse_opt(T, S#state{detail_level = ?detail_level_max}, CollectorOpt);
-        {detail_level, min} ->
-            parse_opt(T, S#state{detail_level = ?detail_level_min}, CollectorOpt);
-        {is_suspended, true} ->
-            parse_opt(T, S#state{is_suspended = true}, CollectorOpt);
-        {is_suspended, false} ->
-            parse_opt(T, S#state{is_suspended = false}, CollectorOpt);
-        {scale, Scale} when integer(Scale), Scale > 0 ->
-            parse_opt(T, S#state{scale = Scale}, CollectorOpt);
-        {width, W} when integer(W), W > 0 ->
-            parse_opt(T, S#state{width = W, canvas_width = W}, CollectorOpt);
-        {height, WH} when integer(WH), WH > 0 ->
-            parse_opt(T, S#state{height = WH, canvas_height = WH}, CollectorOpt);
-        {collector_pid, Pid} when pid(Pid) -> 
-            parse_opt(T, S#state{collector_pid = Pid}, CollectorOpt);
-        {collector_pid, undefined} -> 
-            parse_opt(T, S#state{collector_pid = undefined}, CollectorOpt);
-        {active_filter, Name} when atom(Name) ->
-            parse_opt(T, S#state{active_filter = Name}, CollectorOpt);
-        {event_order, trace_ts} -> %% BUGBUG: Verify event_order with collector
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S#state{event_order = trace_ts}, CollectorOpt2);
-        {event_order, event_ts} -> %% BUGBUG: Verify event_order with collector
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S#state{event_order = event_ts}, CollectorOpt2);
-        {trace_port, _Port} -> 
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {trace_max_queue, _Queue} -> 
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {trace_pattern, _Pattern} -> 
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {trace_global, _Boolean} -> 
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {trace_client, _Client} -> 
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {dict_insert, {filter, Name}, Fun} ->
-	    if
-		atom(Name), function(Fun) ->
-		    F = #filter{name = Name, function = Fun},
-		    Filters = lists:keydelete(Name, #filter.name, S#state.filters),
-		    CollectorOpt2 = [H | CollectorOpt],
-		    parse_opt(T, S#state{filters = Filters ++ [F]}, CollectorOpt2);
-		true ->
-	            {error, {bad_option, H}}
-	    end;
-        {dict_insert, {subscriber, Pid}, _Val} ->
-	    if
-		pid(Pid) ->
-		    CollectorOpt2 = [H | CollectorOpt],
-		    parse_opt(T, S, CollectorOpt2);
-		true ->
-	            {error, {bad_option, H}}
-	    end;
-        {dict_insert, _Key, _Val} ->
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {dict_delete, {filter, Name}} ->
-            Filters = lists:keydelete(Name, #filter.name, S#state.filters),
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S#state{filters = Filters}, CollectorOpt2);
-        {dict_delete, _Key} ->
-            CollectorOpt2 = [H | CollectorOpt],
-            parse_opt(T, S, CollectorOpt2);
-        {max_events, Max} when integer(Max), Max > 0->
-            parse_opt(T,  S#state{max_events = Max}, CollectorOpt);
-        {max_events, Max} when Max == infinity ->
-            parse_opt(T,  S#state{max_events = Max}, CollectorOpt);
-        {max_actors, Max} when integer(Max), Max >= 0->
-            parse_opt(T,  S#state{max_actors = Max}, CollectorOpt);
-        {max_actors, Max} when Max == infinity ->
-            parse_opt(T,  S#state{max_actors = Max}, CollectorOpt);
-        {actors, ActorNames} when list(ActorNames) ->
-            ActorNames2 = 
-                case lists:member(?unknown, ActorNames) of
-                    false -> [?unknown | ActorNames];
-                    true  -> ActorNames
-                end,
-            Actors = [create_actor(Name) || Name <- ActorNames2],
-            parse_opt(T, S#state{actors = Actors}, CollectorOpt);
-        {first_event, First} ->
-            parse_opt(T,  S#state{first_event = First}, CollectorOpt);
-        {hide_unknown, Bool} when Bool == false ->
-            parse_opt(T,  S#state{hide_unknown = Bool}, CollectorOpt);
-        {hide_unknown, Bool} when Bool == true ->
-            parse_opt(T,  S#state{hide_unknown = Bool}, CollectorOpt);
-        {hide_actions, Bool} when Bool == false ->
-            parse_opt(T,  S#state{hide_actions = Bool}, CollectorOpt);
-        {hide_actions, Bool} when Bool == true ->
-            parse_opt(T,  S#state{hide_actions = Bool}, CollectorOpt);
-        {display_mode, Mode = all} ->
-            parse_opt(T,  S#state{display_mode = Mode}, CollectorOpt);
-        {display_mode, Mode = {search_actors, Dir, _Key, Actors}} when list(Actors), Dir == forward ->
-            parse_opt(T,  S#state{display_mode = Mode}, CollectorOpt);
-        {display_mode, Mode = {search_actors, Dir, _Key, Actors}} when list(Actors), Dir == reverse ->
-            parse_opt(T,  S#state{display_mode = Mode}, CollectorOpt);
+start_link(GUI) when GUI =:= wx; GUI =:= gs; GUI =:= default ->
+    start_link([{trace_global, true}], GUI);
+start_link(Options) ->
+    start_link(Options, default).
 
-        Bad ->
-            {error, {bad_option, Bad}}
-    end;
-parse_opt(BadList, _S, _CollectorOpt) ->
-    {error, {bad_option_list, BadList}}.
+start_link(Options, GUI) -> 
+    case GUI of
+	wx ->
+	    et_wx_viewer:start_link(Options);
+	gs ->
+	    et_gs_viewer:start_link(Options);
+	default ->
+	    start_link(Options, which_gui())
+    end.
 
-do_dict_insert({filter, Name}, Fun, S) when atom(Name), function(Fun) ->
-    F = #filter{name = Name, function = Fun},
-    Filters = lists:keydelete(Name, #filter.name, S#state.filters),
-    Filters2 = lists:keysort(#filter.name, [F | Filters]),
-    gs:destroy(filter_menu),
-    create_filter_menu(S#state.active_filter, Filters2),    
-    S#state{filters = Filters2};
-do_dict_insert(_Key, _Val, S) ->
-    %% ok = error_logger:format("~p(~p): handle_info({et, {dict_insert, ~p, ~p}})~n",
-    %%                          [?MODULE, self(), Key, Val]),
-    S.
 
-do_dict_delete({filter, Name}, S) when atom(Name), Name /= S#state.active_filter ->
-    Filters = lists:keydelete(Name, #filter.name, S#state.filters),
-    gs:destroy(filter_menu),
-    create_filter_menu(S#state.active_filter, Filters),    
-    S#state{filters = Filters};
-do_dict_delete(_Key, S) ->
-    %% ok = error_logger:format("~p(~p): handle_info({et, {dict_delete, ~p}})~n",
-    %%                          [?MODULE, self(), Key]),
-    S.
+which_gui() ->
+    try
+	wx:new(),
+	wx:destroy(),
+	wx
+    catch _:_ ->
+	    gs
+    end.
 
-%%----------------------------------------------------------------------
-%% get_collector_pid(ViewerPid) -> CollectorPid
-%%
-%% Returns the identifier of the collector process
-%%
-%% ViewerPid = pid()
-%% CollectorPid = pid()
-%%----------------------------------------------------------------------
 
 get_collector_pid(ViewerPid) ->
     call(ViewerPid, get_collector_pid).
@@ -402,1201 +179,14 @@ get_collector_pid(ViewerPid) ->
 stop(ViewerPid) ->
     call(ViewerPid, stop).
 
-call(ViewerPid, Request) ->
-    gen_server:call(ViewerPid, Request, infinity).
-
-%%%----------------------------------------------------------------------
-%%% Callback functions from gen_server
-%%%----------------------------------------------------------------------
 
 %%----------------------------------------------------------------------
-%% Func: init/1
-%% Returns: {ok, State}          |
-%%          {ok, State, Timeout} |
-%%          ignore               |
-%%          {stop, Reason}
-%%----------------------------------------------------------------------
 
-init([S]) when record(S, state) ->
-    process_flag(trap_exit, true),
-    InitialTimeout = 0,
-    case S#state.parent_pid of
-	undefined ->
-	    ignore;
-	Pid when pid(Pid) ->
-	    link(Pid)
-    end,
-    et_collector:dict_insert(S#state.collector_pid,
-                             {subscriber, self()},
-                             ?MODULE),
-    {ok, create_main_window(S), InitialTimeout}.
+open_event(ViewerPid, N) ->
+    call(ViewerPid, {open_event, N}).
 
 %%----------------------------------------------------------------------
-%% Func: handle_call/3
-%% Returns: {reply, Reply, State}          |
-%%          {reply, Reply, State, Timeout} |
-%%          {noreply, State}               |
-%%          {noreply, State, Timeout}      |
-%%          {stop, Reason, Reply, State}   | (terminate/2 is called)
-%%          {stop, Reason, State}            (terminate/2 is called)
-%%----------------------------------------------------------------------
-
-handle_call(get_collector_pid, _From, S) ->
-    Reply = S#state.collector_pid,
-    reply(Reply, S);
-handle_call(stop, _From, S) ->
-    gs:destroy(S#state.win),
-    {stop, shutdown, ok, S};
-handle_call(Request, From, S) ->
-    ok = error_logger:format("~p(~p): handle_call(~p, ~p, ~p)~n",
-                             [?MODULE, self(), Request, From, S]),
-    Reply = {error, {bad_request, Request}},
-    reply(Reply, S).
-
-%%----------------------------------------------------------------------
-%% Func: handle_cast/2
-%% Returns: {noreply, State}          |
-%%          {noreply, State, Timeout} |
-%%          {stop, Reason, State}            (terminate/2 is called)
-%%----------------------------------------------------------------------
-
-handle_cast(Msg, S) ->
-    ok = error_logger:format("~p(~p): handle_cast(~p, ~p)~n",
-                             [?MODULE, self(), Msg, S]),
-    noreply(S).
-
-%%----------------------------------------------------------------------
-%% Func: handle_info/2
-%% Returns: {noreply, State}          |
-%%          {noreply, State, Timeout} |
-%%          {stop, Reason, State}            (terminate/2 is called)
-%%----------------------------------------------------------------------
-
-handle_info({et, {insert_actors, ActorNames}}, S) when list(ActorNames) ->
-    Fun = fun(N, Actors) ->
-                  case lists:keymember(N, #actor.name, Actors) of
-                      true  -> Actors;
-                      false -> Actors ++ [create_actor(N)]
-                  end
-          end,
-    Actors = lists:foldl(Fun, S#state.actors, ActorNames),
-    S2 = refresh_main_window(S#state{actors = Actors}),
-    noreply(S2);
-handle_info({et, {delete_actors, ActorNames}}, S) when list(ActorNames)->
-    Fun = fun(N, Actors) when N == ?unknown ->
-                  Actors;
-             (N, Actors) ->
-                  lists:keydelete(N, #actor.name, Actors)
-          end,
-    New = lists:foldl(Fun, S#state.actors, ActorNames),
-    S2 = refresh_main_window(S#state{actors = New}),
-    noreply(S2);
-handle_info({et, {dict_insert, Key, Val}}, S) ->
-    S2 = do_dict_insert(Key, Val, S),
-    noreply(S2);
-handle_info({et, {dict_delete, Key}}, S) ->
-    S2 = do_dict_delete(Key, S),
-    noreply(S2);
-handle_info({et, first}, S) ->
-    S2 = scroll_first(S),
-    noreply(S2);
-handle_info({et, prev}, S) ->
-    S2 = scroll_prev(S),
-    noreply(S2);
-handle_info({et, next}, S) ->
-    S2 = scroll_next(S),
-    noreply(S2);
-handle_info({et, last}, S) ->
-    S2 = scroll_last(S),
-    noreply(S2);
-handle_info({et, refresh}, S) ->
-    S2 = refresh_main_window(S),
-    noreply(S2);
-handle_info({et, {display_mode, Mode}}, S) ->
-    S2 = change_display_mode(Mode, S),
-    noreply(S2);
-handle_info({et, close}, S) ->
-    gs:destroy(S#state.win),
-    {stop, shutdown, S};
-handle_info({gs, Button, click, Data, Other} = Click, S) ->
-    CollectorPid = S#state.collector_pid,
-    case Button of
-        close ->
-            gs:destroy(S#state.win),
-            {stop, shutdown, S};
-        suspended ->
-            case Other of
-                [_Text, _Group, Bool | _] when Bool == true ->
-                    S2 = do_suspend(S),
-                    noreply(S2);    
-                [_Text, _Group, Bool | _] when Bool == false ->
-                    S2 = do_resume(S),
-                    noreply(S2);
-                _ ->
-                    click_error(Click, S),
-                    noreply(S)
-            end;
-        hide_actions ->
-            case Other of
-                [_Text, _Group, Bool | _] when Bool == true ->
-                    S2 = refresh_main_window(S#state{hide_actions = Bool}),
-                    noreply(S2);    
-                [_Text, _Group, Bool | _] when Bool == false ->
-                    S2 = refresh_main_window(S#state{hide_actions = Bool}),
-                    noreply(S2);
-                _ -> 
-                    click_error(Click, S),
-                    noreply(S)
-            end;
-        hide_unknown ->
-            case Other of
-                [_Text, _Group, Bool | _] when Bool == true ->
-                    S2 = refresh_main_window(S#state{hide_unknown = Bool}),
-                    noreply(S2);    
-                [_Text, _Group, Bool | _] when Bool == false ->
-                    S2 = refresh_main_window(S#state{hide_unknown = Bool}),
-                    noreply(S2);
-                _ -> 
-                    click_error(Click, S),
-                    noreply(S)
-            end;
-        up ->
-            S2 = scroll_up(S),
-            noreply(S2);
-        down ->
-            S2 = scroll_down(S),
-            noreply(S2);
-        first ->
-            S2 = scroll_first(S),
-            noreply(S2);
-        prev ->
-            S2 = scroll_prev(S),
-            noreply(S2);
-        next ->
-            S2 = scroll_next(S),
-            noreply(S2);
-        last ->
-            S2 = scroll_last(S),
-            noreply(S2);
-        refresh ->
-            S2 = refresh_main_window(S),
-            noreply(S2);
-        {display_mode, Mode} ->
-            S2 = change_display_mode(Mode, S),
-            noreply(S2);
-        close_all ->
-            close_all(S);
-        close_all_others ->
-            close_all_others(S);
-        first_all ->
-            et_collector:multicast(CollectorPid, first),
-            noreply(S);
-        prev_all ->
-            et_collector:multicast(CollectorPid, prev),
-            noreply(S);
-        next_all ->
-            et_collector:multicast(CollectorPid, next),
-            noreply(S);
-        last_all ->
-            et_collector:multicast(CollectorPid, last),
-            noreply(S);
-        refresh_all ->
-            et_collector:multicast(CollectorPid, refresh),
-            noreply(S);
-        clear_all ->
-            et_collector:clear_table(CollectorPid),
-            et_collector:multicast(CollectorPid, refresh),
-            noreply(S);
-        load_all ->
-            et_collector:start_trace_client(CollectorPid, event_file, "et_viewer.log"),
-            noreply(S);
-        save_all ->
-            et_collector:save_event_file(CollectorPid,
-                                         "et_viewer.log",
-                                         [existing, write, keep]),
-            noreply(S);
-        {open_viewer, Scale} ->
-            Actors = [A#actor.name || A <- S#state.actors],
-            open_viewer(Scale, S#state.active_filter, Actors, S),
-            noreply(S);
-        _Level when Data == detail_level, integer(hd(Other)),
-                    hd(Other) >= ?detail_level_min,
-                    hd(Other) =< ?detail_level_max ->
-            S2 = S#state{detail_level = hd(Other)},
-            noreply(S2);
-        _PopupMenuItem when record(Data, filter) ->
-            open_viewer(S#state.scale, Data#filter.name, [?unknown], S),
-            noreply(S);
-        _ ->
-            click_error(Click, S),
-            noreply(S)
-    end;
-handle_info({gs, _Obj, destroy,_, _}, S) ->
-    gs:destroy(S#state.win),
-    {stop, shutdown, S};
-handle_info({gs, _Obj, buttonpress, _, [_Button, X, Y | _]}, S) ->
-    S3 =
-        case y_to_n(Y, S) of
-            actor ->
-                %% Actor click
-                case S#state.actors of
-                    [] ->
-                        S;
-                    _ ->
-                        N = x_to_n(X, S),
-                        A = lists:nth(N, S#state.actors),
-                        S#state{selected_actor = A}
-                end;
-            {event, N} ->
-                %% Event click
-                List = queue_to_list(S#state.events),
-                S2 = S#state{events = list_to_queue(List)},
-                
-                Key = lists:nth(N, List),
-                Pid = S#state.collector_pid,
-                Fun = fun create_contents_window/2,
-		case et_collector:iterate(Pid, Key, -1) of
-		    Prev when Prev == Key ->
-			et_collector:iterate(Pid, first, 1, Fun, S2);
-		    Prev ->
-			et_collector:iterate(Pid, Prev, 1, Fun, S2)
-		end
-        end,
-    noreply(S3);
-handle_info({gs, _Obj, buttonrelease, _, [_Button, X, Y | _]}, S) ->
-    S2 =
-        case y_to_n(Y, S) of
-            actor ->
-                %% Actor click
-                case S#state.actors of
-                    [] ->
-                        S;
-                    Actors ->
-                        N = x_to_n(X, S),
-                        New = lists:nth(N, S#state.actors),
-                        Old = S#state.selected_actor,
-                        case New#actor.name == Old#actor.name of
-                            true ->
-                                A = S#state.selected_actor,
-                                toggle_search_for_actor(A#actor.name, S);
-                            false ->
-                                move_actor(Old, New, Actors, S)
-                        end
-                end;
-            {event, _N} ->
-                %% Event click ignored
-                S
-        end,
-    noreply(S2);
-handle_info({gs, _Obj, keypress, _, [KeySym, _Keycode, _Shift, _Control | _]} = Key, S) ->
-    case KeySym of
-        'c' ->
-            close_all_others(S);
-        'C' ->
-            close_all(S);
-        'Up' ->
-            S2 = scroll_up(S),
-            noreply(S2);
-        'Down' ->
-            S2 = scroll_down(S),
-            noreply(S2);
-        'f' ->
-            S2 = scroll_first(S),
-            noreply(S2);
-        'p' ->
-            S2 = scroll_prev(S),
-            noreply(S2);
-        'Prior' ->
-            S2 = scroll_prev(S),
-            noreply(S2);
-        'n' ->
-            S2 = scroll_next(S),
-            noreply(S2);
-        'Next' ->
-            S2 = scroll_next(S),
-            noreply(S2);
-        'l' ->
-            S2 = scroll_last(S),
-            noreply(S2);
-        'r' ->
-            S2 = refresh_main_window(S),
-            noreply(S2);
-        'F' ->
-            et_collector:multicast(S#state.collector_pid, first),
-            noreply(S);
-        'P' ->
-            et_collector:multicast(S#state.collector_pid, prev),
-            noreply(S);
-        'N' ->
-            et_collector:multicast(S#state.collector_pid, next),
-            noreply(S);
-        'L' ->
-            et_collector:multicast(S#state.collector_pid, last),
-            noreply(S);
-        'R' ->
-            et_collector:multicast(S#state.collector_pid, refresh),
-            noreply(S);
-
-        'a' ->
-            S2 = S#state{display_mode = all},
-            S3 = refresh_main_window(S2),
-            noreply(S3);
-
-        'equal' ->
-            Scale = S#state.scale,
-            Actors = [A#actor.name || A <- S#state.actors],
-            open_viewer(Scale, S#state.active_filter, Actors, S),
-            noreply(S);
-        'plus' ->
-            Scale = S#state.scale + 1,
-            Actors = [A#actor.name || A <- S#state.actors],
-            open_viewer(Scale, S#state.active_filter, Actors, S),
-            noreply(S);
-        'minus' ->
-            case S#state.scale of
-                1 ->
-                    gs:config(S#state.canvas, beep);
-                Scale ->
-                    Actors = [A#actor.name || A <- S#state.actors],
-                    open_viewer(Scale - 1, S#state.active_filter, Actors, S)
-            end,
-            noreply(S);
-        0 ->
-            case lists:keysearch(collector, #filter.name, S#state.filters) of
-                {value, F} when record(F, filter) ->
-                    open_viewer(S#state.scale, F#filter.name, [?unknown], S);
-                false ->
-                    gs:config(S#state.canvas, beep)
-            end,
-            noreply(S);
-        Int when integer(Int), Int > 0, Int =< 9 ->
-            case catch lists:nth(Int, S#state.filters) of
-                F when record(F, filter) ->
-                    open_viewer(S#state.scale, F#filter.name, [?unknown], S);
-                {'EXIT', _} ->
-                    gs:config(S#state.canvas, beep)
-            end,
-            noreply(S);
-
-        'Shift_L' ->
-            noreply(S);
-        'Shift_R' ->
-            noreply(S);
-        'Caps_Lock' ->
-            noreply(S);
-            
-        _ ->
-            click_error(Key, S),
-            noreply(S)
-    end;
-handle_info({gs, _Obj,configure, [], [W, H | _]}, S) ->
-    gs:config(S#state.packer, [{width, W}, {height, H}]),
-    S2 = S#state{width = W, height = H},
-    noreply(S2);
-handle_info(timeout, S) ->
-    Try =
-        case S#state.display_mode of
-            {search_actors, reverse, _, _} ->
-                -10;
-            _ ->
-                10
-        end,
-    if
-        S#state.is_suspended == true ->
-            {noreply, S, infinity};
-        S#state.max_events == infinity ->
-            display_more_events(Try, S);
-        true ->
-            Needed = S#state.max_events - queue_length(S#state.events),
-            if
-                Needed =< 0  -> {noreply, S, infinity};
-                Needed > 10  -> display_more_events(Try, S);
-                Needed =< 10 -> display_more_events(Needed, S)
-            end
-    end;
-
-handle_info({'EXIT', Pid, Reason}, S) ->
-    if
-        Pid == S#state.collector_pid ->
-            unlink(Pid),
-            gs:destroy(S#state.win),
-            {stop, Reason, S};
-        Pid == S#state.parent_pid ->
-            unlink(Pid),
-            gs:destroy(S#state.win),
-            {stop, Reason, S};
-        true ->
-            noreply(S)
-    end;
-handle_info(Info, S) ->
-    ok = error_logger:format("~p(~p): handle_info(~p, ~p)~n",
-                             [?MODULE, self(), Info, S]),
-    noreply(S).
-
-%%----------------------------------------------------------------------
-%% Func: terminate/2
-%% Purpose: Shutdown the server
-%% Returns: any (ignored by gen_server)
-%%----------------------------------------------------------------------
-
-terminate(_Reason, _S) ->
-    ignore.
-
-%%----------------------------------------------------------------------
-%% Func: code_change/3
-%% Purpose: Convert process state when code is changed
-%% Returns: {ok, NewState}
-%%----------------------------------------------------------------------
-
-code_change(_OldVsn, S, _Extra) ->
-    {ok, S}.
-
-%%%----------------------------------------------------------------------
-%%% Handle suspend/resume
-%%%----------------------------------------------------------------------
-
-reply(Reply, S) ->
-    case queue_length(S#state.events) of
-        _ when S#state.is_suspended == true ->
-            {reply, Reply, S, infinity};
-        _ when S#state.max_events == infinity ->
-            {reply, Reply, S, 500};
-        N when N >= S#state.max_events ->
-            {reply, Reply, S, infinity};
-        _ ->
-            {reply, Reply, S, 0}
-    end.
-
-noreply(S) ->
-    case queue_length(S#state.events) of
-        _ when S#state.is_suspended == true ->
-            {noreply, S, infinity};
-        _ when S#state.max_events == infinity ->
-            {noreply, S, 500};
-        N when N >= S#state.max_events ->
-            {noreply, S, infinity};
-        _ ->
-            {noreply, S, 0}
-    end.
-
-do_suspend(S) ->
-    config_suspend(S#state{is_suspended = true}).
-
-do_resume(S) ->
-    config_suspend(S#state{is_suspended = false}).
-
-config_suspend(S) ->
-    Suspended = S#state.is_suspended,
-    gs:config(refresh,     [{enable, not Suspended}]),
-    gs:config(refresh_all, [{enable, not Suspended}]),
-    gs:config(clear_all,   [{enable, not Suspended}]),
-    S.
-
-refresh_main_window(S) ->
-    Pid = S#state.collector_pid,
-    Key = S#state.first_event,
-    case et_collector:iterate(Pid, Key, -1) of
-	Prev when Prev == Key ->
-	    scroll_first(S);
-	_Prev ->
-	    S2 = S#state{last_event = S#state.first_event},
-	    clear_canvas(S2)
-    end.    
-
-scroll_first(S) ->
-    S2 = S#state{first_event = first, last_event  = first},
-    clear_canvas(S2).
-
-scroll_prev(S) ->
-    Try =
-        case S#state.max_events of
-            infinity -> -10;
-            Max      -> -Max
-        end,
-    Key = et_collector:iterate(S#state.collector_pid, S#state.first_event, Try),
-    S2 = S#state{first_event = Key, last_event  = Key},
-    clear_canvas(S2).
-
-scroll_next(S) ->
-    S2 = S#state{first_event = S#state.last_event},
-    clear_canvas(S2).
-
-scroll_up(S) ->
-    Key = et_collector:iterate(S#state.collector_pid, S#state.first_event, -5),
-    S2 = S#state{first_event = Key, last_event  = Key},
-    clear_canvas(S2).
-
-scroll_down(S) ->
-    Key = et_collector:iterate(S#state.collector_pid, S#state.first_event, 5),
-    S2 = S#state{first_event = Key, last_event  = Key},
-    clear_canvas(S2).
-
-scroll_last(S) ->
-    S2 = S#state{first_event = last, last_event  = last},
-    clear_canvas(S2).
-
-change_display_mode(Mode, S) ->
-    case Mode of
-        all ->
-            S2 = S#state{display_mode = Mode},
-            refresh_main_window(S2);
-        {search_actors, _Dir, _Key, []}  ->
-            S2 = S#state{display_mode = all},
-            refresh_main_window(S2);
-        {search_actors, _Dir, Key, Actors} when list(Actors) ->
-            Pid = S#state.collector_pid,
-            Prev = et_collector:iterate(Pid, Key, -1),
-            S2 = S#state{first_event  = Prev,
-                         last_event   = Prev,
-                         display_mode = Mode},
-            clear_canvas(S2)
-    end.
-
-close_all(S) ->
-    et_collector:multicast(S#state.collector_pid, close),
-    timer:sleep(timer:seconds(1)),
-    spawn(et_collector, stop, [S#state.collector_pid]),
-    gs:destroy(S#state.win),
-    {stop, shutdown, S}.
-
-close_all_others(S) ->
-    Fun =
-        fun({{subscriber, Pid}, _}) ->
-                if
-                    Pid == self() ->
-                        ignore;
-                    true ->
-                        unlink(Pid),
-                        Pid ! {et, close}
-                end
-        end,
-    All = et_collector:dict_match(S#state.collector_pid,
-                                  {{subscriber, '_'}, '_'}),
-    lists:foreach(Fun, All),
-    noreply(S).
-
-click_error(Click, S) ->
-    gs:config(S#state.canvas, beep),
-    io:format("~p: ignored: ~p~n", [?MODULE, Click]).
-
-%%%----------------------------------------------------------------------
-%%% Clone viewer
-%%%----------------------------------------------------------------------
 
-open_viewer(Scale, FilterName, Actors, S) ->
-    Filters = [{dict_insert, {filter, F#filter.name}, F#filter.function}
-               || F <- S#state.filters],
-    Options = 
-        [{parent_pid,    S#state.parent_pid},
-         {title,         S#state.title},
-         {collector_pid, S#state.collector_pid},
-         {is_suspended,  S#state.is_suspended},
-         {detail_level,  S#state.detail_level},
-         {active_filter, FilterName},
-         {event_order,   S#state.event_order},
-         {first_event,   S#state.first_event},
-         {max_events,    S#state.max_events},
-         {max_actors,    S#state.max_actors},
-         {hide_actions,  S#state.hide_actions},
-         {hide_unknown,  S#state.hide_unknown},
-         {is_suspended,  S#state.is_suspended},
-         {actors,        Actors},
-         {scale,         Scale},
-         {width,         S#state.width},
-         {height,        S#state.height} | Filters],
-    case start_link(Options) of
-        {ok, ViewerPid} ->
-            unlink(ViewerPid),
-            ok;
-        {error, Reason} ->
-            ok = error_logger:format("~p: Failed to start a new window: ~p~n",
-                                     [?MODULE, Reason])
-    end.
-
-%%%----------------------------------------------------------------------
-%%% Handle graphics
-%%%----------------------------------------------------------------------
-
-create_main_window(S) ->
-    Font    = select_font(S#state.scale),
-    GS      = gs:start(),
-    Name    = name_to_string(S#state.active_filter),
-    Title   = case S#state.title of
-                  undefined -> atom_to_list(?MODULE);
-                  Explicit  -> name_to_string(Explicit)
-              end,
-    WinOpt  = [{title, Title ++ " (filter: " ++ Name ++  ")"},
-               {configure, true},
-               {width, S#state.width},
-               {height, S#state.height}],
-    Win     = gs:window(GS, WinOpt),
-    Bar     = gs:menubar(Win, []),
-
-    create_file_menu(Bar),
-    create_viewer_menu(Bar),
-    create_collector_menu(Bar),
-    gs:menubutton(filter_button, Bar, [{label, {text, "Filter"}}]),
-    create_filter_menu(S#state.active_filter, S#state.filters),
-    create_help_menu(Bar),
-   
-    config_suspend(S),
-
-    PackerOpt = [{packer_x, [{fixed, 5}, {fixed, 40}, {fixed, 40},
-                             {stretch, 1}, {fixed, 5}]},
-                 {packer_y, [{fixed, 30}, {fixed, 30},
-                             {stretch, 1}, {fixed, 30}]},
-                 {x, 0}, {y, 30}],
-    Packer = gs:frame(Win, PackerOpt),
-    gs:checkbutton(suspended, Packer, [{label,{text,"Freeze"}},
-                                       {x, 10}, {y, 0},
-                                       {width, 120}, {align, w},
-                                       {select, S#state.is_suspended}]),
-    gs:checkbutton(hide_actions, Packer, [{label,{text,"Hide From=To"}},
-                                          {x, 10}, {y, 20},
-                                          {width, 120}, {align, w},
-                                          {select, S#state.hide_actions}]),
-    gs:checkbutton(hide_unknown, Packer, [{label,{text,"Hide Unknown"}},
-                                          {x, 10}, {y, 40},
-                                          {width, 120}, {align, w},
-                                          {select, S#state.hide_unknown}]),
-    gs:scale(Packer, [{text,"Detail Level"},
-                      {range, {?detail_level_min, ?detail_level_max}},
-                      {orient, horizontal},
-                      {x, 150}, {y, 0}, {height, 65}, {width, 200},
-                      {pos, S#state.detail_level}, {data, detail_level}]),
-    CanvasW = calc_canvas_width(S),
-    CanvasH = calc_canvas_height(S),
-    CanOpt = [{pack_xy, {{2, 4}, 3}}, {vscroll, right}, {hscroll, bottom},
-              {scrollregion, {2, 2, CanvasW, CanvasH}}],
-    Canvas = gs:canvas(Packer, CanOpt),
-    gs:config(Canvas, [{buttonpress, true}, {buttonrelease, true}]),
-    gs:config(Packer, [{width, S#state.width}, {height, S#state.height}]),
-    gs:config(Win, [{map, true}, {keypress, true}]),
-    S2 = S#state{title = Title,
-                 win = Win, font = Font, packer = Packer,
-                 canvas_width = CanvasW, canvas_height = CanvasH,
-                 canvas = Canvas,
-                 y_pos = ?initial_y * S#state.scale},
-    draw_all_actors(S2).
-
-select_font(Scale) when integer(Scale) ->
-    case Scale of
-        1 -> {courier,  7};
-        2 -> {courier, 10};
-        3 -> {courier, 12};
-        4 -> {courier, 14};
-        S -> {courier, S * 4}
-    end.
-
-create_file_menu(Bar) ->
-    Button = gs:menubutton(Bar,  [{label, {text, "File"}}]),
-    Menu   = gs:menu(Button, []),
-    gs:menuitem(close_all, Menu,        [{label, {text, "Close Collector and all Viewers         (C) "}}]),
-    gs:menuitem(close_all_others, Menu, [{label, {text, "Close other Viewers, but keep Collector (c)"}}]),
-    gs:menuitem(close, Menu,            [{label, {text, "Close this  Viewer,  but keep Collector"}}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-
-    gs:menuitem(clear_all, Menu, [{label, {text, "Clear Collector"}}]),
-    gs:menuitem(load_all, Menu,  [{label, {text, "Load  Collector from the file \"et_viewer.log\""}}]),
-    gs:menuitem(save_all, Menu,  [{label, {text, "Save  Collector to   the file \"et_viewer.log\""}}]).
-
-create_viewer_menu(Bar) ->
-    Button = gs:menubutton(Bar,  [{label, {text, "Viewer"}}]),
-    Menu   = gs:menu(Button, []),
-    gs:menuitem(Menu, [{label, {text, "Scroll this Viewer"}}, {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(first, Menu,   [{label, {text, "First                     (f)"}}]),
-    gs:menuitem(prev, Menu,    [{label, {text, "Prev                      (p)"}}]),
-    gs:menuitem(next, Menu,    [{label, {text, "Next                      (n)"}}]),
-    gs:menuitem(last, Menu,    [{label, {text, "Last                      (l)"}}]),
-    gs:menuitem(refresh, Menu, [{label, {text, "Refresh                   (r)"}}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),                  
-    gs:menuitem(up,   Menu,    [{label, {text, "Up   5                    (Up)"}}]),
-    gs:menuitem(down, Menu,    [{label, {text, "Down 5                    (Down)"}}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(Menu, [{label, {text, "Search in this Viewer"}}, {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem({mode, all}, Menu,    [{label, {text, "Abort search. Display all (a)"}}]).
-
-create_collector_menu(Bar) ->
-    Button = gs:menubutton(Bar,  [{label, {text, "Collector"}}]),
-    Menu = gs:menu(Button, []),
-    gs:menuitem(Menu, [{label, {text, "Scroll all Viewers"}}, {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(first_all, Menu,   [{label, {text, "First   (F)"}}]),
-    gs:menuitem(prev_all, Menu,    [{label, {text, "Prev    (P)"}}]),
-    gs:menuitem(next_all, Menu,    [{label, {text, "Next    (N)"}}]),
-    gs:menuitem(last_all, Menu,    [{label, {text, "Last    (L)"}}]),
-    gs:menuitem(refresh_all, Menu, [{label, {text, "Refresh (R)"}}]).
-
-create_filter_menu(ActiveFilterName, Filters) ->
-    Menu = gs:menu(filter_menu, filter_button, []),
-    Item = fun(F, N) when F#filter.name == collector ->
-                   Label = lists:concat([pad_string(F#filter.name, 20), "(0)"]),
-                   gs:menuitem(Menu, [{label, {text, Label}}, {data, F}]),
-                   N + 1;
-              (F, N) ->
-                   Label = lists:concat([pad_string(F#filter.name, 20), "(", N, ")"]),
-                   gs:menuitem(Menu, [{label, {text, Label}}, {data, F}]),
-                   N + 1
-           end,
-    gs:menuitem(Menu, [{label, {text, "Same Filter New Scale"}}, {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    {value, Filter} = lists:keysearch(ActiveFilterName, #filter.name, Filters),
-    Same    = lists:concat([pad_string(ActiveFilterName, 20), "(=)"]),
-    Larger  = lists:concat([pad_string(ActiveFilterName, 20), "(+)"]),
-    Smaller = lists:concat([pad_string(ActiveFilterName, 20), "(-)"]),
-    gs:menuitem(Menu, [{label, {text, Same}}, {data, Filter}]),
-    gs:menuitem(Menu, [{label, {text, Smaller}}, {data, Filter}]),
-    gs:menuitem(Menu, [{label, {text, Larger}}, {data, Filter}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(Menu, [{label, {text, "New Filter Same Scale"}}, {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    lists:foldl(Item, 1, Filters).
-
-create_help_menu(Bar) ->
-    Button = gs:menubutton(Bar,  [{label, {text, "Help"}}]),
-    Menu = gs:menu(Button, []),
-    gs:menuitem(Menu, [{label, {text, "Display details of an event"}},
-                       {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{label, {text, "    Single click on the name tag or the arrow (Mouse-1)"}},
-                       {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(Menu, [{label, {text, "Toggle actor search"}},
-                       {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{label, {text, "    Single click on the name tag (Mouse-1)"}},
-                       {enable,false}]),
-    gs:menuitem(Menu, [{itemtype, separator}]),
-    gs:menuitem(Menu, [{label, {text, "Move actor"}},
-                       {bg, lightblue}, {enable,false}]),
-    gs:menuitem(Menu, [{label, {text, "    se drag and drop on name tag (Mouse-1)"}},
-                       {enable,false}]).
-
-clear_canvas(S) ->
-    gs:destroy(S#state.canvas),
-    CanvasW = calc_canvas_width(S),
-    CanvasH = calc_canvas_height(S),
-    CanOpt = [{pack_xy, {{2, 4}, 3}}, {vscroll, right}, {hscroll, bottom},
-              {scrollregion, {2, 2, CanvasW, CanvasH}}],
-    Canvas = gs:canvas(S#state.packer, CanOpt),
-    gs:config(S#state.packer, [{width, S#state.width}, {height, S#state.height}]), 
-    gs:config(Canvas, [{buttonpress, true}, {buttonrelease, true}]),
-    S2 = S#state{refresh_needed = false,
-                 y_pos          = ?initial_y * S#state.scale,
-                 canvas         = Canvas,
-                 canvas_width   = CanvasW, 
-                 canvas_height  = CanvasH,
-                 events         = queue_new()},
-    draw_all_actors(S2).
-
-calc_canvas_width(S) ->
-    Min = calc_min_actors(S),
-    CanvasW = ((2 * ?initial_x) + (Min * ?incr_x)) * S#state.scale,
-    lists:max([CanvasW, S#state.width - (15 * S#state.scale), S#state.canvas_width]).
-
-calc_canvas_height(S) ->
-    Min = calc_min_events(S),
-    CanvasH = ((2 * ?initial_y) + (Min * ?incr_y)) * S#state.scale,
-    lists:max([CanvasH, S#state.height - (4 * 30), S#state.canvas_height]).
-
-calc_min_actors(S) ->
-    Max = S#state.max_actors,
-    N   = length(S#state.actors),
-    if
-        Max == infinity ->
-            N * 2;
-        Max < N ->
-            N;
-        true ->
-            Max
-    end.
-    
-calc_min_events(S) ->
-    Max = S#state.max_events,
-    N   = queue_length(S#state.events),
-    if
-        Max == infinity ->
-            N * 2;
-        Max < N ->
-            N;
-        true ->
-            Max
-    end.
-
-display_more_events(Try, S) ->
-    Name = S#state.active_filter,
-    {value, F} = lists:keysearch(Name, #filter.name, S#state.filters),
-    FilterFun = F#filter.function,
-    Fun = fun(Event, State) ->
-              case catch FilterFun(Event) of
-                  true ->
-                      State2 = ensure_key(Event, State),
-                      opt_display_event(Event, State2);
-                  {true, Event2} -> 
-                      State2 = ensure_key(Event2, State),
-                      opt_display_event(Event2, State2);
-                  false ->
-                      ensure_key(Event, State);
-                  Bad ->
-                      Contents = {bad_filter, Name, Bad, Event},
-                      Event2 = Event#event{contents = Contents,
-                                           from     = bad_filter,
-                                           to       = bad_filter},
-                      State2 = ensure_key(Event2, State),
-                      opt_display_event(Event2, State2)
-              end
-          end,
-    Pid = S#state.collector_pid,
-    S2 = et_collector:iterate(Pid, S#state.last_event, Try, Fun, S),
-    case queue_length(S2#state.events) - queue_length(S#state.events) of
-        Diff when Diff == Try ->
-            %% Got as much as requested, look for more
-            %% io:format("Done: ~p~n", [{Try, Diff}]),
-            {noreply, S2, 0};
-        _Diff when S2#state.first_event == S#state.first_event,
-                  S2#state.last_event  == S#state.last_event ->
-            %% Got lesser than requested, wait a while before looking for more
-            %% io:format("More: ~p~n", [{Try, Diff}]),
-            {noreply, S2, 500};
-        _Diff ->
-            %% Got lesser than requested, look for more
-            %% io:format("More2: ~p~n", [{Try, Diff}]),
-            {noreply, S2, 0}
-    end.
-
-ensure_key(E, S) when record(E, event), record(S, state)  ->
-    Key  = et_collector:make_key(S#state.event_order, E),
-    case S#state.first_event of
-             first ->
-                 S#state{first_event = Key, last_event = Key};
-             last ->
-                 S#state{first_event = Key, last_event = Key};
-             _     -> 
-                 S#state{last_event = Key}
-    end.
-
-opt_display_event(E, S) ->
-    case S#state.display_mode of
-        all ->
-            display_event(E, S);
-        {search_actors, _Dir, _FirstKey, Actors} ->
-            %% Key = S#state.last_event,
-            From = select_actor_name(E#event.from, S),
-            case lists:member(From, Actors) of
-                true ->
-                    display_event(E, S);
-                false ->
-                    To = select_actor_name(E#event.to, S),
-                    case lists:member(To, Actors) of
-                        true ->
-                            display_event(E, S);
-                        false ->
-                            S
-                    end
-            end
-    end.
-
-select_actor_name(Name, S) ->
-    case lists:keymember(Name, #actor.name, S#state.actors) of
-        true  ->  Name;
-        false ->  ?unknown
-    end.
-
-display_event(E, S) when E#event.detail_level < S#state.detail_level ->
-    {FromRefresh, From} = ensure_actor(E#event.from, S),
-    {FromName, FromPos, S2} = From,
-    {ToRefresh, To} = ensure_actor(E#event.to, S2),
-    {ToName, ToPos, S3} = To,
-    if
-        FromRefresh /= false, ToRefresh /= false ->
-            Key = S#state.last_event,
-            refresh_beep(S),
-            S3#state{refresh_needed = true,
-                     events = queue_in(Key, S3#state.events)};
-        FromName == ToName ->
-            case S#state.hide_actions of
-                true  -> 
-                    S3;
-                false -> 
-                    Label = name_to_string(E#event.label),
-                    draw_named_arrow(Label, FromName, FromPos, ToName, ToPos, S3)
-            end;
-        true ->
-            Label = name_to_string(E#event.label),
-            draw_named_arrow(Label, FromName, FromPos, ToName, ToPos, S3)
-    end;
-display_event(_, S) ->
-    S.
-
-draw_named_arrow(Label, FromName, FromPos, ToName, ToPos, S) ->
-    Key = S#state.last_event,
-    case S#state.y_pos + (?incr_y *  S#state.scale) of
-        _ when S#state.hide_unknown == true, FromName == ?unknown ->
-            S;
-        _ when S#state.hide_unknown == true, ToName == ?unknown ->
-            S;
-        Y when  Y > S#state.canvas_height ->
-            refresh_beep(S),
-            S#state{refresh_needed = true,
-                    events = queue_in(Key, S#state.events)};
-        Y ->
-            S2 = S#state{y_pos  = Y, events = queue_in(Key, S#state.events)},
-            S3 = draw_arrow(FromPos, ToPos, S2),
-            draw_label(Label, FromName, ToName, FromPos, ToPos, S3)
-    end.
-
-refresh_beep(S) ->
-    case S#state.refresh_needed of
-        false  -> 
-            gs:config(S#state.canvas, beep),
-            gs:config(S#state.canvas, beep),
-            gs:config(S#state.canvas, beep);
-        true -> 
-            ignore
-    end.
-
-draw_arrow(Pos, Pos, S) ->
-    S;
-draw_arrow(FromPos, ToPos, S) ->
-    Y = S#state.y_pos,
-    CanOpts = [{coords, [{FromPos , Y}, {ToPos, Y}]},
-               {arrow, last},{width, 1}, {fg, black}],
-    gs:line(S#state.canvas, CanOpts),
-    S.
-
-draw_label(Label, FromName, ToName, FromPos, ToPos, S) ->
-    Colour =
-        if
-            FromName == ?unknown, 
-            ToName   == ?unknown -> blue; %turquoise;
-            FromName == ?unknown -> orange;
-            ToName   == ?unknown -> orange;
-            FromPos  == ToPos    -> blue;
-            true                 -> red
-        end,
-    Scale = S#state.scale,
-    X = lists:min([FromPos, ToPos]) + (6 * Scale),
-    Y = S#state.y_pos,
-    write_text(Label, X, Y, Colour, S),
-    S.
-
-draw_all_actors(State) ->
-    Scale = State#state.scale,
-    Fun = fun(A, X) ->
-                  draw_actor(A, X, State),
-                  X + (?incr_x * Scale)
-          end,
-    lists:foldl(Fun, ?initial_x * Scale, State#state.actors),
-    State.
-
-%% Returns: {NeedsRefreshBool, {ActorPos, NewsS, NewActors}}
-ensure_actor(Name, S) ->
-    do_ensure_actor(Name, S, S#state.actors, 0).
-
-do_ensure_actor(Name, S, [H | _], N) when H#actor.name == Name ->
-    Pos = (?initial_x + (N * ?incr_x)) * S#state.scale,
-    {false, {Name, Pos, S}};
-do_ensure_actor(Name, S, [_ | T], N) ->
-    do_ensure_actor(Name, S, T, N + 1);
-do_ensure_actor(Name, S, [], N) ->
-    %% A brand new actor, let's see if it does fit
-    Pos = (?initial_x + (N * ?incr_x)) * S#state.scale,
-    MaxActors = S#state.max_actors,
-    if
-        integer(MaxActors), N > MaxActors ->
-            %% Failed on max_actors limit, put into unknown
-            %% Assume that unknown always is in actor list
-            ensure_actor(?unknown, S);
-        Pos > (S#state.canvas_width - ((?initial_x - 15) * S#state.scale)) ->
-            %% New actor does not fit in canvas, refresh needed
-            A = create_actor(Name),
-            draw_actor(A, Pos, S),
-            {true, {Name, Pos, S#state{actors = S#state.actors ++ [A]}}};
-        true ->
-            %% New actor fits in canvas. Draw the new actor.
-            A = create_actor(Name),
-            draw_actor(A, Pos, S),
-            {false, {Name, Pos, S#state{actors = S#state.actors ++ [A]}}}
-    end.
-
-draw_actor(A, LineX, S) ->
-    Scale    = S#state.scale,
-    TextX    = LineX - (5 * Scale),
-    TextY    = ?initial_y * Scale,
-    LineTopY = TextY + ((?incr_y  / 2) * Scale),
-    LineBotY = S#state.canvas_height - ((?incr_y / 2) * Scale),
-    Colour   = case A#actor.name of
-                   ?unknown -> orange;
-                   _        -> red
-               end,
-    write_text(A#actor.string, TextX, TextY, Colour, S),
-    LineOpt = [{coords, [{LineX, LineTopY}, {LineX, LineBotY}]},
-               {width, 1}, {fg, Colour}],
-    gs:line(S#state.canvas, LineOpt).
-
-toggle_search_for_actor(ActorName,S) ->    
-    case S#state.display_mode of
-        all ->
-            io:format("~p: search for: ~p ++ ~p~n", [?MODULE, [], [ActorName]]),
-            %% Search for this actor
-            Key = S#state.first_event,
-            Actors = [ActorName],
-            Mode = {search_actors, forward, Key, Actors},
-            change_display_mode(Mode, S);
-        {search_actors, Dir, Key, Actors}->
-            Actors2 = 
-                case lists:member(ActorName, Actors) of
-                    true ->
-                        io:format("~p: search for: ~p -- ~p~n", [?MODULE, Actors, [ActorName]]),
-                        %% Remove actor from search list
-                        Actors -- [ActorName];
-                    false ->
-                        io:format("~p: search for: ~p ++ ~p~n", [?MODULE, Actors, [ActorName]]),
-                        %% Add actor from search list
-                        [ActorName | Actors]
-                end,
-            Mode2 = {search_actors, Dir, Key, Actors2},
-            change_display_mode(Mode2, S)
-    end.
-
-move_actor(From, To, Actors, S) ->
-    Pos      = #actor.name,
-    ToName   = To#actor.name,
-    FromName = From#actor.name,
-    ToIx     = actor_index(ToName, Pos, Actors),
-    FromIx   = actor_index(FromName, Pos, Actors),
-    if
-        FromIx /= 0, ToIx /= 0, ToIx > FromIx ->
-            Actors2 = lists:keydelete(FromName, Pos, Actors),
-            Actors3 = insert_actor_after(From, To, Actors2),
-            S2 = S#state{actors = Actors3},
-            refresh_main_window(S2);
-        FromIx /= 0, ToIx /= 0 ->
-            Actors2 = lists:keydelete(FromName, Pos, Actors),
-            Actors3 = insert_actor_before(From, To, Actors2),
-            S2 = S#state{actors = Actors3},
-            refresh_main_window(S2);
-        true ->
-            %% Ignore
-            S
-    end.
-
-insert_actor_after(From, To, [H | T]) ->
-    case To#actor.name == H#actor.name of
-        true  -> [H, From | T];
-        false -> [H | insert_actor_after(From, To, T)]
-    end;
-insert_actor_after(_From, _To, []) ->
-    [].
-
-insert_actor_before(From, To, [H | T]) ->
-    case To#actor.name == H#actor.name of
-        true  -> [From, H | T];
-        false -> [H | insert_actor_before(From, To, T)]
-    end;
-insert_actor_before(_From, _To, []) ->
-    [].
-
-actor_index(_Key, _Pos, []) ->
-    0;
-actor_index(Key, Pos, [H | T]) ->
-    case Key == element(Pos, H) of
-        false -> actor_index(Key, Pos, T) + 1;
-        true  -> 1
-    end.
-
-y_to_n(Y, S) ->
-    Y2   = ((Y / S#state.scale) - ?initial_y + (?incr_y / 2)),
-    N    = round(Y2 / ?incr_y - 0.2),
-    MaxN = queue_length(S#state.events),
-    if
-        N =< 0   -> actor;
-        N > MaxN -> actor;
-        true     -> {event, N}
-    end.
-
-x_to_n(X, S) ->
-    Scale   = S#state.scale,
-    Len = length(S#state.actors),
-    X2 = X - (?initial_x * Scale),
-    N  = X2 / (?incr_x * Scale),
-    N2 = trunc(N + 1.5),
-    if
-        N2 > Len -> Len;
-        N2 < 1   -> 1;
-        true     -> N2
-    end.
-
-write_text(Text, X, Y, Colour, S) ->
-    Opt = [{coords, [{X, Y - (?incr_y * S#state.scale / 2)}]},
-           {font, S#state.font}, {fg, Colour}, {text, Text}],
-    gs:text(S#state.canvas, Opt).
-
-create_contents_window(Event, S) ->
-    Options = [{viewer_pid, self()},
-               {event, Event},
-               {event_order, S#state.event_order},
-               {active_filter, S#state.active_filter}
-               | S#state.filters],
-    case et_contents_viewer:start_link(Options) of
-        {ok, _Pid} ->
-            S;
-        {error, Reason} ->
-            ok = error_logger:format("~p(~p): create_contents_window(~p) ->~n     ~p~n",
-                                     [?MODULE, self(), Options, Reason]),
-            S
-    end.
-
-%%%----------------------------------------------------------------------
-%%% String padding of actors
-%%%----------------------------------------------------------------------
-
-create_actor(Name) ->
-    String = name_to_string(Name),
-    PaddedString = pad_string(String, 8),
-    #actor{name = Name, string = PaddedString}.
-
-name_to_string(Name) ->
-    case catch io_lib:format("~s", [Name]) of
-        {'EXIT', _} -> lists:flatten(io_lib:format("~w", [Name]));
-        GoodString  -> lists:flatten(GoodString)
-    end.
-
-pad_string(Atom, MinLen) when atom(Atom) ->
-    pad_string(atom_to_list(Atom), MinLen);
-pad_string(String, MinLen) when integer(MinLen), MinLen >= 0 ->
-    Len = length(String),
-    case Len >= MinLen of
-        true ->
-            String;
-        false ->
-            String ++ lists:duplicate(MinLen - Len, $ )
-    end.
-
-%%%----------------------------------------------------------------------
-%%% Queue management
-%%%----------------------------------------------------------------------
-
-queue_new() ->
-    {0, [], []}.
-
-queue_in(X, {Size, In, Out}) ->
-    {Size + 1, [X | In], Out}.
-
-%% queue_out(Q) ->
-%%     case Q of
-%%         {Size, In, [H | Out]} -> {{value, H}, {Size - 1, In, Out}};
-%%         {Size, [], []}        -> {empty, {Size, [], []}};
-%%         {Size, In, _}         -> queue_out({Size, [], lists:reverse(In)})
-%%     end.
-
-queue_to_list({_Size, [], Out}) ->
-    Out;
-queue_to_list({_Size, In, Out}) ->
-    Out ++ lists:reverse(In).
-
-queue_length({Size, _In, _Out}) ->
-    Size.
+call(ViewerPid, Request) ->
+    gen_server:call(ViewerPid, Request, infinity).
 
-list_to_queue(List) when list(List) ->
-    {length(List), [], List}.