The R13B03 release.OTP_R13B03

1 files changed, 1597 insertions, 0 deletions

diff --git a/lib/debugger/src/dbg_ui_trace_win.erl b/lib/debugger/src/dbg_ui_trace_win.erl
new file mode 100644
index 0000000000..dbf93c7f45
--- /dev/null
+++ b/lib/debugger/src/dbg_ui_trace_win.erl
@@ -0,0 +1,1597 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1997-2009. 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%
+%%
+-module(dbg_ui_trace_win).
+
+%% External exports
+-export([init/0]).
+-export([create_win/4, get_window/1,
+	 configure/2,
+	 enable/2, is_enabled/1, select/2,
+	 add_break/3, update_break/2, delete_break/2,
+	 clear_breaks/1, clear_breaks/2,
+	 display/1,                                   % Help messages
+	 is_shown/2,                                  % Code area
+	 show_code/3, show_no_code/1, remove_code/2,      
+	 mark_line/3, unmark_line/1,
+	 select_line/2, selected_line/1,
+	 eval_output/2,                               % Evaluator area
+	 update_bindings/1,                           % Bindings area
+	 trace_output/1,                              % Trace area
+	 handle_event/2
+	]).
+-export([helpwin/4,                                   % Help windows
+	 helpwin/5]).
+
+-record(breakInfo, {point, status, break}).
+-record(winInfo, {window,          % gsobj()
+		  size,            % {W, H}
+		  flags,           % {F,F,F,F} F = open|close
+
+		  marked_line=0,   % integer() Current line
+		  selected_line=0, % integer() Selected line
+
+		  breaks=[],       % [#breakInfo{}] Known breakpoints
+
+		  editor,          % {Mod, Editor}  Visible code editor
+		  editors=[]       % [{Mod,Editor}] Code editors
+		 }).
+
+
+%%====================================================================
+%% External exports
+%%====================================================================
+
+%%--------------------------------------------------------------------
+%% init() -> GS
+%%   GS = term()
+%%--------------------------------------------------------------------
+init() ->
+    dbg_ui_win:init().
+
+%%--------------------------------------------------------------------
+%% create_win(GS, Title, TraceWin, Menus) -> #winInfo{}
+%%  GS = gsobj()
+%%  Title = string()
+%%  TraceWin = [WinArea]
+%%    WinArea = 'Button|Evaluator|Bindings|Trace Area'
+%%  Menus = [menu()]  See dbg_ui_win.erl
+%%--------------------------------------------------------------------
+create_win(GS, Title, TraceWin, Menus) ->
+    Bu = flip(lists:member('Button Area', TraceWin)),
+    Ev = flip(lists:member('Evaluator Area', TraceWin)),
+    Bi = flip(lists:member('Bindings Area', TraceWin)),
+    Tr = flip(lists:member('Trace Area', TraceWin)),
+    
+    Win = gs:window(trace_window, GS, [{title, Title},
+				       {width, 550},
+				       {configure,true}, {destroy,true},
+				       {keypress,true}, {motion,true}]),
+
+    MenuBar = gs:menubar(Win, []),
+    dbg_ui_win:create_menus(MenuBar, Menus),
+    dbg_ui_winman:windows_menu(MenuBar),
+
+    FrameOpts = [{anchor,nw}, {relief,raised}, {bw,2}, {keypress,true}],
+    Editor = code_area(2, 25, FrameOpts, Win),
+    button_area(Bu, 2, 235, FrameOpts, Win),
+    eval_area({Ev,Bi}, 2, 265, FrameOpts, Win),
+    bind_area({Ev,Bi}, 300, 265, FrameOpts, Win),
+    trace_area(Tr, 2, 475, FrameOpts, Win),
+
+    Flags = {Bu, Ev, Bi, Tr},
+    resizebar(rb1(Flags), 'RB1',   2, 225, 710,  10, Win),
+    resizebar(rb2(Flags), 'RB2',   2, 465, 710,  10, Win),
+    resizebar(rb3(Flags), 'RB3', 290, 265,  10, 200, Win),
+    config_v(),
+    config_h(),
+    
+    gs:config(Win,{height,
+		   25 +
+		   gs:read('CodeArea', height) +
+		   gs:read('RB1', height) +
+		   gs:read('ButtonArea', height) +
+		   max(gs:read('EvalArea', height),
+		       gs:read('BindArea', height)) +
+		   gs:read('RB2', height) +
+		   gs:read('TraceArea', height)}),
+    
+    gs:config(Win, {map, true}),
+    #winInfo{window=Win, size={gs:read(Win,width), gs:read(Win,height)},
+	     flags=Flags,
+	     editor={'$top', Editor}, editors=[{'$top', Editor}]}.
+
+flip(true) -> open;
+flip(false) -> close.
+    
+%%--------------------------------------------------------------------
+%% get_window(WinInfo) -> Window
+%%   WinInfo = #winInfo{}
+%%   Window = gsobj()
+%%--------------------------------------------------------------------
+get_window(WinInfo) ->
+    WinInfo#winInfo.window.
+
+%%--------------------------------------------------------------------
+%% configure(WinInfo, TraceWin) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%  TraceWin = [WinArea]
+%%    WinArea = 'Button|Evaluator|Bindings|Trace Area'
+%% Window areas should be opened or closed.
+%%--------------------------------------------------------------------
+configure(WinInfo, TraceWin) ->
+    {Bu1, Ev1, Bi1, Tr1} = OldFlags = WinInfo#winInfo.flags,
+    Bu2 = flip(lists:member('Button Area', TraceWin)),
+    Ev2 = flip(lists:member('Evaluator Area', TraceWin)),
+    Bi2 = flip(lists:member('Bindings Area', TraceWin)),
+    Tr2 = flip(lists:member('Trace Area', TraceWin)),
+    NewFlags = {Bu2, Ev2, Bi2, Tr2},
+
+    Win = WinInfo#winInfo.window,
+    W = gs:read(Win, width),
+    H = gs:read(Win, height),
+
+    H2 = if
+	     Bu1==close, Bu2==open ->
+		 resize_button_area(open, width, W-4),
+		 gs:config('ButtonArea', {height, 30}),
+		 H+30;
+	     Bu1==open, Bu2==close ->
+		 gs:config('ButtonArea', [{width, 0}, {height, 0}]),
+		 H-30;
+	     true -> H
+	 end,
+    H3 = if
+	     Ev1==close, Ev2==open, Bi1==open ->
+		 Wnew1 = round((W-10-4)/2), % W = window/2 - rb - pads
+		 Hbi1 = gs:read('BindArea', height), % H = bind area h
+		 resize_eval_area(open, width, Wnew1),
+		 resize_eval_area(open, height, Hbi1),
+		 gs:config('RB3', {width, 10}),
+		 gs:config('RB3', {height, Hbi1}),
+		 resize_bind_area(open, width,
+				  Wnew1-gs:read('BindArea', width)),
+		 H2;
+	     Ev1==close, Ev2==open, Bi1==close ->
+		 resize_eval_area(open, width, W-4),
+		 resize_eval_area(open, height, 200),
+		 H2+200;
+	     Ev1==open, Ev2==close, Bi1==open ->
+		 gs:config('EvalArea', [{width,0}, {height,0}]),
+		 gs:config('RB3', [{width, 0}, {height, 0}]),
+		 Wnew2 = W-4,
+		 resize_bind_area(open, width,
+				  Wnew2-gs:read('BindArea', width)),
+		 H2;
+	     Ev1==open, Ev2==close, Bi1==close ->
+		 Hs1 = gs:read('EvalArea', height),
+		 gs:config('EvalArea', [{width, 0}, {height, 0}]),
+		 H2-Hs1;
+	     true -> H2
+	 end,
+    H4 = if
+	     Bi1==close, Bi2==open, Ev2==open ->
+		 Wnew3 = round((W-10-4)/2), % W = window/2 - rb - pads
+		 Hs2 = gs:read('EvalArea', height), % H = eval area h
+		 resize_bind_area(open, width, Wnew3),
+		 resize_bind_area(open, height, Hs2),
+		 gs:config('RB3', [{width,10},{height,Hs2}]),
+		 resize_eval_area(open, width,
+				  Wnew3-gs:read('EvalArea', width)),
+		 H3;
+	     Bi1==close, Bi2==open, Ev2==close ->
+		 resize_bind_area(open, width, W-4),
+		 resize_bind_area(open, height, 200),
+		 H3+200;
+	     Bi1==open, Bi2==close, Ev2==open ->
+		 gs:config('BindArea', [{width, 0}, {height, 0}]),
+		 gs:config('RB3', [{width, 0}, {height, 0}]),
+		 Wnew4 = W-4,
+		 resize_eval_area(open, width,
+				  Wnew4-gs:read('EvalArea', width)),
+		 H3;
+	     Bi1==open, Bi2==close, Ev2==close ->
+		 Hbi2 = gs:read('BindArea', height),
+		 gs:config('BindArea', [{width, 0}, {height, 0}]),
+		 H3-Hbi2;
+	     true -> H3
+	 end,
+    H5 = if
+	     Tr1==close, Tr2==open ->
+		 resize_trace_area(open, width, W-4),
+		 resize_trace_area(open, height, 200),
+		 H4+200;
+	     Tr1==open, Tr2==close ->
+		 Hf = gs:read('TraceArea', height),
+		 gs:config('TraceArea', [{width, 0}, {height, 0}]),
+		 H4-Hf;
+	     true -> H4
+	 end,
+    gs:config(Win, {height, H5}),
+
+    RB1old = rb1(OldFlags), RB1new = rb1(NewFlags),
+    if
+	RB1old==close, RB1new==open ->
+	    gs:config('RB1', [{width, W-4}, {height, 10}]),
+	    gs:config(Win, {height, gs:read(Win, height)+10});
+	RB1old==open, RB1new==close ->
+	    gs:config('RB1', [{width, 0}, {height, 0}, lower]),
+	    gs:config(Win, {height, gs:read(Win, height)-10});
+	true -> ignore
+    end,
+
+    RB2old = rb2(OldFlags), RB2new = rb2(NewFlags),
+    if
+	RB2old==close, RB2new==open ->
+	    gs:config('RB2', [{width, W-4}, {height, 10}]),
+	    gs:config(Win, {height,gs:read(Win, height)+10});
+	RB2old==open, RB2new==close ->		
+	    gs:config('RB2', [{width, 0}, {height, 0}, lower]),
+	    gs:config(Win, {height, gs:read(Win, height)-10});
+	true -> ignore
+    end,
+    config_v(),
+    config_h(),
+
+    flush_configure(),
+    
+    WinInfo#winInfo{size={gs:read(Win, width), gs:read(Win, height)},
+		    flags=NewFlags}.
+
+flush_configure() ->
+    receive
+	{gs, _Id, configure, _Data, _Arg} ->
+	    flush_configure()
+    after 100 ->
+	    true
+    end.
+
+%%--------------------------------------------------------------------
+%% enable([MenuItem], Bool)
+%% is_enabled(MenuItem) -> Bool
+%%   MenuItem = atom()
+%%   Bool = boolean()
+%%--------------------------------------------------------------------
+enable(MenuItems, Bool) ->
+    lists:foreach(fun(MenuItem) ->
+			  gs:config(MenuItem, {enable, Bool}),
+			  case is_button(MenuItem) of
+			      {true, Button} ->
+				  gs:config(Button, {enable, Bool});
+			      false -> ignore
+			  end
+		  end,
+		  MenuItems).
+
+is_enabled(MenuItem) ->
+    gs:read(MenuItem, enable).
+
+%%--------------------------------------------------------------------
+%% select(MenuItem, Bool)
+%%   MenuItem = atom()
+%%   Bool = boolean()
+%%--------------------------------------------------------------------
+select(MenuItem, Bool) ->
+    dbg_ui_win:select(MenuItem, Bool).
+
+%%--------------------------------------------------------------------
+%% add_break(WinInfo, Name, {Point, Options}) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%   Name = atom() Menu name
+%%   Point = {Mod, Line}
+%%   Options = [Status, Action, Mods, Cond]
+%%     Status = active | inactive
+%%     Action = enable | disable | delete
+%%     Mods = null (not used)
+%%     Cond = null | {Mod, Func}
+%%--------------------------------------------------------------------
+add_break(WinInfo, Menu, {{Mod,Line},[Status|_Options]}=Break) ->
+    case lists:keysearch(Mod, 1, WinInfo#winInfo.editors) of
+	{value, {Mod, Editor}} ->
+	    add_break_to_code(Editor, Line, Status);
+	false -> ignore
+    end,
+    add_break_to_menu(WinInfo, Menu, Break).
+
+add_break_to_code(Editor, Line, Status) ->
+    Color = if Status==active -> red; Status==inactive -> blue end,
+    config_editor(Editor, [{overwrite,{{Line,0},"-@-  "}},
+			   {fg,{{{Line,0},{Line,lineend}}, Color}}]).
+
+add_break_to_menu(WinInfo, Menu, {Point, [Status|_Options]=Options}) ->
+    Break = dbg_ui_win:add_break(Menu, Point),
+    dbg_ui_win:update_break(Break, Options),
+    BreakInfo = #breakInfo{point=Point, status=Status, break=Break},
+    WinInfo#winInfo{breaks=[BreakInfo|WinInfo#winInfo.breaks]}.
+
+%%--------------------------------------------------------------------
+%% update_break(WinInfo, {Point, Options}) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%   Point = {Mod, Line}
+%%   Options = [Status, Action, Mods, Cond]
+%%     Status = active | inactive
+%%     Action = enable | disable | delete
+%%     Mods = null (not used)
+%%     Cond = null | {Mod, Func}
+%%--------------------------------------------------------------------
+update_break(WinInfo, {{Mod,Line},[Status|_Options]}=Break) ->
+    case lists:keysearch(Mod, 1, WinInfo#winInfo.editors) of
+	{value, {Mod, Editor}} ->
+	    add_break_to_code(Editor, Line, Status);
+	false -> ignore
+    end,
+    update_break_in_menu(WinInfo, Break).
+
+update_break_in_menu(WinInfo, {Point, [Status|_Options]=Options}) ->
+    {value, BreakInfo} = lists:keysearch(Point, #breakInfo.point,
+					 WinInfo#winInfo.breaks),
+    dbg_ui_win:update_break(BreakInfo#breakInfo.break, Options),
+    BreakInfo2 = BreakInfo#breakInfo{status=Status},
+    WinInfo#winInfo{breaks=lists:keyreplace(Point, #breakInfo.point,
+					    WinInfo#winInfo.breaks,
+					    BreakInfo2)}.
+
+%%--------------------------------------------------------------------
+%% delete_break(WinInfo, Point) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%   Point = {Mod, Line}
+%%--------------------------------------------------------------------
+delete_break(WinInfo, {Mod,Line}=Point) ->
+    case lists:keysearch(Mod, 1, WinInfo#winInfo.editors) of
+	{value, {Mod, Editor}} -> delete_break_from_code(Editor, Line);
+	false -> ignore
+    end,
+    delete_break_from_menu(WinInfo, Point).
+
+delete_break_from_code(Editor, Line) ->
+    Prefix = string:substr(integer_to_list(Line)++":   ", 1, 5),
+    config_editor(Editor, [{overwrite,{{Line,0},Prefix}},
+			   {fg,{{{Line,0},{Line,lineend}}, black}}]).
+
+delete_break_from_menu(WinInfo, Point) ->
+    {value, BreakInfo} = lists:keysearch(Point, #breakInfo.point,
+					 WinInfo#winInfo.breaks),
+    dbg_ui_win:delete_break(BreakInfo#breakInfo.break),
+    WinInfo#winInfo{breaks=lists:keydelete(Point, #breakInfo.point,
+					   WinInfo#winInfo.breaks)}.
+
+%%--------------------------------------------------------------------
+%% clear_breaks(WinInfo) -> WinInfo
+%% clear_breaks(WinInfo, Mod) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%--------------------------------------------------------------------
+clear_breaks(WinInfo) ->
+    clear_breaks(WinInfo, all).
+clear_breaks(WinInfo, Mod) ->
+    Remove = if
+		 Mod==all -> WinInfo#winInfo.breaks;
+		 true ->
+		     lists:filter(fun(#breakInfo{point={Mod2,_L}}) ->
+					  if
+					      Mod2==Mod -> true;
+					      true -> false
+					  end
+				  end,
+				  WinInfo#winInfo.breaks)
+	     end,
+    lists:foreach(fun(#breakInfo{point=Point}) ->
+			  delete_break(WinInfo, Point)
+		  end,
+		  Remove),
+    Remain = WinInfo#winInfo.breaks -- Remove,
+    WinInfo#winInfo{breaks=Remain}.
+
+%%--------------------------------------------------------------------
+%% display(Arg)
+%%   Arg = idle | {Status,Mod,Line} | {running,Mod}
+%%       � {exit,Where,Reason} | {text,Text}
+%%     Status = break | wait � Level
+%%       Level = int()
+%%     Mod = atom()
+%%     Line = integer()
+%%     Where = {Mod,Line} | null
+%%     Reason = term()
+%%     Text = string()
+%%--------------------------------------------------------------------
+display(Arg) ->
+    Str = case Arg of
+	      idle -> "State: uninterpreted";
+	      {exit, {Mod,Line}, Reason} ->
+		  gs:config(trace_window, raise),
+		  io_lib:format("State: EXITED [~w.erl/~w], Reason:~w",
+				[Mod, Line, Reason]);
+	      {exit, null, Reason} ->
+		  gs:config(trace_window, raise),
+		  io_lib:format("State: EXITED [uninterpreted], "
+				"Reason:~w", [Reason]);
+	      {Level, null, _Line} when is_integer(Level) ->
+		  io_lib:format("*** Call level #~w "
+				"(in non-interpreted code)",
+				[Level]);
+	      {Level, Mod, Line} when is_integer(Level) ->
+		  io_lib:format("*** Call level #~w [~w.erl/~w]",
+				[Level, Mod, Line]);
+	      {Status, Mod, Line} ->
+		  What = case Status of
+			     wait -> 'receive';
+			     _ -> Status
+			 end,
+		  io_lib:format("State: ~w [~w.erl/~w]",
+				[What, Mod, Line]);
+	      {running, Mod} ->
+		  io_lib:format("State: running [~w.erl]", [Mod]);
+	      {text, Text}  -> Text
+	  end,
+    gs:config(info_window, {label,{text,lists:flatten(Str)}}).
+
+%%--------------------------------------------------------------------
+%% is_shown(WinInfo, Mod) -> {true, WinInfo} | false
+%% show_code(WinInfo, Mod, Contents) -> WinInfo
+%% show_no_code(WinInfo) -> WinInfo
+%% remove_code(WinInfo, Mod) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%   Mod = atom()
+%%   Contents = string()
+%% Note: remove_code/2 should not be used for currently shown module.
+%%--------------------------------------------------------------------
+is_shown(WinInfo, Mod) ->
+    case lists:keysearch(Mod, 1, WinInfo#winInfo.editors) of
+	{value, {Mod, Editor}} ->
+	    gs:config(Editor, raise),
+	    {true, WinInfo#winInfo{editor={Mod, Editor}}};
+	false -> false
+    end.
+
+show_code(WinInfo, Mod, Contents) ->
+    Editors = WinInfo#winInfo.editors,
+    {Flag, Editor} = case lists:keysearch(Mod, 1, Editors) of
+			 {value, {Mod, Ed}} -> {existing, Ed};
+			 false -> {new, code_editor()}
+		     end,
+
+    %% Insert code and update breakpoints, if any
+    config_editor(Editor, [raise, clear]),
+    show_code(Editor, Contents),
+    lists:foreach(fun(BreakInfo) ->
+			  case BreakInfo#breakInfo.point of
+			      {Mod2, Line} when Mod2==Mod ->
+				  Status = BreakInfo#breakInfo.status,
+				  add_break_to_code(Editor, Line,Status);
+			      _Point -> ignore
+			  end
+		  end,
+		  WinInfo#winInfo.breaks),
+
+    case Flag of
+	existing ->
+	    WinInfo#winInfo{editor={Mod, Editor}};
+	new ->
+	    WinInfo#winInfo{editor={Mod, Editor},
+			    editors=[{Mod, Editor} | Editors]}
+    end.
+	
+show_code(Editor, Text) when length(Text)>1500 ->
+    %% Add some text at a time so that other processes may get scheduled
+    Str = string:sub_string(Text, 1, 1500),
+    config_editor(Editor, {insert,{'end', Str}}),
+    show_code(Editor, string:sub_string(Text, 1501));
+show_code(Editor, Text) ->
+    config_editor(Editor, {insert,{'end',Text}}).
+
+show_no_code(WinInfo) ->
+    {value, {'$top', Editor}} =
+	lists:keysearch('$top', 1, WinInfo#winInfo.editors),
+    gs:config(Editor, raise),
+    WinInfo#winInfo{editor={'$top', Editor}}.
+
+remove_code(WinInfo, Mod) ->
+    Editors = WinInfo#winInfo.editors,
+    case lists:keysearch(Mod, 1, Editors) of
+	{value, {Mod, Editor}} ->
+	    gs:destroy(Editor),
+	    WinInfo#winInfo{editors=lists:keydelete(Mod, 1, Editors)};
+	false ->
+	    WinInfo
+    end.
+    
+
+%%--------------------------------------------------------------------
+%% mark_line(WinInfo, Line, How) -> WinInfo
+%%   WinInfo = #winInfo{}
+%%   Line = integer()
+%%   How = break | where
+%% Mark the code line where the process is executing.
+%%--------------------------------------------------------------------
+mark_line(WinInfo, Line, How) ->
+    {_Mod, Editor} = WinInfo#winInfo.editor,
+    mark_line2(Editor, WinInfo#winInfo.marked_line, false),
+    mark_line2(Editor, Line, How),
+    if
+	Line/=0 -> config_editor(Editor, {vscrollpos, Line-5});
+	true -> ignore
+    end,
+    WinInfo#winInfo{marked_line=Line}.
+
+unmark_line(WinInfo) ->
+    mark_line(WinInfo, 0, false).
+
+mark_line2(Editor, Line, How) ->
+    Prefix = case How of
+		 break -> "-->";
+		 where -> ">>>";
+		 false -> "   "
+	     end,
+    Font = if
+	       How==false -> dbg_ui_win:font(normal);
+	       true -> dbg_ui_win:font(bold)
+	   end,
+    config_editor(Editor, [{overwrite, {{Line,5}, Prefix}},
+			   {font_style,
+			    {{{Line,0},{Line,lineend}}, Font}}]).
+
+%%--------------------------------------------------------------------
+%% select_line(WinInfo, Line) -> WinInfo
+%% selected_line(WinInfo) -> undefined | Line
+%%   WinInfo = #winInfo{}
+%%   Line = integer()
+%% Select/unselect a line (unselect if Line=0).
+%%--------------------------------------------------------------------
+select_line(WinInfo, Line) ->
+    {_Mod, Editor} = WinInfo#winInfo.editor,
+
+    %% Since 'Line' may be specified by the user in the 'Go To Line'
+    %% help window, it must be checked that it is correct
+    Size = gs:read(Editor, size),
+    if
+	Line==0 ->
+	    select_line(Editor, WinInfo#winInfo.selected_line, false),
+	    WinInfo#winInfo{selected_line=0};
+	Line<Size ->
+	    select_line(Editor, Line, true),
+	    config_editor(Editor, {vscrollpos, Line-5}),
+	    WinInfo#winInfo{selected_line=Line};
+	true ->
+	    WinInfo
+    end.
+
+select_line(Editor, Line, true) ->
+    config_editor(Editor, {selection, {{Line,0}, {Line,lineend}}});
+select_line(Editor, _Line, false) ->
+    config_editor(Editor, {selection, {{1,0}, {1,0}}}).
+
+selected_line(WinInfo) ->
+    case WinInfo#winInfo.selected_line of
+	0 -> undefined;
+	Line -> Line
+    end.
+
+%%--------------------------------------------------------------------
+%% eval_output(Str, Face)
+%%   Str = string()
+%%   Face = normal | bold
+%%--------------------------------------------------------------------
+eval_output(Text, Face) ->
+    Y1 = gs:read('EvalEditor', size),
+    config_editor('EvalEditor', {insert,{'end',Text}}),
+    Y2 = gs:read('EvalEditor', size),
+
+    Font = dbg_ui_win:font(Face),
+    config_editor('EvalEditor',
+		  [{font_style, {{{Y1,0},{Y2,lineend}}, Font}},
+		   {vscrollpos,Y2}]).
+
+%%--------------------------------------------------------------------
+%% update_bindings(Bs)
+%%   Bs = [{Var,Val}]
+%%--------------------------------------------------------------------
+update_bindings(Bs) ->
+    gs:config('BindGrid', {rows, {1,length(Bs)+1}}),
+    Font = dbg_ui_win:font(normal),
+    Last =
+	lists:foldl(fun({Var, Val}, Row) ->
+			    Opts = [{text, {1,atom_to_list(Var)}},
+				    {text, {2,io_lib:format("~P",
+							    [Val, 4])}},
+				    {doubleclick, true},
+				    {data, {binding,{Var,Val}}}],
+			    case gs:read('BindGrid',{obj_at_row,Row}) of
+				undefined ->
+				    gs:gridline('BindGrid',
+						[{row, Row},
+						 {height, 14},
+						 {font, Font} | Opts]);
+				GridLine ->
+				    gs:config(GridLine, Opts)
+			    end,
+			    Row+1
+		    end,
+		    2,
+		    Bs),
+    delete_gridlines(Last).
+
+delete_gridlines(Row) -> 
+    case gs:read('BindGrid', {obj_at_row, Row}) of
+	undefined -> true;
+	GridLine ->
+	    gs:destroy(GridLine),
+	    delete_gridlines(Row+1)
+    end.
+
+%%--------------------------------------------------------------------
+%% trace_output(Str)
+%%   Str = string()
+%%--------------------------------------------------------------------
+trace_output(Str) ->
+    Font = dbg_ui_win:font(normal),
+    config_editor('TraceEditor',
+		  [{insert, {'end',Str}},
+		   {fg, {{{1,0},'end'},black}},
+		   {font_style, {{{1,0},'end'},Font}}]),
+    Max = gs:read('TraceEditor', size),
+    config_editor('TraceEditor', {vscrollpos, Max}).
+    
+%%--------------------------------------------------------------------
+%% handle_event(GSEvent, WinInfo) -> Command
+%%   GSEvent = {gs, Id, Event, Data, Arg}
+%%   WinInfo = #winInfo{}
+%%   Command = ignore
+%%           | {win, WinInfo}
+%%           | stopped
+%%           | {coords, {X,Y}}
+%%
+%%           | {shortcut, Key}
+%%           | MenuItem | {Menu, [MenuItem]}
+%%               MenuItem = Menu = atom()
+%%           | {break, Point, What}
+%%               What = add | delete | {status,Status} |{trigger,Trigger}
+%%           | {module, Mod, view}
+%%
+%%           | {user_command, Cmd}
+%%
+%%           | {edit, {Var, Val}}
+%%--------------------------------------------------------------------
+%% Window events
+handle_event({gs, _Id, configure, _Data, [W, H|_]}, WinInfo) ->
+    case WinInfo#winInfo.size of
+	{W, H} -> ignore;
+	_Size ->
+	    configure(WinInfo, W, H),
+	    {win, WinInfo#winInfo{size={W, H}}}
+    end;
+handle_event({gs, _Id, destroy, _Data, _Arg}, _WinInfo) ->
+    stopped;
+handle_event({gs, _Id, motion, _Data, [X,Y]}, WinInfo) ->
+    {LastX, LastY} = dbg_ui_win:motion(X, Y),
+    Win = WinInfo#winInfo.window,
+    {coords, {gs:read(Win, x)+LastX-5, gs:read(Win, y)+LastY-5}};
+handle_event({gs, RB, buttonpress, resizebar, _Arg}, WinInfo) ->
+    resize(WinInfo, RB), % Resize window contents
+    ignore;
+
+%% Menus, buttons and keyboard shortcuts
+handle_event({gs, _Id, keypress, _Data, [Key,_,_,1]}, _WinInfo) ->
+    {shortcut, Key};
+handle_event({gs, _Id, click, {dbg_ui_winman, Win}, _Arg}, _WinInfo) ->
+    dbg_ui_winman:raise(Win),
+    ignore;
+handle_event({gs, _Id, click, {menuitem, Name}, _Arg}, _WinInfo) ->
+    Name;
+handle_event({gs, _Id, click, {menu, Menu}, _Arg}, _WinInfo) ->
+    Names = dbg_ui_win:selected(Menu),
+    {Menu, Names};
+handle_event({gs, _Id, click, {break, Point, What}, _Arg}, _WinInfo) ->
+    {break, Point, What};
+handle_event({gs, _Id, click, {module, Mod, view}, _Arg}, _WinInfo) ->
+    {module, Mod, view};
+
+%% Code area
+handle_event({gs, Editor, buttonpress, code_editor, _Arg}, WinInfo) ->
+    {Row, _Col} = gs:read(Editor, insertpos),
+    Again = receive
+		{gs, Editor, buttonpress, code_editor, _} ->
+		    gs:read(Editor, insertpos)
+	    after 500 ->
+		    false
+	    end,
+    case Again of
+	{Row, _} ->
+	    {Mod, _Editor} = WinInfo#winInfo.editor,
+	    Point = {Mod, Row},
+	    case lists:keysearch(Point, #breakInfo.point,
+				 WinInfo#winInfo.breaks) of
+		{value, _BreakInfo} -> {break, Point, delete};
+		false -> {break, Point, add}
+	    end;
+	{Row2, _} ->
+	    select_line(Editor, Row2, true),
+	    {win, WinInfo#winInfo{selected_line=Row2}};
+	false ->
+	    select_line(Editor, Row, true),
+	    {win, WinInfo#winInfo{selected_line=Row}}
+    end;
+
+%% Button area
+handle_event({gs, _Id, click, {button, Name}, _Arg}, _WinInfo) ->
+    Name;
+
+%% Evaluator area
+handle_event({gs, 'EvalEntry', keypress, _Data, ['Return'|_]}, _WI) ->
+    Command = case gs:read('EvalEntry', text) of
+		  [10] ->
+		      eval_output("\n", normal),
+		      ignore;
+		  Cmd ->
+		      eval_output([$>, Cmd, 10], normal),
+		      {user_command, Cmd}
+	      end,
+    gs:config('EvalEntry', [{text,""}, {focus,false}]),
+    Command;
+
+%% Bindings area
+handle_event({gs, _Id, click, {binding, {Var, Val}}, _Arg}, _WinInfo) ->
+    Str = io_lib:format("< ~p = ~p~n", [Var, Val]),
+    eval_output(Str, bold),
+    ignore;
+handle_event({gs, _Id, doubleclick, {binding, B}, _Arg}, _WinInfo) ->
+    {edit, B};
+
+handle_event(_GSEvent, _WinInfo) ->
+    ignore.
+
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
+
+%%--Code Area---------------------------------------------------------
+
+code_area(X, Y, FrameOpts, Win) ->
+    gs:frame('CodeArea', Win,
+	     [{x,X}, {y,Y}, {width,546}, {height,400} | FrameOpts]),
+    gs:label(info_window, 'CodeArea',
+	     [{label,{text,""}}, {font,dbg_ui_win:font(normal)},
+	      {x,5}, {y,10}, {width,406}, {height,15},
+	      {anchor,nw}, {align,w}]),
+    code_editor('CodeEditor', 536, 365).
+
+code_editor() ->
+    W = gs:read('CodeEditor', width),
+    H = gs:read('CodeEditor', height),
+    code_editor(null, W, H).
+
+code_editor(Name, W, H) ->
+    Editor = if
+		 Name==null -> gs:editor('CodeArea', []);
+		 true -> gs:editor(Name, 'CodeArea', [])
+	     end,
+    gs:config(Editor, [{x,5}, {y,30}, {width,W}, {height,H},
+		       {keypress,false}, {buttonpress,true}, 
+		       {data,code_editor}]),
+    config_editor(Editor, [{vscroll,right}, {hscroll,bottom}]),
+    Font = dbg_ui_win:font(normal),
+    config_editor(Editor, [{wrap,none}, {fg,{{{1,0},'end'},black}},
+			   {font, Font},
+			   {font_style, {{{1,0},'end'},Font}}]),
+    Editor.
+
+resize_code_area(WinInfo, Key, Diff) ->
+    gs:config('CodeArea', {Key,gs:read('CodeArea', Key)+Diff}),
+    case Key of
+	width ->
+	    gs:config(info_window, {Key,gs:read(info_window,Key)+Diff});
+	height -> ignore
+    end,
+
+    %% Resize all code editors
+    Value = gs:read('CodeEditor', Key)+Diff,
+    gs:config('CodeEditor', {Key,Value}),
+    Editors = WinInfo#winInfo.editors,
+    lists:foreach(fun({_Mod, Editor}) ->
+			  gs:config(Editor, {Key,Value})
+		  end,
+		  Editors).
+
+%%--Button Area-------------------------------------------------------
+
+buttons() ->
+    [{'Step','StepButton'}, {'Next','NextButton'},
+     {'Continue','ContinueButton'}, {'Finish','FinishButton'},
+     {'Where','WhereButton'}, {'Up','UpButton'}, {'Down','DownButton'}].
+
+is_button(Name) ->
+    case lists:keysearch(Name, 1, buttons()) of
+	{value, {Name, Button}} -> {true, Button};
+	false -> false
+    end.
+
+button_area(Bu, X, Y, FrameOpts, Win) ->
+    {W,H} = case Bu of
+		open -> {546,30};
+		close -> {0,0}
+	    end,
+    gs:frame('ButtonArea', Win,
+	     [{x,X}, {y,Y}, {width,W}, {height,H} | FrameOpts]),
+    Font = dbg_ui_win:font(normal),
+    lists:foldl(fun({Name, Button}, Xb) ->
+			gs:button(Button, 'ButtonArea',
+				  [{label, {text,Name}}, {font,Font},
+				   {x, Xb}, {y, 1},
+				   {width, 77}, {height, 24},
+				   {data, {button,Name}}]),
+			Xb+78
+		end,
+		1,
+		buttons()).
+
+resize_button_area(close, width, _Diff) ->
+    ignore;
+resize_button_area(open, width, Diff) ->
+    gs:config('ButtonArea', {width, gs:read('ButtonArea', width)+Diff}).
+
+%%--Evaluator Area----------------------------------------------------
+
+eval_area({Ev,Bi}, X, Y, FrameOpts, Win) ->
+    {W,H} = if
+		Ev==open -> {289,200};
+		true -> {0,0}
+	    end,
+    Font = dbg_ui_win:font(normal),
+    gs:frame('EvalArea', Win,
+	     [{x,X}, {y,Y}, {width,W}, {height,H} | FrameOpts]),
+    gs:label('EvalArea',
+	     [{label,{text,"Evaluator:"}}, {font, Font},
+	      {x,5}, {y,35}, {width,80}, {height,25},
+	      {anchor,sw}, {align,center}]),
+    gs:entry('EvalEntry', 'EvalArea',
+	     [{font, Font},
+	      {x,80}, {y,35}, {width,185}, {height,25},
+	      {anchor,sw}, {keypress,true}]),
+    gs:editor('EvalEditor', 'EvalArea',
+	      [{x,5}, {y,35}, {width, 280}, {height, 160},
+	       {keypress,false},
+	       {vscroll,right}, {hscroll,bottom},
+	       {wrap,none}, {fg,{{{1,0},'end'},black}},
+	       {font, Font},
+	       {font_style,{{{1,0},'end'},Font}}]),
+    gs:config('EvalEditor', {enable, false}),
+    if
+	Ev==open, Bi==close -> resize_eval_area(Ev, width, 257);
+	true -> ignore
+    end.
+
+resize_eval_area(close, _Key, _Diff) ->
+    ignore;
+resize_eval_area(open, Key, Diff) ->
+    New = gs:read('EvalArea', Key)+Diff,
+    gs:config('EvalArea', {Key,New}),
+    case Key of
+	width ->
+	    gs:config('EvalEntry', {width,New-104}),
+	    gs:config('EvalEditor', {width,New-9});
+	height ->
+	    gs:config('EvalEditor', {height,New-40})
+    end.
+
+%%--Bindings Area-----------------------------------------------------
+
+bind_area({Ev,Bi}, X, Y, FrameOpts, Win) ->
+    {W,H} = if
+		Bi==open -> {249,200};
+		true -> {0,0}
+	    end,
+    gs:frame('BindArea', Win,
+	     [{x,X}, {y,Y}, {width,W}, {height,H} | FrameOpts]),
+
+    Font = dbg_ui_win:font(bold),
+    gs:grid('BindGrid', 'BindArea',
+	    [{x,2}, {y,2}, {height,193}, {width,241},
+	     {fg,black}, {vscroll,right}, {hscroll,bottom},
+	     {font,Font},
+	     calc_columnwidths(241), {rows, {1,50}}]), 
+    gs:gridline('BindGrid',
+		[{row,1}, {height,14}, {fg,blue},
+		 {text,{1,"Name"}}, {text,{2,"Value"}}, {font,Font}]),
+    gs:config('BindGrid', {rows,{1,1}}),
+    if
+	Bi==open, Ev==close -> resize_bind_area(Bi, width, 297);
+	true -> ignore
+    end.
+
+resize_bind_area(close, _Key, _Diff) ->
+    ignore;
+resize_bind_area(open, Key, Diff) ->
+    New = gs:read('BindArea', Key)+Diff,
+    gs:config('BindArea', {Key,New}),
+    case Key of
+	width ->
+	    gs:config('BindGrid', {width,New-8}),
+	    Cols = calc_columnwidths(New-8),
+	    gs:config('BindGrid', Cols);
+	height ->
+	    gs:config('BindGrid', {height,New-7})
+    end.
+
+calc_columnwidths(Width) ->    
+    if Width =< 291 -> 
+	    {columnwidths,[90,198]};
+       true -> 
+	    S = (Width)/(90+198),
+	    {columnwidths,[round(90*S),round(198*S)]}
+    end.
+
+%%--Trace Area--------------------------------------------------------
+
+trace_area(Tr, X, Y, FrameOpts, Win) ->
+    {W,H} = case Tr of
+		open -> {546,200};
+		close -> {0,0}
+	    end,
+    gs:frame('TraceArea', Win,
+	     [{x,X}, {y,Y}, {width,W}, {height,H} | FrameOpts]),
+    Editor = gs:editor('TraceEditor', 'TraceArea',
+		       [{x,5}, {y,5}, {width,536}, {height,190},
+			{keypress,false}]),
+    Font = dbg_ui_win:font(normal),
+    config_editor(Editor,
+		  [{vscroll,right}, {hscroll,bottom},
+		   {wrap,none},{fg,{{{1,0},'end'},black}},
+		   {font, Font},
+		   {font_style,{{{1,0},'end'},Font}}]).
+
+resize_trace_area(close, _Key, _Diff) ->
+    ignore;
+resize_trace_area(open, Key, Diff) ->
+    New = gs:read('TraceArea', Key)+Diff,
+    gs:config('TraceArea', {Key,New}),
+    gs:config('TraceEditor', {Key,New-10}).
+
+%%--Editors-----------------------------------------------------------
+
+config_editor(Editor, Opts) ->
+    gs:config(Editor, {enable,true}),
+    gs:config(Editor, Opts),
+    gs:config(Editor, {enable,false}).
+
+%%--Resize Bars-------------------------------------------------------
+%% The resize bars are used to resize the areas within the window.
+
+%%--------------------------------------------------------------------
+%% resizebar(Flag, Name, X, Y, W, H, Obj) -> resizebar()
+%%   Flag = open | close
+%%   Name = atom()
+%%   X = Y = integer()  Coordinates relative to Obj
+%%   W = H = integer()  Width and height
+%%   Obj = gsobj()
+%% Creates a 'resize bar', a frame object over which the cursor will
+%% be of the 'resize' type.
+%%--------------------------------------------------------------------
+resizebar(Flag, Name, X, Y, W, H, Obj) ->
+    {W2,H2} = case Flag of
+		  open  -> {W,H};
+		  close -> {0,0}
+	      end,
+    gs:create(frame, Name, Obj, [{x,X}, {y,Y}, {width,W2}, {height,H2},
+				 {bw,2},
+				 {cursor,resize},
+				 {buttonpress,true}, {buttonrelease,true},
+				 {data,resizebar}]).
+
+rb1({_Bu,Ev,Bi,Tr}) ->
+    if
+	Ev==close, Bi==close, Tr==close -> close;
+	true -> open
+    end.
+    
+rb2({_Bu,Ev,Bi,Tr}) ->
+    if
+	Tr==open ->
+	    if
+		Ev==close, Bi==close -> close;
+		true -> open
+	    end;
+	true -> close
+    end.
+    
+rb3({_Bu,Ev,Bi,_Tr}) ->
+    if
+	Ev==open, Bi==open -> open;
+	true -> close
+    end.
+
+%%--Configuration-----------------------------------------------------
+%% Resize the window as well as its contents
+
+%%--------------------------------------------------------------------
+%% config_v()
+%% Reconfigure the window vertically.
+%%--------------------------------------------------------------------
+config_v() ->
+    Y1 = 25+gs:read('CodeArea', height),
+    gs:config('RB1', {y,Y1}),
+    
+    Y2 = Y1+gs:read('RB1', height),
+    gs:config('ButtonArea', {y,Y2}),
+    
+    Y3 = Y2+gs:read('ButtonArea', height),
+    gs:config('EvalArea', {y,Y3}),
+    gs:config('RB3', {y,Y3}),
+    gs:config('BindArea', {y,Y3}),
+    
+    Y4 = Y3 + max(gs:read('EvalArea', height),
+		  gs:read('BindArea', height)),
+    gs:config('RB2', {y,Y4}),
+    
+    Y5 = Y4 + gs:read('RB2', height),
+    gs:config('TraceArea', {y,Y5}).
+
+%%--------------------------------------------------------------------
+%% config_h()
+%% Reconfigure the window horizontally.
+%%--------------------------------------------------------------------
+config_h() ->
+    X1 = 2+gs:read('EvalArea', width),
+    gs:config('RB3', {x,X1}),
+    
+    X2 = X1+gs:read('RB3', width),
+    gs:config('BindArea', {x,X2}).
+
+%%--------------------------------------------------------------------
+%% configure(WinInfo, W, H)
+%% The window has been resized, now its contents must be resized too.
+%%--------------------------------------------------------------------
+configure(WinInfo, NewW, NewH) ->
+    {Bu,Ev,Bi,Tr} = Flags = WinInfo#winInfo.flags,
+    
+    OldW = gs:read('CodeArea', width)+4,
+    OldH = 25+gs:read('CodeArea', height)+
+	gs:read('RB1', height)+
+	gs:read('ButtonArea', height)+
+	max(gs:read('EvalArea', height), gs:read('BindArea', height))+
+	gs:read('RB2', height)+
+	gs:read('TraceArea', height),
+
+    %% Adjust width unless it is unchanged or less than minimum width
+    if
+	OldW/=NewW ->
+	    {Dcode,Deval,Dbind} = configure_widths(OldW,NewW,Flags),
+	    resize_code_area(WinInfo, width, Dcode),
+	    case rb1(Flags) of
+		open ->
+		    gs:config('RB1', {width,gs:read('RB1',width)+Dcode});
+		close -> ignore
+	    end,
+	    resize_button_area(Bu, width, Dcode),
+	    resize_eval_area(Ev, width, Deval),
+	    resize_bind_area(Bi, width, Dbind),
+	    case rb2(Flags) of
+		open ->
+		    gs:config('RB2', {width,gs:read('RB2',width)+Dcode});
+		close -> ignore
+	    end,
+	    resize_trace_area(Tr, width, Dcode),
+	    config_h();
+	true -> ignore
+    end,
+    
+    %% Adjust height unless it is unchanged or less than minimum height
+    if
+	OldH/=NewH ->
+	    {Dcode2,Deval2,Dtrace} = configure_heights(OldH,NewH,Flags),
+	    resize_code_area(WinInfo, height, Dcode2),
+	    resize_eval_area(Ev, height, Deval2),
+	    case rb3(Flags) of
+		open ->
+		    gs:config('RB3',
+			      {height,gs:read('RB3',height)+Deval2});
+		close -> ignore
+	    end,
+	    resize_bind_area(Bi, height, Deval2),
+	    resize_trace_area(Tr, height, Dtrace),
+	    config_v();
+	true -> ignore
+    end.
+
+%% Compute how much the width of each frame must be increased or
+%% decreased in order to adjust to the new window width.
+configure_widths(OldW, NewW, Flags) ->
+    {_Bu,Ev,Bi,_Tr} = Flags,
+
+    %% Difference between old and new width, considering min window width
+    Diff = abs(max(OldW,330)-max(NewW,330)),
+    
+    %% Check how much the frames can be resized in reality
+    Limits = if
+		 %% Window larger
+		 NewW>OldW ->
+		     if
+			 Ev==open,Bi==open -> {0,Diff,Diff};
+			 Ev==open -> {0,Diff,0};
+			 Bi==open -> {0,0,Diff};
+			 true -> {Diff,0,0}
+		     end;
+		 
+		 %% Window smaller; get difference between min size
+		 %% and current size
+		 OldW>NewW ->
+		     if
+			 Ev==open,Bi==open ->
+			     {0,
+			      gs:read('EvalArea',width)-204,
+			      gs:read('BindArea',width)-112};
+			 Ev==open -> {0,Diff,0};
+			 Bi==open -> {0,0,Diff};
+			 true -> {Diff,0,0}
+		     end
+	     end,
+    
+    case Limits of
+
+	%% No Shell or Bind frame, larger window
+	{T,0,0} when NewW>OldW -> {T,0,0};
+	
+	%% No Shell or Bind frame, smaller window
+	{T,0,0} when OldW>NewW -> {-T,0,0};
+
+	%% Window larger; divide Diff among the frames and return result
+	{_,Sf,B} when NewW>OldW ->
+	    {_,Sf2,B2} = divide([{0,0},{0,Sf},{0,B}],Diff),
+	    {Sf2+B2,Sf2,B2};
+
+	%% Window smaller; divide Diff among the frames and return
+	%% the inverted result (the frames should shrink)
+	{_,Sf,B} when OldW>NewW ->
+	    {_,Sf2,B2} = divide([{0,0},{0,Sf},{0,B}],Diff),
+	    {-(Sf2+B2),-Sf2,-B2}
+    end.
+
+%% Compute how much the height of each frame must be increased or
+%% decreased in order to adjust to the new window height.
+configure_heights(OldH, NewH, Flags) ->
+    {_Bu,Ev,Bi,Tr} = Flags,
+
+    %% Difference between old and new height, considering min win height
+    MinH = min_height(Flags),
+    Diff = abs(max(OldH,MinH)-max(NewH,MinH)),
+    
+    %% Check how much the frames can be resized in reality
+    {T,Sf,Ff} = if
+		  %% Window larger
+		  NewH>OldH ->
+		      {Diff,
+		       if
+			   Ev==close, Bi==close -> 0;
+			   true -> Diff
+		       end,
+		       if
+			   Tr==open -> Diff;
+			   true -> 0
+		       end};
+
+		  %% Window smaller; get difference between min size
+		  %% and current size
+		  OldH>NewH ->
+		      {gs:read('CodeArea',height)-100,
+		       if
+			   Ev==close, Bi==close -> 0;
+			   true ->
+			       if
+				   Ev==open ->
+				       gs:read('EvalArea',height)-100;
+				   Bi==open ->
+				       gs:read('BindArea',height)-100
+			       end
+		       end,
+		       if
+			   Tr==open -> gs:read('TraceArea',height)-100;
+			   true -> 0
+		       end}
+	      end,
+    
+    if
+	%% Window larger; divide Diff among the frames and return result
+	NewH>OldH -> divide([{0,T},{0,Sf},{0,Ff}],Diff);
+
+	%% Window smaller; divide Diff among the frames and return
+	%% the inverted result (the frames should shrink)
+	OldH>NewH ->
+	    {T2,Sf2,Ff2} = divide([{0,T},{0,Sf},{0,Ff}],Diff),
+	    {-T2,-Sf2,-Ff2}
+    end.
+
+%% Compute minimum window height
+min_height(Flags) ->
+    {Bu,S,Bi,F} = Flags,
+    H1 = 25 + 100 + 2, % Upper pad + Trace frame + lower pad
+    H2 = H1 + bu(Bu) + s_bi(S,Bi) + f(F),
+    H3 = case rb1(Flags) of
+	     open -> H2+10;
+	     close -> H2
+	 end,
+    H4 = case rb2(Flags) of
+	     open -> H3+10;
+	     close -> H3
+	 end,
+    H4.
+
+bu(close) -> 0;
+bu(open)  -> 30.
+
+s_bi(close,close) -> 0;
+s_bi(_,_) -> 100.
+
+f(close) -> 0;
+f(open)  -> 100.
+
+%% Try to distribute Diff as evenly as possible between E1, E2 and E3.
+divide([{T,T},{S,S},{F,F}], _Diff) ->
+    {T,S,F};
+divide(L, Diff) ->
+    [{T,Tmax},{S,Smax},{F,Fmax}] = L,
+
+    %% Count how many elements in L can still be filled
+    Rem = remaining(L),
+    
+    %% Divide Diff by Rem
+    D = Diff div Rem,
+
+    if
+	%% All of Diff has been distributed
+	D==0 -> {T,S,F};
+	
+	true ->
+    
+	    %% For each element, try to add as much as possible of D
+	    {NewT,Dt} = divide2(D,T,Tmax),
+	    {NewS,Ds} = divide2(D,S,Smax),
+	    {NewF,Df} = divide2(D,F,Fmax),
+    
+	    %% Recur with a list of elements with new current values
+	    %% and decreased Diff
+	    divide([{NewT,Tmax},{NewS,Smax},{NewF,Fmax}],
+		   (Diff rem Rem)+Dt+Ds+Df)
+    end.
+
+%% Count the number of 'non-filled' elements in L, ie where Curr<Max.
+remaining([]) -> 0;
+remaining([{Max,Max}|T]) -> remaining(T);
+remaining([_H|T]) -> 1 + remaining(T).
+
+divide2(_Diff, Max, Max) -> {Max,0};
+divide2(Diff, Curr, Max) ->
+    New = Curr+Diff,
+    if
+	New>Max -> {Max,New-Max};
+	true -> {New,0}
+    end.
+
+%%--Resizing using resize bars----------------------------------------
+%% Motions event will move the ResizeBar accordingly in Win, when
+%% the mouse button is released, the window is reconfigured.
+
+resize(WinInfo, ResizeBar) ->		
+    
+    %% Get window dimensions
+    W = gs:read(WinInfo#winInfo.window, width),
+    H = gs:read(WinInfo#winInfo.window, height),
+    
+    %% Call resize loop with min and max for the resize bars derived
+    %% from the window dimensions
+    resizeloop(WinInfo, ResizeBar, null,
+	       rblimits('RB1',W,H),
+	       rblimits('RB2',W,H),
+	       rblimits('RB3',W,H)).
+
+resizeloop(WI, RB, Prev, {Min1,Max1},{Min2,Max2},{Min3,Max3}) ->
+    receive
+	{gs,_,motion,_,[_,Y]} when RB=='RB1', Y>Min1,Y<Max1 ->
+	    gs:config('RB1', {y,Y}),
+	    resizeloop(WI, RB, Y, {Min1,Max1},{Min2,Max2},{Min3,Max3});
+	{gs,_,motion,_,_} when RB=='RB1' ->
+	    resizeloop(WI, RB, Prev,{Min1,Max1},{Min2,Max2},{Min3,Max3});
+	
+	{gs,_,motion,_,[_,Y]} when RB=='RB2', Y>Min2,Y<Max2 ->
+	    gs:config('RB2', {y,Y}),
+	    resizeloop(WI, RB, Y, {Min1,Max1},{Min2,Max2},{Min3,Max3});
+	{gs,_,motion,_,_} when RB=='RB2' ->
+	    resizeloop(WI, RB, Prev,{Min1,Max1},{Min2,Max2},{Min3,Max3});
+	 
+	{gs,_,motion,_,[X,_]} when RB=='RB3', X>Min3,X<Max3 ->
+	    gs:config('RB3', {x,X}),
+	    resizeloop(WI, RB, X, {Min1,Max1},{Min2,Max2},{Min3,Max3});
+	{gs,_,motion,_,_} when RB=='RB3' ->
+	    resizeloop(WI, RB, Prev,{Min1,Max1},{Min2,Max2},{Min3,Max3});
+	
+	{gs,_,buttonrelease,_,_} ->
+	    resize_win(WI, RB, Prev)
+    end.
+
+resize_win(_WinInfo, _RB, null) -> ignore;
+resize_win(WinInfo, 'RB1', Y) ->
+    {_Bu,S,Bi,F} = Flags = WinInfo#winInfo.flags,
+    H = gs:read('CodeArea', height),
+    Diff = H-(Y-25),
+
+    %% Resize Code, Evaluator and Binding areas
+    resize_code_area(WinInfo, height, -Diff),
+    if
+	S==close, Bi==close, F==open ->
+	    resize_trace_area(open, height, Diff);
+	true ->
+	    resize_eval_area(S, height, Diff),
+	    resize_bind_area(Bi, height, Diff)
+    end,
+
+    %% Resize vertical resize bar
+    case rb3(Flags) of
+	open -> gs:config('RB3', {height,gs:read('RB3',height)+Diff});
+	close -> ignore
+    end,
+    
+    %% Adjust the frames y coordinates
+    config_v();
+resize_win(WinInfo, 'RB2', Y) ->
+    {_Bu,S,Bi,F} = Flags = WinInfo#winInfo.flags,
+    Prev = gs:read('TraceArea',y),
+    Diff = Prev-(Y+10),
+    
+    %% Resize Trace, Evaluator and Binding areas
+    resize_trace_area(F, height, Diff),
+    resize_eval_area(S, height, -Diff),
+    resize_bind_area(Bi, height, -Diff),
+
+    %% Resize vertical resize bar
+    case rb3(Flags) of
+	open -> gs:config('RB3', {height,gs:read('RB3',height)-Diff});
+	close -> ignore
+    end,
+
+    %% Adjust the frames y coordinates
+    config_v();
+
+resize_win(WinInfo, 'RB3', X) ->
+    {_Bu,S,Bi,_F} = WinInfo#winInfo.flags,
+    Prev = gs:read('BindArea', x),
+    Diff = Prev-(X+10),
+    
+    %% Resize Binding and Trace areas
+    resize_bind_area(Bi, width, Diff),
+    resize_eval_area(S, width, -Diff),
+
+    %% Adjust the frames x coordinates
+    config_h().
+
+%% Given the window dimensions, return the limits for a  resize bar.
+rblimits('RB1',_W,H) ->
+    
+    %% Code frame should not have height <100
+    Min = 126,
+    
+    %% Max is decided by a minimum distance to 'RB2'
+    %% unless 'RB2' is invisible and 'CodeArea' is visible
+    %% (=> EvalFrame and BindFrame invisible) in which case
+    %% TraceFrame should not have height <100
+    RB2 = gs:read('RB2',height),
+    FF = gs:read('TraceArea',height),
+    Max = case RB2 of
+	      0 when FF/=0 ->
+		  H-112;
+	      _ ->
+		  Y = gs:read('RB2',y),
+		  max(Min,Y-140)
+	  end,
+    
+    {Min,Max};
+rblimits('RB2',_W,H) ->
+
+    %% TraceFrame should not have height <100
+    Max = H-112,
+    
+    %% Min is decided by a minimum distance to 'RB1'
+    Y = gs:read('RB1',y),
+    Min = min(Max,Y+140),
+    
+    {Min,Max};
+
+rblimits('RB3',W,_H) ->
+    
+    %% Neither CodeArea nor BindArea should occupy 
+    %% less than 1/3 of the total window width and EvalFrame should
+    %% be at least 289 pixels wide
+    {max(round(W/3),289),round(2*W/3)}.
+
+max(A, B) when A>B -> A;
+max(_A, B) -> B.
+
+min(A, B) when A<B -> A;
+min(_A, B) -> B.
+
+
+%%====================================================================
+%% 'Go To Line' and 'Search' help windows
+%%====================================================================
+
+helpwin(gotoline, WinInfo, GS, Coords) ->
+    spawn_link(?MODULE, helpwin, [gotoline, WinInfo, GS, Coords,self()]);
+helpwin(search, WinInfo, GS, Coords) ->
+    spawn_link(?MODULE, helpwin, [search, WinInfo, GS, Coords, self()]).
+
+helpwin(Type, WinInfo, GS, Coords, AttPid) ->
+    {_Mod, Editor} =  WinInfo#winInfo.editor,
+    Data = case Type of
+	       gotoline -> null;
+	       search ->
+		   {{1, 0}, false}
+	   end,
+    Win = helpwin(Type, GS, Coords),
+    helpwin_loop(Type, AttPid, Editor, Data, Win).
+
+helpwin_loop(Type, AttPid, Editor, Data, Win) ->
+    receive
+	{gs, _Id, destroy, _Data, _Arg} ->
+	    helpwin_stop(Type, AttPid, Editor, Data),
+	    true;
+
+	{gs, _Id, keypress, _Data, ['Return'|_]} ->
+	    gs:config(btn(Win), flash),
+	    Data2 = helpwin_action(Type, default,
+				   AttPid, Editor, Data, Win),
+	    helpwin_loop(Type, AttPid, Editor, Data2, Win);
+	{gs, _Id, keypress, _Data, _Arg} ->
+	    helpwin_loop(Type, AttPid, Editor, Data, Win);
+	
+	{gs, _Id, click, _Data, ["Clear"]} ->
+	    gs:config(ent(Win), {delete, {0,last}}),
+	    Data2 = helpwin_clear(Type, AttPid, Editor, Data, Win),
+	    helpwin_loop(Type, AttPid, Editor, Data2, Win);
+	{gs, _Id, click, _Data, ["Close"]} ->
+	    helpwin_stop(Type, AttPid, Editor, Data),
+	    true;
+	{gs, _Id, click, Action, _Arg} ->
+	    Data2 =
+		helpwin_action(Type, Action, AttPid, Editor, Data, Win),
+	    helpwin_loop(Type, AttPid, Editor, Data2, Win)
+    end.
+
+helpwin_stop(gotoline, _AttPid, _Editor, _Data) ->
+    ignore;
+helpwin_stop(search, _AttPid, Editor, {Pos, _CS}) ->
+    unmark_string(Editor, Pos).
+
+helpwin_clear(gotoline, _AttPid, _Editor, Data, _Win) ->
+    Data;
+helpwin_clear(search, _AttPid, Editor, {Pos, CS}, Win) ->
+    unmark_string(Editor, Pos),
+    gs:config(lbl(Win), {label, {text,""}}),
+    {{1, 0}, CS}.
+
+helpwin_action(gotoline, default, AttPid, _Editor, Data, Win) ->
+    case string:strip(gs:read(ent(Win), text)) of
+	"" -> ignore;
+	Str ->
+	    case catch list_to_integer(Str) of
+		{'EXIT', _Reason} -> ignore;
+		Line -> AttPid ! {gui, {gotoline, Line}}
+	    end
+    end,
+    Data;
+helpwin_action(search, case_sensitive, _AttPid, _Ed, {Pos, CS}, _Win) ->
+    Bool = if CS==true -> false; CS==false -> true end,
+    {Pos, Bool};
+helpwin_action(search, default, _AttPid, Editor, {Pos, CS}, Win) ->
+    gs:config(lbl(Win), {label, {text, ""}}),
+    unmark_string(Editor, Pos),
+    case gs:read(ent(Win), text) of
+	"" -> {Pos, CS};
+	Str ->
+	    gs:config(lbl(Win), {label, {text,"Searching..."}}),
+	    Str2 = lowercase(CS, Str),
+	    case search(Str2, Editor, gs:read(Editor, size), Pos, CS) of
+		{Row, Col} ->
+		    gs:config(lbl(Win), {label, {text,""}}),
+		    mark_string(Editor, {Row, Col}, Str),
+		    {{Row, Col}, CS};
+		not_found ->
+		    gs:config(lbl(Win), {label, {text,"Not found"}}),
+		    {Pos, CS}
+	    end
+    end.
+
+search(_Str, _Editor, Max, {Row, _Col}, _CS) when Row>Max ->
+    not_found;
+search(Str, Editor, Max, {Row, Col}, CS) ->
+    SearchIn = lowercase(CS, gs:read(Editor,
+				     {get,{{Row,Col+1},{Row,lineend}}})),
+    case string:str(SearchIn, Str) of
+	0 -> search(Str, Editor, Max, {Row+1, 0}, CS);
+	N -> {Row, Col+N}
+    end.
+
+lowercase(true, Str) -> Str;
+lowercase(false, Str) ->
+    lists:map(fun(Char) ->
+		      if
+			  Char>=$A, Char=<$Z -> Char+32;
+			  true -> Char
+		      end
+	      end,
+	      Str).
+
+mark_string(Editor, {Row, Col}, Str) ->
+    Between = {{Row,Col}, {Row,Col+length(Str)}},
+    Font = dbg_ui_win:font(bold),
+    gs:config(Editor, [{vscrollpos, Row-5},
+		       {font_style, {Between, Font}},
+		       {fg, {Between, red}}]).
+
+unmark_string(Editor, {Row, Col}) ->
+    Between = {{Row,Col}, {Row,lineend}},
+    Font = dbg_ui_win:font(normal),
+    gs:config(Editor, [{vscrollpos, Row-5},
+		       {font_style, {Between, Font}},
+		       {fg, {Between, black}}]).
+
+helpwin(Type, GS, {X, Y}) ->
+    W = 200, Pad=10, Wbtn = 50,
+
+    Title =
+	case Type of search -> "Search"; gotoline -> "Go To Line" end,
+    Win = gs:window(GS, [{title, Title}, {x, X}, {y, Y}, {width, W},
+			 {destroy, true}]),
+    
+    Ent = gs:entry(Win, [{x, Pad}, {y, Pad}, {width, W-2*Pad},
+			 {keypress, true}]),
+    Hent = gs:read(Ent, height),
+
+    Font = dbg_ui_win:font(normal),
+
+    {Ybtn, Lbl} =
+	case Type of
+	    search ->
+		Ycb = Pad+Hent,
+		gs:checkbutton(Win, [{label, {text, "Case Sensitive"}},
+				     {font, Font},
+				     {align, w},
+				     {x, Pad}, {y, Ycb},
+				     {width, W-2*Pad}, {height, 15},
+				     {data, case_sensitive}]),
+		Ylbl = Ycb+15,
+		{Ylbl+Hent+Pad,
+		 gs:label(Win, [{x, Pad}, {y, Ylbl},
+				{width, W-2*Pad}, {height, Hent}])};
+	    gotoline -> {Pad+Hent+Pad, null}
+	end,
+
+    BtnLbl = case Type of search -> "Search"; gotoline -> "Go" end,
+    Btn = gs:button(Win, [{label, {text, BtnLbl}}, {font, Font},
+			  {x, W/2-3/2*Wbtn-Pad}, {y, Ybtn},
+			  {width, Wbtn}, {height, Hent},
+			  {data, default}]),
+    gs:button(Win, [{label, {text, "Clear"}}, {font, Font},
+		    {x, W/2-1/2*Wbtn}, {y, Ybtn},
+		    {width, Wbtn}, {height, Hent}]),
+    gs:button(Win, [{label, {text, "Close"}}, {font, Font},
+		    {x, W/2+1/2*Wbtn+Pad}, {y, Ybtn},
+		    {width, Wbtn}, {height, Hent}]),
+
+    H = Ybtn+Hent+Pad,
+    gs:config(Win, [{height, H}, {map, true}]),
+    {Ent, Lbl, Btn}.
+
+ent(Win) -> element(1, Win).
+lbl(Win) -> element(2, Win).
+btn(Win) -> element(3, Win).