1%%
2%% %CopyrightBegin%
3%%
4%% Copyright Ericsson AB 2011-2017. All Rights Reserved.
5%%
6%% Licensed under the Apache License, Version 2.0 (the "License");
7%% you may not use this file except in compliance with the License.
8%% You may obtain a copy of the License at
9%%
10%%     http://www.apache.org/licenses/LICENSE-2.0
11%%
12%% Unless required by applicable law or agreed to in writing, software
13%% distributed under the License is distributed on an "AS IS" BASIS,
14%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15%% See the License for the specific language governing permissions and
16%% limitations under the License.
17%%
18%% %CopyrightEnd%
19-module(observer_app_wx).
20
21-export([start_link/3]).
22
23%% wx_object callbacks
24-export([init/1, handle_info/2, terminate/2, code_change/3, handle_call/3,
25	 handle_event/2, handle_sync_event/3, handle_cast/2]).
26
27-behaviour(wx_object).
28-include_lib("wx/include/wx.hrl").
29-include("observer_defs.hrl").
30
31%% Import drawing wrappers
32-import(observer_perf_wx, [haveGC/0, make_gc/2, destroy_gc/1,
33			   setPen/2, setFont/3, setBrush/2,
34			   strokeLine/5, strokeLines/2, drawRoundedRectangle/6,
35			   drawText/4, getTextExtent/2]).
36
37-record(state,
38	{
39	  parent,
40	  panel,
41	  apps_w,
42	  app_w,
43	  paint,
44	  current,
45	  app,
46	  sel,
47	  appmon,
48	  usegc = false
49	}).
50
51-record(paint, {font, pen, brush, sel, links}).
52
53-record(app, {ptree, n2p, links, dim}).
54-record(box, {x,y, w,h, s1}).
55-record(str, {x,y,text,pid}).
56
57-define(BX_E, 10). %% Empty width between text and box
58-define(BX_HE, (?BX_E div 2)).
59-define(BY_E, 10). %% Empty height between text and box
60-define(BY_HE, (?BY_E div 2)).
61
62-define(BB_X, 16). %% Empty width between boxes
63-define(BB_Y, 12). %% Empty height between boxes
64
65-define(DRAWAREA, 5).
66-define(ID_PROC_INFO, 101).
67-define(ID_PROC_MSG,  102).
68-define(ID_PROC_KILL, 103).
69-define(ID_TRACE_PID, 104).
70-define(ID_TRACE_NAME, 105).
71-define(ID_TRACE_TREE_PIDS, 106).
72-define(ID_TRACE_TREE_NAMES, 107).
73
74-define(wxGC, wxGraphicsContext).
75
76start_link(Notebook, Parent, Config) ->
77    wx_object:start_link(?MODULE, [Notebook, Parent, Config], []).
78
79init([Notebook, Parent, _Config]) ->
80    Panel = wxPanel:new(Notebook, [{size, wxWindow:getClientSize(Notebook)},
81				   {winid, 1}
82				  ]),
83    Main = wxBoxSizer:new(?wxHORIZONTAL),
84    Splitter = wxSplitterWindow:new(Panel, [{size, wxWindow:getClientSize(Panel)},
85					    {style, ?SASH_STYLE},
86					    {id, 2}
87					   ]),
88    Apps = wxListBox:new(Splitter, 3, []),
89    %% Need extra panel and sizer to get correct size updates
90    %% in draw area for some reason
91    P2 = wxPanel:new(Splitter, [{winid, 4}]),
92    Extra = wxBoxSizer:new(?wxVERTICAL),
93    DrawingArea = wxScrolledWindow:new(P2, [{winid, ?DRAWAREA},
94					    {style,?wxFULL_REPAINT_ON_RESIZE}]),
95    wxWindow:setBackgroundColour(DrawingArea, ?wxWHITE),
96    wxWindow:setVirtualSize(DrawingArea, 800, 800),
97    wxSplitterWindow:setMinimumPaneSize(Splitter,50),
98    wxSizer:add(Extra, DrawingArea, [{flag, ?wxEXPAND},{proportion, 1}]),
99    wxWindow:setSizer(P2, Extra),
100    wxSplitterWindow:splitVertically(Splitter, Apps, P2, [{sashPosition, 150}]),
101    wxWindow:setSizer(Panel, Main),
102
103    wxSizer:add(Main, Splitter, [{flag, ?wxEXPAND bor ?wxALL},
104				 {proportion, 1}, {border, 5}]),
105    wxWindow:setSizer(Panel, Main),
106    wxListBox:connect(Apps, command_listbox_selected),
107    wxPanel:connect(DrawingArea, paint, [callback]),
108    wxPanel:connect(DrawingArea, size, [{skip, true}]),
109    wxPanel:connect(DrawingArea, left_up),
110    wxPanel:connect(DrawingArea, left_dclick),
111    wxPanel:connect(DrawingArea, right_down),
112    case os:type() of
113	{win32, _} -> %% Ignore erase on windows
114	    wxPanel:connect(DrawingArea, erase_background, [{callback, fun(_,_) -> ok end}]);
115	_ -> ok
116    end,
117
118    UseGC = haveGC(),
119    Version28 = ?wxMAJOR_VERSION =:= 2 andalso ?wxMINOR_VERSION =:= 8,
120    Scale = observer_wx:get_scale(),
121    Font = case os:type() of
122	       {unix,_} when UseGC, Version28 ->
123		   wxFont:new(Scale * 12,?wxFONTFAMILY_DECORATIVE,?wxFONTSTYLE_NORMAL,?wxFONTWEIGHT_NORMAL);
124	       _ ->
125		   Font0 = wxSystemSettings:getFont(?wxSYS_DEFAULT_GUI_FONT),
126           wxFont:setPointSize(Font0, Scale * wxFont:getPointSize(Font0)),
127           Font0
128	   end,
129    SelCol   = wxSystemSettings:getColour(?wxSYS_COLOUR_HIGHLIGHT),
130    GreyBrush = wxBrush:new({230,230,240}),
131    SelBrush = wxBrush:new(SelCol),
132    LinkPen  = wxPen:new(SelCol, [{width, Scale * 2}]),
133    process_flag(trap_exit, true),
134    {Panel, #state{parent=Parent,
135		   panel =Panel,
136		   apps_w=Apps,
137		   app_w =DrawingArea,
138		   usegc = UseGC,
139		   paint=#paint{font = Font,
140				pen  = wxPen:new({80,80,80}, [{width, Scale * 2}]),
141				brush= GreyBrush,
142				sel  = SelBrush,
143				links= LinkPen
144			       }
145		  }}.
146
147setup_scrollbar(AppWin, App) ->
148    setup_scrollbar(wxWindow:getClientSize(AppWin), AppWin, App).
149
150setup_scrollbar({CW, CH}, AppWin, #app{dim={W0,H0}}) ->
151    W = max(W0,CW),
152    H = max(H0,CH),
153    PPC = 20,
154    if W0 =< CW, H0 =< CH ->
155	    wxScrolledWindow:setScrollbars(AppWin, W, H, 0, 0);
156       H0 =< CH ->
157	    wxScrolledWindow:setScrollbars(AppWin, PPC, H, W div PPC+1, 0);
158       W0 =< CW ->
159	    wxScrolledWindow:setScrollbars(AppWin, W, PPC, 0, H div PPC+1);
160       true ->
161	    wxScrolledWindow:setScrollbars(AppWin, PPC, PPC, W div PPC+1, H div PPC+1)
162    end;
163setup_scrollbar(_, _, undefined) -> ok.
164
165%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
166
167handle_event(#wx{event=#wxCommand{type=command_listbox_selected, cmdString=AppStr}},
168	     State = #state{appmon=AppMon, current=Prev}) ->
169    case AppStr of
170	[] ->
171	    {noreply, State};
172	_ ->
173	    App = list_to_atom(AppStr),
174	    (Prev =/= undefined) andalso appmon_info:app(AppMon, Prev, false, []),
175	    appmon_info:app(AppMon, App, true, []),
176	    {noreply, State#state{current=App}}
177    end;
178
179handle_event(#wx{id=Id, event=_Sz=#wxSize{size=Size}},
180	     State=#state{app=App, app_w=AppWin}) ->
181    Id =:= ?DRAWAREA andalso setup_scrollbar(Size,AppWin,App),
182    {noreply, State};
183
184handle_event(#wx{event=#wxMouse{type=Type, x=X0, y=Y0}},
185	     S0=#state{app=App, app_w=AppWin}) ->
186    case App of
187	#app{ptree=Tree} ->
188	    {X,Y} = wxScrolledWindow:calcUnscrolledPosition(AppWin, X0, Y0),
189	    Hit   = locate_node(X,Y, [Tree]),
190	    State = handle_mouse_click(Hit, Type, S0),
191	    {noreply, State};
192	_ ->
193	    {noreply, S0}
194    end;
195
196handle_event(#wx{event=#wxCommand{type=command_menu_selected}},
197	     State = #state{panel=Panel,sel=undefined}) ->
198    observer_lib:display_info_dialog(Panel,"Select process first"),
199    {noreply, State};
200
201handle_event(#wx{id=?ID_PROC_INFO, event=#wxCommand{type=command_menu_selected}},
202	     State = #state{sel={#box{s1=#str{pid=Pid}},_}}) ->
203    observer ! {open_link, Pid},
204    {noreply, State};
205
206handle_event(#wx{id=?ID_PROC_MSG, event=#wxCommand{type=command_menu_selected}},
207	     State = #state{panel=Panel, sel={#box{s1=#str{pid=Pid}},_}}) ->
208    case observer_lib:user_term(Panel, "Enter message", "") of
209	cancel ->         ok;
210	{ok, Term} ->     Pid ! Term;
211	{error, Error} -> observer_lib:display_info_dialog(Panel,Error)
212    end,
213    {noreply, State};
214
215handle_event(#wx{id=?ID_PROC_KILL, event=#wxCommand{type=command_menu_selected}},
216	     State = #state{panel=Panel, sel={#box{s1=#str{pid=Pid}},_}}) ->
217    case observer_lib:user_term(Panel, "Enter Exit Reason", "kill") of
218	cancel ->         ok;
219	{ok, Term} ->     exit(Pid, Term);
220	{error, Error} -> observer_lib:display_info_dialog(Panel,Error)
221    end,
222    {noreply, State};
223
224%%% Trace api
225handle_event(#wx{id=?ID_TRACE_PID, event=#wxCommand{type=command_menu_selected}},
226	     State = #state{sel={Box,_}}) ->
227    observer_trace_wx:add_processes([box_to_pid(Box)]),
228    {noreply, State};
229handle_event(#wx{id=?ID_TRACE_NAME, event=#wxCommand{type=command_menu_selected}},
230	     State = #state{sel={Box,_}}) ->
231    observer_trace_wx:add_processes([box_to_reg(Box)]),
232    {noreply, State};
233handle_event(#wx{id=?ID_TRACE_TREE_PIDS, event=#wxCommand{type=command_menu_selected}},
234	     State = #state{sel=Sel}) ->
235    Get = fun(Box) -> box_to_pid(Box) end,
236    observer_trace_wx:add_processes(tree_map(Sel, Get)),
237    {noreply, State};
238handle_event(#wx{id=?ID_TRACE_TREE_NAMES, event=#wxCommand{type=command_menu_selected}},
239	     State = #state{sel=Sel}) ->
240    Get = fun(Box) -> box_to_reg(Box) end,
241    observer_trace_wx:add_processes(tree_map(Sel, Get)),
242    {noreply, State};
243
244handle_event(Event, _State) ->
245    error({unhandled_event, Event}).
246
247%%%%%%%%%%
248handle_sync_event(#wx{event = #wxPaint{}},_,
249		  #state{app_w=DA, app=App, sel=Sel, paint=Paint, usegc=UseGC}) ->
250    GC = {GC0, DC} = make_gc(DA, UseGC),
251    case UseGC of
252	false ->
253	    wxScrolledWindow:doPrepareDC(DA,DC);
254	true ->
255	    %% Argh must handle scrolling when using ?wxGC
256	    {Sx,Sy} = wxScrolledWindow:calcScrolledPosition(DA, {0,0}),
257	    ?wxGC:translate(GC0, Sx,Sy)
258    end,
259    %% Nothing is drawn until wxPaintDC is destroyed.
260    draw(GC, App, Sel, Paint),
261    destroy_gc(GC),
262    ok.
263%%%%%%%%%%
264handle_call(get_config, _, State) ->
265    {reply, #{}, State};
266handle_call(Event, From, _State) ->
267    error({unhandled_call, Event, From}).
268
269handle_cast(Event, _State) ->
270    error({unhandled_cast, Event}).
271%%%%%%%%%%
272handle_info({active, Node}, State = #state{parent=Parent, current=Curr, appmon=Appmon}) ->
273    create_menus(Parent, []),
274    Pid = try
275	      Node = node(Appmon),
276	      Appmon
277	  catch _:_ ->
278		  {ok, P} = appmon_info:start_link(Node, self(), []),
279		  P
280	  end,
281    appmon_info:app_ctrl(Pid, Node, true, []),
282    (Curr =/= undefined) andalso appmon_info:app(Pid, Curr, true, []),
283    {noreply, State#state{appmon=Pid}};
284handle_info(not_active, State = #state{appmon=AppMon}) ->
285    appmon_info:app_ctrl(AppMon, node(AppMon), false, []),
286    lists:member(node(AppMon), nodes()) andalso exit(AppMon, normal),
287    observer_wx:set_status(""),
288    {noreply, State#state{appmon=undefined}};
289handle_info({delivery, Pid, app_ctrl, _, Apps0},
290	    State = #state{appmon=Pid, apps_w=LBox, current=Curr0}) ->
291    Apps = [atom_to_list(App) || {_, App, {_, _, _}} <- Apps0],
292    wxListBox:clear(LBox),
293    wxListBox:appendStrings(LBox, [App || App <- lists:sort(Apps)]),
294    case Apps of
295	[App|_] when Curr0 =:= undefined ->
296	    Curr = list_to_atom(App),
297	    appmon_info:app(Pid, Curr, true, []),
298	    {noreply, State#state{current=Curr}};
299	_ ->
300	    {noreply, State}
301    end;
302handle_info({delivery, _Pid, app, _Curr, {[], [], [], []}},
303	    State = #state{panel=Panel}) ->
304    wxWindow:refresh(Panel),
305    {noreply, State#state{app=undefined, sel=undefined}};
306
307handle_info({delivery, Pid, app, Curr, AppData},
308	    State = #state{panel=Panel, appmon=Pid, current=Curr, usegc=UseGC,
309			   app_w=AppWin, paint=#paint{font=Font}}) ->
310    GC = if UseGC -> {?wxGC:create(AppWin), false};
311	    true ->  {false, wxWindowDC:new(AppWin)}
312	 end,
313    setFont(GC, Font, {0,0,0}),
314    App = build_tree(AppData, GC),
315    destroy_gc(GC),
316    setup_scrollbar(AppWin, App),
317    wxWindow:refresh(Panel),
318    wxWindow:layout(Panel),
319    {noreply, State#state{app=App, sel=undefined}};
320
321handle_info({'EXIT', _, noconnection}, State) ->
322    {noreply, State};
323handle_info({'EXIT', _, normal}, State) ->
324    {noreply, State};
325handle_info(_Event, State) ->
326    %% io:format("~p:~p: ~tp~n",[?MODULE,?LINE,_Event]),
327    {noreply, State}.
328
329%%%%%%%%%%
330terminate(_Event, _State) ->
331    ok.
332code_change(_, _, State) ->
333    State.
334
335handle_mouse_click(Node = {#box{s1=#str{pid=Pid}},_}, Type,
336		   State=#state{app_w=AppWin,panel=Panel}) ->
337    case Type of
338	left_dclick -> observer ! {open_link, Pid};
339	right_down  -> popup_menu(Panel);
340	_ ->           ok
341    end,
342    observer_wx:set_status(io_lib:format("Pid: ~p", [Pid])),
343    wxWindow:refresh(AppWin),
344    State#state{sel=Node};
345handle_mouse_click(_, _, State = #state{sel=undefined}) ->
346    State;
347handle_mouse_click(_, right_down, State=#state{panel=Panel}) ->
348    popup_menu(Panel),
349    State;
350handle_mouse_click(_, _, State=#state{app_w=AppWin}) ->
351    observer_wx:set_status(""),
352    wxWindow:refresh(AppWin),
353    State#state{sel=undefined}.
354
355%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
356
357create_menus(Parent, _) ->
358    MenuEntries =
359	[{"File",
360	  [#create_menu{id=?ID_PROC_INFO, text="Process info"},
361	   #create_menu{id=?ID_PROC_MSG,  text="Send Msg"},
362	   #create_menu{id=?ID_PROC_KILL, text="Kill process"}
363	  ]},
364	 {"Trace",
365	  [#create_menu{id=?ID_TRACE_PID,  text="Trace process"},
366	   #create_menu{id=?ID_TRACE_NAME, text="Trace named process"},
367	   #create_menu{id=?ID_TRACE_TREE_PIDS,  text="Trace process tree"},
368	   #create_menu{id=?ID_TRACE_TREE_NAMES,  text="Trace named process tree"}
369	  ]}],
370    observer_wx:create_menus(Parent, MenuEntries).
371
372popup_menu(Panel) ->
373    Menu = wxMenu:new(),
374    wxMenu:append(Menu, ?ID_PROC_INFO,  "Process info"),
375    wxMenu:append(Menu, ?ID_TRACE_PID,  "Trace process"),
376    wxMenu:append(Menu, ?ID_TRACE_NAME, "Trace named process"),
377    wxMenu:append(Menu, ?ID_TRACE_TREE_PIDS, "Trace process tree"),
378    wxMenu:append(Menu, ?ID_TRACE_TREE_NAMES, "Trace named process tree"),
379    wxMenu:append(Menu, ?ID_PROC_MSG,   "Send Msg"),
380    wxMenu:append(Menu, ?ID_PROC_KILL,  "Kill process"),
381    wxWindow:popupMenu(Panel, Menu),
382    wxMenu:destroy(Menu).
383
384%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
385locate_node(X, _Y, [{Box=#box{x=BX}, _Chs}|_Rest])
386  when X < BX ->
387    {left, Box};
388locate_node(X,Y, [Node={Box=#box{x=BX,y=BY,w=BW,h=BH}, _Chs}|Rest])
389  when X =< (BX+BW)->
390    if
391	Y < BY -> {above, Box}; %% Above
392	Y =< (BY+BH) -> Node;
393	true -> locate_node(X,Y,Rest)
394    end;
395locate_node(X,Y, [{_, Chs}|Rest]) ->
396    case locate_node(X,Y,Chs) of
397	Node = {#box{},_} -> Node;
398	_Miss ->
399	    locate_node(X,Y,Rest)
400    end;
401locate_node(_, _, []) -> false.
402
403locate_box(From, [{Box=#box{s1=#str{pid=From}},_}|_]) -> Box;
404locate_box(From, [{_,Chs}|Rest]) ->
405    case locate_box(From, Chs) of
406	Box = #box{} -> Box;
407	_ -> locate_box(From, Rest)
408    end;
409locate_box(From, []) -> {false, From}.
410
411%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
412
413build_tree({Root, P2Name, Links, XLinks0}, FontW) ->
414    Fam = sofs:relation_to_family(sofs:relation(Links)),
415    Name2P = gb_trees:from_orddict(lists:sort([{Name,Pid} || {Pid,Name} <- P2Name])),
416    Lookup = gb_trees:from_orddict(sofs:to_external(Fam)),
417    {_, Tree0} = build_tree2(Root, Lookup, Name2P, FontW),
418    {Tree, Dim} = calc_tree_size(Tree0),
419    Fetch = fun({From, To}, Acc) ->
420		    try {value, ToPid} = gb_trees:lookup(To, Name2P),
421			 FromPid = gb_trees:get(From, Name2P),
422			 [{locate_box(FromPid, [Tree]),locate_box(ToPid, [Tree])}|Acc]
423		    catch _:_ ->
424			    Acc
425		    end
426	    end,
427    XLinks = lists:foldl(Fetch, [], XLinks0),
428    #app{ptree=Tree, dim=Dim, links=XLinks}.
429
430build_tree2(Root, Tree0, N2P, FontW) ->
431    case gb_trees:lookup(Root, Tree0) of
432	none -> {Tree0, {box(Root, N2P, FontW), []}};
433	{value, Children} ->
434	    Tree1 = gb_trees:delete(Root, Tree0),
435	    {Tree, CHs} = lists:foldr(fun("port " ++_, Acc) ->
436					      Acc; %% Skip ports
437					 (Child,{T0, Acc}) ->
438					      {T, C} = build_tree2(Child, T0, N2P, FontW),
439					      {T, [C|Acc]}
440				      end, {Tree1, []}, Children),
441	    {Tree, {box(Root, N2P, FontW), CHs}}
442    end.
443
444calc_tree_size(Tree) ->
445    Cols = calc_col_start(Tree, [0]),
446    {Boxes,{W,Hs}} = calc_tree_size(Tree, Cols, ?BB_X, [?BB_Y]),
447    {Boxes, {W,lists:max(Hs)}}.
448
449calc_col_start({#box{w=W}, Chs}, [Max|Acc0]) ->
450    Acc = if Acc0 == [] -> [0]; true -> Acc0 end,
451    Depth = lists:foldl(fun(Child, MDepth) -> calc_col_start(Child, MDepth) end,
452			Acc, Chs),
453    [max(W,Max)|Depth].
454
455calc_tree_size({Box=#box{w=W,h=H}, []}, _, X, [Y|Ys]) ->
456    {{Box#box{x=X,y=Y}, []}, {X+W+?BB_X,[Y+H+?BB_Y|Ys]}};
457calc_tree_size({Box, Children}, [Col|Cols], X, [H0|Hs0]) ->
458    Hs1 = calc_row_start(Children, H0, Hs0),
459    StartX = X+Col+?BB_X,
460    {Boxes, {W,Hs}} = calc_tree_sizes(Children, Cols, StartX, StartX, Hs1, []),
461    Y = middle(Boxes, H0),
462    H = Y+Box#box.h+?BB_Y,
463    {{Box#box{x=X,y=Y}, Boxes}, {W,[H|Hs]}}.
464
465calc_tree_sizes([Child|Chs], Cols, X0, W0, Hs0, Acc) ->
466    {Tree, {W,Hs}} = calc_tree_size(Child, Cols, X0, Hs0),
467    calc_tree_sizes(Chs, Cols, X0, max(W,W0), Hs, [Tree|Acc]);
468calc_tree_sizes([], _, _, W,Hs, Acc) ->
469    {lists:reverse(Acc), {W,Hs}}.
470
471calc_row_start(Chs = [{#box{h=H},_}|_], Start, Hs0) ->
472    NChs = length(Chs),
473    Wanted = (H*NChs + ?BB_Y*(NChs-1)) div 2 - H div 2,
474    case Hs0 of
475	[] -> [max(?BB_Y, Start - Wanted)];
476	[Next|Hs] ->
477	    [max(Next, Start - Wanted)|Hs]
478    end.
479
480middle([], Y) -> Y;
481middle([{#box{y=Y}, _}], _) -> Y;
482middle([{#box{y=Y0},_}|List], _) ->
483    {#box{y=Y1},_} = lists:last(List),
484    (Y0+Y1) div 2.
485
486box(Str0, N2P, FontW) ->
487    Pid = gb_trees:get(Str0, N2P),
488    Str = if hd(Str0) =:= $< -> lists:append(io_lib:format("~w", [Pid]));
489	     true -> Str0
490	  end,
491    {TW,TH} = getTextExtent(FontW, Str),
492    Data = #str{text=Str, x=?BX_HE, y=?BY_HE, pid=Pid},
493    %% Add pid
494    #box{w=round(TW)+?BX_E, h=round(TH)+?BY_E, s1=Data}.
495
496box_to_pid(#box{s1=#str{pid=Pid}}) -> Pid.
497box_to_reg(#box{s1=#str{text=[$<|_], pid=Pid}}) -> Pid;
498box_to_reg(#box{s1=#str{text=Name}}) -> list_to_atom(Name).
499
500tree_map({Box, Chs}, Fun) ->
501    tree_map(Chs, Fun, [Fun(Box)]).
502tree_map([{Box, Chs}|Rest], Fun, Acc0) ->
503    Acc = tree_map(Chs, Fun, [Fun(Box)|Acc0]),
504    tree_map(Rest, Fun, Acc);
505tree_map([], _ , Acc) -> Acc.
506
507%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
508draw(_DC, undefined, _, _) ->
509    ok;
510draw(DC, #app{dim={_W,_H}, ptree=Tree, links=Links}, Sel,
511     #paint{font=Font, pen=Pen, brush=Brush, links=LPen, sel=SelBrush}) ->
512    setPen(DC, LPen),
513    [draw_xlink(Link, DC) || Link <- Links],
514    setPen(DC, Pen),
515    %% ?wxGC:drawRectangle(DC, 2,2, _W-2,_H-2), %% DEBUG
516    setBrush(DC, Brush),
517    setFont(DC, Font, {0,0,0}),
518    draw_tree(Tree, root, DC),
519    case Sel of
520	undefined -> ok;
521	{#box{x=X,y=Y,w=W,h=H,s1=Str1}, _} ->
522	    setBrush(DC, SelBrush),
523	    drawRoundedRectangle(DC, X-1,Y-1, W+2,H+2, 8.0),
524	    draw_str(DC, Str1, X, Y)
525    end.
526
527draw_tree({Box=#box{x=X,y=Y,w=W,h=H,s1=Str1}, Chs}, Parent, DC) ->
528    drawRoundedRectangle(DC, X,Y, W,H, 8.0),
529    draw_str(DC, Str1, X, Y),
530    Dot = case Chs of
531	      [] -> ok;
532	      [{#box{x=CX0},_}|_] ->
533		  CY = Y+(H div 2),
534		  CX = CX0-(?BB_X div 2),
535		  strokeLine(DC, X+W, CY, CX, CY),
536		  {CX, CY}
537	  end,
538    draw_link(Parent, Box, DC),
539    [draw_tree(Child, Dot, DC) || Child <- Chs].
540
541draw_link({CX,CY}, #box{x=X,y=Y0,h=H}, DC) ->
542    Y = Y0+(H div 2),
543    case Y =:= CY of
544	true ->
545	    strokeLine(DC, CX, CY, X, CY);
546	false ->
547	    strokeLines(DC, [{CX, CY}, {CX, Y}, {X,Y}])
548    end;
549draw_link(_, _, _) -> ok.
550
551draw_xlink({#box{x=X0, y=Y0, h=BH}, #box{x=X1, y=Y1}}, DC)
552  when X0 =:= X1 ->
553    draw_xlink(X0,Y0,X1,Y1,BH,DC);
554draw_xlink({#box{x=X0, y=Y0, h=BH, w=BW}, #box{x=X1, y=Y1}}, DC)
555  when X0 < X1 ->
556    draw_xlink(X0+BW,Y0,X1,Y1,BH,DC);
557draw_xlink({#box{x=X0, y=Y0, h=BH}, #box{x=X1, w=BW, y=Y1}}, DC)
558  when X0 > X1 ->
559    draw_xlink(X1+BW,Y1,X0,Y0,BH,DC);
560draw_xlink({_From, _To}, _DC) ->
561    ignore.
562draw_xlink(X0, Y00, X1, Y11, BH, DC) ->
563    {Y0,Y1} = if Y00 < Y11 -> {Y00+BH-6, Y11+6};
564		 true -> {Y00+6, Y11+BH-6}
565	      end,
566    strokeLines(DC, [{X0,Y0}, {X0+5,Y0}, {X1-5,Y1}, {X1,Y1}]).
567
568draw_str(DC, #str{x=Sx,y=Sy, text=Text}, X, Y) ->
569    drawText(DC, Text, X+Sx,Y+Sy);
570draw_str(_, _, _, _) -> ok.
571