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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2011. 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%
%%
%%
%% ------------------------------------------------------------
%% A Simple Calculator demo in Erlang
%% Describes how to match against the data field.
%% ------------------------------------------------------------
-module(calc2).
-export([start/0,calc/0]).
start() ->
spawn(calc2,calc,[]).
calc() ->
I = gs:start(),
Win = gs:window(I,[{title,"Calc2"},{width,120},{height,150}]),
Lbl = gs:label(Win,[{label,{text,"0"}},{width,120}]),
gs:button(Win,[{label,{text,"1"}},{width,30},{x,0},{y,30},{data,1}]),
gs:button(Win,[{label,{text,"2"}},{width,30},{x,30},{y,30},{data,2}]),
gs:button(Win,[{label,{text,"3"}},{width,30},{x,60},{y,30},{data,3}]),
gs:button(Win,[{label,{text,"4"}},{width,30},{x,0},{y,60},{data,4}]),
gs:button(Win,[{label,{text,"5"}},{width,30},{x,30},{y,60},{data,5}]),
gs:button(Win,[{label,{text,"6"}},{width,30},{x,60},{y,60},{data,6}]),
gs:button(Win,[{label,{text,"7"}},{width,30},{x,0},{y,90},{data,7}]),
gs:button(Win,[{label,{text,"8"}},{width,30},{x,30},{y,90},{data,8}]),
gs:button(Win,[{label,{text,"9"}},{width,30},{x,60},{y,90},{data,9}]),
gs:button(Win,[{label,{text,"0"}},{width,60},{x,0},{y,120},{data,0}]),
gs:button(Win,[{label,{text,"C"}},{width,30},{x,60},{y,120},{data,'C'}]),
gs:button(Win,[{label,{text,"AC"}},{width,30},{x,90},{y,120},{data,'AC'},
{fg,red}]),
gs:button(Win,[{label,{text,"+"}},{width,30},{x,90},{y,30},{data,'+'}]),
gs:button(Win,[{label,{text,"*"}},{width,30},{x,90},{y,60},{data,'*'}]),
gs:button(Win,[{label,{text,"-"}},{width,30},{x,90},{y,90},{data,'-'}]),
gs:config(Win,{map,true}),
calc_loop(Lbl,0,0,'+').
calc_loop(Lbl,M,V,Op) ->
receive
{gs,_,click,D,_} when is_integer(D) ->
digit_press(Lbl,M,V*10+D,Op);
{gs,_,click,'C',_} ->
c(Lbl,M,V,Op);
{gs,_,click,'AC',_} ->
ac(Lbl,M,V,Op);
{gs,_,click,NewOp,_} ->
calc(Lbl,Op,M,V,NewOp);
{gs,_,destroy,_,_} ->
exit(normal);
_Other ->
calc_loop(Lbl,M,V,Op)
end.
digit_press(Lbl,M,V,Op) ->
gs:config(Lbl,[{label,{text,V}}]),
calc_loop(Lbl,M,V,Op).
calc(Lbl,'+',M,V,Op) ->
NewM = M + V,
gs:config(Lbl,[{label,{text,NewM}}]),
calc_loop(Lbl,NewM,0,Op);
calc(Lbl,'-',M,V,Op) ->
NewM = M - V,
gs:config(Lbl,[{label,{text,NewM}}]),
calc_loop(Lbl,NewM,0,Op);
calc(Lbl,'*',M,V,Op) ->
NewM = M * V,
gs:config(Lbl,[{label,{text,NewM}}]),
calc_loop(Lbl,NewM,0,Op).
c(Lbl,M,_V,Op) ->
gs:config(Lbl,[{label,{text,0}}]),
calc_loop(Lbl,M,0,Op).
ac(Lbl,_M,_V,_Op) ->
gs:config(Lbl,[{label,{text,0}}]),
calc_loop(Lbl,0,0,'+').
%% ------------------------------------------------------------
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