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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%% ------------------------------------------------------------
%% A Simple Calculator demo in Erlang
%% ------------------------------------------------------------
-module(calc).
-compile([{nowarn_deprecated_function,{gs,button,2}},
{nowarn_deprecated_function,{gs,config,2}},
{nowarn_deprecated_function,{gs,label,2}},
{nowarn_deprecated_function,{gs,start,0}},
{nowarn_deprecated_function,{gs,window,2}}]).
-export([start/0,calc/0]).
start() ->
spawn(calc,calc,[]).
calc() ->
I = gs:start(),
Win = gs:window(I,[{title,"Calc1"},{width,120},{height,150}]),
Label = gs:label(Win,[{label,{text,"0"}},{width,120}]),
B1 = gs:button(Win,[{label,{text,"1"}},{width,30},{x,0},{y,30}]),
B2 = gs:button(Win,[{label,{text,"2"}},{width,30},{x,30},{y,30}]),
B3 = gs:button(Win,[{label,{text,"3"}},{width,30},{x,60},{y,30}]),
B4 = gs:button(Win,[{label,{text,"4"}},{width,30},{x,0},{y,60}]),
B5 = gs:button(Win,[{label,{text,"5"}},{width,30},{x,30},{y,60}]),
B6 = gs:button(Win,[{label,{text,"6"}},{width,30},{x,60},{y,60}]),
B7 = gs:button(Win,[{label,{text,"7"}},{width,30},{x,0},{y,90}]),
B8 = gs:button(Win,[{label,{text,"8"}},{width,30},{x,30},{y,90}]),
B9 = gs:button(Win,[{label,{text,"9"}},{width,30},{x,60},{y,90}]),
B0 = gs:button(Win,[{label,{text,"0"}},{width,60},{x,0},{y,120}]),
C = gs:button(Win,[{label,{text,"C"}},{width,30},{x,60},{y,120}]),
AC = gs:button(Win,[{label,{text,"AC"}},{width,30},{x,90},{y,120},{fg,red}]),
Plus = gs:button(Win,[{label,{text,"+"}},{width,30},{x,90},{y,30}]),
Times = gs:button(Win,[{label,{text,"*"}},{width,30},{x,90},{y,60}]),
Minus = gs:button(Win,[{label,{text,"-"}},{width,30},{x,90},{y,90}]),
gs:config(Win,{map,true}),
Ids = [Label,B0,B1,B2,B3,B4,B5,B6,B7,B8,B9,Minus,Plus,Times,C,AC],
calc_loop(Ids,0,0,'+').
calc_loop(Ids,M,V,Op) ->
[_Label,B0,B1,B2,B3,B4,B5,B6,B7,B8,B9,Minus,Plus,Times,C,AC] = Ids,
receive
{gs,B0,click,_,_} -> digit_press(Ids,M,V*10+0,Op);
{gs,B1,click,_,_} -> digit_press(Ids,M,V*10+1,Op);
{gs,B2,click,_,_} -> digit_press(Ids,M,V*10+2,Op);
{gs,B3,click,_,_} -> digit_press(Ids,M,V*10+3,Op);
{gs,B4,click,_,_} -> digit_press(Ids,M,V*10+4,Op);
{gs,B5,click,_,_} -> digit_press(Ids,M,V*10+5,Op);
{gs,B6,click,_,_} -> digit_press(Ids,M,V*10+6,Op);
{gs,B7,click,_,_} -> digit_press(Ids,M,V*10+7,Op);
{gs,B8,click,_,_} -> digit_press(Ids,M,V*10+8,Op);
{gs,B9,click,_,_} -> digit_press(Ids,M,V*10+9,Op);
{gs,Minus,click,_,_} -> calc(Ids,Op,M,V,'-');
{gs,Plus,click,_,_} -> calc(Ids,Op,M,V,'+');
{gs,Times,click,_,_} -> calc(Ids,Op,M,V,'*');
{gs,AC,click,_,_} -> ac(Ids,M,V,Op);
{gs,C,click,_,_} -> c(Ids,M,V,Op);
{gs,_,destroy,_,_} -> exit(normal);
_Other -> calc_loop(Ids,M,V,Op)
end.
digit_press(Ids,M,V,Op) ->
[Label|_]=Ids,
gs:config(Label,[{label,{text,V}}]),
calc_loop(Ids,M,V,Op).
calc(Ids,'+',M,V,Op) ->
NewM = M + V,
[Label|_]=Ids,
gs:config(Label,[{label,{text,NewM}}]),
calc_loop(Ids,NewM,0,Op);
calc(Ids,'-',M,V,Op) ->
NewM = M - V,
[Label|_]=Ids,
gs:config(Label,[{label,{text,NewM}}]),
calc_loop(Ids,NewM,0,Op);
calc(Ids,'*',M,V,Op) ->
NewM = M * V,
[Label|_]=Ids,
gs:config(Label,[{label,{text,NewM}}]),
calc_loop(Ids,NewM,0,Op).
c(Ids,M,_V,Op) ->
[Label|_]=Ids,
gs:config(Label,[{label,{text,0}}]),
calc_loop(Ids,M,0,Op).
ac(Ids,_M,_V,_Op) ->
[Label|_]=Ids,
gs:config(Label,[{label,{text,0}}]),
calc_loop(Ids,0,0,'+').
%% ------------------------------------------------------------
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