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Diffstat (limited to 'lib/gs/examples/calc.erl')
| -rw-r--r-- | lib/gs/examples/calc.erl | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/gs/examples/calc.erl b/lib/gs/examples/calc.erl new file mode 100644 index 0000000000..992b8adb4e --- /dev/null +++ b/lib/gs/examples/calc.erl @@ -0,0 +1,108 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 1996-2009. 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% +%% + +%% +%% ------------------------------------------------------------ +%% A Simple Calculator demo in Erlang +%% ------------------------------------------------------------ + +-module(calc). + +-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,'+'). + +%% ------------------------------------------------------------ |