From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/gs/examples/calc2.erl | 96 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 lib/gs/examples/calc2.erl

(limited to 'lib/gs/examples/calc2.erl')

diff --git a/lib/gs/examples/calc2.erl b/lib/gs/examples/calc2.erl
new file mode 100644
index 0000000000..d28780de01
--- /dev/null
+++ b/lib/gs/examples/calc2.erl
@@ -0,0 +1,96 @@
+%%
+%% %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
+%% 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 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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