%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2009. 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%
-module(tv_utils).
-export([notify/3]).
%% Minimum size of help windows
-define(wwin, 300).
-define(hwin, 180).
%% Button sizes
-define(wbut, 60).
-define(hbut, 30).
-define(pad, 10).
%----------------------------------------
% notify(S,Strings) -> ok
% S = pid() GS
% Strings = string() | [string()]
% A notification window contains a message to the user.
% Will lock the GUI until the user confirms the message by
% pressing the 'Ok' button.
%----------------------------------------
notify(S,Title,Strings) ->
W = required_width(Strings, ?wwin),
Htop = round(2 * ?hwin / 3),
Hbot = ?hwin - Htop,
%% Open a new window
Win = gs:create(window,S,[{width, W},
{height, ?hwin},
{title, Title},
{data, notifywin}
]),
%% Top frame containing a label
Top = gs:create(frame,Win,[{width, W},
{height, Htop},
{x, 0},
{y, 0},
{data, notifywin},
{keypress, true}
]),
Lbl = gs:create(label,Top,[{width,W},
{height, Htop - 2 * ?pad},
{x, 0},
{y, ?pad},
{align, c},
{justify, center},
{data, notifywin},
{keypress, true}
]),
gs:config(Lbl, {label, {text, insert_newlines(Strings)}}),
%% Bottom frame containing an 'Ok' button
Bot = gs:create(frame,Win,[{width, W},
{height, Hbot},
{x, 0},
{y, Htop}
]),
gs:create(button,Bot,[{width, ?wbut},
{height, ?hbut},
{x, W / 2 - ?wbut/2},
{y, Hbot / 2 - ?hbut / 2},
{label, {text, "OK"}},
{data, notifywin},
{keypress, true}]),
gs:config(Win, [{map,true}]),
event_loop(Win,null).
insert_newlines([String|Rest]) when is_list(String), Rest=/=[]->
String ++ "\n" ++ insert_newlines(Rest);
insert_newlines([Last]) ->
[Last];
insert_newlines(Other) ->
Other.
event_loop(Win,Entry) ->
receive
%%
%% Notify window
%%
%% 'Ok' pressed in notify window
{gs,_Obj,_Event,notifywin,["OK"|_]} ->
gs:destroy(Win),
ok;
%% 'Window manager destroy' received in notify window
{gs,_Obj,destroy,notifywin,_} ->
gs:destroy(Win),
ok;
%% 'Return' pressed in notify or confirm window
{gs,_Obj,_Event,helpwin,['Return'|_]} ->
gs:destroy(Win),
ok;
%%
%% Common or partly common events
%%
%% 'Window manager destroy' received in notify,
%% confirm,confirm_exit or request window
{gs,_Obj,destroy,_,_} ->
gs:destroy(Win),
cancel;
%% Flush any other GS events
{gs,_Obj,_Event,_Data,_Arg} ->
event_loop(Win,Entry)
end.
%----------------------------------------
% required_width(Strings,Min) -> Req
% Strings = string() | [string()]
% Min = Req = integer()
% Returns the minimum required width in pixels for a help window,
% which is the maximum of Min and the required width for Strings.
% NOTE: Font dependant really!
%----------------------------------------
required_width([First|Rest],Min) when is_list(First) ->
Req = 7*length(First), % 7 pixels per character
if
Req>Min ->
required_width(Rest,Req);
true ->
required_width(Rest,Min)
end;
required_width([],Min) ->
Min;
required_width(String,Min) ->
Req = 7*length(String),
if
Req>Min ->
Req;
true ->
Min
end.
