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/*
* SPL - The SPL Programming Language
* Copyright (C) 2004, 2005 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* mod_wsf_switch.spl: A WSF Component for switching between other components
*/
/**
* This module implements a WSF Component for switching between
* components. Usually this is used for navigating between different
* dialogs.
*/
load "wsf";
/**
* This WSF Component provides an easy infrastructure for switching between
* components. In most cases, one will derive another object from this
* one and use that instead.
*
* The children["content"] (see [[wsf:WsfComponent.children]]) contains the
* current content of this component. Additional children may be defined and
* are not handled specially by this component.
*
* An example:
*
* object Foobar WsfSwitch
* {
* var cases = [
* [ 'title' => 'Goto Demo A',
* 'code' => function()
* { return new WsfDisplay("Demo A"); }
* ],
* [ 'title' => 'Goto Demo B',
* 'code' => function()
* { return new WsfDisplay("Demo B"); }
* ]
* ];
*
* method get_html() {
* switch_reset();
* return
* <>
* <div id="$id">
* <spl:foreach var="i" list="cases">
* <a ${switch_href(i)}>${cases[i].title}</a>
* </spl:foreach>
* $( if (declared children["content"])
* return children["content"].get_html_cached(); )
* </div>
* </>;
* }
* }
*
* This Object is derived from [[wsf:WsfComponent]].
*/
object WsfSwitch WsfComponent
{
/**
* This variable is a hash or array of the possible choices.
*
* Each element is a hash and has an element with the key 'code' which
* is a function pointer. This function must return the new component
* which should replace the current children["content"].
*
* Additional keys might be defined in addition to the 'code' key.
* Usually keys such as 'title' or 'admin_only' are added.
*
* This object creates the key 'isactive' to store information about
* a choice beeing given the user and later only allows the user
* entering those choices.
*/
var cases;
/**
* Overloaded [[wsf:WsfComponent.main()]].
*/
method main() {
while (1) {
task_co_return();
if (declared cgi.param.switch and declared cases.[cgi.param.switch].isactive)
switch_code(cases.[cgi.param.switch].code);
}
}
/**
* This method is executed when one of the choices are selected. But
* it is also possible to call this method from outside and so forcing
* a switch to another component (possibly not in the choices given
* by the elements of the [[.cases]] variable).
*/
method switch_code(code)
{
var destory_function;
if (declared children.["content"].destroy)
destory_function = children.["content"].destroy;
delete children.["content"];
children.["content"] = code();
dirty = 1;
// this could kill the running task. so we need to do it
// as last thing...
if (defined destory_function)
destory_function();
}
/**
* Used to add the href attriuted in a link to one of the choices.
* See the generic description of this object [[WsfSwitch]] for a
* usage example.
*/
method switch_href(i) {
var cases.[i].isactive = 1;
return add_href("${cgi.url}?sid=${sid}&switch=$i");
}
/**
* Reset the 'isactive' flags (see [[.cases]]).
*
* This should be called by the get_html() method in derived
* objects. (see [[wsf:WsfComponent.get_html()]])
*/
method switch_reset() {
foreach i (cases)
delete cases.[i].isactive;
}
}
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