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## Copyright (C) 2011 John Verzani
##
## 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 3 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, see <http://www.gnu.org/licenses/>.
##' @include gframe.R
NA
##' gexpandgroup A box container which can disclose or hide its
##' children through a trigger icon.
##'
##' Use \code{svalue<-} to adjust the title. The \code{visible<-}
##' method is used to programatically change whether the child
##' components are displayed.
##' @param text label text
##' @param handler Called when expanded or closed
##' @param action passed to handler
##' @param horizontal Boolean. Set to \code{TRUE} to pack children horizontally.
##' @param spacing Integer. Between child spacing.
##' @param use.scrollwindow Boolean. Set to \code{TRUE} to add a
##' scrollwindow to manage space given to child widgets. Containers
##' with scrollwindows often have their size fixed.
##' @inheritParams gwidget
##' @seealso \code{\link{ggroup}}, \code{\link{gframe}}
##' @export
##' @examples
##' w <- gwindow()
##' sb <- gstatusbar("Powered by gWidgetsWWW and Rook", cont=w)
##' g <- gexpandgroup("click to close", cont=w)
##' gbutton("some button", cont=g)
##' visible(g) <- FALSE ## to close
gexpandgroup <- function(text = "", horizontal = TRUE,
spacing=2,
use.scrollwindow=FALSE,
container=NULL,
handler = NULL, action=NULL,
...,
width=NULL,
height=NULL,
ext.args=NULL
) {
eg <- GExpandgroup$new(container, ...)
eg$init(text=text,
horizontal=horizontal,
spacing=spacing,
use.scrollwindow=FALSE,
container,
...,
width=width,
height=height,
ext.args=merge.list(list(title=text,collapsible=TRUE),
ext.args)
)
if(!is.null(handler)) {
eg$add_handler("collapse", handler, action)
eg$add_handler("expand", handler, action)
}
eg
}
GExpandgroup <- setRefClass("GExpandgroup",
contains="GFrame",
fields=list(
value="ANY",
visible="logical"
),
methods=list(
set_visible = function(value, ...) {
"Show or collapse"
if(value)
call_Ext("expand")
else
call_Ext("collapse")
..visible <<- as.logical(value)
}
))
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