| # File src/library/grid/R/edit.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2012 The R Core Team |
| # |
| # 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. |
| # |
| # A copy of the GNU General Public License is available at |
| # https://www.R-project.org/Licenses/ |
| |
| # All args just used as args to editGrob |
| gEdit <- function(...) { |
| edit <- list(...) |
| class(edit) <- "gEdit" |
| edit |
| } |
| |
| is.gEdit <- function(x) { |
| inherits(x, "gEdit") |
| } |
| |
| applyEdit <- function(x, edit) { |
| if (is.null(edit)) { |
| x |
| } else { |
| if (!is.gEdit(edit)) |
| stop("invalid 'edit' information") |
| # Intended to handle whether edit has gPath spec or not |
| newx <- do.call("editGrob", c(list(x), edit)) |
| # If edit was specified for non-existent child, newx will be NULL |
| if (is.null(newx)) |
| x |
| else |
| newx |
| } |
| } |
| |
| # A list of gEdit's to apply to the same grob |
| gEditList <- function(...) { |
| edits <- list(...) |
| if (!all(sapply(edits, is.gEdit))) |
| stop("'gEditList' can only contain 'gEdit' objects") |
| class(edits) <- "gEditList" |
| edits |
| } |
| |
| is.gEditList <- function(x) { |
| inherits(x, "gEditList") |
| } |
| |
| applyEdits <- function(x, edits) { |
| if (is.null(edits)) { |
| x |
| } else { |
| if (is.gEdit(edits)) |
| applyEdit(x, edits) |
| else { |
| if (!inherits(edits, "gEditList")) |
| stop("invalid 'edit' information") |
| for (i in edits) |
| x <- applyEdits(x, i) |
| x |
| } |
| } |
| } |
| |