From 144fd10b34a885a8038cc38266cd0e188b6a4490 Mon Sep 17 00:00:00 2001
From: Johannes Ranke <jranke@uni-bremen.de>
Date: Fri, 26 Sep 2014 20:47:53 +0200
Subject: Disallow deleting the last dataset/model as this is not supported

---
 inst/GUI/gmkin.R | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

(limited to 'inst/GUI/gmkin.R')

diff --git a/inst/GUI/gmkin.R b/inst/GUI/gmkin.R
index c85d660..5932f37 100644
--- a/inst/GUI/gmkin.R
+++ b/inst/GUI/gmkin.R
@@ -311,12 +311,16 @@ copy_dataset_handler <- function(h, ...) {
 }
  
 delete_dataset_handler <- function(h, ...) {
-  ds[[ds.cur]] <<- NULL
-  names(ds) <<- as.character(1:length(ds))
-  ds.cur <<- names(ds)[[1]]
-  update_ds.df()
-  ds.gtable[,] <- ds.df
-  update_ds_editor()
+  if (length(ds) > 1) {
+    ds[[ds.cur]] <<- NULL
+    names(ds) <<- as.character(1:length(ds))
+    ds.cur <<- names(ds)[[1]]
+    update_ds.df()
+    ds.gtable[,] <- ds.df
+    update_ds_editor()
+  } else {
+    galert("Deleting the last dataset is not supported", parent = w)
+  }
 }
  
 new_dataset_handler <- function(h, ...) {
@@ -540,12 +544,16 @@ copy_model_handler <- function(h, ...) {
 }
  
 delete_model_handler <- function(h, ...) {
-  m[[m.cur]] <<- NULL
-  names(m) <<- as.character(1:length(m))
-  m.cur <<- "1"
-  update_m.df()
-  m.gtable[,] <- m.df
-  update_m_editor()
+  if (length(m) > 1) {
+    m[[m.cur]] <<- NULL
+    names(m) <<- as.character(1:length(m))
+    m.cur <<- "1"
+    update_m.df()
+    m.gtable[,] <- m.df
+    update_m_editor()
+  } else {
+    galert("Deleting the last model is not supported", parent = w)
+  }
 }
 
 add_observed_handler <- function(h, ...) {
-- 
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