From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 16 Jun 2013 08:26:58 +0000 (+0300)
Subject: Add some sanity checks to arrangements
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=304500a51a1a9d00e3c84ed2a6ffda0f829445b4

Add some sanity checks to arrangements
---

diff --git a/source/arrangement.h b/source/arrangement.h
index 284d3f7..ed1798b 100644
--- a/source/arrangement.h
+++ b/source/arrangement.h
@@ -2,6 +2,7 @@
 #define MSP_GLTK_ARRANGEMENT_H_
 
 #include <list>
+#include <stdexcept>
 #include "layout.h"
 
 namespace Msp {
@@ -9,6 +10,13 @@ namespace GLtk {
 
 class Widget;
 
+class arrangement_error: public std::logic_error
+{
+public:
+	arrangement_error(const std::string &w): std::logic_error(w) { }
+	virtual ~arrangement_error() throw() { }
+};
+
 class Arrangement
 {
 protected:
diff --git a/source/column.cpp b/source/column.cpp
index d31544a..811185d 100644
--- a/source/column.cpp
+++ b/source/column.cpp
@@ -12,6 +12,9 @@ Column::Column(Layout &l):
 
 void Column::split()
 {
+	if(gravity<0)
+		throw arrangement_error("already split");
+
 	split_here = true;
 	gravity = -1;
 }
diff --git a/source/grid.cpp b/source/grid.cpp
index 6296098..3b44ac8 100644
--- a/source/grid.cpp
+++ b/source/grid.cpp
@@ -17,6 +17,9 @@ void Grid::skip()
 
 void Grid::next_row()
 {
+	if(row_bottom.empty())
+		throw arrangement_error("empty row not allowed");
+
 	finish_row();
 }
 
diff --git a/source/row.cpp b/source/row.cpp
index ae13e49..92f3fe6 100644
--- a/source/row.cpp
+++ b/source/row.cpp
@@ -12,6 +12,9 @@ Row::Row(Layout &l):
 
 void Row::split()
 {
+	if(gravity>0)
+		throw arrangement_error("already split");
+
 	split_here = true;
 	gravity = 1;
 }