From 85e27a9f4678a20dc197d1f29fae3d0370e402d9 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 20 Nov 2013 19:06:51 +0200
Subject: [PATCH] Don't rebuild on state change if there are no visual changes

---
 source/style.cpp  | 19 ++++++++++++++++++-
 source/style.h    |  1 +
 source/widget.cpp |  4 +++-
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/source/style.cpp b/source/style.cpp
index 369559d..d53ae24 100644
--- a/source/style.cpp
+++ b/source/style.cpp
@@ -20,7 +20,7 @@ const GL::Font &Style::get_font() const
 
 const GL::Color &Style::get_font_color(State s) const
 {
-	if(s>N_STATES_)
+	if(s>=N_STATES_)
 		throw invalid_argument("Style::get_font_color");
 
 	return font_color[s];
@@ -35,6 +35,23 @@ const Part *Style::get_part(const string &name) const
 	return 0;
 }
 
+bool Style::compare_states(State s1, State s2) const
+{
+	if(s1>=N_STATES_ || s2>=N_STATES_)
+		throw invalid_argument("Style::compare_states");
+
+	const GL::Color &c1 = font_color[s1];
+	const GL::Color &c2 = font_color[s2];
+	if(c1.r!=c2.r || c1.g!=c2.g || c1.b!=c2.b)
+		return true;
+
+	for(PartSeq::const_iterator i=parts.begin(); i!=parts.end(); ++i)
+		if(i->get_graphic(s1)!=i->get_graphic(s2))
+			return true;
+
+	return false;
+}
+
 
 Style::Loader::Loader(Style &s, Resources &r):
 	DataFile::CollectionObjectLoader<Style, Resources>(s, &r)
diff --git a/source/style.h b/source/style.h
index 3025514..ed1de87 100644
--- a/source/style.h
+++ b/source/style.h
@@ -46,6 +46,7 @@ public:
 	const GL::Color &get_font_color(State) const;
 	const PartSeq &get_parts() const { return parts; }
 	const Part *get_part(const std::string &) const;
+	bool compare_states(State, State) const;
 };
 
 } // namespace GLtk
diff --git a/source/widget.cpp b/source/widget.cpp
index e5c58a2..8b7f1cb 100644
--- a/source/widget.cpp
+++ b/source/widget.cpp
@@ -182,8 +182,10 @@ void Widget::set_enabled(bool e)
 
 void Widget::set_state(State mask, State bits)
 {
+	State old_state = state;
 	state = (state&~mask)|bits;
-	rebuild();
+	if(style && style->compare_states(old_state, state))
+		rebuild();
 }
 
 void Widget::rebuild()
-- 
2.43.0