From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 25 Dec 2009 17:29:37 +0000 (+0000)
Subject: Handle line data when inserting/erasing text
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=62417b367503a9b26510c75e2332db21af1497bf;p=libs%2Fgltk.git

Handle line data when inserting/erasing text
---

diff --git a/source/text.cpp b/source/text.cpp
index e4ec329..e33eb80 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -38,33 +38,43 @@ unsigned Text::get_height() const
 void Text::set(const string &t)
 {
 	text=t;
-	lines.clear();
-	float font_size=style->get_font()->get_default_size();
-	string::size_type start=0;
-	while(1)
-	{
-		string::size_type newline=text.find('\n', start);
-
-		Line line;
-		line.start=start;
-		line.length=(newline==string::npos ? text.size() : newline)-start;
-		line.width=static_cast<unsigned>(style->get_font()->get_string_width(text.substr(line.start, line.length))*font_size);
-		lines.push_back(line);
-
-		if(newline==string::npos)
-			break;
-		start=newline+1;
-	}
+	find_lines();
 }
 
 void Text::erase(unsigned pos, unsigned len)
 {
 	text.erase(pos, len);
+
+	vector<Line>::iterator i;
+	for(i=lines.begin(); (i!=lines.end() && i->start+i->length<pos); ++i) ;
+
+	if(pos+len>i->start+i->length)
+		find_lines();
+	else
+	{
+		i->length-=len;
+
+		for(++i; i!=lines.end(); ++i)
+			i->start-=len;
+	}
 }
 
 void Text::insert(unsigned pos, const string &s)
 {
 	text.insert(pos, s);
+
+	if(s.find('\n')!=string::npos)
+		find_lines();
+	else
+	{
+		vector<Line>::iterator i;
+		for(i=lines.begin(); (i!=lines.end() && i->start+i->length<pos); ++i) ;
+
+		i->length+=s.size();
+
+		for(++i; i!=lines.end(); ++i)
+			i->start+=s.size();
+	}
 }
 
 void Text::render(const Part &part, const Geometry &geom) const
@@ -108,5 +118,26 @@ Text &Text::operator=(const string &t)
 	return *this;
 }
 
+void Text::find_lines()
+{
+	lines.clear();
+	float font_size=style->get_font()->get_default_size();
+	string::size_type start=0;
+	while(1)
+	{
+		string::size_type newline=text.find('\n', start);
+
+		Line line;
+		line.start=start;
+		line.length=(newline==string::npos ? text.size() : newline)-start;
+		line.width=static_cast<unsigned>(style->get_font()->get_string_width(text.substr(line.start, line.length))*font_size);
+		lines.push_back(line);
+
+		if(newline==string::npos)
+			break;
+		start=newline+1;
+	}
+}
+
 } // namespace GLtk
 } // namespace Msp
diff --git a/source/text.h b/source/text.h
index 46bd18f..5daeb9b 100644
--- a/source/text.h
+++ b/source/text.h
@@ -44,7 +44,8 @@ public:
 	void render(const Part &, const Geometry &) const;
 
 	Text &operator=(const std::string &);
-	//operator const std::string &() const { return text; }
+private:
+	void find_lines();
 };
 
 } // namespace GLtk