Support multiline text editing

[libs/gltk.git] / source / text.cpp

diff --git a/source/text.cpp b/source/text.cpp
index e4ec3290ac91ee551931d6444e27f4aeb86d64ef..d18d7b5ba6c03fc233026afd178220d30b2babe0 100644 (file)
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -1,3 +1,10 @@
+/* $Id$
+
+This file is part of libmspgltk
+Copyright © 2009-2010  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
 #include <msp/gl/immediate.h>
 #include <msp/gl/matrix.h>
 #include "style.h"
@@ -8,16 +15,25 @@ using namespace std;
 namespace Msp {
 namespace GLtk {
 
-Text::Text(const Style *const &s):
-       style(s)
+Text::Text():
+       style(0)
 { }
 
-Text::Text(const Style *const &s, const string &t):
-       style(s)
+Text::Text(const Style &s, const string &t):
+       style(&s)
 {
        set(t);
 }
 
+void Text::set_style(const Style *s)
+{
+       style = s;
+
+       float font_size=style->get_font()->get_default_size();
+       for(vector<Line>::iterator i=lines.begin(); i!=lines.end(); ++i)
+               i->width=static_cast<unsigned>(style->get_font()->get_string_width(text.substr(i->start, i->length))*font_size);
+}
+
 unsigned Text::get_width() const
 {
        unsigned width=0;
@@ -38,33 +54,100 @@ 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();
+       }
+}
+
+unsigned Text::get_line_length(unsigned i) const
+{
+       if(i>=lines.size())
+               throw InvalidParameterValue("Invalid line number");
+       return lines[i].length;
+}
+
+void Text::offset_to_coords(unsigned offs, unsigned &row, unsigned &col) const
+{
+       if(lines.empty())
+       {
+               row=0;
+               col=0;
+               return;
+       }
+
+       for(unsigned i=0; i<lines.size(); ++i)
+               if(offs>=lines[i].start && offs<=lines[i].start+lines[i].length)
+               {
+                       row=i;
+                       col=offs-lines[i].start;
+                       return;
+               }
+}
+
+unsigned Text::coords_to_offset(unsigned row, unsigned col) const
+{
+       if(row>=lines.size())
+               return text.size();
+
+       return lines[row].start+min(col, lines[row].length);
+}
+
+Geometry Text::coords_to_geometry(unsigned row, unsigned col) const
+{
+       if(row>=lines.size())
+               row=lines.size()-1;
+       const Line &line=lines[row];
+       if(col>line.length)
+               col=line.length;
+
+       const GL::Font *font=style->get_font();
+       float font_size=font->get_default_size();
+       unsigned line_height=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
+       unsigned line_spacing=static_cast<unsigned>(font_size*6/5);
+       unsigned height=line_height+(lines.size()-1)*line_spacing;
+       int y_offset=static_cast<int>(-font->get_descent()*font_size);
+
+       Geometry geom;
+       geom.w=line.width;
+       geom.h=height;
+       geom.x=static_cast<unsigned>(font->get_string_width(text.substr(line.start, col))*font_size);
+       geom.y=(lines.size()-1-row)*line_spacing+y_offset;
+
+       return geom;
 }
 
 void Text::render(const Part &part, const Geometry &geom) const
@@ -75,7 +158,7 @@ void Text::render(const Part &part, const Geometry &geom) const
        const GL::Font *font=style->get_font();
        float font_size=font->get_default_size();
        unsigned line_height=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
-       unsigned line_spacing=font_size*6/5;
+       unsigned line_spacing=static_cast<unsigned>(font_size*6/5);
        unsigned height=line_height+(lines.size()-1)*line_spacing;
        int y_offset=static_cast<int>(-font->get_descent()*font_size);
 
@@ -108,5 +191,26 @@ 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