X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftext.cpp;h=1d7a7930dc4bc58c695e8d2082fb5895e9598f66;hb=HEAD;hp=5f4095e135b33f65dfcb0fca73b171d19645c761;hpb=1e06dc208a02e68cf1bb127927e3ad5af3657c58;p=libs%2Fgltk.git

diff --git a/source/text.cpp b/source/text.cpp
index 5f4095e..2e4d9cb 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -1,5 +1,8 @@
-#include <msp/gl/immediate.h>
+#include <msp/core/algorithm.h>
 #include <msp/gl/matrix.h>
+#include <msp/gl/meshbuilder.h>
+#include <msp/gl/texture2d.h>
+#include "partcache.h"
 #include "style.h"
 #include "text.h"
 
@@ -8,104 +11,351 @@ using namespace std;
 namespace Msp {
 namespace GLtk {
 
-Text::Text(const Style *const &s):
-	style(s)
+struct Text::RenderData
+{
+	GL::PrimitiveBuilder *bld;
+};
+
+struct Text::CoordsToGeomData
+{
+	size_t row;
+	size_t col;
+	Geometry result;
+};
+
+
+Text::Text():
+	lines(1)
 { }
 
-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;
+
+	if(style)
+	{
+		const GL::Font &font = style->get_font();
+		float font_size = style->get_font_size();
+		for(Line &l: lines)
+			l.width = static_cast<unsigned>(font.get_string_width(text.substr(l.start, l.bytes))*font_size);
+	}
+}
+
 unsigned Text::get_width() const
 {
-	unsigned width=0;
-	for(vector<Line>::const_iterator i=lines.begin(); i!=lines.end(); ++i)
-		width=max(width, i->width);
+	unsigned width = 0;
+	for(const Line &l: lines)
+		width = max(width, l.width);
 	return width;
 }
 
 unsigned Text::get_height() 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=line_height*6/5;
+	if(!style)
+		return lines.size();
+
+	const GL::Font &font = style->get_font();
+	float font_size = style->get_font_size();
+	unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font_size);
+	unsigned line_spacing = line_height*6/5;
 	return line_height+(lines.size()-1)*line_spacing;
 }
 
+void Text::autosize(const Part &part, Geometry &geom) const
+{
+	const Sides &margin = part.get_margin();
+	geom.w = max(geom.w, get_width()+margin.left+margin.right);
+	geom.h = max(geom.h, get_height()+margin.top+margin.bottom);
+}
+
 void Text::set(const string &t)
 {
-	text=t;
+	text = t;
+	find_lines();
+}
+
+void Text::erase(size_t pos, size_t len)
+{
+	check_alignment(pos);
+	check_alignment(pos+len);
+	text.erase(pos, len);
+
+	auto i = find_if(lines, [pos](const Line &l){ return l.start+l.bytes>=pos; });
+
+	if(pos+len>i->start+i->bytes)
+		find_lines();
+	else
+	{
+		i->bytes -= len;
+		i->length = count_characters(i->start, i->bytes);
+
+		for(++i; i!=lines.end(); ++i)
+			i->start -= len;
+	}
+}
+
+void Text::insert(size_t pos, const string &s)
+{
+	check_alignment(pos);
+	text.insert(pos, s);
+
+	if(s.find('\n')!=string::npos)
+		find_lines();
+	else
+	{
+		auto i = find_if(lines, [pos](const Line &l){ return l.start+l.bytes>=pos; });
+
+		i->bytes += s.size();
+		i->length = count_characters(i->start, i->bytes);
+
+		for(++i; i!=lines.end(); ++i)
+			i->start += s.size();
+	}
+}
+
+size_t Text::get_visible_lines(const Part &part, const Geometry &parent, unsigned *fit_height) const
+{
+	const GL::Font &font = style->get_font();
+	float font_size = style->get_font_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);
+
+	const Sides &margin = part.get_margin();
+	unsigned vmargin = margin.top+margin.bottom;
+	unsigned free_height = max(parent.h, vmargin)-vmargin+line_spacing-line_height;
+	size_t n_lines = min<size_t>(lines.size(), max(free_height/line_spacing, 1U));
+	if(fit_height)
+		*fit_height = line_height+(n_lines-1)*line_spacing;
+
+	return n_lines;
+}
+
+size_t Text::get_line_length(size_t i) const
+{
+	if(i>=lines.size())
+		throw out_of_range("Text::get_line_length");
+	return lines[i].length;
+}
+
+size_t Text::move_offset(size_t offs, ptrdiff_t change) const
+{
+	check_alignment(offs);
+	if(!change)
+		return offs;
+
+	StringCodec::Utf8::Decoder dec(StringCodec::IGNORE_ERRORS);
+	auto i = text.begin()+offs;
+	if(change>0)
+	{
+		for(; change>0; --change)
+			dec.decode_char(text, i);
+	}
+	else
+	{
+		while(change<0 && i!=text.begin())
+		{
+			--i;
+			auto j = i;
+			if(dec.decode_char(text, j)!=-1)
+				++change;
+		}
+	}
+	return i-text.begin();
+}
+
+void Text::offset_to_coords(size_t offs, size_t &row, size_t &col) const
+{
+	if(lines.empty())
+	{
+		row = 0;
+		col = 0;
+		return;
+	}
+
+	for(size_t i=0; i<lines.size(); ++i)
+		if(offs>=lines[i].start && offs<=lines[i].start+lines[i].bytes)
+		{
+			row = i;
+			if(lines[i].length==lines[i].bytes)
+				col = offs-lines[i].start;
+			else
+				col = count_characters(lines[i].start, offs-lines[i].start);
+			return;
+		}
+}
+
+size_t Text::coords_to_offset(size_t row, size_t col) const
+{
+	if(row>=lines.size())
+		return text.size();
+	const Line &line = lines[row];
+	if(col>line.length)
+		col = line.length;
+
+	if(line.length==line.bytes)
+		return line.start+col;
+	else
+	{
+		StringCodec::Utf8::Decoder dec;
+		auto i = text.begin()+line.start;
+		for(col=min(col, line.length); col; --col)
+			dec.decode_char(text, i);
+		return i-text.begin();
+	}
+}
+
+Geometry Text::coords_to_geometry(const Part &part, const Geometry &parent, size_t first_row, size_t row, size_t col) const
+{
+	if(row>=lines.size())
+		row = lines.size()-1;
+	const Line &line = lines[row];
+	if(col>line.length)
+		col = line.length;
+
+	CoordsToGeomData data;
+	data.row = row;
+	data.col = col;
+
+	process_lines(part, parent, first_row, &Text::coords_to_geom_line, data);
+
+	return data.result;
+}
+
+void Text::build(const Part &part, State state, const Geometry &parent, PartCache &cache) const
+{
+	build(part, state, parent, 0, cache);
+}
+
+void Text::build(const Part &part, State state, const Geometry &parent, size_t first_row, PartCache &cache) const
+{
+	if(!style || lines.empty())
+		return;
+
+	const GL::Font &font = style->get_font();
+	GL::MeshBuilder bld(cache.create_mesh(part, font.get_texture()));
+	bld.color(style->get_font_color(state));
+
+	RenderData data;
+	data.bld = &bld;
+
+	process_lines(part, parent, first_row, &Text::build_line, data);
+}
+
+Text &Text::operator=(const string &t)
+{
+	set(t);
+	return *this;
+}
+
+void Text::find_lines()
+{
 	lines.clear();
-	float font_size=style->get_font()->get_default_size();
-	unsigned start=0;
+	float font_size = (style ? style->get_font_size() : 1);
+	string::size_type start = 0;
 	while(1)
 	{
-		unsigned newline=text.find('\n', start);
+		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);
+		line.start = start;
+		line.bytes = (newline==string::npos ? text.size() : newline)-start;
+		line.length = count_characters(line.start, line.bytes);
+		line.width = line.length;
+		if(style)
+		{
+			string str = text.substr(line.start, line.bytes);
+			line.width = static_cast<unsigned>(style->get_font().get_string_width(str)*font_size);
+		}
 		lines.push_back(line);
 
 		if(newline==string::npos)
 			break;
-		start=newline+1;
+		start = newline+1;
 	}
 }
 
-void Text::erase(unsigned pos, unsigned len)
+size_t Text::count_characters(size_t start, size_t bytes) const
 {
-	text.erase(pos, len);
+	StringCodec::Utf8::Decoder dec;
+	auto i = text.begin()+start;
+	auto end = i+bytes;
+	size_t count = 0;
+	for(; i<end; dec.decode_char(text, i))
+		++count;
+	return count;
 }
 
-void Text::insert(unsigned pos, const string &s)
+void Text::check_alignment(size_t offs) const
 {
-	text.insert(pos, s);
+	StringCodec::Utf8::Decoder dec;
+	auto i = text.begin()+offs;
+	dec.decode_char(text, i);
 }
 
-void Text::render(const Part &part, const Geometry &geom) const
+template<typename T>
+void Text::process_lines(const Part &part, const Geometry &parent, size_t first_row, void (Text::*func)(size_t, const Geometry &, T &) const, T &data) const
 {
-	if(lines.empty())
+	if(!style)
 		return;
 
-	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 height=line_height+(lines.size()-1)*line_spacing;
-	int y_offset=static_cast<int>(-font->get_descent()*font_size);
-
-	const GL::Color &color=style->get_font_color();
-	GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
-	imm.color(color.r, color.g, color.b);
-	for(unsigned i=0; i<lines.size(); ++i)
+	const GL::Font &font = style->get_font();
+	float font_size = style->get_font_size();
+	unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
+	int y_offset = static_cast<int>(-font.get_descent()*font_size);
+
+	unsigned fit_height;
+	size_t n_lines = get_visible_lines(part, parent, &fit_height);
+	first_row = min(first_row, lines.size()-n_lines);
+
+	for(size_t i=0; i<n_lines; ++i)
 	{
-		const Line &line=lines[i];
+		const Line &line = lines[first_row+i];
 
 		Geometry rgeom;
-		rgeom.w=line.width;
-		rgeom.h=height;
-		rgeom.y=(lines.size()-1-i)*line_spacing+y_offset;
-		part.get_alignment().apply(rgeom, geom, part.get_margin());
+		rgeom.w = line.width;
+		rgeom.h = fit_height;
+		rgeom.y = (n_lines-1-i)*line_spacing+y_offset;
+		part.get_alignment().apply(rgeom, parent, part.get_margin());
 
-		GL::push_matrix();
-		GL::translate(rgeom.x, rgeom.y, 0);
-		GL::scale_uniform(font_size);
+		(this->*func)(first_row+i, rgeom, data);
+	}
+}
 
-		font->draw_string(text.substr(line.start, line.length), imm);
+void Text::build_line(size_t i, const Geometry &rgeom, RenderData &data) const
+{
+	const Line &line = lines[i];
 
-		GL::pop_matrix();
-	}
+	GL::VertexBuilder::PushMatrix _pushm(*data.bld);
+	data.bld->transform(GL::Matrix::translation(rgeom.x, rgeom.y, 0));
+	data.bld->transform(GL::Matrix::scaling(style->get_font_size()));
+
+	style->get_font().build_string(text.substr(line.start, line.bytes), *data.bld);
 }
 
-Text &Text::operator=(const string &t)
+void Text::coords_to_geom_line(size_t i, const Geometry &rgeom, CoordsToGeomData &data) const
 {
-	set(t);
-	return *this;
+	if(i==data.row)
+	{
+		auto begin = text.begin()+lines[i].start;
+		auto j = begin;
+		if(lines[i].length==lines[i].bytes)
+			j += data.col;
+		else
+		{
+			StringCodec::Utf8::Decoder dec;
+			for(size_t c=data.col; c; --c)
+				dec.decode_char(text, j);
+		}
+		float w = style->get_font().get_string_width(string(begin, j));
+		data.result = rgeom;
+		data.result.x += static_cast<unsigned>(w*style->get_font_size());
+	}
 }
 
 } // namespace GLtk