X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftext.cpp;h=2e4d9cb88f4c5c0394b2edf137866dc14cbb295f;hb=aa9b8db38efb9e97460c76e27cecc4d1591b23e5;hp=1d7a7930dc4bc58c695e8d2082fb5895e9598f66;hpb=8d09cdc5e642af9a2e1210ce708790c5b41cb585;p=libs%2Fgltk.git

diff --git a/source/text.cpp b/source/text.cpp
index 1d7a793..2e4d9cb 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -1,3 +1,4 @@
+#include <msp/core/algorithm.h>
 #include <msp/gl/matrix.h>
 #include <msp/gl/meshbuilder.h>
 #include <msp/gl/texture2d.h>
@@ -17,14 +18,14 @@ struct Text::RenderData
 
 struct Text::CoordsToGeomData
 {
-	unsigned row;
-	unsigned col;
+	size_t row;
+	size_t col;
 	Geometry result;
 };
 
 
 Text::Text():
-	style(0)
+	lines(1)
 { }
 
 Text::Text(const Style &s, const string &t):
@@ -41,16 +42,16 @@ void Text::set_style(const Style *s)
 	{
 		const GL::Font &font = style->get_font();
 		float font_size = style->get_font_size();
-		for(vector<Line>::iterator i=lines.begin(); i!=lines.end(); ++i)
-			i->width = static_cast<unsigned>(font.get_string_width(text.substr(i->start, i->length))*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);
+	for(const Line &l: lines)
+		width = max(width, l.width);
 	return width;
 }
 
@@ -79,50 +80,96 @@ void Text::set(const string &t)
 	find_lines();
 }
 
-void Text::erase(unsigned pos, unsigned len)
+void Text::erase(size_t pos, size_t len)
 {
+	check_alignment(pos);
+	check_alignment(pos+len);
 	text.erase(pos, len);
 
-	vector<Line>::iterator i;
-	for(i=lines.begin(); (i!=lines.end() && i->start+i->length<pos); ++i) ;
+	auto i = find_if(lines, [pos](const Line &l){ return l.start+l.bytes>=pos; });
 
-	if(pos+len>i->start+i->length)
+	if(pos+len>i->start+i->bytes)
 		find_lines();
 	else
 	{
-		i->length -= len;
+		i->bytes -= len;
+		i->length = count_characters(i->start, i->bytes);
 
 		for(++i; i!=lines.end(); ++i)
 			i->start -= len;
 	}
 }
 
-void Text::insert(unsigned pos, const string &s)
+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
 	{
-		vector<Line>::iterator i;
-		for(i=lines.begin(); (i!=lines.end() && i->start+i->length<pos); ++i) ;
+		auto i = find_if(lines, [pos](const Line &l){ return l.start+l.bytes>=pos; });
 
-		i->length += s.size();
+		i->bytes += s.size();
+		i->length = count_characters(i->start, i->bytes);
 
 		for(++i; i!=lines.end(); ++i)
 			i->start += s.size();
 	}
 }
 
-unsigned Text::get_line_length(unsigned i) const
+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;
 }
 
-void Text::offset_to_coords(unsigned offs, unsigned &row, unsigned &col) const
+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())
 	{
@@ -131,24 +178,39 @@ void Text::offset_to_coords(unsigned offs, unsigned &row, unsigned &col) const
 		return;
 	}
 
-	for(unsigned i=0; i<lines.size(); ++i)
-		if(offs>=lines[i].start && offs<=lines[i].start+lines[i].length)
+	for(size_t i=0; i<lines.size(); ++i)
+		if(offs>=lines[i].start && offs<=lines[i].start+lines[i].bytes)
 		{
 			row = i;
-			col = offs-lines[i].start;
+			if(lines[i].length==lines[i].bytes)
+				col = offs-lines[i].start;
+			else
+				col = count_characters(lines[i].start, offs-lines[i].start);
 			return;
 		}
 }
 
-unsigned Text::coords_to_offset(unsigned row, unsigned col) const
+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;
 
-	return lines[row].start+min(col, lines[row].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, unsigned first_row, unsigned row, unsigned col) const
+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;
@@ -170,7 +232,7 @@ void Text::build(const Part &part, State state, const Geometry &parent, PartCach
 	build(part, state, parent, 0, cache);
 }
 
-void Text::build(const Part &part, State state, const Geometry &parent, unsigned first_row, PartCache &cache) const
+void Text::build(const Part &part, State state, const Geometry &parent, size_t first_row, PartCache &cache) const
 {
 	if(!style || lines.empty())
 		return;
@@ -202,11 +264,12 @@ void Text::find_lines()
 
 		Line line;
 		line.start = start;
-		line.length = (newline==string::npos ? text.size() : newline)-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.length);
+			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);
@@ -217,31 +280,46 @@ void Text::find_lines()
 	}
 }
 
+size_t Text::count_characters(size_t start, size_t bytes) const
+{
+	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::check_alignment(size_t offs) const
+{
+	StringCodec::Utf8::Decoder dec;
+	auto i = text.begin()+offs;
+	dec.decode_char(text, i);
+}
+
 template<typename T>
-void Text::process_lines(const Part &part, const Geometry &parent, unsigned first_row, void (Text::*func)(unsigned, const Geometry &, T &) const, T &data) const
+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(!style)
 		return;
 
 	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);
-	unsigned height = line_height+(lines.size()-1)*line_spacing;
 	int y_offset = static_cast<int>(-font.get_descent()*font_size);
 
-	const Sides &margin = part.get_margin();
-	unsigned fit_height = parent.h-margin.top-margin.bottom+line_spacing-line_height;
-	unsigned n_lines = min<unsigned>(lines.size(), max(fit_height/line_spacing, 1U));
-	first_row = min<unsigned>(first_row, lines.size()-n_lines);
+	unsigned fit_height;
+	size_t n_lines = get_visible_lines(part, parent, &fit_height);
+	first_row = min(first_row, lines.size()-n_lines);
 
-	for(unsigned i=0; i<n_lines; ++i)
+	for(size_t i=0; i<n_lines; ++i)
 	{
 		const Line &line = lines[first_row+i];
 
 		Geometry rgeom;
 		rgeom.w = line.width;
-		rgeom.h = height;
+		rgeom.h = fit_height;
 		rgeom.y = (n_lines-1-i)*line_spacing+y_offset;
 		part.get_alignment().apply(rgeom, parent, part.get_margin());
 
@@ -249,22 +327,32 @@ void Text::process_lines(const Part &part, const Geometry &parent, unsigned firs
 	}
 }
 
-void Text::build_line(unsigned i, const Geometry &rgeom, RenderData &data) const
+void Text::build_line(size_t i, const Geometry &rgeom, RenderData &data) const
 {
 	const Line &line = lines[i];
 
-	GL::MatrixStack::Push _pushm(data.bld->matrix());
-	data.bld->matrix() *= GL::Matrix::translation(rgeom.x, rgeom.y, 0);
-	data.bld->matrix() *= GL::Matrix::scaling(style->get_font_size());
+	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.length), *data.bld);
+	style->get_font().build_string(text.substr(line.start, line.bytes), *data.bld);
 }
 
-void Text::coords_to_geom_line(unsigned i, const Geometry &rgeom, CoordsToGeomData &data) const
+void Text::coords_to_geom_line(size_t i, const Geometry &rgeom, CoordsToGeomData &data) const
 {
 	if(i==data.row)
 	{
-		float w = style->get_font().get_string_width(text.substr(lines[i].start, data.col));
+		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());
 	}