Add a VSlider to multiline Entries

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

diff --git a/source/text.cpp b/source/text.cpp
index 5fc546c21dfe30a0c2eb9eb30662703490bf0c7e..1b465120a31d5b5b50ff699969c646aaa5f625a8 100644 (file)
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -15,6 +15,19 @@ using namespace std;
 namespace Msp {
 namespace GLtk {
 
+struct Text::RenderData
+{
+       GL::PrimitiveBuilder *bld;
+};
+
+struct Text::CoordsToGeomData
+{
+       unsigned row;
+       unsigned col;
+       Geometry result;
+};
+
+
 Text::Text():
        style(0)
 { }
@@ -126,7 +139,7 @@ unsigned Text::coords_to_offset(unsigned row, unsigned col) const
        return lines[row].start+min(col, lines[row].length);
 }
 
-Geometry Text::coords_to_geometry(unsigned row, unsigned col) const
+Geometry Text::coords_to_geometry(const Part &part, const Geometry &parent, unsigned first_row, unsigned row, unsigned col) const
 {
        if(row>=lines.size())
                row = lines.size()-1;
@@ -134,55 +147,28 @@ Geometry Text::coords_to_geometry(unsigned row, unsigned col) const
        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);
+       CoordsToGeomData data;
+       data.row = row;
+       data.col = col;
 
-       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;
+       process_lines<CoordsToGeomData, &Text::coords_to_geom_line>(part, parent, first_row, data);
 
-       return geom;
+       return data.result;
 }
 
-void Text::render(const Part &part, const Geometry &geom) const
+void Text::render(const Part &part, const Geometry &parent, unsigned first_row) const
 {
        if(lines.empty())
                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 = 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 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 Line &line = lines[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());
-
-               GL::push_matrix();
-               GL::translate(rgeom.x, rgeom.y, 0);
-               GL::scale_uniform(font_size);
 
-               font->draw_string(text.substr(line.start, line.length), imm);
+       RenderData data;
+       data.bld = &imm;
 
-               GL::pop_matrix();
-       }
+       process_lines<RenderData, &Text::render_line>(part, parent, first_row, data);
 }
 
 Text &Text::operator=(const string &t)
@@ -212,5 +198,57 @@ void Text::find_lines()
        }
 }
 
+template<typename T, void (Text::*func)(unsigned, const Geometry &, T &) const>
+void Text::process_lines(const Part &part, const Geometry &parent, unsigned first_row, T &data) 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 = 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 n_lines = min(lines.size(), (parent.h-margin.top-margin.bottom)/line_spacing);
+       first_row = min(first_row, lines.size()-n_lines);
+
+       for(unsigned i=0; i<n_lines; ++i)
+       {
+               const Line &line = lines[first_row+i];
+
+               Geometry rgeom;
+               rgeom.w = line.width;
+               rgeom.h = height;
+               rgeom.y = (n_lines-1-i)*line_spacing+y_offset;
+               part.get_alignment().apply(rgeom, parent, part.get_margin());
+
+               (this->*func)(first_row+i, rgeom, data);
+       }
+}
+
+void Text::render_line(unsigned i, const Geometry &rgeom, RenderData &data) const
+{
+       const Line &line = lines[i];
+       const GL::Font *font = style->get_font();
+
+       GL::PushMatrix _pushm;
+       GL::translate(rgeom.x, rgeom.y, 0);
+       GL::scale_uniform(font->get_default_size());
+
+       font->draw_string(text.substr(line.start, line.length), *data.bld);
+}
+
+void Text::coords_to_geom_line(unsigned i, const Geometry &rgeom, CoordsToGeomData &data) const
+{
+       if(i==data.row)
+       {
+               const Line &line = lines[i];
+               const GL::Font *font = style->get_font();
+
+               data.result = rgeom;
+               data.result.x += static_cast<unsigned>(font->get_string_width(text.substr(line.start, data.col))*font->get_default_size());
+       }
+}
+
 } // namespace GLtk
 } // namespace Msp