source/entry.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/matrix.h>
   9 #include <msp/gl/texture.h>
  10 #include <msp/gl/transform.h>
  11 #include <msp/input/keys.h>
  12 #include "entry.h"
  13 #include "graphic.h"
  14 #include "part.h"
  15 #include "style.h"
  16 #include "vslider.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace GLtk {
  22
  23 Entry::Entry(const Resources &r, const string &t):
  24         Widget(r),
  25         Container(r),
  26         text(),
  27         multiline(false),
  28         edit_pos(0),
  29         first_row(0),
  30         text_part(0),
  31         slider(0)
  32 {
  33         update_style();
  34         set_text(t);
  35 }
  36
  37 void Entry::set_text(const string &t)
  38 {
  39         text = t;
  40         edit_pos = text.size();
  41 }
  42
  43 void Entry::set_multiline(bool m)
  44 {
  45         multiline = m;
  46         if(multiline && !slider)
  47         {
  48                 slider = new VSlider(res);
  49                 add(*slider);
  50                 slider->set_step(1);
  51                 slider->signal_value_changed.connect(sigc::mem_fun(this, &Entry::slider_value_changed));
  52                 reposition_slider();
  53         }
  54 }
  55
  56 void Entry::key_press(unsigned key, unsigned, wchar_t ch)
  57 {
  58         if(key==Input::KEY_LEFT)
  59         {
  60                 if(edit_pos>0)
  61                 {
  62                         --edit_pos;
  63                         check_view_range();
  64                 }
  65         }
  66         else if(key==Input::KEY_RIGHT)
  67         {
  68                 if(edit_pos<text.size())
  69                 {
  70                         ++edit_pos;
  71                         check_view_range();
  72                 }
  73         }
  74         else if(key==Input::KEY_DOWN && multiline)
  75         {
  76                 unsigned row, col;
  77                 text.offset_to_coords(edit_pos, row, col);
  78                 edit_pos = text.coords_to_offset(row+1, col);
  79                 check_view_range();
  80         }
  81         else if(key==Input::KEY_UP && multiline)
  82         {
  83                 unsigned row, col;
  84                 text.offset_to_coords(edit_pos, row, col);
  85                 if(row>0)
  86                 {
  87                         edit_pos = text.coords_to_offset(row-1, col);
  88                         check_view_range();
  89                 }
  90                 else
  91                         edit_pos = 0;
  92         }
  93         else if(key==Input::KEY_BACKSPACE)
  94         {
  95                 if(edit_pos>0)
  96                 {
  97                         text.erase(--edit_pos, 1);
  98                         check_view_range();
  99                 }
 100         }
 101         else if(key==Input::KEY_ENTER)
 102         {
 103                 if(multiline)
 104                 {
 105                         text.insert(edit_pos++, "\n");
 106                         check_view_range();
 107                 }
 108                 else
 109                         signal_enter.emit();
 110         }
 111         else if(ch>=' ')
 112         {
 113                 text.insert(edit_pos, Codecs::encode<Codecs::Utf8>(Codecs::ustring(1, ch)));
 114                 ++edit_pos;
 115         }
 116 }
 117
 118 void Entry::render_special(const Part &part) const
 119 {
 120         if(part.get_name()=="text")
 121                 text.render(part, geom, first_row);
 122         else if(part.get_name()=="cursor")
 123         {
 124                 if(!text_part || !part.get_graphic(state))
 125                         return;
 126
 127                 unsigned row, col;
 128                 text.offset_to_coords(edit_pos, row, col);
 129
 130                 if(row<first_row || row>=first_row+visible_rows)
 131                         return;
 132
 133                 Geometry rgeom = text.coords_to_geometry(*text_part, geom, first_row, row, col);
 134
 135                 GL::push_matrix();
 136                 GL::translate(rgeom.x, rgeom.y, 0);
 137                 part.get_graphic(state)->render(part.get_geometry().w, part.get_geometry().h);
 138                 GL::pop_matrix();
 139         }
 140         else if(part.get_name()=="slider")
 141                 slider->render();
 142 }
 143
 144 void Entry::on_geometry_change()
 145 {
 146         reposition_slider();
 147 }
 148
 149 void Entry::on_style_change()
 150 {
 151         text_part = 0;
 152         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 153                 if(i->get_name()=="text")
 154                         text_part = &*i;
 155
 156         text.set_style(style);
 157         reposition_slider();
 158 }
 159
 160 void Entry::reposition_slider()
 161 {
 162         if(!slider)
 163                 return;
 164
 165         for(list<Part>::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
 166                 if(i->get_name()=="slider")
 167                 {
 168                         Geometry sgeom = i->get_geometry();
 169                         i->get_alignment().apply(sgeom, geom, i->get_margin());
 170                         slider->set_geometry(sgeom);
 171                 }
 172 }
 173
 174 void Entry::slider_value_changed(double value)
 175 {
 176         if(text.get_n_lines()>visible_rows)
 177                 first_row = text.get_n_lines()-visible_rows-static_cast<unsigned>(value);
 178 }
 179
 180 void Entry::check_view_range()
 181 {
 182         if(!multiline || !text_part)
 183                 return;
 184
 185         const GL::Font *font = style->get_font();
 186         float font_size = font->get_default_size();
 187         unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
 188
 189         const Sides &margin = text_part->get_margin();
 190         visible_rows = (geom.h-margin.top-margin.bottom)/line_spacing;
 191
 192         unsigned row, col;
 193         text.offset_to_coords(edit_pos, row, col);
 194
 195         if(first_row>row)
 196                 first_row = row;
 197         else if(row>=first_row+visible_rows)
 198                 first_row = row+1-visible_rows;
 199
 200         if(slider)
 201         {
 202                 unsigned scroll = max(text.get_n_lines(), visible_rows)-visible_rows;
 203                 slider->set_range(0, scroll);
 204                 slider->set_value(scroll-first_row);
 205         }
 206 }
 207
 208
 209 Entry::Loader::Loader(Entry &ent):
 210         Widget::Loader(ent)
 211 { }
 212
 213 } // namespace GLtk
 214 } // namespace Msp