source/entry.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007-2011  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 string &t):
  24         text(),
  25         multiline(false),
  26         edit_pos(0),
  27         first_row(0),
  28         visible_rows(1),
  29         text_part(0),
  30         slider(0)
  31 {
  32         set_text(t);
  33 }
  34
  35 void Entry::set_text(const string &t)
  36 {
  37         text = t;
  38         edit_pos = text.size();
  39
  40         if(multiline)
  41                 check_view_range();
  42 }
  43
  44 void Entry::set_multiline(bool m)
  45 {
  46         multiline = m;
  47         if(multiline)
  48         {
  49                 if(!slider)
  50                 {
  51                         slider = new VSlider;
  52                         add(*slider);
  53                         slider->set_step(1);
  54                         slider->signal_value_changed.connect(sigc::mem_fun(this, &Entry::slider_value_changed));
  55                         reposition_slider();
  56                 }
  57                 check_view_range();
  58         }
  59 }
  60
  61 void Entry::render_special(const Part &part) const
  62 {
  63         if(part.get_name()=="text")
  64                 text.render(part, geom, first_row);
  65         else if(part.get_name()=="cursor")
  66         {
  67                 if(!text_part || !part.get_graphic(state))
  68                         return;
  69
  70                 unsigned row, col;
  71                 text.offset_to_coords(edit_pos, row, col);
  72
  73                 if(row<first_row || row>=first_row+visible_rows)
  74                         return;
  75
  76                 Geometry rgeom = text.coords_to_geometry(*text_part, geom, first_row, row, col);
  77
  78                 GL::push_matrix();
  79                 GL::translate(rgeom.x, rgeom.y, 0);
  80                 part.get_graphic(state)->render(part.get_geometry().w, part.get_geometry().h);
  81                 GL::pop_matrix();
  82         }
  83         else if(part.get_name()=="slider")
  84                 slider->render();
  85 }
  86
  87 void Entry::key_press(unsigned key, unsigned, wchar_t ch)
  88 {
  89         if(key==Input::KEY_LEFT)
  90         {
  91                 if(edit_pos>0)
  92                 {
  93                         --edit_pos;
  94                         check_view_range();
  95                 }
  96         }
  97         else if(key==Input::KEY_RIGHT)
  98         {
  99                 if(edit_pos<text.size())
 100                 {
 101                         ++edit_pos;
 102                         check_view_range();
 103                 }
 104         }
 105         else if(key==Input::KEY_DOWN && multiline)
 106         {
 107                 unsigned row, col;
 108                 text.offset_to_coords(edit_pos, row, col);
 109                 edit_pos = text.coords_to_offset(row+1, col);
 110                 check_view_range();
 111         }
 112         else if(key==Input::KEY_UP && multiline)
 113         {
 114                 unsigned row, col;
 115                 text.offset_to_coords(edit_pos, row, col);
 116                 if(row>0)
 117                 {
 118                         edit_pos = text.coords_to_offset(row-1, col);
 119                         check_view_range();
 120                 }
 121                 else
 122                         edit_pos = 0;
 123         }
 124         else if(key==Input::KEY_BACKSPACE)
 125         {
 126                 if(edit_pos>0)
 127                 {
 128                         text.erase(--edit_pos, 1);
 129                         check_view_range();
 130                 }
 131         }
 132         else if(key==Input::KEY_ENTER)
 133         {
 134                 if(multiline)
 135                 {
 136                         text.insert(edit_pos++, "\n");
 137                         check_view_range();
 138                 }
 139                 else
 140                         signal_enter.emit();
 141         }
 142         else if(ch>=' ')
 143         {
 144                 text.insert(edit_pos, Codecs::encode<Codecs::Utf8>(Codecs::ustring(1, ch)));
 145                 ++edit_pos;
 146         }
 147 }
 148
 149 void Entry::on_geometry_change()
 150 {
 151         reposition_slider();
 152
 153         if(multiline)
 154                 check_view_range();
 155 }
 156
 157 void Entry::on_style_change()
 158 {
 159         text.set_style(style);
 160
 161         if(!style)
 162         {
 163                 text_part = 0;
 164                 return;
 165         }
 166
 167         text_part = style->get_part("text");
 168
 169         reposition_slider();
 170
 171         if(multiline)
 172                 check_view_range();
 173 }
 174
 175 void Entry::reposition_slider()
 176 {
 177         if(!style || !slider)
 178                 return;
 179
 180         if(const Part *slider_part = style->get_part("slider"))
 181         {
 182                 Geometry sgeom = slider_part->get_geometry();
 183                 slider_part->get_alignment().apply(sgeom, geom, slider_part->get_margin());
 184                 slider->set_geometry(sgeom);
 185         }
 186 }
 187
 188 void Entry::check_view_range()
 189 {
 190         if(!multiline || !text_part)
 191                 return;
 192
 193         const GL::Font *font = style->get_font();
 194         float font_size = font->get_default_size();
 195         unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
 196
 197         const Sides &margin = text_part->get_margin();
 198         visible_rows = max((geom.h-margin.top-margin.bottom)/line_spacing, 1U);
 199
 200         unsigned row, col;
 201         text.offset_to_coords(edit_pos, row, col);
 202
 203         if(first_row>row)
 204                 first_row = row;
 205         else if(row>=first_row+visible_rows)
 206                 first_row = row+1-visible_rows;
 207
 208         if(slider)
 209         {
 210                 unsigned scroll = max(text.get_n_lines(), visible_rows)-visible_rows;
 211                 slider->set_range(0, scroll);
 212                 slider->set_value(scroll-first_row);
 213         }
 214 }
 215
 216 void Entry::slider_value_changed(double value)
 217 {
 218         if(text.get_n_lines()>visible_rows)
 219                 first_row = text.get_n_lines()-visible_rows-static_cast<unsigned>(value);
 220 }
 221
 222
 223 Entry::Loader::Loader(Entry &ent):
 224         Widget::Loader(ent)
 225 { }
 226
 227 } // namespace GLtk
 228 } // namespace Msp