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