source/dropdown.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/font.h>
   9 #include "dropdown.h"
  10 #include "list.h"
  11 #include "panel.h"
  12 #include "part.h"
  13 #include "root.h"
  14 #include "style.h"
  15 #include "text.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GLtk {
  21
  22 Dropdown::Dropdown():
  23         dropped(false)
  24 {
  25         add(list);
  26         list.signal_item_selected.connect(sigc::mem_fun(this, &Dropdown::list_item_selected));
  27         list.signal_autosize_changed.connect(sigc::mem_fun(this, &Dropdown::list_autosize_changed));
  28 }
  29
  30 void Dropdown::autosize()
  31 {
  32         if(!style)
  33                 return;
  34
  35         Widget::autosize();
  36         geom.w = max(geom.w, list.get_geometry().w);
  37
  38         if(const Part *text_part = style->get_part("text"))
  39         {
  40                 const Sides &margin = text_part->get_margin();
  41                 const GL::Font *font = style->get_font();
  42                 float font_size = font->get_default_size();
  43                 unsigned line_height = static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
  44                 geom.h = max(geom.h, line_height+margin.top+margin.bottom);
  45         }
  46 }
  47
  48 void Dropdown::append(const string &item)
  49 {
  50         list.append(item);
  51 }
  52
  53 void Dropdown::insert(unsigned i, const string &v)
  54 {
  55         list.insert(i, v);
  56 }
  57
  58 void Dropdown::remove(unsigned i)
  59 {
  60         list.remove(i);
  61 }
  62
  63 void Dropdown::clear()
  64 {
  65         list.clear();
  66 }
  67
  68 unsigned Dropdown::get_n_items() const
  69 {
  70         return list.get_n_items();
  71 }
  72
  73 void Dropdown::set_selected_index(int i)
  74 {
  75         list.set_selected_index(i);
  76 }
  77
  78 const string &Dropdown::get_selected() const
  79 {
  80         return list.get_selected();
  81 }
  82
  83 int Dropdown::get_selected_index() const
  84 {
  85         return list.get_selected_index();
  86 }
  87
  88 void Dropdown::render_special(const Part &part) const
  89 {
  90         if(part.get_name()=="text")
  91         {
  92                 if(list.get_selected_index()>=0)
  93                         Text(*style, list.get_selected()).render(part, geom);
  94         }
  95         else if(part.get_name()=="list" && dropped)
  96                 list.render();
  97 }
  98
  99 void Dropdown::button_press(int x, int y, unsigned btn)
 100 {
 101         if(dropped)
 102         {
 103                 Container::button_press(x, y, btn);
 104                 if(!click_focus)
 105                 {
 106                         dropped = false;
 107                         state &= ~ACTIVE;
 108                         signal_ungrab_pointer.emit();
 109                 }
 110         }
 111         else if(btn==1)
 112         {
 113                 dropped = true;
 114                 state |= ACTIVE;
 115                 signal_grab_pointer.emit();
 116         }
 117 }
 118
 119 void Dropdown::on_geometry_change()
 120 {
 121         resize_list();
 122 }
 123
 124 void Dropdown::on_style_change()
 125 {
 126         resize_list();
 127 }
 128
 129 void Dropdown::list_autosize_changed()
 130 {
 131         resize_list();
 132         signal_autosize_changed.emit();
 133 }
 134
 135 void Dropdown::resize_list()
 136 {
 137         list.autosize_all();
 138         Geometry lgeom = list.get_geometry();
 139         lgeom.x = 0;
 140         lgeom.y = -lgeom.h;
 141         lgeom.w = max(geom.w, lgeom.w);
 142         int root_x = geom.x;
 143         int root_y = geom.y;
 144         for(Widget *p=parent; p; p=p->get_parent())
 145         {
 146                 root_x += p->get_geometry().x;
 147                 root_y += p->get_geometry().y;
 148                 if(Root *root = dynamic_cast<Root *>(p))
 149                 {
 150                         const Geometry &rgeom = root->get_geometry();
 151                         if(lgeom.h*2>rgeom.h)
 152                                 lgeom.h = rgeom.h/2;
 153                         if(root_y+lgeom.y<0)
 154                                 lgeom.y = -root_y;
 155                         if(root_y+lgeom.y+lgeom.h>rgeom.h)
 156                                 lgeom.y = rgeom.h-lgeom.h-root_y;
 157                         if(root_x+lgeom.x+lgeom.w>rgeom.w)
 158                                 lgeom.x = rgeom.w-lgeom.w-root_x;
 159                         break;
 160                 }
 161         }
 162         list.set_geometry(lgeom);
 163 }
 164
 165 void Dropdown::list_item_selected(unsigned index, const std::string &item)
 166 {
 167         if(dropped)
 168         {
 169                 dropped = false;
 170                 state &= ~ACTIVE;
 171                 signal_ungrab_pointer.emit();
 172         }
 173
 174         signal_item_selected.emit(index, item);
 175 }
 176
 177
 178 Dropdown::Loader::Loader(Dropdown &d):
 179         Widget::Loader(d)
 180 {
 181         add("item", &Loader::item);
 182 }
 183
 184 void Dropdown::Loader::item(const string &str)
 185 {
 186         dynamic_cast<Dropdown &>(obj).append(str);
 187 }
 188
 189 } // namespace GLtk
 190 } // namespace Msp