source/dropdown.cpp

   1 #include <msp/gl/font.h>
   2 #include "dropdown.h"
   3 #include "list.h"
   4 #include "panel.h"
   5 #include "part.h"
   6 #include "root.h"
   7 #include "style.h"
   8 #include "text.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GLtk {
  14
  15 Dropdown::Dropdown()
  16 {
  17         init();
  18 }
  19
  20 Dropdown::Dropdown(ListData &d):
  21         list(d)
  22 {
  23         init();
  24 }
  25
  26 void Dropdown::init()
  27 {
  28         input_type = INPUT_NAVIGATION;
  29
  30         dropped = false;
  31
  32         add(list);
  33         list.set_visible(false);
  34         list.set_view_all();
  35         list.signal_item_selected.connect(sigc::mem_fun(this, &Dropdown::list_item_selected));
  36         list.signal_selection_cleared.connect(sigc::mem_fun(this, &Dropdown::list_selection_cleared));
  37         list.signal_autosize_changed.connect(sigc::mem_fun(this, &Dropdown::list_autosize_changed));
  38 }
  39
  40 void Dropdown::autosize_special(const Part &part, Geometry &ageom) const
  41 {
  42         if(part.get_name()=="list")
  43         {
  44                 Geometry lgeom;
  45                 list.autosize(lgeom);
  46                 ageom.w = max(ageom.w, list.get_geometry().w);
  47         }
  48         else if(part.get_name()=="text")
  49         {
  50                 const Sides &margin = part.get_margin();
  51                 const GL::Font &font = style->get_font();
  52                 float font_size = style->get_font_size();
  53
  54                 unsigned max_w = 0;
  55                 const ListData &data = list.get_data();
  56                 for(unsigned i=0; i<data.size(); ++i)
  57                 {
  58                         unsigned w = static_cast<unsigned>(font.get_string_width(data.get_string(i))*font_size);
  59                         max_w = max(max_w, w);
  60                 }
  61                 ageom.w = max(ageom.w, max_w+margin.left+margin.right);
  62
  63                 unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font_size);
  64                 ageom.h = max(ageom.h, line_height+margin.top+margin.bottom);
  65         }
  66 }
  67
  68 void Dropdown::rebuild_special(const Part &part)
  69 {
  70         if(part.get_name()=="text")
  71                 text.build(part, state, geom, part_cache);
  72         else
  73                 Widget::rebuild_special(part);
  74 }
  75
  76 void Dropdown::render_special(const Part &part, GL::Renderer &renderer) const
  77 {
  78         if(part.get_name()=="list" && dropped)
  79                 list.render(renderer);
  80 }
  81
  82 void Dropdown::button_press(int x, int y, unsigned btn)
  83 {
  84         if(dropped)
  85         {
  86                 Container::button_press(x, y, btn);
  87                 if(!click_focus)
  88                         close_list();
  89         }
  90         else if(btn==1)
  91                 open_list();
  92 }
  93
  94 bool Dropdown::navigate(Navigation nav)
  95 {
  96         if(dropped)
  97         {
  98                 if(nav==NAV_CANCEL)
  99                         close_list();
 100                 else
 101                         list.navigate(nav);
 102         }
 103         else if(nav==NAV_ACTIVATE)
 104                 open_list();
 105         else
 106                 return false;
 107
 108         return true;
 109 }
 110
 111 void Dropdown::on_geometry_change()
 112 {
 113         if(dropped)
 114                 resize_list();
 115 }
 116
 117 void Dropdown::on_style_change()
 118 {
 119         text.set_style(style);
 120         if(dropped)
 121                 resize_list();
 122 }
 123
 124 void Dropdown::open_list()
 125 {
 126         dropped = true;
 127         list.set_visible(true);
 128         resize_list();
 129         set_state(ACTIVE);
 130         set_input_focus(&list);
 131         signal_grab_pointer.emit();
 132 }
 133
 134 void Dropdown::close_list()
 135 {
 136         dropped = false;
 137         list.set_visible(false);
 138         clear_state(ACTIVE);
 139         signal_ungrab_pointer.emit();
 140 }
 141
 142 void Dropdown::list_autosize_changed()
 143 {
 144         if(dropped)
 145                 resize_list();
 146         signal_autosize_changed.emit();
 147 }
 148
 149 void Dropdown::resize_list()
 150 {
 151         Geometry lgeom;
 152         list.autosize(lgeom);
 153         lgeom.x = 0;
 154         lgeom.y = -lgeom.h;
 155         lgeom.w = max(geom.w, lgeom.w);
 156         int root_x = geom.x;
 157         int root_y = geom.y;
 158         for(Widget *p=parent; p; p=p->get_parent())
 159         {
 160                 root_x += p->get_geometry().x;
 161                 root_y += p->get_geometry().y;
 162                 if(Root *root = dynamic_cast<Root *>(p))
 163                 {
 164                         const Geometry &rgeom = root->get_geometry();
 165                         if(lgeom.h*2>rgeom.h)
 166                         {
 167                                 lgeom.h = rgeom.h/2;
 168                                 lgeom.y = -lgeom.h;
 169                         }
 170                         if(root_y+lgeom.y<0)
 171                                 lgeom.y = -root_y;
 172                         if(root_y+lgeom.y+lgeom.h>rgeom.h)
 173                                 lgeom.y = rgeom.h-lgeom.h-root_y;
 174                         if(root_x+lgeom.x+lgeom.w>rgeom.w)
 175                                 lgeom.x = rgeom.w-lgeom.w-root_x;
 176                         break;
 177                 }
 178         }
 179         list.set_geometry(lgeom);
 180 }
 181
 182 void Dropdown::list_item_selected(unsigned index)
 183 {
 184         if(dropped)
 185         {
 186                 dropped = false;
 187                 clear_state(ACTIVE);
 188                 signal_ungrab_pointer.emit();
 189         }
 190
 191         text.set(list.get_data().get_string(index));
 192
 193         signal_item_selected.emit(index);
 194         rebuild();
 195 }
 196
 197 void Dropdown::list_selection_cleared()
 198 {
 199         text.set(string());
 200 }
 201
 202
 203 Dropdown::Loader::Loader(Dropdown &d):
 204         DataFile::DerivedObjectLoader<Dropdown, Widget::Loader>(d)
 205 {
 206         add("item", &Loader::item);
 207 }
 208
 209 void Dropdown::Loader::item(const string &v)
 210 {
 211         dynamic_cast<BasicListData<string> &>(obj.list.get_data()).append(v);
 212 }
 213
 214 } // namespace GLtk
 215 } // namespace Msp