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