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