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