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