src/platform/wxwidgets/scrollbar.cpp

   1 #include "platform/wxwidgets/scrollbar.hpp"
   2 #include "platform/wxwidgets/platform.hpp"
   3 #include "library/minmax.hpp"
   4 #include <iostream>
   5
   6 scroll_bar::scroll_bar(wxWindow* parent, wxWindowID id, bool vertical)
   7         : wxScrollBar(parent, id, wxDefaultPosition, wxDefaultSize, vertical ? wxSB_VERTICAL : wxSB_HORIZONTAL)
   8 {
   9         CHECK_UI_THREAD;
  10         Connect(wxEVT_SCROLL_THUMBTRACK, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  11         Connect(wxEVT_SCROLL_PAGEDOWN, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  12         Connect(wxEVT_SCROLL_PAGEUP, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  13         Connect(wxEVT_SCROLL_LINEDOWN, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  14         Connect(wxEVT_SCROLL_LINEUP, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  15         Connect(wxEVT_SCROLL_TOP, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  16         Connect(wxEVT_SCROLL_BOTTOM, wxScrollEventHandler(scroll_bar::on_scroll), NULL, this);
  17         position = 0;
  18         range = 0;
  19         pagesize = 1;
  20         scroll_acc = 0;
  21 }
  22
  23 scroll_bar::~scroll_bar()
  24 {
  25 }
  26
  27 void scroll_bar::set_page_size(unsigned _pagesize)
  28 {
  29         CHECK_UI_THREAD;
  30         if(!_pagesize) _pagesize = 1;
  31         pagesize = _pagesize;
  32         if(range > pagesize)
  33                 SetScrollbar(position, pagesize, range, max(pagesize - 1, 1U));
  34         else
  35                 SetScrollbar(0, 0, 0, 0);
  36 }
  37
  38 void scroll_bar::set_range(unsigned _range)
  39 {
  40         CHECK_UI_THREAD;
  41         if(pagesize >= _range)
  42                 position = 0;
  43         else if(position + pagesize > _range)
  44                 position = _range - pagesize;
  45         range = _range;
  46         if(range > pagesize)
  47                 SetScrollbar(position, pagesize, range, max(pagesize - 1, 1U));
  48         else
  49                 SetScrollbar(0, 0, 0, 0);
  50 }
  51
  52 void scroll_bar::set_position(unsigned _position)
  53 {
  54         CHECK_UI_THREAD;
  55         if(pagesize >= range)
  56                 _position = 0;
  57         else if(_position + pagesize > range)
  58                 _position = range - pagesize;
  59         position = _position;
  60         if(range > pagesize)
  61                 SetScrollbar(position, pagesize, range, max(pagesize - 1, 1U));
  62         else
  63                 SetScrollbar(0, 0, 0, 0);
  64 }
  65
  66 void scroll_bar::apply_delta(int delta)
  67 {
  68         CHECK_UI_THREAD;
  69         unsigned maxscroll = range - pagesize;
  70         if(maxscroll > range)
  71                 maxscroll = 0;
  72         unsigned newscroll = position + delta;
  73         if(newscroll > range)
  74                 newscroll = (delta < 0) ? 0 : maxscroll;
  75         position = newscroll;
  76         if(position > maxscroll)
  77                 position = maxscroll;
  78         if(range > pagesize)
  79                 SetScrollbar(position, pagesize, range, max(pagesize - 1, 1U));
  80         else
  81                 SetScrollbar(0, 0, 0, 0);
  82         callback(*this);
  83 }
  84
  85 void scroll_bar::apply_wheel(int wheel, int wheelunit, unsigned speed)
  86 {
  87         if(!wheel || !wheelunit)
  88                 return;
  89         scroll_acc += wheel;
  90         while(wheelunit && scroll_acc <= -wheelunit) {
  91                 apply_delta(static_cast<int>(speed));
  92                 scroll_acc += wheelunit;
  93         }
  94         while(wheelunit && scroll_acc >= wheelunit) {
  95                 apply_delta(-static_cast<int>(speed));
  96                 scroll_acc -= wheelunit;
  97         }
  98 }
  99
 100 unsigned scroll_bar::get_position()
 101 {
 102         return position;
 103 }
 104
 105 void scroll_bar::set_handler(std::function<void(scroll_bar&)> cb)
 106 {
 107         callback = cb;
 108 }
 109
 110 void scroll_bar::on_scroll(wxScrollEvent& e)
 111 {
 112         CHECK_UI_THREAD;
 113         if(range)
 114                 position = GetThumbPosition();
 115         if(pagesize >= range)
 116                 position = 0;
 117         else if(position + pagesize > range)
 118                 position = range - pagesize;
 119         callback(*this);
 120 }