source/hslider.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/matrix.h>
   9 #include <msp/gl/transform.h>
  10 #include "graphic.h"
  11 #include "hslider.h"
  12 #include "part.h"
  13 #include "style.h"
  14
  15 namespace Msp {
  16 namespace GLtk {
  17
  18 HSlider::HSlider(const Resources &r):
  19         Slider(r),
  20         dragging(false)
  21 {
  22         update_style();
  23 }
  24
  25 void HSlider::button_press(int x, int y, unsigned btn)
  26 {
  27         if(geom.is_inside(x, y))
  28         {
  29                 int sw=get_slider_width();
  30                 int sx=geom.x+static_cast<int>((geom.w-sw)*(value-min)/(max-min));
  31                 if(btn==1 && x>=sx && x<sx+sw)
  32                 {
  33                         dragging=true;
  34                         state=ACTIVE;
  35                         drag_start_x=x;
  36                         drag_start_value=value;
  37                 }
  38         }
  39 }
  40
  41 void HSlider::button_release(int, int, unsigned btn)
  42 {
  43         if(btn==1)
  44         {
  45                 dragging=false;
  46                 state=NORMAL;
  47         }
  48 }
  49
  50 void HSlider::pointer_motion(int x, int)
  51 {
  52         if(dragging)
  53         {
  54                 set_value(drag_start_value+(x-drag_start_x)*(max-min)/(geom.w-get_slider_width()));
  55         }
  56 }
  57
  58 void HSlider::render_part(const Part &part) const
  59 {
  60         if(part.get_name()=="slider")
  61         {
  62                 unsigned gw=part.get_width();
  63                 unsigned gh=(part.get_fill_y() ? geom.h : part.get_height());
  64                 GL::push_matrix();
  65                 GL::translate((geom.w-gw)*(value-min)/(max-min), (geom.h-gh)*(part.get_alignment().y+1)/2, 0);
  66                 const Graphic *graphic=part.get_graphic(state);
  67                 graphic->render(gw, gh);
  68                 GL::pop_matrix();
  69         }
  70         else
  71                 Widget::render_part(part);
  72 }
  73
  74 unsigned HSlider::get_slider_width() const
  75 {
  76         for(PartSeq::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
  77                 if(i->get_name()=="slider")
  78                         return i->get_width();
  79
  80         return 0;
  81 }
  82
  83 } // namespace GLtk
  84 } // namespace Msp