libs/gtkmm2ext/gtkmm2ext/fastmeter.h

   1 /*
   2     Copyright (C) 2003 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #ifndef __gtkmm2ext_fastmeter_h__
  21 #define __gtkmm2ext_fastmeter_h__
  22
  23 #include <map>
  24 #include <cairomm/pattern.h>
  25
  26 #include <gtkmm/drawingarea.h>
  27 #include <gdkmm/pixbuf.h>
  28
  29 namespace Gtkmm2ext {
  30
  31 class FastMeter : public Gtk::DrawingArea {
  32   public:
  33         typedef std::map<int,Cairo::RefPtr<Cairo::Pattern> > PatternMap;
  34         enum Orientation {
  35                 Horizontal,
  36                 Vertical
  37         };
  38
  39         FastMeter (long hold_cnt, unsigned long width, Orientation, int len=0, int clrb0=0x00ff00, int clr1=0xffff00, int clr2=0xffaa00, int clr3=0xff0000);
  40         virtual ~FastMeter ();
  41
  42         void set (float level);
  43         void clear ();
  44
  45         float get_level() { return current_level; }
  46         float get_user_level() { return current_user_level; }
  47         float get_peak() { return current_peak; }
  48
  49         long hold_count() { return hold_cnt; }
  50         void set_hold_count (long);
  51
  52   protected:
  53         bool on_expose_event (GdkEventExpose*);
  54         void on_size_request (GtkRequisition*);
  55         void on_size_allocate (Gtk::Allocation&);
  56
  57   private:
  58
  59         Cairo::RefPtr<Cairo::Pattern> pattern;
  60         gint pixheight;
  61         gint pixwidth;
  62         static int _clr0, _clr1, _clr2, _clr3;
  63
  64         Orientation orientation;
  65         GdkRectangle pixrect;
  66         GdkRectangle last_peak_rect;
  67         gint request_width;
  68         gint request_height;
  69         unsigned long hold_cnt;
  70         unsigned long hold_state;
  71         float current_level;
  72         float current_peak;
  73         float current_user_level;
  74
  75         bool vertical_expose (GdkEventExpose*);
  76         bool horizontal_expose (GdkEventExpose*);
  77         void queue_vertical_redraw (const Glib::RefPtr<Gdk::Window>&, float);
  78         void queue_horizontal_redraw (const Glib::RefPtr<Gdk::Window>&, float);
  79
  80         static Cairo::RefPtr<Cairo::Pattern> generate_meter_pattern (int width, int height);
  81         static Cairo::RefPtr<Cairo::Pattern> request_vertical_meter (int w, int h);
  82         static Cairo::RefPtr<Cairo::Pattern> request_horizontal_meter (int w, int h);
  83
  84         static PatternMap v_pattern_cache;
  85         static PatternMap h_pattern_cache;
  86         static int min_pattern_metric_size; // min dimension for axis that displays the meter level
  87         static int max_pattern_metric_size; // max dimension for axis that displays the meter level
  88 };
  89
  90
  91 } /* namespace */
  92
  93  #endif /* __gtkmm2ext_fastmeter_h__ */