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editor_hscroller.cc

/*
    Copyright (C) 2002 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: editor_hscroller.cc,v 1.17 2004/04/22 20:43:40 pauld Exp $
*/

#include "editor.h"

#include <ardour/session.h>

using namespace std;
using namespace ARDOUR;

void
Editor::hscroll_slider_allocate (GtkAllocation *alloc)
{
      //edit_hscroll_slider_width = alloc->width;
      //edit_hscroll_slider_height = alloc->height ;

      if (session) {
            track_canvas_scroller.get_hadjustment()->set_upper (session->current_end_frame() / frames_per_unit);
      }

}

gint
Editor::hscroll_slider_expose (GdkEventExpose *ev)
{
      GdkRectangle draw_rect;
      GdkRectangle bar_rect;
      gint bar_max = edit_hscroll_slider_width - 2;

      bar_rect.y = 1;
      bar_rect.height = edit_hscroll_slider_height - 2;

      if (session) {
            bar_rect.width = (gint) floor (bar_max * ((canvas_width * frames_per_unit) / session->current_end_frame()));

            if (bar_rect.width > bar_max) {
                  bar_rect.x = 1;
                  bar_rect.width = bar_max;
            } else {
                  bar_rect.x = 1 + (gint) floor (bar_max * ((double) leftmost_frame / session->current_end_frame()));
            }
            
      } else {
            bar_rect.x = 1;
            bar_rect.width = bar_max;
      }

      /* make sure we can see the bar at all times, and have enough to do zoom-trim on */

      bar_rect.width = max ((guint16) (edit_hscroll_edge_width+5), bar_rect.width);

      gdk_rectangle_intersect (&ev->area, &bar_rect, &draw_rect);

      gtk_paint_box (edit_hscroll_slider.get_style()->gtkobj(),
                   edit_hscroll_slider.get_window(),
                   GTK_STATE_ACTIVE, 
                   GTK_SHADOW_IN, 
                   &ev->area, 
                   GTK_WIDGET(edit_hscroll_slider.gtkobj()),
                   "trough",
                   0, 0, -1, -1);

      gtk_paint_box (edit_hscroll_slider.get_style()->gtkobj(),
                   edit_hscroll_slider.get_window(),
                   GTK_STATE_NORMAL, 
                   GTK_SHADOW_OUT, 
                   &draw_rect,
                   GTK_WIDGET(edit_hscroll_slider.gtkobj()),
                   "hscale",
                   bar_rect.x, bar_rect.y, bar_rect.width, bar_rect.height);


      return TRUE;
}

gint
Editor::hscroll_slider_button_press (GdkEventButton *ev)
{
      if (!session) {
            return TRUE;
      }

      edit_hscroll_dragging = true;
      //cerr << "PRESS" << endl;

      return TRUE;
      
      gint start;
      gint width;
      gint end;
      gint x;

      start = (gint) floor (edit_hscroll_slider_width * ((double) leftmost_frame / session->current_end_frame()));
      width = (gint) floor (edit_hscroll_slider_width * ((canvas_width * frames_per_unit) / session->current_end_frame()));

      end = start + width - 1;
      x = (gint) max (0.0, ev->x);
      
      if (x >= start && x <= end) {
            
            edit_hscroll_drag_last = x;
            edit_hscroll_dragging = true;
            Gtk::Main::grab_add (edit_hscroll_slider);
      }

      return TRUE;
}

gint
Editor::hscroll_slider_button_release (GdkEventButton *ev)
{
      if (!session) {
            return TRUE;
      }

      gint start;
      gint width;
      gint end;
      gint x;
      gint bar_max = edit_hscroll_slider_width - 2;
      jack_nframes_t new_leftmost = 0;

      //cerr << "RELESAE" << endl;

      if (edit_hscroll_dragging) {
            // lets do a tempo redisplay now only, because it is dog slow
            tempo_map_changed (Change (0));
            edit_hscroll_dragging = false;
      }
      
      return TRUE;

      
      start = (gint) floor (bar_max * ((double) leftmost_frame / session->current_end_frame()));
      width = (gint) floor (bar_max * ((canvas_width * frames_per_unit) / session->current_end_frame()));

      end = start + width - 1;
      x = (gint) max (0.0, ev->x);

      if (!edit_hscroll_dragging) {

            new_leftmost = (jack_nframes_t) floor (((double) x/bar_max) * session->current_end_frame());
            reposition_x_origin (new_leftmost);
      }

      if (edit_hscroll_dragging) {
            // lets do a tempo redisplay now only, because it is dog slow
            tempo_map_changed (Change (0));
            edit_hscroll_dragging = false;
            Gtk::Main::grab_remove (edit_hscroll_slider);
      } 

      return TRUE;
}

gint
Editor::hscroll_slider_motion (GdkEventMotion *ev)
{
      gint x, y;
      GdkModifierType state;
      gint bar_max = edit_hscroll_slider_width - 2;

      if (!session || !edit_hscroll_dragging) {
            return TRUE;
      }

      edit_hscroll_slider.get_window().get_pointer (x, y, state);

      jack_nframes_t new_frame;
      jack_nframes_t frames;
      double distance;
      double fract;

      distance = x - edit_hscroll_drag_last;
      fract = fabs (distance) / bar_max;
      frames = (jack_nframes_t) floor (session->current_end_frame() * fract);

      if (distance < 0) {
            if (leftmost_frame < frames) {
                  new_frame = 0;
            } else {
                  new_frame = leftmost_frame - frames;
            }
      } else {
            if (leftmost_frame > max_frames - frames) {
                  new_frame = max_frames;
            } else {
                  new_frame = leftmost_frame + frames;
            }
      }

      if (new_frame != leftmost_frame) {
            reposition_x_origin (new_frame);
      }

      edit_hscroll_drag_last = x;
      
      return TRUE;
}

void
Editor::update_hscroller ()
{
      //edit_hscroll_slider.queue_draw ();
//    if (session) {
//          track_canvas_scroller.get_hadjustment()->set_upper (session->current_end_frame() / frames_per_unit);
//          track_canvas_scroller.get_hadjustment()->set_value (leftmost_frame/frames_per_unit);
//    }
}

gint
Editor::hscroll_left_arrow_button_press (GdkEventButton *ev)
{
      if (!session) {
            return FALSE;
      }

      start_canvas_autoscroll (-1);
      return TRUE;
}

gint
Editor::hscroll_right_arrow_button_press (GdkEventButton *ev)
{
      if (!session) {
            return FALSE;
      }

      start_canvas_autoscroll (1);
      return TRUE;
}

gint
Editor::hscroll_left_arrow_button_release (GdkEventButton *ev)
{
      if (!session) {
            return FALSE;
      }

      stop_canvas_autoscroll ();
      return TRUE;
}

gint
Editor::hscroll_right_arrow_button_release (GdkEventButton *ev)
{
      if (!session) {
            return FALSE;
      }

      stop_canvas_autoscroll ();
      return TRUE;
}

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