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Editor zooming: refactor zoom-limiting code into editor::session_gui_extents.

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This commit is contained in:
Ben Loftis 2017-08-26 21:05:40 -05:00
parent 9b87279eca
commit 901432f030
1 changed files with 6 additions and 43 deletions
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49
gtk2_ardour/editor_ops.cc
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@ -1789,49 +1789,12 @@ Editor::temporal_zoom_step_scale (bool zoom_out, double scale)
}
}
// ToDo: encapsulate all of this into something like editor::get_session_extents() or editor::leftmost(), rightmost()
{
//ToDo: also incorporate automation regions (in case the session has no audio/midi but is just used for automating plugins or the like)
//calculate the extents of all regions in every playlist
framecnt_t session_extent_start = 0;
framecnt_t session_extent_end = 0;
{
boost::shared_ptr<RouteList> rl = _session->get_routes();
for (RouteList::iterator r = rl->begin(); r != rl->end(); ++r) {
boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*r);
if (tr) {
boost::shared_ptr<Playlist> pl = tr->playlist();
if (pl) {
pair<framepos_t, framepos_t> e;
e = pl->get_extent();
if (e.first < session_extent_start) {
session_extent_start = e.first;
}
if (e.second > session_extent_end) {
session_extent_end = e.second;
}
}
}
}
}
framecnt_t session_extents = session_extent_end - session_extent_start;
//in a session with no regions, use the start/end markers to set max zoom
framecnt_t const session_length = _session->current_end_frame() - _session->current_start_frame ();
if ( session_length > session_extents )
session_extents = session_length;
//in a session with no regions or start/end markers, use 2 minutes to set max zoom
framecnt_t const min_length = _session->nominal_frame_rate()*60*2;
if ( min_length > session_extents )
session_extents = min_length;
//convert to samples-per-pixel and limit our zoom to this value
framecnt_t session_extents_pp = session_extents / _visible_canvas_width;
if (nspp > session_extents_pp)
nspp = session_extents_pp;
}
//zoom-behavior-tweaks
//limit our maximum zoom to the session gui extents value (+10%)
std::pair<framepos_t, framepos_t> ext = session_gui_extents();
framecnt_t session_extents_pp = ( ext.second - ext.first ) / _visible_canvas_width;
if (nspp > session_extents_pp * 1.1)
nspp = session_extents_pp * 1.1;
temporal_zoom (nspp);
}