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livetrax/libs/canvas/scroll_group.cc

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/*
Copyright (C) 2014 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.
*/
#include <iostream>
#include "pbd/compose.h"
#include "canvas/canvas.h"
#include "canvas/debug.h"
#include "canvas/scroll_group.h"
using namespace std;
using namespace ArdourCanvas;
ScrollGroup::ScrollGroup (Canvas* c, ScrollSensitivity s)
: Group (c)
, _scroll_sensitivity (s)
{
}
ScrollGroup::ScrollGroup (Group* g, ScrollSensitivity s)
: Group (g)
, _scroll_sensitivity (s)
{
}
void
ScrollGroup::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
/* clip the draw to the area that this scroll group nominally occupies
* WITHOUT scroll offsets in effect
*/
boost::optional<Rect> r = bounding_box();
if (!r) {
return;
}
Rect self (_position.x, _position.y, _position.x + r.get().width(), _position.y + r.get().height());
self.x1 = min (_position.x + _canvas->width(), self.x1);
self.y1 = min (_position.y + _canvas->height(), self.y1);
context->save ();
context->rectangle (self.x0, self.y0, self.width(), self.height());
context->clip ();
Group::render (area, context);
context->restore ();
}
void
ScrollGroup::scroll_to (Duple const& d)
{
if (_scroll_sensitivity & ScrollsHorizontally) {
_scroll_offset.x = d.x;
}
if (_scroll_sensitivity & ScrollsVertically) {
_scroll_offset.y = d.y;
}
}
bool
ScrollGroup::covers_canvas (Duple const& d) const
{
boost::optional<Rect> r = bounding_box ();
if (!r) {
return false;
}
return r->contains (d);
}
bool
ScrollGroup::covers_window (Duple const& d) const
{
boost::optional<Rect> r = bounding_box ();
if (!r) {
return false;
}
Rect w = r->translate (-_scroll_offset);
return w.contains (d);
}