Paul Davis
792fe016e7
This stops tracks from appearing to scroll up under the rulers, among other things.
108 lines
2.4 KiB
C++
108 lines
2.4 KiB
C++
/*
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Copyright (C) 2014 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <iostream>
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#include "pbd/compose.h"
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#include "canvas/canvas.h"
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#include "canvas/debug.h"
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#include "canvas/scroll_group.h"
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using namespace std;
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using namespace ArdourCanvas;
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ScrollGroup::ScrollGroup (Group* parent, ScrollSensitivity s)
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: Group (parent)
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, _scroll_sensitivity (s)
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{
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}
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ScrollGroup::ScrollGroup (Group* parent, Duple position, ScrollSensitivity s)
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: Group (parent, position)
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, _scroll_sensitivity (s)
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{
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}
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void
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ScrollGroup::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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/* clip the draw to the area that this scroll group nominally occupies
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* WITHOUT scroll offsets in effect
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*/
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boost::optional<Rect> r = bounding_box();
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if (!r) {
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return;
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}
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Rect self (_position.x, _position.y, _position.x + r.get().width(), _position.y + r.get().height());
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self.x1 = min (_position.x + _canvas->width(), self.x1);
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self.y1 = min (_position.y + _canvas->height(), self.y1);
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context->save ();
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context->rectangle (self.x0, self.y0, self.width(), self.height());
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context->clip ();
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Group::render (area, context);
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context->restore ();
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}
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void
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ScrollGroup::scroll_to (Duple const& d)
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{
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if (_scroll_sensitivity & ScrollsHorizontally) {
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_scroll_offset.x = d.x;
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}
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if (_scroll_sensitivity & ScrollsVertically) {
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_scroll_offset.y = d.y;
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}
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}
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bool
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ScrollGroup::covers_canvas (Duple const& d) const
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{
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boost::optional<Rect> r = bounding_box ();
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if (!r) {
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return false;
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}
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return r->contains (d);
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}
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bool
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ScrollGroup::covers_window (Duple const& d) const
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{
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boost::optional<Rect> r = bounding_box ();
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if (!r) {
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return false;
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}
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Rect w = r->translate (-_scroll_offset);
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return w.contains (d);
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}
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