13
0
livetrax/libs/canvas/scroll_group.cc
Robin Gareus 87d17f6624
Prevent rendering outside of canvas scroll groups
This fixes automation lanes bleeding into the ruler area.

The bounding box of all items in the main canvas group starts
at -0.5, and the cursor-scroll-group at -1.5. This is calculated
to include line-width, and outlines outside the item(s).

A scroll-group however must not extend its render area to
render those.
2022-07-06 20:50:03 +02:00

121 lines
2.8 KiB
C++

/*
* Copyright (C) 2014-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2015 David Robillard <d@drobilla.net>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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)
: Container (c)
, _scroll_sensitivity (s)
{
}
ScrollGroup::ScrollGroup (Item* parent, ScrollSensitivity s)
: Container (parent)
, _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
*/
Rect r = bounding_box();
if (!r) {
return;
}
r.x0 = max (r.x0, 0.);
r.y0 = max (r.y0, 0.);
Rect self (_position.x + r.x0,
_position.y + r.y0,
_position.x + r.x1,
_position.y + r.y1);
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 ();
Container::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
{
Rect r = bounding_box ();
if (!r) {
return false;
}
/* Bounding box is in item coordinates, but we need
to consider the position of the bounding box
within the canvas.
*/
return r.translate (position()).contains (d);
}
bool
ScrollGroup::covers_window (Duple const& d) const
{
Rect r = bounding_box ();
if (!r) {
return false;
}
/* Bounding box is in item coordinates, but we need
to consider the position of the bounding box
within the canvas.
*/
return r.translate (position()).contains (d);
}