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basic, prototypical drag handle implementation

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This commit is contained in:
Paul Davis 2014-01-02 16:48:44 -05:00
parent 10c8b48235
commit edb932b819
2 changed files with 93 additions and 0 deletions
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41
libs/canvas/canvas/drag_handle.h Normal file
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/*
Copyright (C) 2011-2014 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.
*/
#ifndef __canvas_drag_handle_h__
#define __canvas_drag_handle_h__
#include "canvas/rectangle.h"
#include "canvas/circle.h"
namespace ArdourCanvas
{
class LIBCANVAS_API DragHandle : public Rectangle
{
public:
DragHandle (Group *, Rect const &, bool left_side);
void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
protected:
bool _left_side;
};
}
#endif /* __canvas_drag_handle_h__ */

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libs/canvas/drag_handle.cc Normal file
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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 <cairomm/context.h>
#include "pbd/stacktrace.h"
#include "pbd/compose.h"
#include "canvas/drag_handle.h"
using namespace ArdourCanvas;
DragHandle::DragHandle (Group* g, Rect const & r, bool left_side)
: Item (g)
, Rectangle (g, r)
, _left_side (left_side)
{
}
void
DragHandle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
Rectangle::render (area, context);
Duple circle_center (_left_side ? x0() : x1(), (y1() - y0())/2.0);
Duple window_circle_center = item_to_window (circle_center);
context->set_source_rgba (1.0, 0.0, 0.0, 1.0);
if (_left_side) {
context->arc (window_circle_center.x, window_circle_center.y, 7.0, -M_PI/2.0, +M_PI/2.0);
} else {
context->arc_negative (window_circle_center.x, window_circle_center.y, 7.0, -M_PI/2.0, +M_PI/2.0);
}
context->fill ();
}