/usr/include/simgear/canvas/CanvasEventManager.hxx is in libsimgear-dev 1:2018.1.1+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | // Manage event handling inside a Canvas similar to the DOM Level 3 Event Model
//
// Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#ifndef CANVAS_EVENT_MANAGER_HXX_
#define CANVAS_EVENT_MANAGER_HXX_
#include "canvas_fwd.hxx"
#include <deque>
namespace simgear
{
namespace canvas
{
struct EventTarget
{
ElementWeakPtr element;
// Used as storage by EventManager during event propagation
mutable osg::Vec2f local_pos;
EventTarget( Element* el,
const osg::Vec2f pos = osg::Vec2f() ):
element(el),
local_pos(pos)
{}
};
inline bool operator==(const EventTarget& t1, const EventTarget& t2)
{
return t1.element.lock() == t2.element.lock();
}
class EventManager
{
public:
EventManager();
bool handleEvent( const MouseEventPtr& event,
const EventPropagationPath& path );
bool propagateEvent( const EventPtr& event,
const EventPropagationPath& path );
protected:
struct StampedPropagationPath
{
StampedPropagationPath();
StampedPropagationPath(const EventPropagationPath& path, double time);
void clear();
bool valid() const;
EventPropagationPath path;
double time;
};
// TODO if we really need the paths modify to not copy around the paths
// that much.
StampedPropagationPath _last_mouse_over;
size_t _current_click_count;
struct MouseEventInfo:
public StampedPropagationPath
{
int button;
osg::Vec2f pos;
void set( const MouseEventPtr& event,
const EventPropagationPath& path );
} _last_mouse_down,
_last_click;
/**
* Propagate click event and handle multi-click (eg. create dblclick)
*/
bool handleClick( const MouseEventPtr& event,
const EventPropagationPath& path );
/**
* Handle mouseover/enter/out/leave
*/
bool handleMove( const MouseEventPtr& event,
const EventPropagationPath& path );
/**
* Check if two click events (either mousedown/up or two consecutive
* clicks) are inside a maximum distance to still create a click or
* dblclick event respectively.
*/
bool checkClickDistance( const osg::Vec2f& pos1,
const osg::Vec2f& pos2 ) const;
EventPropagationPath
getCommonAncestor( const EventPropagationPath& path1,
const EventPropagationPath& path2 ) const;
};
} // namespace canvas
} // namespace simgear
#endif /* CANVAS_EVENT_MANAGER_HXX_ */
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