101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
// Manage event handling inside a Canvas similar to the DOM Level 3 Event Model
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//
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// Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#ifndef CANVAS_EVENT_MANAGER_HXX_
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#define CANVAS_EVENT_MANAGER_HXX_
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#include "canvas_fwd.hxx"
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#include <deque>
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namespace simgear
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{
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namespace canvas
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{
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struct EventTarget
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{
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ElementWeakPtr element;
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osg::Vec2f local_pos,
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local_delta;
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};
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typedef std::deque<EventTarget> EventPropagationPath;
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inline bool operator==(const EventTarget& t1, const EventTarget& t2)
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{
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return t1.element.lock() == t2.element.lock();
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}
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class EventManager
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{
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public:
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EventManager();
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bool handleEvent( const MouseEventPtr& event,
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const EventPropagationPath& path );
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protected:
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struct StampedPropagationPath
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{
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StampedPropagationPath();
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StampedPropagationPath(const EventPropagationPath& path, double time);
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void clear();
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bool valid() const;
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EventPropagationPath path;
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double time;
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};
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// TODO if we really need the paths modify to not copy around the paths
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// that much.
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StampedPropagationPath _last_mouse_down,
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_last_click,
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_last_mouse_over;
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size_t _current_click_count;
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/**
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* Propagate click event and handle multi-click (eg. create dblclick)
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*/
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bool handleClick( const MouseEventPtr& event,
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const EventPropagationPath& path );
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/**
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* Handle mouseover/enter/out/leave
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*/
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bool handleMove( const MouseEventPtr& event,
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const EventPropagationPath& path );
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bool propagateEvent( const EventPtr& event,
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const EventPropagationPath& path );
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/**
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* Check if two click events (either mousedown/up or two consecutive
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* clicks) are inside a maximum distance to still create a click or
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* dblclick event respectively.
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*/
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bool checkClickDistance( const EventPropagationPath& path1,
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const EventPropagationPath& path2 ) const;
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EventPropagationPath
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getCommonAncestor( const EventPropagationPath& path1,
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const EventPropagationPath& path2 ) const;
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};
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} // namespace canvas
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} // namespace simgear
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#endif /* CANVAS_EVENT_MANAGER_HXX_ */
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