juce_MultiTouchMapper.h

Go to the documentation of this file.

/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.
 
   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3
 
   Details of these licenses can be found at: www.gnu.org/licenses
 
   JUCE 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.
 
   ------------------------------------------------------------------------------
 
   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.
 
  ==============================================================================
*/
 
#ifndef JUCE_MULTITOUCHMAPPER_H_INCLUDED
#define JUCE_MULTITOUCHMAPPER_H_INCLUDED
 
template <typename IDType>
class MultiTouchMapper
{
public:
    MultiTouchMapper() {}
 
    int getIndexOfTouch (IDType touchID)
    {
        jassert (touchID != 0); // need to rethink this if IDs can be 0!
 
        int touchIndex = currentTouches.indexOf (touchID);
 
        if (touchIndex < 0)
        {
            for (touchIndex = 0; touchIndex < currentTouches.size(); ++touchIndex)
                if (currentTouches.getUnchecked (touchIndex) == 0)
                    break;
 
            currentTouches.set (touchIndex, touchID);
        }
 
        return touchIndex;
    }
 
    void clear()
    {
        currentTouches.clear();
    }
 
    void clearTouch (int index)
    {
        currentTouches.set (index, 0);
    }
 
    bool areAnyTouchesActive() const noexcept
    {
        for (int i = currentTouches.size(); --i >= 0;)
            if (currentTouches.getUnchecked(i) != 0)
                return true;
 
        return false;
    }
 
private:
    Array<IDType> currentTouches;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MultiTouchMapper)
};
 
#endif   // JUCE_MULTITOUCHMAPPER_H_INCLUDED