audio_file_drop_source.h

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#pragma once
 
#include "JuceHeader.h"
 
#include <climits>
 
class AudioFileDropSource : public FileDragAndDropTarget {
public:
    class Listener {
    public:
        virtual ~Listener() { }
 
        virtual void audioFileLoaded(const File& file) = 0;
    };
 
    AudioFileDropSource() {
        format_manager_.registerBasicFormats();
    }
 
    bool isInterestedInFileDrag(const StringArray& files) override {
        if (files.size() != 1)
            return false;
 
        String file = files[0];
        StringArray wildcards;
        wildcards.addTokens(getExtensions(), ";", "\"");
        for (const String& wildcard : wildcards) {
            if (file.matchesWildcard(wildcard, true))
                return true;
        }
        return false;
    }
 
    void filesDropped(const StringArray& files, int x, int y) override {
        if (files.size() == 0)
            return;
 
        File file(files[0]);
        audioFileLoaded(file);
        for (Listener* listener : listeners_)
            listener->audioFileLoaded(file);
    }
 
    virtual void audioFileLoaded(const File& file) = 0;
 
    void addListener(Listener* listener) { listeners_.push_back(listener); }
 
    String getExtensions() { return format_manager_.getWildcardForAllFormats(); }
 
    AudioFormatManager& formatManager() { return format_manager_; }
 
protected:
    AudioFormatManager format_manager_; 
 
private:
    std::vector<Listener*> listeners_; 
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(AudioFileDropSource)
};