/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A base class for components that display a list of the files in a directory.

    @see DirectoryContentsList
*/
class JUCE_API  DirectoryContentsDisplayComponent
{
public:
    //==============================================================================
    /** Creates a DirectoryContentsDisplayComponent for a given list of files. */
    DirectoryContentsDisplayComponent (DirectoryContentsList& listToShow);

    /** Destructor. */
    virtual ~DirectoryContentsDisplayComponent();

    //==============================================================================
    /** The list that this component is displaying */
    DirectoryContentsList& directoryContentsList;

    //==============================================================================
    /** Returns the number of files the user has got selected.
        @see getSelectedFile
    */
    virtual int getNumSelectedFiles() const = 0;

    /** Returns one of the files that the user has currently selected.
        The index should be in the range 0 to (getNumSelectedFiles() - 1).
        @see getNumSelectedFiles
    */
    virtual File getSelectedFile (int index) const = 0;

    /** Deselects any selected files. */
    virtual void deselectAllFiles() = 0;

    /** Scrolls this view to the top. */
    virtual void scrollToTop() = 0;

    /** If the specified file is in the list, it will become the only selected item
        (and if the file isn't in the list, all other items will be deselected). */
    virtual void setSelectedFile (const File&) = 0;

    //==============================================================================
    /** Adds a listener to be told when files are selected or clicked.
        @see removeListener
    */
    void addListener (FileBrowserListener* listener);

    /** Removes a listener.
        @see addListener
    */
    void removeListener (FileBrowserListener* listener);


    //==============================================================================
    /** A set of colour IDs to use to change the colour of various aspects of the list.

        These constants can be used either via the Component::setColour(), or LookAndFeel::setColour()
        methods.

        @see Component::setColour, Component::findColour, LookAndFeel::setColour, LookAndFeel::findColour
    */
    enum ColourIds
    {
        highlightColourId      = 0x1000540, /**< The colour to use to fill a highlighted row of the list. */
        textColourId           = 0x1000541, /**< The colour for the text. */
    };

    //==============================================================================
    /** @internal */
    void sendSelectionChangeMessage();
    /** @internal */
    void sendDoubleClickMessage (const File&);
    /** @internal */
    void sendMouseClickMessage (const File&, const MouseEvent&);

protected:
    //==============================================================================
    ListenerList<FileBrowserListener> listeners;

private:
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (DirectoryContentsDisplayComponent)
};

} // namespace juce
