JUCE/extras/Projucer/Source/Utility/UI/PropertyComponents/jucer_FilePathPropertyComponent.h

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

   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.

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

#pragma once


//==============================================================================
/** A PropertyComponent for selecting files or folders.

    The user may drag files over the property box, enter the path manually and/or click
    the '...' button to open a file selection dialog box.
*/
class FilePathPropertyComponent    : public PropertyComponent,
                                     public FileDragAndDropTarget,
                                     private Value::Listener
{
public:
    FilePathPropertyComponent (Value valueToControl, const String& propertyName, bool isDir, bool thisOS = true,
                               const String& wildcardsToUse = "*", const File& relativeRoot = File())
        : PropertyComponent (propertyName),
          text (valueToControl, propertyName, 1024, false),
          isDirectory (isDir), isThisOS (thisOS), wildcards (wildcardsToUse), root (relativeRoot)
    {
        textValue.referTo (valueToControl);
        init();
    }

    /** Displays a default value when no value is specified by the user. */
    FilePathPropertyComponent (ValueWithDefault& valueToControl, const String& propertyName, bool isDir, bool thisOS = true,
                               const String& wildcardsToUse = "*", const File& relativeRoot = File())
       : PropertyComponent (propertyName),
         text (valueToControl, propertyName, 1024, false),
         isDirectory (isDir), isThisOS (thisOS), wildcards (wildcardsToUse), root (relativeRoot)
    {
        textValue = valueToControl.getPropertyAsValue();
        init();
    }

    //==============================================================================
    void refresh() override {}

    void resized() override
    {
        auto bounds = getLocalBounds();

        text.setBounds (bounds.removeFromLeft (jmax (400, bounds.getWidth() - 55)));
        bounds.removeFromLeft (5);
        browseButton.setBounds (bounds);
    }

    void paintOverChildren (Graphics& g) override
    {
        if (highlightForDragAndDrop)
        {
            g.setColour (findColour (defaultHighlightColourId).withAlpha (0.5f));
            g.fillRect (getLookAndFeel().getPropertyComponentContentPosition (text));
        }
    }

    //==============================================================================
    bool isInterestedInFileDrag (const StringArray&) override     { return true; }
    void fileDragEnter (const StringArray&, int, int) override    { highlightForDragAndDrop = true;  repaint(); }
    void fileDragExit (const StringArray&) override               { highlightForDragAndDrop = false; repaint(); }

    void filesDropped (const StringArray& selectedFiles, int, int) override
    {
        setTo (selectedFiles[0]);

        highlightForDragAndDrop = false;
        repaint();
    }

private:
    //==============================================================================
    void init()
    {
        textValue.addListener (this);

        text.setInterestedInFileDrag (false);
        addAndMakeVisible (text);

        browseButton.onClick = [this] { browse(); };
        addAndMakeVisible (browseButton);

        lookAndFeelChanged();
    }

    void setTo (File f)
    {
        if (isDirectory && ! f.isDirectory())
            f = f.getParentDirectory();

        auto pathName = (root == File()) ? f.getFullPathName()
                                         : f.getRelativePathFrom (root);

        text.setText (pathName);
        updateEditorColour();
    }

    void browse()
    {
        File currentFile = {};

        if (text.getText().isNotEmpty())
            currentFile = root.getChildFile (text.getText());

        if (isDirectory)
        {
            FileChooser chooser ("Select directory", currentFile);

            if (chooser.browseForDirectory())
                setTo (chooser.getResult());
        }
        else
        {
            FileChooser chooser ("Select file", currentFile, wildcards);

            if (chooser.browseForFileToOpen())
                setTo (chooser.getResult());
        }
    }

    void updateEditorColour()
    {
        if (isThisOS)
        {
            text.setColour (TextPropertyComponent::textColourId, findColour (widgetTextColourId));

            auto pathToCheck = text.getText();

            if (pathToCheck.isNotEmpty())
            {
                pathToCheck.replace ("${user.home}", "~");

               #if JUCE_WINDOWS
                if (pathToCheck.startsWith ("~"))
                    pathToCheck = pathToCheck.replace ("~", File::getSpecialLocation (File::userHomeDirectory).getFullPathName());
               #endif

                if (! root.getChildFile (pathToCheck).exists())
                    text.setColour (TextPropertyComponent::textColourId, Colours::red);
            }
        }
    }

    void valueChanged (Value&) override
    {
        updateEditorColour();
    }

    void lookAndFeelChanged() override
    {
        browseButton.setColour (TextButton::buttonColourId, findColour (secondaryButtonBackgroundColourId));
        browseButton.setColour (TextButton::textColourOffId, Colours::white);

        updateEditorColour();
    }

    //==============================================================================
    Value textValue;

    TextPropertyComponent text;
    TextButton browseButton { "..." };

    bool isDirectory, isThisOS, highlightForDragAndDrop = false;
    String wildcards;
    File root;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FilePathPropertyComponent)
};