JUCE/extras/Projucer/Source/Utility/UI/jucer_IconButton.h

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

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

   For this technical preview, this file is not subject to commercial licensing.

   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


//==============================================================================
class IconButton  : public Button
{
public:
    IconButton (String buttonName, Image imageToDisplay)
        : Button (buttonName),
          iconImage (imageToDisplay)
    {
        setTooltip (buttonName);
    }

    IconButton (String buttonName, Path pathToDisplay)
        : Button (buttonName),
          iconPath (pathToDisplay),
          iconImage (createImageFromPath (iconPath))
    {
        setTooltip (buttonName);
    }

    void setImage (Image newImage)
    {
        iconImage = newImage;
        repaint();
    }

    void setPath (Path newPath)
    {
        iconImage = createImageFromPath (newPath);
        repaint();
    }

    void setBackgroundColour (Colour backgroundColourToUse)
    {
        backgroundColour = backgroundColourToUse;
        usingNonDefaultBackgroundColour = true;
    }

    void setIconInset (int newIconInset)
    {
        iconInset = newIconInset;
        repaint();
    }

    void paintButton (Graphics& g, bool isMouseOverButton, bool isButtonDown) override
    {
        float alpha = 1.0f;

        if (! isEnabled())
        {
            isMouseOverButton = false;
            isButtonDown = false;

            alpha = 0.2f;
        }

        auto fill = isButtonDown ? backgroundColour.darker (0.5f)
                                 : isMouseOverButton ? backgroundColour.darker (0.2f)
                                                     : backgroundColour;

        auto bounds = getLocalBounds();

        if (isButtonDown)
            bounds.reduce (2, 2);

        Path ellipse;
        ellipse.addEllipse (bounds.toFloat());
        g.reduceClipRegion (ellipse);

        g.setColour (fill.withAlpha (alpha));
        g.fillAll();

        g.setOpacity (alpha);
        g.drawImage (iconImage, bounds.reduced (iconInset).toFloat(), RectanglePlacement::fillDestination, false);
    }

private:
    void lookAndFeelChanged() override
    {
        if (! usingNonDefaultBackgroundColour)
            backgroundColour = findColour (defaultButtonBackgroundColourId);

        if (iconPath != Path())
            iconImage = createImageFromPath (iconPath);

        repaint();
    }

    Image createImageFromPath (Path path)
    {
        Image image (Image::ARGB, 250, 250, true);
        Graphics g (image);

        g.setColour (findColour (defaultIconColourId));

        g.fillPath (path, RectanglePlacement (RectanglePlacement::centred)
                            .getTransformToFit (path.getBounds(), image.getBounds().toFloat()));

        return image;
    }

    Path iconPath;
    Image iconImage;
    Colour backgroundColour { findColour (defaultButtonBackgroundColourId) };
    bool usingNonDefaultBackgroundColour = false;
    int iconInset = 2;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (IconButton)
};