JUCE/examples/AUv3Synth/Source/MaterialLookAndFeel.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.

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

#include "../JuceLibraryCode/JuceHeader.h"

//==============================================================================
class MaterialLookAndFeel : public LookAndFeel_V4
{
public:
    //==============================================================================
    MaterialLookAndFeel()
    {
        setColour (ResizableWindow::backgroundColourId, windowBackgroundColour);
        setColour (TextButton::buttonOnColourId, brightButtonColour);
        setColour (TextButton::buttonColourId, disabledButtonColour);
    }

    //==============================================================================
    void drawButtonBackground (Graphics& g,
                               Button& button,
                               const Colour& /*backgroundColour*/,
                               bool /*isMouseOverButton*/,
                               bool isButtonDown) override
    {
        const auto buttonRect = button.getLocalBounds().toFloat();

        if (isButtonDown)
            g.setColour (brightButtonColour.withAlpha (0.7f));
        else if (! button.isEnabled())
            g.setColour (disabledButtonColour);
        else
            g.setColour (brightButtonColour);

        g.fillRoundedRectangle (buttonRect, 5.0f);
    }

    //==============================================================================
    void drawButtonText (Graphics& g, TextButton& button, bool isMouseOverButton, bool isButtonDown) override
    {
        ignoreUnused (isMouseOverButton, isButtonDown);

        Font font (getTextButtonFont (button, button.getHeight()));
        g.setFont (font);

        if (button.isEnabled())
            g.setColour (Colours::white);
        else
            g.setColour (backgroundColour);

        g.drawFittedText (button.getButtonText(), 0, 0,
                          button.getWidth(),
                          button.getHeight(),
                          Justification::centred, 2);
    }

    //==============================================================================
    void drawLinearSlider (Graphics& g, int x, int y, int width, int height,
                           float sliderPos, float minSliderPos, float maxSliderPos,
                           const Slider::SliderStyle style, Slider& slider) override
    {
        ignoreUnused (style, minSliderPos, maxSliderPos);

        Rectangle<int> r = Rectangle<int> (x + haloRadius, y, width - (haloRadius * 2), height);
        Rectangle<int> backgroundBar = r.withSizeKeepingCentre(r.getWidth(), 2);

        sliderPos = (sliderPos - minSliderPos) / static_cast<float> (width);

        int knobPos = static_cast<int> (sliderPos * r.getWidth());

        g.setColour (sliderActivePart);
        g.fillRect (backgroundBar.removeFromLeft (knobPos));

        g.setColour (sliderInactivePart);
        g.fillRect (backgroundBar);

        if (slider.isMouseOverOrDragging())
        {
            Rectangle<int> haloBounds = r.withTrimmedLeft (knobPos - haloRadius)
                                         .withWidth (haloRadius*2)
                                         .withSizeKeepingCentre(haloRadius*2, haloRadius*2);

            g.setColour (sliderActivePart.withAlpha (0.5f));
            g.fillEllipse (haloBounds.toFloat());
        }

        const int knobRadius = slider.isMouseOverOrDragging() ? knobActiveRadius : knobInActiveRadius;
        Rectangle<int> knobBounds = r.withTrimmedLeft (knobPos - knobRadius)
                                     .withWidth (knobRadius*2)
                                     .withSizeKeepingCentre(knobRadius*2, knobRadius*2);

        g.setColour (sliderActivePart);
        g.fillEllipse (knobBounds.toFloat());
    }

    //==============================================================================
    Font getTextButtonFont (TextButton& button, int buttonHeight) override
    {
        return LookAndFeel_V3::getTextButtonFont (button, buttonHeight).withHeight (buttonFontSize);
    }

    Font getLabelFont (Label& label) override
    {
        return LookAndFeel_V3::getLabelFont (label).withHeight (labelFontSize);
    }

    //==============================================================================
    const int labelFontSize = 12;
    const int buttonFontSize = 15;

    //==============================================================================
    const int knobActiveRadius = 12;
    const int knobInActiveRadius = 8;
    const int haloRadius = 18;

    //==============================================================================
    const Colour windowBackgroundColour = Colour (0xff262328);
    const Colour backgroundColour = Colour (0xff4d4d4d);
    const Colour brightButtonColour = Colour (0xff80cbc4);
    const Colour disabledButtonColour = Colour (0xffe4e4e4);
    const Colour sliderInactivePart = Colour (0xff545d62);
    const Colour sliderActivePart = Colour (0xff80cbc4);
};