JUCE/examples/DemoRunner/Source/Demos/IntroScreen.h

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

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

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

   For the technical preview this file cannot be licensed commercially.

   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 IntroScreen   : public Component
{
public:
    IntroScreen()
    {
        setOpaque (true);

        addAndMakeVisible (versionLabel);
        addAndMakeVisible (linkButton);
        addAndMakeVisible (logo);

        versionLabel.setText (String ("{version}  built on {date}")
                                  .replace ("{version}", SystemStats::getJUCEVersion())
                                  .replace ("{date}",    String (__DATE__).replace ("  ", " ")),
                              dontSendNotification);

        linkButton.setColour (HyperlinkButton::textColourId, Colours::lightblue);

        setTitle ("Home");
        setFocusContainerType (FocusContainerType::focusContainer);
    }

    void paint (Graphics& g) override
    {
        g.fillAll (getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::windowBackground));
    }

    void resized() override
    {
        auto area = getLocalBounds().reduced (10);

        auto bottomSlice = area.removeFromBottom (24);
        linkButton.setBounds (bottomSlice.removeFromRight (getWidth() / 4));
        versionLabel.setBounds (bottomSlice);

        logo.setBounds (area);
    }

private:
    Label versionLabel;
    HyperlinkButton linkButton { "www.juce.com", { "http://www.juce.com" } };

    //==============================================================================
    struct LogoDrawComponent  : public Component,
                                private Timer
    {
        LogoDrawComponent()
        {
            setTitle ("JUCE Logo");
            startTimerHz (30); // repaint at 30 fps
        }

        void paint (Graphics& g) override
        {
            Path wavePath;

            auto waveStep = 10.0f;
            auto waveY = (float) getHeight() * 0.5f;
            int i = 0;

            for (auto x = waveStep * 0.5f; x < (float) getWidth(); x += waveStep)
            {
                auto y1 = waveY + (float) getHeight() * 0.05f * std::sin ((float) i * 0.38f + elapsed);
                auto y2 = waveY + (float) getHeight() * 0.10f * std::sin ((float) i * 0.20f + elapsed * 2.0f);

                wavePath.addLineSegment ({ x, y1, x, y2 }, 2.0f);
                wavePath.addEllipse (x - waveStep * 0.3f, y1 - waveStep * 0.3f, waveStep * 0.6f, waveStep * 0.6f);
                wavePath.addEllipse (x - waveStep * 0.3f, y2 - waveStep * 0.3f, waveStep * 0.6f, waveStep * 0.6f);

                ++i;
            }

            g.setColour (Colour::greyLevel (0.4f));
            g.fillPath (wavePath);

            g.setColour (Colour (0xc4f39082));
            g.fillPath (logoPath, RectanglePlacement (RectanglePlacement::centred)
                                    .getTransformToFit (logoPath.getBounds(),
                                                        getLocalBounds().reduced (20, getHeight() / 4).toFloat()));
        }

        void timerCallback() override
        {
            repaint();
            elapsed += 0.02f;
        }

        std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
        {
            return std::make_unique<AccessibilityHandler> (*this, AccessibilityRole::image);
        }

        Path logoPath  { getJUCELogoPath() };
        float elapsed = 0.0f;
    };

    LogoDrawComponent logo;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (IntroScreen)
};