JUCE/examples/DemoRunner/Source/UI/MainComponent.cpp

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

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

   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 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-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 "MainComponent.h"

//==============================================================================
struct SidePanelHeader    : public Component
{
    SidePanelHeader (MainComponent& o)
        : owner (o)
    {
        setOpaque (true);

        static const unsigned char homeIconPathData[]
            = { 110,109,0,0,64,65,0,0,64,64,98,0,0,64,65,0,0,64,64,74,12,186,64,164,112,5,65,24,217,22,64,70,182,
                51,65,98,35,219,9,64,240,167,54,65,0,0,0,64,170,241,58,65,0,0,0,64,0,0,64,65,98,0,0,0,64,22,217,
                72,65,166,155,28,64,0,0,80,65,0,0,64,64,0,0,80,65,108,0,0,160,64,0,0,80,65,108,0,0,160,64,0,0,
                160,65,98,0,0,160,64,139,108,164,65,211,77,174,64,0,0,168,65,0,0,192,64,0,0,168,65,108,0,0,16,65,
                0,0,168,65,98,22,217,24,65,0,0,168,65,0,0,32,65,127,106,164,65,0,0,32,65,0,0,160,65,108,0,0,32,65,0,0,128,
                65,108,0,0,96,65,0,0,128,65,108,0,0,96,65,0,0,160,65,98,0,0,96,65,127,106,164,65,233,38,103,65,0,0,168,
                65,0,0,112,65,0,0,168,65,108,0,0,144,65,0,0,168,65,98,139,108,148,65,0,0,168,65,0,0,152,65,139,108,164,
                65,0,0,152,65,0,0,160,65,108,0,0,152,65,0,0,80,65,108,0,0,168,65,0,0,80,65,98,139,108,172,65,0,0,80,65,0,
                0,176,65,23,217,72,65,0,0,176,65,0,0,64,65,98,0,0,176,65,170,241,58,65,156,196,174,65,240,167,54,65,158,239,
                172,65,70,182,51,65,98,213,120,145,65,164,112,5,65,0,0,64,65,0,0,64,64,0,0,64,65,0,0,64,64,99,
                101,0,0 };

        static const unsigned char settingsIconPathData[]
            = { 110,109,202,111,210,64,243,226,61,64,108,0,0,224,64,0,0,0,0,108,0,0,48,65,0,0,0,0,108,27,200,54,65,243,
                226,61,64,98,91,248,63,65,174,170,76,64,95,130,72,65,231,138,96,64,46,46,80,65,180,163,120,64,108,42,
                181,124,65,20,38,49,64,108,149,90,142,65,246,108,199,64,108,68,249,118,65,2,85,1,65,98,112,166,119,65,
                201,31,6,65,0,0,120,65,111,5,11,65,0,0,120,65,0,0,16,65,98,0,0,120,65,145,250,20,65,108,166,119,65,55,
                224,25,65,72,249,118,65,254,170,30,65,108,151,90,142,65,133,73,60,65,108,46,181,124,65,123,182,115,65,
                108,50,46,80,65,18,215,97,65,98,99,130,72,65,70,221,103,65,96,248,63,65,83,213,108,65,32,200,54,65,66,
                135,112,65,108,0,0,48,65,0,0,144,65,108,0,0,224,64,0,0,144,65,108,202,111,210,64,67,135,112,65,98,74,
                15,192,64,84,213,108,65,65,251,174,64,70,221,103,65,164,163,159,64,19,215,97,65,108,92,43,13,64,123,182,
                115,65,108,187,181,82,62,133,73,60,65,108,244,26,36,64,254,170,30,65,98,64,102,33,64,55,224,25,5,0,0,32,
                64,145,250,20,65,0,0,32,64,0,0,16,65,98,0,0,32,64,111,5,11,65,64,102,33,64,201,31,6,65,244,26,36,64,2,85,
                1,65,108,187,181,82,62,246,108,199,64,108,92,43,13,64,20,38,49,64,108,164,163,159,64,180,163,120,64,98,65,
                251,174,64,231,138,96,64,74,15,192,64,175,170,76,64,202,111,210,64,243,226,61,64,99,109,0,0,16,65,0,0,64,
                65,98,121,130,42,65,0,0,64,65,0,0,64,65,121,130,42,65,0,0,64,65,0,0,16,65,98,0,0,64,65,13,251,234,64,121,
                130,42,65,0,0,192,64,0,0,16,65,0,0,192,64,98,13,251,234,64,0,0,192,64,0,0,192,64,13,251,234,64,0,0,192,64,
                0,0,16,65,98,0,0,192,64,121,130,42,65,13,251,234,64,0,0,64,65,0,0,16,65,0,0,64,65,99,101,0,0 };

        Path p;
        p.loadPathFromData (homeIconPathData, sizeof (homeIconPathData));
        homeButton.setShape (p, true, true, false);

        p.clear();
        p.loadPathFromData (settingsIconPathData, sizeof (settingsIconPathData));
        settingsButton.setShape (p, true, true, false);

        titleLabel.setText (owner.getSidePanel().getTitleText(), NotificationType::dontSendNotification);
        addAndMakeVisible (titleLabel);

        homeButton.onClick = [this] { owner.homeButtonClicked(); };
        addAndMakeVisible (homeButton);

        addAndMakeVisible (settingsButton);
        settingsButton.onClick = [this] { owner.settingsButtonClicked(); };

        lookAndFeelChanged();
    }

    void paint (Graphics& g) override
    {
        g.fillAll (owner.getSidePanel().findColour (SidePanel::backgroundColour));
    }

    void resized() override
    {
        auto bounds = getLocalBounds();
        auto buttonWidth = owner.getSidePanel().getTitleBarHeight();

        bounds.removeFromLeft (10);
        homeButton.setBounds (bounds.removeFromLeft (buttonWidth).reduced (7));
        settingsButton.setBounds (bounds.removeFromLeft (buttonWidth).reduced (7));
        bounds.removeFromLeft (10);

        bounds.removeFromRight (10);
        titleLabel.setBounds (bounds);
    }

    void lookAndFeelChanged() override
    {
        auto& sidePanel = owner.getSidePanel();
        auto& lf = sidePanel.getLookAndFeel();

        titleLabel.setFont (lf.getSidePanelTitleFont (sidePanel));
        titleLabel.setJustificationType (lf.getSidePanelTitleJustification (sidePanel));
        titleLabel.setColour (Label::textColourId, owner.findColour (SidePanel::titleTextColour));

        auto normal = sidePanel.findColour (SidePanel::dismissButtonNormalColour);
        auto over = sidePanel.findColour (SidePanel::dismissButtonOverColour);
        auto down = sidePanel.findColour (SidePanel::dismissButtonDownColour);

        homeButton.setColours (normal, over, down);
        settingsButton.setColours (normal, over, down);
    }

    MainComponent& owner;
    Label titleLabel;
    ShapeButton homeButton      { "Home", Colours::transparentBlack, Colours::transparentBlack, Colours::transparentBlack },
                settingsButton  { "Settings", Colours::transparentBlack, Colours::transparentBlack, Colours::transparentBlack };
};

//==============================================================================
class DemoList    : public Component,
                    public ListBoxModel
{
public:
    DemoList (DemoContentComponent& holder)
        : demoHolder (holder)
    {
        addAndMakeVisible (demos);
        demos.setModel (this);
        demos.setRowHeight (40);
    }

    void resized() override
    {
        demos.setBounds (getLocalBounds());
    }

    //==============================================================================
    void paintListBoxItem (int rowNumber, Graphics& g, int width, int height, bool rowIsSelected) override
    {
        Rectangle<int> bounds (0, 0, width, height);

        auto textColour = findColour (Label::textColourId);

        g.setColour (textColour.withAlpha (0.4f));

        if (rowNumber == 0)
            g.fillRect (bounds.removeFromTop (2).reduced (7, 0));

        g.fillRect (bounds.removeFromBottom (2).reduced (7, 0));

        if (rowIsSelected)
        {
            g.setColour (findColour (TextEditor::highlightColourId).withAlpha (0.4f));
            g.fillRect (bounds);
            textColour = findColour (TextEditor::highlightedTextColourId);
        }

        g.setColour (textColour);
        g.drawFittedText (getNameForRow (rowNumber), bounds, Justification::centred, 1);
    }

    int getNumRows() override
    {
        return (int) (selectedCategory.isEmpty() ? JUCEDemos::getCategories().size()
                                                 : JUCEDemos::getCategory (selectedCategory).demos.size());
    }

    String getNameForRow (int rowNumber) override
    {
        if (selectedCategory.isEmpty())
        {
            if (isPositiveAndBelow (rowNumber, JUCEDemos::getCategories().size()))
                return JUCEDemos::getCategories()[(size_t) rowNumber].name;
        }
        else
        {
            auto& category = JUCEDemos::getCategory (selectedCategory);

            if (isPositiveAndBelow (rowNumber, category.demos.size()))
                return category.demos[(size_t) rowNumber].demoFile.getFileName();
        }

        return {};
    }

    void returnKeyPressed (int row) override                       { selectRow (row); }
    void listBoxItemClicked (int row, const MouseEvent&) override  { selectRow (row); }

    //==============================================================================
    void showCategory (const String& categoryName) noexcept
    {
        selectedCategory = categoryName;

        demos.deselectAllRows();
        demos.setHeaderComponent (categoryName.isEmpty() ? nullptr
                                                         : std::make_unique<CategoryListHeaderComponent> (*this));
        demos.updateContent();
    }

private:
    //==============================================================================
    class CategoryListHeaderComponent  : public Button
    {
    public:
        explicit CategoryListHeaderComponent (DemoList& o)
            : Button ({}),
              owner (o)
        {
            setTitle ("Previous");
            setSize (0, 30);
        }

        void paintButton (Graphics& g, bool, bool) override
        {
            g.setColour (findColour (Label::textColourId));
            g.drawFittedText ("<", getLocalBounds().reduced (20, 0), Justification::centredLeft, 1);
        }

        void clicked() override
        {
            owner.showCategory ({});
        }

        using Button::clicked;

    private:
        DemoList& owner;
    };

    //==============================================================================
    void selectRow (int row)
    {
        if (row < 0)
            return;

        if (selectedCategory.isEmpty())
            showCategory (JUCEDemos::getCategories()[(size_t) row].name);
        else
            demoHolder.setDemo (selectedCategory, row);

        if (demos.isShowing())
            selectFirstRow();
    }

    void selectFirstRow()
    {
        if (auto* handler = demos.getAccessibilityHandler())
        {
            for (auto* child : handler->getChildren())
            {
                if (child->getRole() == AccessibilityRole::listItem)
                {
                    child->grabFocus();
                    break;
                }
            }
        }
    }

    //==============================================================================
    String selectedCategory;

    DemoContentComponent& demoHolder;
    ListBox demos;
};

//==============================================================================
MainComponent::MainComponent()
{
    contentComponent.reset (new DemoContentComponent (*this, [this] (bool isHeavyweight)
    {
        demosPanel.showOrHide (false);

        if (isHeavyweight)
        {
           #if JUCE_MAC && USE_COREGRAPHICS_RENDERING
            setRenderingEngine (1);
           #else
            setRenderingEngine (0);
           #endif
        }

        isShowingHeavyweightDemo = isHeavyweight;
        resized();
    }));

    demosPanel.setContent (new DemoList (*contentComponent));
    demosPanel.setTitleBarComponent (new SidePanelHeader (*this), true);

    addAndMakeVisible (contentComponent.get());
    addAndMakeVisible (showDemosButton);
    addAndMakeVisible (demosPanel);

    demosPanel.setTitle ("Demos");
    demosPanel.setFocusContainerType (FocusContainerType::focusContainer);

    showDemosButton.onClick = [this] { demosPanel.showOrHide (true); };

    demosPanel.onPanelMove = [this]
    {
        sidePanelWidth = jmax (0, demosPanel.getRight());

        if (isShowingHeavyweightDemo)
            resized();
    };

    demosPanel.onPanelShowHide = [this] (bool isShowing)
    {
        if (isShowing)
        {
            sidePanelWidth = jmax (0, demosPanel.getWidth());

            if (isShowingHeavyweightDemo)
                resized();

            if (auto* handler = demosPanel.getAccessibilityHandler())
                handler->grabFocus();
        }
        else
        {
            sidePanelWidth = 0;

            if (isShowingHeavyweightDemo)
                Timer::callAfterDelay (250, [this] { resized(); });
        }
    };

    contentComponent->showHomeScreen();

    setOpaque (true);
    setSize (800, 800);
}

MainComponent::~MainComponent()
{
    contentComponent->clearCurrentDemo();
}

//==============================================================================
void MainComponent::paint (Graphics& g)
{
    g.fillAll (findColour (ResizableWindow::backgroundColourId));
}

void MainComponent::resized()
{
    auto safeBounds = [this]
    {
        auto bounds = getLocalBounds();

        if (auto* display = Desktop::getInstance().getDisplays().getDisplayForRect (getScreenBounds()))
            return display->safeAreaInsets.subtractedFrom (display->keyboardInsets.subtractedFrom (bounds));

        return bounds;
    }();

    showDemosButton.setBounds (safeBounds.getX(), safeBounds.getY(), 150, contentComponent->getTabBarDepth());

    if (isShowingHeavyweightDemo)
    {
        safeBounds.removeFromLeft (sidePanelWidth);
        contentComponent->setTabBarIndent (jmax (0, 150 - sidePanelWidth));
    }
    else
    {
        contentComponent->setTabBarIndent (150);
    }

    contentComponent->setBounds (safeBounds);
}

void MainComponent::homeButtonClicked()
{
    if (auto* list = dynamic_cast<DemoList*> (demosPanel.getContent()))
        list->showCategory ({});

    if (contentComponent != nullptr)
    {
        if (contentComponent->isShowingHomeScreen())
            return;

        contentComponent->showHomeScreen();

        if (isShowingHeavyweightDemo)
        {
            isShowingHeavyweightDemo = false;
            resized();
        }
    }
}

void MainComponent::settingsButtonClicked()
{
    if (contentComponent != nullptr)
        contentComponent->setCurrentTabIndex (2);
}

void MainComponent::setRenderingEngine (int renderingEngineIndex)
{
    if (renderingEngineIndex != currentRenderingEngineIdx)
        updateRenderingEngine (renderingEngineIndex);
}

void MainComponent::parentHierarchyChanged()
{
    auto* newPeer = getPeer();

    if (peer != newPeer)
    {
        peer = newPeer;

        auto previousRenderingEngine = renderingEngines[currentRenderingEngineIdx];

        renderingEngines.clear();
        if (peer != nullptr)
            renderingEngines = peer->getAvailableRenderingEngines();

        renderingEngines.add ("OpenGL Renderer");

        currentRenderingEngineIdx = renderingEngines.indexOf (previousRenderingEngine);

        if (currentRenderingEngineIdx < 0)
        {
           #if JUCE_ANDROID
            currentRenderingEngineIdx = (renderingEngines.size() - 1);
           #else
            currentRenderingEngineIdx = peer->getCurrentRenderingEngine();
           #endif
        }

        updateRenderingEngine (currentRenderingEngineIdx);
    }
}

void MainComponent::updateRenderingEngine (int renderingEngineIndex)
{
    if (renderingEngineIndex == (renderingEngines.size() - 1))
    {
        if (isShowingHeavyweightDemo)
            return;

        openGLContext.attachTo (*getTopLevelComponent());
    }
    else
    {
        openGLContext.detach();
        peer->setCurrentRenderingEngine (renderingEngineIndex);
    }

    currentRenderingEngineIdx = renderingEngineIndex;
}