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

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

   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.

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

#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 (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;
}