JUCE/examples/DemoRunner/Source/Demos/JUCEDemos.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   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.

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

#include <JuceHeader.h>
#include "../../../Assets/DemoUtilities.h"
#include "JUCEDemos.h"

//==============================================================================
std::vector<JUCEDemos::DemoCategory>& JUCEDemos::getCategories()
{
    static std::vector<DemoCategory> categories;
    return categories;
}

JUCEDemos::DemoCategory& JUCEDemos::getCategory (const String& name)
{
    auto& categories = getCategories();

    for (auto& c : categories)
        if (c.name == name)
            return c;

    std::vector<FileAndCallback> fc;
    categories.push_back ({ name, fc });

    return categories.back();
}

void JUCEDemos::registerDemo (std::function<Component*()> constructorCallback, const String& filePath, const String& category, bool isHeavyweight)
{
   #if JUCE_MAC
    auto f = File::getSpecialLocation (File::currentExecutableFile)
                  .getParentDirectory().getParentDirectory().getChildFile ("Resources");
   #else
    auto f = findExamplesDirectoryFromExecutable (File::getSpecialLocation (File::currentApplicationFile));
   #endif

    #if ! (JUCE_ANDROID || JUCE_IOS)
    if (f == File())
    {
        jassertfalse;
        return;
    }
    #endif

    getCategory (category).demos.push_back ({ f.getChildFile (filePath), constructorCallback, isHeavyweight });
}

File JUCEDemos::findExamplesDirectoryFromExecutable (File exec)
{
    int numTries = 15;
    auto exampleDir = exec.getParentDirectory().getChildFile ("examples");

    if (exampleDir.exists())
        return exampleDir;

    while (exec.getFileName() != "examples" && numTries-- > 0)
        exec = exec.getParentDirectory();
    if (exec.getFileName() == "examples")
        return exec;
    return {};
}

//==============================================================================
static String getCurrentDefaultAudioDeviceName (AudioDeviceManager& deviceManager, bool isInput)
{
    auto* deviceType = deviceManager.getCurrentDeviceTypeObject();
    jassert (deviceType != nullptr);

    if (deviceType != nullptr)
    {
        auto deviceNames = deviceType->getDeviceNames();
        return deviceNames [deviceType->getDefaultDeviceIndex (isInput)];
    }

    return {};
}

// (returns a shared AudioDeviceManager object that all the demos can use)
AudioDeviceManager& getSharedAudioDeviceManager (int numInputChannels, int numOutputChannels)
{
    if (sharedAudioDeviceManager == nullptr)
        sharedAudioDeviceManager.reset (new AudioDeviceManager());

    auto* currentDevice = sharedAudioDeviceManager->getCurrentAudioDevice();

    if (numInputChannels < 0)
        numInputChannels = (currentDevice != nullptr ? currentDevice->getActiveInputChannels().countNumberOfSetBits() : 1);

    if (numOutputChannels < 0)
        numOutputChannels = (currentDevice != nullptr ? currentDevice->getActiveOutputChannels().countNumberOfSetBits() : 2);

    if (numInputChannels > 0 && ! RuntimePermissions::isGranted (RuntimePermissions::recordAudio))
    {
        RuntimePermissions::request (RuntimePermissions::recordAudio,
                                     [numInputChannels, numOutputChannels] (bool granted)
                                     {
                                         if (granted)
                                             getSharedAudioDeviceManager (numInputChannels, numOutputChannels);
                                     });

        numInputChannels = 0;
    }

    if (sharedAudioDeviceManager->getCurrentAudioDevice() != nullptr)
    {
        auto setup = sharedAudioDeviceManager->getAudioDeviceSetup();

        auto numInputs  = jmax (numInputChannels,  setup.inputChannels.countNumberOfSetBits());
        auto numOutputs = jmax (numOutputChannels, setup.outputChannels.countNumberOfSetBits());

        auto oldInputs  = setup.inputChannels.countNumberOfSetBits();
        auto oldOutputs = setup.outputChannels.countNumberOfSetBits();

        if (oldInputs != numInputs || oldOutputs != numOutputs)
        {
            if (oldInputs == 0 && oldOutputs == 0)
            {
                sharedAudioDeviceManager->initialise (numInputChannels, numOutputChannels, nullptr, true, {}, nullptr);
            }
            else
            {
                setup.useDefaultInputChannels = setup.useDefaultOutputChannels = false;

                setup.inputChannels.clear();
                setup.outputChannels.clear();

                setup.inputChannels.setRange (0, numInputs, true);
                setup.outputChannels.setRange (0, numOutputs, true);

                if (oldInputs == 0 && numInputs > 0 && setup.inputDeviceName.isEmpty())
                    setup.inputDeviceName = getCurrentDefaultAudioDeviceName (*sharedAudioDeviceManager, true);

                if (oldOutputs == 0 && numOutputs > 0 && setup.outputDeviceName.isEmpty())
                    setup.outputDeviceName = getCurrentDefaultAudioDeviceName (*sharedAudioDeviceManager, false);

                sharedAudioDeviceManager->setAudioDeviceSetup (setup, false);
            }
        }
    }
    else
    {
        sharedAudioDeviceManager->initialise (numInputChannels, numOutputChannels, nullptr, true, {}, nullptr);
    }

    return *sharedAudioDeviceManager;
}

//==============================================================================
// need to split this into two files otherwise VS will fall over
void registerDemos_One() noexcept;
void registerDemos_Two() noexcept;

void registerAllDemos() noexcept
{
    registerDemos_One();
    registerDemos_Two();
}