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

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   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 "DemoContentComponent.h"
#include "SettingsContent.h"
#include "MainComponent.h"

//==============================================================================
struct DemoContent    : public Component
{
    DemoContent() noexcept    {}

    void resized() override
    {
        if (comp != nullptr)
            comp->setBounds (getLocalBounds());
    }

    void setComponent (Component* newComponent)
    {
        comp.reset (newComponent);

        if (comp != nullptr)
        {
            addAndMakeVisible (comp.get());
            resized();
        }
    }

    Component* getComponent() const noexcept    { return comp.get(); }
    void showHomeScreen()                       { setComponent (createIntroDemo()); }

private:
    std::unique_ptr<Component> comp;
};

//==============================================================================
#if ! (JUCE_ANDROID || JUCE_IOS)
struct CodeContent    : public Component
{
    CodeContent()
    {
        addAndMakeVisible (codeEditor);

        codeEditor.setReadOnly (true);
        codeEditor.setScrollbarThickness (8);

        lookAndFeelChanged();
    }

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

    void setDefaultCodeContent()
    {
        document.replaceAllContent ("\n/*******************************************************************************\n"
                                    "          Select one of the demos from the side panel on the left to see\n"
                                    "            its code here and an instance running in the \"Demo\" tab!\n"
                                    "*******************************************************************************/\n");
    }

    void lookAndFeelChanged() override
    {
        auto* v4 = dynamic_cast <LookAndFeel_V4*> (&Desktop::getInstance().getDefaultLookAndFeel());

        if (v4 != nullptr && (v4->getCurrentColourScheme() != LookAndFeel_V4::getLightColourScheme()))
            codeEditor.setColourScheme (getDarkColourScheme());
        else
            codeEditor.setColourScheme (getLightColourScheme());
    }

    CodeDocument document;
    CPlusPlusCodeTokeniser cppTokensier;
    CodeEditorComponent codeEditor  { document, &cppTokensier };
};
#endif

//==============================================================================
DemoContentComponent::DemoContentComponent (Component& mainComponent, std::function<void (bool)> callback)
    : TabbedComponent (TabbedButtonBar::Orientation::TabsAtTop),
      demoChangedCallback (std::move (callback))
{
    demoContent.reset (new DemoContent());
    addTab ("Demo",     Colours::transparentBlack, demoContent.get(), false);

   #if ! (JUCE_ANDROID || JUCE_IOS)
    codeContent.reset (new CodeContent());
    addTab ("Code",     Colours::transparentBlack, codeContent.get(), false);
   #endif

    addTab ("Settings", Colours::transparentBlack, new SettingsContent (dynamic_cast<MainComponent&> (mainComponent)), true);

    setTabBarDepth (40);
    lookAndFeelChanged();
}

DemoContentComponent::~DemoContentComponent()
{
}

void DemoContentComponent::resized()
{
    TabbedComponent::resized();

    if (tabBarIndent > 0)
        getTabbedButtonBar().setBounds (getTabbedButtonBar().getBounds().withTrimmedLeft (tabBarIndent));
}

void DemoContentComponent::setDemo (const String& category, int selectedDemoIndex)
{
    if ((currentDemoCategory == category)
        && (currentDemoIndex == selectedDemoIndex))
        return;

    auto demo = JUCEDemos::getCategory (category).demos[(size_t) selectedDemoIndex];

   #if ! (JUCE_ANDROID || JUCE_IOS)
    codeContent->document.replaceAllContent (trimPIP (demo.demoFile.loadFileAsString()));
    codeContent->codeEditor.scrollToLine (0);
   #endif

    auto* content = demo.callback();
    demoContent->setComponent (content);
    demoChangedCallback (demo.isHeavyweight);

    ensureDemoIsShowing();

    currentDemoCategory = category;
    currentDemoIndex = selectedDemoIndex;
}

bool DemoContentComponent::isShowingHomeScreen() const noexcept
{
    return isComponentIntroDemo (demoContent->getComponent()) && getCurrentTabIndex() == 0;
}

void DemoContentComponent::showHomeScreen()
{
    demoContent->showHomeScreen();

   #if ! (JUCE_ANDROID || JUCE_IOS)
    codeContent->setDefaultCodeContent();
   #endif

    demoChangedCallback (false);

    ensureDemoIsShowing();

    resized();

    currentDemoCategory = {};
    currentDemoIndex = -1;
}

void DemoContentComponent::clearCurrentDemo()
{
    demoContent->setComponent (nullptr);
    demoChangedCallback (false);
}

void DemoContentComponent::lookAndFeelChanged()
{
    auto backgroundColour = findColour (ResizableWindow::backgroundColourId);

    for (int i = 0; i < getNumTabs(); ++i)
        setTabBackgroundColour (i, backgroundColour);
}

String DemoContentComponent::trimPIP (const String& fileContents)
{
    auto lines = StringArray::fromLines (fileContents);

    auto metadataEndIndex = lines.indexOf (" END_JUCE_PIP_METADATA");

    if (metadataEndIndex == -1)
        return fileContents;

    lines.removeRange (0, metadataEndIndex + 3); // account for newline and comment block end

    return lines.joinIntoString ("\n");
}

void DemoContentComponent::ensureDemoIsShowing()
{
    if (getCurrentTabIndex() == (getNumTabs() - 1))
        setCurrentTabIndex (0);
}