juce_PropertyPanel.cpp

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 /*
  ==============================================================================
 
   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.
 
  ==============================================================================
*/
 
namespace juce
{
 
struct PropertyPanel::SectionComponent final : public Component
{
    SectionComponent (const String& sectionTitle,
                      const Array<PropertyComponent*>& newProperties,
                      bool sectionIsOpen,
                      int extraPadding)
        : Component (sectionTitle),
          isOpen (sectionIsOpen),
          padding (extraPadding)
    {
        lookAndFeelChanged();
 
        propertyComps.addArray (newProperties);
 
        for (auto* propertyComponent : propertyComps)
        {
            addAndMakeVisible (propertyComponent);
            propertyComponent->refresh();
        }
    }
 
    ~SectionComponent() override
    {
        propertyComps.clear();
    }
 
    void paint (Graphics& g) override
    {
        if (titleHeight > 0)
            getLookAndFeel().drawPropertyPanelSectionHeader (g, getName(), isOpen, getWidth(), titleHeight);
    }
 
    void resized() override
    {
        auto y = titleHeight;
 
        for (auto* propertyComponent : propertyComps)
        {
            propertyComponent->setBounds (1, y, getWidth() - 2, propertyComponent->getPreferredHeight());
            y = propertyComponent->getBottom() + padding;
        }
    }
 
    void lookAndFeelChanged() override
    {
        titleHeight = getLookAndFeel().getPropertyPanelSectionHeaderHeight (getName());
        resized();
        repaint();
    }
 
    int getPreferredHeight() const
    {
        auto y = titleHeight;
 
        auto numComponents = propertyComps.size();
 
        if (numComponents > 0 && isOpen)
        {
            for (auto* propertyComponent : propertyComps)
                y += propertyComponent->getPreferredHeight();
 
            y += (numComponents - 1) * padding;
        }
 
        return y;
    }
 
    void setOpen (bool open)
    {
        if (isOpen != open)
        {
            isOpen = open;
 
            for (auto* propertyComponent : propertyComps)
                propertyComponent->setVisible (open);
 
            if (auto* propertyPanel = findParentComponentOfClass<PropertyPanel>())
                propertyPanel->resized();
        }
    }
 
    void refreshAll() const
    {
        for (auto* propertyComponent : propertyComps)
            propertyComponent->refresh();
    }
 
    void mouseUp (const MouseEvent& e) override
    {
        if (e.getMouseDownX() < titleHeight
              && e.x < titleHeight
              && e.getNumberOfClicks() != 2)
            mouseDoubleClick (e);
    }
 
    void mouseDoubleClick (const MouseEvent& e) override
    {
        if (e.y < titleHeight)
            setOpen (! isOpen);
    }
 
    OwnedArray<PropertyComponent> propertyComps;
    int titleHeight;
    bool isOpen;
    int padding;
 
    JUCE_DECLARE_NON_COPYABLE (SectionComponent)
};
 
//==============================================================================
struct PropertyPanel::PropertyHolderComponent final : public Component
{
    PropertyHolderComponent() {}
 
    void paint (Graphics&) override {}
 
    void updateLayout (int width)
    {
        auto y = 0;
 
        for (auto* section : sections)
        {
            section->setBounds (0, y, width, section->getPreferredHeight());
            y = section->getBottom();
        }
 
        setSize (width, y);
        repaint();
    }
 
    void refreshAll() const
    {
        for (auto* section : sections)
            section->refreshAll();
    }
 
    void insertSection (int indexToInsertAt, SectionComponent* newSection)
    {
        sections.insert (indexToInsertAt, newSection);
        addAndMakeVisible (newSection, 0);
    }
 
    SectionComponent* getSectionWithNonEmptyName (int targetIndex) const noexcept
    {
        auto index = 0;
        for (auto* section : sections)
        {
            if (section->getName().isNotEmpty())
                if (index++ == targetIndex)
                    return section;
        }
 
        return nullptr;
    }
 
    OwnedArray<SectionComponent> sections;
 
    JUCE_DECLARE_NON_COPYABLE (PropertyHolderComponent)
};
 
 
//==============================================================================
PropertyPanel::PropertyPanel()
{
    init();
}
 
PropertyPanel::PropertyPanel (const String& name)  : Component (name)
{
    init();
}
 
void PropertyPanel::init()
{
    messageWhenEmpty = TRANS ("(nothing selected)");
 
    addAndMakeVisible (viewport);
    viewport.setViewedComponent (propertyHolderComponent = new PropertyHolderComponent());
    viewport.setFocusContainerType (FocusContainerType::keyboardFocusContainer);
}
 
PropertyPanel::~PropertyPanel()
{
    clear();
}
 
//==============================================================================
void PropertyPanel::paint (Graphics& g)
{
    if (isEmpty())
    {
        g.setColour (Colours::black.withAlpha (0.5f));
        g.setFont (14.0f);
        g.drawText (messageWhenEmpty, getLocalBounds().withHeight (30),
                    Justification::centred, true);
    }
}
 
void PropertyPanel::resized()
{
    viewport.setBounds (getLocalBounds());
    updatePropHolderLayout();
}
 
//==============================================================================
void PropertyPanel::clear()
{
    if (! isEmpty())
    {
        propertyHolderComponent->sections.clear();
        updatePropHolderLayout();
    }
}
 
bool PropertyPanel::isEmpty() const
{
    return propertyHolderComponent->sections.size() == 0;
}
 
int PropertyPanel::getTotalContentHeight() const
{
    return propertyHolderComponent->getHeight();
}
 
void PropertyPanel::addProperties (const Array<PropertyComponent*>& newProperties,
                                   int extraPaddingBetweenComponents)
{
    if (isEmpty())
        repaint();
 
    propertyHolderComponent->insertSection (-1, new SectionComponent ({}, newProperties, true, extraPaddingBetweenComponents));
    updatePropHolderLayout();
}
 
void PropertyPanel::addSection (const String& sectionTitle,
                                const Array<PropertyComponent*>& newProperties,
                                bool shouldBeOpen,
                                int indexToInsertAt,
                                int extraPaddingBetweenComponents)
{
    jassert (sectionTitle.isNotEmpty());
 
    if (isEmpty())
        repaint();
 
    propertyHolderComponent->insertSection (indexToInsertAt, new SectionComponent (sectionTitle,
                                                                                   newProperties,
                                                                                   shouldBeOpen,
                                                                                   extraPaddingBetweenComponents));
 
    updatePropHolderLayout();
}
 
void PropertyPanel::updatePropHolderLayout() const
{
    auto maxWidth = viewport.getMaximumVisibleWidth();
    propertyHolderComponent->updateLayout (maxWidth);
 
    auto newMaxWidth = viewport.getMaximumVisibleWidth();
    if (maxWidth != newMaxWidth)
    {
        // need to do this twice because of scrollbars changing the size, etc.
        propertyHolderComponent->updateLayout (newMaxWidth);
    }
}
 
void PropertyPanel::refreshAll() const
{
    propertyHolderComponent->refreshAll();
}
 
//==============================================================================
StringArray PropertyPanel::getSectionNames() const
{
    StringArray s;
 
    for (auto* section : propertyHolderComponent->sections)
    {
        if (section->getName().isNotEmpty())
            s.add (section->getName());
    }
 
    return s;
}
 
bool PropertyPanel::isSectionOpen (int sectionIndex) const
{
    if (auto* s = propertyHolderComponent->getSectionWithNonEmptyName (sectionIndex))
        return s->isOpen;
 
    return false;
}
 
void PropertyPanel::setSectionOpen (int sectionIndex, bool shouldBeOpen)
{
    if (auto* s = propertyHolderComponent->getSectionWithNonEmptyName (sectionIndex))
        s->setOpen (shouldBeOpen);
}
 
void PropertyPanel::setSectionEnabled (int sectionIndex, bool shouldBeEnabled)
{
    if (auto* s = propertyHolderComponent->getSectionWithNonEmptyName (sectionIndex))
        s->setEnabled (shouldBeEnabled);
}
 
void PropertyPanel::removeSection (int sectionIndex)
{
    if (auto* s = propertyHolderComponent->getSectionWithNonEmptyName (sectionIndex))
    {
        propertyHolderComponent->sections.removeObject (s);
        updatePropHolderLayout();
    }
}
 
//==============================================================================
std::unique_ptr<XmlElement> PropertyPanel::getOpennessState() const
{
    auto xml = std::make_unique<XmlElement> ("PROPERTYPANELSTATE");
 
    xml->setAttribute ("scrollPos", viewport.getViewPositionY());
 
    auto sections = getSectionNames();
    for (auto s : sections)
    {
        if (s.isNotEmpty())
        {
            auto* e = xml->createNewChildElement ("SECTION");
            e->setAttribute ("name", s);
            e->setAttribute ("open", isSectionOpen (sections.indexOf (s)) ? 1 : 0);
        }
    }
 
    return xml;
}
 
void PropertyPanel::restoreOpennessState (const XmlElement& xml)
{
    if (xml.hasTagName ("PROPERTYPANELSTATE"))
    {
        auto sections = getSectionNames();
 
        for (auto* e : xml.getChildWithTagNameIterator ("SECTION"))
        {
            setSectionOpen (sections.indexOf (e->getStringAttribute ("name")),
                            e->getBoolAttribute ("open"));
        }
 
        viewport.setViewPosition (viewport.getViewPositionX(),
                                  xml.getIntAttribute ("scrollPos", viewport.getViewPositionY()));
    }
}
 
//==============================================================================
void PropertyPanel::setMessageWhenEmpty (const String& newMessage)
{
    if (messageWhenEmpty != newMessage)
    {
        messageWhenEmpty = newMessage;
        repaint();
    }
}
 
const String& PropertyPanel::getMessageWhenEmpty() const noexcept
{
    return messageWhenEmpty;
}
 
} // namespace juce