JUCE/modules/juce_gui_basics/properties/juce_ChoicePropertyComponent.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.

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

namespace juce
{

//==============================================================================
class ChoiceRemapperValueSource  : public Value::ValueSource,
                                   private Value::Listener
{
public:
    ChoiceRemapperValueSource (const Value& source, const Array<var>& map)
       : sourceValue (source),
         mappings (map)
    {
        sourceValue.addListener (this);
    }

    var getValue() const override
    {
        auto targetValue = sourceValue.getValue();

        for (auto& map : mappings)
            if (map.equalsWithSameType (targetValue))
                return mappings.indexOf (map) + 1;

        return mappings.indexOf (targetValue) + 1;
    }

    void setValue (const var& newValue) override
    {
        auto remappedVal = mappings [static_cast<int> (newValue) - 1];

        if (! remappedVal.equalsWithSameType (sourceValue))
            sourceValue = remappedVal;
    }

protected:
    Value sourceValue;
    Array<var> mappings;

    void valueChanged (Value&) override    { sendChangeMessage (true); }

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChoiceRemapperValueSource)
};

//==============================================================================
class ChoiceRemapperValueSourceWithDefault  : public Value::ValueSource,
                                              private Value::Listener
{
public:
    ChoiceRemapperValueSourceWithDefault (const ValueTreePropertyWithDefault& v, const Array<var>& map)
        : value (v),
          sourceValue (value.getPropertyAsValue()),
          mappings (map)
    {
        sourceValue.addListener (this);
    }

    var getValue() const override
    {
        if (! value.isUsingDefault())
        {
            const auto target = sourceValue.getValue();
            const auto equalsWithSameType = [&target] (const var& map) { return map.equalsWithSameType (target); };

            auto iter = std::find_if (mappings.begin(), mappings.end(), equalsWithSameType);

            if (iter == mappings.end())
                iter = std::find (mappings.begin(), mappings.end(), target);

            if (iter != mappings.end())
                return 1 + (int) std::distance (mappings.begin(), iter);
        }

        return -1;
    }

    void setValue (const var& newValue) override
    {
        auto newValueInt = static_cast<int> (newValue);

        if (newValueInt == -1)
        {
            value.resetToDefault();
        }
        else
        {
            auto remappedVal = mappings [newValueInt - 1];

            if (! remappedVal.equalsWithSameType (sourceValue))
                value = remappedVal;
        }
    }

private:
    void valueChanged (Value&) override { sendChangeMessage (true); }

    ValueTreePropertyWithDefault value;
    Value sourceValue;
    Array<var> mappings;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChoiceRemapperValueSourceWithDefault)
};

//==============================================================================
ChoicePropertyComponent::ChoicePropertyComponent (const String& name)
    : PropertyComponent (name),
      isCustomClass (true)
{
}

ChoicePropertyComponent::ChoicePropertyComponent (const String& name,
                                                  const StringArray& choiceList,
                                                  const Array<var>& correspondingValues)
    : PropertyComponent (name),
      choices (choiceList)
{
    // The array of corresponding values must contain one value for each of the items in
    // the choices array!
    jassertquiet (correspondingValues.size() == choices.size());
}

ChoicePropertyComponent::ChoicePropertyComponent (const Value& valueToControl,
                                                  const String& name,
                                                  const StringArray& choiceList,
                                                  const Array<var>& correspondingValues)
    : ChoicePropertyComponent (name, choiceList, correspondingValues)
{
    refreshChoices();
    initialiseComboBox (Value (new ChoiceRemapperValueSource (valueToControl, correspondingValues)));
}

ChoicePropertyComponent::ChoicePropertyComponent (const ValueTreePropertyWithDefault& valueToControl,
                                                  const String& name,
                                                  const StringArray& choiceList,
                                                  const Array<var>& correspondingValues)
    : ChoicePropertyComponent (name, choiceList, correspondingValues)
{
    value = valueToControl;

    auto getDefaultString = [this, correspondingValues] { return choices [correspondingValues.indexOf (value.getDefault())]; };

    refreshChoices (getDefaultString());
    initialiseComboBox (Value (new ChoiceRemapperValueSourceWithDefault (value, correspondingValues)));

    value.onDefaultChange = [this, getDefaultString]
    {
        auto selectedId = comboBox.getSelectedId();
        refreshChoices (getDefaultString());
        comboBox.setSelectedId (selectedId);
    };
}

ChoicePropertyComponent::ChoicePropertyComponent (const ValueTreePropertyWithDefault& valueToControl,
                                                  const String& name)
    : PropertyComponent (name),
      choices ({ "Enabled", "Disabled" })
{
    value = valueToControl;

    auto getDefaultString = [this] { return value.getDefault() ? "Enabled" : "Disabled"; };

    refreshChoices (getDefaultString());
    initialiseComboBox (Value (new ChoiceRemapperValueSourceWithDefault (value, { true, false })));

    value.onDefaultChange = [this, getDefaultString]
    {
        auto selectedId = comboBox.getSelectedId();
        refreshChoices (getDefaultString());
        comboBox.setSelectedId (selectedId);
    };
}

//==============================================================================
void ChoicePropertyComponent::initialiseComboBox (const Value& v)
{
    if (v != Value())
        comboBox.setSelectedId (v.getValue(), dontSendNotification);

    comboBox.getSelectedIdAsValue().referTo (v);
    comboBox.setEditableText (false);
    addAndMakeVisible (comboBox);
}

void ChoicePropertyComponent::refreshChoices()
{
    comboBox.clear();

    for (int i = 0; i < choices.size(); ++i)
    {
        const auto& choice = choices[i];

        if (choice.isNotEmpty())
            comboBox.addItem (choice, i + 1);
        else
            comboBox.addSeparator();
    }
}

void ChoicePropertyComponent::refreshChoices (const String& defaultString)
{
    refreshChoices();
    comboBox.addItem ("Default" + (defaultString.isNotEmpty() ? " (" + defaultString + ")" : ""), -1);
}

//==============================================================================
void ChoicePropertyComponent::setIndex (const int /*newIndex*/)
{
    jassertfalse; // you need to override this method in your subclass!
}

int ChoicePropertyComponent::getIndex() const
{
    jassertfalse; // you need to override this method in your subclass!
    return -1;
}

const StringArray& ChoicePropertyComponent::getChoices() const
{
    return choices;
}

//==============================================================================
void ChoicePropertyComponent::refresh()
{
    if (isCustomClass)
    {
        if (! comboBox.isVisible())
        {
            refreshChoices();
            initialiseComboBox ({});
            comboBox.onChange = [this] { changeIndex(); };
        }

        comboBox.setSelectedId (getIndex() + 1, dontSendNotification);
    }
}

void ChoicePropertyComponent::changeIndex()
{
    if (isCustomClass)
    {
        auto newIndex = comboBox.getSelectedId() - 1;

        if (newIndex != getIndex())
            setIndex (newIndex);
    }
}

} // namespace juce