JUCE/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_PaintElementUndoableAction.h

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

   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.

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

#pragma once

#include "../UI/jucer_JucerDocumentEditor.h"
#include "jucer_PaintElementGroup.h"

//==============================================================================
template <class ElementType>
class PaintElementUndoableAction    : public UndoableAction
{
public:
    PaintElementUndoableAction (ElementType* const element)
        : routine (*element->getOwner()),
          elementIndex (element->getOwner()->indexOfElement (element))
    {
        jassert (element != nullptr);

        if (elementIndex < 0)
            findGroupIndices (element->getOwner(), element);

        jassert (elementIndex >= 0);
    }

    ElementType* getElement() const
    {
        if (containerGroups.size() > 0)
        {
            auto group = dynamic_cast<PaintElementGroup*> (routine.getElement (containerGroups.getFirst()));

            if (group == nullptr)
                return nullptr;

            for (int i = 1; i < containerGroups.size(); ++i)
            {
                group = dynamic_cast<PaintElementGroup*> (group->getElement (containerGroups.getUnchecked(i)));

                if (group == nullptr)
                    return nullptr;
            }

            auto e = dynamic_cast<ElementType*> (group->getElement (elementIndex));
            jassert (e != nullptr);
            return e;
        }
        else
        {
            auto e = dynamic_cast<ElementType*> (routine.getElement (elementIndex));
            jassert (e != nullptr);
            return e;
        }
    }

    int getSizeInUnits()    { return 2; }

protected:
    PaintRoutine& routine;
    int elementIndex;
    Array <int> containerGroups;

    void changed() const
    {
        jassert (routine.getDocument() != 0);
        routine.getDocument()->changed();
    }

    void showCorrectTab() const
    {
        if (JucerDocumentEditor* const docHolder = JucerDocumentEditor::getActiveDocumentHolder())
            docHolder->showGraphics (&routine);

        if (routine.getSelectedElements().getNumSelected() == 0)
            if (ElementType* const e = dynamic_cast<ElementType*> (routine.getElement (elementIndex)))
                routine.getSelectedElements().selectOnly (e);
    }

private:
    void findGroupIndices (PaintRoutine* const pr, PaintElement* const element)
    {
        for (int i = pr->getNumElements(); --i >= 0;)
        {
            if (auto pg = dynamic_cast<PaintElementGroup*> (pr->getElement (i)))
            {
                if (pg->containsElement (element))
                {
                    containerGroups.add (i);
                    findGroupIndices (pg, element);
                }
            }
        }
    }

    void findGroupIndices (PaintElementGroup* const group, PaintElement* const element)
    {
        elementIndex = group->indexOfElement (element);

        if (elementIndex < 0)
        {
            for (int i = group->getNumElements(); --i >= 0;)
            {
                if (auto pg = dynamic_cast<PaintElementGroup*> (group->getElement (i)))
                {
                    if (pg->containsElement (element))
                    {
                        containerGroups.add (i);
                        findGroupIndices (pg, element);
                    }
                }
            }
        }
    }

    PaintElementUndoableAction (const PaintElementUndoableAction&);
    PaintElementUndoableAction& operator= (const PaintElementUndoableAction&);
};