JUCE/extras/Projucer/Source/ComponentEditor/Properties/jucer_ComponentColourProperty.h

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

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

   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 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-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.

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

#pragma once

#include "jucer_ColourPropertyComponent.h"

//==============================================================================
template <class ComponentType>
class ComponentColourProperty  : public JucerColourPropertyComponent,
                                 private ChangeListener
{
public:
    ComponentColourProperty (const String& name,
                             ComponentType* comp,
                             JucerDocument& doc,
                             const bool canResetToDefault)
        : JucerColourPropertyComponent (name, canResetToDefault),
          component (comp),
          document (doc)
    {
        document.addChangeListener (this);
    }

    ~ComponentColourProperty()
    {
        document.removeChangeListener (this);
    }

    void changeListenerCallback (ChangeBroadcaster*)
    {
        refresh();
    }

protected:
    ComponentType* component;
    JucerDocument& document;
};


//==============================================================================
class ComponentColourIdProperty : public ComponentColourProperty <Component>
{
public:
    //==============================================================================
    ComponentColourIdProperty (Component* const comp,
                               JucerDocument& doc,
                               const int colourId_,
                               const String& name,
                               const bool canResetToDefault)
        : ComponentColourProperty <Component> (name, comp, doc, canResetToDefault),
          colourId (colourId_)
    {
    }

    //==============================================================================
    Colour getColour() const
    {
        return component->findColour (colourId);
    }

    void setColour (Colour newColour)
    {
        if (component->findColour (colourId) != newColour)
        {
            document.getUndoManager().undoCurrentTransactionOnly();

            document.perform (new ColourChangeAction (component,
                                                      *document.getComponentLayout(),
                                                      colourId,
                                                      newColour,
                                                      false),
                              "Change colour");
        }
    }

    void resetToDefault()
    {
        document.getUndoManager().undoCurrentTransactionOnly();

        document.perform (new ColourChangeAction (component,
                                                  *document.getComponentLayout(),
                                                  colourId,
                                                  Colours::black,
                                                  true),
                          "Reset colour");
    }

private:
    const int colourId;

    class ColourChangeAction  : public ComponentUndoableAction <Component>
    {
    public:
        ColourChangeAction (Component* const comp,
                            ComponentLayout& l,
                            const int colourId_,
                            Colour newColour_,
                            const bool newColourIsDefault)
            : ComponentUndoableAction<Component> (comp, l),
              colourId (colourId_),
              newColour (newColour_),
              isDefault (newColourIsDefault)
        {
        }

        bool perform()
        {
            showCorrectTab();

            wasSpecified = getComponent()->isColourSpecified (colourId);
            oldColour = getComponent()->findColour (colourId);

            if (isDefault)
                getComponent()->removeColour (colourId);
            else
                getComponent()->setColour (colourId, newColour);

            changed();
            return true;
        }

        bool undo()
        {
            showCorrectTab();

            if (wasSpecified)
                getComponent()->setColour (colourId, oldColour);
            else
                getComponent()->removeColour (colourId);

            if (TextEditor* const te = dynamic_cast<TextEditor*> (getComponent()))
                te->applyFontToAllText (te->getFont());

            changed();
            return true;
        }

        int colourId;
        Colour newColour, oldColour;
        bool isDefault, wasSpecified;
    };
};