JUCE/extras/Jucer (experimental)/Source/ui/Component Editor/jucer_ComponentEditorCanvas.h

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

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-10 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

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

#ifndef __JUCER_COMPONENTEDITORCANVAS_H_37C33B56__
#define __JUCER_COMPONENTEDITORCANVAS_H_37C33B56__


//==============================================================================
class ComponentEditorCanvas   : public EditorCanvasBase,
                                public Timer
{
public:
    //==============================================================================
    ComponentEditorCanvas (ComponentEditor& editor_)
        : editor (editor_)
    {
        initialise();
        getDocument().getRoot().addListener (this);
    }

    ~ComponentEditorCanvas()
    {
        getDocument().getRoot().removeListener (this);
        shutdown();
    }

    ComponentEditor& getEditor()         { return editor; }
    ComponentDocument& getDocument()     { return editor.getDocument(); }

    void timerCallback()
    {
        stopTimer();

        if (! Component::isMouseButtonDownAnywhere())
            getDocument().beginNewTransaction();
    }

    Component* createComponentHolder()
    {
        return new ComponentHolder (getDocument().getBackgroundColour());
    }

    void documentChanged()
    {
        getDocument().updateComponentsIn (getComponentHolder());
        startTimer (500);
    }

    const Rectangle<int> getCanvasBounds()
    {
        return Rectangle<int> (0, 0, getDocument().getCanvasWidth().getValue(),
                               getDocument().getCanvasHeight().getValue());
    }

    void setCanvasBounds (const Rectangle<int>& newBounds)
    {
        jassert (newBounds.getPosition().isOrigin());

        getDocument().getCanvasWidth() = newBounds.getWidth();
        getDocument().getCanvasHeight() = newBounds.getHeight();
    }

    bool canResizeCanvas() const     { return true; }

    ComponentDocument::MarkerList& getMarkerList (bool isX)
    {
        return getDocument().getMarkerList (isX);
    }

    double limitMarkerPosition (double pos)
    {
        return jmax (0.0, pos);
    }

    const SelectedItems::ItemType findObjectIdAt (const Point<int>& position)
    {
        for (int i = getComponentHolder()->getNumChildComponents(); --i >= 0;)
        {
            Component* const c = getComponentHolder()->getChildComponent(i);
            if (c->getBounds().contains (position))
                return ComponentDocument::getJucerIDFor (c);
        }

        return String::empty;
    }

    void showPopupMenu (bool isClickOnSelectedObject)
    {
        if (isClickOnSelectedObject)
        {
            PopupMenu m;
            m.addCommandItem (commandManager, CommandIDs::toFront);
            m.addCommandItem (commandManager, CommandIDs::toBack);
            m.addSeparator();
            m.addCommandItem (commandManager, StandardApplicationCommandIDs::del);
            const int r = m.show();
            (void) r;
        }
        else
        {
            editor.showNewComponentMenu (0);
        }
    }

    void objectDoubleClicked (const MouseEvent& e, const ValueTree& state)
    {
        getDocument().componentDoubleClicked (e, state);
    }

    const ValueTree getObjectState (const String& objectId)
    {
        return getDocument().getComponentWithID (objectId);
    }

    const Rectangle<int> getObjectPosition (const ValueTree& state)
    {
        return getDocument().getCoordsFor (state).resolve (&getDocument()).getSmallestIntegerContainer();
    }

    bool hasSizeGuides() const  { return true; }

    RelativeRectangle getObjectCoords (const ValueTree& state)
    {
        return getDocument().getCoordsFor (state);
    }

    void updateExtraComponentsForObject (const ValueTree& state, Component* parent, OwnedArray<OverlayItemComponent>& existingComps)
    {
    }

    SelectedItems& getSelection()
    {
        return editor.getSelection();
    }

    void deselectNonDraggableObjects()
    {
        editor.deselectNonComponents();
    }

    void findLassoItemsInArea (Array <SelectedItems::ItemType>& itemsFound, const Rectangle<int>& area)
    {
        for (int i = getComponentHolder()->getNumChildComponents(); --i >= 0;)
        {
            Component* c = getComponentHolder()->getChildComponent(i);
            if (c->getBounds().intersects (area))
                itemsFound.add (ComponentDocument::getJucerIDFor (c));
        }
    }

    //==============================================================================
    class DragOperation  : public EditorDragOperation
    {
    public:
        DragOperation (ComponentEditorCanvas* canvas_,
                       const MouseEvent& e, const Point<int>& mousePos,
                       Component* snapGuideParentComp_,
                       const ResizableBorderComponent::Zone& zone_)
            : EditorDragOperation (canvas_, e, mousePos, snapGuideParentComp_, zone_)
        {
        }

        ~DragOperation()
        {
            getUndoManager().beginNewTransaction();
        }

    protected:
        ComponentDocument& getDocument() throw()                { return static_cast <ComponentEditorCanvas*> (canvas)->getDocument(); }

        void getSnapPointsX (Array<float>& points, bool includeCentre)
        {
            const float width = getDocument().getCanvasWidth().getValue();
            points.add (0.0f);
            points.add (width);

            if (includeCentre)
                points.add (width / 2.0f);
        }

        void getSnapPointsY (Array<float>& points, bool includeCentre)
        {
            const float height = getDocument().getCanvasHeight().getValue();
            points.add (0.0f);
            points.add (height);

            if (includeCentre)
                points.add (height / 2.0f);
        }

        int getCanvasWidth()                                    { return getDocument().getCanvasWidth().getValue(); }
        int getCanvasHeight()                                   { return getDocument().getCanvasHeight().getValue(); }

        UndoManager& getUndoManager()                           { return *getDocument().getUndoManager(); }

        void getObjectDependencies (const ValueTree& state, Array<ValueTree>& deps)
        {
            ComponentDocument& doc = getDocument();
            RelativeRectangle pr (doc.getCoordsFor (state));

            StringArray anchors;
            anchors.addIfNotAlreadyThere (pr.left.getAnchorName1());
            anchors.addIfNotAlreadyThere (pr.left.getAnchorName2());
            anchors.addIfNotAlreadyThere (pr.top.getAnchorName1());
            anchors.addIfNotAlreadyThere (pr.top.getAnchorName2());
            anchors.addIfNotAlreadyThere (pr.right.getAnchorName1());
            anchors.addIfNotAlreadyThere (pr.right.getAnchorName2());
            anchors.addIfNotAlreadyThere (pr.bottom.getAnchorName1());
            anchors.addIfNotAlreadyThere (pr.bottom.getAnchorName2());

            for (int i = 0; i < anchors.size(); ++i)
            {
                const String anchor (anchors[i]);
                if (anchor.isNotEmpty() && ! anchor.startsWith ("parent."))
                {
                    const ValueTree v (doc.getComponentWithMemberName (anchor.upToFirstOccurrenceOf (".", false, false)));

                    if (v.isValid())
                        deps.add (v);
                }
            }
        }

        const Rectangle<float> getObjectPosition (const ValueTree& state)
        {
            ComponentDocument& doc = getDocument();
            return doc.getCoordsFor (state).resolve (&doc);
        }

        void setObjectPosition (ValueTree& state, const Rectangle<float>& newBounds)
        {
            ComponentDocument& doc = getDocument();
            RelativeRectangle pr (doc.getCoordsFor (state));
            pr.moveToAbsolute (newBounds, &doc);

            doc.setCoordsFor (state, pr);
        }

        float getMarkerPosition (const ValueTree& marker, bool isX)
        {
            ComponentDocument& doc = getDocument();
            return (float) doc.getMarkerList (isX).getCoordinate (marker).resolve (&doc);
        }
    };

    DragOperation* createDragOperation (const MouseEvent& e, Component* snapGuideParentComponent,
                                        const ResizableBorderComponent::Zone& zone)
    {
        DragOperation* d = new DragOperation (this, e, e.getPosition() - origin, snapGuideParentComponent, zone);

        Array<ValueTree> selected, unselected;

        for (int i = getDocument().getNumComponents(); --i >= 0;)
        {
            const ValueTree v (getDocument().getComponent (i));
            if (editor.getSelection().isSelected (v [ComponentDocument::idProperty]))
                selected.add (v);
            else
                unselected.add (v);
        }

        d->initialise (selected, unselected);
        return d;
    }

    UndoManager& getUndoManager()
    {
        return *getDocument().getUndoManager();
    }

private:
    //==============================================================================
    ComponentEditor& editor;

    class ComponentHolder   : public Component,
                              public Value::Listener
    {
    public:
        ComponentHolder (const Value& backgroundColour_)
            : backgroundColour (backgroundColour_)
        {
            setOpaque (true);
            updateColour();
            backgroundColour.addListener (this);
        }

        ~ComponentHolder()
        {
            deleteAllChildren();
        }

        void updateColour()
        {
            Colour newColour (Colours::white);

            if (backgroundColour.toString().isNotEmpty())
                newColour = Colour::fromString (backgroundColour.toString());

            if (newColour != colour)
            {
                colour = newColour;
                repaint();
            }
        }

        void paint (Graphics& g)
        {
            if (colour.isOpaque())
                g.fillAll (colour);
            else
                g.fillCheckerBoard (0, 0, getWidth(), getHeight(), 24, 24,
                                    Colour (0xffeeeeee).overlaidWith (colour),
                                    Colour (0xffffffff).overlaidWith (colour));
        }

        void valueChanged (Value&)
        {
            updateColour();
        }

    private:
        Value backgroundColour;
        Colour colour;
    };
};


#endif  // __JUCER_COMPONENTEDITORCANVAS_H_37C33B56__