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#include <QtGui>

#include "diagramtextitem.h"
#include "diagramscene.h"

DiagramTextItem::DiagramTextItem(
                    QGraphicsItem *parent, QGraphicsScene *scene,
                    bool editable, int styleIO,
                    unsigned char ID, QString defaultText, QPointF offset)
    : QGraphicsTextItem(parent, scene)
{
    myOwnerScene=scene;
    myStyleIO = styleIO;
    myID=ID;
    editableItem=editable;
    setPlainText(defaultText);
    posOffset=offset;

    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
    setFlag(QGraphicsItem::ItemSendsScenePositionChanges, true);

    if(myStyleIO==0xFFF)
        setFlag(QGraphicsItem::ItemIsMovable,false);
    else
        setFlag(QGraphicsItem::ItemIsMovable,true);

    setFlag(QGraphicsItem::ItemIsSelectable,true);
    editorOpened=0;

    updatePosition();
}

void DiagramTextItem::updatePosition()
{
        if(myStyleIO>255)
            setPos(posOffset+QPointF(-boundingRect().width()/2,
                                                -boundingRect().height()/2));
        else if(myStyleIO & 0b10000000)
            setPos(posOffset+QPointF(0,-boundingRect().height()/2));
        else                                //OUT
            setPos(posOffset+QPointF(-boundingRect().width(),
                                                -boundingRect().height()/2));
}

QVariant DiagramTextItem::itemChange(GraphicsItemChange change,
                     const QVariant &value)
{
    return value;
}

void DiagramTextItem::focusOutEvent(QFocusEvent *event)
{
    setPlainText(toPlainText().trimmed());
    if(toPlainText()=="") setPlainText("?");    
    setTextInteractionFlags(Qt::NoTextInteraction);

    if(myStyleIO!=0xFFF)
        setFlag(QGraphicsItem::ItemIsMovable,true);

    QTextCursor cursor = textCursor();
    cursor.clearSelection();
    setTextCursor(cursor);
    QGraphicsTextItem::focusOutEvent(event);
    editorOpened=0;

    updatePosition();
}

void DiagramTextItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    if(editableItem)
    {        
        if (textInteractionFlags() == Qt::NoTextInteraction)
            setTextInteractionFlags(Qt::TextEditorInteraction);
        setSelected(1);
        setFocus(Qt::MouseFocusReason);
        setFlag(QGraphicsItem::ItemIsMovable,false);
        editorOpened=1;
    }
    QGraphicsTextItem::mouseDoubleClickEvent(event);
}

void DiagramTextItem::snapToGrid(QGraphicsSceneMouseEvent *event)
{
    if(myStyleIO!=0xFFF)
        setOffset(event->scenePos());    
}

void DiagramTextItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    if(editorOpened==0)
    {
        printf("StyleIO:[%x]",myStyleIO); fflush(stdout);
        snapToGrid(event);
        QGraphicsTextItem::mousePressEvent(event);
    }
}

void DiagramTextItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    if(editorOpened==0 && myStyleIO!=0xFFF)
    {
        snapToGrid(event);
        QGraphicsTextItem::mouseReleaseEvent(event);        
    }
}

void DiagramTextItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    if(editorOpened==0 && myStyleIO!=0xFFF)
    {
        snapToGrid(event);        
        QGraphicsTextItem::mouseMoveEvent(event);
        updatePosition();
    }
}

QDomElement  DiagramTextItem::toXml(QDomDocument &document) const
{
        QDomElement textItem = document.createElement("TextItem");
        textItem.setAttribute("text",toPlainText());
        if(myStyleIO<256)
        {
            textItem.setAttribute("myStyleIO",myStyleIO);
            textItem.setAttribute("editableItem",0);
        }
        else if (myStyleIO==256)
        {
            textItem.setAttribute("myStyleIO",0);
            textItem.setAttribute("editableItem",0);
        }
        else if (myStyleIO==257)
        {
            textItem.setAttribute("myStyleIO",0);
            textItem.setAttribute("editableItem",1);
        }
        textItem.setAttribute("posOffset-x",
                              QPointF(posOffset-QPointF(500,500)).x());
        textItem.setAttribute("posOffset-y",
                              -QPointF(posOffset-QPointF(500,500)).y());
        return (textItem);
}