/*
 * WorkflowGraphicsView.cpp
 *
 *  Created on: 2011-9-13
 *      Author: dev
 */

#include <QResizeEvent>
#include <QGraphicsScene>
#include <QGraphicsItem>
#include <QDebug>
#include <QScrollBar>
#include "WorkflowGraphicsView.h"
#include "GeneralWorkflowScene.h"
#include "ModuleGraphicsItem.h"
#include "PaiGeoObject.h"
#include "ConsoleGUIService.h"
#include "ModuleInformation.h"
#include "ModuleParameterUtil.h"

using namespace pai;
using namespace pai::graphics2d;
using namespace pai::objectmodel;

WorkflowGraphicsView::WorkflowGraphicsView(QGraphicsScene *pScene, QWidget *pParent)
:QGraphicsView(pScene,pParent), m_pEnsureVisibleItem(NULL)
{
	// TODO Auto-generated constructor stub
	setAlignment(Qt::AlignTop | Qt::AlignLeft);
	setDragMode(QGraphicsView::RubberBandDrag);
	setAcceptDrops(true);
	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
	setResizeAnchor(QGraphicsView::NoAnchor);
	connect(&pai::graphics2d::ModuleGraphicsItem::m_EventAgent,SIGNAL(ModuleCenterOn(QGraphicsItem*)),this,SLOT(slotItemNeedCenterOn(QGraphicsItem*)));
	viewport()->setProperty("UsePaiStyleRubberBand", true);
	m_SceneReadOnly = false;

}

WorkflowGraphicsView::~WorkflowGraphicsView()
{
	// TODO Auto-generated destructor stub
}

void WorkflowGraphicsView::SetScenceReadOnly(bool readonly)
{
    m_SceneReadOnly = readonly;
    QGraphicsScene *pScene = scene();
    if (pScene)
    {
        pai::graphics2d::GeneralWorkflowScene *pWorkflowSceneManager = dynamic_cast<pai::graphics2d::GeneralWorkflowScene *>(pScene);
        if (pWorkflowSceneManager)
            pWorkflowSceneManager->SetScenceReadOnly(m_SceneReadOnly);
    }
}

void WorkflowGraphicsView::contextMenuEvent(QContextMenuEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::contextMenuEvent(event);
    }
}

void WorkflowGraphicsView::dropEvent(QDropEvent *event)
{
	if (m_SceneReadOnly)
	{
		return;
	}

	QGraphicsView::dropEvent(event);
}

void WorkflowGraphicsView::dragEnterEvent(QDragEnterEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::dragEnterEvent(event);
    }
}

void WorkflowGraphicsView::dragLeaveEvent(QDragLeaveEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::dragLeaveEvent(event);
    }
}

void WorkflowGraphicsView::dragMoveEvent(QDragMoveEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::dragMoveEvent(event);
    }
}

void WorkflowGraphicsView::keyPressEvent(QKeyEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::keyPressEvent(event);
    }
}

void WorkflowGraphicsView::keyReleaseEvent(QKeyEvent *event)
{
    if (!m_SceneReadOnly)
    {
        QGraphicsView::keyReleaseEvent(event);
    }
}

void WorkflowGraphicsView::mousePressEvent ( QMouseEvent * event )
{
	if (event->buttons() != Qt::LeftButton)
		return;
	QGraphicsView::mousePressEvent(event);
}

void WorkflowGraphicsView::mouseReleaseEvent ( QMouseEvent * event )
{
	QGraphicsView::mouseReleaseEvent(event);

	if (m_pEnsureVisibleItem)
	{
		ensureVisible(m_pEnsureVisibleItem);
		m_pEnsureVisibleItem = NULL;
	}
}

void WorkflowGraphicsView::mouseMoveEvent ( QMouseEvent * event )
{
	QGraphicsView::mouseMoveEvent(event);

	if (event->buttons() != Qt::LeftButton)
		return;

	QScrollBar *scrollBar;

	int auxX = event->x();
	int auxY = event->y();
	int posMaxX = viewport()->width() -1;
	int posMaxY = viewport()->height() -1;

	if (auxX <= 0)
	{
		scrollBar = horizontalScrollBar();
		scrollBar->setValue(scrollBar->value() - scrollBar->singleStep());
	}
	else if (auxX >= posMaxX)
	{
		scrollBar = horizontalScrollBar();
		scrollBar->setValue(scrollBar->value() + scrollBar->singleStep());
	}

	if (auxY <= 0)
	{
		scrollBar = verticalScrollBar();
		scrollBar->setValue(scrollBar->value() - scrollBar->singleStep());
	}
	else if (auxY >= posMaxY)
	{
		scrollBar = verticalScrollBar();
		scrollBar->setValue(scrollBar->value() + scrollBar->singleStep());
	}
}

void WorkflowGraphicsView::focusInEvent(QFocusEvent * focusEvent)
{
    QGraphicsView::focusInEvent(focusEvent);
}

QRectF WorkflowGraphicsView::CalculateAdaptiveSceneRect()
{
	QList<QGraphicsItem*> lstItems=items();
	if(lstItems.count()>0)
	{
		QGraphicsItem* pMostRightItem=lstItems.at(0);
		QGraphicsItem* pMostBottomItem=lstItems.at(0);
		foreach(QGraphicsItem* pItem,lstItems)
		{
			if(pItem->pos().x()>pMostRightItem->pos().x())
			{
				pMostRightItem=pItem;
			}
			if(pItem->pos().y()>pMostBottomItem->pos().y())
			{
				pMostBottomItem=pItem;
			}
		}
		return QRectF(0,0,pMostRightItem->pos().x()+pMostRightItem->boundingRect().width(),pMostBottomItem->pos().y()+pMostBottomItem->boundingRect().height());
	}
	return QRectF();

}

void WorkflowGraphicsView::slotItemNeedCenterOn(QGraphicsItem* pItem)
{
    // catch the item on current scene only
    if (pItem->scene() == scene())
    {
        m_pEnsureVisibleItem = pItem;
    }
}