#include "stdafx.h"
#include "MapToolPan.h"
#include "ImageViewer.h"
#include <QMouseEvent>
#include <QGraphicsView>

MapToolPan::MapToolPan(QObject* parent)
    : MapTool(parent)
{
    setCursor(Qt::OpenHandCursor);
}

MapToolPan::~MapToolPan()
{
}

void MapToolPan::activate()
{
    MapTool::activate();
    if (canvas())
    {
        canvas()->setDragMode(QGraphicsView::NoDrag);
    }
}

void MapToolPan::deactivate()
{
    m_dragging = false;
    MapTool::deactivate();
}

void MapToolPan::canvasMousePressEvent(QMouseEvent* e)
{
    if (e->button() == Qt::LeftButton)
    {
        m_dragging = true;
        m_lastPos = e->pos();
        if (canvas())
        {
            canvas()->viewport()->setCursor(Qt::ClosedHandCursor);
        }
    }
}

void MapToolPan::canvasMouseMoveEvent(QMouseEvent* e)
{
    if (m_dragging && canvas())
    {
        QPointF delta = canvas()->mapToScene(e->pos()) - canvas()->mapToScene(m_lastPos);
        canvas()->translate(delta.x(), delta.y());
        m_lastPos = e->pos();
    }
}

void MapToolPan::canvasMouseReleaseEvent(QMouseEvent* e)
{
    if (e->button() == Qt::LeftButton)
    {
        m_dragging = false;
        if (canvas())
        {
            canvas()->viewport()->setCursor(Qt::OpenHandCursor);
        }
    }
}