MapItem.cpp

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

    This file is part of the TerraLib - a Framework for building GIS enabled applications.

    TerraLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License,
    or (at your option) any later version.

    TerraLib 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file MapItem.cpp
   
  \brief 

  \ingroup layout
*/

// TerraLib
#include "MapItem.h"
#include "../../core/pattern/singleton/Context.h"
#include "../../core/AbstractScene.h"
#include "../../core/pattern/mvc/ItemModelObservable.h"
#include "../../core/pattern/mvc/ItemObserver.h"
#include "../../core/pattern/mvc/ItemController.h"
#include "../../../color/RGBAColor.h"
#include "../../../qt/widgets/Utils.h"
#include "../../../geometry/Envelope.h"
#include "../../../common/STLUtils.h"
#include "../../../qt/widgets/canvas/Canvas.h"
#include "../../../dataaccess/utils/Utils.h"
#include "../../../dataaccess/dataset/ObjectIdSet.h"
#include "../../../qt/widgets/canvas/MultiThreadMapDisplay.h"
#include "../../../common/TreeItem.h"
#include "../../../srs/Converter.h"
#include "../../../maptools/Utils.h"
#include "../../item/MapController.h"
#include "../../../qt/widgets/tools/Pan.h"
#include "../../../qt/widgets/tools/ZoomArea.h"
#include "../../../qt/widgets/tools/ZoomClick.h"
#include "../core/ItemUtils.h"
#include "../../item/MapModel.h"
#include "../../../common/StringUtils.h"
#include "../../core/enum/Enums.h"
#include "../core/Scene.h"
#include "../../core/pattern/proxy/AbstractProxyProject.h"

// STL
#include <vector>
#include <memory>

// Qt
#include <QCursor>
#include <QPixmap>
#include <QMessageBox>
#include <QWidget>
#include <QDropEvent>
#include <QBoxLayout>
#include <QGroupBox>
#include <QVBoxLayout>
#include <QLabel>
#include <QPointer>
#include <QDebug>
#include <QApplication>
#include <QGraphicsSceneMouseEvent>
#include <QStyleOptionGraphicsItem>
#include <QEvent>
#include <QPoint>
#include <QMimeData>
#include <QColor>

#include <QTextEdit>

te::layout::MapItem::MapItem( ItemController* controller, Observable* o ) :
  ParentItem<QGraphicsProxyWidget>(controller, o),
  m_mapDisplay(0),
  m_grabbedByWidget(false),
  m_treeItem(0),
  m_tool(0),
  m_wMargin(0),
  m_hMargin(0),
  m_layer(0),
  m_changeLayer(false)
{    
  m_nameClass = std::string(this->metaObject()->className());
  
  Utils* utils = Context::getInstance().getUtils();
  te::gm::Envelope box;
  
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  if(model)
  {
    box = utils->viewportBox(model->getMapBox());
  }
  else
  {
    box = utils->viewportBox(m_model->getBox());
  }

  m_mapSize = QSize(box.getWidth(), box.getHeight());
  m_mapDisplay = new te::qt::widgets::MultiThreadMapDisplay(m_mapSize, true);
  m_mapDisplay->setSynchronous(true);
  m_mapDisplay->setAcceptDrops(true);
  m_mapDisplay->setBackgroundColor(Qt::gray);
  m_mapDisplay->setResizeInterval(0);
  m_mapDisplay->setMouseTracking(true);

  connect(m_mapDisplay,SIGNAL(drawLayersFinished(const QMap<QString, QString>&)),
    this,SLOT(onDrawLayersFinished(const QMap<QString, QString>&)));

  m_zoomWheel = new te::qt::widgets::ZoomWheel(m_mapDisplay);
  m_mapDisplay->installEventFilter(m_zoomWheel);

  setWidget(m_mapDisplay);
    
  calculateFrameMargin();

  setWindowFrameMargins(m_wMargin, m_hMargin, m_wMargin, m_hMargin);

  m_mapDisplay->show();

  /*
    MapItem will handle all the events. 
    For example, the event of mouse click on the child item 
    won't be handled by child item.
  */
  setHandlesChildEvents(true);
}

te::layout::MapItem::~MapItem()
{
  clearCurrentTool();
  if(m_zoomWheel)
  {
    m_mapDisplay->removeEventFilter(m_zoomWheel);
    delete m_zoomWheel;
    m_zoomWheel = 0;
  }
}

void te::layout::MapItem::updateObserver( ContextItem context )
{
  if(!m_model)
    return;

  Utils* utils = context.getUtils();

  if(!utils)
    return;

  QRectF boundRect;
  boundRect = boundingRect();

  te::gm::Envelope box = utils->viewportBox(m_model->getBox());
  
  if(!box.isValid())
    return;
  
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  if(model)
  {
    double zoomFactor = Context::getInstance().getZoomFactor();

    te::gm::Envelope mapBox = utils->viewportBox(model->getMapBox());
    double w = mapBox.getWidth() * zoomFactor;
    double h = mapBox.getHeight() * zoomFactor;

    /* This item ignores the transformations of the scene, so comes with no zoom. 
    His transformation matrix is the inverse scene, understanding the pixel 
    coordinates, and its position can only be given in the scene coordinates(mm). 
    For these reasons, it is necessary to resize it.*/
    if(w != m_mapDisplay->getWidth() 
      || h != m_mapDisplay->getHeight())
    {
      QPointF pt = scenePos();
      m_mapDisplay->setGeometry(pt.x(), pt.y(), w, h);
    }

    te::color::RGBAColor clr = model->getMapBackgroundColor();
    QColor qcolor;
    qcolor.setRed(clr.getRed());
    qcolor.setGreen(clr.getGreen());
    qcolor.setBlue(clr.getBlue());
    qcolor.setAlpha(clr.getAlpha());
    m_mapDisplay->setBackgroundColor(qcolor);
    m_mapDisplay->refresh();

    calculateFrameMargin();
  }

  te::color::RGBAColor** rgba = context.getPixmap();

  if(!rgba)
    return;

  QPixmap pixmap;
  QImage* img = 0;

  if(rgba)
  {
    img = te::qt::widgets::GetImage(rgba, box.getWidth(), box.getHeight());
    pixmap = QPixmap::fromImage(*img);
  }
    
  te::common::Free(rgba, box.getHeight());
  if(img)
    delete img;
  
  setPixmap(pixmap);
  update();
}

QPointF remapPointToViewport(const QPointF& point, const QRectF& item, const QRectF& widget)
{
  double resX = widget.width() / item.width();
  double resY = widget.height() / item.height();

  QMatrix matrix;
  matrix.scale(resX, -resY);
  matrix.translate(-item.bottomLeft().x(), -item.bottomLeft().y());

  QPointF remappedPoint = matrix.map(point);
  return remappedPoint;
}

void te::layout::MapItem::paint( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget /*= 0 */ )
{  
  Q_UNUSED( option );
  Q_UNUSED( widget );
  if ( !painter )
  {
    return;
  }
  
  drawBackground( painter );

  drawMap(painter);

  drawBorder(painter);

  //Draw Selection
  if (option->state & QStyle::State_Selected)
  {
    drawSelection(painter);
  }
}

void te::layout::MapItem::drawMap( QPainter * painter )
{
  if(!m_mapDisplay || !painter)
    return;

  QRectF boundRect;
  boundRect = boundingRect();

  if( m_pixmap.isNull() || m_changeLayer)
  {
    m_changeLayer = false;
        
    m_pixmap = QPixmap(m_mapDisplay->width(), m_mapDisplay->height());
    m_pixmap.fill(Qt::transparent);

    QPainter localPainter(&m_pixmap);
    m_mapDisplay->render(&localPainter);
    localPainter.end();

    QImage image = m_pixmap.toImage();
    image = image.mirrored();

    m_pixmap = QPixmap::fromImage(image);
  }

  painter->save();
  painter->setClipRect(boundRect);
  painter->drawPixmap(boundRect, m_pixmap, m_pixmap.rect());
  
  painter->restore();
}

void te::layout::MapItem::dropEvent( QGraphicsSceneDragDropEvent * event )
{
  //Copy the map from layer tree
  Qt::DropActions actions = event->dropAction();
  if(actions != Qt::CopyAction)
    return;

  getMimeData(event->mimeData());

  te::map::AbstractLayerPtr al = m_treeItem->getLayer();
  te::gm::Envelope e = al->getExtent();

  std::list<te::map::AbstractLayerPtr> layerList;
  layerList.push_back(al);

  m_layer = al;

  m_mapDisplay->setLayerList(layerList);
  m_mapDisplay->setSRID(al->getSRID(), false);
  m_mapDisplay->setExtent(e, true);
}

void te::layout::MapItem::dragEnterEvent( QGraphicsSceneDragDropEvent * event )
{
  //Copy the map from layer tree
  Qt::DropActions actions = event->dropAction();
  if(actions != Qt::CopyAction)
    return;

  const QMimeData* mime = event->mimeData();
  QString s = mime->data("application/x-terralib;value=\"DraggedItems\"").constData();
  if(s.isEmpty())
    return;

  event->acceptProposedAction();
}

void te::layout::MapItem::dragLeaveEvent( QGraphicsSceneDragDropEvent * event )
{
}

void te::layout::MapItem::dragMoveEvent( QGraphicsSceneDragDropEvent * event )
{

}

void te::layout::MapItem::setPixmap( const QPixmap& pixmap )
{
  m_pixmap = pixmap;
}

te::gm::Coord2D te::layout::MapItem::getPosition()
{
  /* Correctly position the object and change the origin for bottomLeft */
  double x = 0;
  double y = 0;
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  te::gm::Envelope box;
  if(model)
  {
    box = model->getMapBox();
    x = model->getDisplacementX() * 2;
    y = model->getDisplacementY() * 2;
  }
  else
  {
    box = m_model->getBox();
  }

  QPointF posF = scenePos();

  qreal valuex = posF.x() - x;
  qreal valuey = posF.y() - y;

  te::gm::Coord2D coordinate;
  coordinate.x = valuex;
  coordinate.y = valuey;

  return coordinate;
}

void te::layout::MapItem::mouseMoveEvent( QGraphicsSceneMouseEvent * event )
{
  ItemUtils* iUtils = Context::getInstance().getItemUtils();
  if(!iUtils)
    return;

  if(!iUtils->isCurrentMapTools())
  {
    clearCurrentTool();
    ParentItem::mouseMoveEvent(event);
  }
  else
  {
    QRectF rect = boundingRect();
    QPointF point = event->pos();
    QPointF remappedPoint = remapPointToViewport(point, rect, m_mapDisplay->rect());

    QMouseEvent mouseEvent(QEvent::MouseMove, remappedPoint.toPoint(),
    event->button(),event->buttons(), event->modifiers());
    QApplication::sendEvent(m_mapDisplay, &mouseEvent);
    event->setAccepted(mouseEvent.isAccepted());

    this->update();
  }
}

void te::layout::MapItem::mousePressEvent( QGraphicsSceneMouseEvent * event )
{
  ItemUtils* iUtils = Context::getInstance().getItemUtils();
  if(!iUtils)
    return;

  if(!iUtils->isCurrentMapTools())
  {
    clearCurrentTool();
    ParentItem::mousePressEvent(event);
  }
  else
  {
    QRectF rect = boundingRect();
    QPointF point = event->pos();
    QPointF remappedPoint = remapPointToViewport(point, rect, m_mapDisplay->rect());

    QMouseEvent mouseEvent(QEvent::MouseButtonPress, remappedPoint.toPoint(),
    event->button(),event->buttons(), event->modifiers());
    QApplication::sendEvent(m_mapDisplay, &mouseEvent);
    event->setAccepted(mouseEvent.isAccepted());

    this->update();
  }
}

void te::layout::MapItem::mouseReleaseEvent( QGraphicsSceneMouseEvent * event )
{
  ItemUtils* iUtils = Context::getInstance().getItemUtils();
  if(!iUtils)
    return;

  if(!iUtils->isCurrentMapTools())
  {
    clearCurrentTool();
    ParentItem::mouseReleaseEvent(event); 
  }
  else
  {
    QRectF rect = boundingRect();
    QPointF point = event->pos();
    QPointF remappedPoint = remapPointToViewport(point, rect, m_mapDisplay->rect());

    QMouseEvent mouseEvent(QEvent::MouseButtonRelease, remappedPoint.toPoint(),
    event->button(),event->buttons(), event->modifiers());
    QApplication::sendEvent(m_mapDisplay, &mouseEvent);
    event->setAccepted(mouseEvent.isAccepted());

    this->update();
  }
  refresh();
}

void te::layout::MapItem::getMimeData( const QMimeData* mime )
{
  QString s = mime->data("application/x-terralib;value=\"DraggedItems\"").constData();
  unsigned long v = s.toULongLong();
  std::vector<te::qt::widgets::AbstractTreeItem*>* draggedItems = reinterpret_cast<std::vector<te::qt::widgets::AbstractTreeItem*>*>(v);

  if(draggedItems->empty())
    return;

  m_treeItem = draggedItems->operator[](0);  
}

std::list<te::map::AbstractLayerPtr> te::layout::MapItem::getVisibleLayers()
{
  std::list<te::map::AbstractLayerPtr> visibleLayers;

  if(!m_treeItem)
    return visibleLayers;

  te::map::AbstractLayerPtr al = m_treeItem->getLayer();

  if(al.get() == 0)
    return visibleLayers;

  std::list<te::map::AbstractLayerPtr> vis;
  te::map::GetVisibleLayers(al, vis);
  // remove folders
  std::list<te::map::AbstractLayerPtr>::iterator vit;
  for(vit = vis.begin(); vit != vis.end(); ++vit)
  {
    if((*vit)->getType() == "DATASETLAYER" || 
      (*vit)->getType() == "QUERYLAYER" ||
      (*vit)->getType() == "RASTERLAYER")
    {
      visibleLayers.push_front(*vit);
    }
  }

  return visibleLayers;
}

te::map::AbstractLayerPtr te::layout::MapItem::getLayer()
{
  te::map::AbstractLayerPtr layer;

  if(!m_treeItem)
    return layer;

  layer = m_treeItem->getLayer();

  return layer;
}

void te::layout::MapItem::onDrawLayersFinished( const QMap<QString, QString>& errors )
{
  if(!errors.empty())
    return;

  te::map::AbstractLayerPtr layer = getLayer();

  if(!m_controller)
    return;

  MapController* controller = dynamic_cast<MapController*>(m_controller);
  if(controller)
  {
    bool result = controller->refreshLayer(layer);
    if(result)
    {
      redraw();
    }
  }

  generateMapPixmap();

  m_changeLayer = true;

  update();
}

void te::layout::MapItem::setCurrentTool( te::qt::widgets::AbstractTool* tool )
{
  m_tool = tool;

  m_mapDisplay->installEventFilter(m_tool);
}

void te::layout::MapItem::clearCurrentTool()
{
  if(m_tool)
  {
    m_mapDisplay->removeEventFilter(m_tool);

    delete m_tool;
    m_tool = 0;
  }
}

void te::layout::MapItem::changeCurrentTool( EnumType* mode )
{
  clearCurrentTool();

  EnumModeType* type = Enums::getInstance().getEnumModeType();

  te::layout::Context::getInstance().setMode(mode);
  if(mode == type->getModeMapPan())
  {
    te::qt::widgets::Pan* pan = new te::qt::widgets::Pan(m_mapDisplay, Qt::OpenHandCursor, Qt::ClosedHandCursor);  
    setCurrentTool(pan);
  }
  if(mode == type->getModeMapZoomIn())
  {
    //Zoom In
    std::string icon_path_zoom_area = "layout-map-zoom-in";
    QCursor zoomAreaCursor(QIcon::fromTheme(icon_path_zoom_area.c_str()).pixmap(QSize(10,10)));
    te::qt::widgets::ZoomArea* zoomArea = new te::qt::widgets::ZoomArea(m_mapDisplay, zoomAreaCursor);
    setCurrentTool(zoomArea);
  }
  if(mode == type->getModeMapZoomOut())
  {
    //Zoom Out
    std::string icon_path_zoom_out = "layout-map-zoom-out";
    QCursor zoomOutCursor(QIcon::fromTheme(icon_path_zoom_out.c_str()).pixmap(QSize(10,10)));
    te::qt::widgets::ZoomClick* zoomOut = new te::qt::widgets::ZoomClick(m_mapDisplay, zoomOutCursor, 2.0, te::qt::widgets::Zoom::Out);
    setCurrentTool(zoomOut);
  }
}

te::color::RGBAColor** te::layout::MapItem::getRGBAColorImage(int &w, int &h)
{
  te::color::RGBAColor** teImg = 0;

  QImage img = m_pixmap.toImage();
  img = img.mirrored();

  if(img.isNull())
  {
    return teImg;
  }

  w = img.width();
  h = img.height();

  teImg = te::qt::widgets::GetImage(&img);
  return teImg;
}

QImage te::layout::MapItem::generateImage()
{
  QColor color(0, 0, 255, 0);

  QImage generator(m_pixmap.width(), m_pixmap.height(), QImage::Format_ARGB32);
  generator.fill(color);

  QPainter painter;
  painter.begin(&generator);
  
  QPoint pt(m_wMargin, m_hMargin);
  widget()->render(&painter, pt);

  if(!m_pixmap.isNull())
  {
    QRectF rectF(0, 0, m_pixmap.width(), m_pixmap.height());
    painter.save();
    painter.drawPixmap(rectF, m_pixmap, rectF);
    painter.restore(); 
    generator.mirrored();
  }

  painter.end();
  return generator;
}

void te::layout::MapItem::calculateFrameMargin()
{
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  if(!model)
    return;

  Utils* utils = Context::getInstance().getUtils();

  if(!utils)
    return;

  te::gm::Envelope box = utils->viewportBox(m_model->getBox());
  te::gm::Envelope mapBox = utils->viewportBox(model->getMapBox());

  m_wMargin = (box.getWidth() - mapBox.getWidth()) / 2.;
  m_hMargin = (box.getHeight() - mapBox.getHeight()) / 2.;
}

void te::layout::MapItem::generateMapPixmap()
{
  QRegion srcRegion( 0, 0, this->widget()->width(), this->widget()->height());

  QColor color(255, 255, 255, 0);
  QPixmap img(this->widget()->width(), this->widget()->height());
  img.fill(Qt::transparent);

  QPainter ptr(&img);
  QPoint pt(0, 0);
  this->widget()->render(&ptr, pt, srcRegion);

  m_mapPixmap = img; 
}

void te::layout::MapItem::updateProperties( te::layout::Properties* properties )
{

  MapModel* model = dynamic_cast<MapModel*>(m_model);
  if(!model)
    return;

  if(!m_controller)
    return;

  model->updateProperties(properties);
  redraw();

  if(model->isLoadedLayer())
  {
    redraw();
    return;
  }

  std::string name = model->getNameLayer();

  if(name.compare("") == 0)
    return;

  AbstractProxyProject* project = Context::getInstance().getProxyProject();
  if(!project)
    return;

  te::map::AbstractLayerPtr layer = project->contains(name);
  m_mapDisplay->changeData(layer);

  MapController* controller = dynamic_cast<MapController*>(m_controller);
  if(!controller)
    return;

  bool result = controller->refreshLayer(layer);
  if(result)
  {
    redraw();
  }
}

void te::layout::MapItem::changeZoomFactor( double currentZoomFactor )
{
  QSize currentSize = m_mapDisplay->size();
  QSize newSize = m_mapSize * currentZoomFactor;
  if(currentSize != newSize)
  {
    QPointF pt = scenePos();
    //QWidget::resize(): causes the component return to starting position
    m_mapDisplay->setGeometry(pt.x(), pt.y(), newSize.width(), newSize.height());
    m_changeLayer = true;
  }
}

void te::layout::MapItem::recalculateBoundingRect()
{
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  te::gm::Envelope box = model->getBox();

  if(m_rect.width() != box.getWidth()
    || m_rect.height() != box.getHeight())
  {
    prepareGeometryChange();
    m_rect = QRectF(0., 0., box.getWidth(), box.getHeight()); 

    //update model
    te::gm::Envelope env(m_model->getBox());
    env.m_urx = env.m_llx + m_rect.width();
    env.m_ury = env.m_lly + m_rect.height();
    m_controller->setBox(env);
  }
}

QRectF te::layout::MapItem::boundingRect() const
{
  MapModel* model = dynamic_cast<MapModel*>(m_model);
  te::gm::Envelope box = model->getBox();

  QRectF rect(0., 0., box.getWidth(), box.getHeight()); 
  return rect;
}