qgslegendgroup.cpp

一个非常好的GIS开源新版本

/***************************************************************************
 *   Copyright (C) 2005 by Tim Sutton   *
 *   aps02ts@macbuntu   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include "qgsapplication.h"
#include "qgslegendgroup.h"
#include "qgslegendlayer.h"
#include "qgslegendlayerfile.h"
#include <QCoreApplication>
#include <QIcon>

QgsLegendGroup::QgsLegendGroup(QTreeWidgetItem * theItem ,QString theName)
    : QgsLegendItem(theItem,theName)
{
  mType=LEGEND_GROUP;
  setFlags(Qt::ItemIsEditable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
  setCheckState (0, Qt::Checked);
  QIcon myIcon(QgsApplication::themePath()+"/mActionFolder.png");
  setIcon(0, myIcon);
}
QgsLegendGroup::QgsLegendGroup(QTreeWidget* theListView, QString theString)
    : QgsLegendItem(theListView,theString)
{
  mType=LEGEND_GROUP;
  setFlags(Qt::ItemIsEditable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
  setCheckState (0, Qt::Checked);
  QIcon myIcon(QgsApplication::themePath()+"/mActionFolder.png");
  setIcon(0, myIcon);
}

QgsLegendGroup::QgsLegendGroup(QString name): QgsLegendItem()
{
  mType=LEGEND_GROUP;
  setFlags(Qt::ItemIsEditable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
  setCheckState (0, Qt::Checked);
  QIcon myIcon(QgsApplication::themePath()+"/mActionFolder.png");
  setText(0, name);
  setIcon(0, myIcon);
}

QgsLegendGroup::~QgsLegendGroup()
{}


bool QgsLegendGroup::isLeafNode()
{
  return mLeafNodeFlag;
}

QgsLegendItem::DRAG_ACTION QgsLegendGroup::accept(LEGEND_ITEM_TYPE type)
{
    if ( type == LEGEND_GROUP )
    {
	return REORDER;
    }
    if( type == LEGEND_LAYER )
    {
	return INSERT;
    }
    else
    {
	return NO_ACTION;
    }
}

QgsLegendItem::DRAG_ACTION QgsLegendGroup::accept(const QgsLegendItem* li) const
{
  if(li)
    {
      LEGEND_ITEM_TYPE type = li->type();
      if ( type == LEGEND_GROUP )
	{
	  return REORDER;
	}
      if( type == LEGEND_LAYER )
	{
	  return INSERT;
	}
    }
  return NO_ACTION;
}

bool QgsLegendGroup::insert(QgsLegendItem* theItem)
{
    if(theItem->type() == LEGEND_LAYER)
    {
        addChild(theItem);
    }
    // XXX - mloskot - I don't know what to return
    // but this function must return a value
    return true;
}

std::list<QgsLegendLayerFile*> QgsLegendGroup::legendLayerFiles()
{
  std::list<QgsLegendLayerFile*> result;
  for(int i = 0; i < childCount(); ++i)
    {
      QgsLegendLayer* childItem = dynamic_cast<QgsLegendLayer*>(child(i));
      if(childItem)
	{
	  std::list<QgsLegendLayerFile*> childList = childItem->legendLayerFiles();
	  result.splice(result.end(), childList);
	}
    }
  return result;
}

void QgsLegendGroup::updateCheckState()
{
  std::list<QgsLegendLayerFile*> llfiles = legendLayerFiles();
  if(llfiles.size() < 1)
    {
      return;
    }

  std::list<QgsLegendLayerFile*>::iterator iter = llfiles.begin();
  Qt::CheckState theState = (*iter)->checkState(0);
  for(; iter != llfiles.end(); ++iter)
    {
      if(theState != (*iter)->checkState(0))
	{
	  theState = Qt::PartiallyChecked;
	  break;
	}
    }

  if(theState != checkState(0))
    {
      treeWidget()->blockSignals(true);
      setCheckState(0, theState);
      treeWidget()->blockSignals(false);
    }
}