qgslegendlayer.h

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.             *
 ***************************************************************************/
#ifndef QGSLEGENDLAYER_H
#define QGSLEGENDLAYER_H

//#include <qobject.h>
#include <qgslegenditem.h>
#include <QFileInfo>

class QgsLegendLayer;
class QgsLegendLayerFile;
class QgsLegendPropertyGroup;
class QgsMapLayer;
class QgsRasterLayer;
class QgsVectorLayer;

class QTreeWidget;

typedef std::list< std::pair<QString, QPixmap> > SymbologyList;

/**
Container for layer, including layer file(s), symbology class breaks and properties

@author Tim Sutton
*/
class QgsLegendLayer : public QgsLegendItem
{
    Q_OBJECT
  
public:
    QgsLegendLayer(QTreeWidgetItem * ,QString);
    QgsLegendLayer(QTreeWidget* ,QString);
    QgsLegendLayer(QString name);
    ~QgsLegendLayer();
    /**Sets an icon characterising the type of layer(s) it contains.
     Note: cannot be in the constructor because layers are added after creation*/
    void setLayerTypeIcon();
    bool isLeafNode();
    QgsLegendItem::DRAG_ACTION accept(LEGEND_ITEM_TYPE type);
    QgsLegendItem::DRAG_ACTION accept(const QgsLegendItem* li) const;
    /**Returns the map layer associated with the first QgsLegendLayerFile or 0 if
     there is no QgsLegendLayerFile*/
    QgsMapLayer* firstMapLayer() const;
    /**Returns first map layer's file or 0 if there's no QgsLegendLayerFile */
    QgsLegendLayerFile* firstLayerFile() const;
    /**Returns the map layers associated with the QgsLegendLayerFiles*/
    std::list<QgsMapLayer*> mapLayers();
    /**Returns the legend layer file items associated with this legend layer*/
    std::list<QgsLegendLayerFile*> legendLayerFiles();
    /**Goes through all the legendlayerfiles and sets check state to checked/partially checked/unchecked*/
    void updateCheckState();

    /**Updates symbology of the layer and copies symbology to other layer files in the group*/
    void refreshSymbology(const QString& key);

    /**Goes through all the legendlayerfiles and adds editing/overview pixmaps to the icon. If not all layer files
    have the same editing/overview state, a tristate is applied*/
    void updateIcon();
  
    /** called to add appropriate menu items to legend's popup menu */
    void addToPopupMenu(QMenu& theMenu, QAction* toggleEditingAction);
    
    /**Determines whether there are layers in overview*/
    bool isInOverview();
    
  public slots:
    
    /**Toggle show in overview*/
    void showInOverview();
  
    /**Show layer attribute table*/
    void table();
    
    void saveAsShapefile();
    void saveSelectionAsShapefile();
    
  protected:
    
    /** Prepare and change symbology for vector layer */
    void vectorLayerSymbology(const QgsVectorLayer* mapLayer);
    
    /** Prepare and change symbology for raster layer */
    void rasterLayerSymbology(QgsRasterLayer* mapLayer);
    
    /** Removes the symbology items of a layer and adds new ones.
     * If other files are in the same legend layer, the new symbology settings are copied.
     * Note: the QIcon* are deleted and therefore need to be allocated by calling
     * functions using operator new
     */
    void changeSymbologySettings(const QgsMapLayer* mapLayer, const SymbologyList& newSymbologyItems);
    
    /** Copies the symbology settings of the layer to all maplayers in the QgsLegendLayerFileGroup.
     * This method should be called whenever a layer in this group changes it symbology settings
     */
    void updateLayerSymbologySettings(const QgsMapLayer* mapLayer);

    QPixmap getOriginalPixmap() const;
};

#endif