qgsmaplayeractionregistry.h

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/***************************************************************************
    qgsmaplayeractionregistry.h
    ---------------------------
    begin                : January 2014
    copyright            : (C) 2014 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSMAPLAYERACTIONREGISTRY_H
#define QGSMAPLAYERACTIONREGISTRY_H

#include <QObject>
#include <QList>
#include <QMap>
#include <QAction>

#include "qgsmaplayer.h"

class QgsFeature;

class GUI_EXPORT QgsMapLayerAction : public QAction
{
    Q_OBJECT
    Q_FLAGS( Availability )

  public:
    enum Target
    {
      Layer = 1,
      SingleFeature = 2,
      MultipleFeatures = 4,
      AllActions = Layer | SingleFeature | MultipleFeatures
    };
    Q_DECLARE_FLAGS( Targets, Target )

    
    QgsMapLayerAction( QString name, QObject *parent, Targets targets = AllActions, QIcon icon = QIcon() );

    QgsMapLayerAction( QString name, QObject *parent, QgsMapLayer* layer, Targets targets = AllActions, QIcon icon = QIcon() );

    QgsMapLayerAction( QString name, QObject *parent, QgsMapLayer::LayerType layerType, Targets targets = AllActions, QIcon icon = QIcon() );

    ~QgsMapLayerAction();

    bool canRunUsingLayer( QgsMapLayer* layer ) const;

    void triggerForFeatures( QgsMapLayer* layer, const QList<QgsFeature> featureList );

    void triggerForFeature( QgsMapLayer* layer, const QgsFeature* feature );

    void triggerForLayer( QgsMapLayer* layer );

    void setTargets( Targets targets ) {mTargets = targets;}
    const Targets& targets() const {return mTargets;}

  signals:
    void triggeredForFeatures( QgsMapLayer* layer, const QList<QgsFeature> featureList );

    void triggeredForFeature( QgsMapLayer* layer, const QgsFeature& feature );

    void triggeredForLayer( QgsMapLayer* layer );

  private:

    // true if action is only valid for a single layer
    bool mSingleLayer;
    // layer if action is only valid for a single layer
    QgsMapLayer* mActionLayer;

    // true if action is only valid for a specific layer type
    bool mSpecificLayerType;
    // layer type if action is only valid for a specific layer type
    QgsMapLayer::LayerType mLayerType;

    // determine if the action can be run on layer and/or single feature and/or multiple features
    Targets mTargets;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QgsMapLayerAction::Targets )


class GUI_EXPORT QgsMapLayerActionRegistry : public QObject
{
    Q_OBJECT

  public:
    static QgsMapLayerActionRegistry * instance();

    ~QgsMapLayerActionRegistry();

    void addMapLayerAction( QgsMapLayerAction * action );

    QList<QgsMapLayerAction *> mapLayerActions( QgsMapLayer* layer, QgsMapLayerAction::Targets targets = QgsMapLayerAction::AllActions );

    bool removeMapLayerAction( QgsMapLayerAction *action );

    void setDefaultActionForLayer( QgsMapLayer* layer, QgsMapLayerAction* action );
    QgsMapLayerAction * defaultActionForLayer( QgsMapLayer* layer );

  protected:
    QgsMapLayerActionRegistry( QObject * parent = 0 );

    QList< QgsMapLayerAction* > mMapLayerActionList;

  signals:
    void changed();

  private:

    static QgsMapLayerActionRegistry *mInstance;

    QMap< QgsMapLayer*, QgsMapLayerAction* > mDefaultLayerActionMap;

};

#endif // QGSMAPLAYERACTIONREGISTRY_H