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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2015 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth 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 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTHQT_LAYERMANAGERWIDGET_H
#define OSGEARTHQT_LAYERMANAGERWIDGET_H 1

#include <osgEarthQt/Actions>
#include <osgEarthQt/Common>
#include <osgEarthQt/DataManager>

#include <osgEarth/Map>

#include <QCheckBox>
#include <QDropEvent>
#include <QFrame>
#include <QHBoxLayout>
#include <QPoint>
#include <QPushButton>
#include <QScrollArea>
#include <QSlider>
#include <QVBoxLayout>
#include <QWidget>
#include <QMimeData>

namespace osgEarth { namespace QtGui 
{
    using namespace osgEarth;

    class LayerManagerWidget;

    //---------------------------------------------------------------------------
    class LayerControlWidgetBase : public QFrame
    {
    Q_OBJECT

    public:
      LayerControlWidgetBase(LayerManagerWidget* parentManager, bool hasContent=true, bool showRemove=true) : _parent(parentManager) { initUi(hasContent, showRemove); }

      virtual Action* getDoubleClickAction(const ViewVector& views) { return 0L; }

      LayerManagerWidget* getParentManager() { return _parent; }

      virtual osgEarth::UID getUID()=0;

    signals:
      void doubleClicked();

    private slots:
      virtual void onRemoveClicked(bool checked);

    protected:
      virtual ~LayerControlWidgetBase();

      virtual void initUi(bool hasContent, bool showRemove);

      void mouseDoubleClickEvent(QMouseEvent* event);
      void mousePressEvent(QMouseEvent* event);
      void mouseMoveEvent(QMouseEvent* event);
      void dragEnterEvent(QDragEnterEvent* event);
      void dragLeaveEvent(QDragLeaveEvent* event);
      //void dragMoveEvent(QDragMoveEvent* event);
      void dropEvent(QDropEvent* event);

      LayerManagerWidget* _parent;
      QVBoxLayout*  _primaryLayout;
      QFrame*       _headerBox;
      QHBoxLayout*  _headerBoxLayout;
      QFrame*       _headerTitleBox;
      QHBoxLayout*  _headerTitleBoxLayout;
      QFrame*       _headerButtonBox;
      QHBoxLayout*  _headerButtonBoxLayout;
      QFrame*       _contentBox;
      QHBoxLayout*  _contentBoxLayout;
      QFrame*       _dropBox;
      QPushButton*  _removeButton;

      QPoint _dragStartPosition;
    };


    //---------------------------------------------------------------------------
    class ElevationLayerControlWidget : public LayerControlWidgetBase
    {
    Q_OBJECT

    public:
      ElevationLayerControlWidget(ElevationLayer* layer, LayerManagerWidget* parentManager);

      Action* getDoubleClickAction(const ViewVector& views);

      osgEarth::UID getUID();

      ElevationLayer* layer() { return _layer.get(); }

      void setLayerVisible(bool value);

    private slots:
      void onEnabledCheckStateChanged(int state);

    protected slots:
      void onRemoveClicked(bool checked);

    protected:
      virtual ~ElevationLayerControlWidget();

      void initUi();

      osg::ref_ptr<ElevationLayer> _layer;
      osg::ref_ptr<Action> _doubleClick;
      osg::ref_ptr<ElevationLayerCallback> _layerCallback;
      QCheckBox* _visibleCheckBox;
    };


    //---------------------------------------------------------------------------
    class ImageLayerControlWidget : public LayerControlWidgetBase
    {
    Q_OBJECT

    public:
      ImageLayerControlWidget(osgEarth::ImageLayer* layer, LayerManagerWidget* parentManager);

      Action* getDoubleClickAction(const ViewVector& views);

      osgEarth::UID getUID();

      osgEarth::ImageLayer* layer() { return _layer.get(); }

      void setLayerVisible(bool value);
      void setLayerOpacity(float opacity);


    private slots:
      void onCheckStateChanged(int state);
      void onSliderValueChanged(int value);

    protected slots:
      void onRemoveClicked(bool checked);

    protected:
      virtual ~ImageLayerControlWidget();

      void initUi();

      osg::ref_ptr<osgEarth::ImageLayer> _layer;
      osg::ref_ptr<Action> _doubleClick;
      osg::ref_ptr<ImageLayerCallback> _layerCallback;
      QCheckBox* _visibleCheckBox;
      QSlider* _opacitySlider;
    };


    //---------------------------------------------------------------------------
    class ModelLayerControlWidget : public LayerControlWidgetBase
    {
    Q_OBJECT

    public:
      ModelLayerControlWidget(ModelLayer* layer, LayerManagerWidget* parentManager, osgEarth::Map* map=0L);

      Action* getDoubleClickAction(const ViewVector& views);

      osgEarth::UID getUID();

      ModelLayer* layer() { return _layer.get(); }

      void setLayerVisible(bool value);
      void setLayerOverlay(bool overlay);

    private slots:
      void onEnabledCheckStateChanged(int state);

    protected slots:
      void onRemoveClicked(bool checked);

    protected:
      virtual ~ModelLayerControlWidget();

      void initUi();

      osg::ref_ptr<ModelLayer> _layer;
      osg::ref_ptr<Map> _map;
      osg::ref_ptr<ModelLayerCallback> _layerCallback;
      osg::ref_ptr<Action> _doubleClick;
      QCheckBox* _visibleCheckBox;
    };




    //---------------------------------------------------------------------------
    class LayerWidgetMimeData : public QMimeData
    {
    Q_OBJECT

    public:
      static const QString MIME_TYPE;

      LayerWidgetMimeData(LayerControlWidgetBase* widget) : _widget(widget) {}

      bool hasFormat(const QString &mimeType) const
      {
        if (mimeType == MIME_TYPE)
          return true;

        return false;
      }

      QStringList formats() const
      {
        QStringList formats;
        formats << MIME_TYPE;

        return formats;
      }

      QVariant retrieveData(const QString &mimeType, QVariant::Type type) const
      {
        return QVariant();
      }

      LayerControlWidgetBase* getWidget() const { return _widget; }

    private:
      LayerControlWidgetBase* _widget;
    };


    //---------------------------------------------------------------------------
    class OSGEARTHQT_EXPORT LayerManagerWidget : public QScrollArea
    {
    Q_OBJECT

    public:
      enum LayerType {
        ELEVATION_LAYERS,
        IMAGE_LAYERS,
        MODEL_LAYERS
      };

      LayerManagerWidget(DataManager* dm, LayerType type=IMAGE_LAYERS);
      LayerManagerWidget(osgEarth::Map* map, LayerType type=IMAGE_LAYERS);

      void setActiveView(osgViewer::View* view);
      void setActiveViews(const ViewVector& views);

      void resetStyleSheet();

      osgEarth::Map* getMap() { return _map.get(); }

    private slots:
      void onItemDoubleClicked();

    private:
      friend struct LayerManagerMapCallback;

      QWidget* findItemByUID(osgEarth::UID uid, int* out_row=0L);

      void addElevationLayerItem(osgEarth::ElevationLayer* layer, int index=-1);
      void addImageLayerItem(osgEarth::ImageLayer* layer, int index=-1);
      void addModelLayerItem(osgEarth::ModelLayer* layer, int index=-1);
      void removeLayerItem(osgEarth::Layer* layer);
      void moveLayerItem(osgEarth::Layer* layer, int oldIndex, int newIndex);

    protected:
      friend class LayerControlWidgetBase;

      static const std::string DEFAULT_STYLESHEET;

      void initialize();
      void refresh();

      void dragEnterEvent(QDragEnterEvent* event);
      void dragLeaveEvent(QDragLeaveEvent* event);
      void dropEvent(QDropEvent* event);

      void doLayerWidgetDrop(LayerControlWidgetBase* widget, LayerControlWidgetBase* dropOn=0L);

      osg::ref_ptr<DataManager> _manager;
      osg::ref_ptr<osgEarth::Map> _map;
      ViewVector _views;
      LayerType _type;

      QVBoxLayout*  _stack;
      QFrame*       _dropBox;

      bool _dragging;
      int _dragId;
      osg::observer_ptr<osg::Referenced> _dragLayer;
    };
} }

#endif // OSGEARTHQT_LAYERMANAGERWIDGET_H