qgsprocessingmaplayercombobox.h

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/***************************************************************************
    qgsprocessingmaplayercombobox.h
    -----------------------------
    begin                : June 2019
    copyright            : (C) 2019 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 QGSPROCESSINGMAPLAYERCOMBOBOX_H
#define QGSPROCESSINGMAPLAYERCOMBOBOX_H

#include "qgis.h"
#include "qgis_gui.h"
#include <QTreeView>
#include "qgsprocessingtoolboxmodel.h"
#include "qgsfeatureid.h"
#include "qgsmimedatautils.h"
#include "qgsprocessingcontext.h"


class QgsMapLayerComboBox;
class QToolButton;
class QCheckBox;
class QgsProcessingParameterDefinition;


class GUI_EXPORT QgsProcessingMapLayerComboBox : public QWidget
{
    Q_OBJECT

  public:

    QgsProcessingMapLayerComboBox( const QgsProcessingParameterDefinition *parameter, QWidget *parent = nullptr );

    ~QgsProcessingMapLayerComboBox() override;

    void setLayer( QgsMapLayer *layer );

    QgsMapLayer *currentLayer();

    QString currentText();

    void setValue( const QVariant &value, QgsProcessingContext &context );

    QVariant value() const;

  signals:

    void valueChanged();

    void triggerFileSelection();

  protected:

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

  private slots:

    void onLayerChanged( QgsMapLayer *layer );
    void selectionChanged( const QgsFeatureIds &selected, const QgsFeatureIds &deselected, bool clearAndSelect );

  private:
    std::unique_ptr< QgsProcessingParameterDefinition > mParameter;
    QgsMapLayerComboBox *mCombo = nullptr;
    QToolButton *mSelectButton = nullptr;
    QCheckBox *mUseSelectionCheckBox = nullptr;
    bool mDragActive = false;
    QPointer< QgsMapLayer> mPrevLayer;
    int mBlockChangedSignal = 0;
    QgsMapLayer *compatibleMapLayerFromMimeData( const QMimeData *data, bool &incompatibleLayerSelected ) const;
    QString compatibleUriFromMimeData( const QMimeData *data ) const;
};

#endif // QGSPROCESSINGMAPLAYERCOMBOBOX_H