qgscolorschemelist.h

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/***************************************************************************
    qgscolorschemelist.h
    --------------------
    Date                 : August 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 QGSCOLORSCHEMELIST_H
#define QGSCOLORSCHEMELIST_H

#include "qgscolorscheme.h"
#include <QTreeView>
#include <QAbstractItemModel>
#include <QItemDelegate>
#include <QFile>

class QMimeData;

class GUI_EXPORT QgsColorSwatchDelegate : public QAbstractItemDelegate
{
    Q_OBJECT

  public:
    QgsColorSwatchDelegate( QWidget *parent = nullptr );
    void paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const override;
    QSize sizeHint( const QStyleOptionViewItem & option, const QModelIndex & index ) const override;
    bool editorEvent( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index ) override;

  private:
    QWidget* mParent;

    const QPixmap &transparentBackground() const;
};


class GUI_EXPORT QgsColorSchemeModel: public QAbstractItemModel
{
    Q_OBJECT

  public:

    explicit QgsColorSchemeModel( QgsColorScheme* scheme, const QString &context = QString(), const QColor &baseColor = QColor(), QObject* parent = nullptr );

    ~QgsColorSchemeModel();

    //reimplemented QAbstractItemModel methods
    QModelIndex index( int row, int column, const QModelIndex &parent = QModelIndex() ) const override;
    QModelIndex parent( const QModelIndex &index ) const override;
    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
    int columnCount( const QModelIndex &parent = QModelIndex() ) const override;
    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const override;
    Qt::ItemFlags flags( const QModelIndex & index ) const override;
    bool setData( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole ) override;
    QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const override;
    Qt::DropActions supportedDropActions() const override;
    QStringList mimeTypes() const override;
    bool removeRows( int row, int count, const QModelIndex & parent = QModelIndex() ) override;
    bool insertRows( int row, int count, const QModelIndex &parent = QModelIndex() ) override;
    QMimeData *mimeData( const QModelIndexList &indexes ) const override;
    bool dropMimeData( const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent ) override;

    QgsNamedColorList colors() const { return mColors; }

    void setScheme( QgsColorScheme* scheme, const QString &context = QString(), const QColor &baseColor = QColor() );

    QString context() const { return mContext; }

    QColor baseColor() const { return mBaseColor; }

    void addColor( const QColor &color, const QString &label = QString() );

    bool isDirty() const { return mIsDirty; }

  private:

    enum Columns
    {
      ColorSwatch = 0,
      ColorLabel
    };

    QgsNamedColorList mColors;
    QgsColorScheme* mScheme;
    QString mContext;
    QColor mBaseColor;
    bool mIsDirty;
};

class GUI_EXPORT QgsColorSchemeList: public QTreeView
{
    Q_OBJECT

  public:

    QgsColorSchemeList( QWidget *parent = nullptr, QgsColorScheme* scheme = nullptr, const QString &context = QString(), const QColor &baseColor = QColor() );

    virtual ~QgsColorSchemeList();

    bool saveColorsToScheme();

    bool importColorsFromGpl( QFile &file );

    bool exportColorsToGpl( QFile &file );

    bool isDirty() const;

  public slots:

    void setScheme( QgsColorScheme* scheme, const QString &context = QString(), const QColor &baseColor = QColor() );

    void removeSelection();

    void addColor( const QColor &color, const QString &label = QString() );

    void pasteColors();

    void copyColors();

  signals:

    void colorSelected( const QColor &color );

  protected:

    void keyPressEvent( QKeyEvent* event ) override;

    void mousePressEvent( QMouseEvent* event ) override;

    void mouseReleaseEvent( QMouseEvent* event ) override;

  private:
    QgsColorScheme* mScheme;
    QgsColorSchemeModel* mModel;
    QgsColorSwatchDelegate* mSwatchDelegate;

    QPoint mDragStartPosition;

};

#endif