qgscolorrampshaderwidget.h

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/***************************************************************************
                         qgscolorrampshaderwidget.h
                         --------------------------
    begin                : Jun 2018
    copyright            : (C) 2018 by Peter Petrik
    email                : zilolv 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 QGSCOLORRAMPSHADERWIDGET_H
#define QGSCOLORRAMPSHADERWIDGET_H
 
#include "qgsconfig.h"
#include "ui_qgscolorrampshaderwidgetbase.h"
 
#include "qgis_gui.h"
#include "qgis_sip.h"
#include "qgscolorramplegendnodesettings.h"
#include "qgscolorrampshader.h"
#include "qgsrectangle.h"
 
#include <QPointer>
#include <QStyledItemDelegate>
 
class QgsRasterDataProvider;
class QgsLocaleAwareNumericLineEditDelegate;

class GUI_EXPORT QgsColorRampShaderWidget : public QWidget, protected Ui::QgsColorRampShaderWidgetBase
{
    Q_OBJECT
 
  public:
    QgsColorRampShaderWidget( QWidget *parent = nullptr );
    ~QgsColorRampShaderWidget() override;

    void initializeForUseWithRasterLayer();

    void setRasterDataProvider( QgsRasterDataProvider *dp );

    void setRasterBand( int band );

    void setExtent( const QgsRectangle &extent );

    void setMinimumMaximumAndClassify( double minimum, double maximum );

    void setMinimumMaximum( double minimum, double maximum );

    double minimum() const;

    double maximum() const;

    QgsColorRampShader shader() const;

    void setFromShader( const QgsColorRampShader &colorRampShader );
 
  signals:
    void minimumMaximumChangedFromTree( double minimum, double maximum );

    void widgetChanged();

    void classificationModeChanged( Qgis::ShaderClassificationMethod mode );
 
  public slots:

    void classify();

    void loadMinimumMaximumFromTree();
 
  protected:
    void populateColormapTreeWidget( const QList<QgsColorRampShader::ColorRampItem> &colorRampItems );
 
  private:
    enum Column
    {
      ValueColumn = 0,
      ColorColumn = 1,
      LabelColumn = 2,
    };

    void autoLabel();

    bool colormapMinMax( double &min, double &max ) const;

    void setUnitFromLabels();
 
    QMenu *contextMenu = nullptr;
 
  private slots:
 
    void applyColorRamp();
    void updateColorRamp();
    void mAddEntryButton_clicked();
    void mDeleteEntryButton_clicked();
    void mLoadFromBandButton_clicked();
    void mLoadFromFileButton_clicked();
    void mExportToFileButton_clicked();
    void mUnitLineEdit_textEdited( const QString &text );
    void mColormapTreeWidget_itemDoubleClicked( QTreeWidgetItem *item, int column );
    void mColormapTreeWidget_itemEdited( QTreeWidgetItem *item, int column );
    void mColorInterpolationComboBox_currentIndexChanged( int index );
    void mClassificationModeComboBox_currentIndexChanged( int index );
    void changeColor();
    void changeOpacity();
    void showLegendSettings();
 
  private:
    void setLineEditValue( QLineEdit *lineEdit, double value );
    double lineEditValue( const QLineEdit *lineEdit ) const;
    void resetClassifyButton();
 
    QString createLabel( QTreeWidgetItem *item, int row, const QString unit );
 
#ifdef QGISDEBUG
    void dumpClasses();
#endif
 
    double mMin = std::numeric_limits<double>::quiet_NaN();
    double mMax = std::numeric_limits<double>::quiet_NaN();
 
    // For mode with raster layer
    QPointer<QgsRasterDataProvider> mRasterDataProvider;
    int mBand = -1;
    QgsRectangle mExtent;
    QgsLocaleAwareNumericLineEditDelegate *mValueDelegate = nullptr;
    QgsColorRampLegendNodeSettings mLegendSettings;
 
    int mBlockChanges = 0;
};
 
#endif // QGSCOLORRAMPSHADERWIDGET_H