qgscalloutwidget.h

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/***************************************************************************
    qgscalloutwidget.h
    ---------------------
    begin                : July 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 QGSCALLOUTWIDGET_H
#define QGSCALLOUTWIDGET_H

#include "qgspropertyoverridebutton.h"
#include "qgis_sip.h"
#include "qgssymbolwidgetcontext.h"
#include "qgscallout.h"
#include <QWidget>
#include <QStandardItemModel>

class QgsVectorLayer;
class QgsMapCanvas;

class GUI_EXPORT QgsCalloutWidget : public QWidget, protected QgsExpressionContextGenerator
{
    Q_OBJECT

  public:

    QgsCalloutWidget( QWidget *parent SIP_TRANSFERTHIS, QgsVectorLayer *vl = nullptr )
      : QWidget( parent )
      , mVectorLayer( vl )
    {}

    virtual void setCallout( QgsCallout *callout ) = 0;

    virtual QgsCallout *callout() = 0;

    virtual void setContext( const QgsSymbolWidgetContext &context );

    QgsSymbolWidgetContext context() const;

    const QgsVectorLayer *vectorLayer() const { return mVectorLayer; }

    virtual void setGeometryType( QgsWkbTypes::GeometryType type ) = 0;

  protected:

    void registerDataDefinedButton( QgsPropertyOverrideButton *button, QgsCallout::Property key );

    QgsExpressionContext createExpressionContext() const override;

  private:
    QgsVectorLayer *mVectorLayer = nullptr;

    QgsMapCanvas *mMapCanvas = nullptr;

  signals:

    void changed();

  private slots:
    void updateDataDefinedProperty();

    void createAuxiliaryField();

  private:
    QgsSymbolWidgetContext mContext;
};



#include "ui_widget_simplelinecallout.h"

class QgsSimpleLineCallout;

#ifndef SIP_RUN

class GUI_EXPORT QgsSimpleLineCalloutWidget : public QgsCalloutWidget, private Ui::WidgetSimpleLineCallout
{
    Q_OBJECT

  public:

    QgsSimpleLineCalloutWidget( QgsVectorLayer *vl, QWidget *parent SIP_TRANSFERTHIS = nullptr );

    static QgsCalloutWidget *create( QgsVectorLayer *vl ) SIP_FACTORY { return new QgsSimpleLineCalloutWidget( vl ); }

    void setCallout( QgsCallout *callout ) override;

    QgsCallout *callout() override;

    void setGeometryType( QgsWkbTypes::GeometryType type ) override;

  private slots:

    void minimumLengthChanged();
    void minimumLengthUnitWidgetChanged();
    void offsetFromAnchorUnitWidgetChanged();
    void offsetFromAnchorChanged();
    void offsetFromLabelUnitWidgetChanged();
    void offsetFromLabelChanged();
    void lineSymbolChanged();
    void mAnchorPointComboBox_currentIndexChanged( int index );
    void drawToAllPartsToggled( bool active );

  private:
    std::unique_ptr< QgsSimpleLineCallout > mCallout;

};

class GUI_EXPORT QgsManhattanLineCalloutWidget : public QgsSimpleLineCalloutWidget
{
    Q_OBJECT

  public:

    QgsManhattanLineCalloutWidget( QgsVectorLayer *vl, QWidget *parent SIP_TRANSFERTHIS = nullptr );

    static QgsCalloutWidget *create( QgsVectorLayer *vl ) SIP_FACTORY { return new QgsManhattanLineCalloutWidget( vl ); }

};

#endif

#endif // QGSCALLOUTWIDGET_H