qgstextpreview.h

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/***************************************************************************
    qgstextpreview.h
    ----------------
    begin                : October 2016
    copyright            : (C) 2016 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 QGSTEXTPREVIEW_H
#define QGSTEXTPREVIEW_H
 
#include "qgstextformat.h"
#include "qgsrendercontext.h"
 
#include <QLabel>
#include "qgis_gui.h"
 
class QgsScreenHelper;
 
class GUI_EXPORT QgsTextPreview : public QLabel
{
    Q_OBJECT
 
    Q_PROPERTY( QgsTextFormat format READ format WRITE setFormat )
    Q_PROPERTY( double scale READ scale WRITE setScale )
    Q_PROPERTY( Qgis::DistanceUnit mapUnits READ mapUnits WRITE setMapUnits )
 
  public:
    QgsTextPreview( QWidget *parent = nullptr );
 
    void paintEvent( QPaintEvent *e ) override;
 
    void setFormat( const QgsTextFormat &format );
 
    QgsTextFormat format() const { return mFormat; }
 
    void setScale( double scale );
 
    double scale() const { return mScale; }
 
    void setMapUnits( Qgis::DistanceUnit unit );
 
    Qgis::DistanceUnit mapUnits() const { return mMapUnits; }
 
  private:
    QgsScreenHelper *mScreenHelper = nullptr;
 
    QgsTextFormat mFormat;
    QgsRenderContext mContext;
    double mScale = -1;
    Qgis::DistanceUnit mMapUnits = Qgis::DistanceUnit::Meters;
    void updateContext();
};
 
#endif // QGSTEXTPREVIEW_H