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New widget QgsTextPreview for previewing all formatting for QgsTextRe…
…nderer Switch the labeling gui to use this widget, which has the benefits: - previews all label settings, including shadow and background - previews at a specified scale, so that any sizes using map units will be correct
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| /** \class QgsTextPreview | ||
| * \ingroup gui | ||
| * A widget for previewing text formatting settings. | ||
| * | ||
| * QgsTextPreview provides a widget for previewing the appearance of text rendered | ||
| * using QgsTextRenderer. The preview includes all settings contained within | ||
| * a QgsTextFormat, including shadow, background and buffer. | ||
| * | ||
| * In order to preview the exact appearance of text which uses sizes in map units, | ||
| * the scale and map units must be set by calling setScale() and setMapUnits(). | ||
| * | ||
| * @note Added in QGIS 3.0 | ||
| */ | ||
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| class QgsTextPreview : public QLabel | ||
| { | ||
| %TypeHeaderCode | ||
| #include <qgstextpreview.h> | ||
| %End | ||
| public: | ||
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| /** Constructor for QgsTextPreview | ||
| * @param parent parent widget | ||
| */ | ||
| QgsTextPreview( QWidget* parent = nullptr ); | ||
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| void paintEvent( QPaintEvent* e ); | ||
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| /** Sets the text format for previewing in the widget. | ||
| * @param format text format | ||
| * @see format() | ||
| */ | ||
| void setFormat( const QgsTextFormat& format ); | ||
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| /** Returns the text format used for previewing text in the widget. | ||
| * @see setFormat() | ||
| */ | ||
| QgsTextFormat format() const; | ||
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| /** Sets the scale to use for previewing format sizes in map units. | ||
| * @param scale preview map scale | ||
| * @see scale() | ||
| * @see setMapUnits() | ||
| */ | ||
| void setScale( double scale ); | ||
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| /** Returns the scale used for previewing format sizes in map units. | ||
| * @see setScale() | ||
| * @see mapUnits() | ||
| */ | ||
| double scale() const; | ||
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| /** Sets the map unit type for previewing format sizes in map units. | ||
| * @param unit map units | ||
| * @see mapUnits() | ||
| * @see setScale() | ||
| */ | ||
| void setMapUnits( QgsUnitTypes::DistanceUnit unit ); | ||
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| /** Returns the map unit type used for previewing format sizes in map units. | ||
| * @see setMapUnits() | ||
| * @see scale() | ||
| */ | ||
| QgsUnitTypes::DistanceUnit mapUnits() const; | ||
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| }; |
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| /*************************************************************************** | ||
| qgstextpreview.cpp | ||
| ------------------ | ||
| 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #include "qgstextpreview.h" | ||
| #include <QDesktopWidget> | ||
| #include <QPainter> | ||
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| QgsTextPreview::QgsTextPreview( QWidget* parent ) | ||
| : QLabel( parent ) | ||
| , mScale( -1 ) | ||
| , mMapUnits( QgsUnitTypes::DistanceMeters ) | ||
| { | ||
| // initially use a basic transform with no scale | ||
| QgsMapToPixel newCoordXForm; | ||
| newCoordXForm.setParameters( 1, 0, 0, 0, 0, 0 ); | ||
| mContext.setMapToPixel( newCoordXForm ); | ||
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| mContext.setScaleFactor( QgsApplication::desktop()->logicalDpiX() / 25.4 ); | ||
| mContext.setUseAdvancedEffects( true ); | ||
| } | ||
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| void QgsTextPreview::paintEvent( QPaintEvent *e ) | ||
| { | ||
| Q_UNUSED( e ); | ||
| QPainter p( this ); | ||
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| p.setRenderHint( QPainter::Antialiasing ); | ||
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| // slightly inset text | ||
| double xtrans = 0; | ||
| if ( mFormat.buffer().enabled() ) | ||
| xtrans = QgsTextRenderer::scaleToPixelContext( mFormat.buffer().size(), mContext, mFormat.buffer().sizeUnit(), false, mFormat.buffer().sizeMapUnitScale() ); | ||
| if ( mFormat.background().enabled() && mFormat.background().sizeType() != QgsTextBackgroundSettings::SizeFixed ) | ||
| xtrans = qMax( xtrans, QgsTextRenderer::scaleToPixelContext( mFormat.background().size().width(), mContext, mFormat.background().sizeUnit(), false, mFormat.background().sizeMapUnitScale() ) ); | ||
| xtrans += 4; | ||
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| double ytrans = 0.0; | ||
| if ( mFormat.buffer().enabled() ) | ||
| ytrans = qMax( ytrans, QgsTextRenderer::scaleToPixelContext( mFormat.buffer().size(), mContext, mFormat.buffer().sizeUnit(), false, mFormat.buffer().sizeMapUnitScale() ) ); | ||
| if ( mFormat.background().enabled() ) | ||
| ytrans = qMax( ytrans, QgsTextRenderer::scaleToPixelContext( mFormat.background().size().height(), mContext, mFormat.background().sizeUnit(), false, mFormat.background().sizeMapUnitScale() ) ); | ||
| ytrans += 4; | ||
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| QRectF textRect = rect(); | ||
| textRect.setLeft( xtrans ); | ||
| textRect.setWidth( textRect.width() - xtrans ); | ||
| textRect.setTop( ytrans ); | ||
| if ( textRect.height() > 300 ) | ||
| textRect.setHeight( 300 ); | ||
| if ( textRect.width() > 2000 ) | ||
| textRect.setWidth( 2000 ); | ||
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| mContext.setPainter( &p ); | ||
| QgsTextRenderer::drawText( textRect, 0 , QgsTextRenderer::AlignLeft, QStringList() << text(), | ||
| mContext, mFormat ); | ||
| } | ||
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| void QgsTextPreview::setFormat( const QgsTextFormat& format ) | ||
| { | ||
| mFormat = format; | ||
| update(); | ||
| } | ||
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| void QgsTextPreview::updateContext() | ||
| { | ||
| if ( mScale >= 0 ) | ||
| { | ||
| QgsMapToPixel newCoordXForm = QgsMapToPixel::fromScale( mScale, mMapUnits, QgsApplication::desktop()->logicalDpiX() ); | ||
| mContext.setMapToPixel( newCoordXForm ); | ||
| } | ||
| update(); | ||
| } | ||
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| void QgsTextPreview::setScale( double scale ) | ||
| { | ||
| mScale = scale; | ||
| updateContext(); | ||
| } | ||
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| void QgsTextPreview::setMapUnits( QgsUnitTypes::DistanceUnit unit ) | ||
| { | ||
| mMapUnits = unit; | ||
| updateContext(); | ||
| } |
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