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qgslayertreemodellegendnode.cpp
1535 lines (1297 loc) · 50 KB
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qgslayertreemodellegendnode.cpp
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/***************************************************************************
qgslayertreemodellegendnode.cpp
--------------------------------------
Date : August 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot com
QgsWMSLegendNode : Sandro Santilli < strk at keybit dot net >
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "qgslayertreemodellegendnode.h"
#include "qgsdatadefinedsizelegend.h"
#include "qgslayertree.h"
#include "qgslayertreemodel.h"
#include "qgslegendsettings.h"
#include "qgsrasterlayer.h"
#include "qgsrenderer.h"
#include "qgssymbollayerutils.h"
#include "qgsimageoperation.h"
#include "qgsvectorlayer.h"
#include "qgspointcloudlayer.h"
#include "qgspointcloudrenderer.h"
#include "qgsrasterrenderer.h"
#include "qgsexpressioncontextutils.h"
#include "qgsfeatureid.h"
#include "qgslayoutitem.h"
#include "qgsvectorlayerfeaturecounter.h"
#include "qgsexpression.h"
#include "qgstextrenderer.h"
#include "qgssettings.h"
#include "qgsfileutils.h"
#include "qgsmarkersymbol.h"
#include <QBuffer>
QgsLayerTreeModelLegendNode::QgsLayerTreeModelLegendNode( QgsLayerTreeLayer *nodeL, QObject *parent )
: QObject( parent )
, mLayerNode( nodeL )
, mEmbeddedInParent( false )
{
}
QgsLayerTreeModel *QgsLayerTreeModelLegendNode::model() const
{
return qobject_cast<QgsLayerTreeModel *>( parent() );
}
Qt::ItemFlags QgsLayerTreeModelLegendNode::flags() const
{
return Qt::ItemIsEnabled;
}
bool QgsLayerTreeModelLegendNode::setData( const QVariant &value, int role )
{
Q_UNUSED( value )
Q_UNUSED( role )
return false;
}
QSizeF QgsLayerTreeModelLegendNode::userPatchSize() const
{
if ( mEmbeddedInParent )
return mLayerNode->patchSize();
return mUserSize;
}
void QgsLayerTreeModelLegendNode::setUserPatchSize( QSizeF size )
{
if ( mUserSize == size )
return;
mUserSize = size;
emit sizeChanged();
}
QgsLayerTreeModelLegendNode::ItemMetrics QgsLayerTreeModelLegendNode::draw( const QgsLegendSettings &settings, ItemContext *ctx )
{
QFont symbolLabelFont = settings.style( QgsLegendStyle::SymbolLabel ).font();
double textHeight = settings.fontHeightCharacterMM( symbolLabelFont, QChar( '0' ) );
// itemHeight here is not really item height, it is only for symbol
// vertical alignment purpose, i.e. OK take single line height
// if there are more lines, those run under the symbol
double itemHeight = std::max( static_cast< double >( ctx && ctx->patchSize.height() > 0 ? ctx->patchSize.height() : settings.symbolSize().height() ), textHeight );
ItemMetrics im;
im.symbolSize = drawSymbol( settings, ctx, itemHeight );
im.labelSize = drawSymbolText( settings, ctx, im.symbolSize );
return im;
}
QJsonObject QgsLayerTreeModelLegendNode::exportToJson( const QgsLegendSettings &settings, const QgsRenderContext &context )
{
QJsonObject json = exportSymbolToJson( settings, context );
const QString text = data( Qt::DisplayRole ).toString();
json[ QStringLiteral( "title" ) ] = text;
return json;
}
QSizeF QgsLayerTreeModelLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const
{
QIcon symbolIcon = data( Qt::DecorationRole ).value<QIcon>();
if ( symbolIcon.isNull() )
return QSizeF();
QSizeF size = settings.symbolSize();
if ( ctx )
{
if ( ctx->patchSize.width() > 0 )
size.setWidth( ctx->patchSize.width( ) );
if ( ctx->patchSize.height() > 0 )
size.setHeight( ctx->patchSize.height( ) );
}
if ( ctx && ctx->painter )
{
switch ( settings.symbolAlignment() )
{
case Qt::AlignLeft:
default:
symbolIcon.paint( ctx->painter,
static_cast< int >( ctx->columnLeft ),
static_cast< int >( ctx->top + ( itemHeight - size.height() ) / 2 ),
static_cast< int >( size.width() ),
static_cast< int >( size.height() ) );
break;
case Qt::AlignRight:
symbolIcon.paint( ctx->painter,
static_cast< int >( ctx->columnRight - size.width() ),
static_cast< int >( ctx->top + ( itemHeight - size.height() ) / 2 ),
static_cast< int >( size.width() ),
static_cast< int >( size.height() ) );
break;
}
}
return size;
}
QJsonObject QgsLayerTreeModelLegendNode::exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext & ) const
{
const QIcon icon = data( Qt::DecorationRole ).value<QIcon>();
if ( icon.isNull() )
return QJsonObject();
const QImage image( icon.pixmap( settings.symbolSize().width(), settings.symbolSize().height() ).toImage() );
QByteArray byteArray;
QBuffer buffer( &byteArray );
image.save( &buffer, "PNG" );
const QString base64 = QString::fromLatin1( byteArray.toBase64().data() );
QJsonObject json;
json[ QStringLiteral( "icon" ) ] = base64;
return json;
}
QSizeF QgsLayerTreeModelLegendNode::drawSymbolText( const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize ) const
{
QSizeF labelSize( 0, 0 );
QFont symbolLabelFont = settings.style( QgsLegendStyle::SymbolLabel ).font();
double textHeight = settings.fontHeightCharacterMM( symbolLabelFont, QChar( '0' ) );
double textDescent = settings.fontDescentMillimeters( symbolLabelFont );
QgsExpressionContext tempContext;
const QStringList lines = settings.evaluateItemText( data( Qt::DisplayRole ).toString(), ctx && ctx->context ? ctx->context->expressionContext() : tempContext );
labelSize.rheight() = lines.count() * textHeight + ( lines.count() - 1 ) * ( settings.lineSpacing() + textDescent );
double labelXMin = 0.0;
double labelXMax = 0.0;
double labelY = 0.0;
if ( ctx && ctx->painter )
{
ctx->painter->setPen( settings.fontColor() );
switch ( settings.symbolAlignment() )
{
case Qt::AlignLeft:
default:
labelXMin = ctx->columnLeft + std::max( static_cast< double >( symbolSize.width() ), ctx->maxSiblingSymbolWidth )
+ settings.style( QgsLegendStyle::Symbol ).margin( QgsLegendStyle::Right )
+ settings.style( QgsLegendStyle::SymbolLabel ).margin( QgsLegendStyle::Left );
labelXMax = ctx->columnRight;
break;
case Qt::AlignRight:
labelXMin = ctx->columnLeft;
// NOTE -- while the below calculations use the flipped margins from the style, that's only done because
// those are the only margins we expose and use for now! (and we expose them as generic margins, not side-specific
// ones) TODO when/if we expose other margin settings, these should be reversed...
labelXMax = ctx->columnRight - std::max( static_cast< double >( symbolSize.width() ), ctx->maxSiblingSymbolWidth )
- settings.style( QgsLegendStyle::Symbol ).margin( QgsLegendStyle::Right )
- settings.style( QgsLegendStyle::SymbolLabel ).margin( QgsLegendStyle::Left );
break;
}
labelY = ctx->top;
// Vertical alignment of label with symbol
if ( labelSize.height() < symbolSize.height() )
labelY += symbolSize.height() / 2 - labelSize.height() / 2; // label centered with symbol
labelY += textHeight;
}
for ( QStringList::ConstIterator itemPart = lines.constBegin(); itemPart != lines.constEnd(); ++itemPart )
{
const double lineWidth = settings.textWidthMillimeters( symbolLabelFont, *itemPart );
labelSize.rwidth() = std::max( lineWidth, double( labelSize.width() ) );
if ( ctx && ctx->painter )
{
switch ( settings.style( QgsLegendStyle::SymbolLabel ).alignment() )
{
case Qt::AlignLeft:
default:
settings.drawText( ctx->painter, labelXMin, labelY, *itemPart, symbolLabelFont );
break;
case Qt::AlignRight:
settings.drawText( ctx->painter, labelXMax - lineWidth, labelY, *itemPart, symbolLabelFont );
break;
case Qt::AlignHCenter:
settings.drawText( ctx->painter, labelXMin + ( labelXMax - labelXMin - lineWidth ) / 2.0, labelY, *itemPart, symbolLabelFont );
break;
}
if ( itemPart != ( lines.end() - 1 ) )
labelY += textDescent + settings.lineSpacing() + textHeight;
}
}
return labelSize;
}
void QgsLayerTreeModelLegendNode::checkAllItems()
{
checkAll( true );
}
void QgsLayerTreeModelLegendNode::uncheckAllItems()
{
checkAll( false );
}
void QgsLayerTreeModelLegendNode::toggleAllItems()
{
if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() ) )
{
if ( !vlayer->renderer() )
return;
const QgsLegendSymbolList symbolList = vlayer->renderer()->legendSymbolItems();
for ( const auto &item : symbolList )
{
vlayer->renderer()->checkLegendSymbolItem( item.ruleKey(), ! vlayer->renderer()->legendSymbolItemChecked( item.ruleKey() ) );
}
emit dataChanged();
vlayer->emitStyleChanged();
vlayer->triggerRepaint();
}
else if ( QgsPointCloudLayer *pclayer = qobject_cast<QgsPointCloudLayer *>( mLayerNode->layer() ) )
{
if ( !pclayer->renderer() )
return;
const QStringList ruleKeys = pclayer->renderer()->legendRuleKeys();
for ( const QString &rule : ruleKeys )
{
pclayer->renderer()->checkLegendItem( rule, !pclayer->renderer()->legendItemChecked( rule ) );
}
emit dataChanged();
pclayer->emitStyleChanged();
pclayer->triggerRepaint();
}
}
// -------------------------------------------------------------------------
double QgsSymbolLegendNode::MINIMUM_SIZE = -1.0;
double QgsSymbolLegendNode::MAXIMUM_SIZE = -1.0;
QgsSymbolLegendNode::QgsSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsLegendSymbolItem &item, QObject *parent )
: QgsLayerTreeModelLegendNode( nodeLayer, parent )
, mItem( item )
, mSymbolUsesMapUnits( false )
{
const int iconSize = QgsLayerTreeModel::scaleIconSize( 16 );
mIconSize = QSize( iconSize, iconSize );
if ( MINIMUM_SIZE < 0 )
{
// it's FAR too expensive to construct a QgsSettings object for every symbol node, especially for complex
// projects. So only read the valid size ranges once, and store them for subsequent use
QgsSettings settings;
MINIMUM_SIZE = settings.value( "/qgis/legendsymbolMinimumSize", 0.5 ).toDouble();
MAXIMUM_SIZE = settings.value( "/qgis/legendsymbolMaximumSize", 20.0 ).toDouble();
}
updateLabel();
if ( QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( nodeLayer->layer() ) )
connect( vl, &QgsVectorLayer::symbolFeatureCountMapChanged, this, &QgsSymbolLegendNode::updateLabel );
connect( nodeLayer, &QObject::destroyed, this, [ = ]() { mLayerNode = nullptr; } );
if ( const QgsSymbol *symbol = mItem.symbol() )
{
mSymbolUsesMapUnits = symbol->usesMapUnits();
}
}
Qt::ItemFlags QgsSymbolLegendNode::flags() const
{
if ( mItem.isCheckable() )
return Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
else
return Qt::ItemIsEnabled;
}
QSize QgsSymbolLegendNode::minimumIconSize() const
{
std::unique_ptr<QgsRenderContext> context( createTemporaryRenderContext() );
return minimumIconSize( context.get() );
}
QSize QgsSymbolLegendNode::minimumIconSize( QgsRenderContext *context ) const
{
const int iconSize = QgsLayerTreeModel::scaleIconSize( 16 );
const int largeIconSize = QgsLayerTreeModel::scaleIconSize( 512 );
QSize minSz( iconSize, iconSize );
if ( mItem.symbol() && mItem.symbol()->type() == Qgis::SymbolType::Marker )
{
// unusued width, height variables
double width = 0.0;
double height = 0.0;
std::unique_ptr<QgsSymbol> symbol( QgsSymbolLayerUtils::restrictedSizeSymbol( mItem.symbol(), MINIMUM_SIZE, MAXIMUM_SIZE, context, width, height ) );
minSz = QgsImageOperation::nonTransparentImageRect(
QgsSymbolLayerUtils::symbolPreviewPixmap( symbol ? symbol.get() : mItem.symbol(), QSize( largeIconSize, largeIconSize ), 0,
context ).toImage(),
minSz,
true ).size();
}
else if ( mItem.symbol() && mItem.symbol()->type() == Qgis::SymbolType::Line )
{
double width = 0.0;
double height = 0.0;
std::unique_ptr<QgsSymbol> symbol( QgsSymbolLayerUtils::restrictedSizeSymbol( mItem.symbol(), MINIMUM_SIZE, MAXIMUM_SIZE, context, width, height ) );
minSz = QgsImageOperation::nonTransparentImageRect(
QgsSymbolLayerUtils::symbolPreviewPixmap( symbol ? symbol.get() : mItem.symbol(), QSize( minSz.width(), largeIconSize ), 0,
context ).toImage(),
minSz,
true ).size();
}
if ( !mTextOnSymbolLabel.isEmpty() && context )
{
double w = QgsTextRenderer::textWidth( *context, mTextOnSymbolTextFormat, QStringList() << mTextOnSymbolLabel );
double h = QgsTextRenderer::textHeight( *context, mTextOnSymbolTextFormat, QStringList() << mTextOnSymbolLabel, QgsTextRenderer::Point );
int wInt = ceil( w ), hInt = ceil( h );
if ( wInt > minSz.width() ) minSz.setWidth( wInt );
if ( hInt > minSz.height() ) minSz.setHeight( hInt );
}
return minSz;
}
const QgsSymbol *QgsSymbolLegendNode::symbol() const
{
return mItem.symbol();
}
QString QgsSymbolLegendNode::symbolLabel() const
{
QString label;
if ( mEmbeddedInParent )
{
QVariant legendlabel = mLayerNode->customProperty( QStringLiteral( "legend/title-label" ) );
QString layerName = legendlabel.isNull() ? mLayerNode->name() : legendlabel.toString();
label = mUserLabel.isEmpty() ? layerName : mUserLabel;
}
else
label = mUserLabel.isEmpty() ? mItem.label() : mUserLabel;
return label;
}
QgsLegendPatchShape QgsSymbolLegendNode::patchShape() const
{
if ( mEmbeddedInParent )
{
return mLayerNode->patchShape();
}
else
{
return mPatchShape;
}
}
void QgsSymbolLegendNode::setPatchShape( const QgsLegendPatchShape &shape )
{
mPatchShape = shape;
}
QgsSymbol *QgsSymbolLegendNode::customSymbol() const
{
return mCustomSymbol.get();
}
void QgsSymbolLegendNode::setCustomSymbol( QgsSymbol *symbol )
{
mCustomSymbol.reset( symbol );
}
void QgsSymbolLegendNode::setSymbol( QgsSymbol *symbol )
{
if ( !symbol )
return;
std::unique_ptr< QgsSymbol > s( symbol ); // this method takes ownership of symbol
QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
if ( !vlayer || !vlayer->renderer() )
return;
mItem.setSymbol( s.get() ); // doesn't transfer ownership
vlayer->renderer()->setLegendSymbolItem( mItem.ruleKey(), s.release() ); // DOES transfer ownership!
mPixmap = QPixmap();
emit dataChanged();
vlayer->triggerRepaint();
}
QgsRenderContext *QgsLayerTreeModelLegendNode::createTemporaryRenderContext() const
{
double scale = 0.0;
double mupp = 0.0;
int dpi = 0;
if ( auto *lModel = model() )
lModel->legendMapViewData( &mupp, &dpi, &scale );
if ( qgsDoubleNear( mupp, 0.0 ) || dpi == 0 || qgsDoubleNear( scale, 0.0 ) )
return nullptr;
// setup temporary render context
std::unique_ptr<QgsRenderContext> context = std::make_unique<QgsRenderContext>( );
context->setScaleFactor( dpi / 25.4 );
context->setRendererScale( scale );
context->setMapToPixel( QgsMapToPixel( mupp ) );
context->setFlag( QgsRenderContext::Antialiasing, true );
context->setFlag( QgsRenderContext::RenderSymbolPreview, true );
return context.release();
}
void QgsLayerTreeModelLegendNode::checkAll( bool state )
{
if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() ) )
{
if ( !vlayer->renderer() )
return;
const QgsLegendSymbolList symbolList = vlayer->renderer()->legendSymbolItems();
for ( const auto &item : symbolList )
{
vlayer->renderer()->checkLegendSymbolItem( item.ruleKey(), state );
}
emit dataChanged();
vlayer->emitStyleChanged();
vlayer->triggerRepaint();
}
else if ( QgsPointCloudLayer *pclayer = qobject_cast<QgsPointCloudLayer *>( mLayerNode->layer() ) )
{
if ( !pclayer->renderer() )
return;
const QStringList ruleKeys = pclayer->renderer()->legendRuleKeys();
for ( const QString &rule : ruleKeys )
{
pclayer->renderer()->checkLegendItem( rule, state );
}
emit dataChanged();
pclayer->emitStyleChanged();
pclayer->triggerRepaint();
}
}
QVariant QgsSymbolLegendNode::data( int role ) const
{
if ( role == Qt::DisplayRole )
{
return mLabel;
}
else if ( role == Qt::EditRole )
{
return mUserLabel.isEmpty() ? mItem.label() : mUserLabel;
}
else if ( role == Qt::DecorationRole )
{
if ( mPixmap.isNull() || mPixmap.size() != mIconSize )
{
QPixmap pix;
if ( mItem.symbol() )
{
std::unique_ptr<QgsRenderContext> context( createTemporaryRenderContext() );
// unusued width, height variables
double width = 0.0;
double height = 0.0;
std::unique_ptr<QgsSymbol> symbol( QgsSymbolLayerUtils::restrictedSizeSymbol( mItem.symbol(), MINIMUM_SIZE, MAXIMUM_SIZE, context.get(), width, height ) );
pix = QgsSymbolLayerUtils::symbolPreviewPixmap( symbol ? symbol.get() : mItem.symbol(), mIconSize, 0, context.get() );
if ( !mTextOnSymbolLabel.isEmpty() && context )
{
QPainter painter( &pix );
painter.setRenderHint( QPainter::Antialiasing );
context->setPainter( &painter );
QFontMetricsF fm( mTextOnSymbolTextFormat.scaledFont( *context ) );
qreal yBaselineVCenter = ( mIconSize.height() + fm.ascent() - fm.descent() ) / 2;
QgsTextRenderer::drawText( QPointF( mIconSize.width() / 2, yBaselineVCenter ), 0, QgsTextRenderer::AlignCenter,
QStringList() << mTextOnSymbolLabel, *context, mTextOnSymbolTextFormat );
}
}
else
{
pix = QPixmap( mIconSize );
pix.fill( Qt::transparent );
}
mPixmap = pix;
}
return mPixmap;
}
else if ( role == Qt::CheckStateRole )
{
if ( !mItem.isCheckable() )
return QVariant();
if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() ) )
{
if ( !vlayer->renderer() )
return QVariant();
return vlayer->renderer()->legendSymbolItemChecked( mItem.ruleKey() ) ? Qt::Checked : Qt::Unchecked;
}
}
else if ( role == RuleKeyRole )
{
return mItem.ruleKey();
}
else if ( role == ParentRuleKeyRole )
{
return mItem.parentRuleKey();
}
else if ( role == QgsLayerTreeModelLegendNode::NodeTypeRole )
{
return QgsLayerTreeModelLegendNode::SymbolLegend;
}
return QVariant();
}
bool QgsSymbolLegendNode::setData( const QVariant &value, int role )
{
if ( role != Qt::CheckStateRole )
return false;
if ( !mItem.isCheckable() )
return false;
QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
if ( !vlayer || !vlayer->renderer() )
return false;
vlayer->renderer()->checkLegendSymbolItem( mItem.ruleKey(), value == Qt::Checked );
emit dataChanged();
vlayer->emitStyleChanged();
vlayer->triggerRepaint();
return true;
}
QSizeF QgsSymbolLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const
{
QgsSymbol *s = mCustomSymbol ? mCustomSymbol.get() : mItem.symbol();
if ( !s )
{
return QSizeF();
}
// setup temporary render context
QgsRenderContext *context = nullptr;
std::unique_ptr< QgsRenderContext > tempRenderContext;
QgsLegendPatchShape patchShape = ctx ? ctx->patchShape : QgsLegendPatchShape();
if ( ctx && ctx->context )
context = ctx->context;
else
{
tempRenderContext = std::make_unique< QgsRenderContext >();
// QGIS 4.0 - make ItemContext compulsory, so we don't have to construct temporary render contexts here
Q_NOWARN_DEPRECATED_PUSH
tempRenderContext->setScaleFactor( settings.dpi() / 25.4 );
tempRenderContext->setRendererScale( settings.mapScale() );
tempRenderContext->setFlag( QgsRenderContext::Antialiasing, true );
tempRenderContext->setMapToPixel( QgsMapToPixel( 1 / ( settings.mmPerMapUnit() * tempRenderContext->scaleFactor() ) ) );
Q_NOWARN_DEPRECATED_POP
tempRenderContext->setForceVectorOutput( true );
tempRenderContext->setPainter( ctx ? ctx->painter : nullptr );
// setup a minimal expression context
QgsExpressionContext expContext;
expContext.appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( nullptr ) );
tempRenderContext->setExpressionContext( expContext );
context = tempRenderContext.get();
}
//Consider symbol size for point markers
const double desiredHeight = ctx && ctx->patchSize.height() > 0 ? ctx->patchSize.height() : settings.symbolSize().height();
const double desiredWidth = ctx && ctx->patchSize.width() > 0 ? ctx->patchSize.width() : settings.symbolSize().width();
double height = desiredHeight;
double width = desiredWidth;
//Center small marker symbols
double widthOffset = 0;
double heightOffset = 0;
double maxSymbolSize = settings.maximumSymbolSize();
double minSymbolSize = settings.minimumSymbolSize();
if ( QgsMarkerSymbol *markerSymbol = dynamic_cast<QgsMarkerSymbol *>( s ) )
{
double size = markerSymbol->size( *context ) / context->scaleFactor();
height = size;
width = size;
}
std::unique_ptr<QgsSymbol> minMaxSizeSymbol( QgsSymbolLayerUtils::restrictedSizeSymbol( s, minSymbolSize, maxSymbolSize, context, width, height ) );
if ( minMaxSizeSymbol )
{
s = minMaxSizeSymbol.get();
}
if ( s->type() == Qgis::SymbolType::Marker )
{
if ( width < desiredWidth )
{
widthOffset = ( desiredWidth - width ) / 2.0;
}
if ( height < desiredHeight )
{
heightOffset = ( desiredHeight - height ) / 2.0;
}
}
if ( ctx && ctx->painter )
{
double currentYCoord = ctx->top + ( itemHeight - desiredHeight ) / 2;
QPainter *p = ctx->painter;
//setup painter scaling to dots so that raster symbology is drawn to scale
double dotsPerMM = context->scaleFactor();
int opacity = 255;
if ( QgsMapLayer *layer = layerNode()->layer() )
opacity = static_cast<int >( std::round( 255 * layer->opacity() ) );
QgsScopedQPainterState painterState( p );
context->setPainterFlagsUsingContext( p );
switch ( settings.symbolAlignment() )
{
case Qt::AlignLeft:
default:
p->translate( ctx->columnLeft + widthOffset, currentYCoord + heightOffset );
break;
case Qt::AlignRight:
p->translate( ctx->columnRight - widthOffset - width, currentYCoord + heightOffset );
break;
}
p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
Q_NOWARN_DEPRECATED_PUSH
// QGIS 4.0 -- ctx->context will be mandatory
const bool useAdvancedEffects = ctx->context ? ctx->context->flags() & QgsRenderContext::UseAdvancedEffects : settings.useAdvancedEffects();
Q_NOWARN_DEPRECATED_POP
if ( opacity != 255 && useAdvancedEffects )
{
const int maxBleed = static_cast< int >( std::ceil( QgsSymbolLayerUtils::estimateMaxSymbolBleed( s, *context ) ) );
//semi transparent layer, so need to draw symbol to an image (to flatten it first)
//create image which is same size as legend rect, in case symbol bleeds outside its allotted space
const QSize symbolSize( static_cast< int >( std::round( width * dotsPerMM ) ), static_cast<int >( std::round( height * dotsPerMM ) ) );
const QSize tempImageSize( symbolSize.width() + maxBleed * 2, symbolSize.height() + maxBleed * 2 );
QImage tempImage = QImage( tempImageSize, QImage::Format_ARGB32 );
tempImage.fill( Qt::transparent );
QPainter imagePainter( &tempImage );
context->setPainterFlagsUsingContext( &imagePainter );
context->setPainter( &imagePainter );
imagePainter.translate( maxBleed, maxBleed );
s->drawPreviewIcon( &imagePainter, symbolSize, context, false, nullptr, &patchShape );
imagePainter.translate( -maxBleed, -maxBleed );
context->setPainter( ctx->painter );
//reduce opacity of image
imagePainter.setCompositionMode( QPainter::CompositionMode_DestinationIn );
imagePainter.fillRect( tempImage.rect(), QColor( 0, 0, 0, opacity ) );
imagePainter.end();
//draw rendered symbol image
p->drawImage( -maxBleed, -maxBleed, tempImage );
}
else
{
s->drawPreviewIcon( p, QSize( static_cast< int >( std::round( width * dotsPerMM ) ), static_cast< int >( std::round( height * dotsPerMM ) ) ), context, false, nullptr, &patchShape );
}
if ( !mTextOnSymbolLabel.isEmpty() )
{
QFontMetricsF fm( mTextOnSymbolTextFormat.scaledFont( *context ) );
qreal yBaselineVCenter = ( height * dotsPerMM + fm.ascent() - fm.descent() ) / 2;
QgsTextRenderer::drawText( QPointF( width * dotsPerMM / 2, yBaselineVCenter ), 0, QgsTextRenderer::AlignCenter,
QStringList() << mTextOnSymbolLabel, *context, mTextOnSymbolTextFormat );
}
}
return QSizeF( std::max( width + 2 * widthOffset, static_cast< double >( desiredWidth ) ),
std::max( height + 2 * heightOffset, static_cast< double >( desiredHeight ) ) );
}
QJsonObject QgsSymbolLegendNode::exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const
{
const QgsSymbol *s = mCustomSymbol ? mCustomSymbol.get() : mItem.symbol();
if ( !s )
{
return QJsonObject();
}
QgsRenderContext ctx;
// QGIS 4.0 - use render context directly here, and note in the dox that the context must be correctly setup
Q_NOWARN_DEPRECATED_PUSH
ctx.setScaleFactor( settings.dpi() / 25.4 );
ctx.setRendererScale( settings.mapScale() );
ctx.setMapToPixel( QgsMapToPixel( 1 / ( settings.mmPerMapUnit() * ctx.scaleFactor() ) ) );
ctx.setForceVectorOutput( true );
ctx.setFlag( QgsRenderContext::Antialiasing, context.flags() & QgsRenderContext::Antialiasing );
ctx.setFlag( QgsRenderContext::LosslessImageRendering, context.flags() & QgsRenderContext::LosslessImageRendering );
Q_NOWARN_DEPRECATED_POP
// ensure that a minimal expression context is available
QgsExpressionContext expContext = context.expressionContext();
expContext.appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( nullptr ) );
ctx.setExpressionContext( expContext );
const QPixmap pix = QgsSymbolLayerUtils::symbolPreviewPixmap( mItem.symbol(), minimumIconSize(), 0, &ctx );
QImage img( pix.toImage().convertToFormat( QImage::Format_ARGB32_Premultiplied ) );
int opacity = 255;
if ( QgsMapLayer *layer = layerNode()->layer() )
opacity = ( 255 * layer->opacity() );
if ( opacity != 255 )
{
QPainter painter;
painter.begin( &img );
painter.setCompositionMode( QPainter::CompositionMode_DestinationIn );
painter.fillRect( pix.rect(), QColor( 0, 0, 0, opacity ) );
painter.end();
}
QByteArray byteArray;
QBuffer buffer( &byteArray );
img.save( &buffer, "PNG" );
const QString base64 = QString::fromLatin1( byteArray.toBase64().data() );
QJsonObject json;
json[ QStringLiteral( "icon" ) ] = base64;
if ( mItem.scaleMaxDenom() > 0 )
{
json[ QStringLiteral( "scaleMaxDenom" ) ] = mItem.scaleMaxDenom();
}
if ( mItem.scaleMinDenom() > 0 )
{
json[ QStringLiteral( "scaleMinDenom" ) ] = mItem.scaleMinDenom();
}
mItem.scaleMaxDenom();
return json;
}
void QgsSymbolLegendNode::setEmbeddedInParent( bool embedded )
{
QgsLayerTreeModelLegendNode::setEmbeddedInParent( embedded );
updateLabel();
}
void QgsSymbolLegendNode::invalidateMapBasedData()
{
if ( mSymbolUsesMapUnits )
{
mPixmap = QPixmap();
emit dataChanged();
}
}
void QgsSymbolLegendNode::updateLabel()
{
if ( !mLayerNode )
return;
bool showFeatureCount = mLayerNode->customProperty( QStringLiteral( "showFeatureCount" ), 0 ).toBool();
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
mLabel = symbolLabel();
if ( showFeatureCount && vl )
{
qlonglong count = mEmbeddedInParent ? vl->featureCount() : vl->featureCount( mItem.ruleKey() ) ;
mLabel += QStringLiteral( " [%1]" ).arg( count != -1 ? QLocale().toString( count ) : tr( "N/A" ) );
}
emit dataChanged();
}
QString QgsSymbolLegendNode::evaluateLabel( const QgsExpressionContext &context, const QString &label )
{
if ( !mLayerNode )
return QString();
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
if ( vl )
{
QgsExpressionContext contextCopy = QgsExpressionContext( context );
QgsExpressionContextScope *symbolScope = createSymbolScope();
contextCopy.appendScope( symbolScope );
contextCopy.appendScope( vl->createExpressionContextScope() );
if ( label.isEmpty() )
{
if ( ! mLayerNode->labelExpression().isEmpty() )
mLabel = QgsExpression::replaceExpressionText( "[%" + mLayerNode->labelExpression() + "%]", &contextCopy );
else if ( mLabel.contains( "[%" ) )
{
const QString symLabel = symbolLabel();
mLabel = QgsExpression::replaceExpressionText( symLabel, &contextCopy );
}
return mLabel;
}
else
{
QString eLabel;
if ( ! mLayerNode->labelExpression().isEmpty() )
eLabel = QgsExpression::replaceExpressionText( label + "[%" + mLayerNode->labelExpression() + "%]", &contextCopy );
else if ( label.contains( "[%" ) )
eLabel = QgsExpression::replaceExpressionText( label, &contextCopy );
return eLabel;
}
}
return mLabel;
}
QgsExpressionContextScope *QgsSymbolLegendNode::createSymbolScope() const
{
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
QgsExpressionContextScope *scope = new QgsExpressionContextScope( tr( "Symbol scope" ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "symbol_label" ), symbolLabel().remove( "[%" ).remove( "%]" ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "symbol_id" ), mItem.ruleKey(), true ) );
if ( vl )
{
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "symbol_count" ), QVariant::fromValue( vl->featureCount( mItem.ruleKey() ) ), true ) );
}
return scope;
}
// -------------------------------------------------------------------------
QgsSimpleLegendNode::QgsSimpleLegendNode( QgsLayerTreeLayer *nodeLayer, const QString &label, const QIcon &icon, QObject *parent, const QString &key )
: QgsLayerTreeModelLegendNode( nodeLayer, parent )
, mLabel( label )
, mIcon( icon )
, mKey( key )
{
}
QVariant QgsSimpleLegendNode::data( int role ) const
{
if ( role == Qt::DisplayRole || role == Qt::EditRole )
return mUserLabel.isEmpty() ? mLabel : mUserLabel;
else if ( role == Qt::DecorationRole )
return mIcon;
else if ( role == RuleKeyRole && !mKey.isEmpty() )
return mKey;
else if ( role == QgsLayerTreeModelLegendNode::NodeTypeRole )
return QgsLayerTreeModelLegendNode::SimpleLegend;
else
return QVariant();
}
// -------------------------------------------------------------------------
QgsImageLegendNode::QgsImageLegendNode( QgsLayerTreeLayer *nodeLayer, const QImage &img, QObject *parent )
: QgsLayerTreeModelLegendNode( nodeLayer, parent )
, mImage( img )
{
}
QVariant QgsImageLegendNode::data( int role ) const
{
if ( role == Qt::DecorationRole )
{
return QPixmap::fromImage( mImage );
}
else if ( role == Qt::SizeHintRole )
{
return mImage.size();
}
else if ( role == QgsLayerTreeModelLegendNode::NodeTypeRole )
{
return QgsLayerTreeModelLegendNode::ImageLegend;
}
return QVariant();
}
QSizeF QgsImageLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const
{
Q_UNUSED( itemHeight )
if ( ctx && ctx->painter )
{
switch ( settings.symbolAlignment() )
{
case Qt::AlignLeft:
default:
ctx->painter->drawImage( QRectF( ctx->columnLeft, ctx->top, settings.wmsLegendSize().width(), settings.wmsLegendSize().height() ),
mImage, QRectF( 0, 0, mImage.width(), mImage.height() ) );
break;
case Qt::AlignRight:
ctx->painter->drawImage( QRectF( ctx->columnRight - settings.wmsLegendSize().width(), ctx->top, settings.wmsLegendSize().width(), settings.wmsLegendSize().height() ),
mImage, QRectF( 0, 0, mImage.width(), mImage.height() ) );
break;
}
}
return settings.wmsLegendSize();
}
QJsonObject QgsImageLegendNode::exportSymbolToJson( const QgsLegendSettings &, const QgsRenderContext & ) const
{
QByteArray byteArray;
QBuffer buffer( &byteArray );
mImage.save( &buffer, "PNG" );
const QString base64 = QString::fromLatin1( byteArray.toBase64().data() );
QJsonObject json;
json[ QStringLiteral( "icon" ) ] = base64;
return json;
}
// -------------------------------------------------------------------------
QgsRasterSymbolLegendNode::QgsRasterSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QColor &color, const QString &label, QObject *parent, bool isCheckable, const QString &ruleKey )
: QgsLayerTreeModelLegendNode( nodeLayer, parent )
, mColor( color )
, mLabel( label )
, mCheckable( isCheckable )
, mRuleKey( ruleKey )
{
}
Qt::ItemFlags QgsRasterSymbolLegendNode::flags() const
{
if ( mCheckable )
return Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
else
return Qt::ItemIsEnabled;
}
QVariant QgsRasterSymbolLegendNode::data( int role ) const
{