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| 1 | +/*************************************************************************** |
| 2 | + qgsvectorlayerlegendwidget.cpp |
| 3 | + --------------------- |
| 4 | + Date : April 2018 |
| 5 | + Copyright : (C) 2018 by Martin Dobias |
| 6 | + Email : wonder dot sk at gmail dot com |
| 7 | + *************************************************************************** |
| 8 | + * * |
| 9 | + * This program is free software; you can redistribute it and/or modify * |
| 10 | + * it under the terms of the GNU General Public License as published by * |
| 11 | + * the Free Software Foundation; either version 2 of the License, or * |
| 12 | + * (at your option) any later version. * |
| 13 | + * * |
| 14 | + ***************************************************************************/ |
| 15 | + |
| 16 | +#include "qgsvectorlayerlegendwidget.h" |
| 17 | + |
| 18 | +#include <QBoxLayout> |
| 19 | +#include <QStandardItemModel> |
| 20 | +#include <QTreeView> |
| 21 | + |
| 22 | +#include "qgsexpressionbuilderdialog.h" |
| 23 | +#include "qgsmapcanvas.h" |
| 24 | +#include "qgsmaplayerlegend.h" |
| 25 | +#include "qgsrenderer.h" |
| 26 | +#include "qgssymbollayerutils.h" |
| 27 | +#include "qgstextformatwidget.h" |
| 28 | +#include "qgsvectorlayer.h" |
| 29 | + |
| 30 | + |
| 31 | +QgsVectorLayerLegendWidget::QgsVectorLayerLegendWidget( QWidget *parent ) |
| 32 | + : QWidget( parent ) |
| 33 | +{ |
| 34 | + mLegendTreeView = new QTreeView; |
| 35 | + mLegendTreeView->setRootIsDecorated( false ); |
| 36 | + |
| 37 | + mTextOnSymbolFormatButton = new QPushButton( tr( "Set Text Format…" ) ); |
| 38 | + connect( mTextOnSymbolFormatButton, &QPushButton::clicked, this, &QgsVectorLayerLegendWidget::openTextFormatWidget ); |
| 39 | + |
| 40 | + mTextOnSymbolFromExpressionButton = new QPushButton( tr( "Set Labels from Expression…" ) ); |
| 41 | + connect( mTextOnSymbolFromExpressionButton, &QPushButton::clicked, this, &QgsVectorLayerLegendWidget::labelsFromExpression ); |
| 42 | + |
| 43 | + mTextOnSymbolGroupBox = new QgsCollapsibleGroupBox; |
| 44 | + |
| 45 | + QHBoxLayout *buttonsLayout = new QHBoxLayout; |
| 46 | + buttonsLayout->addWidget( mTextOnSymbolFormatButton ); |
| 47 | + buttonsLayout->addWidget( mTextOnSymbolFromExpressionButton ); |
| 48 | + |
| 49 | + QVBoxLayout *groupLayout = new QVBoxLayout; |
| 50 | + groupLayout->addWidget( mLegendTreeView ); |
| 51 | + groupLayout->addLayout( buttonsLayout ); |
| 52 | + |
| 53 | + mTextOnSymbolGroupBox->setTitle( tr( "Text on Symbols" ) ); |
| 54 | + mTextOnSymbolGroupBox->setCheckable( true ); |
| 55 | + mTextOnSymbolGroupBox->setLayout( groupLayout ); |
| 56 | + mTextOnSymbolGroupBox->setCollapsed( true ); |
| 57 | + |
| 58 | + QVBoxLayout *layout = new QVBoxLayout; |
| 59 | + layout->addWidget( mTextOnSymbolGroupBox ); |
| 60 | + setLayout( layout ); |
| 61 | +} |
| 62 | + |
| 63 | + |
| 64 | +void QgsVectorLayerLegendWidget::setLayer( QgsVectorLayer *layer ) |
| 65 | +{ |
| 66 | + mLayer = layer; |
| 67 | + |
| 68 | + QgsDefaultVectorLayerLegend *legend = qobject_cast<QgsDefaultVectorLayerLegend *>( layer->legend() ); |
| 69 | + if ( !legend ) |
| 70 | + return; |
| 71 | + |
| 72 | + mTextOnSymbolGroupBox->setChecked( legend->textOnSymbolEnabled() ); |
| 73 | + mTextOnSymbolTextFormat = legend->textOnSymbolTextFormat(); |
| 74 | + populateLegendTreeView( legend->textOnSymbolContent() ); |
| 75 | +} |
| 76 | + |
| 77 | + |
| 78 | +void QgsVectorLayerLegendWidget::populateLegendTreeView( const QHash<QString, QString> &content ) |
| 79 | +{ |
| 80 | + QStandardItemModel *model = new QStandardItemModel; |
| 81 | + model->setColumnCount( 2 ); |
| 82 | + model->setHorizontalHeaderLabels( QStringList() << tr( "Symbol" ) << tr( "Text" ) ); |
| 83 | + |
| 84 | + const QgsLegendSymbolList lst = mLayer->renderer()->legendSymbolItems(); |
| 85 | + for ( const QgsLegendSymbolItem &symbolItem : lst ) |
| 86 | + { |
| 87 | + if ( !symbolItem.symbol() ) |
| 88 | + continue; |
| 89 | + |
| 90 | + QgsRenderContext context; |
| 91 | + QSize iconSize( 16, 16 ); |
| 92 | + QIcon icon = QgsSymbolLayerUtils::symbolPreviewPixmap( symbolItem.symbol(), iconSize, 0, &context ); |
| 93 | + |
| 94 | + QStandardItem *item1 = new QStandardItem( icon, symbolItem.label() ); |
| 95 | + item1->setEditable( false ); |
| 96 | + QStandardItem *item2 = new QStandardItem; |
| 97 | + if ( symbolItem.ruleKey().isEmpty() ) |
| 98 | + { |
| 99 | + item1->setEnabled( false ); |
| 100 | + item2->setEnabled( true ); |
| 101 | + } |
| 102 | + else |
| 103 | + { |
| 104 | + item1->setData( symbolItem.ruleKey() ); |
| 105 | + if ( content.contains( symbolItem.ruleKey() ) ) |
| 106 | + item2->setText( content.value( symbolItem.ruleKey() ) ); |
| 107 | + } |
| 108 | + model->appendRow( QList<QStandardItem *>() << item1 << item2 ); |
| 109 | + } |
| 110 | + mLegendTreeView->setModel( model ); |
| 111 | + mLegendTreeView->resizeColumnToContents( 0 ); |
| 112 | +} |
| 113 | + |
| 114 | + |
| 115 | +void QgsVectorLayerLegendWidget::applyToLayer() |
| 116 | +{ |
| 117 | + QgsDefaultVectorLayerLegend *legend = new QgsDefaultVectorLayerLegend( mLayer ); |
| 118 | + legend->setTextOnSymbolEnabled( mTextOnSymbolGroupBox->isChecked() ); |
| 119 | + legend->setTextOnSymbolTextFormat( mTextOnSymbolTextFormat ); |
| 120 | + |
| 121 | + QHash<QString, QString> content; |
| 122 | + if ( QStandardItemModel *model = qobject_cast<QStandardItemModel *>( mLegendTreeView->model() ) ) |
| 123 | + { |
| 124 | + for ( int i = 0; i < model->rowCount(); ++i ) |
| 125 | + { |
| 126 | + QString ruleKey = model->item( i, 0 )->data().toString(); |
| 127 | + QString label = model->item( i, 1 )->text(); |
| 128 | + if ( !label.isEmpty() ) |
| 129 | + content[ruleKey] = label; |
| 130 | + } |
| 131 | + } |
| 132 | + legend->setTextOnSymbolContent( content ); |
| 133 | + |
| 134 | + mLayer->setLegend( legend ); |
| 135 | +} |
| 136 | + |
| 137 | + |
| 138 | +void QgsVectorLayerLegendWidget::openTextFormatWidget() |
| 139 | +{ |
| 140 | + QgsTextFormatWidget *textOnSymbolFormatWidget = new QgsTextFormatWidget( mTextOnSymbolTextFormat ); |
| 141 | + QDialogButtonBox *dialogButtonBox = new QDialogButtonBox( QDialogButtonBox::Ok | QDialogButtonBox::Cancel ); |
| 142 | + QVBoxLayout *layout = new QVBoxLayout; |
| 143 | + layout->addWidget( textOnSymbolFormatWidget ); |
| 144 | + layout->addWidget( dialogButtonBox ); |
| 145 | + QDialog dlg; |
| 146 | + connect( dialogButtonBox, &QDialogButtonBox::accepted, &dlg, &QDialog::accept ); |
| 147 | + connect( dialogButtonBox, &QDialogButtonBox::rejected, &dlg, &QDialog::reject ); |
| 148 | + dlg.setLayout( layout ); |
| 149 | + if ( !dlg.exec() ) |
| 150 | + return; |
| 151 | + |
| 152 | + mTextOnSymbolTextFormat = textOnSymbolFormatWidget->format(); |
| 153 | +} |
| 154 | + |
| 155 | + |
| 156 | +void QgsVectorLayerLegendWidget::labelsFromExpression() |
| 157 | +{ |
| 158 | + QHash<QString, QString> content; |
| 159 | + QgsRenderContext context( QgsRenderContext::fromMapSettings( mCanvas->mapSettings() ) ); |
| 160 | + |
| 161 | + QgsExpressionBuilderDialog dlgExpression( mLayer ); |
| 162 | + dlgExpression.setExpressionContext( context.expressionContext() ); |
| 163 | + if ( !dlgExpression.exec() ) |
| 164 | + return; |
| 165 | + |
| 166 | + QgsExpression expr( dlgExpression.expressionText() ); |
| 167 | + expr.prepare( &context.expressionContext() ); |
| 168 | + |
| 169 | + std::unique_ptr< QgsFeatureRenderer > r( mLayer->renderer()->clone() ); |
| 170 | + |
| 171 | + QgsFeature f; |
| 172 | + QgsFeatureRequest request; |
| 173 | + request.setSubsetOfAttributes( r->usedAttributes( context ), mLayer->fields() ); |
| 174 | + QgsFeatureIterator fi = mLayer->getFeatures(); |
| 175 | + |
| 176 | + r->startRender( context, mLayer->fields() ); |
| 177 | + while ( fi.nextFeature( f ) ) |
| 178 | + { |
| 179 | + context.expressionContext().setFeature( f ); |
| 180 | + const QSet<QString> keys = r->legendKeysForFeature( f, context ); |
| 181 | + for ( const QString &key : keys ) |
| 182 | + { |
| 183 | + if ( content.contains( key ) ) |
| 184 | + continue; |
| 185 | + |
| 186 | + QString label = expr.evaluate( &context.expressionContext() ).toString(); |
| 187 | + if ( !label.isEmpty() ) |
| 188 | + content[key] = label; |
| 189 | + } |
| 190 | + } |
| 191 | + r->stopRender( context ); |
| 192 | + |
| 193 | + populateLegendTreeView( content ); |
| 194 | +} |
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