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| 1 | +/*************************************************************************** |
| 2 | + qgslayertreeviewfilterindicator.cpp |
| 3 | + -------------------------------------- |
| 4 | + Date : January 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 "qgslayertreeviewfilterindicator.h" |
| 17 | + |
| 18 | +#include "qgslayertree.h" |
| 19 | +#include "qgslayertreemodel.h" |
| 20 | +#include "qgslayertreeview.h" |
| 21 | +#include "qgsquerybuilder.h" |
| 22 | +#include "qgsvectorlayer.h" |
| 23 | + |
| 24 | + |
| 25 | +QgsLayerTreeViewFilterIndicatorProvider::QgsLayerTreeViewFilterIndicatorProvider( QgsLayerTreeView *view ) |
| 26 | + : QObject( view ) |
| 27 | + , mLayerTreeView( view ) |
| 28 | +{ |
| 29 | + mIcon = QgsApplication::getThemeIcon( QStringLiteral( "/mActionFilter2.svg" ) ); |
| 30 | + |
| 31 | + QgsLayerTree *tree = mLayerTreeView->layerTreeModel()->rootGroup(); |
| 32 | + onAddedChildren( tree, 0, tree->children().count() - 1 ); |
| 33 | + |
| 34 | + connect( tree, &QgsLayerTree::addedChildren, this, &QgsLayerTreeViewFilterIndicatorProvider::onAddedChildren ); |
| 35 | + connect( tree, &QgsLayerTree::willRemoveChildren, this, &QgsLayerTreeViewFilterIndicatorProvider::onWillRemoveChildren ); |
| 36 | +} |
| 37 | + |
| 38 | + |
| 39 | +void QgsLayerTreeViewFilterIndicatorProvider::onAddedChildren( QgsLayerTreeNode *node, int indexFrom, int indexTo ) |
| 40 | +{ |
| 41 | + // recursively connect to providers' dataChanged() signal |
| 42 | + |
| 43 | + QList<QgsLayerTreeNode *> children = node->children(); |
| 44 | + for ( int i = indexFrom; i <= indexTo; ++i ) |
| 45 | + { |
| 46 | + QgsLayerTreeNode *childNode = children[i]; |
| 47 | + |
| 48 | + if ( QgsLayerTree::isGroup( childNode ) ) |
| 49 | + { |
| 50 | + onAddedChildren( childNode, 0, childNode->children().count() - 1 ); |
| 51 | + } |
| 52 | + else if ( QgsLayerTree::isLayer( childNode ) ) |
| 53 | + { |
| 54 | + QgsLayerTreeLayer *childLayerNode = QgsLayerTree::toLayer( childNode ); |
| 55 | + if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( childLayerNode->layer() ) ) |
| 56 | + { |
| 57 | + if ( vlayer->dataProvider() ) |
| 58 | + { |
| 59 | + connect( vlayer->dataProvider(), &QgsDataProvider::dataChanged, this, &QgsLayerTreeViewFilterIndicatorProvider::onProviderDataChanged ); |
| 60 | + |
| 61 | + addOrRemoveIndicator( childLayerNode, vlayer->dataProvider() ); |
| 62 | + } |
| 63 | + } |
| 64 | + else if ( !childLayerNode->layer() ) |
| 65 | + { |
| 66 | + // wait for layer to be loaded (e.g. when loading project, first the tree is loaded, afterwards the references to layers are resolved) |
| 67 | + connect( childLayerNode, &QgsLayerTreeLayer::layerLoaded, this, &QgsLayerTreeViewFilterIndicatorProvider::onLayerLoaded ); |
| 68 | + } |
| 69 | + } |
| 70 | + } |
| 71 | +} |
| 72 | + |
| 73 | + |
| 74 | +void QgsLayerTreeViewFilterIndicatorProvider::onWillRemoveChildren( QgsLayerTreeNode *node, int indexFrom, int indexTo ) |
| 75 | +{ |
| 76 | + // recursively disconnect from providers' dataChanged() signal |
| 77 | + |
| 78 | + QList<QgsLayerTreeNode *> children = node->children(); |
| 79 | + for ( int i = indexFrom; i <= indexTo; ++i ) |
| 80 | + { |
| 81 | + QgsLayerTreeNode *childNode = children[i]; |
| 82 | + |
| 83 | + if ( QgsLayerTree::isGroup( childNode ) ) |
| 84 | + { |
| 85 | + onWillRemoveChildren( childNode, 0, childNode->children().count() - 1 ); |
| 86 | + } |
| 87 | + else if ( QgsLayerTree::isLayer( childNode ) ) |
| 88 | + { |
| 89 | + QgsLayerTreeLayer *childLayerNode = QgsLayerTree::toLayer( childNode ); |
| 90 | + if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( childLayerNode->layer() ) ) |
| 91 | + { |
| 92 | + if ( vlayer->dataProvider() ) |
| 93 | + disconnect( vlayer->dataProvider(), &QgsDataProvider::dataChanged, this, &QgsLayerTreeViewFilterIndicatorProvider::onProviderDataChanged ); |
| 94 | + } |
| 95 | + } |
| 96 | + } |
| 97 | +} |
| 98 | + |
| 99 | + |
| 100 | +void QgsLayerTreeViewFilterIndicatorProvider::onLayerLoaded() |
| 101 | +{ |
| 102 | + QgsLayerTreeLayer *nodeLayer = qobject_cast<QgsLayerTreeLayer *>( sender() ); |
| 103 | + if ( !nodeLayer ) |
| 104 | + return; |
| 105 | + |
| 106 | + if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( nodeLayer->layer() ) ) |
| 107 | + { |
| 108 | + if ( vlayer->dataProvider() ) |
| 109 | + { |
| 110 | + connect( vlayer->dataProvider(), &QgsDataProvider::dataChanged, this, &QgsLayerTreeViewFilterIndicatorProvider::onProviderDataChanged ); |
| 111 | + |
| 112 | + addOrRemoveIndicator( nodeLayer, vlayer->dataProvider() ); |
| 113 | + } |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | + |
| 118 | +void QgsLayerTreeViewFilterIndicatorProvider::onProviderDataChanged() |
| 119 | +{ |
| 120 | + QgsVectorDataProvider *provider = qobject_cast<QgsVectorDataProvider *>( sender() ); |
| 121 | + if ( !provider ) |
| 122 | + return; |
| 123 | + |
| 124 | + // walk the tree and find layer node that needs to be updated |
| 125 | + const QList<QgsLayerTreeLayer *> layerNodes = mLayerTreeView->layerTreeModel()->rootGroup()->findLayers(); |
| 126 | + for ( QgsLayerTreeLayer *node : layerNodes ) |
| 127 | + { |
| 128 | + if ( node->layer() && node->layer()->dataProvider() == provider ) |
| 129 | + { |
| 130 | + addOrRemoveIndicator( node, provider ); |
| 131 | + break; |
| 132 | + } |
| 133 | + } |
| 134 | +} |
| 135 | + |
| 136 | + |
| 137 | +void QgsLayerTreeViewFilterIndicatorProvider::onIndicatorClicked( const QModelIndex &index ) |
| 138 | +{ |
| 139 | + QgsLayerTreeNode *node = mLayerTreeView->layerTreeModel()->index2node( index ); |
| 140 | + if ( !QgsLayerTree::isLayer( node ) ) |
| 141 | + return; |
| 142 | + |
| 143 | + QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( QgsLayerTree::toLayer( node )->layer() ); |
| 144 | + if ( !vlayer || !vlayer->dataProvider() ) |
| 145 | + return; |
| 146 | + |
| 147 | + // launch the query builder |
| 148 | + QgsQueryBuilder qb( vlayer ); |
| 149 | + qb.setSql( vlayer->dataProvider()->subsetString() ); |
| 150 | + if ( qb.exec() ) |
| 151 | + vlayer->dataProvider()->setSubsetString( qb.sql() ); |
| 152 | +} |
| 153 | + |
| 154 | +QgsLayerTreeViewIndicator *QgsLayerTreeViewFilterIndicatorProvider::newIndicator( const QString &filter ) |
| 155 | +{ |
| 156 | + QgsLayerTreeViewIndicator *indicator = new QgsLayerTreeViewIndicator( this ); |
| 157 | + indicator->setIcon( mIcon ); |
| 158 | + updateIndicator( indicator, filter ); |
| 159 | + connect( indicator, &QgsLayerTreeViewIndicator::clicked, this, &QgsLayerTreeViewFilterIndicatorProvider::onIndicatorClicked ); |
| 160 | + mIndicators.insert( indicator ); |
| 161 | + return indicator; |
| 162 | +} |
| 163 | + |
| 164 | +void QgsLayerTreeViewFilterIndicatorProvider::updateIndicator( QgsLayerTreeViewIndicator *indicator, const QString &filter ) |
| 165 | +{ |
| 166 | + indicator->setToolTip( QString( "<b>%1:</b><br>%2" ).arg( tr( "Filter" ) ).arg( filter ) ); |
| 167 | +} |
| 168 | + |
| 169 | + |
| 170 | +void QgsLayerTreeViewFilterIndicatorProvider::addOrRemoveIndicator( QgsLayerTreeNode *node, QgsVectorDataProvider *provider ) |
| 171 | +{ |
| 172 | + QString filter = provider->subsetString(); |
| 173 | + if ( !filter.isEmpty() ) |
| 174 | + { |
| 175 | + const QList<QgsLayerTreeViewIndicator *> nodeIndicators = mLayerTreeView->indicators( node ); |
| 176 | + |
| 177 | + // maybe the indicator exists already |
| 178 | + foreach ( QgsLayerTreeViewIndicator *indicator, nodeIndicators ) |
| 179 | + { |
| 180 | + if ( mIndicators.contains( indicator ) ) |
| 181 | + { |
| 182 | + updateIndicator( indicator, filter ); |
| 183 | + return; |
| 184 | + } |
| 185 | + } |
| 186 | + |
| 187 | + // it does not exist: need to create a new one |
| 188 | + mLayerTreeView->addIndicator( node, newIndicator( filter ) ); |
| 189 | + } |
| 190 | + else |
| 191 | + { |
| 192 | + const QList<QgsLayerTreeViewIndicator *> nodeIndicators = mLayerTreeView->indicators( node ); |
| 193 | + |
| 194 | + // there may be existing indicator we need to get rid of |
| 195 | + foreach ( QgsLayerTreeViewIndicator *indicator, nodeIndicators ) |
| 196 | + { |
| 197 | + if ( mIndicators.contains( indicator ) ) |
| 198 | + { |
| 199 | + mLayerTreeView->removeIndicator( node, indicator ); |
| 200 | + indicator->deleteLater(); |
| 201 | + return; |
| 202 | + } |
| 203 | + } |
| 204 | + |
| 205 | + // no indicator was there before, nothing to do |
| 206 | + } |
| 207 | +} |
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