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qgsexpressionbuilderwidget.cpp
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qgsexpressionbuilderwidget.cpp
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/***************************************************************************
qgisexpressionbuilderwidget.cpp - A generic expression string builder widget.
--------------------------------------
Date : 29-May-2011
Copyright : (C) 2011 by Nathan Woodrow
Email : woodrow.nathan 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. *
* *
***************************************************************************/
#include "qgsexpressionbuilderwidget.h"
#include "qgslogger.h"
#include "qgsexpression.h"
#include "qgsexpressionfunction.h"
#include "qgsexpressionnodeimpl.h"
#include "qgsmessageviewer.h"
#include "qgsapplication.h"
#include "qgspythonrunner.h"
#include "qgsgeometry.h"
#include "qgsfeature.h"
#include "qgsfeatureiterator.h"
#include "qgsvectorlayer.h"
#include "qgssettings.h"
#include "qgsproject.h"
#include "qgsrelationmanager.h"
#include "qgsrelation.h"
#include "qgsexpressioncontextutils.h"
#include "qgsfieldformatterregistry.h"
#include "qgsfieldformatter.h"
#include "qgsexpressionstoredialog.h"
#include <QMenu>
#include <QFile>
#include <QTextStream>
#include <QDir>
#include <QInputDialog>
#include <QComboBox>
#include <QGraphicsOpacityEffect>
#include <QPropertyAnimation>
#include <QMessageBox>
#include <QVersionNumber>
#include <QDateTime>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QFileDialog>
QgsExpressionBuilderWidget::QgsExpressionBuilderWidget( QWidget *parent )
: QWidget( parent )
, mProject( QgsProject::instance() )
{
setupUi( this );
connect( btnRun, &QToolButton::pressed, this, &QgsExpressionBuilderWidget::btnRun_pressed );
connect( btnNewFile, &QToolButton::pressed, this, &QgsExpressionBuilderWidget::btnNewFile_pressed );
connect( cmbFileNames, &QListWidget::currentItemChanged, this, &QgsExpressionBuilderWidget::cmbFileNames_currentItemChanged );
connect( expressionTree, &QTreeView::doubleClicked, this, &QgsExpressionBuilderWidget::expressionTree_doubleClicked );
connect( txtExpressionString, &QgsCodeEditorExpression::textChanged, this, &QgsExpressionBuilderWidget::txtExpressionString_textChanged );
connect( txtPython, &QgsCodeEditorPython::textChanged, this, &QgsExpressionBuilderWidget::txtPython_textChanged );
connect( txtSearchEditValues, &QgsFilterLineEdit::textChanged, this, &QgsExpressionBuilderWidget::txtSearchEditValues_textChanged );
connect( txtSearchEdit, &QgsFilterLineEdit::textChanged, this, &QgsExpressionBuilderWidget::txtSearchEdit_textChanged );
connect( lblPreview, &QLabel::linkActivated, this, &QgsExpressionBuilderWidget::lblPreview_linkActivated );
connect( mValuesListView, &QListView::doubleClicked, this, &QgsExpressionBuilderWidget::mValuesListView_doubleClicked );
connect( btnSaveExpression, &QPushButton::pressed, this, &QgsExpressionBuilderWidget::storeCurrentUserExpression );
connect( btnEditExpression, &QPushButton::pressed, this, &QgsExpressionBuilderWidget::editSelectedUserExpression );
connect( btnRemoveExpression, &QPushButton::pressed, this, &QgsExpressionBuilderWidget::removeSelectedUserExpression );
connect( mActionImportUserExpressions, &QAction::triggered, this, &QgsExpressionBuilderWidget::importUserExpressions_pressed );
connect( mActionExportUserExpressions, &QAction::triggered, this, &QgsExpressionBuilderWidget::exportUserExpressions_pressed );
connect( btnClearEditor, &QPushButton::pressed, txtExpressionString, &QgsCodeEditorExpression::clear );
txtHelpText->setOpenExternalLinks( true );
mValueGroupBox->hide();
// highlighter = new QgsExpressionHighlighter( txtExpressionString->document() );
mModel = qgis::make_unique<QStandardItemModel>();
mProxyModel = qgis::make_unique<QgsExpressionItemSearchProxy>();
mProxyModel->setDynamicSortFilter( true );
mProxyModel->setSourceModel( mModel.get() );
expressionTree->setModel( mProxyModel.get() );
expressionTree->setSortingEnabled( true );
expressionTree->sortByColumn( 0, Qt::AscendingOrder );
expressionTree->setSelectionMode( QAbstractItemView::SelectionMode::SingleSelection );
// Note: must be in sync with the json help file for UserGroup
mUserExpressionsGroupName = QgsExpression::group( QStringLiteral( "UserGroup" ) );
// Set icons for tool buttons
btnSaveExpression->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionFileSave.svg" ) ) );
btnEditExpression->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionToggleEditing.svg" ) ) );
btnRemoveExpression->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionDeleteSelected.svg" ) ) );
btnImportExportExpressions->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionFileSaveAs.svg" ) ) );
btnClearEditor->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionFileNew.svg" ) ) );
expressionTree->setContextMenuPolicy( Qt::CustomContextMenu );
connect( this, &QgsExpressionBuilderWidget::expressionParsed, this, &QgsExpressionBuilderWidget::setExpressionState );
connect( expressionTree, &QWidget::customContextMenuRequested, this, &QgsExpressionBuilderWidget::showContextMenu );
connect( expressionTree->selectionModel(), &QItemSelectionModel::currentChanged,
this, &QgsExpressionBuilderWidget::currentChanged );
connect( btnLoadAll, &QAbstractButton::pressed, this, &QgsExpressionBuilderWidget::loadAllValues );
connect( btnLoadSample, &QAbstractButton::pressed, this, &QgsExpressionBuilderWidget::loadSampleValues );
const auto pushButtons { mOperatorsGroupBox->findChildren<QPushButton *>() };
for ( QPushButton *button : pushButtons )
{
connect( button, &QAbstractButton::pressed, this, &QgsExpressionBuilderWidget::operatorButtonClicked );
}
txtSearchEdit->setShowSearchIcon( true );
txtSearchEdit->setPlaceholderText( tr( "Search…" ) );
mValuesModel = qgis::make_unique<QStandardItemModel>();
mProxyValues = qgis::make_unique<QSortFilterProxyModel>();
mProxyValues->setSourceModel( mValuesModel.get() );
mValuesListView->setModel( mProxyValues.get() );
txtSearchEditValues->setShowSearchIcon( true );
txtSearchEditValues->setPlaceholderText( tr( "Search…" ) );
editorSplit->setSizes( QList<int>( {175, 300} ) );
functionsplit->setCollapsible( 0, false );
connect( mShowHelpButton, &QPushButton::clicked, this, [ = ]()
{
functionsplit->setSizes( QList<int>( {mOperationListGroup->width() - mHelpAndValuesWidget->minimumWidth(),
mHelpAndValuesWidget->minimumWidth()
} ) );
mShowHelpButton->setEnabled( false );
} );
connect( functionsplit, &QSplitter::splitterMoved, this, [ = ]( int, int )
{
mShowHelpButton->setEnabled( functionsplit->sizes().at( 1 ) == 0 );
} );
QgsSettings settings;
splitter->restoreState( settings.value( QStringLiteral( "Windows/QgsExpressionBuilderWidget/splitter" ) ).toByteArray() );
editorSplit->restoreState( settings.value( QStringLiteral( "Windows/QgsExpressionBuilderWidget/editorsplitter" ) ).toByteArray() );
functionsplit->restoreState( settings.value( QStringLiteral( "Windows/QgsExpressionBuilderWidget/functionsplitter" ) ).toByteArray() );
mShowHelpButton->setEnabled( functionsplit->sizes().at( 1 ) == 0 );
txtExpressionString->setFoldingVisible( false );
updateFunctionTree();
loadUserExpressions();
if ( QgsPythonRunner::isValid() )
{
QgsPythonRunner::eval( QStringLiteral( "qgis.user.expressionspath" ), mFunctionsPath );
updateFunctionFileList( mFunctionsPath );
}
else
{
tab_2->hide();
}
// select the first item in the function list
// in order to avoid a blank help widget
QModelIndex firstItem = mProxyModel->index( 0, 0, QModelIndex() );
expressionTree->setCurrentIndex( firstItem );
txtExpressionString->setWrapMode( QsciScintilla::WrapWord );
lblAutoSave->clear();
// Note: If you add a indicator here you should add it to clearErrors method if you need to clear it on text parse.
txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionUnknown );
txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionWrongArgs );
txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionInvalidParams );
txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::FunctionNamedArgsError );
#if defined(QSCINTILLA_VERSION) && QSCINTILLA_VERSION >= 0x20a00
txtExpressionString->indicatorDefine( QgsCodeEditor::TriangleIndicator, QgsExpression::ParserError::Unknown );
#else
txtExpressionString->indicatorDefine( QgsCodeEditor::SquiggleIndicator, QgsExpression::ParserError::Unknown );
#endif
// Set all the error markers as red. -1 is all.
txtExpressionString->setIndicatorForegroundColor( QColor( Qt::red ), -1 );
txtExpressionString->setIndicatorHoverForegroundColor( QColor( Qt::red ), -1 );
txtExpressionString->setIndicatorOutlineColor( QColor( Qt::red ), -1 );
// Hidden function markers.
txtExpressionString->indicatorDefine( QgsCodeEditor::HiddenIndicator, FUNCTION_MARKER_ID );
txtExpressionString->setIndicatorForegroundColor( QColor( Qt::blue ), FUNCTION_MARKER_ID );
txtExpressionString->setIndicatorHoverForegroundColor( QColor( Qt::blue ), FUNCTION_MARKER_ID );
txtExpressionString->setIndicatorHoverStyle( QgsCodeEditor::DotsIndicator, FUNCTION_MARKER_ID );
connect( txtExpressionString, &QgsCodeEditorExpression::indicatorClicked, this, &QgsExpressionBuilderWidget::indicatorClicked );
txtExpressionString->setAutoCompletionCaseSensitivity( true );
txtExpressionString->setAutoCompletionSource( QsciScintilla::AcsAPIs );
txtExpressionString->setCallTipsVisible( 0 );
setExpectedOutputFormat( QString() );
mFunctionBuilderHelp->setMarginVisible( false );
mFunctionBuilderHelp->setEdgeMode( QsciScintilla::EdgeNone );
mFunctionBuilderHelp->setEdgeColumn( 0 );
mFunctionBuilderHelp->setReadOnly( true );
mFunctionBuilderHelp->setText( tr( "\"\"\"Define a new function using the @qgsfunction decorator.\n\
\n\
The function accepts the following parameters\n\
\n\
: param [any]: Define any parameters you want to pass to your function before\n\
the following arguments.\n\
: param feature: The current feature\n\
: param parent: The QgsExpression object\n\
: param context: If there is an argument called ``context`` found at the last\n\
position, this variable will contain a ``QgsExpressionContext``\n\
object, that gives access to various additional information like\n\
expression variables. E.g. ``context.variable( 'layer_id' )``\n\
: returns: The result of the expression.\n\
\n\
\n\
\n\
The @qgsfunction decorator accepts the following arguments:\n\
\n\
\n\
: param args: Defines the number of arguments. With ``args = 'auto'`` the number of\n\
arguments will automatically be extracted from the signature.\n\
With ``args = -1``, any number of arguments are accepted.\n\
: param group: The name of the group under which this expression function will\n\
be listed.\n\
: param handlesnull: Set this to True if your function has custom handling for NULL values.\n\
If False, the result will always be NULL as soon as any parameter is NULL.\n\
Defaults to False.\n\
: param usesgeometry : Set this to True if your function requires access to\n\
feature.geometry(). Defaults to False.\n\
: param referenced_columns: An array of attribute names that are required to run\n\
this function. Defaults to [QgsFeatureRequest.ALL_ATTRIBUTES].\n\
\"\"\"" ) );
}
QgsExpressionBuilderWidget::~QgsExpressionBuilderWidget()
{
QgsSettings settings;
settings.setValue( QStringLiteral( "Windows/QgsExpressionBuilderWidget/splitter" ), splitter->saveState() );
settings.setValue( QStringLiteral( "Windows/QgsExpressionBuilderWidget/editorsplitter" ), editorSplit->saveState() );
settings.setValue( QStringLiteral( "Windows/QgsExpressionBuilderWidget/functionsplitter" ), functionsplit->saveState() );
}
void QgsExpressionBuilderWidget::setLayer( QgsVectorLayer *layer )
{
mLayer = layer;
//TODO - remove existing layer scope from context
if ( mLayer )
mExpressionContext << QgsExpressionContextUtils::layerScope( mLayer );
}
void QgsExpressionBuilderWidget::currentChanged( const QModelIndex &index, const QModelIndex & )
{
txtSearchEditValues->clear();
// Get the item
QModelIndex idx = mProxyModel->mapToSource( index );
QgsExpressionItem *item = dynamic_cast<QgsExpressionItem *>( mModel->itemFromIndex( idx ) );
if ( !item )
return;
bool isField = mLayer && item->getItemType() == QgsExpressionItem::Field;
if ( isField )
{
loadFieldValues( mFieldValues.value( item->text() ) );
cbxValuesInUse->setVisible( formatterCanProvideAvailableValues( item->text() ) );
cbxValuesInUse->setChecked( false );
}
mValueGroupBox->setVisible( isField );
mShowHelpButton->setText( isField ? tr( "Show Values" ) : tr( "Show Help" ) );
// Show the help for the current item.
QString help = loadFunctionHelp( item );
txtHelpText->setText( help );
bool isUserExpression = item->parent() && item->parent()->text() == mUserExpressionsGroupName;
btnRemoveExpression->setEnabled( isUserExpression );
btnEditExpression->setEnabled( isUserExpression );
}
void QgsExpressionBuilderWidget::btnRun_pressed()
{
if ( !cmbFileNames->currentItem() )
return;
QString file = cmbFileNames->currentItem()->text();
saveFunctionFile( file );
runPythonCode( txtPython->text() );
}
void QgsExpressionBuilderWidget::runPythonCode( const QString &code )
{
if ( QgsPythonRunner::isValid() )
{
QString pythontext = code;
QgsPythonRunner::run( pythontext );
}
updateFunctionTree();
loadFieldNames();
loadRecent( mRecentKey );
loadUserExpressions( );
}
void QgsExpressionBuilderWidget::saveFunctionFile( QString fileName )
{
QDir myDir( mFunctionsPath );
if ( !myDir.exists() )
{
myDir.mkpath( mFunctionsPath );
}
if ( !fileName.endsWith( QLatin1String( ".py" ) ) )
{
fileName.append( ".py" );
}
fileName = mFunctionsPath + QDir::separator() + fileName;
QFile myFile( fileName );
if ( myFile.open( QIODevice::WriteOnly | QFile::Truncate ) )
{
QTextStream myFileStream( &myFile );
myFileStream << txtPython->text() << endl;
myFile.close();
}
}
void QgsExpressionBuilderWidget::updateFunctionFileList( const QString &path )
{
mFunctionsPath = path;
QDir dir( path );
dir.setNameFilters( QStringList() << QStringLiteral( "*.py" ) );
QStringList files = dir.entryList( QDir::Files );
cmbFileNames->clear();
const auto constFiles = files;
for ( const QString &name : constFiles )
{
QFileInfo info( mFunctionsPath + QDir::separator() + name );
if ( info.baseName() == QLatin1String( "__init__" ) ) continue;
QListWidgetItem *item = new QListWidgetItem( QgsApplication::getThemeIcon( QStringLiteral( "console/iconTabEditorConsole.svg" ) ), info.baseName() );
cmbFileNames->addItem( item );
}
if ( !cmbFileNames->currentItem() )
{
cmbFileNames->setCurrentRow( 0 );
}
if ( cmbFileNames->count() == 0 )
{
// Create default sample entry.
newFunctionFile( "default" );
txtPython->setText( QString( "'''\n#Sample custom function file\n "
"(uncomment to use and customize or Add button to create a new file) \n%1 \n '''" ).arg( txtPython->text() ) );
saveFunctionFile( "default" );
}
}
void QgsExpressionBuilderWidget::newFunctionFile( const QString &fileName )
{
QList<QListWidgetItem *> items = cmbFileNames->findItems( fileName, Qt::MatchExactly );
if ( !items.isEmpty() )
return;
QListWidgetItem *item = new QListWidgetItem( QgsApplication::getThemeIcon( QStringLiteral( "console/iconTabEditorConsole.svg" ) ), fileName );
cmbFileNames->insertItem( 0, item );
cmbFileNames->setCurrentRow( 0 );
QString templatetxt;
QgsPythonRunner::eval( QStringLiteral( "qgis.user.default_expression_template" ), templatetxt );
txtPython->setText( templatetxt );
saveFunctionFile( fileName );
}
void QgsExpressionBuilderWidget::btnNewFile_pressed()
{
bool ok;
QString text = QInputDialog::getText( this, tr( "New File" ),
tr( "New file name:" ), QLineEdit::Normal,
QString(), &ok );
if ( ok && !text.isEmpty() )
{
newFunctionFile( text );
}
}
void QgsExpressionBuilderWidget::cmbFileNames_currentItemChanged( QListWidgetItem *item, QListWidgetItem *lastitem )
{
if ( lastitem )
{
QString filename = lastitem->text();
saveFunctionFile( filename );
}
QString path = mFunctionsPath + QDir::separator() + item->text();
loadCodeFromFile( path );
}
void QgsExpressionBuilderWidget::loadCodeFromFile( QString path )
{
if ( !path.endsWith( QLatin1String( ".py" ) ) )
path.append( ".py" );
txtPython->loadScript( path );
}
void QgsExpressionBuilderWidget::loadFunctionCode( const QString &code )
{
txtPython->setText( code );
}
void QgsExpressionBuilderWidget::expressionTree_doubleClicked( const QModelIndex &index )
{
QModelIndex idx = mProxyModel->mapToSource( index );
QgsExpressionItem *item = dynamic_cast<QgsExpressionItem *>( mModel->itemFromIndex( idx ) );
if ( !item )
return;
// Don't handle the double-click if we are on a header node.
if ( item->getItemType() == QgsExpressionItem::Header )
return;
// Insert the expression text or replace selected text
txtExpressionString->insertText( item->getExpressionText() );
txtExpressionString->setFocus();
}
void QgsExpressionBuilderWidget::loadFieldNames()
{
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
loadFieldNames( mLayer->fields() );
}
void QgsExpressionBuilderWidget::loadFieldNames( const QgsFields &fields )
{
if ( fields.isEmpty() )
return;
txtExpressionString->setFields( fields );
for ( int i = 0; i < fields.count(); ++i )
{
const QgsField field = fields.at( i );
QIcon icon = fields.iconForField( i );
registerItem( QStringLiteral( "Fields and Values" ), field.displayNameWithAlias(),
" \"" + field.name() + "\" ", QString(), QgsExpressionItem::Field, false, i, icon );
}
}
void QgsExpressionBuilderWidget::loadFieldsAndValues( const QMap<QString, QStringList> &fieldValues )
{
mFieldValues.clear();
QgsFields fields;
for ( auto it = fieldValues.constBegin(); it != fieldValues.constEnd(); ++it )
{
fields.append( QgsField( it.key() ) );
const QStringList values = it.value();
QVariantMap map;
for ( const QString &value : values )
{
map.insert( value, value );
}
mFieldValues.insert( it.key(), map );
}
loadFieldNames( fields );
}
void QgsExpressionBuilderWidget::loadFieldsAndValues( const QMap<QString, QVariantMap> &fieldValues )
{
QgsFields fields;
for ( auto it = fieldValues.constBegin(); it != fieldValues.constEnd(); ++it )
{
fields.append( QgsField( it.key() ) );
}
loadFieldNames( fields );
mFieldValues = fieldValues;
}
void QgsExpressionBuilderWidget::fillFieldValues( const QString &fieldName, int countLimit, bool forceUsedValues )
{
// TODO We should really return a error the user of the widget that
// the there is no layer set.
if ( !mLayer )
return;
// TODO We should thread this so that we don't hold the user up if the layer is massive.
const QgsFields fields = mLayer->fields();
int fieldIndex = fields.lookupField( fieldName );
if ( fieldIndex < 0 )
return;
const QgsEditorWidgetSetup setup = fields.at( fieldIndex ).editorWidgetSetup();
const QgsFieldFormatter *formatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
QVariantList values;
if ( cbxValuesInUse->isVisible() && !cbxValuesInUse->isChecked() && !forceUsedValues )
{
QgsFieldFormatterContext fieldFormatterContext;
fieldFormatterContext.setProject( mProject );
values = formatter->availableValues( setup.config(), countLimit, fieldFormatterContext );
}
else
{
values = mLayer->uniqueValues( fieldIndex, countLimit ).toList();
}
std::sort( values.begin(), values.end() );
mValuesModel->clear();
for ( const QVariant &value : qgis::as_const( values ) )
{
QString strValue;
if ( value.isNull() )
strValue = QStringLiteral( "NULL" );
else if ( value.type() == QVariant::Int || value.type() == QVariant::Double || value.type() == QVariant::LongLong )
strValue = value.toString();
else
strValue = '\'' + value.toString().replace( '\'', QLatin1String( "''" ) ) + '\'';
QString representedValue = formatter->representValue( mLayer, fieldIndex, setup.config(), QVariant(), value );
if ( representedValue != value.toString() )
representedValue = representedValue + QStringLiteral( " [" ) + strValue + ']';
QStandardItem *item = new QStandardItem( representedValue );
item->setData( strValue );
mValuesModel->appendRow( item );
}
}
bool QgsExpressionBuilderWidget::formatterCanProvideAvailableValues( const QString &fieldName )
{
const QgsFields fields = mLayer->fields();
int fieldIndex = fields.lookupField( fieldName );
if ( fieldIndex != -1 )
{
const QgsEditorWidgetSetup setup = fields.at( fieldIndex ).editorWidgetSetup();
const QgsFieldFormatter *formatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
return ( formatter->flags() & QgsFieldFormatter::CanProvideAvailableValues );
}
return false;
}
QString QgsExpressionBuilderWidget::getFunctionHelp( QgsExpressionFunction *function )
{
if ( !function )
return QString();
QString helpContents = QgsExpression::helpText( function->name() );
return QStringLiteral( "<head><style>" ) + helpStylesheet() + QStringLiteral( "</style></head><body>" ) + helpContents + QStringLiteral( "</body>" );
}
void QgsExpressionBuilderWidget::registerItem( const QString &group,
const QString &label,
const QString &expressionText,
const QString &helpText,
QgsExpressionItem::ItemType type, bool highlightedItem, int sortOrder, QIcon icon, const QStringList &tags )
{
QgsExpressionItem *item = new QgsExpressionItem( label, expressionText, helpText, type );
item->setData( label, Qt::UserRole );
item->setData( sortOrder, QgsExpressionItem::CUSTOM_SORT_ROLE );
item->setData( tags, QgsExpressionItem::SEARCH_TAGS_ROLE );
item->setIcon( icon );
// Look up the group and insert the new function.
if ( mExpressionGroups.contains( group ) )
{
QgsExpressionItem *groupNode = mExpressionGroups.value( group );
groupNode->appendRow( item );
}
else
{
// If the group doesn't exist yet we make it first.
QgsExpressionItem *newgroupNode = new QgsExpressionItem( QgsExpression::group( group ), QString(), QgsExpressionItem::Header );
newgroupNode->setData( group, Qt::UserRole );
//Recent group should always be last group
newgroupNode->setData( group.startsWith( QLatin1String( "Recent (" ) ) ? 2 : 1, QgsExpressionItem::CUSTOM_SORT_ROLE );
newgroupNode->appendRow( item );
newgroupNode->setBackground( QBrush( QColor( 238, 238, 238 ) ) );
mModel->appendRow( newgroupNode );
mExpressionGroups.insert( group, newgroupNode );
}
if ( highlightedItem )
{
//insert a copy as a top level item
QgsExpressionItem *topLevelItem = new QgsExpressionItem( label, expressionText, helpText, type );
topLevelItem->setData( label, Qt::UserRole );
item->setData( 0, QgsExpressionItem::CUSTOM_SORT_ROLE );
QFont font = topLevelItem->font();
font.setBold( true );
topLevelItem->setFont( font );
mModel->appendRow( topLevelItem );
}
}
bool QgsExpressionBuilderWidget::isExpressionValid()
{
return mExpressionValid;
}
void QgsExpressionBuilderWidget::saveToRecent( const QString &collection )
{
QgsSettings settings;
QString location = QStringLiteral( "/expressions/recent/%1" ).arg( collection );
QStringList expressions = settings.value( location ).toStringList();
expressions.removeAll( this->expressionText() );
expressions.prepend( this->expressionText() );
while ( expressions.count() > 20 )
{
expressions.pop_back();
}
settings.setValue( location, expressions );
loadRecent( collection );
}
void QgsExpressionBuilderWidget::loadRecent( const QString &collection )
{
mRecentKey = collection;
QString name = tr( "Recent (%1)" ).arg( collection );
if ( mExpressionGroups.contains( name ) )
{
QgsExpressionItem *node = mExpressionGroups.value( name );
node->removeRows( 0, node->rowCount() );
}
QgsSettings settings;
const QString location = QStringLiteral( "/expressions/recent/%1" ).arg( collection );
const QStringList expressions = settings.value( location ).toStringList();
int i = 0;
for ( const QString &expression : expressions )
{
QString help = formatRecentExpressionHelp( expression, expression );
registerItem( name, expression, expression, help, QgsExpressionItem::ExpressionNode, false, i );
i++;
}
}
// this is potentially very slow if there are thousands of user expressions, every time entire cleanup and load
void QgsExpressionBuilderWidget::loadUserExpressions( )
{
// Cleanup
if ( mExpressionGroups.contains( QStringLiteral( "UserGroup" ) ) )
{
QgsExpressionItem *node = mExpressionGroups.value( QStringLiteral( "UserGroup" ) );
node->removeRows( 0, node->rowCount() );
}
QgsSettings settings;
const QString location = QStringLiteral( "user" );
settings.beginGroup( location, QgsSettings::Section::Expressions );
QString label;
QString helpText;
QString expression;
int i = 0;
mUserExpressionLabels = settings.childGroups();
for ( const auto &label : qgis::as_const( mUserExpressionLabels ) )
{
settings.beginGroup( label );
expression = settings.value( QStringLiteral( "expression" ) ).toString();
helpText = formatUserExpressionHelp( label, expression, settings.value( QStringLiteral( "helpText" ) ).toString() );
registerItem( QStringLiteral( "UserGroup" ), label, expression, helpText, QgsExpressionItem::ExpressionNode, false, i++ );
settings.endGroup();
}
}
void QgsExpressionBuilderWidget::saveToUserExpressions( const QString &label, const QString expression, const QString &helpText )
{
QgsSettings settings;
const QString location = QStringLiteral( "user" );
settings.beginGroup( location, QgsSettings::Section::Expressions );
settings.beginGroup( label );
settings.setValue( QStringLiteral( "expression" ), expression );
settings.setValue( QStringLiteral( "helpText" ), helpText );
loadUserExpressions( );
// Scroll
const QModelIndexList idxs { expressionTree->model()->match( expressionTree->model()->index( 0, 0 ),
Qt::DisplayRole, label, 1,
Qt::MatchFlag::MatchRecursive ) };
if ( ! idxs.isEmpty() )
{
expressionTree->scrollTo( idxs.first() );
}
}
void QgsExpressionBuilderWidget::removeFromUserExpressions( const QString &label )
{
QgsSettings settings;
settings.remove( QStringLiteral( "user/%1" ).arg( label ), QgsSettings::Section::Expressions );
loadUserExpressions( );
}
void QgsExpressionBuilderWidget::loadLayers()
{
if ( !mProject )
return;
QMap<QString, QgsMapLayer *> layers = mProject->mapLayers();
QMap<QString, QgsMapLayer *>::const_iterator layerIt = layers.constBegin();
for ( ; layerIt != layers.constEnd(); ++layerIt )
{
registerItemForAllGroups( QStringList() << tr( "Map Layers" ), layerIt.value()->name(), QStringLiteral( "'%1'" ).arg( layerIt.key() ), formatLayerHelp( layerIt.value() ) );
}
}
void QgsExpressionBuilderWidget::loadRelations()
{
if ( !mProject )
return;
QMap<QString, QgsRelation> relations = mProject->relationManager()->relations();
QMap<QString, QgsRelation>::const_iterator relIt = relations.constBegin();
for ( ; relIt != relations.constEnd(); ++relIt )
{
registerItemForAllGroups( QStringList() << tr( "Relations" ), relIt->name(), QStringLiteral( "'%1'" ).arg( relIt->id() ), formatRelationHelp( relIt.value() ) );
}
}
void QgsExpressionBuilderWidget::updateFunctionTree()
{
mModel->clear();
mExpressionGroups.clear();
// TODO Can we move this stuff to QgsExpression, like the functions?
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "+" ), QStringLiteral( " + " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "-" ), QStringLiteral( " - " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "*" ), QStringLiteral( " * " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "/" ), QStringLiteral( " / " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "%" ), QStringLiteral( " % " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "^" ), QStringLiteral( " ^ " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "=" ), QStringLiteral( " = " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "~" ), QStringLiteral( " ~ " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( ">" ), QStringLiteral( " > " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "<" ), QStringLiteral( " < " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "<>" ), QStringLiteral( " <> " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "<=" ), QStringLiteral( " <= " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( ">=" ), QStringLiteral( " >= " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "[]" ), QStringLiteral( "[ ]" ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "||" ), QStringLiteral( " || " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "IN" ), QStringLiteral( " IN " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "LIKE" ), QStringLiteral( " LIKE " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "ILIKE" ), QStringLiteral( " ILIKE " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "IS" ), QStringLiteral( " IS " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "OR" ), QStringLiteral( " OR " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "AND" ), QStringLiteral( " AND " ) );
registerItem( QStringLiteral( "Operators" ), QStringLiteral( "NOT" ), QStringLiteral( " NOT " ) );
QString casestring = QStringLiteral( "CASE WHEN condition THEN result END" );
registerItem( QStringLiteral( "Conditionals" ), QStringLiteral( "CASE" ), casestring );
// use -1 as sort order here -- NULL should always show before the field list
registerItem( QStringLiteral( "Fields and Values" ), QStringLiteral( "NULL" ), QStringLiteral( "NULL" ), QString(), QgsExpressionItem::ExpressionNode, false, -1 );
// Load the functions from the QgsExpression class
int count = QgsExpression::functionCount();
for ( int i = 0; i < count; i++ )
{
QgsExpressionFunction *func = QgsExpression::Functions()[i];
QString name = func->name();
if ( name.startsWith( '_' ) ) // do not display private functions
continue;
if ( func->isDeprecated() ) // don't show deprecated functions
continue;
if ( func->isContextual() )
{
//don't show contextual functions by default - it's up the the QgsExpressionContext
//object to provide them if supported
continue;
}
if ( func->params() != 0 )
name += '(';
else if ( !name.startsWith( '$' ) )
name += QLatin1String( "()" );
// this is where the functions are being registered, including functions under "Custom"
registerItemForAllGroups( func->groups(), func->name(), ' ' + name + ' ', func->helpText(), QgsExpressionItem::ExpressionNode, mExpressionContext.isHighlightedFunction( func->name() ), 1, QgsExpression::tags( func->name() ) );
}
// load relation names
loadRelations();
// load layer IDs
loadLayers();
loadExpressionContext();
}
void QgsExpressionBuilderWidget::setGeomCalculator( const QgsDistanceArea &da )
{
mDa = da;
}
QString QgsExpressionBuilderWidget::expressionText()
{
return txtExpressionString->text();
}
void QgsExpressionBuilderWidget::setExpressionText( const QString &expression )
{
txtExpressionString->setText( expression );
}
QString QgsExpressionBuilderWidget::expectedOutputFormat()
{
return lblExpected->text();
}
void QgsExpressionBuilderWidget::setExpectedOutputFormat( const QString &expected )
{
lblExpected->setText( expected );
mExpectedOutputFrame->setVisible( !expected.isNull() );
}
void QgsExpressionBuilderWidget::setExpressionContext( const QgsExpressionContext &context )
{
mExpressionContext = context;
updateFunctionTree();
loadFieldNames();
loadRecent( mRecentKey );
loadUserExpressions( );
}
void QgsExpressionBuilderWidget::txtExpressionString_textChanged()
{
QString text = expressionText();
clearErrors();
btnClearEditor->setEnabled( ! txtExpressionString->text().isEmpty() );
btnSaveExpression->setEnabled( false );
// If the string is empty the expression will still "fail" although
// we don't show the user an error as it will be confusing.
if ( text.isEmpty() )
{
lblPreview->clear();
lblPreview->setStyleSheet( QString() );
txtExpressionString->setToolTip( QString() );
lblPreview->setToolTip( QString() );
emit expressionParsed( false );
setParserError( true );
setEvalError( true );
return;
}
QgsExpression exp( text );
if ( mLayer )
{
// Only set calculator if we have layer, else use default.
exp.setGeomCalculator( &mDa );
if ( !mExpressionContext.feature().isValid() )
{
// no feature passed yet, try to get from layer
QgsFeature f;
mLayer->getFeatures( QgsFeatureRequest().setLimit( 1 ) ).nextFeature( f );
mExpressionContext.setFeature( f );
}
}
QVariant value = exp.evaluate( &mExpressionContext );
if ( !exp.hasEvalError() )
{
lblPreview->setText( QgsExpression::formatPreviewString( value ) );
}
if ( exp.hasParserError() || exp.hasEvalError() )
{
QString errorString = exp.parserErrorString().replace( "\n", "<br>" );
QString tooltip;
if ( exp.hasParserError() )
tooltip = QStringLiteral( "<b>%1:</b>"
"%2" ).arg( tr( "Parser Errors" ), errorString );
// Only show the eval error if there is no parser error.
if ( !exp.hasParserError() && exp.hasEvalError() )
tooltip += QStringLiteral( "<b>%1:</b> %2" ).arg( tr( "Eval Error" ), exp.evalErrorString() );
lblPreview->setText( tr( "Expression is invalid <a href=""more"">(more info)</a>" ) );
lblPreview->setStyleSheet( QStringLiteral( "color: rgba(255, 6, 10, 255);" ) );
txtExpressionString->setToolTip( tooltip );
lblPreview->setToolTip( tooltip );
emit expressionParsed( false );
setParserError( exp.hasParserError() );
setEvalError( exp.hasEvalError() );
createErrorMarkers( exp.parserErrors() );
return;
}
else
{
lblPreview->setStyleSheet( QString() );
txtExpressionString->setToolTip( QString() );
lblPreview->setToolTip( QString() );
emit expressionParsed( true );
setParserError( false );
setEvalError( false );
createMarkers( exp.rootNode() );
btnSaveExpression->setEnabled( true );
}
}
void QgsExpressionBuilderWidget::loadExpressionContext()
{
txtExpressionString->setExpressionContext( mExpressionContext );
QStringList variableNames = mExpressionContext.filteredVariableNames();
const auto constVariableNames = variableNames;
for ( const QString &variable : constVariableNames )
{
registerItem( QStringLiteral( "Variables" ), variable, " @" + variable + ' ',
formatVariableHelp( variable, mExpressionContext.description( variable ), true, mExpressionContext.variable( variable ) ),
QgsExpressionItem::ExpressionNode,
mExpressionContext.isHighlightedVariable( variable ) );
}
// Load the functions from the expression context
QStringList contextFunctions = mExpressionContext.functionNames();
const auto constContextFunctions = contextFunctions;
for ( const QString &functionName : constContextFunctions )
{
QgsExpressionFunction *func = mExpressionContext.function( functionName );
QString name = func->name();
if ( name.startsWith( '_' ) ) // do not display private functions
continue;
if ( func->params() != 0 )
name += '(';
registerItemForAllGroups( func->groups(), func->name(), ' ' + name + ' ', func->helpText(), QgsExpressionItem::ExpressionNode, mExpressionContext.isHighlightedFunction( func->name() ), 1, QgsExpression::tags( func->name() ) );
}
}
void QgsExpressionBuilderWidget::registerItemForAllGroups( const QStringList &groups, const QString &label, const QString &expressionText, const QString &helpText, QgsExpressionItem::ItemType type, bool highlightedItem, int sortOrder, const QStringList &tags )
{
const auto constGroups = groups;
for ( const QString &group : constGroups )
{
registerItem( group, label, expressionText, helpText, type, highlightedItem, sortOrder, QIcon(), tags );
}
}
QString QgsExpressionBuilderWidget::formatRelationHelp( const QgsRelation &relation ) const
{
QString text = QStringLiteral( "<h3>%1</h3>\n<div class=\"description\"><p>%2</p></div>" )
.arg( QCoreApplication::translate( "relation_help", "relation %1" ).arg( relation.name() ),
tr( "Inserts the relation ID for the relation named '%1'." ).arg( relation.name() ) );
text += QStringLiteral( "<h4>%1</h4><div class=\"description\"><pre>%2</pre></div>" )
.arg( tr( "Current value" ), relation.id() );
return text;
}
QString QgsExpressionBuilderWidget::formatLayerHelp( const QgsMapLayer *layer ) const
{
QString text = QStringLiteral( "<h3>%1</h3>\n<div class=\"description\"><p>%2</p></div>" )
.arg( QCoreApplication::translate( "layer_help", "map layer %1" ).arg( layer->name() ),
tr( "Inserts the layer ID for the layer named '%1'." ).arg( layer->name() ) );
text += QStringLiteral( "<h4>%1</h4><div class=\"description\"><pre>%2</pre></div>" )
.arg( tr( "Current value" ), layer->id() );
return text;
}
QString QgsExpressionBuilderWidget::formatRecentExpressionHelp( const QString &label, const QString &expression ) const
{
QString text = QStringLiteral( "<h3>%1</h3>\n<div class=\"description\"><p>%2</p></div>" )
.arg( QCoreApplication::translate( "recent_expression_help", "expression %1" ).arg( label ),
QCoreApplication::translate( "recent_expression_help", "Recently used expression." ) );
text += QStringLiteral( "<h4>%1</h4><div class=\"description\"><pre>%2</pre></div>" )
.arg( tr( "Expression" ), expression );
return text;
}
QString QgsExpressionBuilderWidget::formatUserExpressionHelp( const QString &label, const QString &expression, const QString &description ) const
{
QString text = QStringLiteral( "<h3>%1</h3>\n<div class=\"description\"><p>%2</p></div>" )
.arg( QCoreApplication::translate( "user_expression_help", "expression %1" ).arg( label ), description );
text += QStringLiteral( "<h4>%1</h4><div class=\"description\"><pre>%2</pre></div>" )
.arg( tr( "Expression" ), expression );
return text;
}