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qgsorderbydialog.cpp
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qgsorderbydialog.cpp
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/***************************************************************************
qgosorderbydialog.cpp
---------------------
begin : 20.12.2015
copyright : (C) 2015 by Matthias Kuhn
email : matthias@opengis.ch
***************************************************************************
* *
* 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 "qgsorderbydialog.h"
#include "qgsexpressionbuilderdialog.h"
#include <QTableWidget>
#include <QCheckBox>
#include <QKeyEvent>
QgsOrderByDialog::QgsOrderByDialog( QgsVectorLayer* layer, QWidget* parent )
: QDialog( parent )
, mLayer( layer )
{
setupUi( this );
connect( mOrderByTableWidget, SIGNAL( cellDoubleClicked( int, int ) ), this, SLOT( onCellDoubleClicked( int, int ) ) );
connect( mOrderByTableWidget, SIGNAL( cellChanged( int, int ) ), this, SLOT( onCellChanged( int, int ) ) );
mOrderByTableWidget->horizontalHeader()->setResizeMode( QHeaderView::Stretch );
mOrderByTableWidget->horizontalHeader()->setResizeMode( 1, QHeaderView::Interactive );
mOrderByTableWidget->horizontalHeader()->setResizeMode( 2, QHeaderView::Interactive );
mOrderByTableWidget->installEventFilter( this );
}
void QgsOrderByDialog::setOrderBy( const QgsFeatureRequest::OrderBy& orderBy )
{
mOrderByTableWidget->clear();
mOrderByTableWidget->setRowCount( orderBy.length() + 1 );
int i = 0;
Q_FOREACH ( const QgsFeatureRequest::OrderByClause& orderByClause, orderBy )
{
QTableWidgetItem* expressionItem = new QTableWidgetItem( orderByClause.expression().expression() );
QCheckBox* ascCheckBox = new QCheckBox();
ascCheckBox->setChecked( orderByClause.ascending() );
QCheckBox* nullsFirstCheckBox = new QCheckBox();
nullsFirstCheckBox->setChecked( orderByClause.nullsFirst() );
mOrderByTableWidget->setItem( i, 0, expressionItem );
mOrderByTableWidget->setCellWidget( i, 1, ascCheckBox );
mOrderByTableWidget->setCellWidget( i, 2, nullsFirstCheckBox );
++i;
}
// Add an empty widget at the end
QTableWidgetItem* expressionItem = new QTableWidgetItem( "" );
QCheckBox* ascCheckBox = new QCheckBox();
ascCheckBox->setChecked( true );
QCheckBox* nullsFirstCheckBox = new QCheckBox();
mOrderByTableWidget->setItem( i, 0, expressionItem );
mOrderByTableWidget->setCellWidget( i, 1, ascCheckBox );
mOrderByTableWidget->setCellWidget( i, 2, nullsFirstCheckBox );
}
QgsFeatureRequest::OrderBy QgsOrderByDialog::orderBy()
{
QgsFeatureRequest::OrderBy orderBy;
for ( int i = 0; i < mOrderByTableWidget->rowCount(); ++i )
{
QString expressionText = mOrderByTableWidget->item( i, 0 )->text();
if ( ! expressionText.isEmpty() )
{
bool asc = static_cast<QCheckBox*>( mOrderByTableWidget->cellWidget( i, 1 ) )->checkState();
bool nullsFirst = static_cast<QCheckBox*>( mOrderByTableWidget->cellWidget( i, 2 ) )->checkState();
QgsFeatureRequest::OrderByClause orderByClause( expressionText, asc, nullsFirst );
orderBy << orderByClause;
}
}
return orderBy;
}
void QgsOrderByDialog::onCellDoubleClicked( int row, int column )
{
// Only act on first cell where the expression text is
if ( 0 == column )
{
QgsExpressionBuilderDialog dlg( mLayer );
dlg.setExpressionText( mOrderByTableWidget->item( row, column )->text() );
if ( dlg.exec() )
{
QString expressionText = dlg.expressionText();
mOrderByTableWidget->item( row, column )->setText( expressionText );
if ( row == mOrderByTableWidget->rowCount() - 1 )
{
// Add an empty widget at the end if the last row was edited
mOrderByTableWidget->insertRow( mOrderByTableWidget->rowCount() );
QTableWidgetItem* expressionItem = new QTableWidgetItem( "" );
QCheckBox* ascCheckBox = new QCheckBox();
ascCheckBox->setChecked( true );
QCheckBox* nullsFirstCheckBox = new QCheckBox();
mOrderByTableWidget->setItem( row + 1, 0, expressionItem );
mOrderByTableWidget->setCellWidget( row + 1, 1, ascCheckBox );
mOrderByTableWidget->setCellWidget( row + 1, 2, nullsFirstCheckBox );
}
}
}
}
void QgsOrderByDialog::onCellChanged( int row, int column )
{
// If the text was cleared
if ( mOrderByTableWidget->item( row, column )->text().isEmpty() )
{
// If the first column (expression text) and not the last row was edited
if ( 0 == column && row != mOrderByTableWidget->rowCount() - 1 )
{
{
mOrderByTableWidget->removeRow( row );
}
}
}
else
{
// If it's the last row and an expression was added: add a new empty one
if ( row == mOrderByTableWidget->rowCount() - 1 && !mOrderByTableWidget->item( row, column )->text().isEmpty() )
{
// Add an empty widget at the end if the last row was edited
mOrderByTableWidget->insertRow( mOrderByTableWidget->rowCount() );
QTableWidgetItem* expressionItem = new QTableWidgetItem( "" );
QCheckBox* ascCheckBox = new QCheckBox();
ascCheckBox->setChecked( true );
QCheckBox* nullsFirstCheckBox = new QCheckBox();
mOrderByTableWidget->setItem( row + 1, 0, expressionItem );
mOrderByTableWidget->setCellWidget( row + 1, 1, ascCheckBox );
mOrderByTableWidget->setCellWidget( row + 1, 2, nullsFirstCheckBox );
}
}
}
bool QgsOrderByDialog::eventFilter( QObject* obj, QEvent* e )
{
Q_UNUSED( obj )
Q_ASSERT( obj == mOrderByTableWidget );
if ( e->type() == QEvent::KeyPress )
{
QKeyEvent* keyEvent = static_cast<QKeyEvent*>( e );
if ( keyEvent->key() == Qt::Key_Delete )
{
if ( mOrderByTableWidget->currentRow() != mOrderByTableWidget->rowCount() - 1 )
mOrderByTableWidget->removeRow( mOrderByTableWidget->currentRow() );
return true;
}
}
return false;
}