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authorTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
committerTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
commitbd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch)
tree7a520322212d48ebcb9fbe1087e7fca28b76185c /src/sql/qsqlform.cpp
downloadqt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz
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+/****************************************************************************
+**
+** Implementation of QSqlForm class
+**
+** Created : 2000-11-03
+**
+** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the sql module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at [email protected].
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file. Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qsqlform.h"
+
+#ifndef QT_NO_SQL_FORM
+
+#include "qsqlfield.h"
+#include "qsqlpropertymap.h"
+#include "qsqlrecord.h"
+#include "qstringlist.h"
+#include "qwidget.h"
+#include "qdict.h"
+
+class QSqlFormPrivate
+{
+public:
+ QSqlFormPrivate() : propertyMap( 0 ), buf( 0 ), dirty( FALSE ) {}
+ ~QSqlFormPrivate() { if ( propertyMap ) delete propertyMap; }
+ QStringList fld;
+ QDict<QWidget> wgt;
+ QMap< QWidget *, QSqlField * > map;
+ QSqlPropertyMap * propertyMap;
+ QSqlRecord* buf;
+ bool dirty;
+};
+
+/*!
+ \class QSqlForm
+ \brief The QSqlForm class creates and manages data entry forms
+ tied to SQL databases.
+
+ \ingroup database
+ \mainclass
+ \module sql
+
+ Typical use of a QSqlForm consists of the following steps:
+ \list
+ \i Create the widgets you want to appear in the form.
+ \i Create a cursor and navigate to the record to be edited.
+ \i Create the QSqlForm.
+ \i Set the form's record buffer to the cursor's update buffer.
+ \i Insert each widget and the field it is to edit into the form.
+ \i Use readFields() to update the editor widgets with values from
+ the database's fields.
+ \i Display the form and let the user edit values etc.
+ \i Use writeFields() to update the database's field values with
+ the values in the editor widgets.
+ \endlist
+
+ Note that a QSqlForm does not access the database directly, but
+ most often via QSqlFields which are part of a QSqlCursor. A
+ QSqlCursor::insert(), QSqlCursor::update() or QSqlCursor::del()
+ call is needed to actually write values to the database.
+
+ Some sample code to initialize a form successfully:
+
+ \code
+ QLineEdit myEditor( this );
+ QSqlForm myForm( this );
+ QSqlCursor myCursor( "mytable" );
+
+ // Execute a query to make the cursor valid
+ myCursor.select();
+ // Move the cursor to a valid record (the first record)
+ myCursor.next();
+ // Set the form's record pointer to the cursor's edit buffer (which
+ // contains the current record's values)
+ myForm.setRecord( myCursor.primeUpdate() );
+
+ // Insert a field into the form that uses myEditor to edit the
+ // field 'somefield' in 'mytable'
+ myForm.insert( &myEditor, "somefield" );
+
+ // Update myEditor with the value from the mapped database field
+ myForm.readFields();
+ ...
+ // Let the user edit the form
+ ...
+ // Update the database
+ myForm.writeFields(); // Update the cursor's edit buffer from the form
+ myCursor.update(); // Update the database from the cursor's buffer
+ \endcode
+
+ If you want to use custom editors for displaying and editing data
+ fields, you must install a custom QSqlPropertyMap. The form
+ uses this object to get or set the value of a widget.
+
+ Note that \link designer-manual.book Qt Designer\endlink provides
+ a visual means of creating data-aware forms.
+
+ \sa installPropertyMap(), QSqlPropertyMap
+*/
+
+
+/*!
+ Constructs a QSqlForm with parent \a parent and called \a name.
+*/
+QSqlForm::QSqlForm( QObject * parent, const char * name )
+ : QObject( parent, name )
+{
+ d = new QSqlFormPrivate();
+}
+
+/*!
+ Destroys the object and frees any allocated resources.
+*/
+QSqlForm::~QSqlForm()
+{
+ delete d;
+}
+
+/*!
+ Installs a custom QSqlPropertyMap. This is useful if you plan to
+ create your own custom editor widgets.
+
+ QSqlForm takes ownership of \a pmap, so \a pmap is deleted when
+ QSqlForm goes out of scope.
+
+ \sa QDataTable::installEditorFactory()
+*/
+void QSqlForm::installPropertyMap( QSqlPropertyMap * pmap )
+{
+ if( d->propertyMap )
+ delete d->propertyMap;
+ d->propertyMap = pmap;
+}
+
+/*!
+ Sets \a buf as the record buffer for the form. To force the
+ display of the data from \a buf, use readFields().
+
+ \sa readFields() writeFields()
+*/
+
+void QSqlForm::setRecord( QSqlRecord* buf )
+{
+ d->dirty = TRUE;
+ d->buf = buf;
+}
+
+/*!
+ Inserts a \a widget, and the name of the \a field it is to be
+ mapped to, into the form. To actually associate inserted widgets
+ with an edit buffer, use setRecord().
+
+ \sa setRecord()
+*/
+
+void QSqlForm::insert( QWidget * widget, const QString& field )
+{
+ d->dirty = TRUE;
+ d->wgt.insert( field, widget );
+ d->fld += field;
+}
+
+/*!
+ \overload
+
+ Removes \a field from the form.
+*/
+
+void QSqlForm::remove( const QString& field )
+{
+ d->dirty = TRUE;
+ if ( d->fld.find( field ) != d->fld.end() )
+ d->fld.remove( d->fld.find( field ) );
+ d->wgt.remove( field );
+}
+
+/*!
+ \overload
+
+ Inserts a \a widget, and the \a field it is to be mapped to, into
+ the form.
+*/
+
+void QSqlForm::insert( QWidget * widget, QSqlField * field )
+{
+ d->map[widget] = field;
+}
+
+/*!
+ Removes a \a widget, and hence the field it's mapped to, from the
+ form.
+*/
+
+void QSqlForm::remove( QWidget * widget )
+{
+ d->map.remove( widget );
+}
+
+/*!
+ Clears the values in all the widgets, and the fields they are
+ mapped to, in the form. If \a nullify is TRUE (the default is
+ FALSE), each field is also set to NULL.
+*/
+void QSqlForm::clearValues( bool nullify )
+{
+ QMap< QWidget *, QSqlField * >::Iterator it;
+ for( it = d->map.begin(); it != d->map.end(); ++it ){
+ QSqlField* f = (*it);
+ if ( f )
+ f->clear( nullify );
+ }
+ readFields();
+}
+
+/*!
+ Removes every widget, and the fields they're mapped to, from the form.
+*/
+void QSqlForm::clear()
+{
+ d->dirty = TRUE;
+ d->fld.clear();
+ clearMap();
+}
+
+/*!
+ Returns the number of widgets in the form.
+*/
+uint QSqlForm::count() const
+{
+ return (uint)d->map.count();
+}
+
+/*!
+ Returns the \a{i}-th widget in the form. Useful for traversing
+ the widgets in the form.
+*/
+QWidget * QSqlForm::widget( uint i ) const
+{
+ QMap< QWidget *, QSqlField * >::ConstIterator it;
+ uint cnt = 0;
+
+ if( i > d->map.count() ) return 0;
+ for( it = d->map.begin(); it != d->map.end(); ++it ){
+ if( cnt++ == i )
+ return it.key();
+ }
+ return 0;
+}
+
+/*!
+ Returns the widget that field \a field is mapped to.
+*/
+QWidget * QSqlForm::fieldToWidget( QSqlField * field ) const
+{
+ QMap< QWidget *, QSqlField * >::ConstIterator it;
+ for( it = d->map.begin(); it != d->map.end(); ++it ){
+ if( *it == field )
+ return it.key();
+ }
+ return 0;
+}
+
+/*!
+ Returns the SQL field that widget \a widget is mapped to.
+*/
+QSqlField * QSqlForm::widgetToField( QWidget * widget ) const
+{
+ if( d->map.contains( widget ) )
+ return d->map[widget];
+ else
+ return 0;
+}
+
+/*!
+ Updates the widgets in the form with current values from the SQL
+ fields they are mapped to.
+*/
+void QSqlForm::readFields()
+{
+ sync();
+ QSqlField * f;
+ QMap< QWidget *, QSqlField * >::Iterator it;
+ QSqlPropertyMap * pmap = (d->propertyMap == 0) ?
+ QSqlPropertyMap::defaultMap() : d->propertyMap;
+ for(it = d->map.begin() ; it != d->map.end(); ++it ){
+ f = widgetToField( it.key() );
+ if( !f )
+ continue;
+ pmap->setProperty( it.key(), f->value() );
+ }
+}
+
+/*!
+ Updates the SQL fields with values from the widgets they are
+ mapped to. To actually update the database with the contents of
+ the record buffer, use QSqlCursor::insert(), QSqlCursor::update()
+ or QSqlCursor::del() as appropriate.
+*/
+void QSqlForm::writeFields()
+{
+ sync();
+ QSqlField * f;
+ QMap< QWidget *, QSqlField * >::Iterator it;
+ QSqlPropertyMap * pmap = (d->propertyMap == 0) ?
+ QSqlPropertyMap::defaultMap() : d->propertyMap;
+
+ for(it = d->map.begin() ; it != d->map.end(); ++it ){
+ f = widgetToField( it.key() );
+ if( !f )
+ continue;
+ f->setValue( pmap->property( it.key() ) );
+ }
+}
+
+/*!
+ Updates the widget \a widget with the value from the SQL field it
+ is mapped to. Nothing happens if no SQL field is mapped to the \a
+ widget.
+*/
+void QSqlForm::readField( QWidget * widget )
+{
+ sync();
+ QSqlField * field = 0;
+ QSqlPropertyMap * pmap = (d->propertyMap == 0) ?
+ QSqlPropertyMap::defaultMap() : d->propertyMap;
+ field = widgetToField( widget );
+ if( field )
+ pmap->setProperty( widget, field->value() );
+}
+
+/*!
+ Updates the SQL field with the value from the \a widget it is
+ mapped to. Nothing happens if no SQL field is mapped to the \a
+ widget.
+*/
+void QSqlForm::writeField( QWidget * widget )
+{
+ sync();
+ QSqlField * field = 0;
+ QSqlPropertyMap * pmap = (d->propertyMap == 0) ?
+ QSqlPropertyMap::defaultMap() : d->propertyMap;
+ field = widgetToField( widget );
+ if( field )
+ field->setValue( pmap->property( widget ) );
+}
+
+/*! \internal
+*/
+
+void QSqlForm::sync()
+{
+ if ( d->dirty ) {
+ clearMap();
+ if ( d->buf ) {
+ for ( uint i = 0; i < d->fld.count(); ++i )
+ insert( d->wgt[ d->fld[ i ] ], d->buf->field( d->fld[ i ] ) );
+ }
+ }
+ d->dirty = FALSE;
+}
+
+/*! \internal
+
+ Clears the internal map of widget/field associations
+*/
+
+void QSqlForm::clearMap()
+{
+ d->map.clear();
+}
+
+#endif // QT_NO_SQL