You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
qt3/src/sql/qsqlpropertymap.cpp

305 lines
8.7 KiB

/****************************************************************************
**
** Definition of QSqlPropertyMap class
**
** Created : 2000-11-20
**
** 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 sales@trolltech.com.
**
** 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 "qsqlpropertymap.h"
#ifndef QT_NO_SQL_FORM
#include "qwidget.h"
#include "qcleanuphandler.h"
#include "qmetaobject.h"
#include "qmap.h"
class QSqlPropertyMapPrivate
{
public:
QSqlPropertyMapPrivate() {}
QMap< QString, QString > propertyMap;
};
/*!
\class QSqlPropertyMap qsqlpropertymap.h
\brief The QSqlPropertyMap class is used to map widgets to SQL fields.
\ingroup database
\module sql
The SQL module uses Qt \link properties.html object
properties\endlink to insert and extract values from editor
widgets.
This class is used to map editors to SQL fields. This works by
associating SQL editor class names to the properties used to
insert and extract values to/from the editor.
For example, a QLineEdit can be used to edit text strings and
other data types in QDataTables or QSqlForms. Several properties
are defined in QLineEdit, but only the \e text property is used to
insert and extract text from a QLineEdit. Both QDataTable and
QSqlForm use the global QSqlPropertyMap for inserting and
extracting values to and from an editor widget. The global
property map defines several common widgets and properties that
are suitable for many applications. You can add and remove widget
properties to suit your specific needs.
If you want to use custom editors with your QDataTable or
QSqlForm, you must install your own QSqlPropertyMap for that table
or form. Example:
\code
QSqlPropertyMap *myMap = new QSqlPropertyMap();
QSqlForm *myForm = new QSqlForm( this );
MyEditor myEditor( this );
// Set the QSqlForm's record buffer to the update buffer of
// a pre-existing QSqlCursor called 'cur'.
myForm->setRecord( cur->primeUpdate() );
// Install the customized map
myMap->insert( "MyEditor", "content" );
myForm->installPropertyMap( myMap ); // myForm now owns myMap
...
// Insert a field into the form that uses a myEditor to edit the
// field 'somefield'
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 fields with the values in the form
myForm->writeFields();
...
\endcode
You can also replace the global QSqlPropertyMap that is used by
default. (Bear in mind that QSqlPropertyMap takes ownership of the
new default map.)
\code
QSqlPropertyMap *myMap = new QSqlPropertyMap;
myMap->insert( "MyEditor", "content" );
QSqlPropertyMap::installDefaultMap( myMap );
...
\endcode
\sa QDataTable, QSqlForm, QSqlEditorFactory
*/
/*!
Constructs a QSqlPropertyMap.
The default property mappings used by Qt widgets are:
\table
\header \i Widgets \i Property
\row \i \l QCheckBox,
\l QRadioButton
\i checked
\row \i \l QComboBox,
\l QListBox
\i currentItem
\row \i \l QDateEdit
\i date
\row \i \l QDateTimeEdit
\i dateTime
\row \i \l QTextBrowser
\i source
\row \i \l QButton,
\l QDial,
\l QLabel,
\l QLineEdit,
\l QMultiLineEdit,
\l QPushButton,
\l QTextEdit,
\i text
\row \i \l QTimeEdit
\i time
\row \i \l QLCDNumber,
\l QScrollBar
\l QSlider,
\l QSpinBox
\i value
\endtable
*/
QSqlPropertyMap::QSqlPropertyMap()
{
d = new QSqlPropertyMapPrivate();
const struct MapData {
const char *classname;
const char *property;
} mapData[] = {
{ "QButton", "text" },
{ "QCheckBox", "checked" },
{ "QRadioButton", "checked" },
{ "QComboBox", "currentItem" },
{ "QDateEdit", "date" },
{ "QDateTimeEdit", "dateTime" },
{ "QDial", "value" },
{ "QLabel", "text" },
{ "QLCDNumber", "value" },
{ "QLineEdit", "text" },
{ "QListBox", "currentItem" },
{ "QMultiLineEdit", "text" },
{ "QPushButton", "text" },
{ "QScrollBar", "value" },
{ "QSlider", "value" },
{ "QSpinBox", "value" },
{ "QTextBrowser", "source" },
{ "QTextEdit", "text" },
{ "QTextView", "text" },
{ "QTimeEdit", "time" }
};
const MapData *m = mapData;
for ( uint i = 0; i < sizeof(mapData)/sizeof(MapData); i++, m++ )
d->propertyMap.insert( m->classname, m->property );
}
/*!
Destroys the QSqlPropertyMap.
Note that if the QSqlPropertyMap is installed with
installPropertyMap() the object it was installed into, e.g. the
QSqlForm, takes ownership and will delete the QSqlPropertyMap when
necessary.
*/
QSqlPropertyMap::~QSqlPropertyMap()
{
delete d;
}
/*!
Returns the mapped property of \a widget as a QVariant.
*/
QVariant QSqlPropertyMap::property( QWidget * widget )
{
if( !widget ) return QVariant();
const QMetaObject* mo = widget->metaObject();
while ( mo && !d->propertyMap.contains( QString( mo->className() ) ) )
mo = mo->superClass();
if ( !mo ) {
#ifdef QT_CHECK_RANGE
qWarning("QSqlPropertyMap::property: %s does not exist", widget->metaObject()->className() );
#endif
return QVariant();
}
return widget->property( d->propertyMap[ mo->className() ] );
}
/*!
Sets the property of \a widget to \a value.
*/
void QSqlPropertyMap::setProperty( QWidget * widget, const QVariant & value )
{
if( !widget ) return;
QMetaObject* mo = widget->metaObject();
while ( mo && !d->propertyMap.contains( QString( mo->className() ) ) )
mo = mo->superClass();
if ( !mo ) {
#ifdef QT_CHECK_RANGE
qWarning("QSqlPropertyMap::setProperty: %s not handled by QSqlPropertyMap", widget->metaObject()->className() );
#endif
return;
}
widget->setProperty( d->propertyMap[ mo->className() ], value );
}
/*!
Insert a new classname/property pair, which is used for custom SQL
field editors. There \e must be a \c Q_PROPERTY clause in the \a
classname class declaration for the \a property.
*/
void QSqlPropertyMap::insert( const QString & classname,
const QString & property )
{
d->propertyMap[ classname ] = property;
}
/*!
Removes \a classname from the map.
*/
void QSqlPropertyMap::remove( const QString & classname )
{
d->propertyMap.remove( classname );
}
static QSqlPropertyMap * defaultmap = 0;
static QCleanupHandler< QSqlPropertyMap > qsql_cleanup_property_map;
/*!
Returns the application global QSqlPropertyMap.
*/
QSqlPropertyMap * QSqlPropertyMap::defaultMap()
{
if( defaultmap == 0 ){
defaultmap = new QSqlPropertyMap();
qsql_cleanup_property_map.add( &defaultmap );
}
return defaultmap;
}
/*!
Replaces the global default property map with \a map. All
QDataTable and QSqlForm instantiations will use this new map for
inserting and extracting values to and from editors.
\e{QSqlPropertyMap takes ownership of \a map, and destroys it
when it is no longer needed.}
*/
void QSqlPropertyMap::installDefaultMap( QSqlPropertyMap * map )
{
if( map == 0 ) return;
if( defaultmap != 0 ){
qsql_cleanup_property_map.remove( &defaultmap );
delete defaultmap;
}
defaultmap = map;
qsql_cleanup_property_map.add( &defaultmap );
}
#endif // QT_NO_SQL_FORM