summaryrefslogtreecommitdiffstats
path: root/src/gui/itemviews/qitemeditorfactory.cpp
blob: 480a47211516649aab219af9362403959e0e4a47 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include <qplatformdefs.h>
#include "qitemeditorfactory.h"
#include "qitemeditorfactory_p.h"

#ifndef QT_NO_ITEMVIEWS

#include <qcombobox.h>
#include <qdatetimeedit.h>
#include <qlabel.h>
#include <qlineedit.h>
#include <qspinbox.h>
#include <limits.h>
#include <float.h>
#include <qapplication.h>
#include <qdebug.h>

QT_BEGIN_NAMESPACE


#ifndef QT_NO_COMBOBOX

class QBooleanComboBox : public QComboBox
{
    Q_OBJECT
    Q_PROPERTY(bool value READ value WRITE setValue USER true)

public:
    QBooleanComboBox(QWidget *parent);
    void setValue(bool);
    bool value() const;
};

#endif // QT_NO_COMBOBOX

/*!
    \class QItemEditorFactory
    \brief The QItemEditorFactory class provides widgets for editing item data
    in views and delegates.
    \since 4.2
    \ingroup model-view

    When editing data in an item view, editors are created and
    displayed by a delegate. QItemDelegate, which is the delegate by
    default installed on Qt's item views, uses a QItemEditorFactory to
    create editors for it. A default unique instance provided by
    QItemEditorFactory is used by all item delegates.  If you set a
    new default factory with setDefaultFactory(), the new factory will
    be used by existing and new delegates.

    A factory keeps a collection of QItemEditorCreatorBase
    instances, which are specialized editors that produce editors
    for one particular QVariant data type (All Qt models store
    their data in \l{QVariant}s).

    \section1 Standard Editing Widgets

    The standard factory implementation provides editors for a variety of data
    types. These are created whenever a delegate needs to provide an editor for
    data supplied by a model. The following table shows the relationship between
    types and the standard editors provided.

    \table
    \header \o Type \o Editor Widget
    \row    \o bool \o QComboBox
    \row    \o double \o QDoubleSpinBox
    \row    \o int \o{1,2} QSpinBox
    \row    \o unsigned int
    \row    \o QDate \o QDateEdit
    \row    \o QDateTime \o QDateTimeEdit
    \row    \o QPixmap \o QLabel
    \row    \o QString \o QLineEdit
    \row    \o QTime \o QTimeEdit
    \endtable

    Additional editors can be registered with the registerEditor() function.

    \sa QItemDelegate, {Model/View Programming}, {Color Editor Factory Example}
*/

/*!
    \fn QItemEditorFactory::QItemEditorFactory()

    Constructs a new item editor factory.
*/

/*!
    Creates an editor widget with the given \a parent for the specified \a type of data,
    and returns it as a QWidget.

    \sa registerEditor()
*/
QWidget *QItemEditorFactory::createEditor(QVariant::Type type, QWidget *parent) const
{
    QItemEditorCreatorBase *creator = creatorMap.value(type, 0);
    if (!creator) {
        const QItemEditorFactory *dfactory = defaultFactory();
        return dfactory == this ? 0 : dfactory->createEditor(type, parent);
    }
    return creator->createWidget(parent);
}

/*!
    Returns the property name used to access data for the given \a type of data.
*/
QByteArray QItemEditorFactory::valuePropertyName(QVariant::Type type) const
{
    QItemEditorCreatorBase *creator = creatorMap.value(type, 0);
    if (!creator) {
        const QItemEditorFactory *dfactory = defaultFactory();
        return dfactory == this ? QByteArray() : dfactory->valuePropertyName(type);
    }
    return creator->valuePropertyName();
}

/*!
    Destroys the item editor factory.
*/
QItemEditorFactory::~QItemEditorFactory()
{
    //we make sure we delete all the QItemEditorCreatorBase
    //this has to be done only once, hence the QSet
    QSet<QItemEditorCreatorBase*> set = creatorMap.values().toSet();
    qDeleteAll(set);
}

/*!
    Registers an item editor creator specified by \a creator for the given \a type of data.

    \bold{Note:} The factory takes ownership of the item editor creator and will destroy
    it if a new creator for the same type is registered later.

    \sa createEditor()
*/
void QItemEditorFactory::registerEditor(QVariant::Type type, QItemEditorCreatorBase *creator)
{
    QHash<QVariant::Type, QItemEditorCreatorBase *>::iterator it = creatorMap.find(type);
    if (it != creatorMap.end()) {
        QItemEditorCreatorBase *oldCreator = it.value();
        Q_ASSERT(oldCreator);
        creatorMap.erase(it);
        if (!creatorMap.values().contains(oldCreator))
            delete oldCreator; // if it is no more in use we can delete it
    }

    creatorMap[type] = creator;
}

class QDefaultItemEditorFactory : public QItemEditorFactory
{
public:
    inline QDefaultItemEditorFactory() {}
    QWidget *createEditor(QVariant::Type type, QWidget *parent) const;
    QByteArray valuePropertyName(QVariant::Type) const;
};

QWidget *QDefaultItemEditorFactory::createEditor(QVariant::Type type, QWidget *parent) const
{
    switch (type) {
#ifndef QT_NO_COMBOBOX
    case QVariant::Bool: {
        QBooleanComboBox *cb = new QBooleanComboBox(parent);
        cb->setFrame(false);
        return cb; }
#endif
#ifndef QT_NO_SPINBOX
    case QVariant::UInt: {
        QSpinBox *sb = new QSpinBox(parent);
        sb->setFrame(false);
        sb->setMaximum(INT_MAX);
        return sb; }
    case QVariant::Int: {
        QSpinBox *sb = new QSpinBox(parent);
        sb->setFrame(false);
        sb->setMinimum(INT_MIN);
        sb->setMaximum(INT_MAX);
        return sb; }
#endif
#ifndef QT_NO_DATETIMEEDIT
    case QVariant::Date: {
        QDateTimeEdit *ed = new QDateEdit(parent);
        ed->setFrame(false);
        return ed; }
    case QVariant::Time: {
        QDateTimeEdit *ed = new QTimeEdit(parent);
        ed->setFrame(false);
        return ed; }
    case QVariant::DateTime: {
        QDateTimeEdit *ed = new QDateTimeEdit(parent);
        ed->setFrame(false);
        return ed; }
#endif
    case QVariant::Pixmap:
        return new QLabel(parent);
#ifndef QT_NO_SPINBOX
    case QVariant::Double: {
        QDoubleSpinBox *sb = new QDoubleSpinBox(parent);
        sb->setFrame(false);
        sb->setMinimum(-DBL_MAX);
        sb->setMaximum(DBL_MAX);
        return sb; }
#endif
#ifndef QT_NO_LINEEDIT
    case QVariant::String:
    default: {
        // the default editor is a lineedit
        QExpandingLineEdit *le = new QExpandingLineEdit(parent);
        le->setFrame(le->style()->styleHint(QStyle::SH_ItemView_DrawDelegateFrame, 0, le));
        if (!le->style()->styleHint(QStyle::SH_ItemView_ShowDecorationSelected, 0, le))
            le->setWidgetOwnsGeometry(true);
        return le; }
#else
    default:
        break;
#endif
    }
    return 0;
}

QByteArray QDefaultItemEditorFactory::valuePropertyName(QVariant::Type type) const
{
    switch (type) {
#ifndef QT_NO_COMBOBOX
    case QVariant::Bool:
        return "currentIndex";
#endif
#ifndef QT_NO_SPINBOX
    case QVariant::UInt:
    case QVariant::Int:
    case QVariant::Double:
        return "value";
#endif
#ifndef QT_NO_DATETIMEEDIT
    case QVariant::Date:
        return "date";
    case QVariant::Time:
        return "time";
    case QVariant::DateTime:
        return "dateTime";
#endif
    case QVariant::String:
    default:
        // the default editor is a lineedit
        return "text";
    }
}

static QItemEditorFactory *q_default_factory = 0;
struct QDefaultFactoryCleaner
{
    inline QDefaultFactoryCleaner() {}
    ~QDefaultFactoryCleaner() { delete q_default_factory; q_default_factory = 0; }
};

/*!
    Returns the default item editor factory.

    \sa setDefaultFactory()
*/
const QItemEditorFactory *QItemEditorFactory::defaultFactory()
{
    static const QDefaultItemEditorFactory factory;
    if (q_default_factory)
        return q_default_factory;
    return &factory;
}

/*!
    Sets the default item editor factory to the given \a factory.
    Both new and existing delegates will use the new factory.

    \sa defaultFactory()
*/
void QItemEditorFactory::setDefaultFactory(QItemEditorFactory *factory)
{
    static const QDefaultFactoryCleaner cleaner;
    delete q_default_factory;
    q_default_factory = factory;
}

/*!
    \class QItemEditorCreatorBase
    \brief The QItemEditorCreatorBase class provides an abstract base class that
    must be subclassed when implementing new item editor creators.
    \since 4.2
    \ingroup model-view

    QItemEditorCreatorBase objects are specialized widget factories that
    provide editor widgets for one particular QVariant data type. They
    are used by QItemEditorFactory to create editors for
    \l{QItemDelegate}s. Creator bases must be registered with
    QItemEditorFactory::registerEditor().

    An editor should provide a user property for the data it edits.
    QItemDelagates can then access the property using Qt's
    \l{Meta-Object System}{meta-object system} to set and retrieve the
    editing data. A property is set as the user property with the USER
    keyword:

    \snippet doc/src/snippets/code/src_gui_itemviews_qitemeditorfactory.cpp 0

    If the editor does not provide a user property, it must return the
    name of the property from valuePropertyName(); delegates will then
    use the name to access the property. If a user property exists,
    item delegates will not call valuePropertyName().

    QStandardItemEditorCreator is a convenience template class that can be used
    to register widgets without the need to subclass QItemEditorCreatorBase.

    \sa QStandardItemEditorCreator, QItemEditorFactory,
    {Model/View Programming}, {Color Editor Factory Example}
*/

/*!
    \fn QItemEditorCreatorBase::~QItemEditorCreatorBase()

    Destroys the editor creator object.
*/

/*!
    \fn QWidget *QItemEditorCreatorBase::createWidget(QWidget *parent) const

    Returns an editor widget with the given \a parent.

    When implementing this function in subclasses of this class, you must
    construct and return new editor widgets with the parent widget specified.
*/

/*!
    \fn QByteArray QItemEditorCreatorBase::valuePropertyName() const

    Returns the name of the property used to get and set values in the creator's
    editor widgets.

    When implementing this function in subclasses, you must ensure that the
    editor widget's property specified by this function can accept the type
    the creator is registered for. For example, a creator which constructs
    QCheckBox widgets to edit boolean values would return the
    \l{QCheckBox::checkable}{checkable} property name from this function,
    and must be registered in the item editor factory for the QVariant::Bool
    type.

    Note: Since Qt 4.2 the item delegates query the user property of widgets,
    and only call this function if the widget has no user property. You can
    override this behavior by reimplementing QAbstractItemDelegate::setModelData()
    and QAbstractItemDelegate::setEditorData().

    \sa QMetaObject::userProperty(), QItemEditorFactory::registerEditor()
*/

/*!
    \class QItemEditorCreator
    \brief The QItemEditorCreator class makes it possible to create
	   item editor creator bases without subclassing
	   QItemEditorCreatorBase.

    \since 4.2
    \ingroup model-view

    QItemEditorCreator is a convenience template class. It uses
    the template class to create editors for QItemEditorFactory.
    This way, it is not necessary to subclass
    QItemEditorCreatorBase.

    \snippet doc/src/snippets/code/src_gui_itemviews_qitemeditorfactory.cpp 1

    The constructor takes the name of the property that contains the
    editing data. QItemDelegate can then access the property by name
    when it sets and retrieves editing data. Only use this class if
    your editor does not define a user property (using the USER
    keyword in the Q_PROPERTY macro).  If the widget has a user
    property, you should use QStandardItemEditorCreator instead.

    \sa QItemEditorCreatorBase, QStandardItemEditorCreator,
	QItemEditorFactory, {Color Editor Factory Example}
*/

/*!
    \fn QItemEditorCreator::QItemEditorCreator(const QByteArray &valuePropertyName)

    Constructs an editor creator object using \a valuePropertyName
    as the name of the property to be used for editing. The
    property name is used by QItemDelegate when setting and
    getting editor data.

    Note that the \a valuePropertyName is only used if the editor
    widget does not have a user property defined.
*/

/*!
    \fn QWidget *QItemEditorCreator::createWidget(QWidget *parent) const
    \reimp
*/

/*!
    \fn QByteArray QItemEditorCreator::valuePropertyName() const
    \reimp
*/

/*!
    \class QStandardItemEditorCreator

    \brief The QStandardItemEditorCreator class provides the
    possibility to register widgets without having to subclass
    QItemEditorCreatorBase.

    \since 4.2
    \ingroup model-view

    This convenience template class makes it possible to register widgets without
    having to subclass QItemEditorCreatorBase.

    Example:

    \snippet doc/src/snippets/code/src_gui_itemviews_qitemeditorfactory.cpp 2

    Setting the \c editorFactory created above in an item delegate via
    QItemDelegate::setItemEditorFactory() makes sure that all values of type
    QVariant::DateTime will be edited in \c{MyFancyDateTimeEdit}.

    The editor must provide a user property that will contain the
    editing data. The property is used by \l{QItemDelegate}s to set
    and retrieve the data (using Qt's \l{Meta-Object
    System}{meta-object system}). You set the user property with
    the USER keyword:

    \snippet doc/src/snippets/code/src_gui_itemviews_qitemeditorfactory.cpp 3

    \sa QItemEditorCreatorBase, QItemEditorCreator,
	QItemEditorFactory, QItemDelegate, {Color Editor Factory Example}
*/

/*!
    \fn QStandardItemEditorCreator::QStandardItemEditorCreator()

    Constructs an editor creator object.
*/

/*!
    \fn QWidget *QStandardItemEditorCreator::createWidget(QWidget *parent) const
    \reimp
*/

/*!
    \fn QByteArray QStandardItemEditorCreator::valuePropertyName() const
    \reimp
*/

#ifndef QT_NO_LINEEDIT

QExpandingLineEdit::QExpandingLineEdit(QWidget *parent)
    : QLineEdit(parent), originalWidth(-1), widgetOwnsGeometry(false)
{
    connect(this, SIGNAL(textChanged(QString)), this, SLOT(resizeToContents()));
    updateMinimumWidth();
}

void QExpandingLineEdit::changeEvent(QEvent *e)
{
    switch (e->type())
    {
    case QEvent::FontChange:
    case QEvent::StyleChange:
    case QEvent::ContentsRectChange:
        updateMinimumWidth();
        break;
    default:
        break;
    }

    QLineEdit::changeEvent(e);
}

void QExpandingLineEdit::updateMinimumWidth()
{
    int left, right;
    getTextMargins(&left, 0, &right, 0);
    int width = left + right + 4 /*horizontalMargin in qlineedit.cpp*/;
    getContentsMargins(&left, 0, &right, 0);
    width += left + right;

    QStyleOptionFrameV2 opt;
    initStyleOption(&opt);
    
    int minWidth = style()->sizeFromContents(QStyle::CT_LineEdit, &opt, QSize(width, 0).
                                      expandedTo(QApplication::globalStrut()), this).width();
    setMinimumWidth(minWidth);
}

void QExpandingLineEdit::resizeToContents()
{
    int oldWidth = width();
    if (originalWidth == -1)
        originalWidth = oldWidth;
    if (QWidget *parent = parentWidget()) {
        QPoint position = pos();
        int hintWidth = minimumWidth() + fontMetrics().width(displayText());
        int parentWidth = parent->width();
        int maxWidth = isRightToLeft() ? position.x() + oldWidth : parentWidth - position.x();
        int newWidth = qBound(originalWidth, hintWidth, maxWidth);
        if (widgetOwnsGeometry)
            setMaximumWidth(newWidth);
        if (isRightToLeft())
            move(position.x() - newWidth + oldWidth, position.y());
        resize(newWidth, height());
    }
}

#endif // QT_NO_LINEEDIT

#ifndef QT_NO_COMBOBOX

QBooleanComboBox::QBooleanComboBox(QWidget *parent)
    : QComboBox(parent)
{
    addItem(QComboBox::tr("False"));
    addItem(QComboBox::tr("True"));
}

void QBooleanComboBox::setValue(bool value)
{
    setCurrentIndex(value ? 1 : 0);
}

bool QBooleanComboBox::value() const
{
    return (currentIndex() == 1);
}

#endif // QT_NO_COMBOBOX

QT_END_NAMESPACE

#if !defined(QT_NO_LINEEDIT) || !defined(QT_NO_COMBOBOX)
#include "qitemeditorfactory.moc"
#endif

#endif // QT_NO_ITEMVIEWS