qitemeditorfactory.cpp

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#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
    bool value;

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

#endif // QT_NO_COMBOBOX

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);
}

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();
}

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);
}

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; }
};

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

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

#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