q3combobox.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    if ( rw )
	setUpLineEdit();
    setBackgroundMode( Qt::PaletteButton, Qt::PaletteBase );
}



/*!
    Destroys the combobox.
*/

Q3ComboBox::~Q3ComboBox()
{
    delete d;
}

void Q3ComboBox::setDuplicatesEnabled( bool enable )
{
   d->duplicatesEnabled = enable;
}

bool Q3ComboBox::duplicatesEnabled() const
{
    return d->duplicatesEnabled;
}

int Q3ComboBox::count() const
{
    if ( d->usingListBox() )
	return d->listBox()->count();
    else if (d->popup())
	return d->popup()->count();
    else
        return 0;
}


/*!
    \overload

    Inserts the \a list of strings at position \a index in the
    combobox.

    This is only for compatibility since it does not support Unicode
    strings. See insertStringList().
*/

void Q3ComboBox::insertStrList( const Q3StrList &list, int index )
{
    insertStrList( &list, index );
}

/*!
    \overload

    Inserts the \a list of strings at position \a index in the
    combobox.

    This is only for compatibility since it does not support Unicode
    strings. See insertStringList().
*/

void Q3ComboBox::insertStrList( const Q3StrList *list, int index )
{
    if ( !list ) {
#if defined(QT_CHECK_NULL)
	Q_ASSERT( list != 0 );
#endif
	return;
    }
    Q3StrListIterator it( *list );
    const char* tmp;
    if ( index < 0 )
	index = count();
    while ( (tmp=it.current()) ) {
	++it;
	if ( d->usingListBox() )
	    d->listBox()->insertItem( QString::fromLatin1(tmp), index );
	else
	    d->popup()->insertItem( escapedComboString(QString::fromLatin1(tmp)), index, index );
	if ( index++ == d->current && d->current < count() ) {
	    if ( d->ed ) {
		d->ed->setText( text( d->current ) );
		d->updateLinedGeometry();
	    } else
		update();
	    currentChanged();
	}
    }
    if ( index != count() )
	reIndex();
}

/*!
    Inserts the \a list of strings at position \a index in the
    combobox.
*/

void Q3ComboBox::insertStringList( const QStringList &list, int index )
{
    QStringList::ConstIterator it = list.begin();
    if ( index < 0 )
	index = count();
    while ( it != list.end() ) {
	if ( d->usingListBox() )
	    d->listBox()->insertItem( *it, index );
	else
	    d->popup()->insertItem( escapedComboString(*it), index, index );
	if ( index++ == d->current && d->current < count() ) {
	    if ( d->ed ) {
		d->ed->setText( text( d->current ) );
		d->updateLinedGeometry();
	    } else
		update();
	    currentChanged();
	}
	++it;
    }
    if ( index != count() )
	reIndex();
}

/*!
    Inserts the array of char * \a strings at position \a index in the
    combobox.

    The \a numStrings argument is the number of strings. If \a
    numStrings is -1 (default), the \a strings array must be
    terminated with 0.

    Example:
    \code
	static const char* items[] = { "red", "green", "blue", 0 };
	combo->insertStrList( items );
    \endcode

    \sa insertStringList()
*/

void Q3ComboBox::insertStrList( const char **strings, int numStrings, int index)
{
    if ( !strings ) {
#if defined(QT_CHECK_NULL)
	Q_ASSERT( strings != 0 );
#endif
	return;
    }
    if ( index < 0 )
	index = count();
    int i = 0;
    while ( (numStrings<0 && strings[i]!=0) || i<numStrings ) {
	if ( d->usingListBox() )
	    d->listBox()->insertItem( QString::fromLatin1(strings[i]), index );
	else
	    d->popup()->insertItem( escapedComboString(QString::fromLatin1(strings[i])), index, index );
	i++;
	if ( index++ == d->current && d->current < count()  ) {
	    if ( d->ed ) {
		d->ed->setText( text( d->current ) );
		d->updateLinedGeometry();
	    } else
		update();
	    currentChanged();
	}
    }
    if ( index != count() )
	reIndex();
}


/*!
    Inserts a text item with text \a t, at position \a index. The item
    will be appended if \a index is negative.
*/

void Q3ComboBox::insertItem( const QString &t, int index )
{
    int cnt = count();
    if ( !checkInsertIndex( "insertItem", name(), cnt, &index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->insertItem( t, index );
    else
	d->popup()->insertItem( escapedComboString(t), index, index );
    if ( index != cnt )
	reIndex();
    if ( index == d->current && d->current < count()  ) {
	if ( d->ed ) {
	    d->ed->setText( text( d->current ) );
	    d->updateLinedGeometry();
	} else
	    update();
    }
    if ( index == d->current )
	currentChanged();
}

/*!
    \overload

    Inserts a \a pixmap item at position \a index. The item will be
    appended if \a index is negative.
*/

void Q3ComboBox::insertItem( const QPixmap &pixmap, int index )
{
    int cnt = count();
    if ( !checkInsertIndex( "insertItem", name(), cnt, &index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->insertItem( pixmap, index );
    else
	d->popup()->insertItem( pixmap, index, index );
    if ( index != cnt )
	reIndex();
    if ( index == d->current && d->current < count()  ) {
	if ( d->ed ) {
	    d->ed->setText( text( d->current ) );
	    d->updateLinedGeometry();
	} else
	    update();
    }
    if ( index == d->current )
	currentChanged();
}

/*!
    \overload

    Inserts a \a pixmap item with additional text \a text at position
    \a index. The item will be appended if \a index is negative.
*/

void Q3ComboBox::insertItem( const QPixmap &pixmap, const QString& text, int index )
{
    int cnt = count();
    if ( !checkInsertIndex( "insertItem", name(), cnt, &index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->insertItem( pixmap, text, index );
    else
	d->popup()->insertItem( pixmap, escapedComboString(text), index, index );
    if ( index != cnt )
	reIndex();
    if ( index == d->current && d->current < count()  ) {
	if ( d->ed ) {
	    d->ed->setText( this->text( d->current ) );
	    d->updateLinedGeometry();
	} else
	    update();
    }
    if ( index == d->current )
	currentChanged();
}


/*!
    Removes the item at position \a index.
*/

void Q3ComboBox::removeItem( int index )
{
    int cnt = count();
    if ( !checkIndex( "removeItem", name(), cnt, index ) )
	return;
    if ( d->usingListBox() ) {
        QStyleOptionComboBox opt = d->getStyleOption();
	if ( style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this) && d->popup() )
	    d->popup()->removeItemAt( index );
	d->listBox()->removeItem( index );
    } else {
	d->popup()->removeItemAt( index );
    }
    if ( index != cnt-1 )
	reIndex();
    if ( index == d->current ) {
	if ( d->ed ) {
	    QString s = QString::fromLatin1("");
	    if (d->current < cnt - 1)
		s = text( d->current );
	    d->ed->setText( s );
	    d->updateLinedGeometry();
	}
	else {
	    if ( d->usingListBox() ) {
		d->current = d->listBox()->currentItem();
	    } else {
		if (d->current > count()-1 && d->current > 0)
		    d->current--;
	    }
	    update();
	}
	currentChanged();
    }
    else {
	if ( !d->ed ) {
	    if (d->current < cnt - 1)
		setCurrentItem( d->current );
	    else
		setCurrentItem( d->current - 1 );
	}
    }

}


/*!
    Removes all combobox items.
*/

void Q3ComboBox::clear()
{
    QStyleOptionComboBox opt = d->getStyleOption();
    if ( d->usingListBox() ) {
	if ( style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this) && d->popup() )
	    d->popup()->clear();
	d->listBox()->resize( 0, 0 );
	d->listBox()->clear();
    } else {
	d->popup()->clear();
    }

    if(d->popup() && style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this))
	d->popup()->setItemChecked(d->current, false);
    d->current = 0;
    if ( d->ed ) {
	d->ed->setText( QString::fromLatin1("") );
	d->updateLinedGeometry();
    }
    currentChanged();
}


QString Q3ComboBox::currentText() const
{
    if ( d->ed )
	return d->ed->text();
    else if ( d->current < count() )
	return text( currentItem() );
    else
	return QString::null;
}

void Q3ComboBox::setCurrentText( const QString& txt )
{
    int i;
    for ( i = 0; i < count(); i++)
	if ( text( i ) == txt )
	    break;
    if ( i < count() )
	setCurrentItem( i );
    else if ( d->ed )
	d->ed->setText( txt );
    else
	changeItem( txt, currentItem() );
}


/*!
    Returns the text item at position \a index, or QString::null if
    the item is not a string.

    \sa currentText()
*/

QString Q3ComboBox::text( int index ) const
{
    if ( !checkIndex( "text", name(), count(), index ) )
	return QString::null;
    if ( d->usingListBox() ) {
	return d->listBox()->text( index );
    } else {
        QString retText = d->popup()->text(index);
        retText.replace("&&", "&");
	return retText;
    }
}

/*!
    Returns the pixmap item at position \a index, or 0 if the item is
    not a pixmap.
*/

const QPixmap *Q3ComboBox::pixmap( int index ) const
{
    if ( !checkIndex( "pixmap", name(), count(), index ) )
	return 0;

    if (d->usingListBox()) {
        return d->listBox()->pixmap( index );
    } else {
        d->popupPixmaps[index] = d->popup()->pixmap(index);
        return d->popupPixmaps[index].isNull() ? 0 : &d->popupPixmaps[index];
    }
}

/*!
    Replaces the item at position \a index with the text \a t.
*/

void Q3ComboBox::changeItem( const QString &t, int index )
{
    if ( !checkIndex( "changeItem", name(), count(), index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->changeItem( t, index );
    else
	d->popup()->changeItem(index, t);
    if ( index == d->current ) {
	if ( d->ed ) {
	    d->ed->setText( text( d->current ) );
	    d->updateLinedGeometry();
	} else
	    update();
    }
}

/*!
    \overload

    Replaces the item at position \a index with the pixmap \a im,
    unless the combobox is editable.

    \sa insertItem()
*/

void Q3ComboBox::changeItem( const QPixmap &im, int index )
{
    if ( !checkIndex( "changeItem", name(), count(), index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->changeItem( im, index );
    else
	d->popup()->changeItem(index, im);
    if ( index == d->current )
	update();
}

/*!
    \overload

    Replaces the item at position \a index with the pixmap \a im and
    the text \a t.

    \sa insertItem()
*/

void Q3ComboBox::changeItem( const QPixmap &im, const QString &t, int index )
{
    if ( !checkIndex( "changeItem", name(), count(), index ) )
	return;
    if ( d->usingListBox() )
	d->listBox()->changeItem( im, t, index );
    else
	d->popup()->changeItem(index, im, t);
    if ( index == d->current )
	update();
}


int Q3ComboBox::currentItem() const
{
    return d->current;
}

void Q3ComboBox::setCurrentItem( int index )
{
    if ( index == d->current && !d->ed ) {
	return;
    }
    if ( !checkIndex( "setCurrentItem", name(), count(), index ) ) {
	return;
    }

    if ( d->usingListBox() && !( listBox()->item(index) && listBox()->item(index)->isSelectable() ) )
	return;

    QStyleOptionComboBox opt = d->getStyleOption();
    if(d->popup() && style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this))
	d->popup()->setItemChecked(d->current, false);
    d->current = index;
    d->completeAt = 0;
    if ( d->ed ) {
	d->ed->setText( text( index ) );
	d->updateLinedGeometry();
    }
    // ### We want to keep ListBox's currentItem in sync, even if NOT popuped...
    if ( d->usingListBox() && d->listBox() ) {
	d->listBox()->setCurrentItem( index );
    } else {
	internalHighlight( index );
	// internalActivate( index ); ### this leads to weird behavior, as in 3.0.1
    }

    currentChanged();
}

bool Q3ComboBox::autoResize() const
{
    return d->autoresize;
}

void Q3ComboBox::setAutoResize( bool enable )
{
    if ( (bool)d->autoresize != enable ) {
	d->autoresize = enable;
	if ( enable )
	    adjustSize();
    }
}


/*!
    \reimp

    This implementation caches the size hint to avoid resizing when
    the contents change dynamically. To invalidate the cached value
    call setFont().
*/
QSize Q3ComboBox::sizeHint() const
{
    if ( isVisible() && d->sizeHint.isValid() )
	return d->sizeHint;

    constPolish();
    int i, w;
    QFontMetrics fm = fontMetrics();

    int maxW = count() ? 18 : 7 * fm.width(QChar('x')) + 18;
    int maxH = QMAX( fm.lineSpacing(), 14 ) + 2;

    if ( !d->usingListBox() ) {
	w = d->popup()->sizeHint().width() - 2* d->popup()->frameWidth();
	if ( w > maxW )
	    maxW = w;
    } else {
	for( i = 0; i < count(); i++ ) {
	    w = d->listBox()->item( i )->width( d->listBox() );
	    if ( w > maxW )
		maxW = w;
	}
    }

    QStyleOptionComboBox opt = d->getStyleOption();
    d->sizeHint = (style()->sizeFromContents(QStyle::CT_ComboBox, &opt, QSize(maxW, maxH), this).
                   expandedTo(QApplication::globalStrut()));

    return d->sizeHint;
}


/*!
  \internal
  Receives activated signals from an internal popup list and emits
  the activated() signal.
*/

void Q3ComboBox::internalActivate( int index )
{
    QStyleOptionComboBox opt = d->getStyleOption();
    if ( d->current != index ) {
	if ( !d->usingListBox() || listBox()->item( index )->isSelectable() ) {
	    if (d->popup() && style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this))
		d->popup()->setItemChecked(d->current, false);
	    d->current = index;
	    currentChanged();
	}
    }
    if ( d->usingListBox() )
	popDownListBox();
    else
	d->popup()->removeEventFilter( this );
    d->poppedUp = false;

    QString t( text( index ) );
    if ( d->ed ) {
	d->ed->setText( t );
	d->updateLinedGeometry();
    }
    emit activated( index );
    emit activated( t );
}