q3combobox.cpp

奇趣公司比较新的qt/emd版本

static inline bool checkInsertIndex( const char *method, const char * name,
				     int count, int *index)
{
    bool range_err = (*index > count);
#if defined(QT_CHECK_RANGE)
    if ( range_err )
	qWarning( "Q3ComboBox::%s: (%s) Index %d out of range",
		 method, name ? name : "<no name>", *index );
#else
    Q_UNUSED( method )
    Q_UNUSED( name )
#endif
    if ( *index < 0 )				// append
	*index = count;
    return !range_err;
}


static inline bool checkIndex( const char *method, const char * name,
			       int count, int index )
{
    bool range_err = (index >= count);
#if defined(QT_CHECK_RANGE)
    if ( range_err )
	qWarning( "Q3ComboBox::%s: (%s) Index %i out of range",
		 method, name ? name : "<no name>", index );
#else
    Q_UNUSED( method )
    Q_UNUSED( name )
#endif
    return !range_err;
}



/*!
    Constructs a combobox widget with parent \a parent called \a name.

    This constructor creates a popup list if the program uses Motif
    (or Aqua) look and feel; this is compatible with Motif 1.x and
    Aqua.

    Note: If you use this constructor to create your Q3ComboBox, then
    the pixmap() function will always return 0. To workaround this,
    use the other constructor.

*/



Q3ComboBox::Q3ComboBox( QWidget *parent, const char *name )
    : QWidget( parent, name, Qt::WNoAutoErase )
{
    d = new Q3ComboBoxData( this );
    QStyleOptionComboBox opt;
    opt.init(this);
    if ( style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this) ||
	 style()->styleHint(QStyle::SH_GUIStyle, &opt, this) == Qt::MotifStyle ) {
	d->setPopupMenu( new Q3ComboBoxPopup( this, "in-combo" ) );
	d->popup()->setFont( font() );
	connect( d->popup(), SIGNAL(activated(int)),
			     SLOT(internalActivate(int)) );
	connect( d->popup(), SIGNAL(highlighted(int)),
			     SLOT(internalHighlight(int)) );
    } else {
	setUpListBox();
    }
    d->ed                    = 0;
    d->current               = 0;
    d->maxCount              = INT_MAX;
    d->sizeLimit	     = 10;
    d->p                     = AtBottom;
    d->autoresize            = false;
    d->poppedUp              = false;
    d->arrowDown             = false;
    d->arrowPressed          = false;
    d->discardNextMousePress = false;
    d->shortClick            = false;
    d->useCompletion         = false;
    d->completeAt            = 0;
    d->completeNow           = false;
    d->completionTimer       = new QTimer( this );

    setFocusPolicy( Qt::TabFocus );
    setBackgroundMode( Qt::PaletteButton );
}


/*!
    Constructs a combobox with a maximum size and either Motif 2.0 or
    Windows look and feel.

    The input field can be edited if \a rw is true, otherwise the user
    may only choose one of the items in the combobox.

    The \a parent and \a name arguments are passed on to the QWidget
    constructor.
*/


Q3ComboBox::Q3ComboBox( bool rw, QWidget *parent, const char *name )
    : QWidget( parent, name, Qt::WNoAutoErase )
{
    d = new Q3ComboBoxData( this );
    setUpListBox();

    QStyleOptionComboBox opt = d->getStyleOption();
    if(d->popup() && style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this))
	d->popup()->setItemChecked(d->current, false);
    d->maxCount = INT_MAX;
    setSizeLimit(10);
    d->p = AtBottom;
    d->autoresize = false;
    d->poppedUp = false;
    d->arrowDown = false;
    d->discardNextMousePress = false;
    d->shortClick = false;
    d->useCompletion = false;
    d->completeAt = 0;
    d->completeNow = false;
    d->completionTimer = new QTimer( this );

    setFocusPolicy( Qt::StrongFocus );

    d->ed = 0;
    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;