q3combobox.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

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

void Q3ComboBox::internalHighlight( int index )
{
    emit highlighted( index );
    QString t = text( index );
    if ( !t.isNull() )
	emit highlighted( t );
}

/*!
  \internal
  Receives timeouts after a click. Used to decide if a Motif style
  popup should stay up or not after a click.
*/
void Q3ComboBox::internalClickTimeout()
{
    d->shortClick = false;
}

/*!
    Sets the palette for both the combobox button and the combobox
    popup list to \a palette.
*/

void Q3ComboBox::setPalette( const QPalette &palette )
{
    QWidget::setPalette( palette );
    if ( d->listBox() )
	d->listBox()->setPalette( palette );
    if ( d->popup() )
	d->popup()->setPalette( palette );
}

/*!
    Sets the font for both the combobox button and the combobox popup
    list to \a font.
*/

void Q3ComboBox::setFont( const QFont &font )
{
    d->sizeHint = QSize();		// invalidate size hint
    QWidget::setFont( font );
    if ( d->usingListBox() )
	d->listBox()->setFont( font );
    else
	d->popup()->setFont( font );
    if (d->ed)
	d->ed->setFont( font );
    if ( d->autoresize )
	adjustSize();
}


/*!\reimp
*/

void Q3ComboBox::resizeEvent( QResizeEvent * e )
{
    if ( d->ed )
	d->updateLinedGeometry();
    if ( d->listBox() )
	d->listBox()->resize( width(), d->listBox()->height() );
    QWidget::resizeEvent( e );
}

/*!\reimp
*/

void Q3ComboBox::paintEvent( QPaintEvent * )
{
    QPainter p( this );
    const QColorGroup & g = colorGroup();
    p.setPen(g.text());

    if ( width() < 5 || height() < 5 ) {
	qDrawShadePanel( &p, rect(), g, false, 2,
			 &g.brush( QColorGroup::Button ) );
	return;
    }

    QStyleOptionComboBox opt = d->getStyleOption();
    bool reverse = QApplication::reverseLayout();
    if ( !d->usingListBox() &&
	 style()->styleHint(QStyle::SH_GUIStyle) == Qt::MotifStyle) {			// motif 1.x style
	int dist, buttonH, buttonW;
	dist     = 8;
	buttonH  = 7;
	buttonW  = 11;
	int xPos;
	int x0;
	int w = width() - dist - buttonW - 1;
	if ( reverse ) {
	    xPos = dist + 1;
	    x0 = xPos + 4;
	} else {
	    xPos = w;
	    x0 = 4;
	}
	qDrawShadePanel( &p, rect(), g, false,
			 style()->pixelMetric(QStyle::PM_DefaultFrameWidth, &opt, this),
			 &g.brush( QColorGroup::Button ) );
	qDrawShadePanel( &p, xPos, (height() - buttonH)/2,
			 buttonW, buttonH, g, false,
			 style()->pixelMetric(QStyle::PM_DefaultFrameWidth, &opt, this) );
	QRect clip( x0, 2, w - 2 - 4 - 5, height() - 4 );
	QString str = d->popup()->text( this->d->current );
	if ( !str.isNull() ) {
	    p.drawText( clip, Qt::AlignCenter | Qt::TextSingleLine, str );
	}

	QPixmap pix = d->popup()->pixmap( this->d->current );
	QIcon iconSet = d->popup()->iconSet( this->d->current );
	if (!pix.isNull() || !iconSet.isNull()) {
	    QPixmap pm = ( !pix.isNull() ? pix : iconSet.pixmap() );
	    p.setClipRect( clip );
	    p.drawPixmap( 4, (height()-pm.height())/2, pm );
	    p.setClipping( false );
	}

	if ( hasFocus() )
	    p.drawRect( xPos - 5, 4, width() - xPos + 1 , height() - 8 );
    } else if(!d->usingListBox()) {
	style()->drawComplexControl(QStyle::CC_ComboBox, &opt, &p, this);
        QRect re = style()->subControlRect(QStyle::CC_ComboBox, &opt,
                                           QStyle::SC_ComboBoxEditField, this);
	p.setClipRect( re );

	QString str = d->popup()->text( this->d->current );
	QPixmap pix = d->popup()->pixmap( this->d->current );
	if ( !str.isNull() ) {
	    p.save();
	    p.setFont(font());
	    QFontMetrics fm(font());
	    int x = re.x(), y = re.y() + fm.ascent();
            x += pix.width() + 5;
	    p.drawText( x, y, str );
	    p.restore();
	}
	if (!pix.isNull()) {
	    p.fillRect(re.x(), re.y(), pix.width() + 4, re.height(),
                        colorGroup().brush(QColorGroup::Base));
	    p.drawPixmap(re.x() + 2, re.y() + (re.height() - pix.height()) / 2, pix);
	}
    } else {
	style()->drawComplexControl(QStyle::CC_ComboBox, &opt, &p, this);
	QRect re = style()->subControlRect(QStyle::CC_ComboBox, &opt,
                                            QStyle::SC_ComboBoxEditField, this);
	p.setClipRect(re);

	if ( !d->ed ) {
	    Q3ListBoxItem * item = d->listBox()->item( d->current );
	    if ( item ) {
		int itemh = item->height( d->listBox() );
		p.translate( re.x(), re.y() + (re.height() - itemh)/2  );
		item->paint( &p );
	    }
	} else if ( d->listBox() && d->listBox()->item( d->current ) ) {
	    Q3ListBoxItem * item = d->listBox()->item( d->current );
	    const QPixmap *pix = item->pixmap();
	    if ( pix ) {
		p.fillRect( re.x(), re.y(), pix->width() + 4, re.height(),
			    colorGroup().brush( QColorGroup::Base ) );
		p.drawPixmap( re.x() + 2, re.y() +
			      ( re.height() - pix->height() ) / 2, *pix );
	    }
	}
	p.setClipping( false );
    }
}


/*!\reimp
*/

void Q3ComboBox::mousePressEvent( QMouseEvent *e )
{
    if ( e->button() != Qt::LeftButton )
	return;
    if ( d->discardNextMousePress ) {
	d->discardNextMousePress = false;
	return;
    }

    QStyleOptionComboBox opt = d->getStyleOption();
    QRect arrowRect = style()->subControlRect(QStyle::CC_ComboBox, &opt, QStyle::SC_ComboBoxArrow
                                               , this);

    // Correction for motif style, where arrow is smaller
    // and thus has a rect that doesn't fit the button.
    arrowRect.setHeight( QMAX(  height() - (2 * arrowRect.y()), arrowRect.height() ) );

    if ( count() && ( !editable() || arrowRect.contains( e->pos() ) ) ) {
	d->arrowPressed = false;

	if ( d->usingListBox() ) {
	    listBox()->blockSignals( true );
	    qApp->sendEvent( listBox(), e ); // trigger the listbox's autoscroll
	    listBox()->setCurrentItem(d->current);
	    listBox()->blockSignals( false );
	    popup();
	    if ( arrowRect.contains( e->pos() ) ) {
		d->arrowPressed = true;
		d->arrowDown    = true;
		repaint( false );
	    }
	} else {
	    popup();
	}
	QTimer::singleShot( 200, this, SLOT(internalClickTimeout()));
	d->shortClick = true;
    }
}

/*!\reimp
*/

void Q3ComboBox::mouseMoveEvent( QMouseEvent * )
{
}

/*!\reimp
*/

void Q3ComboBox::mouseReleaseEvent( QMouseEvent * )
{
}

/*!\reimp
*/

void Q3ComboBox::mouseDoubleClickEvent( QMouseEvent *e )
{
    mousePressEvent( e );
}


/*!\reimp
*/

void Q3ComboBox::keyPressEvent( QKeyEvent *e )
{
    int c = currentItem();
    if ( ( e->key() == Qt::Key_F4 && e->state() == 0 ) ||
	 ( e->key() == Qt::Key_Down && (e->state() & Qt::AltModifier) ) ||
	 ( !d->ed && e->key() == Qt::Key_Space ) ) {
	if ( count() ) {
	    if ( !d->usingListBox() )
		d->popup()->setActiveItem( this->d->current );
	    popup();
	}
	return;
    } else if ( d->usingListBox() && e->key() == Qt::Key_Up ) {
	if ( c > 0 )
	    setCurrentItem( c-1 );
    } else if ( d->usingListBox() && e->key() == Qt::Key_Down ) {
	if ( ++c < count() )
	    setCurrentItem( c );
    } else if ( d->usingListBox() && e->key() == Qt::Key_Home && ( !d->ed || !d->ed->hasFocus() ) ) {
	setCurrentItem( 0 );
    } else if ( d->usingListBox() && e->key() == Qt::Key_End && ( !d->ed || !d->ed->hasFocus() ) ) {
	setCurrentItem( count()-1 );
    } else if ( !d->ed && e->ascii() >= 32 && !e->text().isEmpty() ) {
	if ( !d->completionTimer->isActive() ) {
	    d->completeAt = 0;
	    c = completionIndex( e->text(), ++c );
	    if ( c >= 0 ) {
		setCurrentItem( c );
		d->completeAt = e->text().length();
	    }
	} else {
	    d->completionTimer->stop();
	    QString ct = currentText().left( d->completeAt ) + e->text();
	    c = completionIndex( ct, c );
	    if ( c < 0 && d->completeAt > 0 ) {
		c = completionIndex( e->text(), 0 );
		ct = e->text();
	    }
	    d->completeAt = 0;
	    if ( c >= 0 ) {
		setCurrentItem( c );
		d->completeAt = ct.length();
	    }
	}
	d->completionTimer->start( 400, true );
    } else {
	e->ignore();
	return;
    }

    c = currentItem();
    if ( count() && !text( c ).isNull() )
	emit activated( text( c ) );
    emit activated( c );
}


/*!\reimp
*/

void Q3ComboBox::focusInEvent( QFocusEvent * e )
{
    QWidget::focusInEvent( e );
    d->completeNow = false;
    d->completeAt = 0;
}

/*!\reimp
*/

void Q3ComboBox::focusOutEvent( QFocusEvent * e )
{
    QWidget::focusOutEvent( e );
    d->completeNow = false;
    d->completeAt = 0;
}

/*!\reimp
*/
#ifndef QT_NO_WHEELEVENT
void Q3ComboBox::wheelEvent( QWheelEvent *e )
{
    if ( d->poppedUp ) {
	if ( d->usingListBox() ) {
	    QApplication::sendEvent( d->listBox(), e );
	}
    } else {
	if ( e->delta() > 0 ) {
	    int c = currentItem();
	    if ( c > 0 ) {
		setCurrentItem( c-1 );
		emit activated( currentItem() );
		emit activated( currentText() );
	    }
	} else {
	    int c = currentItem();
	    if ( ++c < count() ) {
		setCurrentItem( c );
		emit activated( currentItem() );
		emit activated( currentText() );
	    }
	}
	e->accept();
    }
}
#endif

/*!
  \internal
   Calculates the listbox height needed to contain all items, or as
   many as the list box is supposed to contain.
*/
static int listHeight( Q3ListBox *l, int sl )
{
    if ( l->count() > 0 )
	return QMIN( l->count(), (uint)sl) * l->item( 0 )->height(l);
    else
	return l->sizeHint().height();
}


/*!
    Pops up the combobox popup list.

    If the list is empty, no items appear.
*/

void Q3ComboBox::popup()
{
    if ( !count() || d->poppedUp )
	return;

    QStyleOptionComboBox opt = d->getStyleOption();
    if( !d->usingListBox() || style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this) ) {
	if(d->usingListBox()) {
	    if(!d->popup()) {
		Q3ComboBoxPopup *p = new Q3ComboBoxPopup( this, "in-combo" );
		d->setPopupMenu( p, false );
		p->setFont( font() );
		connect( p, SIGNAL(activated(int)), SLOT(internalActivate(int)) );
		connect( p, SIGNAL(highlighted(int)), SLOT(internalHighlight(int)) );
	    }
	    d->popup()->clear();
	    for(unsigned int i = 0; i < d->listBox()->count(); i++) {
		Q3ListBoxItem *item = d->listBox()->item(i);
		if(item->rtti() == Q3ListBoxText::RTTI) {
		    d->popup()->insertItem(escapedComboString(item->text()), i, i);
		} else if(item->rtti() == Q3ListBoxPixmap::RTTI) {
		    if(item->pixmap())
			d->popup()->insertItem(QIcon(*item->pixmap()), escapedComboString(item->text()), i, i);
		    else
			d->popup()->insertItem(escapedComboString(item->text()), i, i);
		} else {
		    d->popup()->insertItem(new Q3ComboBoxPopupItem(item), i, i);
		}
	    }
	}
	d->popup()->installEventFilter( this );
	if(d->popup() && style()->styleHint(QStyle::SH_ComboBox_Popup, &opt, this))
	    d->popup()->setItemChecked(this->d->current, true);
	d->popup()->popup( mapToGlobal( QPoint(0,0) ), this->d->current );
	update();
    } else {
	// Send all listbox events to eventFilter():
	Q3ListBox* lb = d->listBox();
	lb->triggerUpdate( true );
	lb->installEventFilter( this );
	d->mouseWasInsidePopup = false;
	int w = lb->variableWidth() ? lb->sizeHint().width() : width();
	int h = listHeight( lb, d->sizeLimit ) + 2;
	QRect screen = QApplication::desktop()->availableGeometry( this );

	int sx = screen.x();				// screen pos
	int sy = screen.y();
	int sw = screen.width();			// screen width
	int sh = screen.height();			// screen height
	QPoint pos = mapToGlobal( QPoint(0,height()) );
	// ## Similar code is in QPopupMenu
	int x = pos.x();
	int y = pos.y();

	// the complete widget must be visible
	if ( x + w > sx + sw )
	    x = sx+sw - w;
	if ( x < sx )
	    x = sx;
	if (y + h > sy+sh && y - h - height() >= 0 )
	    y = y - h - height();

        opt.rect = QRect(x, y, w, h);
       	QRect rect = style()->subControlRect(QStyle::CC_ComboBox, &opt,
                                             QStyle::SC_ComboBoxListBoxPopup, this);

	// work around older styles that don't implement the combobox
	// listbox popup subcontrol
	if ( rect.isNull() )
	    rect.setRect( x, y, w, h );
	lb->setGeometry( rect );

	lb->raise();
	bool block = lb->signalsBlocked();
	lb->blockSignals( true );
	Q3ListBoxItem* currentLBItem = 0;
	if ( editable() && currentText() != text( currentItem() ) )
	    currentLBItem = lb->findItem( currentText() );

	currentLBItem = currentLBItem ? currentLBItem : lb->item( d->current );

	lb->setCurrentItem( currentLBItem );
	lb->setContentsPos( lb->contentsX(),
			    lb->viewportToContents( lb->itemRect( currentLBItem ).topLeft() ).y() );

	// set the current item to also be the selected item if it isn't already
	if ( currentLBItem && currentLBItem->isSelectable() && !currentLBItem->isSelected() )
	    lb->setSelected( currentLBItem, true );
	lb->blockSignals( block );
	lb->setVScrollBarMode(Q3ScrollView::Auto);

#ifndef QT_NO_EFFECTS
	if ( QApplication::isEffectEnabled( Qt::UI_AnimateCombo ) ) {
	    if ( lb->y() < mapToGlobal(QPoint(0,0)).y() )
		qScrollEffect( lb, QEffects::UpScroll );
	    else
		qScrollEffect( lb );
	} else
#endif
	    lb->show();
    }
    d->poppedUp = true;
}


/*!
  Updates the widget mask.

  \sa QWidget::setMask()
*/
void Q3ComboBox::updateMask()
{
    QBitmap bm( size() );
    bm.fill( Qt::color0 );

    QStyleOptionComboBox opt = d->getStyleOption();
    {
	QPainter p(&bm);
        p.initFrom(this);
        p.fillRect(opt.rect, Qt::color1); // qcommonstyle old drawComplexControl implementation
    }

    setMask( bm );
}

/*!
  \internal
  Pops down (removes) the combobox popup list box.
*/
void Q3ComboBox::popDownListBox()
{
    Q_ASSERT( d->usingListBox() );
    d->listBox()->removeEventFilter( this );
    d->listBox()->viewport()->removeEventFilter( this );
    d->listBox()->hide();
    d->listBox()->setCurrentItem( d->current );
    if ( d->arrowDown ) {
	d->arrowDown = false;
	repaint( false );
    }
    d->poppedUp = false;
}


/*!
  \internal
  Re-indexes the identifiers in the popup list.
*/

void Q3ComboBox::reIndex()
{
    if ( !d->usingListBox() ) {
	int cnt = count();
	while ( cnt-- )
	    d->popup()->setId( cnt, cnt );
    }
}

/*!
  \internal
  Repaints the combobox.
*/

void Q3ComboBox::currentChanged()
{
    if ( d->autoresize )
	adjustSize();
    update();

#if defined(QT_ACCESSIBILITY_SUPPORT)
    QAccessible::updateAccessibility( this, 0, QAccessible::ValueChanged );
#endif
}

/*! \reimp

  \internal

  The event filter steals events from the popup or listbox when they
  are popped up. It makes the popup stay up after a short click in
  motif style. In windows style it toggles the arrow button of the
  combobox field, and activates an item and takes down the listbox
  when the mouse button is released.
*/

bool Q3ComboBox::eventFilter( QObject *object, QEvent *event )
{
    QStyleOptionComboBox opt = d->getStyleOption();
    if ( !event )
	return true;
    else if ( object == d->ed ) {
	if ( event->type() == QEvent::KeyPress ) {
	    bool isAccepted = ( (QKeyEvent*)event )->isAccepted();
	    keyPressEvent( (QKeyEvent *)event );
	    if ( ((QKeyEvent *)event)->isAccepted() ) {
		d->completeNow = false;
		return true;
	    } else if ( ((QKeyEvent *)event)->key() != Qt::Key_End ) {
		d->completeNow = true;
		d->completeAt = d->ed->cursorPosition();
	    }
	    if ( isAccepted )
		( (QKeyEvent*)event )->accept();
	    else
		( (QKeyEvent*)event )->ignore();
	} else if ( event->type() == QEvent::KeyRelease ) {
	    keyReleaseEvent( (QKeyEvent *)event );
	    return ((QKeyEvent *)event)->isAccepted();
	} else if ( event->type() == QEvent::FocusIn ) {
	    focusInEvent( (QFocusEvent *)event );
	} else if ( event->type() == QEvent::FocusOut ) {
	    focusOutEvent( (QFocusEvent *)event );