qtextbrowser.cpp

qtopia-phone-2.2.0下公共的控件实现源代码。

		if ( !d->curhref.isEmpty() )
		    richText().setSelectedAnchor( QString::null, 
					    QtTriple(), QtTriple() );
		setModalEditing( FALSE );
	    } else {
		e->ignore();
	    }
	    return;
	default:
	    if( qt_modalEditingEnabled ) {
		if ( !isModalEditing() ) {
		    e->ignore();
		    return;
		}
	    }
    }
#endif

    if ( e->state() & AltButton ) {
	switch (e->key()) {
	case Key_Right:
	    forward();
	    e->accept();
	    return;
	case Key_Left:
	    backward();
	    e->accept();
	    return;
	case Key_Up:
	    home();
	    e->accept();
	    return;
	}
    }

#ifdef QT_KEYPAD_MODE
    switch( e->key() ) {
	case Key_Right:
	case Key_Down:
	    if ( !selectNextPrevHref( TRUE ) ){
		// scroll the screen down by one page
		QScrollBar *sb = verticalScrollBar(); 
		sb->setValue( sb->value() + (sb->pageStep() >> 1) );
		selectNextPrevHref( TRUE );
	    }
	    e->accept();
	    return;
	case Key_Left:
	case Key_Up:
	    if ( !selectNextPrevHref( FALSE ) ){
		// scroll the screen up by one page
		QScrollBar *sb = verticalScrollBar(); 
		sb->setValue( sb->value() - (sb->pageStep() >> 1) );
		selectNextPrevHref( FALSE );
	    }
	    e->accept();
	    return;
    }
#endif
    QTextView::keyPressEvent(e);
}

/*!
  \e override to press anchors.
*/
void QTextBrowser::viewportMousePressEvent( QMouseEvent* e )
{
    if ( e->button() == LeftButton ) {
	d->buttonDown = anchorAt( e->pos() );
	d->lastClick = e->globalPos();
    }
    QTextView::viewportMousePressEvent( e );
}

/*!
  \e override to activate anchors.
*/
void QTextBrowser::viewportMouseReleaseEvent( QMouseEvent* e )
{
    if ( e->button() == LeftButton ) {
	if ( !d->buttonDown.isEmpty() && anchorAt( e->pos() ) == d->buttonDown ) {
	    setSource( d->buttonDown );
	}
    }
    d->buttonDown = QString::null;
    QTextView::viewportMouseReleaseEvent( e );
}

/*!
  Activate to emit highlighted().
*/
void QTextBrowser::viewportMouseMoveEvent( QMouseEvent* e)
{
#ifndef QT_NO_DRAGANDDROP
    if ( (e->state() & LeftButton) == LeftButton && !d->buttonDown.isEmpty()  ) {
	if ( ( e->globalPos() - d->lastClick ).manhattanLength() > QApplication::startDragDistance() ) {
	    QUrl url ( context(), d->buttonDown, TRUE );
	    QUriDrag* drag = new QUriDrag( this );
	    drag->setUnicodeUris( url.toString() );
	    drag->drag();
	}
	return;
    }
#endif

    if ( e->state() == 0 ) {
	QString act = anchorAt( e->pos() );
	if (d->highlight != act) {
	    if ( !act.isEmpty() ){
		emit highlighted( act );
		d->highlight = act;
	    }
	    else if ( !d->highlight.isEmpty() ) {
		emit highlighted( QString::null );
		d->highlight = QString::null;
	    }
#ifndef QT_NO_CURSOR
	    viewport()->setCursor( d->highlight.isEmpty()?arrowCursor:pointingHandCursor );
#endif
	}
    }

    QTextView::viewportMouseMoveEvent( e );
}


QString QTextBrowser::anchorAt(const QPoint& pos)
{
    return richText().anchorAt( QPoint(contentsX(), contentsY() ) + pos );
}


class QTextDetailPopup : public QWidget
{
public:
    QTextDetailPopup()
	: QWidget ( 0, "automatic QText detail widget", WType_Popup | WDestructiveClose )
	{
	}

protected:

    void mousePressEvent( QMouseEvent*)
	{
	close();
	}
};


void QTextBrowser::popupDetail( const QString& contents, const QPoint& pos )
{

    const int shadowWidth = 6;   // also used as '5' and '6' and even '8' below
    const int vMargin = 8;
    const int hMargin = 12;

    QWidget* popup = new QTextDetailPopup;
    popup->setBackgroundMode( QWidget::NoBackground );

    QSimpleRichText* doc = new QSimpleRichText( contents, popup->font() );
    doc->adjustSize();
    QRect r( 0, 0, doc->width(), doc->height() );

    int w = r.width() + 2*hMargin;
    int h = r.height() + 2*vMargin;

    popup->resize( w + shadowWidth, h + shadowWidth );

    // okay, now to find a suitable location
    //###### we need a global fancy popup positioning somewhere
    popup->move(pos - popup->rect().center());
    if (popup->geometry().right() > QApplication::desktop()->width())
	popup->move( QApplication::desktop()->width() - popup->width(),
		     popup->y() );
    if (popup->geometry().bottom() > QApplication::desktop()->height())
	popup->move( popup->x(),
		     QApplication::desktop()->height() - popup->height() );
    if ( popup->x() < 0 )
	popup->move( 0, popup->y() );
    if ( popup->y() < 0 )
	popup->move( popup->x(), 0 );


    popup->show();

    // now for super-clever shadow stuff.  super-clever mostly in
    // how many window system problems it skirts around.

    QPainter p( popup );
    p.setPen( QApplication::palette().normal().foreground() );
    p.drawRect( 0, 0, w, h );
    p.setPen( QApplication::palette().normal().mid() );
    p.setBrush( QColor( 255, 255, 240 ) );
    p.drawRect( 1, 1, w-2, h-2 );
    p.setPen( black );

    doc->draw( &p, hMargin, vMargin, r, popup->colorGroup(), 0 );
    delete doc;

    p.drawPoint( w + 5, 6 );
    p.drawLine( w + 3, 6,
		w + 5, 8 );
    p.drawLine( w + 1, 6,
		w + 5, 10 );
    int i;
    for( i=7; i < h; i += 2 )
	p.drawLine( w, i,
		    w + 5, i + 5 );
    for( i = w - i + h; i > 6; i -= 2 )
	p.drawLine( i, h,
		    i + 5, h + 5 );
    for( ; i > 0 ; i -= 2 )
	p.drawLine( 6, h + 6 - i,
		    i + 5, h + 5 );
}



/*!
  Scrolls the browser so that the part of the document named
  \a name is at the top of the view (or as close to the top
  as the size of the document allows).
*/
void QTextBrowser::scrollToAnchor(const QString& name)
{
    if ( name.isEmpty() )
	return;

    d->curmark = name;

    QRichTextIterator it( richText() );
    do {
	if ( it.format()->anchorName() == name ) {
	    QTextParagraph* b = it.outmostParagraph();
	    if ( b->dirty ) { // QTextView layouts delayed in the background, so this may happen
		QRichTextFormatter tc( richText() );
		tc.gotoParagraph( 0, &richText() );
		tc.updateLayout();
		resizeContents( QMAX( richText().flow()->widthUsed-1, visibleWidth() ),
				richText().flow()->height );
	    }
	    QRect r = it.lineGeometry();
	    setContentsPos( contentsX(), r.top() );
	    return;
	}
    } while ( it.right( FALSE ) );
}

#ifdef QT_KEYPAD_MODE
/*!
    \Internal
*/
bool QTextBrowser::selectNextPrevHref(bool next)
{
    QRichTextIterator it( richText() );
    bool foundCurrent = d->curhref.isEmpty();
    QString found;
    QtTriple startPos, endPos;
    QtTriple prevprev;
    QString anchor; //, atAnchor;
    QtTriple anchorPos;
    bool anchorBroken = FALSE;
    do {
	anchor = it.format()->anchorHref();
	anchorPos = it.position();
	if ( !anchor.isEmpty() ) { // it's an anchor
	    if ( !next ) {
		//select a previous link
		if (it.position() == d->prevhrefstartpos)  {
		    //at the link before the current
		    // break if previous anchor isn't within the current viewport
		    if ( it.lineGeometry().top() < viewport()->rect().top() + contentsY() )
			break;
		    found  = anchor;
		    startPos = anchorPos;
		    endPos = startPos;
		    it.right( FALSE );
		    while( it.format()->anchorHref().length() )
		    {
			endPos = it.position();
			it.right( FALSE );
		    }
		    d->prevhrefstartpos = prevprev;
		    break;
		} else //if ( anchor != atAnchor ) 
		{
		    //keep track of current link until we get to new current. 
		    // prevprev becomes prev href
		    if( prevprev.isNull() || anchorBroken )
		    {
			//haven't set yet or this is a new link
			prevprev = anchorPos;
			anchorBroken = FALSE;
		    }
		}
	    } else {
		if ( d->curhref.isEmpty() || 
				(foundCurrent && d->curhrefendpos < anchorPos)  ) {
		    //there's no current or we've found the current and this is 
		    //the anchor after it
		    // break if next anchor isn't within the current viewport
		    if ( it.lineGeometry().bottom() >= viewport()->rect().bottom() + contentsY() )
			break;
		    d->prevhrefstartpos = d->curhrefstartpos;
		    found = anchor;
		    startPos = anchorPos;
		    endPos = startPos;
		    it.right( FALSE );
		    while( it.format()->anchorHref().length() )
		    {
			endPos = it.position();
			it.right( FALSE );
		    }
		    break;
		} else if ( !foundCurrent && d->curhrefstartpos == anchorPos ) {
		    foundCurrent = TRUE;
		    //don't set prevpos until we know there's a link after it
		}
	    }
	}
	else
	{
	    //rich text other than an anchor
	    anchorBroken = TRUE;
	}
    } while ( it.right( FALSE ) );

    if ( found.length() ) {
	d->curhref = found;
	d->curhrefstartpos = startPos;
	d->curhrefendpos = endPos;
	richText().setSelectedAnchor( d->curhref, 
						d->curhrefstartpos, d->curhrefendpos );
	
	QTextParagraph* b = it.outmostParagraph();
	if ( b->dirty ) { // QTextView layouts delayed in the background, so this may happen
	    QRichTextFormatter tc( richText() );
	    tc.gotoParagraph( 0, &richText() );
	    tc.updateLayout();
	    resizeContents( QMAX( richText().flow()->widthUsed-1, visibleWidth() ),
			    richText().flow()->height );
	}
	//QRect r = it.lineGeometry();
	//updateContents( r );
	updateContents(0, 0, contentsWidth(), contentsHeight());
	
	// erase previous highlighted link
	if ( next ) {
	    updateContents(0, 0, contentsWidth(), contentsHeight());
	} else {
	    QString tmp = d->curhref;
	    do { 
		if ( it.format()->anchorHref().length() && tmp != it.format()->anchorHref() )
		    break;
	    } while ( it.right( FALSE ) );

	    //updateContents( it.lineGeometry() );
	    updateContents(0, 0, contentsWidth(), contentsHeight());
	}
	
	emit highlighted( d->curhref );
	return TRUE;
    }
    return FALSE;
}

/*
    \Internal
*/
bool QTextBrowser::containsAnchor() const
{
    QRichTextIterator it( richText() );
    do {
	if ( !it.format()->anchorHref().isEmpty() )
	    return TRUE;
    } while ( it.right( FALSE ) );
    return FALSE;
}

#endif

/*!\reimp
 */
void QTextBrowser::showEvent( QShowEvent* e )
{
    QTextView::showEvent( e );
    scrollToAnchor( d->curmark );
}
#endif  // QT_NO_TEXTBROWSER