qtextview.cpp

qtopia-phone-2.2.0下公共的控件实现源代码。

    QFontMetrics fm( p->fontMetrics() );
    while ( b && tc.y() <= cy + ch ) {

	if ( b && b->dirty ) //ensure the paragraph is laid out
	    tc.updateLayout( p, cy + ch );

	tc.gotoParagraph( p, b );

	if ( tc.y() + tc.paragraph->height > cy ) {
	    do {
		tc.makeLineLayout( p );
		QRect geom( tc.lineGeometry() );
		if ( geom.bottom() > cy && geom.top() < cy+ch )
		    tc.drawLine( p, ox, oy, cx, cy, cw, ch, r, paperColorGroup(), to );
	    }
	    while ( tc.gotoNextLine( p ) );
	}
	b = b->nextInDocument();
    }

    to.selstart = QtTriple();
    to.selstart = to.selend;
    richText().flow()->drawFloatingItems( p, ox, oy, cx, cy, cw, ch, r, paperColorGroup(), to );

    p->setClipRegion(r);

    if ( paper().pixmap() && !testWState(WState_GlobalBrushOrigin) )
	p->drawTiledPixmap(0, 0, visibleWidth(), visibleHeight(),
			   *paper().pixmap(), ox, oy);
    else
	p->fillRect(0, 0, visibleWidth(), visibleHeight(), paper() );

    p->setClipping( FALSE );

#if 0
    int pagesize = richText().flow()->pagesize;
    if ( pagesize > 0 ) {
	p->setPen( DotLine );
	for (int page = cy / pagesize; page <= (cy+ch) / pagesize; ++page ) {
	    p->drawLine( cx-ox, page * pagesize - oy, cx-ox+cw, page*
			 pagesize - oy );
	}
    }
#endif

}

/*!
  \reimp
*/
void QTextView::viewportResizeEvent(QResizeEvent* )
{
}

void QTextView::doResize()
{
    if ( !d->fcresize->updateLayout( 0, d->fcresize->y() + d->fcresize->paragraph->height + 1000 ) )
	d->resizeTimer->start( 0, TRUE );
    QTextFlow* flow = richText().flow();
    resizeContents( QMAX( flow->widthUsed-1, visibleWidth() ), flow->height );
}

/*!
  \reimp
*/
void QTextView::resizeEvent( QResizeEvent* e )
{
    if ( e->size().width() == e->oldSize().width() ) {
	int vw = visibleWidth();
	QScrollView::resizeEvent( e );
	if ( vw == visibleWidth() )
	    return;
    } else {
	setUpdatesEnabled( FALSE ); // to hinder qscrollview from showing/hiding scrollbars. Safe since we call resizeContents later!
	QScrollView::resizeEvent( e );
	setUpdatesEnabled( TRUE);
    }
    richText().invalidateLayout();
    richText().flow()->initialize( visibleWidth() );
    updateLayout();
}


/*!
  \reimp
*/
void QTextView::viewportMousePressEvent( QMouseEvent* e )
{
    if ( e->button() != LeftButton )
	return;
#ifdef QT_KEYPAD_MODE
    if( qt_modalEditingEnabled ) {
	if ( !isModalEditing() )
	    setModalEditing( TRUE );
    }
#endif
    d->cursor = e->pos() + QPoint( contentsX(), contentsY() );
    QRichTextIterator it( richText() );
    bool within = it.goTo( d->cursor );
    bool sel = d->selection && it.position() >= d->selstart && it.position() < d->selend;
    if ( !sel || !within ) {
	clearSelection();
	d->selorigin = it.position();
	d->selstart = d->selorigin;
	d->selend = d->selstart;
	d->dragselection = TRUE;
#ifndef QT_NO_DRAGANDDROP
    } else {
	d->dragTimer->start( QApplication::startDragTime(), TRUE );
#endif
    }
}

/*!
  \reimp
*/
void QTextView::viewportMouseReleaseEvent( QMouseEvent* e )
{
    if ( e->button() == LeftButton ) {
	d->scrollTimer->stop();
#ifndef QT_NO_CLIPBOARD
	if ( d->dragselection ) {
#if defined(_WS_X11_)
	    if ( style() == MotifStyle )
		copy();
#endif
	    d->dragselection = FALSE;
	} else
#endif
	{
	    clearSelection();
	}
    }
}



/*!  Returns TRUE if there is any text selected, FALSE otherwise.

  \sa selectedText()
*/
bool QTextView::hasSelectedText() const
{
    return d->selection;
}

/*!  Returns a copy of the selected text in plain text format.

  \sa hasSelectedText()
*/
QString QTextView::selectedText() const
{
    if ( !d->selection )
	return QString::null;

    QRichTextIterator it( richText() );
    it.goTo( d->selstart );

    if ( d->selstart.a == d->selend.a && d->selstart.b == d->selend.b )
	return it.text().mid( d->selstart.c, d->selend.c - d->selstart.c );

    int column = 0;
    QString txt;
    QString s = it.text().mid( d->selstart.c );
    while ( it.position() < d->selend ) {
	if ( !s.isEmpty() ) {
	    if ( column + s.length() > 79 &&
		it.outmostParagraph()->style->whiteSpaceMode() == QStyleSheetItem::WhiteSpaceNormal ) {
		txt += '\n';
		column = 0;
	    }
	    if ( s[(int)s.length()-1]== '\n' )
		column = 0;
	    txt += s;
	    column += s.length();
	}
	int oldpar = it.position().a;
	if ( !it.right( FALSE ) )
	    break;
	if ( it.position().a != oldpar ) {
	    txt += '\n';
	    column = 0;
	}
	s = it.text();
	if ( it.position().a == d->selend.a && it.position().b == d->selend.b )
	    s = s.left( d->selend.c );
    }
    return txt;
}

static int logicalFontSize( QStyleSheet* style, QFont base, int pt )
{
    for (int i=0; i<10; i++) {
	QFont b = base;
	style->scaleFont(b,i);
	if ( b.pointSize() >= pt )
	    return i;
    }
    return 1; // else what?
}

static QString formatDiff(const QTextView* view, QTextCharFormat* pfmt, QTextCharFormat* nfmt)
{
    QString txt;
    QFont basefont = view->font();
    if ( pfmt != nfmt ) {
	QString t,pre,post;
	if ( pfmt->color() != nfmt->color() ) {
	    QString c;
	    t += c.sprintf("color=#%06x ", nfmt->color().rgb());
	}
	if ( pfmt->font() != nfmt->font() ) {
	    int plsz = logicalFontSize( view->styleSheet(), basefont, pfmt->font().pointSize() );
	    int nlsz = logicalFontSize( view->styleSheet(), basefont, nfmt->font().pointSize() );
	    if ( nlsz != plsz ) {
		QString f;
		t += f.sprintf("size=%d ",nlsz-plsz);
	    }
	    if ( pfmt->font().family() != nfmt->font().family() ) {
		t += "face=";
		t += nfmt->font().family();
		t += " ";
	    }
	    if ( pfmt->font().italic() != nfmt->font().italic() ) {
		bool on = nfmt->font().italic();
		if ( on )
		    post = post + "<i>";
		else
		    pre = "</i>" + pre;
	    }
	    if ( pfmt->font().weight() != nfmt->font().weight() ) {
		bool on = nfmt->font().weight() > 50;
		if ( on )
		    post = post + "<b>";
		else
		    pre = "</b>" + pre;
	    }
	}
	txt += pre;
	if ( !t.isEmpty() ) {
	    t.truncate(t.length()-1); // chop space
	    txt += "<font " + t + ">";
	}
	txt += post;
    }
    return txt;
}

/*!  Returns a copy of the selected text in rich text format (XML).

  \sa hasSelectedText()
*/
QString QTextView::selectedRichTextInternal() const
{
    if ( !d->selection )
	return QString::null;

    QRichTextIterator it( richText() );
    it.goTo( d->selstart );
    QString txt;
    QString s = it.text().mid( d->selstart.c );
    QTextCharFormat ifmt;
    QTextCharFormat* pfmt = &ifmt;
    while ( it.position() < d->selend ) {
	QTextCharFormat* nfmt = it.format();
	txt += formatDiff(this,pfmt,nfmt);
	pfmt = nfmt;
	txt += s;
	int oldpar = it.position().a;
	if ( !it.right( FALSE ) )
	    break;
	if ( it.position().a != oldpar )
	    txt += "</p><p>";
	s = it.text();
	if ( it.position().a == d->selend.a && it.position().b == d->selend.b )
	    s = s.left( d->selend.c );
    }
    txt += formatDiff(this,pfmt,&ifmt);
    return txt;
}

#ifndef QT_NO_CLIPBOARD
/*!
  Copies the marked text to the clipboard.
*/
void QTextView::copy()
{
#if defined(_WS_X11_)
    disconnect( QApplication::clipboard(), SIGNAL(dataChanged()), this, 0);
#endif
    QString t = selectedText();
    QRegExp nbsp(QChar(0x00a0U));
    t.replace( nbsp, " " );
#if defined(_OS_WIN32_)
    // Need to convert NL to CRLF
    QRegExp nl("\\n");
    t.replace( nl, "\r\n" );
#endif
    QApplication::clipboard()->setText( t );
#if defined(_WS_X11_)
    connect( QApplication::clipboard(), SIGNAL(dataChanged()),
	     this, SLOT(clipboardChanged()) );
#endif
}
#endif

/*!
  Selects all text.
*/
void QTextView::selectAll()
{
    QRichTextIterator it( richText() );
    d->selstart = it.position();
    while ( it.right( FALSE ) ) { }
    d->selend = it.position();
    viewport()->update();
    d->selection = TRUE;
#if defined(_WS_X11_)
    copy();
#endif
}

/*!
  \reimp
*/
void QTextView::viewportMouseMoveEvent( QMouseEvent* e)
{
    if (e->state() & LeftButton ) {
	if (d->dragselection ) {
	    doSelection( e->pos() );
	    ensureVisible( d->cursor.x(), d->cursor.y() );
#ifndef QT_NO_DRAGANDDROP
	} else if ( d->dragTimer->isActive() ) {
	    d->dragTimer->stop();
	    doStartDrag();
#endif
	}
    }
}

/*!
  Provides scrolling and paging.
*/
void QTextView::keyPressEvent( QKeyEvent * e)
{
#ifdef QT_KEYPAD_MODE
    switch( e->key() ) {
	case Key_Select:
	    if( qt_modalEditingEnabled ) {
		setModalEditing( !isModalEditing() );
	    }
	    return;
	case Key_Back:
	case Key_No:
	    if ( qt_modalEditingEnabled && isModalEditing() ) {
		setModalEditing( FALSE );
	    } else {
		e->ignore();
	    }
	    return;
	default:
	    if( qt_modalEditingEnabled ) {
		if ( !isModalEditing() ) {
		    e->ignore();
		    return;
		}
	    }
    }
#endif

    int unknown = 0;
    switch (e->key()) {
    case Key_Right:
	scrollBy( 10, 0 );
	break;
    case Key_Left:
	scrollBy( -10, 0 );
	break;
    case Key_Up:
	scrollBy( 0, -10 );
	break;
    case Key_Down:
	scrollBy( 0, 10 );
	break;
    case Key_Home:
	setContentsPos(0,0);
	break;
    case Key_End:
	setContentsPos(0,contentsHeight()-visibleHeight());
	break;
    case Key_PageUp:
	scrollBy( 0, -visibleHeight() );
	break;
    case Key_PageDown:
	scrollBy( 0, visibleHeight() );
	break;
#ifndef QT_NO_CLIPBOARD
    case Key_F16: // Copy key on Sun keyboards
	copy();
	break;
#if defined (_WS_WIN_)
    case Key_Insert:
#endif
    case Key_C:
	if ( e->state() & ControlButton )
	    copy();
	break;
#endif
    default:
	unknown++;
    }
    if ( unknown )				// unknown key
	e->ignore();
}

/*!
  \reimp
*/
void QTextView::paletteChange( const QPalette & p )
{
    QScrollView::paletteChange( p );
    if ( !d->ownpalette ) {
	d->mypapcolgrp = palette().active();
	d->papcolgrp = d->mypapcolgrp;
    }
}


/*!
  Returns the current text format.

  \sa setTextFormat()
 */
Qt::TextFormat QTextView::textFormat() const
{
    return d->textformat;
}

/*!
  Sets the text format to \a format. Possible choices are
  <ul>
  <li> \c PlainText - all characters are displayed verbatim,
  including all blanks and linebreaks.
  <li> \c RichText - rich text rendering. The available
  styles are defined in the default stylesheet
  QStyleSheet::defaultSheet().
  <li> \c AutoText - this is also the default. The label
  autodetects which rendering style suits best, \c PlainText
  or \c RichText. Technically, this is done by using the
  QStyleSheet::mightBeRichText() heuristic.
  </ul>
 */
void QTextView::setTextFormat( Qt::TextFormat format )
{
    d->textformat = format;
    setText( d->original_txt, d->contxt ); // trigger update
}


/*!\internal
 */
void QTextView::updateLayout()
{
    if ( !isVisible() ) {
	d->dirty = TRUE;
	return;
    }

    QSize cs( viewportSize( contentsWidth(), contentsHeight() ) );
    int ymax = contentsY() + cs.height() + 1;

    delete d->fcresize;
    d->fcresize = new QRichTextFormatter( richText() );
    d->fcresize->initParagraph( 0, &richText() );
    d->fcresize->updateLayout( 0, ymax );

    QTextFlow* flow = richText().flow();
    QSize vs( viewportSize( flow->widthUsed, flow->height ) );

    // This condition is wrong. See Qtopia bug 2271 (among others).
    //if ( vs.width() != visibleWidth() ) {
	flow->initialize( vs.width() );
	richText().invalidateLayout();
	d->fcresize->gotoParagraph( 0, &richText() );
	d->fcresize->updateLayout( 0, ymax );
    //}

    resizeContents( QMAX( flow->widthUsed-1, vs.width() ), flow->height );
    d->resizeTimer->start( 0, TRUE );
    d->dirty = FALSE;
}


/*!\reimp
 */
void QTextView::showEvent( QShowEvent* )
{
    if ( d->dirty )
	updateLayout();
}

void QTextView::clearSelection()
{
#ifndef QT_NO_DRAGANDDROP
    d->dragTimer->stop();
#endif
    if ( !d->selection )
	return; // nothing to do
    d->selection = FALSE;
    QRichTextIterator it( richText() );
    it.goTo( d->selend );
    int y = it.lineGeometry().bottom();
    it.goTo( d->selstart );
    if ( y - it.lineGeometry().top()  >= visibleHeight() )
	viewport()->update();
    else {
	QRect r = it.lineGeometry();
	while ( it.position() < d->selend && it.right() ) {
	    r = r.unite( it.lineGeometry() );
	}
	updateContents( r );
    }
}

#ifndef QT_NO_DRAGANDDROP
void QTextView::doStartDrag()
{
    QTextDrag* drag = new QTextDrag( selectedText(), this ) ;
    drag->drag();
}
#endif

void QTextView::doAutoScroll()
{
    QPoint pos = viewport()->mapFromGlobal( QCursor::pos() );
    if ( pos.y() < 0 )
	scrollBy( 0, -32 );
    else if (pos.y() > visibleHeight() )
	scrollBy( 0, 32 );
    doSelection( pos );
}

void QTextView::doSelection( const QPoint& pos )
{
    QPoint to( pos + QPoint( contentsX(), contentsY()  ) );
    if ( to != d->cursor ) {
	QRichTextIterator it( richText() );
	it.goTo( to );
	d->selection = TRUE;
	if ( (it.position() != d->selstart) && (it.position()  != d->selend) ) {
	    if ( it.position() < d->selorigin ) {
		d->selstart = it.position();
		d->selend = d->selorigin;
	    } else {
		d->selstart = d->selorigin;
		d->selend = it.position();
	    }
	    QRichTextIterator it2( richText() );
	    it2.goTo( d->cursor );
	    QRect r = it2.lineGeometry();
	    r = r.unite( it.lineGeometry() );
	    while ( it.position() < it2.position() && it.right( FALSE ) )
		r = r.unite( it.lineGeometry() );
	    while ( it2.position() < it.position() && it2.right( FALSE ) )
		r = r.unite( it2.lineGeometry() );
	    d->cursor = to;
	    repaintContents( r, FALSE );
	}
    }

    if ( pos.y() < 0 || pos.y() > visibleHeight() )
	d->scrollTimer->start( 100, FALSE );
    else
	d->scrollTimer->stop();
}

void QTextView::clipboardChanged()
{
#if defined(_WS_X11_)
    disconnect( QApplication::clipboard(), SIGNAL(dataChanged()),
		this, SLOT(clipboardChanged()) );
    clearSelection();
#endif
}

/*!\reimp
 */
void QTextView::focusInEvent( QFocusEvent * )
{
    setMicroFocusHint(width()/2, 0, 1, height(), FALSE);
}

/*!\reimp
 */
void QTextView::focusOutEvent( QFocusEvent * )
{
}

#endif  // QT_NO_TEXTVIEW