qmultilineedit.cpp

基于qt2的电子书

	int id[ (int)IdCount ];
	id[ IdUndo ] = popup->insertItem( tr( "Undo" ) );
	id[ IdRedo ] = popup->insertItem( tr( "Redo" ) );
	popup->insertSeparator();
#ifndef QT_NO_CLIPBOARD
	id[ IdCut ] = popup->insertItem( tr( "Cut" ) );
	id[ IdCopy ] = popup->insertItem( tr( "Copy" ) );
	id[ IdPaste ] = popup->insertItem( tr( "Paste" ) );
#ifndef QT_NO_MIMECLIPBOARD
	id[ IdPasteSpecial ] = popup->insertItem( tr( "Paste special..." ) );
#endif
#endif
	id[ IdClear ] = popup->insertItem( tr( "Clear" ) );
	popup->insertSeparator();
	id[ IdSelectAll ] = popup->insertItem( tr( "Select All" ) );
	popup->setItemEnabled( id[ IdUndo ],
				  !this->d->undoList.isEmpty() );
	popup->setItemEnabled( id[ IdRedo ],
				  !this->d->redoList.isEmpty() );
#ifndef QT_NO_CLIPBOARD
	popup->setItemEnabled( id[ IdCut ],
			          !isReadOnly() && hasMarkedText() );
	popup->setItemEnabled( id[ IdCopy ], hasMarkedText() );
	popup->setItemEnabled( id[ IdPaste ],
	    !isReadOnly() && (bool)QApplication::clipboard()->text().length() );
#ifndef QT_NO_MIMECLIPBOARD
	// Any non-plain types?
	QMimeSource* ms = QApplication::clipboard()->data();
	bool ps = FALSE;
	if ( ms )  {
	    if ( !isReadOnly() ) {
		const char* fmt;
		for (int i=0; !ps && (fmt=ms->format(i)); i++) {
		    ps = qstrnicmp(fmt,"text/",5)==0
		      && qstrnicmp(fmt+5,"plain",5)!=0;
		}
	    }
	}
	popup->setItemEnabled( id[ IdPasteSpecial ], ps );
#endif
#endif
	popup->setItemEnabled( id[ IdClear ],
				  !isReadOnly() && (bool)text().length() );
	int allSelected = markIsOn && markAnchorX == 0 && markAnchorY == 0 &&
			  markDragY == numLines() - 1 && markDragX == lineLength( markDragY );
	popup->setItemEnabled( id[ IdSelectAll ],
				  (bool)text().length() && !allSelected );

	int r = popup->exec( e->globalPos() );
	delete popup;

	if ( r == id[ IdUndo ] )
	    undo();
	else if ( r == id[ IdRedo ] )
	    redo();
#ifndef QT_NO_CLIPBOARD
	else if ( r == id[ IdCut ] )
	    cut();
	else if ( r == id[ IdCopy ] )
	    copy();
	else if ( r == id[ IdPaste ] )
	    paste();
# ifndef QT_NO_MIMECLIPBOARD
	else if ( r == id[ IdPasteSpecial ] )
	    pasteSpecial(QCursor::pos());
# endif
#endif
	else if ( r == id[ IdClear ] )
	    clear();
	else if ( r == id[ IdSelectAll ] )
	    selectAll();
	return;
    }

    if ( e->button() != MidButton && e->button() != LeftButton)
	return;

    int newX, newY;
    pixelPosToCursorPos( e->pos(), &newX, &newY );

    if ( e->state() & ShiftButton ) {
	wordMark = FALSE;
	dragMarking    = TRUE;
	setCursorPosition( newY, newX, TRUE);
	return;
    }

#ifndef QT_NO_DRAGANDDROP
    if (
	inMark(newX, newY)		// Click on highlighted text
	&& echoMode() == Normal		// No DnD of passwords, etc.
	&& e->pos().y() < totalHeight() // Click past the end is not dragging
	)
    {
	// The user might be trying to drag
	d->dnd_primed = TRUE;
	d->dnd_timer->start( QApplication::startDragTime(), FALSE );
    } else
#endif
    {
	wordMark = FALSE;
	dragMarking    = TRUE;
	setCursorPixelPosition(e->pos());
    }
}

void QMultiLineEdit::pixelPosToCursorPos(QPoint p, int* x, int* y) const
{
    *y = findRow( p.y() );
    if ( *y < 0 ) {
	if ( p.y() < lineWidth() ) {
	    *y = topCell();
	} else {
	    *y = lastRowVisible();
	    p.setX(cellWidth());
	}
    }
    *y = QMIN( (int)contents->count() - 1, *y );
    QFontMetrics fm( font() );
    *x = xPosToCursorPos( stringShown( *y ), fm,
			  p.x() - d->lr_marg + xOffset(),
			  cellWidth() - 2 * d->lr_marg - d->marg_extra,
			  d->align );
    QMultiLineEditRow* r = contents->at( *y );
    if (r && !r->newline && ((unsigned int)*x == r->s.length()) && (*x > 0))
	--*x;
}

void QMultiLineEdit::setCursorPixelPosition(QPoint p, bool clear_mark)
{
    int newY;
    pixelPosToCursorPos( p, &cursorX, &newY );
    curXPos        = 0;
    if ( clear_mark ) {
	markAnchorX    = cursorX;
	markAnchorY    = newY;
	bool markWasOn = markIsOn;
	turnMark( FALSE );
	if ( markWasOn ) {
	    cursorY = newY;
	    update();
	    d->isHandlingEvent = FALSE;
	    return;
	}
    }
    if ( cursorY != newY ) {
	int oldY = cursorY;
	cursorY = newY;
	updateCell( oldY, 0, FALSE );
    }
    updateCell( cursorY, 0, FALSE );		// ###
}

void QMultiLineEdit::startAutoScroll()
{
    if ( !dragScrolling ) {
	d->scrollTime = initialScrollTime;
	d->scrollAccel = initialScrollAccel;
	d->scrollTimer->start( d->scrollTime, FALSE );
	dragScrolling = TRUE;
    }
}

void QMultiLineEdit::stopAutoScroll()
{
    if ( dragScrolling ) {
	d->scrollTimer->stop();
	dragScrolling = FALSE;
    }
}

/*!\reimp
*/
void QMultiLineEdit::mouseMoveEvent( QMouseEvent *e )
{
#ifndef QT_NO_QWS_IM
    if ( composeMode() ) {
	return;
    }
#endif

#ifndef QT_NO_DRAGANDDROP
    d->dnd_timer->stop();
    if ( d->dnd_primed &&
	 ( d->dnd_startpos - e->pos() ).manhattanLength() > QApplication::startDragDistance() ) {
	doDrag();
	return;
    }
#endif
    if ( !dragMarking )
	return;
    if ( rect().contains( e->pos() ) ) {
	stopAutoScroll();
    } else if ( !dragScrolling ) {
	startAutoScroll();
    }

    int newX, newY;
    pixelPosToCursorPos(e->pos(), &newX, &newY);

    if ( wordMark ) {
	extendSelectionWord( newX, newY);
    }

    if ( markDragX == newX && markDragY == newY )
	return;
    int oldY = markDragY;
    newMark( newX, newY, FALSE );
    for ( int i = QMIN(oldY,newY); i <= QMAX(oldY,newY); i++ )
	updateCell( i, 0, FALSE );
}

void QMultiLineEdit::extendSelectionWord( int &newX, int&newY)
{
    QString s = stringShown( newY );
    int lim = s.length();
    if ( newX >= 0 && newX < lim ) {
	int i = newX;
	int startclass = charClass(s.at(i));
	if ( markAnchorY < markDragY ||
	     ( markAnchorY == markDragY && markAnchorX < markDragX ) ) {
	    // going right
	    while ( i < lim && charClass(s.at(i)) == startclass )
		i++;
	} else {
	    // going left
	    while ( i >= 0 && charClass(s.at(i)) == startclass )
		i--;
	    i++;
	}
	newX = i;
    }
}




/*!\reimp
*/
void QMultiLineEdit::mouseReleaseEvent( QMouseEvent *e )
{
#ifndef QT_NO_QWS_IM
    if ( composeMode() ) {
#if defined (_WS_QWS_)
	QPaintDevice::qwsDisplay()->sendIMMouseEvent( pixelPosToIMPos( e->pos() ), FALSE ); 

#endif
	
	return;
    }
#endif

    stopAutoScroll();
#ifndef QT_NO_DRAGANDDROP
    if ( d->dnd_timer->isActive() ) {
	d->dnd_timer->stop();
	d->dnd_primed = FALSE;
	setCursorPixelPosition(e->pos());
    }
#endif
    wordMark = FALSE;
    dragMarking   = FALSE;
    textDirty = FALSE;
    d->isHandlingEvent = TRUE;
    if ( markAnchorY == markDragY && markAnchorX == markDragX )
	turnMark( FALSE );

#ifndef QT_NO_CLIPBOARD
#if defined(_WS_X11_)
    else if ( echoMode() == Normal )
	copy();
#endif

    if ( e->button() == MidButton && !readOnly ) {
#if defined(_WS_X11_)
	paste();		// Will repaint the cursor line.
#else
	if ( style() == MotifStyle )
	    paste();
#endif
    }
#endif

    d->isHandlingEvent = FALSE;

    if ( !readOnly && textDirty )
	emit textChanged();
}


/*!\reimp
*/
void QMultiLineEdit::mouseDoubleClickEvent( QMouseEvent *m )
{
#ifndef QT_NO_QWS_IM
    if ( composeMode() ) {
	return;
    }
#endif
    if ( m->button() == LeftButton ) {
	if ( m->state() & ShiftButton ) {
	    int newX = cursorX;
	    int newY = cursorY;
	    extendSelectionWord( newX, newY);
	    newMark( newX, newY, FALSE );
	} else {
	    markWord( cursorX, cursorY );
	}
	dragMarking    = TRUE;
	wordMark = TRUE;
	updateCell( cursorY, 0, FALSE );

    }
}

#ifndef QT_NO_DRAGANDDROP

/*!
  \reimp
*/

void QMultiLineEdit::dragEnterEvent( QDragEnterEvent * )
{
    cursorOn = TRUE;
    updateCell( cursorY, 0, FALSE );
}

/*!\reimp
*/
void QMultiLineEdit::dragMoveEvent( QDragMoveEvent* event )
{
    if ( readOnly ) return;
    event->accept( QTextDrag::canDecode(event) );
    d->dnd_forcecursor = TRUE;
    setCursorPixelPosition(event->pos(), FALSE);
    d->dnd_forcecursor = FALSE;
    QRect inside_margin(scroll_margin, scroll_margin,
			width()-scroll_margin*2, height()-scroll_margin*2);
    if ( !inside_margin.contains(event->pos()) ) {
	startAutoScroll();
    }
    if ( event->source() == this && event->action() == QDropEvent::Move )
	event->acceptAction();
}

/*!\reimp
*/
void QMultiLineEdit::dragLeaveEvent( QDragLeaveEvent* )
{
    if ( cursorOn ) {
	cursorOn = FALSE;
	updateCell( cursorY, 0, FALSE );
    }
    stopAutoScroll();
}

/*!\reimp
*/
void QMultiLineEdit::dropEvent( QDropEvent* event )
{
    if ( readOnly ) return;
    QString text;
    QCString fmt = pickSpecial(event,FALSE,event->pos());
    if ( QTextDrag::decode(event, text, fmt) ) {
	int i = -1;
	while ( ( i = text.find( '\r' ) ) != -1 )
	    text.replace( i,1,"" );
	if ( event->source() == this && event->action() == QDropEvent::Move ) {
	    event->acceptAction();
	    // Careful not to tread on my own feet
	    int newX, newY;
	    pixelPosToCursorPos( event->pos(), &newX, &newY );
	    if ( afterMark( newX, newY ) ) {
		// The tricky case
		int x1, y1, x2, y2;
		getMarkedRegion( &y1, &x1, &y2, &x2 );
		if ( newY == y2 ) {
		    newY = y1;
		    newX = x1 + newX - x2;
		} else {
		    newY -= y2 - y1;
		}
		addUndoCmd( new QBeginCommand );
		del();
		setCursorPosition(newY, newX);
		insert(text, TRUE);
		addUndoCmd( new QEndCommand );
	    } else if ( beforeMark( newX, newY ) ) {
		// Easy
		addUndoCmd( new QBeginCommand );
		del();
		setCursorPosition(newY, newX);
		insert(text, TRUE);
		addUndoCmd( new QEndCommand );
	    } else {
		// Do nothing.
	    }
	} else {
	    setCursorPixelPosition(event->pos());
	    insert(text, TRUE);
	}
	update();
	emit textChanged();
    }
}

#endif // QT_NO_DRAGANDDROP


/*!
  Returns TRUE if line \a line is invisible or partially invisible.
*/

bool QMultiLineEdit::partiallyInvisible( int line )
{
    int y;
    if ( !rowYPos( line, &y ) )
	return TRUE;
    if ( y < 0 )
	return TRUE;
    else if ( y + cellHeight() - 2 > viewHeight() )
	return TRUE;

    return FALSE;
}

/*!
  Scrolls such that the cursor is visible
*/

void QMultiLineEdit::makeVisible()
{
    if ( !autoUpdate() )
	return;

    if ( partiallyInvisible( cursorY ) ) {
	if ( cursorY >= lastRowVisible() )
	    setBottomCell( cursorY );
	else
	    setTopCell( cursorY );
    }
    int xPos = mapToView( cursorX, cursorY );
    if ( xPos < xOffset() ) {
	int of = xPos - 10; //###
	setXOffset( of );
    } else if ( xPos > xOffset() + viewWidth() ) {
	int of = xPos - viewWidth() + 10; //###
	setXOffset( of );
    }
}

/*!
  Computes the character position in line \a line which corresponds
  to pixel \a xPos
*/

int QMultiLineEdit::mapFromView( int xPos, int line )
{
    QString s = stringShown( line );
    if ( !s )
	return 0;
    QFontMetrics fm( font() );
    int index = xPosToCursorPos( s, fm,
				 xPos - d->lr_marg,
				 cellWidth() - 2 * d->lr_marg - d->marg_extra,
				 d->align );
    QMultiLineEditRow* r = contents->at( line );
    if (r && !r->newline && ((unsigned int)index == r->s.length()) && (index > 0))
	--index;
    return index;
}

/*!
  Computes the pixel position in line \a line which corresponds to
  character position \a xIndex
*/

int QMultiLineEdit::mapToView( int xIndex, int line )
{
    QString s = stringShown( line );
    xIndex = QMIN( (int)s.length(), xIndex );
    QFontMetrics fm( font() );
    int wcell = cellWidth() - 2 * d->lr_marg;// - d->marg_extra;
    int wrow = contents->at( line )->w;
    int w = textWidthWithTabs( fm, s, 0, xIndex, d->align ) - 1;
    if ( d->align == Qt::AlignCenter || d->align == Qt::AlignHCenter )
	w += (wcell - wrow) / 2;
    else if ( d->align == Qt::AlignRight )
	w += wcell - wrow;
    return d->lr_marg + w;
}

/*!
  Traverses the list and finds an item with the maximum width, and
  updates the internal list box structures accordingly.
*/

void QMultiLineEdit::updateCellWidth()
{
    QMultiLineEditRow* r = contents->first();
    int maxW = 0;
    int w;
    switch ( d->echomode ) {
    case Normal:
	while ( r ) {
	    w = r->w;
	    if ( w > maxW )
		maxW = w;
	    r = contents->next();
	}
	break;
    case Password: {
	uint l = 0;
	while ( r ) {
	    l = QMAX(l,  r->s.length() );
	    r = contents->next();
	}
	QString t;
	t.fill(QChar('*'), l);
	maxW = textWidth(t);
    }
    break;
    case NoEcho:
	maxW = textWidth(QString::fromLatin1(""));
    }
    setWidth( maxW );
}


/*!
  Sets the bottommost visible line to \a line.
*/