layout.cpp

Linux下的基于X11的图形开发环境。

bool Grid::isWidgetStartRow( int r ) const
{
    int c;
    for ( c = 0; c < ncols; c++ ) {
	if ( cell( r, c ) && ( (r==0) || (cell( r, c) != cell( r-1, c) )) )
	    return TRUE;
    }
    return FALSE;
}

bool Grid::isWidgetEndRow( int r ) const
{
    int c;
    for ( c = 0; c < ncols; c++ ) {
	if ( cell( r, c ) && ((r == nrows-1) || (cell( r, c) != cell( r+1, c) )) )
	    return TRUE;
    }
    return FALSE;
}


bool Grid::isWidgetTopLeft( int r, int c ) const
{
    QWidget* w = cell( r, c );
    if ( !w )
	return FALSE;
    return ( !r || cell( r-1, c) != w ) && (!c || cell( r, c-1) != w);
}

void Grid::extendLeft()
{
    int r,c,i;
    for ( c = 1; c < ncols; c++ ) {
	for ( r = 0; r < nrows; r++ ) {
	    QWidget* w = cell( r, c );
	    if ( !w )
		continue;
	    int cc = countCol( r, c);
	    int stretch = 0;
	    for ( i = c-1; i >= 0; i-- ) {
		if ( cell( r, i ) )
		    break;
		if ( countCol( r, i ) < cc )
		    break;
		if ( isWidgetEndCol( i ) )
		    break;
		if ( isWidgetStartCol( i ) ) {
		    stretch = c - i;
		    break;
		}
	    }
	    if ( stretch ) {
		for ( i = 0; i < stretch; i++ )
		    setCol( r, c-i-1, w, cc );
	    }
	}
    }
}


void Grid::extendRight()
{
    int r,c,i;
    for ( c = ncols - 2; c >= 0; c-- ) {
	for ( r = 0; r < nrows; r++ ) {
	    QWidget* w = cell( r, c );
	    if ( !w )
		continue;
	    int cc = countCol( r, c);
	    int stretch = 0;
	    for ( i = c+1; i < ncols; i++ ) {
		if ( cell( r, i ) )
		    break;
		if ( countCol( r, i ) < cc )
		    break;
		if ( isWidgetStartCol( i ) )
		    break;
		if ( isWidgetEndCol( i ) ) {
		    stretch = i - c;
		    break;
		}
	    }
	    if ( stretch ) {
		for ( i = 0; i < stretch; i++ )
		    setCol( r, c+i+1, w, cc );
	    }
	}
    }

}

void Grid::extendUp()
{
    int r,c,i;
    for ( r = 1; r < nrows; r++ ) {
	for ( c = 0; c < ncols; c++ ) {
	    QWidget* w = cell( r, c );
	    if ( !w )
		continue;
	    int cr = countRow( r, c);
	    int stretch = 0;
	    for ( i = r-1; i >= 0; i-- ) {
		if ( cell( i, c ) )
		    break;
		if ( countRow( i, c ) < cr )
		    break;
		if ( isWidgetEndRow( i ) )
		    break;
		if ( isWidgetStartRow( i ) ) {
		    stretch = r - i;
		    break;
		}
	    }
	    if ( stretch ) {
		for ( i = 0; i < stretch; i++ )
		    setRow( r-i-1, c, w, cr );
	    }
	}
    }
}

void Grid::extendDown()
{
    int r,c,i;
    for ( r = nrows - 2; r >= 0; r-- ) {
	for ( c = 0; c < ncols; c++ ) {
	    QWidget* w = cell( r, c );
	    if ( !w )
		continue;
	    int cr = countRow( r, c);
	    int stretch = 0;
	    for ( i = r+1; i < nrows; i++ ) {
		if ( cell( i, c ) )
		    break;
		if ( countRow( i, c ) < cr )
		    break;
		if ( isWidgetStartRow( i ) )
		    break;
		if ( isWidgetEndRow( i ) ) {
		    stretch = i - r;
		    break;
		}
	    }
	    if ( stretch ) {
		for ( i = 0; i < stretch; i++ )
		    setRow( r+i+1, c, w, cr );
	    }
	}
    }

}

void Grid::simplify()
{
    extendLeft();
    extendRight();
    extendUp();
    extendDown();
    merge();
}


void Grid::merge()
{
    int r,c;
    for ( c = 0; c < ncols; c++ )
	cols[c] = FALSE;

    for ( r = 0; r < nrows; r++ )
	rows[r] = FALSE;

    for ( c = 0; c < ncols; c++ ) {
	for ( r = 0; r < nrows; r++ ) {
	    if ( isWidgetTopLeft( r, c ) ) {
		rows[r] = TRUE;
		cols[c] = TRUE;
	    }
	}
    }
}

bool Grid::locateWidget( QWidget* w, int& row, int& col, int& rowspan, int & colspan )
{
    int r,c, r2, c2;
    for ( c = 0; c < ncols; c++ ) {
	for ( r = 0; r < nrows; r++ ) {
	    if ( cell( r, c ) == w  ) {
		row = 0;
		for ( r2 = 1; r2 <= r; r2++ ) {
		    if ( rows[ r2-1 ] )
			row++;
		}
		col = 0;
		for ( c2 = 1; c2 <= c; c2++ ) {
		    if ( cols[ c2-1 ] )
			col++;
		}
		rowspan = 0;
		for ( r2 = r ; r2 < nrows && cell( r2, c) == w; r2++ ) {
		    if ( rows[ r2 ] )
			rowspan++;
		}
		colspan = 0;
		for ( c2 = c; c2 < ncols && cell( r, c2) == w; c2++ ) {
		    if ( cols[ c2] )
			colspan++;
		}
		return TRUE;
	    }
	}
    }
    return FALSE;
}




GridLayout::GridLayout( const QWidgetList &wl, QWidget *p, FormWindow *fw, QWidget *lb, const QSize &res, bool doSetup )
    : Layout( wl, p, fw, lb, doSetup ), resolution( res )
{
    grid = 0;
    if ( doSetup )
	setup();
}

GridLayout::~GridLayout()
{
    delete grid;
}

void GridLayout::doLayout()
{
    bool needMove, needReparent;
    if ( !prepareLayout( needMove, needReparent ) )
	return;

    QDesignerGridLayout *layout = (QDesignerGridLayout*)WidgetFactory::createLayout( layoutBase, 0, WidgetFactory::Grid );

    if ( !grid )
	buildGrid();

    QWidget* w;
    int r, c, rs, cs;
    for ( w = widgets.first(); w; w = widgets.next() ) {
	if ( grid->locateWidget( w, r, c, rs, cs) ) {
	    if ( needReparent && w->parent() != layoutBase )
		w->reparent( layoutBase, 0, QPoint( 0, 0 ), FALSE );
	    if ( rs * cs == 1 ) {
		layout->addWidget( w, r, c, w->inherits( "Spacer" ) ? ( (Spacer*)w )->alignment() : 0 );
	    } else {
		layout->addMultiCellWidget( w, r, r+rs-1, c, c+cs-1, w->inherits( "Spacer" ) ? ( (Spacer*)w )->alignment() : 0 );
	    }
	    if ( w->inherits( "QLayoutWidget" ) )
		( (QLayoutWidget*)w )->updateSizePolicy();
	    w->show();
	} else {
	    qWarning("ooops, widget '%s' does not fit in layout", w->name() );
	}
    }
    finishLayout( needMove, layout );
}

void GridLayout::setup()
{
    Layout::setup();
    buildGrid();
}

void GridLayout::buildGrid()
{
    if ( !widgets.count() )
	return;

    // Pixel to cell conversion:
    // By keeping a list of start'n'stop values (x & y) for each widget,
    // it is possible to create a very small grid of cells to represent
    // the widget layout.
    // -----------------------------------------------------------------

    // We need a list of both start and stop values for x- & y-axis
    QValueVector<int> x( widgets.count()*2 );
    QValueVector<int> y( widgets.count()*2 );

    // Using push_back would look nicer, but operator[] is much faster
    int index  = 0;
    QWidget* w = 0;
    for ( w = widgets.first(); w; w = widgets.next() ) {
	QRect widgetPos = w->geometry();
	x[index]   = widgetPos.left();
	x[index+1] = widgetPos.right();
	y[index]   = widgetPos.top();
	y[index+1] = widgetPos.bottom();
	index += 2;
    }

    qHeapSort(x);
    qHeapSort(y);

    // Remove duplicate x enteries (Remove next, if equal to current)
    if ( !x.empty() ) {
	for (QValueVector<int>::iterator current = x.begin() ;
	     (current != x.end()) && ((current+1) != x.end()) ; )
	    if ( (*current == *(current+1)) )
		x.erase(current+1);
	    else
		current++;
    }

    // Remove duplicate y enteries (Remove next, if equal to current)
    if ( !y.empty() ) {
	for (QValueVector<int>::iterator current = y.begin() ;
	     (current != y.end()) && ((current+1) != y.end()) ; )
	    if ( (*current == *(current+1)) )
		y.erase(current+1);
	    else
		current++;
    }

    // Create the smallest grid possible to represent the current layout
    // Since no widget will be placed in the last row and column, we'll
    // skip them to increase speed even further
    delete grid;
    grid = new Grid( y.size()-1, x.size()-1 );

    // Mark the cells in the grid that contains a widget
    for ( w = widgets.first(); w; w = widgets.next() ) {
	QRect c(0,0,0,0), widgetPos = w->geometry();
	// From left til right (not including)
	for (uint cw=0; cw<x.size(); cw++) {
	    if ( x[cw] == widgetPos.left() )
		c.setLeft(cw);
	    if ( x[cw] <  widgetPos.right())
		c.setRight(cw);
	}
	// From top til bottom (not including)
	for (uint ch=0; ch<y.size(); ch++) {
	    if ( y[ch] == widgetPos.top()    )
		c.setTop(ch);
	    if ( y[ch] <  widgetPos.bottom() )
		c.setBottom(ch);
	}
	grid->setCells(c, w); // Mark cellblock
    }
    grid->simplify();
}







Spacer::Spacer( QWidget *parent, const char *name )
    : QWidget( parent, name, WMouseNoMask ),
      orient( Vertical ), interactive(TRUE), sh( QSize(20,20) )
{
    setSizeType( Expanding );
    setAutoMask( TRUE );
}

void Spacer::paintEvent( QPaintEvent * )
{
    QPainter p( this );
    p.setPen( Qt::blue );

    if ( orient == Horizontal ) {
	const int dist = 3;
	const int amplitude = QMIN( 3, height() / 3 );
	const int base = height() / 2;
	int i = 0;
	p.setPen( white );
	for ( i = 0; i < width() / 3 +2; ++i )
	    p.drawLine( i * dist, base - amplitude, i * dist + dist / 2, base + amplitude );
	p.setPen( blue );
	for ( i = 0; i < width() / 3 +2; ++i )
	    p.drawLine( i * dist + dist / 2, base + amplitude, i * dist + dist, base - amplitude );
	p.drawLine( 0, 0, 0, height() );
	p.drawLine( width() - 1, 0, width() - 1, height());
    } else {
	const int dist = 3;
	const int amplitude = QMIN( 3, width() / 3 );
	const int base = width() / 2;
	int i = 0;
	p.setPen( white );
	for ( i = 0; i < height() / 3 +2; ++i )
	    p.drawLine( base - amplitude, i * dist, base + amplitude,i * dist + dist / 2 );
	p.setPen( blue );
	for ( i = 0; i < height() / 3 +2; ++i )
	    p.drawLine( base + amplitude, i * dist + dist / 2, base - amplitude, i * dist + dist );
	p.drawLine( 0, 0, width(), 0 );
	p.drawLine( 0, height() - 1, width(), height() - 1 );
    }
}

void Spacer::resizeEvent( QResizeEvent* e)
{
    QWidget::resizeEvent( e );
    if ( !parentWidget() || WidgetFactory::layoutType( parentWidget() ) == WidgetFactory::NoLayout )
	sh = size();
}

void Spacer::updateMask()
{
    QRegion r( rect() );
    if ( orient == Horizontal ) {
	const int amplitude = QMIN( 3, height() / 3 );
	const int base = height() / 2;
	r = r.subtract( QRect(1, 0, width() - 2, base - amplitude ) );
	r = r.subtract( QRect(1, base + amplitude, width() - 2, height() - base - amplitude ) );
    } else {
	const int amplitude = QMIN( 3, width() / 3 );
	const int base = width() / 2;
	r = r.subtract( QRect(0, 1, base - amplitude, height() - 2 ) );
	r = r.subtract( QRect( base + amplitude, 1, width() - base - amplitude, height() - 2 ) );
    }
    setMask( r );
}

void Spacer::setSizeType( SizeType t )
{
    QSizePolicy sizeP;
    if ( orient == Vertical )
	sizeP = QSizePolicy( QSizePolicy::Minimum, (QSizePolicy::SizeType)t );
    else
	sizeP = QSizePolicy( (QSizePolicy::SizeType)t, QSizePolicy::Minimum );
    setSizePolicy( sizeP );
}


Spacer::SizeType Spacer::sizeType() const
{
    if ( orient == Vertical )
	return (SizeType)sizePolicy().verData();
    return (SizeType)sizePolicy().horData();
}

int Spacer::alignment() const
{
    if ( orient == Vertical )
	return AlignHCenter;
    return AlignVCenter;
}

QSize Spacer::minimumSize() const
{
    QSize s = QSize( 20,20 );
    if ( sizeType() == Expanding )
	if ( orient == Vertical )
	    s.rheight() = 0;
	else
	    s.rwidth() = 0;
    return s;
}

QSize Spacer::sizeHint() const
{
    return sh;
}


void Spacer::setSizeHint( const QSize &s )
{
    sh = s;
    if ( !parentWidget() || WidgetFactory::layoutType( parentWidget() ) == WidgetFactory::NoLayout )
	resize( sizeHint() );
    updateGeometry();
}

Qt::Orientation Spacer::orientation() const
{
    return orient;
}

void Spacer::setOrientation( Qt::Orientation o )
{
    if ( orient == o )
	return;

    SizeType st = sizeType();
    orient = o;
    setSizeType( st );
    if ( interactive ) {
	sh = QSize( sh.height(), sh.width() );
	if (!parentWidget() || WidgetFactory::layoutType( parentWidget() ) == WidgetFactory::NoLayout )
	    resize( height(), width() );
    }
    updateMask();
    update();
    updateGeometry();
}


void QDesignerGridLayout::addWidget( QWidget *w, int row, int col, int align_ )
{
    items.insert( w, Item(row, col, 1, 1) );
    QGridLayout::addWidget( w, row, col, align_ );
}

void QDesignerGridLayout::addMultiCellWidget( QWidget *w, int fromRow, int toRow,
					      int fromCol, int toCol, int align_ )
{
    items.insert( w, Item(fromRow, fromCol, toRow - fromRow + 1, toCol - fromCol +1) );
    QGridLayout::addMultiCellWidget( w, fromRow, toRow, fromCol, toCol, align_ );
}