layout.cpp

奇趣公司比较新的qt/emd版本

                    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 = m_ncols - 2; c >= 0; c--) {
        for (r = 0; r < m_nrows; r++) {
            QWidget* w = cell(r, c);
            if (!w)
                continue;
            int cc = countCol(r, c);
            int stretch = 0;
            for (i = c+1; i < m_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 < m_nrows; r++) {
        for (c = 0; c < m_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 = m_nrows - 2; r >= 0; r--) {
        for (c = 0; c < m_ncols; c++) {
            QWidget* w = cell(r, c);
            if (!w)
                continue;
            int cr = countRow(r, c);
            int stretch = 0;
            for (i = r+1; i < m_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 < m_ncols; c++)
        m_cols[c] = false;

    for (r = 0; r < m_nrows; r++)
        m_rows[r] = false;

    for (c = 0; c < m_ncols; c++) {
        for (r = 0; r < m_nrows; r++) {
            if (isWidgetTopLeft(r, c)) {
                m_rows[r] = true;
                m_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 < m_ncols; c++) {
        for (r = 0; r < m_nrows; r++) {
            if (cell(r, c) == w) {
                row = 0;
                for (r2 = 1; r2 <= r; r2++) {
                    if (m_rows[r2-1])
                        row++;
                }
                col = 0;
                for (c2 = 1; c2 <= c; c2++) {
                    if (m_cols[c2-1])
                        col++;
                }
                rowspan = 0;
                for (r2 = r ; r2 < m_nrows && cell(r2, c) == w; r2++) {
                    if (m_rows[r2])
                        rowspan++;
                }
                colspan = 0;
                for (c2 = c; c2 < m_ncols && cell(r, c2) == w; c2++) {
                    if (m_cols[c2])
                        colspan++;
                }
                return true;
            }
        }
    }
    return false;
}




GridLayout::GridLayout(const QList<QWidget*> &wl, QWidget *p, QDesignerFormWindowInterface *fw, QWidget *lb, const QSize &res) : 
    Layout(wl, p, fw, lb),
    m_resolution(res),
    m_grid(0)
{
}

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

QWidget *GridLayout::widgetAt(QGridLayout *layout, int row, int column) const
{
    int index = 0;
    while (QLayoutItem *item = layout->itemAt(index)) {
        if (item->widget()) {
            int r, c, rowspan, colspan;
            layout->getItemPosition(index, &r, &c, &rowspan, &colspan);
            if (row == r && column == c)
                return item->widget();
        }
        ++index;
    }
    return 0;
}

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

    QGridLayout *layout =  static_cast<QGridLayout *>(createLayout(LayoutInfo::Grid));
 
    if (!m_grid)
        buildGrid();

    foreach (QWidget *w, m_widgets) {
        int r = 0, c = 0, rs = 0, cs = 0;

        if (m_grid->locateWidget(w, r, c, rs, cs)) {
            if (needReparent && w->parent() != m_layoutBase) {
                w->setParent(m_layoutBase, 0);
                w->move(QPoint(0,0));
            }

            Qt::Alignment alignment = Qt::Alignment(0);
            if (Spacer *spacer = qobject_cast<Spacer*>(w))
                alignment = spacer->alignment();

            if (rs * cs == 1) {
                add_to_grid_layout(layout, w, r, c, 1, 1, alignment);
            } else {
                add_to_grid_layout(layout, w, r, c, rs, cs, alignment);
            }

            w->show();
        } else {
            qDebug("ooops, widget '%s' does not fit in layout", w->objectName().toUtf8().constData());
        }
    }

    QLayoutSupport::createEmptyCells(layout);

    finishLayout(needMove, layout);
}

void GridLayout::sort()
{
    buildGrid();
}

void GridLayout::buildGrid()
{
    if (!m_widgets.count())
        return;
#if 0
    QMap<int, int> x_dict;
    QMap<int, int> y_dict;

    foreach (QWidget *w, m_widgets) {
        QRect g = w->geometry();

        x_dict.insert(g.left(), g.left());
        x_dict.insert(g.right(), g.right());

        y_dict.insert(g.top(), g.top());
        y_dict.insert(g.bottom(), g.bottom());
    }

    QList<int> x = x_dict.keys();
    QList<int> y = y_dict.keys();
#else
    // 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
    QVector<int> x( m_widgets.count()*2 );
    QVector<int> y( m_widgets.count()*2 );

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

    qSort(x);
    qSort(y);

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

    delete m_grid;
    m_grid = new Grid(y.size() - 1, x.size() - 1);

    // Mark the cells in the grid that contains a widget
    foreach (QWidget *w, m_widgets) {
        QRect widgetPos = w->geometry();

        QRect c(0, 0, 0, 0);

        // From left til right (not including)
        for (int 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 (int ch=0; ch<y.size(); ch++) {
            if (y[ch] == widgetPos.top()   )
                c.setTop(ch);
            if (y[ch] <  widgetPos.bottom())
                c.setBottom(ch);
        }

        m_grid->setCells(c, w); // Mark cellblock
    }

    m_grid->simplify();

    QList<QWidget *> widgets;
    for (int i = 0; i < m_grid->numRows(); i++)
        for (int j = 0; j < m_grid->numCols(); j++) {
            QWidget *w = m_grid->cell(i, j);
            if (w && !widgets.contains(w))
                widgets.append(w);
        }
    m_widgets = widgets;
}


} // namespace qdesigner_internal