FCL/sf/mw/qtwebkit: comparison WebCore/rendering/RenderFrameSet.cpp

equal deleted inserted replaced

--1:000000000000
+:4f2f89ce4247
+/**
+* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+*           (C) 2000 Simon Hausmann <hausmann@kde.org>
+*           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
+* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Library General Public
+* License as published by the Free Software Foundation; either
+* version 2 of the License, or (at your option) any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Library General Public License for more details.
+*
+* You should have received a copy of the GNU Library General Public License
+* along with this library; see the file COPYING.LIB.  If not, write to
+* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+* Boston, MA 02110-1301, USA.
+*
+*/
+#include "config.h"
+#include "RenderFrameSet.h"
+#include "Document.h"
+#include "EventHandler.h"
+#include "EventNames.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLFrameSetElement.h"
+#include "HitTestRequest.h"
+#include "HitTestResult.h"
+#include "MouseEvent.h"
+#include "RenderFrame.h"
+#include "RenderView.h"
+#include "Settings.h"
+namespace WebCore {
+RenderFrameSet::RenderFrameSet(HTMLFrameSetElement* frameSet)
+: RenderBox(frameSet)
+, m_isResizing(false)
+, m_isChildResizing(false)
+{
+setInline(false);
+}
+RenderFrameSet::~RenderFrameSet()
+{
+}
+RenderFrameSet::GridAxis::GridAxis()
+: m_splitBeingResized(noSplit)
+{
+}
+inline HTMLFrameSetElement* RenderFrameSet::frameSet() const
+{
+return static_cast<HTMLFrameSetElement*>(node());
+}
+static Color borderStartEdgeColor()
+{
+return Color(170, 170, 170);
+}
+static Color borderEndEdgeColor()
+{
+return Color::black;
+}
+static Color borderFillColor()
+{
+return Color(208, 208, 208);
+}
+void RenderFrameSet::paintColumnBorder(const PaintInfo& paintInfo, const IntRect& borderRect)
+{
+if (!paintInfo.rect.intersects(borderRect))
+return;
+// FIXME: We should do something clever when borders from distinct framesets meet at a join.
+// Fill first.
+GraphicsContext* context = paintInfo.context;
+ColorSpace colorSpace = style()->colorSpace();
+context->fillRect(borderRect, frameSet()->hasBorderColor() ? style()->visitedDependentColor(CSSPropertyBorderLeftColor) : borderFillColor(), colorSpace);
+// Now stroke the edges but only if we have enough room to paint both edges with a little
+// bit of the fill color showing through.
+if (borderRect.width() >= 3) {
+context->fillRect(IntRect(borderRect.topLeft(), IntSize(1, height())), borderStartEdgeColor(), colorSpace);
+context->fillRect(IntRect(borderRect.topRight(), IntSize(1, height())), borderEndEdgeColor(), colorSpace);
+}
+}
+void RenderFrameSet::paintRowBorder(const PaintInfo& paintInfo, const IntRect& borderRect)
+{
+if (!paintInfo.rect.intersects(borderRect))
+return;
+// FIXME: We should do something clever when borders from distinct framesets meet at a join.
+// Fill first.
+GraphicsContext* context = paintInfo.context;
+ColorSpace colorSpace = style()->colorSpace();
+context->fillRect(borderRect, frameSet()->hasBorderColor() ? style()->visitedDependentColor(CSSPropertyBorderLeftColor) : borderFillColor(), colorSpace);
+// Now stroke the edges but only if we have enough room to paint both edges with a little
+// bit of the fill color showing through.
+if (borderRect.height() >= 3) {
+context->fillRect(IntRect(borderRect.topLeft(), IntSize(width(), 1)), borderStartEdgeColor(), colorSpace);
+context->fillRect(IntRect(borderRect.bottomLeft(), IntSize(width(), 1)), borderEndEdgeColor(), colorSpace);
+}
+}
+void RenderFrameSet::paint(PaintInfo& paintInfo, int tx, int ty)
+{
+if (paintInfo.phase != PaintPhaseForeground)
+return;
+RenderObject* child = firstChild();
+if (!child)
+return;
+// Add in our offsets.
+tx += x();
+ty += y();
+int rows = frameSet()->totalRows();
+int cols = frameSet()->totalCols();
+int borderThickness = frameSet()->border();
+int yPos = 0;
+for (int r = 0; r < rows; r++) {
+int xPos = 0;
+for (int c = 0; c < cols; c++) {
+child->paint(paintInfo, tx, ty);
+xPos += m_cols.m_sizes[c];
+if (borderThickness && m_cols.m_allowBorder[c + 1]) {
+paintColumnBorder(paintInfo, IntRect(tx + xPos, ty + yPos, borderThickness, height()));
+xPos += borderThickness;
+}
+child = child->nextSibling();
+if (!child)
+return;
+}
+yPos += m_rows.m_sizes[r];
+if (borderThickness && m_rows.m_allowBorder[r + 1]) {
+paintRowBorder(paintInfo, IntRect(tx, ty + yPos, width(), borderThickness));
+yPos += borderThickness;
+}
+}
+}
+bool RenderFrameSet::nodeAtPoint(const HitTestRequest& request, HitTestResult& result,
+int x, int y, int tx, int ty, HitTestAction action)
+{
+if (action != HitTestForeground)
+return false;
+bool inside = RenderBox::nodeAtPoint(request, result, x, y, tx, ty, action)
+|| m_isResizing;
+if (inside && frameSet()->noResize()
+&& !request.readOnly() && !result.innerNode()) {
+result.setInnerNode(node());
+result.setInnerNonSharedNode(node());
+}
+return inside || m_isChildResizing;
+}
+void RenderFrameSet::GridAxis::resize(int size)
+{
+m_sizes.resize(size);
+m_deltas.resize(size);
+m_deltas.fill(0);
+// To track edges for resizability and borders, we need to be (size + 1).  This is because a parent frameset
+// may ask us for information about our left/top/right/bottom edges in order to make its own decisions about
+// what to do.  We are capable of tainting that parent frameset's borders, so we have to cache this info.
+m_preventResize.resize(size + 1);
+m_allowBorder.resize(size + 1);
+}
+void RenderFrameSet::layOutAxis(GridAxis& axis, const Length* grid, int availableLen)
+{
+availableLen = max(availableLen, 0);
+int* gridLayout = axis.m_sizes.data();
+if (!grid) {
+gridLayout[0] = availableLen;
+return;
+}
+int gridLen = axis.m_sizes.size();
+ASSERT(gridLen);
+int totalRelative = 0;
+int totalFixed = 0;
+int totalPercent = 0;
+int countRelative = 0;
+int countFixed = 0;
+int countPercent = 0;
+// First we need to investigate how many columns of each type we have and
+// how much space these columns are going to require.
+for (int i = 0; i < gridLen; ++i) {
+// Count the total length of all of the fixed columns/rows -> totalFixed
+// Count the number of columns/rows which are fixed -> countFixed
+if (grid[i].isFixed()) {
+gridLayout[i] = max(grid[i].value(), 0);
+totalFixed += gridLayout[i];
+countFixed++;
+}
+// Count the total percentage of all of the percentage columns/rows -> totalPercent
+// Count the number of columns/rows which are percentages -> countPercent
+if (grid[i].isPercent()) {
+gridLayout[i] = max(grid[i].calcValue(availableLen), 0);
+totalPercent += gridLayout[i];
+countPercent++;
+}
+// Count the total relative of all the relative columns/rows -> totalRelative
+// Count the number of columns/rows which are relative -> countRelative
+if (grid[i].isRelative()) {
+totalRelative += max(grid[i].value(), 1);
+countRelative++;
+}
+}
+int remainingLen = availableLen;
+// Fixed columns/rows are our first priority. If there is not enough space to fit all fixed
+// columns/rows we need to proportionally adjust their size.
+if (totalFixed > remainingLen) {
+int remainingFixed = remainingLen;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isFixed()) {
+gridLayout[i] = (gridLayout[i] * remainingFixed) / totalFixed;
+remainingLen -= gridLayout[i];
+}
+}
+} else
+remainingLen -= totalFixed;
+// Percentage columns/rows are our second priority. Divide the remaining space proportionally
+// over all percentage columns/rows. IMPORTANT: the size of each column/row is not relative
+// to 100%, but to the total percentage. For example, if there are three columns, each of 75%,
+// and the available space is 300px, each column will become 100px in width.
+if (totalPercent > remainingLen) {
+int remainingPercent = remainingLen;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isPercent()) {
+gridLayout[i] = (gridLayout[i] * remainingPercent) / totalPercent;
+remainingLen -= gridLayout[i];
+}
+}
+} else
+remainingLen -= totalPercent;
+// Relative columns/rows are our last priority. Divide the remaining space proportionally
+// over all relative columns/rows. IMPORTANT: the relative value of 0* is treated as 1*.
+if (countRelative) {
+int lastRelative = 0;
+int remainingRelative = remainingLen;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isRelative()) {
+gridLayout[i] = (max(grid[i].value(), 1) * remainingRelative) / totalRelative;
+remainingLen -= gridLayout[i];
+lastRelative = i;
+}
+}
+// If we could not evenly distribute the available space of all of the relative
+// columns/rows, the remainder will be added to the last column/row.
+// For example: if we have a space of 100px and three columns (*,*,*), the remainder will
+// be 1px and will be added to the last column: 33px, 33px, 34px.
+if (remainingLen) {
+gridLayout[lastRelative] += remainingLen;
+remainingLen = 0;
+}
+}
+// If we still have some left over space we need to divide it over the already existing
+// columns/rows
+if (remainingLen) {
+// Our first priority is to spread if over the percentage columns. The remaining
+// space is spread evenly, for example: if we have a space of 100px, the columns
+// definition of 25%,25% used to result in two columns of 25px. After this the
+// columns will each be 50px in width.
+if (countPercent && totalPercent) {
+int remainingPercent = remainingLen;
+int changePercent = 0;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isPercent()) {
+changePercent = (remainingPercent * gridLayout[i]) / totalPercent;
+gridLayout[i] += changePercent;
+remainingLen -= changePercent;
+}
+}
+} else if (totalFixed) {
+// Our last priority is to spread the remaining space over the fixed columns.
+// For example if we have 100px of space and two column of each 40px, both
+// columns will become exactly 50px.
+int remainingFixed = remainingLen;
+int changeFixed = 0;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isFixed()) {
+changeFixed = (remainingFixed * gridLayout[i]) / totalFixed;
+gridLayout[i] += changeFixed;
+remainingLen -= changeFixed;
+}
+}
+}
+}
+// If we still have some left over space we probably ended up with a remainder of
+// a division. We cannot spread it evenly anymore. If we have any percentage
+// columns/rows simply spread the remainder equally over all available percentage columns,
+// regardless of their size.
+if (remainingLen && countPercent) {
+int remainingPercent = remainingLen;
+int changePercent = 0;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isPercent()) {
+changePercent = remainingPercent / countPercent;
+gridLayout[i] += changePercent;
+remainingLen -= changePercent;
+}
+}
+}
+// If we don't have any percentage columns/rows we only have fixed columns. Spread
+// the remainder equally over all fixed columns/rows.
+else if (remainingLen && countFixed) {
+int remainingFixed = remainingLen;
+int changeFixed = 0;
+for (int i = 0; i < gridLen; ++i) {
+if (grid[i].isFixed()) {
+changeFixed = remainingFixed / countFixed;
+gridLayout[i] += changeFixed;
+remainingLen -= changeFixed;
+}
+}
+}
+// Still some left over. Add it to the last column, because it is impossible
+// spread it evenly or equally.
+if (remainingLen)
+gridLayout[gridLen - 1] += remainingLen;
+// now we have the final layout, distribute the delta over it
+bool worked = true;
+int* gridDelta = axis.m_deltas.data();
+for (int i = 0; i < gridLen; ++i) {
+if (gridLayout[i] && gridLayout[i] + gridDelta[i] <= 0)
+worked = false;
+gridLayout[i] += gridDelta[i];
+}
+// if the deltas broke something, undo them
+if (!worked) {
+for (int i = 0; i < gridLen; ++i)
+gridLayout[i] -= gridDelta[i];
+axis.m_deltas.fill(0);
+}
+}
+void RenderFrameSet::fillFromEdgeInfo(const FrameEdgeInfo& edgeInfo, int r, int c)
+{
+if (edgeInfo.allowBorder(LeftFrameEdge))
+m_cols.m_allowBorder[c] = true;
+if (edgeInfo.allowBorder(RightFrameEdge))
+m_cols.m_allowBorder[c + 1] = true;
+if (edgeInfo.preventResize(LeftFrameEdge))
+m_cols.m_preventResize[c] = true;
+if (edgeInfo.preventResize(RightFrameEdge))
+m_cols.m_preventResize[c + 1] = true;
+if (edgeInfo.allowBorder(TopFrameEdge))
+m_rows.m_allowBorder[r] = true;
+if (edgeInfo.allowBorder(BottomFrameEdge))
+m_rows.m_allowBorder[r + 1] = true;
+if (edgeInfo.preventResize(TopFrameEdge))
+m_rows.m_preventResize[r] = true;
+if (edgeInfo.preventResize(BottomFrameEdge))
+m_rows.m_preventResize[r + 1] = true;
+}
+void RenderFrameSet::computeEdgeInfo()
+{
+m_rows.m_preventResize.fill(frameSet()->noResize());
+m_rows.m_allowBorder.fill(false);
+m_cols.m_preventResize.fill(frameSet()->noResize());
+m_cols.m_allowBorder.fill(false);
+RenderObject* child = firstChild();
+if (!child)
+return;
+int rows = frameSet()->totalRows();
+int cols = frameSet()->totalCols();
+for (int r = 0; r < rows; ++r) {
+for (int c = 0; c < cols; ++c) {
+FrameEdgeInfo edgeInfo;
+if (child->isFrameSet())
+edgeInfo = toRenderFrameSet(child)->edgeInfo();
+else
+edgeInfo = toRenderFrame(child)->edgeInfo();
+fillFromEdgeInfo(edgeInfo, r, c);
+child = child->nextSibling();
+if (!child)
+return;
+}
+}
+}
+FrameEdgeInfo RenderFrameSet::edgeInfo() const
+{
+FrameEdgeInfo result(frameSet()->noResize(), true);
+int rows = frameSet()->totalRows();
+int cols = frameSet()->totalCols();
+if (rows && cols) {
+result.setPreventResize(LeftFrameEdge, m_cols.m_preventResize[0]);
+result.setAllowBorder(LeftFrameEdge, m_cols.m_allowBorder[0]);
+result.setPreventResize(RightFrameEdge, m_cols.m_preventResize[cols]);
+result.setAllowBorder(RightFrameEdge, m_cols.m_allowBorder[cols]);
+result.setPreventResize(TopFrameEdge, m_rows.m_preventResize[0]);
+result.setAllowBorder(TopFrameEdge, m_rows.m_allowBorder[0]);
+result.setPreventResize(BottomFrameEdge, m_rows.m_preventResize[rows]);
+result.setAllowBorder(BottomFrameEdge, m_rows.m_allowBorder[rows]);
+}
+return result;
+}
+void RenderFrameSet::layout()
+{
+ASSERT(needsLayout());
+bool doFullRepaint = selfNeedsLayout() && checkForRepaintDuringLayout();
+IntRect oldBounds;
+if (doFullRepaint)
+oldBounds = absoluteClippedOverflowRect();
+if (!parent()->isFrameSet() && !document()->printing()) {
+setWidth(view()->viewWidth());
+setHeight(view()->viewHeight());
+}
+size_t cols = frameSet()->totalCols();
+size_t rows = frameSet()->totalRows();
+if (m_rows.m_sizes.size() != rows || m_cols.m_sizes.size() != cols) {
+m_rows.resize(rows);
+m_cols.resize(cols);
+}
+int borderThickness = frameSet()->border();
+layOutAxis(m_rows, frameSet()->rowLengths(), height() - (rows - 1) * borderThickness);
+layOutAxis(m_cols, frameSet()->colLengths(), width() - (cols - 1) * borderThickness);
+if (flattenFrameSet())
+positionFramesWithFlattening();
+else
+positionFrames();
+RenderBox::layout();
+computeEdgeInfo();
+if (doFullRepaint) {
+view()->repaintViewRectangle(oldBounds);
+IntRect newBounds = absoluteClippedOverflowRect();
+if (newBounds != oldBounds)
+view()->repaintViewRectangle(newBounds);
+}
+setNeedsLayout(false);
+}
+void RenderFrameSet::positionFrames()
+{
+RenderBox* child = firstChildBox();
+if (!child)
+return;
+int rows = frameSet()->totalRows();
+int cols = frameSet()->totalCols();
+int yPos = 0;
+int borderThickness = frameSet()->border();
+for (int r = 0; r < rows; r++) {
+int xPos = 0;
+int height = m_rows.m_sizes[r];
+for (int c = 0; c < cols; c++) {
+child->setLocation(xPos, yPos);
+int width = m_cols.m_sizes[c];
+// has to be resized and itself resize its contents
+if (width != child->width() || height != child->height()) {
+child->setWidth(width);
+child->setHeight(height);
+child->setNeedsLayout(true);
+child->layout();
+}
+xPos += width + borderThickness;
+child = child->nextSiblingBox();
+if (!child)
+return;
+}
+yPos += height + borderThickness;
+}
+// all the remaining frames are hidden to avoid ugly spurious unflowed frames
+for (; child; child = child->nextSiblingBox()) {
+child->setWidth(0);
+child->setHeight(0);
+child->setNeedsLayout(false);
+}
+}
+void RenderFrameSet::positionFramesWithFlattening()
+{
+RenderBox* child = firstChildBox();
+if (!child)
+return;
+int rows = frameSet()->totalRows();
+int cols = frameSet()->totalCols();
+int borderThickness = frameSet()->border();
+bool repaintNeeded = false;
+// calculate frameset height based on actual content height to eliminate scrolling
+bool out = false;
+for (int r = 0; r < rows && !out; r++) {
+int extra = 0;
+int height = m_rows.m_sizes[r];
+for (int c = 0; c < cols; c++) {
+IntRect oldFrameRect = child->frameRect();
+int width = m_cols.m_sizes[c];
+bool fixedWidth = frameSet()->colLengths() && frameSet()->colLengths()[c].isFixed();
+bool fixedHeight = frameSet()->rowLengths() && frameSet()->rowLengths()[r].isFixed();
+// has to be resized and itself resize its contents
+if (!fixedWidth)
+child->setWidth(width ? width + extra / (cols - c) : 0);
+else
+child->setWidth(width);
+child->setHeight(height);
+child->setNeedsLayout(true);
+if (child->isFrameSet())
+toRenderFrameSet(child)->layout();
+else
+toRenderFrame(child)->layoutWithFlattening(fixedWidth, fixedHeight);
+if (child->height() > m_rows.m_sizes[r])
+m_rows.m_sizes[r] = child->height();
+if (child->width() > m_cols.m_sizes[c])
+m_cols.m_sizes[c] = child->width();
+if (child->frameRect() != oldFrameRect)
+repaintNeeded = true;
+// difference between calculated frame width and the width it actually decides to have
+extra += width - m_cols.m_sizes[c];
+child = child->nextSiblingBox();
+if (!child) {
+out = true;
+break;
+}
+}
+}
+int xPos = 0;
+int yPos = 0;
+out = false;
+child = firstChildBox();
+for (int r = 0; r < rows && !out; r++) {
+xPos = 0;
+for (int c = 0; c < cols; c++) {
+// ensure the rows and columns are filled
+IntRect oldRect = child->frameRect();
+child->setLocation(xPos, yPos);
+child->setHeight(m_rows.m_sizes[r]);
+child->setWidth(m_cols.m_sizes[c]);
+if (child->frameRect() != oldRect) {
+repaintNeeded = true;
+// update to final size
+child->setNeedsLayout(true);
+if (child->isFrameSet())
+toRenderFrameSet(child)->layout();
+else
+toRenderFrame(child)->layoutWithFlattening(true, true);
+}
+xPos += m_cols.m_sizes[c] + borderThickness;
+child = child->nextSiblingBox();
+if (!child) {
+out = true;
+break;
+}
+}
+yPos += m_rows.m_sizes[r] + borderThickness;
+}
+setWidth(xPos - borderThickness);
+setHeight(yPos - borderThickness);
+if (repaintNeeded)
+repaint();
+// all the remaining frames are hidden to avoid ugly spurious unflowed frames
+for (; child; child = child->nextSiblingBox()) {
+child->setWidth(0);
+child->setHeight(0);
+child->setNeedsLayout(false);
+}
+}
+bool RenderFrameSet::flattenFrameSet() const
+{
+return frame() && frame()->settings()->frameFlatteningEnabled();
+}
+void RenderFrameSet::startResizing(GridAxis& axis, int position)
+{
+int split = hitTestSplit(axis, position);
+if (split == noSplit || !axis.m_allowBorder[split] || axis.m_preventResize[split]) {
+axis.m_splitBeingResized = noSplit;
+return;
+}
+axis.m_splitBeingResized = split;
+axis.m_splitResizeOffset = position - splitPosition(axis, split);
+}
+void RenderFrameSet::continueResizing(GridAxis& axis, int position)
+{
+if (needsLayout())
+return;
+if (axis.m_splitBeingResized == noSplit)
+return;
+int currentSplitPosition = splitPosition(axis, axis.m_splitBeingResized);
+int delta = (position - currentSplitPosition) - axis.m_splitResizeOffset;
+if (delta == 0)
+return;
+axis.m_deltas[axis.m_splitBeingResized - 1] += delta;
+axis.m_deltas[axis.m_splitBeingResized] -= delta;
+setNeedsLayout(true);
+}
+bool RenderFrameSet::userResize(MouseEvent* evt)
+{
+if (flattenFrameSet())
+return false;
+if (!m_isResizing) {
+if (needsLayout())
+return false;
+if (evt->type() == eventNames().mousedownEvent && evt->button() == LeftButton) {
+FloatPoint pos = localToAbsolute();
+startResizing(m_cols, evt->absoluteLocation().x() - pos.x());
+startResizing(m_rows, evt->absoluteLocation().y() - pos.y());
+if (m_cols.m_splitBeingResized != noSplit || m_rows.m_splitBeingResized != noSplit) {
+setIsResizing(true);
+return true;
+}
+}
+} else {
+if (evt->type() == eventNames().mousemoveEvent || (evt->type() == eventNames().mouseupEvent && evt->button() == LeftButton)) {
+FloatPoint pos = localToAbsolute();
+continueResizing(m_cols, evt->absoluteLocation().x() - pos.x());
+continueResizing(m_rows, evt->absoluteLocation().y() - pos.y());
+if (evt->type() == eventNames().mouseupEvent && evt->button() == LeftButton) {
+setIsResizing(false);
+return true;
+}
+}
+}
+return false;
+}
+void RenderFrameSet::setIsResizing(bool isResizing)
+{
+m_isResizing = isResizing;
+for (RenderObject* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
+if (ancestor->isFrameSet())
+toRenderFrameSet(ancestor)->m_isChildResizing = isResizing;
+}
+if (Frame* frame = this->frame())
+frame->eventHandler()->setResizingFrameSet(isResizing ? frameSet() : 0);
+}
+bool RenderFrameSet::isResizingRow() const
+{
+return m_isResizing && m_rows.m_splitBeingResized != noSplit;
+}
+bool RenderFrameSet::isResizingColumn() const
+{
+return m_isResizing && m_cols.m_splitBeingResized != noSplit;
+}
+bool RenderFrameSet::canResizeRow(const IntPoint& p) const
+{
+int r = hitTestSplit(m_rows, p.y());
+return r != noSplit && m_rows.m_allowBorder[r] && !m_rows.m_preventResize[r];
+}
+bool RenderFrameSet::canResizeColumn(const IntPoint& p) const
+{
+int c = hitTestSplit(m_cols, p.x());
+return c != noSplit && m_cols.m_allowBorder[c] && !m_cols.m_preventResize[c];
+}
+int RenderFrameSet::splitPosition(const GridAxis& axis, int split) const
+{
+if (needsLayout())
+return 0;
+int borderThickness = frameSet()->border();
+int size = axis.m_sizes.size();
+if (!size)
+return 0;
+int position = 0;
+for (int i = 0; i < split && i < size; ++i)
+position += axis.m_sizes[i] + borderThickness;
+return position - borderThickness;
+}
+int RenderFrameSet::hitTestSplit(const GridAxis& axis, int position) const
+{
+if (needsLayout())
+return noSplit;
+int borderThickness = frameSet()->border();
+if (borderThickness <= 0)
+return noSplit;
+size_t size = axis.m_sizes.size();
+if (!size)
+return noSplit;
+int splitPosition = axis.m_sizes[0];
+for (size_t i = 1; i < size; ++i) {
+if (position >= splitPosition && position < splitPosition + borderThickness)
+return i;
+splitPosition += borderThickness + axis.m_sizes[i];
+}
+return noSplit;
+}
+bool RenderFrameSet::isChildAllowed(RenderObject* child, RenderStyle*) const
+{
+return child->isFrame() || child->isFrameSet();
+}
+} // namespace WebCore