RenderFrameSet.h   [plain text]

 * Copyright (C) 1999 Lars Knoll (
 *           (C) 2000 Simon Hausmann <>
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * 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
 * 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.

#ifndef RenderFrameSet_h
#define RenderFrameSet_h

#include "RenderContainer.h"

namespace WebCore {

class HTMLFrameSetElement;
class MouseEvent;

enum FrameEdge { LeftFrameEdge, RightFrameEdge, TopFrameEdge, BottomFrameEdge };

struct FrameEdgeInfo
    FrameEdgeInfo(bool preventResize = false, bool allowBorder = true)
        : m_preventResize(4)
        , m_allowBorder(4)

    bool preventResize(FrameEdge edge) const { return m_preventResize[edge]; }
    bool allowBorder(FrameEdge edge) const { return m_allowBorder[edge]; }

    void setPreventResize(FrameEdge edge, bool preventResize) { m_preventResize[edge] = preventResize; }
    void setAllowBorder(FrameEdge edge, bool allowBorder) { m_allowBorder[edge] = allowBorder; }

    Vector<bool> m_preventResize;
    Vector<bool> m_allowBorder;

class RenderFrameSet : public RenderContainer {
    virtual ~RenderFrameSet();

    virtual const char* renderName() const { return "RenderFrameSet"; }
    virtual bool isFrameSet() const { return true; }

    virtual void layout();
    virtual void calcPrefWidths();
    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
    virtual void paint(PaintInfo& paintInfo, int tx, int ty);
    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
    FrameEdgeInfo edgeInfo() const;

    bool userResize(MouseEvent*);

    bool isResizingRow() const;
    bool isResizingColumn() const;

    bool canResizeRow(const IntPoint&) const;
    bool canResizeColumn(const IntPoint&) const;

    bool flattenFrameset() const;

#ifndef NDEBUG
    virtual void dump(TextStream*, DeprecatedString ind = "") const;

    static const int noSplit = -1;

    class GridAxis : Noncopyable {
        void resize(int);
        Vector<int> m_sizes;
        Vector<int> m_deltas;
        Vector<bool> m_preventResize;
        Vector<bool> m_allowBorder;
        int m_splitBeingResized;
        int m_splitResizeOffset;

    inline HTMLFrameSetElement* frameSet() const;

    bool canResize(const IntPoint&) const;
    void setIsResizing(bool);

    void layOutAxis(GridAxis&, const Length*, int availableSpace);
    void computeEdgeInfo();
    void fillFromEdgeInfo(const FrameEdgeInfo& edgeInfo, int r, int c);
    void positionFrames();
    void positionFramesWithFlattening();

    int splitPosition(const GridAxis&, int split) const;
    int hitTestSplit(const GridAxis&, int position) const;

    void startResizing(GridAxis&, int position);
    void continueResizing(GridAxis&, int position);

    void paintRowBorder(const PaintInfo& paintInfo, const IntRect& rect);
    void paintColumnBorder(const PaintInfo& paintInfo, const IntRect& rect);

    GridAxis m_rows;
    GridAxis m_cols;

    bool m_isResizing;
    bool m_isChildResizing;

} // namespace WebCore

#endif // RenderFrameSet_h