Source/WebCore/rendering/RenderFrameSet.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
 * 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
 * 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.
 *
 */

#pragma once

#include "RenderBox.h"

namespace WebCore {

class HTMLFrameSetElement;
class MouseEvent;
class RenderFrame;

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

struct FrameEdgeInfo {
    explicit FrameEdgeInfo(bool preventResize = false, bool allowBorder = true)
        : m_preventResize(4)
        , m_allowBorder(4)
    {
        m_preventResize.fill(preventResize);
        m_allowBorder.fill(allowBorder);
    }

    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; }

private:
    Vector<bool> m_preventResize;
    Vector<bool> m_allowBorder;
};

class RenderFrameSet final : public RenderBox {
    WTF_MAKE_ISO_ALLOCATED(RenderFrameSet);
public:
    RenderFrameSet(HTMLFrameSetElement&, RenderStyle&&);
    virtual ~RenderFrameSet();

    HTMLFrameSetElement& frameSetElement() const;

    FrameEdgeInfo edgeInfo() const;

    bool userResize(MouseEvent&);

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

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

    void notifyFrameEdgeInfoChanged();

private:
    void element() const = delete;

    static const int noSplit = -1;

    class GridAxis {
        WTF_MAKE_NONCOPYABLE(GridAxis);
    public:
        GridAxis();
        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;
    };

    ASCIILiteral renderName() const override { return "RenderFrameSet"_s; }
    bool isFrameSet() const override { return true; }

    void layout() override;
    void paint(PaintInfo&, const LayoutPoint&) override;
    bool canHaveChildren() const override { return true; }
    bool isChildAllowed(const RenderObject&, const RenderStyle&) const override;
    CursorDirective getCursor(const LayoutPoint&, Cursor&) const override;

    bool flattenFrameSet() 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&, const IntRect&);
    void paintColumnBorder(const PaintInfo&, const IntRect&);

    GridAxis m_rows;
    GridAxis m_cols;

    bool m_isResizing;
    bool m_isChildResizing;
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderFrameSet, isFrameSet())