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/*
* Copyright (C) 2004, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef VisiblePosition_h
#define VisiblePosition_h
#include "Node.h"
#include "Position.h"
#include "TextDirection.h"
namespace WebCore {
// VisiblePosition default affinity is downstream because
// the callers do not really care (they just want the
// deep position without regard to line position), and this
// is cheaper than UPSTREAM
#define VP_DEFAULT_AFFINITY DOWNSTREAM
// Callers who do not know where on the line the position is,
// but would like UPSTREAM if at a line break or DOWNSTREAM
// otherwise, need a clear way to specify that. The
// constructors auto-correct UPSTREAM to DOWNSTREAM if the
// position is not at a line break.
#define VP_UPSTREAM_IF_POSSIBLE UPSTREAM
class InlineBox;
class VisiblePosition {
public:
// NOTE: UPSTREAM affinity will be used only if pos is at end of a wrapped line,
// otherwise it will be converted to DOWNSTREAM
VisiblePosition() : m_affinity(VP_DEFAULT_AFFINITY) { }
VisiblePosition(Node*, int offset, EAffinity);
VisiblePosition(const Position&, EAffinity = VP_DEFAULT_AFFINITY);
void clear() { m_deepPosition.clear(); }
bool isNull() const { return m_deepPosition.isNull(); }
bool isNotNull() const { return m_deepPosition.isNotNull(); }
Position deepEquivalent() const { return m_deepPosition; }
EAffinity affinity() const { ASSERT(m_affinity == UPSTREAM || m_affinity == DOWNSTREAM); return m_affinity; }
void setAffinity(EAffinity affinity) { m_affinity = affinity; }
// next() and previous() will increment/decrement by a character cluster.
VisiblePosition next(bool stayInEditableContent = false) const;
VisiblePosition previous(bool stayInEditableContent = false) const;
VisiblePosition honorEditableBoundaryAtOrBefore(const VisiblePosition&) const;
VisiblePosition honorEditableBoundaryAtOrAfter(const VisiblePosition&) const;
VisiblePosition left(bool stayInEditableContent = false) const;
VisiblePosition right(bool stayInEditableContent = false) const;
UChar characterAfter() const;
UChar characterBefore() const { return previous().characterAfter(); }
void debugPosition(const char* msg = "") const;
Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.node()->rootEditableElement() : 0; }
void getInlineBoxAndOffset(InlineBox*& inlineBox, int& caretOffset) const
{
m_deepPosition.getInlineBoxAndOffset(m_affinity, inlineBox, caretOffset);
}
void getInlineBoxAndOffset(TextDirection primaryDirection, InlineBox*& inlineBox, int& caretOffset) const
{
m_deepPosition.getInlineBoxAndOffset(m_affinity, primaryDirection, inlineBox, caretOffset);
}
IntRect caretRect() const;
#ifndef NDEBUG
void formatForDebugger(char* buffer, unsigned length) const;
void showTreeForThis() const;
#endif
private:
void init(const Position&, EAffinity);
Position canonicalPosition(const Position&);
Position leftVisuallyDistinctCandidate() const;
Position rightVisuallyDistinctCandidate() const;
Position m_deepPosition;
EAffinity m_affinity;
};
// FIXME: This shouldn't ignore affinity.
inline bool operator==(const VisiblePosition& a, const VisiblePosition& b)
{
return a.deepEquivalent() == b.deepEquivalent();
}
inline bool operator!=(const VisiblePosition& a, const VisiblePosition& b)
{
return !(a == b);
}
PassRefPtr<Range> makeRange(const VisiblePosition&, const VisiblePosition&);
bool setStart(Range*, const VisiblePosition&);
bool setEnd(Range*, const VisiblePosition&);
VisiblePosition startVisiblePosition(const Range*, EAffinity);
VisiblePosition endVisiblePosition(const Range*, EAffinity);
Node *enclosingBlockFlowElement(const VisiblePosition&);
bool isFirstVisiblePositionInNode(const VisiblePosition&, const Node*);
bool isLastVisiblePositionInNode(const VisiblePosition&, const Node*);
} // namespace WebCore
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showTree(const WebCore::VisiblePosition*);
void showTree(const WebCore::VisiblePosition&);
#endif
#endif // VisiblePosition_h
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