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/*
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef CachedHistory_H
#define CachedHistory_H
#include "CachedFrame.h"
#define NAVIGATION_VISIT_DEPTH 8 // the number of nodes last visited -- used to detect ping-ponging (number should be tuned)
namespace android {
class CachedRoot;
// CachedHistory is maintained even if DOM is rebuilt by running script.
// It uses blind pointers for comparison in the previously visited nodes.
class CachedHistory {
public:
CachedHistory();
void addToVisited(const CachedNode* , CachedFrame::Direction );
bool checkVisited(const CachedNode* , CachedFrame::Direction ) const;
bool didFirstLayout() const { return mDidFirstLayout; }
bool directionChange() const { return mDirectionChange; }
const WebCore::IntRect& focusBounds() const { return mFocusBounds; }
int minWorkingHorizontal() const { return mMinWorkingHorizontal; }
int minWorkingVertical() const { return mMinWorkingVertical; }
int maxWorkingHorizontal() const { return mMaxWorkingHorizontal; }
int maxWorkingVertical() const { return mMaxWorkingVertical; }
const WebCore::IntRect& navBounds() const { return mNavBounds; }
const WebCore::IntRect& priorBounds() const { return mPriorBounds; }
void setDidFirstLayout(bool did) { mDidFirstLayout = did; }
void setNavBounds(const WebCore::IntRect& loc) { mNavBounds = loc; }
void setWorking(CachedFrame::Direction , const CachedNode* focus,
const WebCore::IntRect& viewBounds);
void reset();
private:
void pinMaxMin(const WebCore::IntRect& viewBounds);
struct Visited {
const CachedNode* mNode;
CachedFrame::Direction mDirection;
} mVisited[NAVIGATION_VISIT_DEPTH];
WebCore::IntRect mFocusBounds; // chosen focus ring
WebCore::IntRect mMouseBounds; // constricted bounds, if focus ring is partially visible
WebCore::IntRect mNavBounds; // focus ring bounds plus optional keystroke movement
WebCore::IntRect mPriorBounds; // prior chosen focus ring (for reversing narrowing)
bool mDirectionChange;
bool mFocusIsInput; // defer max/min to non-focus node if focus is too broad
bool mPriorIsInput; // defer max/min to non-focus node if focus is too broad
bool mDidFirstLayout; // set true when page is newly laid out
CachedFrame::Direction mLastMove;
CachedFrame::Direction mPriorMove;
int mMinWorkingHorizontal;
int mMaxWorkingHorizontal;
int mMinWorkingVertical;
int mMaxWorkingVertical;
friend class CachedRoot;
#if DUMP_NAV_CACHE
public:
class Debug {
public:
CachedHistory* base() const;
const char* direction(CachedFrame::Direction d) const;
void print(CachedRoot* ) const;
} mDebug;
#endif
};
}
#endif
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