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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsILineIterator.h"
#include "nsIFrame.h"
namespace mozilla {
void LineFrameFinder::Scan(nsIFrame* aFrame) {
if (mDone) {
return;
}
if (!mFirstFrame) {
mFirstFrame = aFrame;
}
const LogicalRect rect = aFrame->GetLogicalRect(mWM, mContainerSize);
if (rect.ISize(mWM) == 0) {
return;
}
// If pos.I() is inside this frame - this is it
if (rect.IStart(mWM) <= mPos.I(mWM) && rect.IEnd(mWM) > mPos.I(mWM)) {
mClosestFromStart = mClosestFromEnd = aFrame;
mDone = true;
return;
}
if (rect.IStart(mWM) < mPos.I(mWM)) {
if (!mClosestFromStart ||
rect.IEnd(mWM) >
mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM)) {
mClosestFromStart = aFrame;
}
} else {
if (!mClosestFromEnd ||
rect.IStart(mWM) <
mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM)) {
mClosestFromEnd = aFrame;
}
}
}
void LineFrameFinder::Finish(nsIFrame** aFrameFound,
bool* aPosIsBeforeFirstFrame,
bool* aPosIsAfterLastFrame) {
if (!mClosestFromStart && !mClosestFromEnd) {
// All frames were zero-width. Just take the first one.
mClosestFromStart = mClosestFromEnd = mFirstFrame;
}
*aPosIsBeforeFirstFrame = mIsReversed ? !mClosestFromEnd : !mClosestFromStart;
*aPosIsAfterLastFrame = mIsReversed ? !mClosestFromStart : !mClosestFromEnd;
if (mClosestFromStart == mClosestFromEnd) {
*aFrameFound = mClosestFromStart;
} else if (!mClosestFromStart) {
*aFrameFound = mClosestFromEnd;
} else if (!mClosestFromEnd) {
*aFrameFound = mClosestFromStart;
} else { // we're between two frames
nscoord delta =
mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM) -
mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM);
if (mPos.I(mWM) <
mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM) +
delta / 2) {
*aFrameFound = mClosestFromStart;
} else {
*aFrameFound = mClosestFromEnd;
}
}
}
} // namespace mozilla
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