forked from mirrors/gecko-dev
b935f1c325
Depends on D158085 Differential Revision: https://phabricator.services.mozilla.com/D158437
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsILineIterator.h"
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#include "nsIFrame.h"
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namespace mozilla {
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void LineFrameFinder::Scan(nsIFrame* aFrame) {
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if (mDone) {
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return;
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}
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if (!mFirstFrame) {
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mFirstFrame = aFrame;
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}
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const LogicalRect rect = aFrame->GetLogicalRect(mWM, mContainerSize);
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if (rect.ISize(mWM) == 0) {
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return;
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}
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// If pos.I() is inside this frame - this is it
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if (rect.IStart(mWM) <= mPos.I(mWM) && rect.IEnd(mWM) > mPos.I(mWM)) {
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mClosestFromStart = mClosestFromEnd = aFrame;
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mDone = true;
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return;
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}
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if (rect.IStart(mWM) < mPos.I(mWM)) {
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if (!mClosestFromStart ||
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rect.IEnd(mWM) >
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mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM)) {
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mClosestFromStart = aFrame;
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}
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} else {
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if (!mClosestFromEnd ||
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rect.IStart(mWM) <
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mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM)) {
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mClosestFromEnd = aFrame;
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}
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}
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}
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void LineFrameFinder::Finish(nsIFrame** aFrameFound,
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bool* aPosIsBeforeFirstFrame,
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bool* aPosIsAfterLastFrame) {
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if (!mClosestFromStart && !mClosestFromEnd) {
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// All frames were zero-width. Just take the first one.
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mClosestFromStart = mClosestFromEnd = mFirstFrame;
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}
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*aPosIsBeforeFirstFrame = mIsReversed ? !mClosestFromEnd : !mClosestFromStart;
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*aPosIsAfterLastFrame = mIsReversed ? !mClosestFromStart : !mClosestFromEnd;
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if (mClosestFromStart == mClosestFromEnd) {
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*aFrameFound = mClosestFromStart;
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} else if (!mClosestFromStart) {
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*aFrameFound = mClosestFromEnd;
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} else if (!mClosestFromEnd) {
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*aFrameFound = mClosestFromStart;
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} else { // we're between two frames
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nscoord delta =
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mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM) -
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mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM);
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if (mPos.I(mWM) <
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mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM) +
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delta / 2) {
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*aFrameFound = mClosestFromStart;
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} else {
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*aFrameFound = mClosestFromEnd;
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}
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}
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}
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} // namespace mozilla
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