tor-browser

The Tor Browser
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nsILineIterator.cpp (2447B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "nsILineIterator.h"
      8 
      9 #include "nsIFrame.h"
     10 
     11 namespace mozilla {
     12 
     13 void LineFrameFinder::Scan(nsIFrame* aFrame) {
     14  if (mDone) {
     15    return;
     16  }
     17 
     18  if (!mFirstFrame) {
     19    mFirstFrame = aFrame;
     20  }
     21 
     22  const LogicalRect rect = aFrame->GetLogicalRect(mWM, mContainerSize);
     23  if (rect.ISize(mWM) == 0) {
     24    return;
     25  }
     26  // If pos.I() is inside this frame - this is it
     27  if (rect.IStart(mWM) <= mPos.I(mWM) && rect.IEnd(mWM) > mPos.I(mWM)) {
     28    mClosestFromStart = mClosestFromEnd = aFrame;
     29    mDone = true;
     30    return;
     31  }
     32  if (rect.IStart(mWM) < mPos.I(mWM)) {
     33    if (!mClosestFromStart ||
     34        rect.IEnd(mWM) >
     35            mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM)) {
     36      mClosestFromStart = aFrame;
     37    }
     38  } else {
     39    if (!mClosestFromEnd ||
     40        rect.IStart(mWM) <
     41            mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM)) {
     42      mClosestFromEnd = aFrame;
     43    }
     44  }
     45 }
     46 
     47 void LineFrameFinder::Finish(nsIFrame** aFrameFound,
     48                             bool* aPosIsBeforeFirstFrame,
     49                             bool* aPosIsAfterLastFrame) {
     50  if (!mClosestFromStart && !mClosestFromEnd) {
     51    // All frames were zero-width. Just take the first one.
     52    mClosestFromStart = mClosestFromEnd = mFirstFrame;
     53  }
     54  *aPosIsBeforeFirstFrame = mIsReversed ? !mClosestFromEnd : !mClosestFromStart;
     55  *aPosIsAfterLastFrame = mIsReversed ? !mClosestFromStart : !mClosestFromEnd;
     56  if (mClosestFromStart == mClosestFromEnd) {
     57    *aFrameFound = mClosestFromStart;
     58  } else if (!mClosestFromStart) {
     59    *aFrameFound = mClosestFromEnd;
     60  } else if (!mClosestFromEnd) {
     61    *aFrameFound = mClosestFromStart;
     62  } else {  // we're between two frames
     63    nscoord delta =
     64        mClosestFromEnd->GetLogicalRect(mWM, mContainerSize).IStart(mWM) -
     65        mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM);
     66    if (mPos.I(mWM) <
     67        mClosestFromStart->GetLogicalRect(mWM, mContainerSize).IEnd(mWM) +
     68            delta / 2) {
     69      *aFrameFound = mClosestFromStart;
     70    } else {
     71      *aFrameFound = mClosestFromEnd;
     72    }
     73  }
     74 }
     75 
     76 }  // namespace mozilla