Source/core/rendering/RenderRegionSet.cpp - Issue 143323014: *** DO NOT LAND *** Attempt to understand Regions complexity

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Issue 143323014: *** DO NOT LAND *** Attempt to understand Regions complexity Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Created 6 years, 11 months ago

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1 /*

2 * Copyright (C) 2012 Apple Inc. All rights reserved.

3 *

4 * Redistribution and use in source and binary forms, with or without

5 * modification, are permitted provided that the following conditions

6 * are met:

7 * 1. Redistributions of source code must retain the above copyright

8 * notice, this list of conditions and the following disclaimer.

9 * 2. Redistributions in binary form must reproduce the above copyright

10 * notice, this list of conditions and the following disclaimer in the

11 * documentation and/or other materials provided with the distribution.

12 *

13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR

17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

24 */

25

26 #include "config.h"

27 #include "core/rendering/RenderRegionSet.h"

28

29 #include "core/rendering/RenderFlowThread.h"

30

31 namespace WebCore {

32

33 RenderRegionSet::RenderRegionSet(Element* element, RenderFlowThread* flowThread)

34 : RenderRegion(element, flowThread)

35 {

36 }

37

38 void RenderRegionSet::installFlowThread()

39 {

40 // We don't have to do anything, since we were able to connect the flow thre ad

41 // in the constructor.

42 }

43

44 void RenderRegionSet::expandToEncompassFlowThreadContentsIfNeeded()

45 {

46 // Whenever the last region is a set, it always expands its region rect to c onsume all

47 // of the flow thread content. This is because it is always capable of gener ating an

48 // infinite number of boxes in order to hold all of the remaining content.

49 LayoutRect rect(flowThreadPortionRect());

50

51 // Get the offset within the flow thread in its block progression direction. Then get the

52 // flow thread's remaining logical height including its overflow and expand our rect

53 // to encompass that remaining height and overflow. The idea is that we will generate

54 // additional columns and pages to hold that overflow, since people do write bad

55 // content like <body style="height:0px"> in multi-column layouts.

56 bool isHorizontal = flowThread()->isHorizontalWritingMode();

57 LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x();

58 LayoutRect layoutRect = flowThread()->layoutOverflowRect();

59 LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : l ayoutRect.maxX()) - logicalTopOffset;

60 setFlowThreadPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect. width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height()));

61 }

62

63 }

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