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Unified Diff: Source/core/rendering/RenderMultiColumnSet.h

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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Index: Source/core/rendering/RenderMultiColumnSet.h
diff --git a/Source/core/rendering/RenderMultiColumnSet.h b/Source/core/rendering/RenderMultiColumnSet.h
deleted file mode 100644
index 057f4bf260b6f1691628c3c51f0fffc748845d51..0000000000000000000000000000000000000000
--- a/Source/core/rendering/RenderMultiColumnSet.h
+++ /dev/null
@@ -1,160 +0,0 @@
-/*
- * Copyright (C) 2012 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-#ifndef RenderMultiColumnSet_h
-#define RenderMultiColumnSet_h
-
-#include "core/rendering/RenderRegionSet.h"
-
-namespace WebCore {
-
-// RenderMultiColumnSet represents a set of columns that all have the same width and height. By combining runs of same-size columns into a single
-// object, we significantly reduce the number of unique RenderObjects required to represent columns.
-//
-// A simple multi-column block will have exactly one RenderMultiColumnSet child. A simple paginated multi-column block will have three
-// RenderMultiColumnSet children: one for the content at the bottom of the first page (whose columns will have a shorter height), one
-// for the 2nd to n-1 pages, and then one last column set that will hold the shorter columns on the final page (that may have to be balanced
-// as well).
-//
-// Column spans result in the creation of new column sets as well, since a spanning region has to be placed in between the column sets that
-// come before and after the span.
-class RenderMultiColumnSet FINAL : public RenderRegionSet {
-public:
- static RenderMultiColumnSet* createAnonymous(RenderFlowThread*);
-
- virtual bool isRenderMultiColumnSet() const OVERRIDE { return true; }
-
- unsigned computedColumnCount() const { return m_computedColumnCount; }
- LayoutUnit computedColumnWidth() const { return m_computedColumnWidth; }
- LayoutUnit computedColumnHeight() const { return m_computedColumnHeight; }
-
- void setComputedColumnWidthAndCount(LayoutUnit width, unsigned count)
- {
- m_computedColumnWidth = width;
- m_computedColumnCount = count;
- }
-
- LayoutUnit heightAdjustedForSetOffset(LayoutUnit height) const;
-
- void updateMinimumColumnHeight(LayoutUnit height) { m_minimumColumnHeight = std::max(height, m_minimumColumnHeight); }
- LayoutUnit minimumColumnHeight() const { return m_minimumColumnHeight; }
-
- unsigned forcedBreaksCount() const { return m_forcedBreaksCount; }
- LayoutUnit forcedBreakOffset() const { return m_forcedBreakOffset; }
- LayoutUnit maximumDistanceBetweenForcedBreaks() const { return m_maximumDistanceBetweenForcedBreaks; }
- void clearForcedBreaks()
- {
- m_forcedBreaksCount = 0;
- m_maximumDistanceBetweenForcedBreaks = 0;
- m_forcedBreakOffset = 0;
- }
- void addForcedBreak(LayoutUnit offsetFromFirstPage)
- {
- ASSERT(!computedColumnHeight());
- LayoutUnit distanceFromLastBreak = offsetFromFirstPage - m_forcedBreakOffset;
- if (!distanceFromLastBreak)
- return;
- m_forcedBreaksCount++;
- m_maximumDistanceBetweenForcedBreaks = std::max(m_maximumDistanceBetweenForcedBreaks, distanceFromLastBreak);
- m_forcedBreakOffset = offsetFromFirstPage;
- }
-
- // Calculate the column height when contents are supposed to be balanced. If 'initial' is set,
- // guess an initial column height; otherwise, stretch the column height a tad. Return true if
- // column height changed and another layout pass is required.
- bool calculateBalancedHeight(bool initial);
-
- // Record space shortage (the amount of space that would have been enough to prevent some
- // element from being moved to the next column) at a column break. The smallest amount of space
- // shortage we find is the amount with which we will stretch the column height, if it turns out
- // after layout that the columns weren't tall enough.
- void recordSpaceShortage(LayoutUnit spaceShortage);
-
- virtual void updateLogicalWidth() OVERRIDE;
-
- void prepareForLayout();
-
-private:
- RenderMultiColumnSet(RenderFlowThread*);
-
- virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
-
- virtual void paintObject(PaintInfo&, const LayoutPoint& paintOffset) OVERRIDE;
-
- virtual LayoutUnit pageLogicalWidth() const OVERRIDE { return m_computedColumnWidth; }
- virtual LayoutUnit pageLogicalHeight() const OVERRIDE { return m_computedColumnHeight; }
-
- virtual LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const OVERRIDE;
-
- // FIXME: This will change once we have column sets constrained by enclosing pages, etc.
- virtual LayoutUnit logicalHeightOfAllFlowThreadContent() const OVERRIDE { return m_computedColumnHeight; }
-
- // FIXME: For now we return false, but it's likely we will leverage the auto height region code to do column
- // balancing. That's why we have an override of this function that is distinct from RenderRegionSet's override.
- virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; }
-
- virtual void repaintFlowThreadContent(const LayoutRect& repaintRect) const OVERRIDE;
-
- virtual void collectLayerFragments(LayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) OVERRIDE;
-
- virtual const char* renderName() const OVERRIDE;
-
- void paintColumnRules(PaintInfo&, const LayoutPoint& paintOffset);
-
- LayoutUnit columnGap() const;
- LayoutRect columnRectAt(unsigned index) const;
- unsigned columnCount() const;
-
- LayoutRect flowThreadPortionRectAt(unsigned index) const;
- LayoutRect flowThreadPortionOverflowRect(const LayoutRect& flowThreadPortion, unsigned index, unsigned colCount, LayoutUnit colGap) const;
-
- enum ColumnIndexCalculationMode {
- ClampToExistingColumns, // Stay within the range of already existing columns.
- AssumeNewColumns // Allow column indices outside the range of already existing columns.
- };
- unsigned columnIndexAtOffset(LayoutUnit, ColumnIndexCalculationMode = ClampToExistingColumns) const;
-
- void setAndConstrainColumnHeight(LayoutUnit);
-
- unsigned m_computedColumnCount;
- LayoutUnit m_computedColumnWidth;
- LayoutUnit m_computedColumnHeight;
-
- // The following variables are used when balancing the column set.
- LayoutUnit m_maxColumnHeight; // Maximum column height allowed.
- LayoutUnit m_minSpaceShortage; // The smallest amout of space shortage that caused a column break.
- LayoutUnit m_minimumColumnHeight;
- unsigned m_forcedBreaksCount; // FIXME: We will ultimately need to cache more information to balance around forced breaks properly.
- LayoutUnit m_maximumDistanceBetweenForcedBreaks;
- LayoutUnit m_forcedBreakOffset;
-};
-
-DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMultiColumnSet, isRenderMultiColumnSet());
-
-} // namespace WebCore
-
-#endif // RenderMultiColumnSet_h
-
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