Imported WebKit commit 7e538425aa020340619e927792f3d895061fb54b (http://svn.webkit.org/repository/webkit/trunk@116286)

1 files changed, 91 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/RenderMultiColumnBlock.cpp b/Source/WebCore/rendering/RenderMultiColumnBlock.cpp
new file mode 100644
index 000000000..d29055e68
--- /dev/null
+++ b/Source/WebCore/rendering/RenderMultiColumnBlock.cpp
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "RenderMultiColumnBlock.h"
+
+using namespace std;
+
+namespace WebCore {
+
+RenderMultiColumnBlock::RenderMultiColumnBlock(Node* node)
+    : RenderBlock(node)
+    , m_columnCount(1)
+    , m_columnWidth(0)
+{
+}
+
+void RenderMultiColumnBlock::computeColumnCountAndWidth()
+{
+    // Calculate our column width and column count.
+    // FIXME: Can overflow on fast/block/float/float-not-removed-from-next-sibling4.html, see https://bugs.webkit.org/show_bug.cgi?id=68744
+    m_columnCount = 1;
+    m_columnWidth = contentLogicalWidth();
+    
+    ASSERT(!style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth());
+
+    LayoutUnit availWidth = m_columnWidth;
+    LayoutUnit colGap = columnGap();
+    LayoutUnit colWidth = max<LayoutUnit>(1, LayoutUnit(style()->columnWidth()));
+    int colCount = max<int>(1, style()->columnCount());
+
+    if (style()->hasAutoColumnWidth() && !style()->hasAutoColumnCount()) {
+        m_columnCount = colCount;
+        m_columnWidth = max<LayoutUnit>(0, (availWidth - ((m_columnCount - 1) * colGap)) / m_columnCount);
+    } else if (!style()->hasAutoColumnWidth() && style()->hasAutoColumnCount()) {
+        m_columnCount = max<LayoutUnit>(1, (availWidth + colGap) / (colWidth + colGap));
+        m_columnWidth = ((availWidth + colGap) / m_columnCount) - colGap;
+    } else {
+        m_columnCount = max<LayoutUnit>(min<LayoutUnit>(colCount, (availWidth + colGap) / (colWidth + colGap)), 1);
+        m_columnWidth = ((availWidth + colGap) / m_columnCount) - colGap;
+    }
+}
+
+bool RenderMultiColumnBlock::recomputeLogicalWidth()
+{
+    bool relayoutChildren = RenderBlock::recomputeLogicalWidth();
+    LayoutUnit oldColumnWidth = m_columnWidth;
+    computeColumnCountAndWidth();
+    if (m_columnWidth != oldColumnWidth)
+        relayoutChildren = true;
+    return relayoutChildren;
+}
+
+const char* RenderMultiColumnBlock::renderName() const
+{    
+    if (isFloating())
+        return "RenderMultiColumnBlock (floating)";
+    if (isPositioned())
+        return "RenderMultiColumnBlock (positioned)";
+    if (isAnonymousBlock())
+        return "RenderMultiColumnBlock (anonymous)";
+    if (isAnonymous())
+        return "RenderMultiColumnBlock (generated)";
+    if (isRelPositioned())
+        return "RenderMultiColumnBlock (relative positioned)";
+    return "RenderMultiColumnBlock";
+}
+
+}