Update <select> when any of its <option> children has "display: none"

Source/core/rendering/RenderListBox.cpp

Index: Source/core/rendering/RenderListBox.cpp
diff --git a/Source/core/rendering/RenderListBox.cpp b/Source/core/rendering/RenderListBox.cpp
index 62ea8e322834d54801574a75c7bcb723efb72a75..1fe6a7801967fdca44dfc2dd691922573f8b95ff 100644
--- a/Source/core/rendering/RenderListBox.cpp
+++ b/Source/core/rendering/RenderListBox.cpp
@@ -87,6 +87,7 @@ RenderListBox::RenderListBox(Element* element)
     , m_inAutoscroll(false)
     , m_optionsWidth(0)
     , m_indexOffset(0)
+    , m_listItemCount(0)
 {
     ASSERT(element);
     ASSERT(element->isHTMLElement());
@@ -119,14 +120,20 @@ inline HTMLSelectElement* RenderListBox::selectElement() const
 void RenderListBox::updateFromElement()
 {
     FontCachePurgePreventer fontCachePurgePreventer;
-
     if (m_optionsChanged) {
         const Vector<HTMLElement*>& listItems = selectElement()->listItems();
-        int size = numItems();
+        int size = static_cast<int>(listItems.size());
 
         float width = 0;
+
+        m_listItemCount = 0;
         for (int i = 0; i < size; ++i) {
             HTMLElement* element = listItems[i];
+            RenderStyle* listItemStyle = element->renderStyle();
+            if (listItemStyle && listItemStyle->display() == NONE)
+                continue;
+
+            ++m_listItemCount;
             String text;
             Font itemFont = style()->font();
             if (isHTMLOptionElement(*element)) {
@@ -202,8 +209,9 @@ void RenderListBox::scrollToRevealSelection()
 
     m_scrollToRevealSelectionAfterLayout = false;
 
-    int firstIndex = select->activeSelectionStartListIndex();
-    if (firstIndex >= 0 && !listIndexIsVisible(select->activeSelectionEndListIndex()))
+    int firstIndex = toRenderListBoxIndex(select->activeSelectionStartListIndex());
+    int lastIndex = toRenderListBoxIndex(select->activeSelectionEndListIndex());
+    if (firstIndex >= 0 && !listIndexIsVisible(lastIndex))
         scrollToRevealElementAtListIndex(firstIndex);
 }
 
@@ -262,7 +270,7 @@ int RenderListBox::numVisibleItems() const
 
 int RenderListBox::numItems() const
 {
-    return selectElement()->listItems().size();
+    return m_listItemCount;
 }
 
 LayoutUnit RenderListBox::listHeight() const
@@ -281,7 +289,7 @@ int RenderListBox::baselinePosition(FontBaseline baselineType, bool firstLine, L
     return RenderBox::baselinePosition(baselineType, firstLine, lineDirection, linePositionMode) - baselineAdjustment;
 }
 
-LayoutRect RenderListBox::itemBoundingBoxRect(const LayoutPoint& additionalOffset, int index)
+LayoutRect RenderListBox::itemBoundingBoxRect(const LayoutPoint& additionalOffset, int index) const
 {
     // For RTL, items start after the left-side vertical scrollbar.
     int scrollbarOffset = style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft() ? verticalScrollbarWidth() : 0;
@@ -351,7 +359,7 @@ void RenderListBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint&
     int size = numItems();
     const Vector<HTMLElement*>& listItems = select->listItems();
     for (int i = 0; i < size; ++i) {
-        HTMLElement* element = listItems[i];
+        HTMLElement* element = listItems[toOptionListIndex(i)];
         if (isHTMLOptionElement(*element) && !element->isDisabledFormControl()) {
             rects.append(pixelSnappedIntRect(itemBoundingBoxRect(additionalOffset, i)));
             return;
@@ -408,7 +416,7 @@ void RenderListBox::paintItemForeground(PaintInfo& paintInfo, const LayoutPoint&
     HTMLSelectElement* select = selectElement();
 
     const Vector<HTMLElement*>& listItems = select->listItems();
-    HTMLElement* element = listItems[listIndex];
+    HTMLElement* element = listItems[toOptionListIndex(listIndex)];
 
     RenderStyle* itemStyle = element->renderStyle();
     if (!itemStyle)
@@ -457,7 +465,7 @@ void RenderListBox::paintItemForeground(PaintInfo& paintInfo, const LayoutPoint&
 void RenderListBox::paintItemBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset, int listIndex)
 {
     const Vector<HTMLElement*>& listItems = selectElement()->listItems();
-    HTMLElement* element = listItems[listIndex];
+    HTMLElement* element = listItems[toOptionListIndex(listIndex)];
 
     Color backColor;
     if (isHTMLOptionElement(*element) && ((toHTMLOptionElement(*element).selected() && selectElement()->suggestedIndex() < 0) || listIndex == selectElement()->suggestedIndex())) {
@@ -494,7 +502,7 @@ bool RenderListBox::isPointInOverflowControl(HitTestResult& result, const Layout
     return false;
 }
 
-int RenderListBox::listIndexAtOffset(const LayoutSize& offset)
+int RenderListBox::listIndexAtOffset(const LayoutSize& offset) const
 {
     if (!numItems())
         return -1;
@@ -510,7 +518,7 @@ int RenderListBox::listIndexAtOffset(const LayoutSize& offset)
         return -1;
 
     int newOffset = (offset.height() - borderTop() - paddingTop()) / itemHeight() + m_indexOffset;
-    return newOffset < numItems() ? newOffset : -1;
+    return newOffset < numItems() ? toOptionListIndex(newOffset) : -1;
 }
 
 void RenderListBox::panScroll(const IntPoint& panStartMousePosition)
@@ -589,9 +597,9 @@ void RenderListBox::autoscroll(const IntPoint&)
         m_inAutoscroll = true;
 
         if (!select->multiple())
-            select->setActiveSelectionAnchorIndex(endIndex);
+            select->setActiveSelectionAnchorIndex(toOptionListIndex(endIndex));
 
-        select->setActiveSelectionEndIndex(endIndex);
+        select->setActiveSelectionEndIndex(toOptionListIndex(endIndex));
         select->updateListBoxSelection(!select->multiple());
         m_inAutoscroll = false;
     }
@@ -621,7 +629,7 @@ bool RenderListBox::scrollToRevealElementAtListIndex(int index)
     return true;
 }
 
-bool RenderListBox::listIndexIsVisible(int index)
+bool RenderListBox::listIndexIsVisible(int index) const
 {
     return index >= m_indexOffset && index < m_indexOffset + numVisibleItems();
 }
@@ -718,7 +726,7 @@ bool RenderListBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& re
 
     for (int i = 0; i < size; ++i) {
         if (itemBoundingBoxRect(adjustedLocation, i).contains(locationInContainer.point())) {
-            if (Element* node = listItems[i]) {
+            if (Element* node = listItems[toOptionListIndex(i)]) {
                 result.setInnerNode(node);
                 if (!result.innerNonSharedNode())
                     result.setInnerNonSharedNode(node);
@@ -949,4 +957,47 @@ void RenderListBox::setHasVerticalScrollbar(bool hasScrollbar)
         document().setAnnotatedRegionsDirty(true);
 }
 
+int RenderListBox::toOptionListIndex(int index) const

[keishi, 2014/04/11 06:40:13]

We have lots of indexes so it would be great if we could tell what index we are
converting from. e.g. renderListBoxIndexToOptionIndex

[spartha, 2014/04/11 11:19:45]

Done.

+{
+    const Vector<HTMLElement*>& listItems = selectElement()->listItems();
+    const int size = static_cast<int>(listItems.size());
+
+    if (size == numItems())
+        return index;
+
+    int rendererIndex = 0;
+    int i = 0;
+    for (; i < size; ++i) {
+        HTMLElement* element = listItems[i];
+        RenderStyle* listItemStyle = element->renderStyle();
+        if (listItemStyle && listItemStyle->display() == NONE)
+            continue;
+        if (index == rendererIndex)
+            break;
+        ++rendererIndex;
+    }
+    return i;
+}
+
+int RenderListBox::toRenderListBoxIndex(int index) const
+{
+    const Vector<HTMLElement*>& listItems = selectElement()->listItems();
+    const int size = static_cast<int>(listItems.size());
+
+    if (size == numItems())
+        return index;
+
+    int realIndex = 0;
+    for (int i = 0; i < size; ++i) {
+        HTMLElement* element = listItems[i];
+        RenderStyle* listItemStyle = element->renderStyle();
+        if (listItemStyle && listItemStyle->display() == NONE)
+            continue;
+        if (index == i)
+            break;
+        ++realIndex;
+    }
+    return realIndex;
+}
+
 } // namespace WebCore