Use isHTMLTextAreaElement and toHTMLTextAreaElement

Source/core/rendering/RenderTextControlMultiLine.cpp

 /**
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 18 matching lines @@
 
 RenderTextControlMultiLine::RenderTextControlMultiLine(HTMLTextAreaElement* element)
     : RenderTextControl(element)
 {
     ASSERT(element);
 }
 
 RenderTextControlMultiLine::~RenderTextControlMultiLine()
 {
     if (node() && node()->inDocument())
-        static_cast<HTMLTextAreaElement*>(node())->rendererWillBeDestroyed();
+        toHTMLTextAreaElement(node())->rendererWillBeDestroyed();
 }
 
 bool RenderTextControlMultiLine::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     if (!RenderTextControl::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction))
         return false;
 
     if (result.innerNode() == node() || result.innerNode() == innerTextElement())
         hitInnerTextElement(result, locationInContainer.point(), accumulatedOffset);
 
     return true;
 }
 
 float RenderTextControlMultiLine::getAvgCharWidth(AtomicString family)
 {
     // Since Lucida Grande is the default font, we want this to match the width
     // of Courier New, the default font for textareas in IE, Firefox and Safari Win.
     // 1229 is the avgCharWidth value in the OS/2 table for Courier New.
     if (family == "Lucida Grande")
         return scaleEmToUnits(1229);
 
     return RenderTextControl::getAvgCharWidth(family);
 }
 
 LayoutUnit RenderTextControlMultiLine::preferredContentLogicalWidth(float charWidth) const
 {
-    int factor = static_cast<HTMLTextAreaElement*>(node())->cols();
+    int factor = toHTMLTextAreaElement(node())->cols();
     return static_cast<LayoutUnit>(ceilf(charWidth * factor)) + scrollbarThickness();
 }
 
 LayoutUnit RenderTextControlMultiLine::computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const
 {
-    return lineHeight * static_cast<HTMLTextAreaElement*>(node())->rows() + nonContentHeight;
+    return lineHeight * toHTMLTextAreaElement(node())->rows() + nonContentHeight;
 }
 
 int RenderTextControlMultiLine::baselinePosition(FontBaseline baselineType, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
 {
     return RenderBox::baselinePosition(baselineType, firstLine, direction, linePositionMode);
 }
 
 PassRefPtr<RenderStyle> RenderTextControlMultiLine::createInnerTextStyle(const RenderStyle* startStyle) const
 {
     RefPtr<RenderStyle> textBlockStyle = RenderStyle::create();
@@ skipping 18 matching lines @@
         return placeholderRenderer;
     RenderBox* placeholderBox = toRenderBox(placeholderRenderer);
     placeholderBox->style()->setLogicalWidth(Length(contentLogicalWidth() - placeholderBox->borderAndPaddingLogicalWidth(), Fixed));
     placeholderBox->layoutIfNeeded();
     placeholderBox->setX(borderLeft() + paddingLeft());
     placeholderBox->setY(borderTop() + paddingTop());
     return placeholderRenderer;
 }
     
 }