third_party/WebKit/Source/core/layout/LayoutTextControlMultiLine.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,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "core/layout/LayoutTextControlMultiLine.h"

#include "core/html/HTMLTextAreaElement.h"
#include "core/layout/HitTestResult.h"
#include "core/layout/LayoutTheme.h"

namespace blink {

LayoutTextControlMultiLine::LayoutTextControlMultiLine(
    HTMLTextAreaElement* element)
    : LayoutTextControl(element) {
  ASSERT(element);
}

LayoutTextControlMultiLine::~LayoutTextControlMultiLine() {}

bool LayoutTextControlMultiLine::nodeAtPoint(
    HitTestResult& result,
    const HitTestLocation& locationInContainer,
    const LayoutPoint& accumulatedOffset,
    HitTestAction hitTestAction) {
  if (!LayoutTextControl::nodeAtPoint(result, locationInContainer,
                                      accumulatedOffset, hitTestAction))
    return false;

  if (result.innerNode() == node() ||
      result.innerNode() == innerEditorElement())
    hitInnerEditorElement(result, locationInContainer.point(),
                          accumulatedOffset);

  return true;
}

float LayoutTextControlMultiLine::getAvgCharWidth(
    const AtomicString& family) const {
  // Match the default system font to the width of MS Shell Dlg, the default
  // font for textareas in Firefox, Safari Win and IE for some encodings (in
  // IE, the default font is encoding specific). 1229 is the avgCharWidth
  // value in the OS/2 table for Courier New.
  if (LayoutTheme::theme().needsHackForTextControlWithFontFamily(family))
    return scaleEmToUnits(1229);

  return LayoutTextControl::getAvgCharWidth(family);
}

LayoutUnit LayoutTextControlMultiLine::preferredContentLogicalWidth(
    float charWidth) const {
  int factor = toHTMLTextAreaElement(node())->cols();
  return static_cast<LayoutUnit>(ceilf(charWidth * factor)) +
         scrollbarThickness();
}

LayoutUnit LayoutTextControlMultiLine::computeControlLogicalHeight(
    LayoutUnit lineHeight,
    LayoutUnit nonContentHeight) const {
  return lineHeight * toHTMLTextAreaElement(node())->rows() + nonContentHeight;
}

int LayoutTextControlMultiLine::baselinePosition(
    FontBaseline baselineType,
    bool firstLine,
    LineDirectionMode direction,
    LinePositionMode linePositionMode) const {
  return LayoutBox::baselinePosition(baselineType, firstLine, direction,
                                     linePositionMode);
}

PassRefPtr<ComputedStyle> LayoutTextControlMultiLine::createInnerEditorStyle(
    const ComputedStyle& startStyle) const {
  RefPtr<ComputedStyle> textBlockStyle = ComputedStyle::create();
  textBlockStyle->inheritFrom(startStyle);
  adjustInnerEditorStyle(*textBlockStyle);
  textBlockStyle->setDisplay(EDisplay::Block);
  textBlockStyle->setUnique(true);

  return textBlockStyle.release();
}

LayoutObject* LayoutTextControlMultiLine::layoutSpecialExcludedChild(
    bool relayoutChildren,
    SubtreeLayoutScope& layoutScope) {
  LayoutObject* placeholderLayoutObject =
      LayoutTextControl::layoutSpecialExcludedChild(relayoutChildren,
                                                    layoutScope);
  if (!placeholderLayoutObject)
    return nullptr;
  if (!placeholderLayoutObject->isBox())
    return placeholderLayoutObject;
  LayoutBox* placeholderBox = toLayoutBox(placeholderLayoutObject);
  placeholderBox->mutableStyleRef().setLogicalWidth(Length(
      contentLogicalWidth() - placeholderBox->borderAndPaddingLogicalWidth(),
      Fixed));
  placeholderBox->layoutIfNeeded();
  placeholderBox->setX(borderLeft() + paddingLeft());
  placeholderBox->setY(borderTop() + paddingTop());
  return placeholderLayoutObject;
}

}  // namespace blink