third_party/WebKit/Source/core/paint/FileUploadControlPainter.cpp

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/paint/FileUploadControlPainter.h"

#include "core/layout/LayoutButton.h"
#include "core/layout/LayoutFileUploadControl.h"
#include "core/layout/TextRunConstructor.h"
#include "core/paint/LayoutObjectDrawingRecorder.h"
#include "core/paint/PaintInfo.h"
#include "platform/graphics/paint/ClipRecorder.h"
#include "wtf/Optional.h"

namespace blink {

const int buttonShadowHeight = 2;

void FileUploadControlPainter::paintObject(const PaintInfo& paintInfo,
                                           const LayoutPoint& paintOffset) {
  if (m_layoutFileUploadControl.style()->visibility() != EVisibility::Visible)
    return;

  // Push a clip.
  Optional<ClipRecorder> clipRecorder;
  if (paintInfo.phase == PaintPhaseForeground ||
      paintInfo.phase == PaintPhaseDescendantBlockBackgroundsOnly) {
    IntRect clipRect = enclosingIntRect(LayoutRect(
        LayoutPoint(paintOffset.x() + m_layoutFileUploadControl.borderLeft(),
                    paintOffset.y() + m_layoutFileUploadControl.borderTop()),
        m_layoutFileUploadControl.size() +
            LayoutSize(0, -m_layoutFileUploadControl.borderWidth() +
                              buttonShadowHeight)));
    if (clipRect.isEmpty())
      return;
    clipRecorder.emplace(paintInfo.context, m_layoutFileUploadControl,
                         DisplayItem::kClipFileUploadControlRect, clipRect);
  }

  if (paintInfo.phase == PaintPhaseForeground &&
      !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(
          paintInfo.context, m_layoutFileUploadControl, paintInfo.phase)) {
    const String& displayedFilename = m_layoutFileUploadControl.fileTextValue();
    const Font& font = m_layoutFileUploadControl.style()->font();
    TextRun textRun = constructTextRun(
        font, displayedFilename, m_layoutFileUploadControl.styleRef(),
        RespectDirection | RespectDirectionOverride);
    textRun.setExpansionBehavior(TextRun::AllowTrailingExpansion);

    // Determine where the filename should be placed
    LayoutUnit contentLeft = paintOffset.x() +
                             m_layoutFileUploadControl.borderLeft() +
                             m_layoutFileUploadControl.paddingLeft();
    Node* button = m_layoutFileUploadControl.uploadButton();
    if (!button)
      return;

    int buttonWidth = (button && button->layoutBox())
                          ? button->layoutBox()->pixelSnappedWidth()
                          : 0;
    LayoutUnit buttonAndSpacingWidth(
        buttonWidth + LayoutFileUploadControl::afterButtonSpacing);
    float textWidth = font.width(textRun);
    LayoutUnit textX;
    if (m_layoutFileUploadControl.style()->isLeftToRightDirection())
      textX = contentLeft + buttonAndSpacingWidth;
    else
      textX =
          LayoutUnit(contentLeft + m_layoutFileUploadControl.contentWidth() -
                     buttonAndSpacingWidth - textWidth);

    LayoutUnit textY;
    // We want to match the button's baseline
    // FIXME: Make this work with transforms.
    if (LayoutButton* buttonLayoutObject =
            toLayoutButton(button->layoutObject()))
      textY = paintOffset.y() + m_layoutFileUploadControl.borderTop() +
              m_layoutFileUploadControl.paddingTop() +
              buttonLayoutObject->baselinePosition(AlphabeticBaseline, true,
                                                   HorizontalLine,
                                                   PositionOnContainingLine);
    else
      textY = LayoutUnit(m_layoutFileUploadControl.baselinePosition(
          AlphabeticBaseline, true, HorizontalLine, PositionOnContainingLine));
    TextRunPaintInfo textRunPaintInfo(textRun);

    const SimpleFontData* fontData =
        m_layoutFileUploadControl.style()->font().primaryFont();
    if (!fontData)
      return;
    // FIXME: Shouldn't these offsets be rounded? crbug.com/350474
    textRunPaintInfo.bounds = FloatRect(
        textX.toFloat(), textY.toFloat() - fontData->getFontMetrics().ascent(),
        textWidth, fontData->getFontMetrics().height());

    // Draw the filename.
    LayoutObjectDrawingRecorder recorder(
        paintInfo.context, m_layoutFileUploadControl, paintInfo.phase,
        textRunPaintInfo.bounds);
    paintInfo.context.setFillColor(
        m_layoutFileUploadControl.resolveColor(CSSPropertyColor));
    paintInfo.context.drawBidiText(
        font, textRunPaintInfo,
        FloatPoint(roundToInt(textX), roundToInt(textY)));
  }

  // Paint the children.
  m_layoutFileUploadControl.LayoutBlockFlow::paintObject(paintInfo,
                                                         paintOffset);
}

}  // namespace blink