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      1 /**
      2  * Copyright (C) 2003, 2006 Apple Computer, Inc.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 #include "core/rendering/EllipsisBox.h"
     22 
     23 #include "core/rendering/HitTestResult.h"
     24 #include "core/rendering/InlineTextBox.h"
     25 #include "core/rendering/PaintInfo.h"
     26 #include "core/rendering/RenderBlock.h"
     27 #include "core/rendering/RootInlineBox.h"
     28 #include "core/rendering/TextPainter.h"
     29 #include "core/rendering/TextRunConstructor.h"
     30 #include "core/rendering/style/ShadowList.h"
     31 #include "platform/fonts/Font.h"
     32 #include "platform/graphics/GraphicsContextStateSaver.h"
     33 #include "platform/text/TextRun.h"
     34 
     35 namespace blink {
     36 
     37 void EllipsisBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
     38 {
     39     GraphicsContext* context = paintInfo.context;
     40     RenderStyle* style = renderer().style(isFirstLineStyle());
     41     const Font& font = style->font();
     42     FloatPoint boxOrigin = locationIncludingFlipping();
     43     boxOrigin.moveBy(FloatPoint(paintOffset));
     44     if (!isHorizontal())
     45         boxOrigin.move(0, -virtualLogicalHeight());
     46     FloatRect boxRect(boxOrigin, LayoutSize(logicalWidth(), virtualLogicalHeight()));
     47     GraphicsContextStateSaver stateSaver(*context);
     48     if (!isHorizontal())
     49         context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Clockwise));
     50     FloatPoint textOrigin(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent());
     51 
     52     bool isPrinting = renderer().document().printing();
     53     bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && selectionState() != RenderObject::SelectionNone;
     54 
     55     if (haveSelection)
     56         paintSelection(context, boxOrigin, style, font);
     57     else if (paintInfo.phase == PaintPhaseSelection)
     58         return;
     59 
     60     TextPainter::Style textStyle = TextPainter::textPaintingStyle(renderer(), style, paintInfo.forceBlackText(), isPrinting);
     61     if (haveSelection)
     62         textStyle = TextPainter::selectionPaintingStyle(renderer(), true, paintInfo.forceBlackText(), isPrinting, textStyle);
     63 
     64     TextRun textRun = constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion);
     65     TextPainter textPainter(context, font, textRun, textOrigin, boxRect, isHorizontal());
     66     textPainter.paint(0, m_str.length(), m_str.length(), textStyle);
     67 
     68     paintMarkupBox(paintInfo, paintOffset, lineTop, lineBottom, style);
     69 }
     70 
     71 InlineBox* EllipsisBox::markupBox() const
     72 {
     73     if (!m_shouldPaintMarkupBox || !renderer().isRenderBlock())
     74         return 0;
     75 
     76     RenderBlock& block = toRenderBlock(renderer());
     77     RootInlineBox* lastLine = block.lineAtIndex(block.lineCount() - 1);
     78     if (!lastLine)
     79         return 0;
     80 
     81     // If the last line-box on the last line of a block is a link, -webkit-line-clamp paints that box after the ellipsis.
     82     // It does not actually move the link.
     83     InlineBox* anchorBox = lastLine->lastChild();
     84     if (!anchorBox || !anchorBox->renderer().style()->isLink())
     85         return 0;
     86 
     87     return anchorBox;
     88 }
     89 
     90 void EllipsisBox::paintMarkupBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, RenderStyle* style)
     91 {
     92     InlineBox* markupBox = this->markupBox();
     93     if (!markupBox)
     94         return;
     95 
     96     LayoutPoint adjustedPaintOffset = paintOffset;
     97     adjustedPaintOffset.move(x() + m_logicalWidth - markupBox->x(),
     98         y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer().style(isFirstLineStyle())->fontMetrics().ascent()));
     99     markupBox->paint(paintInfo, adjustedPaintOffset, lineTop, lineBottom);
    100 }
    101 
    102 IntRect EllipsisBox::selectionRect()
    103 {
    104     RenderStyle* style = renderer().style(isFirstLineStyle());
    105     const Font& font = style->font();
    106     return enclosingIntRect(font.selectionRectForText(constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), IntPoint(logicalLeft(), logicalTop() + root().selectionTopAdjustedForPrecedingBlock()), root().selectionHeightAdjustedForPrecedingBlock()));
    107 }
    108 
    109 void EllipsisBox::paintSelection(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font)
    110 {
    111     Color textColor = renderer().resolveColor(style, CSSPropertyColor);
    112     Color c = renderer().selectionBackgroundColor();
    113     if (!c.alpha())
    114         return;
    115 
    116     // If the text color ends up being the same as the selection background, invert the selection
    117     // background.
    118     if (textColor == c)
    119         c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
    120 
    121     GraphicsContextStateSaver stateSaver(*context);
    122     LayoutUnit selectionBottom = root().selectionBottom();
    123     LayoutUnit top = root().selectionTop();
    124     LayoutUnit h = root().selectionHeight();
    125     const int deltaY = roundToInt(renderer().style()->isFlippedLinesWritingMode() ? selectionBottom - logicalBottom() : logicalTop() - top);
    126     const FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
    127     FloatRect clipRect(localOrigin, FloatSize(m_logicalWidth, h.toFloat()));
    128     context->clip(clipRect);
    129     context->drawHighlightForText(font, constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), localOrigin, h, c);
    130 }
    131 
    132 bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
    133 {
    134     LayoutPoint adjustedLocation = accumulatedOffset + roundedLayoutPoint(topLeft());
    135 
    136     // Hit test the markup box.
    137     if (InlineBox* markupBox = this->markupBox()) {
    138         RenderStyle* style = renderer().style(isFirstLineStyle());
    139         LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
    140         LayoutUnit mty = adjustedLocation.y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer().style(isFirstLineStyle())->fontMetrics().ascent());
    141         if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom)) {
    142             renderer().updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
    143             return true;
    144         }
    145     }
    146 
    147     FloatPoint boxOrigin = locationIncludingFlipping();
    148     boxOrigin.moveBy(accumulatedOffset);
    149     FloatRect boundsRect(boxOrigin, size());
    150     if (visibleToHitTestRequest(request) && boundsRect.intersects(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0))) {
    151         renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
    152         if (!result.addNodeToRectBasedTestResult(renderer().node(), request, locationInContainer, boundsRect))
    153             return true;
    154     }
    155 
    156     return false;
    157 }
    158 
    159 } // namespace blink
    160