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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/RenderBlockFlow.h"
     27 #include "core/rendering/RootInlineBox.h"
     28 #include "core/rendering/style/ShadowList.h"
     29 #include "platform/fonts/Font.h"
     30 #include "platform/graphics/DrawLooper.h"
     31 #include "platform/graphics/GraphicsContextStateSaver.h"
     32 #include "platform/text/TextRun.h"
     33 
     34 namespace WebCore {
     35 
     36 void EllipsisBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
     37 {
     38     GraphicsContext* context = paintInfo.context;
     39     RenderStyle* style = m_renderer->style(isFirstLineStyle());
     40 
     41     const Font& font = style->font();
     42     FloatPoint boxOrigin = locationIncludingFlipping();
     43     LayoutPoint adjustedPaintOffset = paintOffset;
     44     if (!isHorizontal())
     45         adjustedPaintOffset.move(0, -virtualLogicalHeight());
     46     boxOrigin.move(adjustedPaintOffset.x(), adjustedPaintOffset.y());
     47     FloatRect boxRect(boxOrigin, LayoutSize(logicalWidth(), virtualLogicalHeight()));
     48     GraphicsContextStateSaver stateSaver(*context);
     49     if (!isHorizontal())
     50         context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Clockwise));
     51     FloatPoint textOrigin = FloatPoint(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent());
     52 
     53     Color styleTextColor = m_renderer->resolveColor(style, CSSPropertyWebkitTextFillColor);
     54     if (styleTextColor != context->fillColor())
     55         context->setFillColor(styleTextColor);
     56 
     57     if (selectionState() != RenderObject::SelectionNone) {
     58         paintSelection(context, boxOrigin, style, font);
     59 
     60         // Select the correct color for painting the text.
     61         Color foreground = paintInfo.forceBlackText() ? Color::black : renderer()->selectionForegroundColor();
     62         if (foreground.isValid() && foreground != styleTextColor)
     63             context->setFillColor(foreground);
     64     }
     65 
     66     // Text shadows are disabled when printing. http://crbug.com/258321
     67     const ShadowList* shadowList = context->printing() ? 0 : style->textShadow();
     68     bool hasShadow = shadowList;
     69     if (hasShadow) {
     70         DrawLooper drawLooper;
     71         for (size_t i = shadowList->shadows().size(); i--; ) {
     72             const ShadowData& shadow = shadowList->shadows()[i];
     73             int shadowX = isHorizontal() ? shadow.x() : shadow.y();
     74             int shadowY = isHorizontal() ? shadow.y() : -shadow.x();
     75             FloatSize offset(shadowX, shadowY);
     76             drawLooper.addShadow(offset, shadow.blur(), m_renderer->resolveColor(shadow.color()),
     77                 DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
     78         }
     79         drawLooper.addUnmodifiedContent();
     80         context->setDrawLooper(drawLooper);
     81     }
     82 
     83     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
     84     TextRun textRun = RenderBlockFlow::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion);
     85     TextRunPaintInfo textRunPaintInfo(textRun);
     86     textRunPaintInfo.bounds = boxRect;
     87     context->drawText(font, textRunPaintInfo, textOrigin);
     88 
     89     // Restore the regular fill color.
     90     if (styleTextColor != context->fillColor())
     91         context->setFillColor(styleTextColor);
     92 
     93     if (hasShadow)
     94         context->clearDrawLooper();
     95 
     96     paintMarkupBox(paintInfo, paintOffset, lineTop, lineBottom, style);
     97 }
     98 
     99 InlineBox* EllipsisBox::markupBox() const
    100 {
    101     if (!m_shouldPaintMarkupBox || !m_renderer->isRenderBlock())
    102         return 0;
    103 
    104     RenderBlock* block = toRenderBlock(m_renderer);
    105     RootInlineBox* lastLine = block->lineAtIndex(block->lineCount() - 1);
    106     if (!lastLine)
    107         return 0;
    108 
    109     // If the last line-box on the last line of a block is a link, -webkit-line-clamp paints that box after the ellipsis.
    110     // It does not actually move the link.
    111     InlineBox* anchorBox = lastLine->lastChild();
    112     if (!anchorBox || !anchorBox->renderer()->style()->isLink())
    113         return 0;
    114 
    115     return anchorBox;
    116 }
    117 
    118 void EllipsisBox::paintMarkupBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, RenderStyle* style)
    119 {
    120     InlineBox* markupBox = this->markupBox();
    121     if (!markupBox)
    122         return;
    123 
    124     LayoutPoint adjustedPaintOffset = paintOffset;
    125     adjustedPaintOffset.move(x() + m_logicalWidth - markupBox->x(),
    126         y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer()->style(isFirstLineStyle())->fontMetrics().ascent()));
    127     markupBox->paint(paintInfo, adjustedPaintOffset, lineTop, lineBottom);
    128 }
    129 
    130 IntRect EllipsisBox::selectionRect()
    131 {
    132     RenderStyle* style = m_renderer->style(isFirstLineStyle());
    133     const Font& font = style->font();
    134     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
    135     return enclosingIntRect(font.selectionRectForText(RenderBlockFlow::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), IntPoint(logicalLeft(), logicalTop() + root()->selectionTopAdjustedForPrecedingBlock()), root()->selectionHeightAdjustedForPrecedingBlock()));
    136 }
    137 
    138 void EllipsisBox::paintSelection(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font)
    139 {
    140     Color textColor = m_renderer->resolveColor(style, CSSPropertyColor);
    141     Color c = m_renderer->selectionBackgroundColor();
    142     if (!c.isValid() || !c.alpha())
    143         return;
    144 
    145     // If the text color ends up being the same as the selection background, invert the selection
    146     // background.
    147     if (textColor == c)
    148         c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
    149 
    150     GraphicsContextStateSaver stateSaver(*context);
    151     LayoutUnit selectionBottom = root()->selectionBottom();
    152     LayoutUnit top = root()->selectionTop();
    153     LayoutUnit h = root()->selectionHeight();
    154     const int deltaY = roundToInt(renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom - logicalBottom() : logicalTop() - top);
    155     const FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
    156     FloatRect clipRect(localOrigin, FloatSize(m_logicalWidth, h));
    157     alignSelectionRectToDevicePixels(clipRect);
    158     context->clip(clipRect);
    159     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
    160     context->drawHighlightForText(font, RenderBlockFlow::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), localOrigin, h, c);
    161 }
    162 
    163 bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
    164 {
    165     LayoutPoint adjustedLocation = accumulatedOffset + roundedLayoutPoint(topLeft());
    166 
    167     // Hit test the markup box.
    168     if (InlineBox* markupBox = this->markupBox()) {
    169         RenderStyle* style = m_renderer->style(isFirstLineStyle());
    170         LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
    171         LayoutUnit mty = adjustedLocation.y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer()->style(isFirstLineStyle())->fontMetrics().ascent());
    172         if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom)) {
    173             renderer()->updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
    174             return true;
    175         }
    176     }
    177 
    178     FloatPoint boxOrigin = locationIncludingFlipping();
    179     boxOrigin.moveBy(accumulatedOffset);
    180     FloatRect boundsRect(boxOrigin, size());
    181     if (visibleToHitTestRequest(request) && boundsRect.intersects(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0))) {
    182         renderer()->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
    183         if (!result.addNodeToRectBasedTestResult(renderer()->node(), request, locationInContainer, boundsRect))
    184             return true;
    185     }
    186 
    187     return false;
    188 }
    189 
    190 } // namespace WebCore
    191