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
35namespace blink {
36
37void 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
71InlineBox* 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
90void 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
102IntRect 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
109void 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
132bool 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