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| 1 /* | |
| 2 * Copyright (C) 2012 Victor Carbune (victor@rosedu.org) | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #include "config.h" | |
| 27 #include "core/rendering/RenderTextTrackCue.h" | |
| 28 | |
| 29 #include "core/html/track/TextTrackCue.h" | |
| 30 #include "core/rendering/LayoutRectRecorder.h" | |
| 31 #include "core/rendering/RenderView.h" | |
| 32 | |
| 33 namespace WebCore { | |
| 34 | |
| 35 RenderTextTrackCue::RenderTextTrackCue(TextTrackCueBox* element) | |
| 36 : RenderBlockFlow(element) | |
| 37 , m_cue(element->getCue()) | |
| 38 { | |
| 39 } | |
| 40 | |
| 41 void RenderTextTrackCue::layout() | |
| 42 { | |
| 43 LayoutRectRecorder recorder(*this); | |
| 44 RenderBlockFlow::layout(); | |
| 45 | |
| 46 // If WebVTT Regions are used, the regular WebVTT layout algorithm is no | |
| 47 // longer necessary, since cues having the region parameter set do not have | |
| 48 // any positioning parameters. Also, in this case, the regions themselves | |
| 49 // have positioning information. | |
| 50 if (!m_cue->regionId().isEmpty()) | |
| 51 return; | |
| 52 | |
| 53 LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransfo
rm() || hasReflection() || style()->isFlippedBlocksWritingMode()); | |
| 54 | |
| 55 if (m_cue->snapToLines()) | |
| 56 repositionCueSnapToLinesSet(); | |
| 57 else | |
| 58 repositionCueSnapToLinesNotSet(); | |
| 59 | |
| 60 statePusher.pop(); | |
| 61 } | |
| 62 | |
| 63 bool RenderTextTrackCue::findFirstLineBox(InlineFlowBox*& firstLineBox) | |
| 64 { | |
| 65 if (firstChild()->isRenderInline()) | |
| 66 firstLineBox = toRenderInline(firstChild())->firstLineBox(); | |
| 67 else | |
| 68 return false; | |
| 69 | |
| 70 return true; | |
| 71 } | |
| 72 | |
| 73 bool RenderTextTrackCue::initializeLayoutParameters(InlineFlowBox* firstLineBox,
LayoutUnit& step, LayoutUnit& position) | |
| 74 { | |
| 75 ASSERT(firstChild()); | |
| 76 | |
| 77 RenderBlock* parentBlock = containingBlock(); | |
| 78 | |
| 79 // 1. Horizontal: Let step be the height of the first line box in boxes. | |
| 80 // Vertical: Let step be the width of the first line box in boxes. | |
| 81 step = m_cue->getWritingDirection() == TextTrackCue::Horizontal ? firstLineB
ox->height() : firstLineBox->width(); | |
| 82 | |
| 83 // 2. If step is zero, then jump to the step labeled done positioning below. | |
| 84 if (!step) | |
| 85 return false; | |
| 86 | |
| 87 // 3. Let line position be the text track cue computed line position. | |
| 88 int linePosition = m_cue->calculateComputedLinePosition(); | |
| 89 | |
| 90 // 4. Vertical Growing Left: Add one to line position then negate it. | |
| 91 if (m_cue->getWritingDirection() == TextTrackCue::VerticalGrowingLeft) | |
| 92 linePosition = -(linePosition + 1); | |
| 93 | |
| 94 // 5. Let position be the result of multiplying step and line position. | |
| 95 position = step * linePosition; | |
| 96 | |
| 97 // 6. Vertical Growing Left: Decrease position by the width of the | |
| 98 // bounding box of the boxes in boxes, then increase position by step. | |
| 99 if (m_cue->getWritingDirection() == TextTrackCue::VerticalGrowingLeft) { | |
| 100 position -= width(); | |
| 101 position += step; | |
| 102 } | |
| 103 | |
| 104 // 7. If line position is less than zero... | |
| 105 if (linePosition < 0) { | |
| 106 // Horizontal / Vertical: ... then increase position by the | |
| 107 // height / width of the video's rendering area ... | |
| 108 position += m_cue->getWritingDirection() == TextTrackCue::Horizontal ? p
arentBlock->height() : parentBlock->width(); | |
| 109 | |
| 110 // ... and negate step. | |
| 111 step = -step; | |
| 112 } | |
| 113 | |
| 114 return true; | |
| 115 } | |
| 116 | |
| 117 void RenderTextTrackCue::placeBoxInDefaultPosition(LayoutUnit position, bool& sw
itched) | |
| 118 { | |
| 119 // 8. Move all boxes in boxes ... | |
| 120 if (m_cue->getWritingDirection() == TextTrackCue::Horizontal) | |
| 121 // Horizontal: ... down by the distance given by position | |
| 122 setY(y() + position); | |
| 123 else | |
| 124 // Vertical: ... right by the distance given by position | |
| 125 setX(x() + position); | |
| 126 | |
| 127 // 9. Default: Remember the position of all the boxes in boxes as their | |
| 128 // default position. | |
| 129 m_fallbackPosition = FloatPoint(x(), y()); | |
| 130 | |
| 131 // 10. Let switched be false. | |
| 132 switched = false; | |
| 133 } | |
| 134 | |
| 135 bool RenderTextTrackCue::isOutside() const | |
| 136 { | |
| 137 return !containingBlock()->absoluteBoundingBoxRect().contains(absoluteConten
tBox()); | |
| 138 } | |
| 139 | |
| 140 bool RenderTextTrackCue::isOverlapping() const | |
| 141 { | |
| 142 for (RenderObject* box = previousSibling(); box; box = box->previousSibling(
)) { | |
| 143 IntRect boxRect = box->absoluteBoundingBoxRect(); | |
| 144 | |
| 145 if (absoluteBoundingBoxRect().intersects(boxRect)) | |
| 146 return true; | |
| 147 } | |
| 148 | |
| 149 return false; | |
| 150 } | |
| 151 | |
| 152 bool RenderTextTrackCue::shouldSwitchDirection(InlineFlowBox* firstLineBox, Layo
utUnit step) const | |
| 153 { | |
| 154 LayoutUnit top = y(); | |
| 155 LayoutUnit left = x(); | |
| 156 LayoutUnit bottom = top + firstLineBox->height(); | |
| 157 LayoutUnit right = left + firstLineBox->width(); | |
| 158 | |
| 159 // 12. Horizontal: If step is negative and the top of the first line | |
| 160 // box in boxes is now above the top of the video's rendering area, | |
| 161 // or if step is positive and the bottom of the first line box in | |
| 162 // boxes is now below the bottom of the video's rendering area, jump | |
| 163 // to the step labeled switch direction. | |
| 164 LayoutUnit parentHeight = containingBlock()->height(); | |
| 165 if (m_cue->getWritingDirection() == TextTrackCue::Horizontal && ((step < 0 &
& top < 0) || (step > 0 && bottom > parentHeight))) | |
| 166 return true; | |
| 167 | |
| 168 // 12. Vertical: If step is negative and the left edge of the first line | |
| 169 // box in boxes is now to the left of the left edge of the video's | |
| 170 // rendering area, or if step is positive and the right edge of the | |
| 171 // first line box in boxes is now to the right of the right edge of | |
| 172 // the video's rendering area, jump to the step labeled switch direction. | |
| 173 LayoutUnit parentWidth = containingBlock()->width(); | |
| 174 if (m_cue->getWritingDirection() != TextTrackCue::Horizontal && ((step < 0 &
& left < 0) || (step > 0 && right > parentWidth))) | |
| 175 return true; | |
| 176 | |
| 177 return false; | |
| 178 } | |
| 179 | |
| 180 void RenderTextTrackCue::moveBoxesByStep(LayoutUnit step) | |
| 181 { | |
| 182 // 13. Horizontal: Move all the boxes in boxes down by the distance | |
| 183 // given by step. (If step is negative, then this will actually | |
| 184 // result in an upwards movement of the boxes in absolute terms.) | |
| 185 if (m_cue->getWritingDirection() == TextTrackCue::Horizontal) | |
| 186 setY(y() + step); | |
| 187 | |
| 188 // 13. Vertical: Move all the boxes in boxes right by the distance | |
| 189 // given by step. (If step is negative, then this will actually | |
| 190 // result in a leftwards movement of the boxes in absolute terms.) | |
| 191 else | |
| 192 setX(x() + step); | |
| 193 } | |
| 194 | |
| 195 bool RenderTextTrackCue::switchDirection(bool& switched, LayoutUnit& step) | |
| 196 { | |
| 197 // 15. Switch direction: Move all the boxes in boxes back to their | |
| 198 // default position as determined in the step above labeled default. | |
| 199 setX(m_fallbackPosition.x()); | |
| 200 setY(m_fallbackPosition.y()); | |
| 201 | |
| 202 // 16. If switched is true, jump to the step labeled done | |
| 203 // positioning below. | |
| 204 if (switched) | |
| 205 return false; | |
| 206 | |
| 207 // 17. Negate step. | |
| 208 step = -step; | |
| 209 | |
| 210 // 18. Set switched to true. | |
| 211 switched = true; | |
| 212 return true; | |
| 213 } | |
| 214 | |
| 215 void RenderTextTrackCue::repositionCueSnapToLinesSet() | |
| 216 { | |
| 217 InlineFlowBox* firstLineBox; | |
| 218 LayoutUnit step; | |
| 219 LayoutUnit position; | |
| 220 | |
| 221 if (!findFirstLineBox(firstLineBox)) | |
| 222 return; | |
| 223 | |
| 224 if (!initializeLayoutParameters(firstLineBox, step, position)) | |
| 225 return; | |
| 226 | |
| 227 bool switched; | |
| 228 placeBoxInDefaultPosition(position, switched); | |
| 229 | |
| 230 // 11. Step loop: If none of the boxes in boxes would overlap any of the box
es | |
| 231 // in output and all the boxes in output are within the video's rendering ar
ea | |
| 232 // then jump to the step labeled done positioning. | |
| 233 while (isOutside() || isOverlapping()) { | |
| 234 if (!shouldSwitchDirection(firstLineBox, step)) | |
| 235 // 13. Move all the boxes in boxes ... | |
| 236 // 14. Jump back to the step labeled step loop. | |
| 237 moveBoxesByStep(step); | |
| 238 else if (!switchDirection(switched, step)) | |
| 239 break; | |
| 240 | |
| 241 // 19. Jump back to the step labeled step loop. | |
| 242 } | |
| 243 | |
| 244 // Acommodate extra top and bottom padding, border or margin. | |
| 245 // Note: this is supported only for internal UA styling, not through the cue
selector. | |
| 246 if (hasInlineDirectionBordersPaddingOrMargin()) { | |
| 247 IntRect containerRect = containingBlock()->absoluteBoundingBoxRect(); | |
| 248 IntRect cueRect = absoluteBoundingBoxRect(); | |
| 249 | |
| 250 int topOverflow = cueRect.y() - containerRect.y(); | |
| 251 int bottomOverflow = containerRect.y() + containerRect.height() - cueRec
t.y() - cueRect.height(); | |
| 252 | |
| 253 int adjustment = 0; | |
| 254 if (topOverflow < 0) | |
| 255 adjustment = -topOverflow; | |
| 256 else if (bottomOverflow < 0) | |
| 257 adjustment = bottomOverflow; | |
| 258 | |
| 259 if (adjustment) | |
| 260 setY(y() + adjustment); | |
| 261 } | |
| 262 } | |
| 263 | |
| 264 void RenderTextTrackCue::repositionCueSnapToLinesNotSet() | |
| 265 { | |
| 266 // FIXME: Implement overlapping detection when snap-to-lines is not set. htt
p://wkb.ug/84296 | |
| 267 } | |
| 268 | |
| 269 } // namespace WebCore | |
| 270 | |
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Chromium Code Reviews
Issue 77853002:
Move VTT functionality from TextTrackCue.* to VTTCue.* (Closed)
Base URL: svn://svn.chromium.org/blink/trunk