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1 /* | 1 /* |
2 * Copyright (C) 2012 Victor Carbune (victor@rosedu.org) | 2 * Copyright (C) 2012 Victor Carbune (victor@rosedu.org) |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
11 * documentation and/or other materials provided with the distribution. | 11 * documentation and/or other materials provided with the distribution. |
12 * | 12 * |
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 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. | 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 */ | 24 */ |
25 | 25 |
26 #include "config.h" | 26 #include "config.h" |
27 #include "core/layout/LayoutVTTCue.h" | 27 #include "core/layout/LayoutVTTCue.h" |
28 | 28 |
29 #include "core/html/shadow/MediaControls.h" | 29 #include "core/html/shadow/MediaControls.h" |
30 #include "core/html/track/vtt/VTTCue.h" | |
31 #include "core/layout/LayoutInline.h" | 30 #include "core/layout/LayoutInline.h" |
32 #include "core/layout/LayoutState.h" | 31 #include "core/layout/LayoutState.h" |
33 | 32 |
34 namespace blink { | 33 namespace blink { |
35 | 34 |
36 LayoutVTTCue::LayoutVTTCue(VTTCueBox* element) | 35 LayoutVTTCue::LayoutVTTCue(ContainerNode* node, float snapToLinesPosition) |
37 : LayoutBlockFlow(element) | 36 : LayoutBlockFlow(node) |
38 , m_cue(element->getCue()) | 37 , m_snapToLinesPosition(snapToLinesPosition) |
39 { | 38 { |
40 } | 39 } |
41 | 40 |
42 class SnapToLinesLayouter { | 41 class SnapToLinesLayouter { |
43 STACK_ALLOCATED(); | 42 STACK_ALLOCATED(); |
44 public: | 43 public: |
45 SnapToLinesLayouter(LayoutVTTCue& cueBox, const IntRect& controlsRect, float
linePosition) | 44 SnapToLinesLayouter(LayoutVTTCue& cueBox, const IntRect& controlsRect) |
46 : m_cueBox(cueBox) | 45 : m_cueBox(cueBox) |
47 , m_controlsRect(controlsRect) | 46 , m_controlsRect(controlsRect) |
48 , m_linePosition(linePosition) | |
49 { | 47 { |
50 } | 48 } |
51 | 49 |
52 void layout(); | 50 void layout(); |
53 | 51 |
54 private: | 52 private: |
55 bool isOutside() const; | 53 bool isOutside() const; |
56 bool isOverlapping() const; | 54 bool isOverlapping() const; |
57 LayoutUnit computeInitialPositionAdjustment(LayoutUnit&) const; | 55 LayoutUnit computeInitialPositionAdjustment(LayoutUnit&) const; |
58 bool shouldSwitchDirection(InlineFlowBox*, LayoutUnit) const; | 56 bool shouldSwitchDirection(InlineFlowBox*, LayoutUnit) const; |
59 | 57 |
60 void moveBoxesBy(LayoutUnit distance) | 58 void moveBoxesBy(LayoutUnit distance) |
61 { | 59 { |
62 m_cueBox.setLogicalTop(m_cueBox.logicalTop() + distance); | 60 m_cueBox.setLogicalTop(m_cueBox.logicalTop() + distance); |
63 } | 61 } |
64 | 62 |
65 InlineFlowBox* findFirstLineBox() const; | 63 InlineFlowBox* findFirstLineBox() const; |
66 | 64 |
67 LayoutPoint m_specifiedPosition; | 65 LayoutPoint m_specifiedPosition; |
68 LayoutVTTCue& m_cueBox; | 66 LayoutVTTCue& m_cueBox; |
69 IntRect m_controlsRect; | 67 IntRect m_controlsRect; |
70 float m_linePosition; | |
71 }; | 68 }; |
72 | 69 |
73 InlineFlowBox* SnapToLinesLayouter::findFirstLineBox() const | 70 InlineFlowBox* SnapToLinesLayouter::findFirstLineBox() const |
74 { | 71 { |
75 if (!m_cueBox.firstChild()->isLayoutInline()) | 72 if (!m_cueBox.firstChild()->isLayoutInline()) |
76 return nullptr; | 73 return nullptr; |
77 return toLayoutInline(m_cueBox.firstChild())->firstLineBox(); | 74 return toLayoutInline(m_cueBox.firstChild())->firstLineBox(); |
78 } | 75 } |
79 | 76 |
80 LayoutUnit SnapToLinesLayouter::computeInitialPositionAdjustment(LayoutUnit& ste
p) const | 77 LayoutUnit SnapToLinesLayouter::computeInitialPositionAdjustment(LayoutUnit& ste
p) const |
81 { | 78 { |
| 79 ASSERT(std::isfinite(m_cueBox.snapToLinesPosition())); |
| 80 |
82 // 6. Let line position be the text track cue computed line position. | 81 // 6. Let line position be the text track cue computed line position. |
83 // 7. Round line position to an integer by adding 0.5 and then flooring it. | 82 // 7. Round line position to an integer by adding 0.5 and then flooring it. |
84 LayoutUnit linePosition = floorf(m_linePosition + 0.5f); | 83 LayoutUnit linePosition = floorf(m_cueBox.snapToLinesPosition() + 0.5f); |
85 | 84 |
86 WritingMode writingMode = m_cueBox.style()->writingMode(); | 85 WritingMode writingMode = m_cueBox.style()->writingMode(); |
87 // 8. Vertical Growing Left: Add one to line position then negate it. | 86 // 8. Vertical Growing Left: Add one to line position then negate it. |
88 if (writingMode == RightToLeftWritingMode) | 87 if (writingMode == RightToLeftWritingMode) |
89 linePosition = -(linePosition + 1); | 88 linePosition = -(linePosition + 1); |
90 | 89 |
91 // 9. Let position be the result of multiplying step and line position. | 90 // 9. Let position be the result of multiplying step and line position. |
92 LayoutUnit position = step * linePosition; | 91 LayoutUnit position = step * linePosition; |
93 | 92 |
94 // 10. Vertical Growing Left: Decrease position by the width of the | 93 // 10. Vertical Growing Left: Decrease position by the width of the |
(...skipping 211 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
306 if (!adjustment) | 305 if (!adjustment) |
307 return; | 306 return; |
308 | 307 |
309 setY(location().y() + adjustment); | 308 setY(location().y() + adjustment); |
310 } | 309 } |
311 | 310 |
312 void LayoutVTTCue::layout() | 311 void LayoutVTTCue::layout() |
313 { | 312 { |
314 LayoutBlockFlow::layout(); | 313 LayoutBlockFlow::layout(); |
315 | 314 |
316 // If WebVTT Regions are used, the regular WebVTT layout algorithm is no | |
317 // longer necessary, since cues having the region parameter set do not have | |
318 // any positioning parameters. Also, in this case, the regions themselves | |
319 // have positioning information. | |
320 if (!m_cue->regionId().isEmpty()) | |
321 return; | |
322 | |
323 ASSERT(firstChild()); | 315 ASSERT(firstChild()); |
324 | 316 |
325 LayoutState state(*this, locationOffset()); | 317 LayoutState state(*this, locationOffset()); |
326 | 318 |
327 // Determine the area covered by the media controls, if any. If the controls | 319 // Determine the area covered by the media controls, if any. If the controls |
328 // are present, they are the next sibling of the text track container, which | 320 // are present, they are the next sibling of the text track container, which |
329 // is our parent. (LayoutMedia ensures that the media controls are laid out | 321 // is our parent. (LayoutMedia ensures that the media controls are laid out |
330 // before text tracks, so that the layout is up-to-date here.) | 322 // before text tracks, so that the layout is up-to-date here.) |
331 ASSERT(parent()->node()->isTextTrackContainer()); | 323 ASSERT(parent()->node()->isTextTrackContainer()); |
332 IntRect controlsRect; | 324 IntRect controlsRect; |
333 if (LayoutObject* parentSibling = parent()->nextSibling()) { | 325 if (LayoutObject* parentSibling = parent()->nextSibling()) { |
334 // Only a part of the media controls is used for overlap avoidance. | 326 // Only a part of the media controls is used for overlap avoidance. |
335 MediaControls* controls = toMediaControls(parentSibling->node()); | 327 MediaControls* controls = toMediaControls(parentSibling->node()); |
336 if (LayoutObject* controlsLayout = controls->layoutObjectForTextTrackLay
out()) | 328 if (LayoutObject* controlsLayout = controls->layoutObjectForTextTrackLay
out()) |
337 controlsRect = controlsLayout->absoluteBoundingBoxRect(); | 329 controlsRect = controlsLayout->absoluteBoundingBoxRect(); |
338 } | 330 } |
339 | 331 |
340 // http://dev.w3.org/html5/webvtt/#dfn-apply-webvtt-cue-settings - step 13. | 332 // http://dev.w3.org/html5/webvtt/#dfn-apply-webvtt-cue-settings - step 13. |
341 if (m_cue->snapToLines()) { | 333 if (!std::isnan(m_snapToLinesPosition)) { |
342 SnapToLinesLayouter(*this, controlsRect, m_cue->calculateComputedLinePos
ition()).layout(); | 334 SnapToLinesLayouter(*this, controlsRect).layout(); |
343 | 335 |
344 adjustForTopAndBottomMarginBorderAndPadding(); | 336 adjustForTopAndBottomMarginBorderAndPadding(); |
345 } else { | 337 } else { |
346 repositionCueSnapToLinesNotSet(); | 338 repositionCueSnapToLinesNotSet(); |
347 } | 339 } |
348 } | 340 } |
349 | 341 |
350 } // namespace blink | 342 } // namespace blink |
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