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| author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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| committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
| commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
| tree | 10027f336435511475e392454359edea8e25895d /layout/doc/table_reflow_slides.html | |
| parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
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diff --git a/layout/doc/table_reflow_slides.html b/layout/doc/table_reflow_slides.html new file mode 100644 index 000000000..e76a10768 --- /dev/null +++ b/layout/doc/table_reflow_slides.html @@ -0,0 +1,888 @@ +<!-- This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. --> + +<!-- vim:sw=2:et:ts=2:tw=72: +--> +<!DOCTYPE html public "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/html4/loose.dtd"> +<html lang="en-US"> +<head> + <title>Table Reflow Tech Talk, 2002-08-05</title> + <style type="text/css"> + + html, body { + height: 100%; + overflow: visible; + } + + body { + font-size: 1.4em; + font-family: Verdana, Arial, Helvetica, sans-serif; + font-weight: bold; + background: white; + color: black; + } + + h1, h2, p { + margin: 0; + } + + h1 { + font: inherit; + font-size: 1.5em; + /* text-align: center; */ + margin-bottom: 0.8em; + border-bottom: 0.1em solid #006; + color: #006; + } + + h2 { + font: inherit; + font-size: 1.2em; + text-align: left; + margin: 0.15em 0; + } + + ul { + padding: 0 0 0 1.4em; + margin: 0; + } + + li { margin: 0; + margin-top: 0.5em; + padding: 0; + font-size: 1.0em;} + + div.slide { + position: relative; + min-height: 100%; + } + + div.nav { + /* + position: absolute; + top: 4px; + right: 4px; + */ + float: right; + margin: 4px; + } + + div.nav :link, div.nav :visited, div.nav span { + text-decoration: none; + background: #006; + color: white; + padding: 0 0.4em 0.2em 0.4em; + line-height: 1.4em; + } + + div.nav :link:hover, div.nav :visited:hover { + background: #00f; + } + + table { + margin: auto; + } + + table.box { + border-collapse: collapse; + border: 2px solid black; + box-sizing: border-box; + width:98%; + height:96%; + } + + row { + border: 2px solid black; + } + row.title { + border: hidden; + } + + table td { + /*text-align: center;*/ + empty-cells: hide; + } + + table td.box { + height:100%; + border: 2px solid black; + } + + table td.title { + border-top: hidden; + border-right: hidden; + border-left: hidden; + font-size: .5em; + } + + table td.title2 { + border-bottom: hidden; + border-right: hidden; + border-left: hidden; + font-size: .5em; + } + + table.tree tr:not(.arrows) td { + font-family: monospace; + border: 0.1em solid; + font-size: .7em; + text-align:center; + } + + table td.left-arrow { + text-align: right; + } + + table td.right-arrow { + text-align: left; + } + + table td.center-arrow { + text-align: center; + } + + span.html { + color:purple; + } + + table td.space { + width: 5%; + } + + table td.frame { + width: 22%; + } + + span.comment { + color: red; + } + + </style> +</head> +<body> + +<div class="slide" id="s0"> + <div class="nav"> + <a href="#s28"><</a> + <a href="#s1">></a> + </div> + <table style="margin: auto"><tr><td> + <center> + <h1>Table Reflow Internals<br>Tech Talk</h1> + <p>Aug 5, 2002</p> + <p style="margin-top: 0.5em">Chris Karnaze</a></p> + </center> + </td></tr></table> + +</div> + +<div class="slide" id="s1"> + <div class="nav"> + <a href="#s0"><</a> + <a href="#s2">></a> + </div> + <h1>Overview</h1> + <ul> + <li>Review of reflow</li> + <li>Table frames</li> + <li>Table reflow</li> + <li>Intro to paginated reflow</li> + <li>Table paginated reflow</li> + </ul> +</div> + +<div class="slide" id="s2"> + <div class="nav"> + <a href="#s1"><</a> + <a href="#s3">></a> + </div> + <h1>Review of Reflow</h1> + <ul> + <li>Reflow process starts when + <ul> + <li>An html document starts loading (the frame tree contains only viewport, scroll(s), canvas, html, body).</li> + <li>The initial chunk of an xml doc is loaded.</li> + <li>The initial chunk of an html doc (or a subsequent chunk of an xml doc) is loaded. The container posts a + dirty reflow command with itself as the target. </li> + <li>Content is inserted, appended, or deleted through the DOM. The container posts a dirty reflow command + with itself as the target.</li> + <li>Style changes through the DOM - javascript, browser change font (CTRL+/-), a preference changes, etc.</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s3"> + <div class="nav"> + <a href="#s2"><</a> + <a href="#s4">></a> + </div> + <h1>Review of Reflow</h1> + <ul> + <li>Reflow starts with pres shell + <ul> + <li>Which reflows the reflow root (usually the view port frame),</li> + <li>Which reflows it children, etc.</li> + </ul> + </li> + <li>Ususally it starts when the pres shell processes its queue of reflow commands.</li> + <li>The reflower + <ul> + <li>Positions reflowee (if it can) before actually reflowing in case views are involved + (e.g. absolutely positioned elements) </li> + <li>Reflows reflowee and passes a reflow state (in) and a reflow metrics (in/out)</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s4"> + <div class="nav"> + <a href="#s3"><</a> + <a href="#s5">></a> + </div> + <h1>Review of Reflow</h1> + <ul> + <li>The reflow state: + <ul> + <li>Is a node in a tree structurally equivalent to the frame tree of reflow participants</li> + <li>contains: + <ul> + <li>reflow type,</li> + <li>avail size,</li> + <li>various computed values,</li> + <li>resolved style structs</li> + <li>possible request for preferred size and more.</li> + </ul> + </li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s5"> + <div class="nav"> + <a href="#s4"><</a> + <a href="#s6">></a> + </div> + <h1>Review of Reflow</h1> + <ul> + </li> + <li>the reflow metrics contains: + <ul class=nested> + <li>max element size (if requested) - the minimum size it can be</li> + <li>preferred size (if requested) - the size it would like to be given no size constraints.</li> + <li>desired size - the size it would like to be given the avail size. This + is equivalent to preferred size if the avail size is not constrained.</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s6"> + <div class="nav"> + <a href="#s5"><</a> + <a href="#s7">></a> + </div> + <h1>Review of Reflow</h1> + <ul> + <li>The reflowee sets various sizes in the reflow metrics after (possibly) reflowing some or all of its children + which reflows it children, etc.</li> + <li>The reflowee returns a reflow status which indicates + <ul class=nested> + <li>if it is complete, and thus not have to continue (split)</li> + <li>breaking status (in the case of some inline frames)</li> + <li>if there is truncation (it can't fit in the space and can't split). This is just a convience mechanism.</li> + </ul> + </li> + +</div> + +<div class="slide" id="s7"> + <div class="nav"> + <a href="#s6"><</a> + <a href="#s8">></a> + </div> + + <h1>Kinds of reflows</h1> + <ul> + <li>Initial - reflowee's first reflow must be of this type (reflower's responsibility).</li> + <li>Resize - reflowee gets a change in available space only. Similar to initial, except it can reoccur.</li> + <li>Incremental - has a reflow path (tree) where each node has a command with a target frame, <br>reflow command types are:</li> + <ul class=nested> + <li>dirty - something changed inside a target (e.g. it gains, loses children)</li> + <li>style changed - a target changed stylisticly (recall, size is a style property)</li> + <li>content changed - a target's content changed (e.g. a text run)</li> + <li>user defined - currently only used for fixed positioned frames </li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s8"> + <div class="nav"> + <a href="#s7"><</a> + <a href="#s9">></a> + </div> + <h1>Kinds of reflows</h1> + <ul> + <li>Incremental reflow (continued) + <ul class=nested> + <li>reflower not allowed to change available size of reflowee</li> + <li>reflow commands get coalesced to streamline processing</li> + </ul> + </li> + <li>Style change + <ul class=nested> + <li>a target changed stylistic if there is a target, otherwise every frame may need to respond</li> + <li>parent of target usually turns it into an incremental reflow with a style changed command type</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s9"> + <div class="nav"> + <a href="#s8"><</a> + <a href="#s10">></a> + </div> + <h1>Table Frames</h1> + <BR> + <table class="tree" width=90%> + <tr><td class=frame><td class=space style="width:2%"><td class=frame><td class=space style="width:2%"> + <td class=frame><td class=space><td class=frame></tr> + <tr><td><td><td class=frame><td> + <td>nsTableOuter Frame<td><td></tr> + <tr class="arrows"><td><td><td><td class=left-arrow>↙<td><td class=right-arrow>↘</tr> + <tr><td><td><td>nsTable<BR>Frame<td><td><td><td>nsTableCaption<BR>Frame</tr> + <tr class="arrows"><td><td class=left-arrow>↙<td><td class=right-arrow>↘<td><td><td class=center-arrow>↓</tr> + <tr><td>nsTableCol<BR>GroupFrame<td><td><TD><td>nsTableRow<BR>GroupFrame<td><td>nsBlockFrame</tr> + <tr class="arrows"><td class=center-arrow>↓<td><td><td><td class=center-arrow>↓</tr> + <tr><td>nsTableCol<BR>Frame<td><TD><TD><td>nsTableRow<BR>Frame</tr> + <tr class="arrows"><td><td><td><td><td class=center-arrow>↓</tr> + <tr><td><td><td><TD><td>nsTableCell<BR>Frame</tr> + <tr class="arrows"><td><td><td><td><td class=center-arrow>↓</tr> + <tr><td><td><td><TD><td>nsBlock<BR>Frame</tr> + </table> +</div> + +<div class="slide" id="s10"> + <div class="nav"> + <a href="#s9"><</a> + <a href="#s11">></a> + </div> + <h1>Table Reflow</h1> + <ul> + <li>table wrapper reflows table and caption (if present)</li> + <li>Table reflows row groups in multiple passes</li> + <ul class=nested> + <li>Pass 1 - unconstrained width, height and requests max elem width.</li> + <li>The table figures out the column widths (balances) given the style width constraints + on the table, col groups, cols, cells the preferred and max element sizes of the cells + (from the pass 1 reflow), and considers colspans</li> + <li>Pass 2 - cell widths are constrained by the column widths (heights are only + constrained in paginated mode).</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s11"> + <div class="nav"> + <a href="#s10"><</a> + <a href="#s12">></a> + </div> + <h1>Table Reflow</h1> + <ul> + <li>Table reflows row groups (continued)</li> + <ul class=nested> + <li>The row group figures out the row heights given the its style height constraints + its rows and cells and the actual heights of its rows and cells from the pass 2 reflow</li> + <li>If the table has a style height, it allocates extra height to its row groups, rows and cells.</li> + </ul> + </li> + <li>In each pass, row groups reflow rows which reflow cells which reflow cell blocks</li> + </ul> +</div> + +<div class="slide" id="s12"> + <div class="nav"> + <a href="#s11"><</a> + <a href="#s13">></a> + </div> + <h1>Table Reflow Example</h1> + <table width=100%> + <tr> + <td width=100%> + <pre style="font-size:.6em;"> +tblW 030176CC r=0 a=8940,UC c=0,0 cnt=429 + tbl 030178C4 r=0 a=8940,UC c=4470,UC cnt=430 + rowG 03017A7C r=0 a=UC,UC c=UC,UC cnt=431 + row 03017C08 r=0 a=UC,UC c=UC,UC cnt=432 + cell 03017DA8 r=0 a=UC,UC c=UC,UC cnt=433 + block 03017E08 r=0 a=UC,UC c=UC,UC cnt=434 + block 03017E08 d=870,300 me=480 + cell 03017DA8 d=930,360 me=540 + cell 0301A8CC r=0 a=UC,UC c=UC,UC cnt=436 + block 0301A92C r=0 a=UC,UC c=UC,UC cnt=437 + block 0301A92C d=1335,300 me=465 + cell 0301A8CC d=1395,360 me=525 + row 03017C08 d=UC,360 + rowG 03017A7C d=UC,360 + rowG 03017A7C r=2 a=4470,UC c=4470,UC cnt=442 + row 03017C08 r=2 a=4470,UC c=4470,UC cnt=443 + cell 03017DA8 r=2 a=1755,UC c=1695,UC cnt=444 + block 03017E08 r=2 a=1695,UC c=1695,UC cnt=445 + block 03017E08 d=1695,300 + cell 03017DA8 d=1755,360 + cell 0301A8CC r=2 a=2625,UC c=2565,UC cnt=446 + block 0301A92C r=2 a=2565,UC c=2565,UC cnt=447 + block 0301A92C d=2565,300 + cell 0301A8CC d=2625,360 + row 03017C08 d=4470,360 + rowG 03017A7C d=4470,360 + tbl 030178C4 d=4500,450 + tblW 030176CC d=4500,450 + + <a href="frame_reflow_debug.html">frame reflow debugging</a> gives instructions + for turning this on. + </pre> + </td> + <td> + <pre style="font-size:.7em;"> +<<span class=html>table</span> width=300> + <<span class=html>tr</span>> + <<span class=html>td</span>>foo<<span class=html>/td</span>> + <<span class=html>td</span>>bar zap<<span class=html>/td</span>> + <<span class=html>/tr</span>> +<<span class=html>/table</span>> + </pre> + <BR> + <BR> + <pre style="font-size:.7em;"> +Key: + + r = reflow reason, + 0 (initial), + 2 (resize) + a = avail w, h + c = computed w, h + d = desired w, h + me = max elem w + <pre> + </td> + </tr> + </table> +</div> + +<div class="slide" id="s13"> + <div class="nav"> + <a href="#s12"><</a> + <a href="#s14">></a> + </div> + <h1>Table reflow optimizations</h1> + <ul> + <li>If the table is already balanced, pass 1 constrains the width (like a normal pass 2) based on the current + column widths. The pass 2 will get skipped if the table doesn't need to rebalance. <!--<span class="comment">please clarify when can this happen</span>--></li> + <li>Nested table reflowed with an unconstrained width (i.e. an ancestor is doing a pass 1 reflow) + will only do a pass 1 reflow on its children</li> + <li>table wrapper caches last avail width and avoids reflowing children if resize reflow is the same as previous</li> + <li>Table caches max element, preferred widths in case they are requested and it isn't rebalanced</li> + <li>Cell caches prior avail width. if this doesn't change, the row may not have to reflow the cell</li> + </ul> + +</div> + +<div class="slide" id="s14"> + <div class="nav"> + <a href="#s13"><</a> + <a href="#s15">></a> + </div> + <h1>Table incremental reflow</h1> + <ul> + <li>table wrapper is a target when a caption is added or removed (dirty) or the table or caption margin + changes (style changed).</li> + <li>Caption is a target when it changes stylistically (style changed).</li> + <li>Table, row group, row, col group, col is a target when a child is added or removed (dirty) or it changes + stylistically (style changed). <!--<span class="comment">please show how the column style change is propagated + into the cell reflows as the cells are reflowed by their parent rows and not cols</span>--></li> + <li>In the dirty cases, a target posted the reflow command in AppendFrames, InsertFrames, or DeleteFrame.</li> + </ul> +</div> + +<div class="slide" id="s15"> + <div class="nav"> + <a href="#s14"><</a> + <a href="#s16">></a> + </div> + <h1>Table incremental reflow</h1> + <ul> + <li>In the style change cases where a target is between the table and the cell, the table is told to rebalance.</li> + <li>When a target is the cell or below and the cell changes size, the row tells the table so it can decide if + it needs to rebalance</li> + <li>When a target is inside the cell's block, the cell + requests max element, preferred sizes of its block in case they change</li> + <li>After the table reflows the row group(s) containing the targets, if it rebalances, it then does a pass 2 reflow.</li> + </ul> +</div> + +<div class="slide" id="s16"> + <div class="nav"> + <a href="#s15"><</a> + <a href="#s17">></a> + </div> + <h1>Special height reflow</h1> + <ul> + <li>When there is a % height frame inside a cell without a computed height</li> + <ul class=nested> + <li>the frame will never get a chance to size based on the final cell height</li> + <li>in paginated mode when there is a height on the table, the table doesn't allocate + extra height to rows until after it does a pass 2 reflow and then it is too late</li> + </ul> + </li> + <li>This can be fixed by doing a special 3rd pass reflow</li> + </ul> + </div> +</div> + +<div class="slide" id="s17"> + <div class="nav"> + <a href="#s16"><</a> + <a href="#s18">></a> + </div> + <h1>Special Reflow Example</h1> + <table width=100% style="text-align:left;"> + <tr> + <td> + <pre style="font-size:.7em; text-align:left;"> +<<span class=html>table</span> border=2 width=300> + <<span class=html>tr</span>> + <<span class=html>td</span>> + This cell's width is + constrained by the + table and image widths. + Its exact height is + hard to determine. + <<span class=html>/td</span>> + <<span class=html>td</span>> + <<span class=html>img</span> src=raptor.jpg + width=200 height=100%> + <<span class=html>/td</span>> + <<span class=html>/tr</span>> +<<span class=html>/table</span>> + </pre> + </td> + <td> + <table border=2 width=300> + <tr> + <td style="font-size:.7em;">This cell's width is constrained + by the table and image widths. <BR><BR>Its height + is hard to determine.<BR><BR> The image needs to be as high as the cell. + <td> + <!-- need ?raw=1 for lxr to cough up the image data, not a pretty page --> + <img src="raptor.jpg?raw=1" + width=200 height=100%> + </td> + </tr> + </table> + + </tr> + </table> +</div> + + +<div class="slide" id="s18"> + <div class="nav"> + <a href="#s17"><</a> + <a href="#s19">></a> + </div> + <h1>Special height reflow</h1> + <ul> + <li>The reflow state holds an observer and initiator</li> + <li>Observer</li> + <ul class=nested> + <li>is the table cell used as the height basis</li> + <li>set by frame without computed height in DidReflow</li> + <li>gives its block a computed height during 3rd pass</li> + <li>doesn't change height during 3rd pass</li> + </ul> + </li> + <li>Initiator</li> + <ul class=nested> + <li>is the table containing the observer</li> + <li>starts the 3rd pass reflow and sets a bit in the reflow state</li> + <li>gives its block a computed height during 3rd pass</li> + <li>could also be inside a cell which is an observer</li> + </ul> + </li> +</div> + +<div class="slide" id="s19"> + <div class="nav"> + <a href="#s18"><</a> + <a href="#s20">></a> + </div> + <h1>Special height reflow</h1> + <ul> + <li>Optimizations</li> + <ul class=nested> + <li>only frames needing 3rd pass actually get it</li> + <li>frames gettting a 3rd pass only get it once</li> + </ul> + </li> +</div> + +<div class="slide" id="s20"> + <div class="nav"> + <a href="#s19"><</a> + <a href="#s21">></a> + </div> + <h1>Intro to paginated reflow</h1> + <ul> + <li>When a reflowee's available height is constrained, it may not fit and need to either + split/continue on the next page, or start on the next page.</li> + <ul class=nested> + <li>If it can continue, it returns an incomplete status.</li> + <li>If it can't continue it returns a complete status.</li> + </ul> + </li> + <li>A continuation may also need to be continued</li> + <li>Continuations are linked together by prevInFlow and nextInFlow pointers </li> + </ul> +</div> + +<div class="slide" id="s21"> + <div class="nav"> + <a href="#s20"><</a> + <a href="#s22">></a> + </div> + <h1>Pagination Illustration</h1> + <table class=box style="height:500px"> + <tr><td class="title">nsSimplePageSequence</td></tr> + <tr> + <td class=box> + <table class=box style="height:40%;"> + <tr><td class=title>nsPageFrame</td></tr> + <tr> + <td class=box> + <table class=box style="height:100%;"> + <tr><td class=title>nsPageContentFrame</td></tr> + <tr> + <td class=box style="border-bottom: hidden"> + <table class=box style="height:100%; border-bottom:hidden"> + <tr><td class=title>areaFrame (html)</td></tr> + <tr> + <td class=box> + <table class=box style="height:100%; border-bottom:hidden"> + <tr><td class=title>blockFrame (body)</td></tr> + <tr> + <td class=box> + <table class=box style="height:100%; border-bottom:hidden"> + <tr><td class=title>nsTableWrapperFrame</td></tr> + <tr> + <td class=box></td> + </tr> + </table> + </td> + </tr> + </table> + </td> + </tr> + </table> + </tr> + </table> + </td> + </tr> + </table> + <BR> + <table class=box style="height:40%;"> + <tr> + <td class=box> + <table class=box style="height:100%;"> + <tr> + <td class=box style="border-top: hidden"> + <table class=box style="height:100%; border-top:hidden"> + <tr> + <td class=box> + <table class=box style="height:100%; border-top:hidden"> + <tr> + <td class=box> + <table class=box style="height:100%; border-top:hidden"> + <tr> + <td class=box></td> + </tr> + <tr><td class=title2>nsTableWrapperFrame</td></tr> + </table> + </td> + </tr> + <tr><td class=title2>blockFrame (body)</td></tr> + </table> + </td> + </tr> + <tr><td class=title2>areaFrame (html)</td></tr> + </table> + </tr> + <tr><td class=title2>nsPageContentFrame continued</td></tr> + </table> + </td> + </tr> + <tr><td class=title2>nsPageFrame continued</td></tr> + </table> + </td> + </tr> + </table> +</div> + +<div class="slide" id="s22"> + <div class="nav"> + <a href="#s21"><</a> + <a href="#s23">></a> + </div> + <h1>Intro to paginated reflow</h1> + <ul> + <li>The page sequence starts with one page and reflows it. If the page is incomplete then the page sequence + creates a continuation for the page and sets it as the page's next sibling (it is also the page's + nextInFlow).</li> + <li>The page was incomplete because the page content was incomplete because the doc root was incomplete</li> + <li>The doc root was incomplete because it contained lines that didn't fit (or if it was mapped to a table, + because the table didn't fit) becacause a line contained something that didn't fit, etc.</li> + </ul> +</div> + +<div class="slide" id="s23"> + <div class="nav"> + <a href="#s22"><</a> + <a href="#s24">></a> + </div> + <h1>Intro to paginated reflow</h1> + <ul> + <li>If the reflowee is incomplete, the reflower has the responsiblity to: + <ul> + <li>Create a continuation for the reflowee</li> + <li>Ensure that the continuation gets put in the frame hierarchy at the right place + and gets reflowed at the right time.</li> + <li>Typically, a reflower accomplishes this by putting the continuation (c) on an overflow + list which the reflower owns. When the reflower's continuation gets reflowed, it takes c + and its siblings as children and reflows them.</li> + </ul> + </li> + <li>If the reflowee is complete, truncated (it didn't fit), not at the top of page, + the reflower should put the reflowee on its overflow list and return an incomplete status.</li> + </ul> +</div> + +<div class="slide" id="s24"> + <div class="nav"> + <a href="#s23"><</a> + <a href="#s25">></a> + </div> + <h1>Intro to paginated reflow</h1> + <ul> + <li>Special assumptions + <ul> + <li>There are only initial and (possibly) resize reflows. Incremental + and style change reflows are not allowed.</li> + <li>Multiple resize reflows may be necessary (e.g. a child is truncated and gets reflowed on a + subsequent page) but they should not change the available width from the last time.</li> + <li>Multiple resize reflows may require special handling if a frame split previously. It may need + to "pull up" children from a continuation.</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s25"> + <div class="nav"> + <a href="#s24"><</a> + <a href="#s26">></a> + </div> + <h1>Table paginated reflow</h1> + <ul> + <li>The block containing the table wrapper reflows it. If it is incomplete, the block will + <ul> + <li>create a continuation for the table wrapper (which also creates a continuation for the table).</li> + <li>put the continuation on a new line and place that line on its overflow lines property.</li> + </ul> + </li> + <li>The table wrapper reflows the table and just returns the status of the table.</li> + <li>The table does a pass 1 reflow and balances. If it is incomplete,</li> + <ul> + <li>it will become the first-in-flow</li> + <li>it will be the only frame among its continuations to ever balance or calc the cell map, and it only + does this once</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s26"> + <div class="nav"> + <a href="#s25"><</a> + <a href="#s27">></a> + </div> + <h1>Table paginated reflow</h1> + <ul> + <li>The table does a pass 2 reflow constraining both avail heights and widths. If a row group is incomplete, the table + <ul> + <li>creates a continuation for the row group</li> + <li>puts the continuation in its overflow frames property</li> + </ul> + </li> + <li>What follows only applies during the pass 2 reflow.</li> + <li>The row group</li> + <ul> + <li>reflows all of its rows with unconstrained heights and calculates the row heights,</li> + <li>figures out which row falls on a page boundary and reflows it with a constrained height. If there + will be a pass 3 reflow then this should (bug) happen at that time instead.</li> + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s27"> + <div class="nav"> + <a href="#s26"><</a> + <a href="#s28">></a> + </div> + <h1>Table paginated reflow</h1> + <ul> + <li>The row group (continued)</li> + <ul> + <li>creates a continuation for the incomplete row (which also creates continuations for all of its cells + and all of the cell blocks)</li> + <li>puts the continuation in its overflow frames property. If the row was truncated and not top of page, + the row is put in the overflow frames property. + </ul> + </li> + </ul> +</div> + +<div class="slide" id="s28"> + <div class="nav"> + <a href="#s27"><</a> + <a href="#s0">></a> + </div> + <h1>Table paginated reflow</h1> + <ul> + <li>The row and cells (getting the constrained height reflow) just reflow their children with a constrained height. + They don't need an overflow list for continued children because the continuations were created when the + row group created the row's continutation.</li> + <li>A cell is incomplete because its block is incomplete. The block uses the overflow lines mechanism + (mentioned above) for its continued children</li> + </li> + <li>There are two splitting scenarios for a table + <ul> + <li>An incomplete cells block causes the cell, row, row group, table, table wrapper to + be incomplete</li> + <li>A truncated row or a row that started too far down the page causes the row group, + table, table wrapper to be incomplete.</li> + </ul> + </li> + </ul> +</div> + + +</body> +</html> |