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[css-layout-api] Add images of possible constraint spaces.
1 parent 2af5b05 commit 5189922

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+214
-32
lines changed

‎css-layout-api/Overview.bs

+52-32
Original file line numberDiff line numberDiff line change
@@ -44,13 +44,10 @@ Layout Boxes {#layout-boxes}
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<pre class='idl'>
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interface Box {
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readonly attribute ComputedStylePropertyMapReadOnly styleMap;
47-
FragmentRequestToken doLayout(ConstraintSpace space, ChildBreakToken breakToken);
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FragmentRequestToken doLayout(DerivedConstraintSpace space, ChildBreakToken breakToken);
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};
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</pre>
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51-
Issue(w3c/css-houdini-drafts#254): We may want a different name for the {{Box}} concept. In this
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context box has no layout information only style.
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A {{Box}} represents a CSS generated <a>box</a> before any layout has occurred. (The box will have a
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computed value of 'display' that is not ''none''). The {{Box}} does not contain any layout
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information itself (like inline or block size) but can be used to generate {{Fragment}}s which do
@@ -182,10 +179,10 @@ registerLayout('block-like', class {
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The {{Fragment}}'s {{Fragment/breakToken}} specifies where the {{Box}} last fragmented. If the
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{{Fragment/breakToken}} is null the {{Box}} cannot produce any more {{Fragment}}s. The
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{{Fragment/breakToken}} can be passed to the <<doLayout()>> function to produce the next
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{{Fragment/breakToken}} can be passed to the {{Box/doLayout()}} function to produce the next
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{{Fragment}} for a particular {{Box}}. The {{Fragment/breakToken}} cannot be changed. If the
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<a>current layout</a> requires a different {{Fragment/breakToken}} the author must perform
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<<doLayout()>> again with different arguments.
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{{Box/doLayout()}} again with different arguments.
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The {{Fragment}}'s {{Fragment/dominantBaseline}}, {{Fragment/alphabeticBaseline}}, and
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{{Fragment/centerBaseline}} attributes specify where all the baselines for the {{Fragment}} are
@@ -212,10 +209,10 @@ interface ConstraintSpace {
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readonly attribute double inlinePercentResolutionSize;
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readonly attribute double blockPercentResolutionSize;
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readonly attribute double? inlineScrollTriggerOffset;
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readonly attribute double? blockScrollTriggerOffset;
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readonly attribute boolean inlineScrollTrigger;
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readonly attribute boolean blockScrollTrigger;
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readonly attribute double? blockFragmentationOffset;
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readonly attribute boolean blockFragmentation;
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readonly attribute BlockFragmentationType blockFragmentationType;
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};
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@@ -229,10 +226,10 @@ dictionary ConstraintSpaceOptions {
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double inlinePercentResolutionSize = null;
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double blockPercentResolutionSize = null;
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232-
double inlineScrollTriggerOffset = null;
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double blockScrollTriggerOffset = null;
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boolean inlineScrollTrigger = false;
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boolean blockScrollTrigger = false;
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double blockFragmentationOffset = null;
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double blockFragmentation = false;
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BlockFragmentationType blockFragmentationType = "none";
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};
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@@ -313,11 +310,11 @@ The {{ConstraintSpace}} has {{ConstraintSpace/inlinePercentResolutionSize}} and
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{{ConstraintSpace/blockPercentResolutionSize}} attributes. These represent the size that a layout
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percentages should be resolved against while performing layout.
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The {{ConstraintSpace}} has {{ConstraintSpace/inlineScrollTriggerOffset}} and
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{{ConstraintSpace/blockScrollTriggerOffset}} attributes. The <a>current layout</a> can use this
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The {{ConstraintSpace}} has {{ConstraintSpace/inlineScrollTrigger}} and
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{{ConstraintSpace/blockScrollTrigger}} attributes. The <a>current layout</a> can use this
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information to early opt-out of a layout if it knows it will require additional space for a scroll
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bar in that direction. If either the {{ConstraintSpace/inlineScrollTriggerOffset}} or
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{{ConstraintSpace/blockScrollTriggerOffset}} attributes are null the <a>current layout</a> can
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bar in that direction. If either the {{ConstraintSpace/inlineScrollTrigger}} or
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{{ConstraintSpace/blockScrollTrigger}} attributes are null the <a>current layout</a> can
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assume it does not need to report to the parent layout that it will require a scroll bar in that
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direction.
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@@ -343,26 +340,49 @@ provided to a <a>current layout</a>.
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<td>
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<pre>
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ConstraintSpace {
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inlineSize = 100,
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blockSize = 100,
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blockScrollTriggerOffset = 100
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inlineSize = 120
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blockSize = 120
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}
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</pre>
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</td>
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<td>
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<pre>
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ConstraintSpace {
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inlineSize = 100,
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blockSize = 100,
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blockScrollTriggerOffset = 100
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inlineSize = 120
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blockSize = 100
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blockScrollTrigger = true
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}
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</pre>
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</td>
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</tr>
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<tr>
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<td><img style="height: 50%; text-align: center;" src="images/constraint_space_1.png"></img></td>
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<td><img style="height: 50%; text-align: center;" src="images/constraint_space_2.png"></img></td>
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</tr>
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<tr>
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<td>
364-
TODO add image.
364+
<pre>
365+
ConstraintSpace {
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inlineSize = 140
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blockSize = 100
368+
inlineScrollTrigger = true
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blockScrollTrigger = true
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}
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</pre>
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</td>
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<td>
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<pre>
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ConstraintSpace {
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inlineSize = 140
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blockSize = 100
378+
blockFragmentation = true
379+
}
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</pre>
381+
</td>
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</tr>
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<tr>
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<td><img style="height: 50%; text-align: center;" src="images/constraint_space_3.png"></img></td>
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<td><img style="height: 50%; text-align: center;" src="images/constraint_space_4.png"></img></td>
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</tr>
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</tbody>
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</table>
@@ -391,8 +411,7 @@ registerLayout('block-like-with-scroll', class {
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392412
// Early opt-out of layout algorithm if we triggered a scroll in the
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// block direction.
394-
if (space.blockScrollTriggerOffset != null &&
395-
space.blockScrollTriggerOffset < blockOffset) {
414+
if (space.blockScrollTrigger && space.blockSize < blockOffset) {
396415
return {blockScrollTriggered: true};
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}
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}
@@ -410,9 +429,9 @@ registerLayout('block-like-with-scroll', class {
410429
</pre>
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</div>
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413-
The {{ConstraintSpace}} has {{ConstraintSpace/blockFragmentationOffset}} and
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The {{ConstraintSpace}} has {{ConstraintSpace/blockFragmentation}} and
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{{ConstraintSpace/blockFragmentationType}} attributes. The <a>current layout</a> should produce a
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{{Fragment}} which fragments at this offset if possible.
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{{Fragment}} which fragments at the {{ConstraintSpace/blockSize}} if possible.
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The <a>current layout</a> may choose not to fragment a child {{Box}} based on the
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{{ConstraintSpace/blockFragmentationType}} if the child has a property like ''break-inside:
@@ -426,15 +445,16 @@ partial interface ConstraintSpace {
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void addExclusion(Exclusion exclusion, optional ExclusionOptions options);
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sequence&lt;Exclusion> getExclusions(optional ExclusionOptions options);
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Exclusion getLastExclusion(optional ExclusionOptions options);
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};
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enum ExclusionTag { "fragment", "exclusion", "float" };
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enum ExclusionTag { "fragment", "exclusion", "float-left", "float-right" };
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enum ExclusionType { "none", "inline-flow", "inline-start", "inline-end", "inline-both" };
452+
enum ExclusionBox { "none", "border", "margin" };
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435454
dictionary ExclusionOptions {
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ExclusionTag tag = "fragment";
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ExclusionType type = "none"; // default to "inline-flow" instead?
457+
ExclusionBox box = "none"; // TODO needed?
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};
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440460
interface Exclusion {
@@ -562,14 +582,14 @@ dictionary BreakTokenOptions {
562582
Object data = null;
563583
};
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565-
enum BreakType { "none", "line", "column", "page", "region" };
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enum BreakType { "none", "inline", "inline-hyphen", "column", "page", "region" };
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</pre>
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568588
Issue(w3c/css-houdini-drafts#258): What type of {{BreakType}}s are needed?
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570590
A {{Box}} can produce multiple {{Fragment}}s. A {{Box}} may fragment in the block direction if a
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{{ConstraintSpace/blockFragmentationOffset}} is present in the {{ConstraintSpace}}. It may fragment
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in the inline direction if it is an inline layout.
591+
{{ConstraintSpace/blockFragmentation}} is true. It may fragment in the inline direction if it is an
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inline layout.
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574594
A subsequent {{Fragment}} is produced by using the previous {{Fragment}}'s {{Fragment/breakToken}}.
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This tells the <a>child layout</a> to produce a {{Fragment}} starting at the point encoded in the

‎css-layout-api/images/constraint_space_1.html

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@@ -0,0 +1,38 @@
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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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body {
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--width: 120px;
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--height: 120px;
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border: solid 1px;
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height: calc(var(--height) + 40px);
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width: calc(var(--width) + 40px);
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position: absolute;
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}
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div {
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border: 2px solid #2196F3;
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height: var(--height);
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width: var(--width);
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margin: 20px;
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box-sizing: border-box;
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}
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span {
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position: absolute;
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top: 0;
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font-family: sans-serif;
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font-size: 10px;
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background-color: white;
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padding: 2px;
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}
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</style>
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</head>
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<body>
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<div></div>
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<span style="translate: 67px 13px;">120px</span>
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<span style="translate: 6px 72px;">120px</span>
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</body>
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</html>

‎css-layout-api/images/constraint_space_1.png

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‎css-layout-api/images/constraint_space_2.html

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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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body {
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--width: 120px;
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--height: 100px;
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border: solid 1px;
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height: calc(var(--height) + 40px);
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width: calc(var(--width) + 40px);
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position: absolute;
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}
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div {
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border: 2px solid #2196F3;
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height: var(--height);
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width: var(--width);
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margin: 20px;
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box-sizing: border-box;
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border-bottom-style: dashed;
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}
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span {
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position: absolute;
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top: 0;
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font-family: sans-serif;
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font-size: 10px;
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background-color: white;
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padding: 2px;
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}
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</style>
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</head>
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<body>
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<div></div>
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<span style="translate: 67px 13px;">120px</span>
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<span style="translate: 6px 62px;">100px</span>
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<span style="translate: 53px 102px;">scrollTrigger</span>
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</body>
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</html>

‎css-layout-api/images/constraint_space_2.png

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‎css-layout-api/images/constraint_space_3.html

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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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body {
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--width: 120px;
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--height: 100px;
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border: solid 1px;
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height: calc(var(--height) + 40px);
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width: calc(var(--width) + 40px);
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position: absolute;
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}
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div {
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border: 2px solid #2196F3;
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border-bottom-style: dashed;
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height: var(--height);
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width: var(--width);
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margin: 20px;
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box-sizing: border-box;
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border-right-style: dashed;
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}
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span {
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position: absolute;
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top: 0;
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font-family: sans-serif;
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font-size: 10px;
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background-color: white;
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padding: 2px;
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}
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</style>
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</head>
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<body>
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<div style="
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"></div>
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<span style="translate: 67px 13px;">120px</span>
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<span style="translate: 6px 62px;">100px</span>
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<span style="translate: 54px 102px;">scrollTrigger</span>
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<span style="translate: 78px 62px;">scrollTrigger</span>
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</body>
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</html>

‎css-layout-api/images/constraint_space_3.png

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‎css-layout-api/images/constraint_space_4.html

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<!DOCTYPE html>
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<html>
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<head>
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<style type="text/css">
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body {
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--width: 140px;
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--height: 100px;
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border: solid 1px;
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height: calc(var(--height) + 40px);
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width: calc(var(--width) + 40px);
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position: absolute;
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}
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div {
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border: 2px solid #2196F3;
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border-bottom-style: dotted;
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height: var(--height);
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width: var(--width);
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margin: 20px;
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box-sizing: border-box;
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}
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span {
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position: absolute;
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top: 0;
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font-family: sans-serif;
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font-size: 10px;
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background-color: white;
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padding: 2px;
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}
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</style>
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</head>
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<body>
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<div style="
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"></div>
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<span style="translate: 75px 13px;">140px</span>
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<span style="translate: 6px 62px;">100px</span>
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<span style="translate: 59px 102px;">fragmentation</span>
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</body>
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</html>

‎css-layout-api/images/constraint_space_4.png

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