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https://issues.apache.org/jira/browse/FOP-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nico Kutscherauer updated FOP-3167:
-----------------------------------
Attachment: colspan-rowspan-tag-properties.JPG
> Tagging attribute for TH Scope is overwritten by span attributes
> ----------------------------------------------------------------
>
> Key: FOP-3167
> URL: https://issues.apache.org/jira/browse/FOP-3167
> Project: FOP
> Issue Type: Bug
> Reporter: Nico Kutscherauer
> Priority: Major
> Labels: Accessibility, Table, Tagging
> Attachments: colspan-rowspan-tag-properties.JPG,
> scope-with-colspan.fo, scope-with-colspan.pdf, scope-with-colspan_headA.jpg,
> scope-with-colspan_headC.jpg
>
>
> If a table cell has the role {{TH}} it gets a scope info as PDF tag attribute
> (Entry A) with the name {{/Scope}} and a value {{Column}} (default), {{Row}}
> or {{{}Both{}}}.
> This works fine, but if the {{fo:table-cell}} has an additional
> {{number-columns-spanned}} attribute, the Scope info is lost.
> The attached FO document ([^scope-with-colspan.fo]) shows two table head
> cells only one with {{{}number-columns-spanned{}}}{{{}=2{}}}.
> The screenshot shows the tag property view in Acrobat of the rendered PDF
> ([^scope-with-colspan.pdf]) for both cells.
> One has the ColSpan attribute but no Scope info:
> !scope-with-colspan_headA.jpg|width=591!
> The other with no ColSpan attribute has the Scope info:
> !scope-with-colspan_headC.jpg|width=591!
> The reason for the behavior of FOP is that the scope is written directly as
> {{{}"A"{}}}-Entry:
> {code:java}
> static void addScopeAttribute(PDFStructElem th, Scope scope) {
> PDFDictionary scopeAttribute = new PDFDictionary();
> scopeAttribute.put("O", Table.NAME);
> scopeAttribute.put("Scope", scope.getName());
> th.put("A", scopeAttribute);
> }
> {code}
> Source:
> [StandardStructureAttributes.java:58|https://github.com/apache/xmlgraphics-fop/blob/cb26fed42b675c576d8f4b69827a32a25e36c5bb/fop-core/src/main/java/org/apache/fop/pdf/StandardStructureAttributes.java#L58-L63]
> But the colspan/rowspan attributes are collected as a special {{attribute}}
> field of PDFStructElem:
> {code:java}
> public void setTableAttributeColSpan(int colSpan) {
> setTableAttributeRowColumnSpan("ColSpan", colSpan);
> }
> public void setTableAttributeRowSpan(int rowSpan) {
> setTableAttributeRowColumnSpan("RowSpan", rowSpan);
> }
> private void setTableAttributeRowColumnSpan(String typeSpan, int span) {
> PDFDictionary attribute = new PDFDictionary();
> attribute.put("O", Table.NAME);
> attribute.put(typeSpan, span);
> if (attributes == null) {
> attributes = new ArrayList<PDFDictionary>(2);
> }
> attributes.add(attribute);
> }
> {code}
> Source:
> [PDFStructElem.java:230|https://github.com/apache/xmlgraphics-fop/blob/cb26fed42b675c576d8f4b69827a32a25e36c5bb/fop-core/src/main/java/org/apache/fop/pdf/PDFStructElem.java#L230-L246]
> At the end the field attribute overwrites the {{{}"A"{}}}-Entry:
> {code:java}
> private void attachAttributes() {
> if (attributes != null) {
> if (attributes.size() == 1) {
> put("A", attributes.get(0));
> } else {
> PDFArray array = new PDFArray(attributes);
> put("A", array);
> }
> }
> }
> {code}
> Source:
> [PDFStructElem.java:174|https://github.com/apache/xmlgraphics-fop/blob/cb26fed42b675c576d8f4b69827a32a25e36c5bb/fop-core/src/main/java/org/apache/fop/pdf/PDFStructElem.java#L174-L183]
> I will see If I can produce a patch in the next days.
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