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a11y atspi: Set correct child index in children-changed:add event

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When sending an object:children-changed:add AT-SPI2 event,
set the actual index of the child instead of always using
the child count of its parent.

If the new child were added at the end, its index would be
"[child count] - 1", but the new child doesn't necessarily
have to have been added at the end.

Therefore, use the actual child index either already used as loop
variable or retrieved via QAccessibleInterface::indexOfChild
instead.

The mismatch could e.g. be demonstrated with a simple pyatspi
script when typing Enter in LibreOffice Writer to create
new paragraphs.

Script:

    #!/usr/bin/python3
    import pyatspi
    def listener(e):
        if not e.host_application.name.startswith('soffice'):
            return
        print(e)
        print(f'index in parent set in event: {e.detail1}')
        print(f'index in parent reported by child: {e.any_data.get_index_in_parent()}')
    pyatspi.Registry.registerEventListener(listener, "object:children-changed:add")
    pyatspi.Registry.start()

Sample output without this commit in place:

    object:children-changed:add(4, 0, [paragraph | ])
            source: [document frame | Untitled 1 - LibreOfficeDev Document]
            host_application: [application | soffice.bin]
            sender: [application | soffice.bin]
    index in parent set in event: 4
    index in parent reported by child: 2

Sample output with this commit in place:

    object:children-changed:add(2, 0, [paragraph | ])
            source: [document frame | Untitled 1 - LibreOfficeDev Document]
            host_application: [application | soffice.bin]
            sender: [application | soffice.bin]
    index in parent set in event: 2
    index in parent reported by child: 2

Pick-to: 6.8
Change-Id: I30316c59f8ad6fd018089a8dca8e7a8d1d92d7ec
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 5e7891f73fb1ba33a08ac9bd3fbcdab01d8a1193)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 33f8d0834320ffed5b5dd60fcc2fcfe378933d29)
This commit is contained in:
Michael Weghorn 2025-05-01 19:04:10 +02:00 committed by Qt Cherry-pick Bot
parent 9b85022d56
commit 3a39afef84
1 changed files with 5 additions and 5 deletions
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10
src/gui/accessible/linux/atspiadaptor.cpp
View File

@ -1383,10 +1383,10 @@ void AtSpiAdaptor::sendFocusChanged(QAccessibleInterface *interface) const
void AtSpiAdaptor::childrenChanged(QAccessibleInterface *interface) const
{
QString parentPath = pathForInterface(interface);
int childCount = interface->childCount();
for (int i = 0; i < interface->childCount(); ++i) {
const int childCount = interface->childCount();
for (int i = 0; i < childCount; ++i) {
QString childPath = pathForInterface(interface->child(i));
QVariantList args = packDBusSignalArguments("add"_L1, childCount, 0, childPath);
QVariantList args = packDBusSignalArguments("add"_L1, i, 0, childPath);
sendDBusSignal(parentPath, ATSPI_DBUS_INTERFACE_EVENT_OBJECT ""_L1, "ChildrenChanged"_L1, args);
}
}
@ -1400,9 +1400,9 @@ void AtSpiAdaptor::notifyAboutCreation(QAccessibleInterface *interface) const
return;
}
QString path = pathForInterface(interface);
int childCount = parent->childCount();
const int childIndex = parent->indexOfChild(interface);
QString parentPath = pathForInterface(parent);
QVariantList args = packDBusSignalArguments("add"_L1, childCount, 0, variantForPath(path));
QVariantList args = packDBusSignalArguments("add"_L1, childIndex, 0, variantForPath(path));
sendDBusSignal(parentPath, ATSPI_DBUS_INTERFACE_EVENT_OBJECT ""_L1, "ChildrenChanged"_L1, args);
}