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macOS a11y: rebuild table model if out-of-bounds cell is requested 

While it is the itemview's responsibility to keep the accessibility
bridge updated about changes in the view's structure and size, we
have experienced a number of assertions getting triggered when that
wasn't done correctly.
Instead of an assert (or hard crash in release builds), recreate the
table representation in the accessibility bridge when a cell that is
out-of-bounds for the current representation is requested. Emit a
warning message to inform widget authors, and improve the debug
message with information about the column count as well.

Amends 52c2b82082.

Pick-to: 6.7 6.6
Change-Id: I19c20a932153268a5176d7378c485277088f10bf
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb10
Volker Hilsheimer 2023-12-09 15:17:54 +01:00
parent 4271114dc6
commit c81e31461f
1 changed files with 34 additions and 7 deletions
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41
src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm
View File

@ -135,19 +135,37 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
if (tableInterface) {
auto *tableElement = [QMacAccessibilityElement elementWithInterface:table];
Q_ASSERT(tableElement);
if (!tableElement->rows
|| int(tableElement->rows.count) <= m_rowIndex
|| int(tableElement->rows.count) != tableInterface->rowCount()) {
qCWarning(lcAccessibilityTable)
<< "Cell requested for row" << m_rowIndex << "is out of"
<< "bounds for table with" << (tableElement->rows ?
tableElement->rows.count : tableInterface->rowCount())
<< "rows! Resizing table model.";
[tableElement updateTableModel];
}
Q_ASSERT(tableElement->rows);
Q_ASSERT(int(tableElement->rows.count) > m_rowIndex);
auto *rowElement = tableElement->rows[m_rowIndex];
if (!rowElement->columns || int(rowElement->columns.count) != tableInterface->columnCount()) {
if (rowElement->columns) {
qCWarning(lcAccessibilityTable)
<< "Table representation column count is out of sync:"
<< rowElement->columns.count << "!=" << tableInterface->columnCount();
}
rowElement->columns = [rowElement populateTableRow:rowElement->columns
count:tableInterface->columnCount()];
}
qCDebug(lcAccessibilityTable) << "Creating cell representation for"
<< m_rowIndex << m_columnIndex
<< "in table with"
<< tableElement->rows.count << "rows";
<< tableElement->rows.count << "rows and"
<< rowElement->columns.count << "columns";
Q_ASSERT(int(tableElement->rows.count) > m_rowIndex);
auto *rowElement = tableElement->rows[m_rowIndex];
if (!rowElement->columns) {
rowElement->columns = [rowElement populateTableRow:rowElement->columns
count:tableInterface->columnCount()];
}
rowElement->columns[m_columnIndex] = self;
}
}
@ -223,6 +241,10 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
- (NSMutableArray *)populateTableArray:(NSMutableArray *)array role:(NSAccessibilityRole)role count:(int)count
{
if (QAccessibleInterface *iface = self.qtInterface) {
if (array && int(array.count) != count) {
[array release];
array = nil;
}
if (!array) {
array = [NSMutableArray<QMacAccessibilityElement *> arrayWithCapacity:count];
[array retain];
@ -253,6 +275,11 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
- (NSMutableArray *)populateTableRow:(NSMutableArray *)array count:(int)count
{
Q_ASSERT(synthesizedRole == NSAccessibilityRowRole);
if (array && int(array.count) != count) {
[array release];
array = nil;
}
if (!array) {
array = [NSMutableArray<QMacAccessibilityElement *> arrayWithCapacity:count];
[array retain];