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On Windows, there are several standard relations under MSAA, for example, a Label preceeding a Text will provide the accessible name for the Text. On GTK, these relations were implemented for SWT using ATK relations. (see Control.setRelations() and Label.addRelation() in the GTK code) Need to implement these on Mac OS X.
Implementation info: Use HIObjectSetAuxiliaryAccessibilityAttribute for both elements. Example: HIObjectSetAuxiliaryAccessibilityAttribute(x, kAXTitleUIElementAttribute, y); and HIObjectSetAuxiliaryAccessibilityAttribute(x, kAXServesAsTitleForUIElementsAttribute, y);
Created attachment 99124 [details] _patch.txt Patch for the fix. One new native.
Test snippet that tests label and control insertions and deletions to make sure all relations are added and removed correctly. import org.eclipse.swt.*; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.*; import org.eclipse.swt.widgets.*; public class LabelForTextTest { static int count = 0; static Label currentLabel; static Text currentText; public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new GridLayout(2, false)); final Composite parent = new Composite(shell, SWT.BORDER); parent.setLayout(new FillLayout()); parent.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1)); currentLabel = new Label(parent, SWT.NONE); currentLabel.setText("Title:"); currentText = new Text(parent, SWT.BORDER); currentText.setText("Hello"); Button button = new Button(shell, SWT.PUSH); button.setText("Insert Label"); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { Label label = new Label(parent, SWT.NONE); count++; label.setText("Title" + count + ":"); if (currentText != null) label.moveAbove(currentText); // if (currentLabel != null) label.moveBelow(currentLabel); currentLabel = label; parent.layout(); } }); button = new Button(shell, SWT.PUSH); button.setText("Insert Text"); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { Text text = new Text(parent, SWT.BORDER); count++; text.setText("Hello" + count); if (currentText != null) text.moveAbove(currentText); currentText = text; parent.layout(); } }); button = new Button(shell, SWT.PUSH); button.setText("Delete Label"); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { if (currentLabel != null) { currentLabel.dispose(); currentLabel = null; Control [] children = parent.getChildren(); for (int i = 0; i < children.length; i++) { if (children[i] instanceof Label) { currentLabel = (Label)children[i]; } } } parent.layout(); } }); button = new Button(shell, SWT.PUSH); button.setText("Delete Text"); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { if (currentText != null) { currentText.dispose(); currentText = null; Control [] children = parent.getChildren(); for (int i = 0; i < children.length; i++) { if (children[i] instanceof Text) { currentText = (Text)children[i]; break; } } } parent.layout(); } }); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }
Fixed > 20080507
