private static void beginCompoundChange(ITextViewer viewer) {
if (viewer instanceof ITextViewerExtension) {
ITextViewerExtension extension = (ITextViewerExtension) viewer;
IRewriteTarget target = extension.getRewriteTarget();
target.beginCompoundChange();
}
}
private static void applyProposal(
ICompletionProposal proposal,
ITextViewer viewer,
char trigger,
int stateMask,
final int offset) {
Assert.isTrue(proposal instanceof ICompletionProposalExtension2);
IRewriteTarget target = null;
IEditingSupportRegistry registry = null;
IEditingSupport helper =
new IEditingSupport() {
public boolean isOriginator(DocumentEvent event, IRegion focus) {
return focus.getOffset() <= offset && focus.getOffset() + focus.getLength() >= offset;
}
public boolean ownsFocusShell() {
return false;
}
};
try {
IDocument document = viewer.getDocument();
if (viewer instanceof ITextViewerExtension) {
ITextViewerExtension extension = (ITextViewerExtension) viewer;
target = extension.getRewriteTarget();
}
if (target != null) target.beginCompoundChange();
if (viewer instanceof IEditingSupportRegistry) {
registry = (IEditingSupportRegistry) viewer;
registry.register(helper);
}
((ICompletionProposalExtension2) proposal).apply(viewer, trigger, stateMask, offset);
Point selection = proposal.getSelection(document);
if (selection != null) {
viewer.setSelectedRange(selection.x, selection.y);
viewer.revealRange(selection.x, selection.y);
}
} finally {
if (target != null) target.endCompoundChange();
if (registry != null) registry.unregister(helper);
}
}