1 files changed, 51 insertions, 0 deletions
diff --git a/Source/SPTableRelations.m b/Source/SPTableRelations.m
index 20059fbb..6b959430 100644
--- a/Source/SPTableRelations.m
+++ b/Source/SPTableRelations.m
@@ -541,6 +541,57 @@ static NSString *SPRelationOnDeleteKey   = @"on_delete";
 }
 
 #pragma mark -
+#pragma mark TextField delegate methods
+
+- (void)controlTextDidChange:(NSNotification *)notification
+{
+	// Make sure the user does not enter a taken name, using the quickly-generated incomplete list
+	if ([notification object] == constraintName) {
+		NSString *userValue = [[constraintName stringValue] lowercaseString];
+
+		// Make field red and disable add button
+		if ([takenConstraintNames containsObject:userValue]) {
+			[constraintName setTextColor:[NSColor redColor]];
+			[confirmAddRelationButton setEnabled:NO];
+		}
+		else {
+			[constraintName setTextColor:[NSColor controlTextColor]];
+			[confirmAddRelationButton setEnabled:YES];
+		}
+	}
+}
+
+#pragma mark -
+#pragma mark Tableview delegate methods
+
+/**
+ * Called whenever the relations table view selection changes.
+ */
+- (void)tableViewSelectionDidChange:(NSNotification *)notification
+{
+	[removeRelationButton setEnabled:([relationsTableView numberOfSelectedRows] > 0)];
+}
+
+/*
+ * Double-click action on table cells - for the time being, return
+ * NO to disable editing.
+ */
+- (BOOL)tableView:(NSTableView *)tableView shouldEditTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)rowIndex
+{
+	if ([tableDocumentInstance isWorking]) return NO;
+
+	return NO;
+}
+
+/**
+ * Disable row selection while the document is working.
+ */
+- (BOOL)tableView:(NSTableView *)tableView shouldSelectRow:(NSInteger)rowIndex
+{
+	return ![tableDocumentInstance isWorking];
+}
+
+#pragma mark -
 #pragma mark Private API
 
 /**