Implement query cancellation support within MCPKit, and add it to the task functionality:

 - MCPKit now supports cancelling the active query; for MySQL servers >= 5.0.0 a query kill is attempted from a new connection, and if that fails or for MySQL < 5 a reconnect is triggered.
 - TableDocument now supports enabling a cancel task button on the task interface, including an optional callback
 - Implement query cancellation for custom queries.  This addresses Issue #86.
 - Implement query cancellation for table content loads, filters, and sorts.

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/TableDocument.h b/Source/TableDocument.h
index f9e96730..db4b48ae 100644
--- a/Source/TableDocument.h
+++ b/Source/TableDocument.h
@@ -138,6 +138,9 @@
 	float taskProgressValueDisplayInterval;
 	NSTimer *taskDrawTimer;
 	NSViewAnimation *taskFadeAnimator;
+	BOOL taskCanBeCancelled;
+	id taskCancellationCallbackObject;
+	SEL taskCancellationCallbackSelector;
 
 	NSToolbar *mainToolbar;
 	NSToolbarItem *chooseDatabaseToolbarItem;
@@ -186,6 +189,9 @@
 - (void) setTaskPercentage:(float)taskPercentage;
 - (void) setTaskProgressToIndeterminate;
 - (void) endTask;
+- (void) enableTaskCancellationWithTitle:(NSString *)buttonTitle callbackObject:(id)callbackObject callbackFunction:(SEL)callbackFunction;
+- (void) disableTaskCancellation;
+- (IBAction) cancelTask:(id)sender;
 - (BOOL) isWorking;
 - (void) setDatabaseListIsSelectable:(BOOL)isSelectable;
 - (void) centerTaskWindow;