NStableView Cocoa

Question

I populated my NStableView with tableView Controller and it's working fine. I only want to know why every time I am getting the data (Presented in table Cell) whenever the user hovers on a particular cell in a tableview, it starts displaying the data in console.

I found that this - (NSCell *)tableView:(NSTableView *)tableView dataCellForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row calls every time and I stack traced using instruments and this method is taking a lot of memory.

Is there any way to stop this method drawing the data every time.

Answer 1

Add the delegate -viewWillMoveToWindow to the view subclass contain the table. here i have used the BOOL named reloadTable. NSTrackingArea is the answer for your problem

- (void) viewWillMoveToWindow:(NSWindow *)newWindow
{
    // Setup a new tracking area when the view is added to the window.
    NSTrackingArea* trackingArea = [[NSTrackingArea alloc] initWithRect:[yourTable frame]
                options: (NSTrackingMouseEnteredAndExited |  
                NSTrackingActiveAlways|NSTrackingEnabledDuringMouseDrag) owner:self userInfo:nil];
    [self addTrackingArea:trackingArea];

}

- (void) mouseEntered:(NSEvent*)theEvent {
    reloadTable=YES;
    NSLog(@"enter %@",theEvent);

}

- (void) mouseExited:(NSEvent*)theEvent {

     reloadTable=YES;

}

then use it in your NSTableViewDataSource methods