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.

just maintain a flag which observe when your table view is refreshed manually — vignesh kumar, Nov 20 '12 at 15:24
How can i check programmatically whether user is hovering over NSTableView? Whenever i take the curosr over tableView dataCellForTableColumn is called every time. — york, Nov 21 '12 at 04:32

vignesh kumar · Accepted Answer · 2012-11-21T05:51:57.880

0

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

edited Nov 21 '12 at 05:51

answered Nov 21 '12 at 04:51

vignesh kumar

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I am getting an error in [self addTrackingArea:trackingArea]; should i use [tableView addTrackingArea:trackingArea]; ? – york Nov 21 '12 at 05:38
viewWillMoveToWindow is not calling, i have used NSViewController to display the views. – york Nov 21 '12 at 05:49
sorry bro the viewWillMoveToWindow is an NSView method all the above method has to be implemented in NSView subclass – vignesh kumar Nov 21 '12 at 05:55
Is it a wrong approach to add a NSViewController in NSWindow - (void)setController:(NSViewController *)controller { [[currentController view] removeFromSuperview]; NSView *view = [controller view]; view.frame = ((NSView*)self.window.contentView).bounds; [_window setContentView:view]; //[_window.contentView addSubview:view]; } – york Nov 21 '12 at 05:57
No it is not. U can use NSWindowController or NSViewController ,either way u can achieve navigating between views – vignesh kumar Nov 21 '12 at 06:07
Can you please share some references as i am not getting how i navigate between views in cocoa, i created NSViewControllers but for navigation from one view to another i am using the above mentioned code. I want something like in iOS development (Navigation Controller type feature for COCOA) – york Nov 21 '12 at 06:12

NStableView Cocoa

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