ROTableView.m

   1 #import "ROTableView.h"
   2
   3
   4 @implementation ROTableView
   5 - (void)awakeFromNib
   6 {
   7         [[self window] setAcceptsMouseMovedEvents:YES];
   8         trackingTag = [self addTrackingRect:[self frame] owner:self userData:nil assumeInside:NO];
   9         mouseOverView = NO;
  10         mouseOverRow = -1;
  11         lastOverRow = -1;
  12 }
  13
  14 - (void)dealloc
  15 {
  16         [self removeTrackingRect:trackingTag];
  17         [super dealloc];
  18 }
  19
  20 - (void)mouseEntered:(NSEvent*)theEvent
  21 {
  22         mouseOverView = YES;
  23 }
  24
  25 - (void)mouseMoved:(NSEvent*)theEvent
  26 {
  27         id myDelegate = [self delegate];
  28
  29         if (!myDelegate)
  30                 return; // No delegate, no need to track the mouse.
  31         if (![myDelegate respondsToSelector:@selector(tableView:willDisplayCell:forTableColumn:row:)])
  32                 return; // If the delegate doesn't modify the drawing, don't track.
  33
  34         if (mouseOverView) {
  35                 mouseOverRow = [self rowAtPoint:[self convertPoint:[theEvent locationInWindow] fromView:nil]];
  36
  37                 if (lastOverRow == mouseOverRow)
  38                         return;
  39                 else {
  40                         [self setNeedsDisplayInRect:[self rectOfRow:lastOverRow]];
  41                         lastOverRow = mouseOverRow;
  42                 }
  43
  44         [self setNeedsDisplayInRect:[self rectOfRow:mouseOverRow]];
  45         }
  46 }
  47
  48 - (void)mouseExited:(NSEvent *)theEvent
  49 {
  50         mouseOverView = NO;
  51         [self setNeedsDisplayInRect:[self rectOfRow:mouseOverRow]];
  52         mouseOverRow = -1;
  53         lastOverRow = -1;
  54 }
  55
  56 - (int)mouseOverRow
  57 {
  58         return mouseOverRow;
  59 }
  60
  61 - (void)viewDidEndLiveResize
  62 {
  63         [super viewDidEndLiveResize];
  64
  65         [self removeTrackingRect:trackingTag];
  66         trackingTag = [self addTrackingRect:[self frame] owner:self userData:nil assumeInside:NO];
  67 }
  68
  69 @end