Drag and drop, first working attempt

gistfile1.m

-(void)moveToLocation:(NSPoint)location withInitialMousePosition:(NSPoint)position
{
    isDragging = YES; 
    windowContentView = [[self window]contentView]; 
    if (isDragging) {
        //down
        if (previousMousePosition.y > location.y) {
            float current = position.y - location.y;
            swapForce = round(current/drop_height); 
            if (swapForce != 0 && swapForce != previousSwapForce) {
                [delegate swapDown:self];
            }
        }
        //up
        else{
            float current = location.y - position.y;
            swapForce = round(current/drop_height);
            if (swapForce != 0 && swapForce != previousSwapForce) {
                [delegate swapUp:self];
            }
        }
        (location.x > 85) ? [self setHideAfterDragginOperation:YES] : [self setHideAfterDragginOperation:NO]; 
    }
    [self setFrameOrigin:NSMakePoint(location.x - mouse_in_icon, location.y-mouse_in_icon)];
    [windowContentView addSubview:self];
    previousSwapForce = swapForce; 
    previousMousePosition = location; 
}