Re: acceptsMouseMovedEvents?

FROM : Brian O'Brien
DATE : Wed Apr 27 23:41:37 2005

On Apr 27, 2005, at 3:26 PM, glenn andreas wrote:

>
> On Apr 27, 2005, at 4:11 PM, Brian O'Brien wrote:
>

>>
>> On Apr 27, 2005, at 2:44 PM, Clark Cox wrote:
>>

>>> On 4/27/05, Brian O'Brien <<email_removed>> wrote:

>>>>
>>>> On Apr 27, 2005, at 2:32 PM, Brian O'Brien wrote:
>>>>

>>>>> In my subclass of NSImageView I want to receive mouse move events.
>>>>> I defined the method acceptsMouseMovedEvents and returned true.
>>>>> I also defined the method - (void)mouseMoved:(NSEvent *)theEvent
>>>>> and put an NSLog message in that function. However I get no mouse
>>>>> motion events.
>>>>>

>>>>
>>>> in my init I did
>>>> [[self window] setAcceptsMouseMovedEvents:YES];

>>>
>>> While inside you're init method, [self window[ cannot possibly be
>>> returning anything other than nil. That is, if the view's still being
>>> init'ed, it can't have been placed in a superview yet.
>>>

>> I got tracking rects working and I also got mouseEntered and 
>> mouseExited events...
>> I figured I could add [[self window] setAcceptsMouseMovedEvents:YES] 
>> in the
>> entered event and turn them off in the exited event... but still no 
>> mouseMoved events...
>>

>
> I seem to remember (but my memory could be faulty on this one) that 
> you need to be the first responder to get the mouse moved events (this 
> may have been to get the modifier changed flags though - it's all a 
> bit blurry).
>
> Glenn Andreas                      <email_removed> 
>  <http://www.gandreas.com/> oh my!
> quadrium | build, mutate, evolve | images, textures, backgrounds, art
>
>


After a bit of muddling around this works:

/
*-----------------------------------------------------------------------
-------\
| The following functions are for setting up to receive mouse movement 
events.  |
| the mouse movement events are turned on when the mouse enteres the 
frame and  |
| off when the mouse leaves the frame.                                 
        |
\-----------------------------------------------------------------------
-------*/
- (void)clearTrackingRect
{
    if (rolloverTrackingRectTag > 0)
    {
        [self removeTrackingRect:rolloverTrackingRectTag];
        rolloverTrackingRectTag = 0;
    }
}

- (void)resetTrackingRect
{
    [self clearTrackingRect];
    rolloverTrackingRectTag = [self addTrackingRect:[self visibleRect] 
owner:self userData:NULL assumeInside:NO];
}

- (void)resetCursorRects
{
    [super resetCursorRects];
    [self resetTrackingRect];
}

- (void)viewDidMoveToWindow
{
    if ([self window]) {
        [self resetTrackingRect];
    }
}

- (void)mouseEntered:(NSEvent *)theEvent
{
    NSLog(@"Mouse Entered");
    [ [self window] setAcceptsMouseMovedEvents:YES];
    NSLog(@"Accepting mouse movements.");
    [ [self window] makeFirstResponder:self];
}

- (void)mouseMoved:(NSEvent *)theEvent
{
    NSLog(@"mouse moved %@", theEvent);
}

- (void)mouseExited:(NSEvent *)theEvent
{
    NSLog(@"Mouse Exited");
    [[self window] setAcceptsMouseMovedEvents:NO];
    NSLog(@"No longer accepting mouse movements.");
}