[OpenLayers-Dev] mouse cursors

[bartvde at osgis.nl]

Yeah, I've seen that as well (also in FF2 on Windows and IE6 btw, at least
on my computer).

I could not find a workaround however to prevent this behaviour, i.e. when
changing the cursor from a url cursor to another url cursor, the default
cursor appears for a while in between.

Best regards,
Bart

On Wed, 23 Apr 2008 22:35:37 +1000, "Zac Spitzer" <zac.spitzer at gmail.com>
wrote:
> looks great in firefox, ie7 seems to "flutter" between dragging between
> the pointer cursor and the 'action' cursor
> 
> On Wed, Apr 23, 2008 at 9:18 PM,  <bartvde at osgis.nl> wrote:
>> Hi list,
>>
>>  I've been working a bit on mouse cursors in OL, and would like to
> request
>>  some feedback on the current approach.
>>
>>  I've got an example up in my sandbox:
>>  http://dev.openlayers.org/sandbox/bartvde/cursor/examples/cursor.html
>>
>>  And I've added a very preliminary patch to ticket1484:
>>  http://trac.openlayers.org/attachment/ticket/1484/ticket1484.patch
>>
>>  I'll try and outline my approach a bit. The most difficult decision I
> found
>>  was whether or not to use css. I find it quite a bit of overhead to
> make
>>  css classes for all possible cursor combinations. In my case I would
> need
>>  the following classes (looks already quite cumbersome to me):
>>
>>  .olControlZoomBoxCursor
>>  .olControlZoomBoxOutCursor
>>  .olControlDragPanCursor
>>  .olControlDragPanMouseupCursor
>>  .olControlDragPanMousedownCursor
>>
>>  etc.? As you can see, even control properties (like the out property
> for
>>  ZoomBox) come into play, so we would need something like a cursorClass
>>  property for people to override the default class names. For the
> approach
>>  to work, we would need them to start their names with the 'olControl'
>>  prefix, otherwise we don't know which css classes are safe to remove
> from
>>  the map div when e.g. a different control is activated (we cannot just
>>  remove any css class from the map div, since people might have set
> stuff on
>>  it, so we should remove all classes that start with 'olControl' or some
>>  similar approach). This can be error-prone IMHO.
>>
>>  I did see there are some utility functions (like addClass, removeClass,
>>  toggleClass) in topp's almanac sandbox which could be used.
>>
>>  Disadvantage ofcourse of my approach is that the mouse cursors cannot
>>  easily be altered by non-programmers, but I wonder how often a chosen
>>  cursor approach will change in a project.
>>
>>  If people feel strongly that css is the way to go though, I can change
> the
>>  code to add and remove css classes on the map div.
>>
>>  What I've done is briefly:
>>
>>  * add a cursor property on the Control class, which is set on the map
> div
>>  when the control is activated
>>  * add a cursors property (array) on the Handler class, which makes it
>>  possible to set cursors on the map div in different functions of a
> Handler
>>  (like mousedown). For now I've only implemented mousedown and mouseup
> in
>>  the Drag Handler as an example.
>>
>>  I think the example and the patch tells the rest of the story best.
>>
>>  Feedback very much welcome. TIA.
>>
>>  Best regards,
>>  Bart
>>
>>  _______________________________________________
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>>  http://openlayers.org/mailman/listinfo/dev
>>
> 
> 
> 
> --
> Zac Spitzer -
> http://zacster.blogspot.com (My Blog)
> +61 405 847 168