[OpenLayers-Dev] mouse cursors

[Zac Spitzer]

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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>



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Zac Spitzer -
http://zacster.blogspot.com (My Blog)
+61 405 847 168