attribution and copyright field

[anonymous & jrf]

To make it easy for proprietary data licensees to present the data they have bought in OpenLayers.Layer directly, e.g. by using the WMS layer or an adaptation of that to their own tiling scheme, we need to add methods of obeying the attribution and copyright requirements of these data sources. Typically a line of text at the bottom of the map window is sufficient.

Since maps contain many layers, the attribution text must be able to handle additions from many layers -- gracefully! The attribution text should also allow HTML so that it can contain hyperlinks, bolding, © etc.

A key requirement for most of the data providers that require attribution text is that it be visible when someone takes a screenshot. That means that the attribution text can disappear when data from that layer is not visible.

[openlayers]

A patch for adding the copyright text to each layer

[crschmidt]

Erik --

Can you look at http://openlayers.org/pipermail/dev/2007-May/000705.html , which is blocking this, and let me know if this event can be dropped?

[euzuro]

coding standards, adding some documentation bits and also rearranging the functions in the new control. no functional diff. you like?

[euzuro]

(In [4231]) adding OpenLayers.Control.Attribution to the list of controls in the OL suite. includes example and tests. very nice. Thanks to pensyakito and cr5 for getting this together and complete. (Closes #103)

[fredj]

 http://www.openlayers.org/dev/examples/attribution.html don't work for me.

On page load the attribution is correctly set but when I change the base layer with the layer switcher, the attribution is empty.

FF 2.0.0.6 on Linux

in source:trunk/openlayers/lib/OpenLayers/Control/Attribution.js line 69, layer.getVisibility() always return false (race condition ?)

[fredj]

and replace 'seperator' with 'separator'

[crschmidt]

fredj: nice catch.

Attached patch does both of these:

1. register for changebaselayer, since changelayer is only called in setBaseLayer *before* the layer has actually changed.

2. Fix speling. (That was intentional.)

[crschmidt]

(In [4237]) FredJ reviewed my work here and said it solved the problem that he reopened 103 for (specifically, that baselayer changes always resulted in a null attribution string), and fixes spelling. This commit makes the attribution control work and stuff. (Closes #103)