Running into the same kinds of issues almost a year after this post (using
GWT 2.0.4)...
Need to set alt text and need to discern both tree selection and hierarchy
with CSS turned off.
This can be made more elegant but here is the strategy (some GWT Tree
assumptions are made here)...
We are adding and OpenHandler and CloseHandler to the Tree.
Each handler checks if the TreeItem has children then it has an expand or
collapse (+/-) child image (may want to consider whether or not you have
leaf images).
For each TreeItem with children, item, whose <img> alt or title attributes
you want to set, access its <img> tags:
NodeList<com.google.gwt.dom.client.Element> imgs =
item.getElement().getElementsByTagName("img");
access the first Element in this set because this is the +/- img and set the
attributes you want:
com.google.gwt.dom.client.Element elem = imgs.getItem(0);
elem.setAttribute("alt", "...");
elem.setAttribute("title", "...");
Our selected strategy is to append to the beginning of the selected
TreeItem's text a selected character (ex. right-facing triangle).
Still working on a solution to showing tree depth with CSS off.
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