Once upon a time, I filed a bug to support external context menus for textboxes. My goal then (and now) was to allow me to create new context menu items which would include the default context menu items, fully functional. Unfortunately, today when I tried to do that, it just didn’t work. For some reason, my new code couldn’t call on the controller with the right arguments.
So, I went back to the drawing board.
textbox.xml (xpfe version) is somewhat convoluted. You have the master textbox bindings (id=”textbox”, “textarea”), which contain a <xul:hbox/> that has its own special binding (id=”input-box”) on it, and a <html:input/> element as a child of the hbox. The hbox’s binding includes the <xbl:children/> and a context menupopup designed for it.
Unfortunately, there doesn’t appear to be a very direct way to add menu items to this special context menu. You can’t just include a <xul:menuitem/> or <xul:menuseparator/> as a real child element of the textbox. In fact, any child elements of the textbox at all seem to break the textbox quite badly.
What’s the solution?
Well, the <xbl:implementation/> and <xbl:handlers/> of the textbox primary bindings, and of its hbox, are pretty reliable. So I create two new bindings for <xbl:content/>, one for the textbox, and one for the textbox’s special context-menu hbox. These bindings otherwise extend the primary bindings of the textbox. A little CSS and a new type attribute for the modified textbox, plus a modified oncommand event handler for the context-menu hbox (to allow for my new commands), and remarkably enough, everything works.
That said, it’s still a very convoluted path. I’m doing a lot of work for a very tiny effect, and I spent hours chasing down other ratholes before realizing this solution. I wish the textbox.xml bindings actually let me insert menuitems and menuseparators directly as child elements of the textbox, to become additional, homegrown commands for the textbox or parent application. But I’m not quite sure how to modify the textbox.xml bindings to pull this off. Maybe a couple <xbl:children includes='menuitem,menuseparator'/> elements strategically placed are all I need to add to the textbox.xml bindings, along with the modified oncommand event handler… but I don’t know.
Opinions, anyone? If I’m going to file a bug to fix this, I should know how to do the fix. We also have to consider editable menulists.
P.S
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. Source code for the new bindings is available upon request. Yes, it’s for Verbosio. No, it’s not finished.
UPDATE: My guess above turned out to be right! I’ll be filing a bug shortly to add this functionality.
UPDATE 2 Bug 312869, though it has stalled.