add tooltips to Textboxes

src/makielayout/blocks/textbox.jl

@@ -113,6 +113,22 @@ function initialize_block!(tbox::Textbox)
     # trigger bbox
     tbox.layoutobservables.suggestedbbox[] = tbox.layoutobservables.suggestedbbox[]
 
+    ttposition = lift(tbox.tooltip_placement, tbox.layoutobservables.computedbbox) do placement, bbox
+        if placement == :above
+            bbox.origin + Point2f((bbox.widths[1]/2, bbox.widths[2]))
+        elseif placement == :below
+            bbox.origin + Point2f((bbox.widths[1]/2, 0))
+        elseif placement == :left
+            bbox.origin + Point2f((0, bbox.widths[2]/2))
+        elseif placement == :right
+            bbox.origin + Point2f((bbox.widths[1], bbox.widths[2]/2))
+        end
+    end
+    ttvisible = lift((x,y)->x && y, tbox.tooltip_enable, hovering)
+    tt = tooltip!(topscene, ttposition, tbox.tooltip_text,
+                  visible=ttvisible, placement=tbox.tooltip_placement, overdraw=true;
+                  tbox.tooltip_kwargs[]...)
+
     mouseevents = addmouseevents!(scene)
 
     onmouseleftdown(mouseevents) do state

src/makielayout/types.jl

@@ -1485,6 +1485,14 @@ end
         restriction = nothing
         "The color of the cursor."
         cursorcolor = :transparent
+        "The String displayed by the tooltip."
+        tooltip_text = ""
+        "Sets where the tooltip should be placed relative to the Textbox. Can be :above, :below, :left, :right."
+        tooltip_placement = :above
+        "Controls whether the tooltip will be rendered or not."
+        tooltip_enable = false
+        "Keyword arguments to pass to the tooltip.  See the tooltip docstring for valid attributes."
+        tooltip_kwargs = ()
     end
 end