Add hover_tooltips, hover_formatters, hover_mode (#1385)

* Add hover_tooltips

* address comments

doc/user_guide/Customization.ipynb

@@ -66,6 +66,16 @@
     "    hover_cols (default=[]): list or str\n",
     "        Additional columns to add to the hover tool or 'all' which will\n",
     "        includes all columns (including indexes if use_index is True).\n",
+    "    hover_tooltips list[str] or list[tuple]:\n",
+    "        A list of dimensions to be displayed in the hover tooltip. See\n",
+    "        [HoloViews docs](https://holoviews.org/user_guide/Plotting_with_Bokeh.html#hover-tools)\n",
+    "        or [Bokeh docs](https://docs.bokeh.org/en/latest/docs/user_guide/interaction/tools.html#hovertool)\n",
+    "        for more info on structuring.\n",
+    "    hover_formatters:\n",
+    "        A dict of formatting options for the hover tooltip.\n",
+    "    hover_mode (default='mouse'):\n",
+    "        The hover mode determines how the hover tool is activated;\n",
+    "        select from 'mouse', 'vline', or 'hline'.\n",
     "    invert (default=False): boolean\n",
     "        Swaps x- and y-axis\n",
     "    frame_width/frame_height: int\n",

hvplot/converter.py

@@ -148,6 +148,12 @@ class HoloViewsConverter:
     hover_cols (default=[]): list or str
         Additional columns to add to the hover tool or 'all' which will
         includes all columns (including indexes if use_index is True).
+    hover_tooltips list[str] or list[tuple]:
+        A list of dimensions to be displayed in the hover tooltip.
+    hover_formatters:
+        A dict of formatting options for the hover tooltip.
+    hover_mode (default='mouse'):
+        The hover mode determines how the hover tool is activated.
     invert (default=False): boolean
         Swaps x- and y-axis
     frame_width/frame_height: int
@@ -555,6 +561,9 @@ def __init__(
         logy=None,
         loglog=None,
         hover=None,
+        hover_tooltips=None,
+        hover_formatters=None,
+        hover_mode=None,
         subplots=False,
         label=None,
         invert=False,
@@ -829,6 +838,12 @@ def __init__(
             else:
                 tools.append('hover')
         plot_opts['tools'] = tools
+        if hover_tooltips:
+            plot_opts['hover_tooltips'] = hover_tooltips
+        if hover_formatters:
+            plot_opts['hover_formatters'] = hover_formatters
+        if hover_mode:
+            plot_opts['hover_mode'] = hover_mode
 
         if self.crs and global_extent:
             plot_opts['global_extent'] = global_extent