Translate cursors to webagg/nbagg on the Python side.

QuLogic · QuLogic · commit 1e3f7f3ea7a7 · 2021-07-07T21:53:13.000-04:00
The JavaScript side is just strings and not some special type, so it's
nicer to translate on the Python side. This way, we don't have to
remember what the Python Enum is on the JS side.
diff --git a/lib/matplotlib/backends/backend_webagg_core.py b/lib/matplotlib/backends/backend_webagg_core.py
@@ -21,7 +21,7 @@
 from PIL import Image
 import tornado
 
-from matplotlib import _api, backend_bases
+from matplotlib import _api, backend_bases, backend_tools
 from matplotlib.backends import backend_agg
 from matplotlib.backend_bases import _Backend
 
@@ -364,7 +364,7 @@ class NavigationToolbar2WebAgg(backend_bases.NavigationToolbar2):
 
     def __init__(self, canvas):
         self.message = ''
-        self.cursor = 0
+        self.cursor = None
         super().__init__(canvas)
 
     def set_message(self, message):
@@ -374,6 +374,13 @@ def set_message(self, message):
 
     def set_cursor(self, cursor):
         if cursor != self.cursor:
+            cursor = {
+                backend_tools.Cursors.HAND: 'pointer',
+                backend_tools.Cursors.POINTER: 'default',
+                backend_tools.Cursors.SELECT_REGION: 'crosshair',
+                backend_tools.Cursors.MOVE: 'move',
+                backend_tools.Cursors.WAIT: 'wait',
+            }[cursor]
             self.canvas.send_event("cursor", cursor=cursor)
         self.cursor = cursor
 
diff --git a/lib/matplotlib/backends/web_backend/js/mpl.js b/lib/matplotlib/backends/web_backend/js/mpl.js
@@ -444,22 +444,7 @@ mpl.figure.prototype.handle_figure_label = function (fig, msg) {
 };
 
 mpl.figure.prototype.handle_cursor = function (fig, msg) {
-    var cursor = msg['cursor'];
-    switch (cursor) {
-        case 0:
-            cursor = 'pointer';
-            break;
-        case 1:
-            cursor = 'default';
-            break;
-        case 2:
-            cursor = 'crosshair';
-            break;
-        case 3:
-            cursor = 'move';
-            break;
-    }
-    fig.rubberband_canvas.style.cursor = cursor;
+    fig.rubberband_canvas.style.cursor = msg['cursor'];
 };
 
 mpl.figure.prototype.handle_message = function (fig, msg) {
