add buttonstoadd to layout.modebar

Author: archmoj

src/components/modebar/attributes.js

@@ -37,5 +37,28 @@ module.exports = {
                 'root level and inside subplots. Defaults to `layout.uirevision`.'
             ].join(' ')
         },
+        buttonstoadd: {
+            valType: 'flaglist',
+            flags: [
+                'v1hovermode',
+                'hoverclosest',
+                'hovercompare',
+                'togglehover',
+                'togglespikelines',
+                'drawclosedpath',
+                'drawopenpath',
+                'drawline',
+                'drawrect',
+                'drawcircle',
+                'eraseshape',
+            ],
+            dflt: '',
+            editType: 'modebar',
+            description: [
+                'Determines which predefined modebar buttons to add.',
+                'Please note that these buttons will only be shown if they are compatible',
+                'with all trace types used in a graph.'
+            ].join(' ')
+        }
     }
 };

src/components/modebar/defaults.js

@@ -15,4 +15,5 @@ module.exports = function supplyLayoutDefaults(layoutIn, layoutOut) {
     coerce('modebar.color', Color.addOpacity(defaultColor, 0.3));
     coerce('modebar.activecolor', Color.addOpacity(defaultColor, 0.7));
     coerce('modebar.uirevision', layoutOut.uirevision);
+    coerce('modebar.buttonstoadd');
 };

src/components/modebar/manage.js

@@ -72,8 +72,9 @@ function getButtonGroups(gd) {
     var fullLayout = gd._fullLayout;
     var fullData = gd._fullData;
     var context = gd._context;
+    var layoutButtonsToAdd = fullLayout.modebar.buttonstoadd.split('+');
+    var buttonsToAdd = context.modeBarButtonsToAdd.concat(layoutButtonsToAdd);
     var buttonsToRemove = context.modeBarButtonsToRemove;
-    var buttonsToAdd = context.modeBarButtonsToAdd;
 
     var hasCartesian = fullLayout._has('cartesian');
     var hasGL3D = fullLayout._has('gl3d');

test/jasmine/tests/modebar_test.js

@@ -42,6 +42,7 @@ describe('ModeBar', function() {
                 _has: Plots._hasPlotType,
                 _subplots: {xaxis: xaxes || [], yaxis: yaxes || []},
                 modebar: {
+                    buttonstoadd: '',
                     orientation: 'h',
                     bgcolor: 'rgba(255,255,255,0.7)',
                     color: 'rgba(0, 31, 95, 0.3)',