modebar: do not display hover buttons when all traces are "noHover"

Author: antoinerg

src/components/modebar/manage.js

@@ -146,6 +146,9 @@ function getButtonGroups(gd, buttonsToRemove, buttonsToAdd, showSendToCloud) {
     if(hasCartesian) {
         hoverGroup = ['toggleSpikelines', 'hoverClosestCartesian', 'hoverCompareCartesian'];
     }
+    if(hasNoHover(fullLayout)) {
+        hoverGroup = [];
+    }
 
     if((hasCartesian || hasGL2D) && !allAxesFixed) {
         zoomGroup = ['zoomIn2d', 'zoomOut2d', 'autoScale2d'];
@@ -216,6 +219,14 @@ function isSelectable(fullData) {
     return selectable;
 }
 
+// check whether all plot modules in fullLayout are noHover
+function hasNoHover(fullLayout) {
+    for(var i = 0; i < fullLayout._basePlotModules.length; i++) {
+        if(!Registry.traceIs(fullLayout._basePlotModules[i].name, 'noHover')) return false;
+    }
+    return true;
+}
+
 function appendButtonsToGroups(groups, buttons) {
     if(buttons.length) {
         if(Array.isArray(buttons[0])) {

test/jasmine/tests/modebar_test.js

@@ -41,6 +41,7 @@ describe('ModeBar', function() {
                 _modebardiv: d3.select(getMockModeBarTree()),
                 _has: Plots._hasPlotType,
                 _subplots: {xaxis: xaxes || [], yaxis: yaxes || []},
+                _basePlotModules: [],
                 modebar: {
                     orientation: 'h',
                     bgcolor: 'rgba(255,255,255,0.7)',
@@ -719,6 +720,35 @@ describe('ModeBar', function() {
             checkButtons(modeBar, buttons, 1);
         });
 
+        it('creates mode bar without hover button when all traces are noHover', function() {
+            var buttons = getButtons([
+                ['toImage']
+            ]);
+
+            var gd = getMockGraphInfo();
+            gd._fullLayout._basePlotModules = [{ name: 'indicator' }];
+
+            manageModeBar(gd);
+            var modeBar = gd._fullLayout._modeBar;
+
+            checkButtons(modeBar, buttons, 1);
+        });
+
+        it('creates mode bar with hover button even in the presence of one noHover trace', function() {
+            var buttons = getButtons([
+                ['toImage'],
+                ['hoverClosestPie']
+            ]);
+
+            var gd = getMockGraphInfo();
+            gd._fullLayout._basePlotModules = [{ name: 'indicator' }, {name: 'pie'}];
+
+            manageModeBar(gd);
+            var modeBar = gd._fullLayout._modeBar;
+
+            checkButtons(modeBar, buttons, 1);
+        });
+
         it('throws an error if modeBarButtonsToRemove isn\'t an array', function() {
             var gd = getMockGraphInfo();
             gd._context.modeBarButtonsToRemove = 'not gonna work';