add support for responsive charts

package.json

@@ -142,6 +142,7 @@
     "karma-jasmine-spec-tags": "^1.0.1",
     "karma-spec-reporter": "0.0.32",
     "karma-verbose-reporter": "0.0.6",
+    "karma-viewport": "^1.0.2",
     "madge": "^3.2.0",
     "minify-stream": "^1.2.0",
     "minimist": "^1.2.0",

src/lib/clear_responsive.js

@@ -0,0 +1,21 @@
+/**
+* Copyright 2012-2018, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+/**
+ * Clear responsive handlers (if any).
+ *
+ * @param {DOM node or object} gd : graph div object
+ */
+module.exports = function clearResponsive(gd) {
+    if(gd._responsiveChartHandler) {
+        window.removeEventListener('resize', gd._responsiveChartHandler);
+        delete gd._responsiveChartHandler;
+    }
+};

src/lib/index.js

@@ -118,6 +118,8 @@ lib.clearThrottle = throttleModule.clear;
 
 lib.getGraphDiv = require('./get_graph_div');
 
+lib.clearResponsive = require('./clear_responsive');
+
 lib.makeTraceGroups = require('./make_trace_groups');
 
 lib._ = require('./localize');

src/plot_api/plot_api.js

@@ -191,6 +191,19 @@ exports.plot = function(gd, data, layout, config) {
         gd.calcdata[i][0].trace = gd._fullData[i];
     }
 
+    // make the figure responsive
+    if(gd._context.responsive) {
+        if(!gd._responsiveChartHandler) {
+            // Keep a reference to the resize handler to purge it down the road
+            gd._responsiveChartHandler = function() {Plots.resize(gd);};
+
+            // Listen to window resize
+            window.addEventListener('resize', gd._responsiveChartHandler);
+        }
+    } else {
+        Lib.clearResponsive(gd);
+    }
+
     /*
      * start async-friendly code - now we're actually drawing things
      */

src/plot_api/plot_config.js

@@ -57,6 +57,9 @@ module.exports = {
      */
     autosizable: false,
 
+    // responsive: determines whether to change the layout size when window is resized
+    responsive: false,
+
     // set the length of the undo/redo queue
     queueLength: 0,
 

src/plots/plots.js

@@ -1536,6 +1536,9 @@ plots.purge = function(gd) {
     // remove any planned throttles
     Lib.clearThrottle();
 
+    // remove responsive handler
+    Lib.clearResponsive(gd);
+
     // data and layout
     delete gd.data;
     delete gd.layout;

test/jasmine/.eslintrc

@@ -3,5 +3,8 @@
   "env": {
     "browser": true,
     "jasmine": true
+  },
+  "globals": {
+    "viewport": true
   }
 }

test/jasmine/karma.conf.js

@@ -137,7 +137,7 @@ func.defaultConfig = {
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['jasmine', 'jasmine-spec-tags', 'browserify'],
+    frameworks: ['jasmine', 'jasmine-spec-tags', 'browserify', 'viewport'],
 
     // list of files / patterns to load in the browser
     //

test/jasmine/tests/config_test.js

@@ -6,6 +6,7 @@ var destroyGraphDiv = require('../assets/destroy_graph_div');
 var click = require('../assets/click');
 var mouseEvent = require('../assets/mouse_event');
 var failTest = require('../assets/fail_test');
+var delay = require('../assets/delay');
 
 describe('config argument', function() {
 
@@ -529,4 +530,108 @@ describe('config argument', function() {
             });
         });
     });
+
+    describe('responsive figure', function() {
+        var gd;
+        var startWidth = 960, startHeight = 400;
+        var newWidth = 400, newHeight = 700;
+        var data = [{x: [1, 2, 3, 4], y: [5, 10, 2, 8]}];
+
+        beforeEach(function() {
+            viewport.set(startWidth, startHeight);
+            gd = createGraphDiv();
+
+            // Make the graph fill the parent
+            gd.style.width = '100%';
+            gd.style.height = '100%';
+        });
+
+        afterEach(function() {
+            Plotly.purge(gd); // Needed to remove all event listeners
+            destroyGraphDiv();
+            viewport.reset();
+        });
+
+        function checkLayoutSize(width, height) {
+            expect(gd._fullLayout.width).toBe(width);
+            expect(gd._fullLayout.height).toBe(height);
+
+            var svg = document.getElementsByClassName('main-svg')[0];
+            expect(+svg.getAttribute('width')).toBe(width);
+            expect(+svg.getAttribute('height')).toBe(height);
+        }
+
+        function testResponsive() {
+            checkLayoutSize(startWidth, startHeight);
+            viewport.set(newWidth, newHeight);
+
+            return Promise.resolve()
+            .then(delay(200))
+            .then(function() {
+                checkLayoutSize(newWidth, newHeight);
+            })
+            .catch(failTest);
+        }
+
+        it('should resize when the viewport width/height changes', function(done) {
+            Plotly.plot(gd, data, {}, {responsive: true})
+            .then(testResponsive)
+            .then(done);
+        });
+
+        it('should still be responsive if the plot is edited', function(done) {
+            Plotly.plot(gd, data, {}, {responsive: true})
+            .then(function() {return Plotly.restyle(gd, 'y[0]', data[0].y[0] + 2);})
+            .then(testResponsive)
+            .then(done);
+        });
+
+        it('should still be responsive if the plot is purged and replotted', function(done) {
+            Plotly.plot(gd, data, {}, {responsive: true})
+            .then(function() {return Plotly.newPlot(gd, data, {}, {responsive: true});})
+            .then(testResponsive)
+            .then(done);
+        });
+
+        it('should only have one resize handler when plotted more than once', function(done) {
+            var cntWindowResize = 0;
+            window.addEventListener('resize', function() {cntWindowResize++;});
+            spyOn(Plotly.Plots, 'resize').and.callThrough();
+
+            Plotly.plot(gd, data, {}, {responsive: true})
+            .then(function() {return Plotly.restyle(gd, 'y[0]', data[0].y[0] + 2);})
+            .then(function() {viewport.set(newWidth, newHeight);})
+            .then(delay(200))
+            // .then(function() {viewport.set(newWidth, 2 * newHeight);}).then(delay(200))
+            .then(function() {
+                expect(cntWindowResize).toBe(1);
+                expect(Plotly.Plots.resize.calls.count()).toBe(1);
+            })
+            .catch(failTest)
+            .then(done);
+        });
+
+        it('should become responsive if configured as such via Plotly.react', function(done) {
+            Plotly.plot(gd, data, {}, {responsive: false})
+            .then(function() {return Plotly.react(gd, data, {}, {responsive: true});})
+            .then(testResponsive)
+            .then(done);
+        });
+
+        it('should stop being responsive if configured as such via Plotly.react', function(done) {
+            Plotly.plot(gd, data, {}, {responsive: true})
+            // Check initial size
+            .then(function() {checkLayoutSize(startWidth, startHeight);})
+            // Turn off responsiveness
+            .then(function() {return Plotly.react(gd, data, {}, {responsive: false});})
+            // Resize viewport
+            .then(function() {viewport.set(newWidth, newHeight);})
+            // Wait for resize to happen (Plotly.resize has an internal timeout)
+            .then(delay(200))
+            // Check that final figure's size hasn't changed
+            .then(function() {checkLayoutSize(startWidth, startHeight);})
+            .catch(failTest)
+            .then(done);
+        });
+    });
 });