fix(interaction): Prioritize mouse input (#280)

Determine by userAgent and prioritize mouse input type for non-mobile environment.

Fix #92 
Close #280

spec/interactions/interaction-spec.js

@@ -30,6 +30,10 @@ describe("INTERACTION", () => {
 				};
 			});
 
+			it("inputType should be 'mouse", () => {
+				expect(chart.internal.inputType).to.be.equal("mouse");
+			});
+
 			it("should have 4 event rects properly", () => {
 				const lefts = [69, 130, 198, 403];
 				const widths = [61, 68, 205, 197.5];
@@ -406,7 +410,7 @@ describe("INTERACTION", () => {
 				});
 			});
 
-			it("set inputType.mouse=false", () => {
+			it("set option inputType.mouse=false", () => {
 				args.interaction.inputType.mouse = false;
 			});
 
@@ -528,6 +532,10 @@ describe("INTERACTION", () => {
 				};
 			});
 
+			it("inputType should be 'touch", () => {
+				expect(chart.internal.inputType).to.be.equal("touch");
+			});
+
 			it("showed each data points tooltip?", done => {
 				util.simulator(chart.internal.svg.node(), {
 					pos: [250,150],

src/internals/ChartInternal.js

@@ -1258,15 +1258,16 @@ export default class ChartInternal {
 	convertInputType() {
 		const $$ = this;
 		const config = $$.config;
-		const hasMouse = config.interaction_inputType_mouse ? ("onmouseover" in window) : false;
+		const isMobile = $$.isMobile();
+		const hasMouse = config.interaction_inputType_mouse && !isMobile ? ("onmouseover" in window) : false;
 		let hasTouch = false;
 
-		if (notEmpty(config.interaction_inputType_touch)) {
+		if (config.interaction_inputType_touch) {
 			// Ref: https://github.com/Modernizr/Modernizr/blob/master/feature-detects/touchevents.js
 			// On IE11 with IE9 emulation mode, ('ontouchstart' in window) is returning true
 			hasTouch = ("ontouchmove" in window) || (window.DocumentTouch && document instanceof window.DocumentTouch);
 		}
 
-		return (hasTouch && "touch") || (hasMouse && "mouse") || null;
+		return (hasMouse && "mouse") || (hasTouch && "touch") || null;
 	}
 }

src/internals/ua.js

@@ -5,16 +5,19 @@
 import ChartInternal from "./ChartInternal";
 import {extend} from "./util";
 
+const ua = window.navigator.userAgent;
+
 extend(ChartInternal.prototype, {
 	isSafari() {
-		const ua = window.navigator.userAgent;
-
-		return ua.indexOf("Safari") >= 0 &&
-			ua.indexOf("Chrome") < 0;
+		return ua.indexOf("Safari") > -1 && !this.isChrome();
 	},
 
 	isChrome() {
-		return window.navigator.userAgent
-			.indexOf("Chrome") >= 0;
+		return ua.indexOf("Chrome") > -1;
+	},
+
+	isMobile() {
+		// https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent
+		return ua.indexOf("Mobi") > -1;
 	}
 });