NetInfo: Cleaned up code and examples

Reviewed By: andreicoman11

Differential Revision: D2723578

fb-gh-sync-id: b7bb9ce69f24ff5dcf38409de92d57f53da003fa

Examples/UIExplorer/NetInfoExample.js

@@ -0,0 +1,182 @@
+/**
+ * The examples provided by Facebook are for non-commercial testing and
+ * evaluation purposes only.
+ *
+ * Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * @flow
+ */
+'use strict';
+
+const React = require('react-native');
+const {
+  NetInfo,
+  Text,
+  View,
+  TouchableWithoutFeedback,
+} = React;
+
+const ConnectionInfoSubscription = React.createClass({
+  getInitialState() {
+    return {
+      connectionInfoHistory: [],
+    };
+  },
+  componentDidMount: function() {
+    NetInfo.addEventListener(
+        'change',
+        this._handleConnectionInfoChange
+    );
+  },
+  componentWillUnmount: function() {
+    NetInfo.removeEventListener(
+        'change',
+        this._handleConnectionInfoChange
+    );
+  },
+  _handleConnectionInfoChange: function(connectionInfo) {
+    const connectionInfoHistory = this.state.connectionInfoHistory.slice();
+    connectionInfoHistory.push(connectionInfo);
+    this.setState({
+      connectionInfoHistory,
+    });
+  },
+  render() {
+    return (
+        <View>
+          <Text>{JSON.stringify(this.state.connectionInfoHistory)}</Text>
+        </View>
+    );
+  }
+});
+
+const ConnectionInfoCurrent = React.createClass({
+  getInitialState() {
+    return {
+      connectionInfo: null,
+    };
+  },
+  componentDidMount: function() {
+    NetInfo.addEventListener(
+        'change',
+        this._handleConnectionInfoChange
+    );
+    NetInfo.fetch().done(
+        (connectionInfo) => { this.setState({connectionInfo}); }
+    );
+  },
+  componentWillUnmount: function() {
+    NetInfo.removeEventListener(
+        'change',
+        this._handleConnectionInfoChange
+    );
+  },
+  _handleConnectionInfoChange: function(connectionInfo) {
+    this.setState({
+      connectionInfo,
+    });
+  },
+  render() {
+    return (
+        <View>
+          <Text>{this.state.connectionInfo}</Text>
+        </View>
+    );
+  }
+});
+
+const IsConnected = React.createClass({
+  getInitialState() {
+    return {
+      isConnected: null,
+    };
+  },
+  componentDidMount: function() {
+    NetInfo.isConnected.addEventListener(
+        'change',
+        this._handleConnectivityChange
+    );
+    NetInfo.isConnected.fetch().done(
+        (isConnected) => { this.setState({isConnected}); }
+    );
+  },
+  componentWillUnmount: function() {
+    NetInfo.isConnected.removeEventListener(
+        'change',
+        this._handleConnectivityChange
+    );
+  },
+  _handleConnectivityChange: function(isConnected) {
+    this.setState({
+      isConnected,
+    });
+  },
+  render() {
+    return (
+        <View>
+          <Text>{this.state.isConnected ? 'Online' : 'Offline'}</Text>
+        </View>
+    );
+  }
+});
+
+const IsConnectionExpensive = React.createClass({
+  getInitialState() {
+    return {
+      isConnectionExpensive: null,
+    };
+  },
+  _checkIfExpensive() {
+    NetInfo.isConnectionExpensive(
+        (isConnectionExpensive) => { this.setState({isConnectionExpensive}); }
+    );
+  },
+  render() {
+    return (
+        <View>
+          <TouchableWithoutFeedback onPress={this._checkIfExpensive}>
+            <View>
+              <Text>Click to see if connection is expensive:
+                {this.state.isConnectionExpensive === true ? 'Expensive' :
+                this.state.isConnectionExpensive === false ? 'Not expensive'
+                : 'Unknown'}
+              </Text>
+            </View>
+          </TouchableWithoutFeedback>
+        </View>
+    );
+  }
+});
+
+exports.title = 'NetInfo';
+exports.description = 'Monitor network status';
+exports.examples = [
+  {
+    title: 'NetInfo.isConnected',
+    description: 'Asynchronously load and observe connectivity',
+    render(): ReactElement { return <IsConnected />; }
+  },
+  {
+    title: 'NetInfo.update',
+    description: 'Asynchronously load and observe connectionInfo',
+    render(): ReactElement { return <ConnectionInfoCurrent />; }
+  },
+  {
+    title: 'NetInfo.updateHistory',
+    description: 'Observed updates to connectionInfo',
+    render(): ReactElement { return <ConnectionInfoSubscription />; }
+  },
+  {
+    platform: 'android',
+    title: 'NetInfo.isConnectionExpensive (Android)',
+    description: 'Asycnronously check isConnectionExpensive',
+    render(): ReactElement { return <IsConnectionExpensive />; }
+  },
+];