[TextInput] returnKeyType, enablesReturnKeyAutomatically, secureTextEntry, more keyboardTypes

Summary:
This diff completes adding support for the following UITextField properties:

- returnKeyType: what the return key on the keyboard says
- enablesReturnKeyAutomatically: the return key is disabled iff there is no text entered. This too could be implemented in React but it feels better in UIKit right now because it is handled synchronously.
- secureTextEntry: obscure passwords
- keyboardType: added all the keyboard types, they are useful in different scenarios

There were varying degrees of support for these properties so it looks like this diff continues some unfinished work. I also updated the keyboardType enum to use native constants instead of strings like the other properties here.

Added examples to the UIExplorer.
Closes https://github.com/facebook/react-native/pull/265
Github Author: James Ide <ide@jameside.com>

Test Plan: Imported from GitHub, without a `Test Plan:` line.

Libraries/Components/TextInput/TextInput.js

@@ -32,6 +32,8 @@ var invariant = require('invariant');
 var merge = require('merge');
 
 var autoCapitalizeConsts = RCTUIManager.UIText.AutocapitalizationType;
+var keyboardTypeConsts = RCTUIManager.UIKeyboardType;
+var returnKeyTypeConsts = RCTUIManager.UIReturnKeyType;
 
 var RCTTextViewAttributes = merge(ReactIOSViewAttributes.UIView, {
   autoCorrect: true,
@@ -43,6 +45,9 @@ var RCTTextViewAttributes = merge(ReactIOSViewAttributes.UIView, {
   fontStyle: true,
   fontWeight: true,
   keyboardType: true,
+  returnKeyType: true,
+  enablesReturnKeyAutomatically: true,
+  secureTextEntry: true,
   mostRecentEventCounter: true,
   placeholder: true,
   placeholderTextColor: true,
@@ -82,6 +87,10 @@ var AndroidTextInput = createReactIOSNativeComponentClass({
   uiViewClassName: 'AndroidTextInput',
 });
 
+var crossPlatformKeyboardTypeMap = {
+  'numeric': 'decimal-pad',
+};
+
 type DefaultProps = {
   bufferDelay: number;
 };
@@ -154,8 +163,47 @@ var TextInput = React.createClass({
      */
     keyboardType: PropTypes.oneOf([
       'default',
+      // iOS
+      'ascii-capable',
+      'numbers-and-punctuation',
+      'url',
+      'number-pad',
+      'phone-pad',
+      'name-phone-pad',
+      'email-address',
+      'decimal-pad',
+      'twitter',
+      'web-search',
+      // Cross-platform
       'numeric',
     ]),
+    /**
+     * Determines how the return key should look.
+     */
+    returnKeyType: PropTypes.oneOf([
+      'default',
+      'go',
+      'google',
+      'join',
+      'next',
+      'route',
+      'search',
+      'send',
+      'yahoo',
+      'done',
+      'emergency-call',
+    ]),
+    /**
+     * If true, the keyboard disables the return key when there is no text and
+     * automatically enables it when there is text. Default value is false.
+     */
+    enablesReturnKeyAutomatically: PropTypes.bool,
+
+    /**
+     * If true, the text input obscures the text entered so that sensitive text
+     * like passwords stay secure. Default value is false.
+     */
+    secureTextEntry: PropTypes.bool,
     /**
      * If true, the text input can be multiple lines. Default value is false.
      */
@@ -351,6 +399,12 @@ var TextInput = React.createClass({
     var autoCapitalize = autoCapitalizeConsts[this.props.autoCapitalize];
     var clearButtonMode = RCTUIManager.UITextField.clearButtonMode[this.props.clearButtonMode];
 
+    var keyboardType = keyboardTypeConsts[
+      crossPlatformKeyboardTypeMap[this.props.keyboardType] ||
+      this.props.keyboardType
+    ];
+    var returnKeyType = returnKeyTypeConsts[this.props.returnKeyType];
+
     if (!this.props.multiline) {
       for (var propKey in onlyMultiline) {
         if (this.props[propKey]) {
@@ -364,7 +418,10 @@ var TextInput = React.createClass({
           ref="input"
           style={[styles.input, this.props.style]}
           enabled={this.props.editable}
-          keyboardType={this.props.keyboardType}
+          keyboardType={keyboardType}
+          returnKeyType={returnKeyType}
+          enablesReturnKeyAutomatically={this.props.enablesReturnKeyAutomatically}
+          secureTextEntry={this.props.secureTextEntry}
           onFocus={this._onFocus}
           onBlur={this._onBlur}
           onChange={this._onChange}
@@ -406,6 +463,10 @@ var TextInput = React.createClass({
           children={children}
           mostRecentEventCounter={this.state.mostRecentEventCounter}
           editable={this.props.editable}
+          keyboardType={keyboardType}
+          returnKeyType={returnKeyType}
+          enablesReturnKeyAutomatically={this.props.enablesReturnKeyAutomatically}
+          secureTextEntry={this.props.secureTextEntry}
           onFocus={this._onFocus}
           onBlur={this._onBlur}
           onChange={this._onChange}