[Touchable] Expose the press-retention offset as a prop

The press-retention offset defines a rect around a touchable component in which the press is retained. Easiest way to see this is to touch a button in a real navigation bar and slide your finger out of the range and back in. This diff exposes the offset as a prop (I thought pressRetentionOffset was a more informative name than pressRectOffset).

Libraries/Components/Touchable/TouchableBounce.js

@@ -12,24 +12,19 @@
 'use strict';
 
 var Animated = require('Animated');
+var EdgeInsetsPropType = require('EdgeInsetsPropType');
 var NativeMethodsMixin = require('NativeMethodsMixin');
 var React = require('React');
 var Touchable = require('Touchable');
 
-var merge = require('merge');
-
 type Event = Object;
+
 type State = {
   animationID: ?number;
 };
 
-/**
- * When the scroll view is disabled, this defines how far your touch may move
- * off of the button, before deactivating the button. Once deactivated, try
- * moving it back and you'll see that the button is once again reactivated!
- * Move it back and forth several times while the scroll view is disabled.
- */
-var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+var PRESS_RETENTION_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+
 /**
  * Example of using the `TouchableMixin` to play well with other responder
  * locking views including `ScrollView`. `TouchableMixin` provides touchable
@@ -50,6 +45,14 @@ var TouchableBounce = React.createClass({
     onPressWithCompletion: React.PropTypes.func,
     // the function passed is called after the animation is complete
     onPressAnimationComplete: React.PropTypes.func,
+    /**
+     * When the scroll view is disabled, this defines how far your touch may
+     * move off of the button, before deactivating the button. Once deactivated,
+     * try moving it back and you'll see that the button is once again
+     * reactivated! Move it back and forth several times while the scroll view
+     * is disabled. Ensure you pass in a constant to reduce memory allocations.
+     */
+    pressRetentionOffset: EdgeInsetsPropType,
   },
 
   getInitialState: function(): State {
@@ -100,8 +103,8 @@ var TouchableBounce = React.createClass({
     this.props.onPress && this.props.onPress(e);
   },
 
-  touchableGetPressRectOffset: function(): typeof PRESS_RECT_OFFSET {
-    return PRESS_RECT_OFFSET;   // Always make sure to predeclare a constant!
+  touchableGetPressRectOffset: function(): typeof PRESS_RETENTION_OFFSET {
+    return this.props.pressRetentionOffset || PRESS_RETENTION_OFFSET;
   },
 
   touchableGetHighlightDelayMS: function(): number {

Libraries/Components/Touchable/TouchableHighlight.js

@@ -34,6 +34,8 @@ var DEFAULT_PROPS = {
   underlayColor: 'black',
 };
 
+var PRESS_RETENTION_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+
 /**
  * A wrapper for making views respond properly to touches.
  * On press down, the opacity of the wrapped view is decreased, which allows
@@ -169,7 +171,7 @@ var TouchableHighlight = React.createClass({
   },
 
   touchableGetPressRectOffset: function() {
-    return PRESS_RECT_OFFSET;   // Always make sure to predeclare a constant!
+    return this.props.pressRetentionOffset || PRESS_RETENTION_OFFSET;
   },
 
   touchableGetHighlightDelayMS: function() {
@@ -234,7 +236,6 @@ var TouchableHighlight = React.createClass({
   }
 });
 
-var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
 var CHILD_REF = keyOf({childRef: null});
 var UNDERLAY_REF = keyOf({underlayRef: null});
 var INACTIVE_CHILD_PROPS = {

Libraries/Components/Touchable/TouchableNativeFeedback.android.js

@@ -47,7 +47,7 @@ var TouchableView = createReactNativeComponentClass({
   uiViewClassName: 'RCTView',
 });
 
-var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+var PRESS_RETENTION_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
 
 /**
  * A wrapper for making views respond properly to touches (Android only).
@@ -161,7 +161,8 @@ var TouchableNativeFeedback = React.createClass({
   },
 
   touchableGetPressRectOffset: function() {
-    return PRESS_RECT_OFFSET;   // Always make sure to predeclare a constant!
+    // Always make sure to predeclare a constant!
+    return this.props.pressRetentionOffset || PRESS_RETENTION_OFFSET;
   },
 
   touchableGetHighlightDelayMS: function() {

Libraries/Components/Touchable/TouchableOpacity.js

@@ -21,10 +21,11 @@ var TouchableWithoutFeedback = require('TouchableWithoutFeedback');
 
 var ensurePositiveDelayProps = require('ensurePositiveDelayProps');
 var flattenStyle = require('flattenStyle');
-var keyOf = require('keyOf');
 
 type Event = Object;
 
+var PRESS_RETENTION_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+
 /**
  * A wrapper for making views respond properly to touches.
  * On press down, the opacity of the wrapped view is decreased, dimming it.
@@ -46,7 +47,6 @@ type Event = Object;
  * },
  * ```
  */
-
 var TouchableOpacity = React.createClass({
   mixins: [TimerMixin, Touchable.Mixin, NativeMethodsMixin],
 
@@ -120,7 +120,7 @@ var TouchableOpacity = React.createClass({
   },
 
   touchableGetPressRectOffset: function() {
-    return PRESS_RECT_OFFSET;   // Always make sure to predeclare a constant!
+    return this.props.pressRetentionOffset || PRESS_RETENTION_OFFSET;
   },
 
   touchableGetHighlightDelayMS: function() {
@@ -170,13 +170,4 @@ var TouchableOpacity = React.createClass({
   },
 });
 
-/**
- * When the scroll view is disabled, this defines how far your touch may move
- * off of the button, before deactivating the button. Once deactivated, try
- * moving it back and you'll see that the button is once again reactivated!
- * Move it back and forth several times while the scroll view is disabled.
- */
-var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
-
-
 module.exports = TouchableOpacity;

Libraries/Components/Touchable/TouchableWithoutFeedback.js

@@ -1,3 +1,4 @@
+
 /**
  * Copyright (c) 2015-present, Facebook, Inc.
  * All rights reserved.
@@ -11,22 +12,18 @@
  */
 'use strict';
 
+var EdgeInsetsPropType = require('EdgeInsetsPropType');
 var React = require('React');
 var TimerMixin = require('react-timer-mixin');
 var Touchable = require('Touchable');
 var View = require('View');
 var ensurePositiveDelayProps = require('ensurePositiveDelayProps');
+var invariant = require('invariant');
 var onlyChild = require('onlyChild');
 
 type Event = Object;
 
-/**
- * When the scroll view is disabled, this defines how far your touch may move
- * off of the button, before deactivating the button. Once deactivated, try
- * moving it back and you'll see that the button is once again reactivated!
- * Move it back and forth several times while the scroll view is disabled.
- */
-var PRESS_RECT_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
+var PRESS_RETENTION_OFFSET = {top: 20, left: 20, right: 20, bottom: 30};
 
 /**
  * Do not use unless you have a very good reason. All the elements that
@@ -71,6 +68,14 @@ var TouchableWithoutFeedback = React.createClass({
      * Delay in ms, from onPressIn, before onLongPress is called.
      */
     delayLongPress: React.PropTypes.number,
+    /**
+     * When the scroll view is disabled, this defines how far your touch may
+     * move off of the button, before deactivating the button. Once deactivated,
+     * try moving it back and you'll see that the button is once again
+     * reactivated! Move it back and forth several times while the scroll view
+     * is disabled. Ensure you pass in a constant to reduce memory allocations.
+     */
+    pressRetentionOffset: EdgeInsetsPropType,
   },
 
   getInitialState: function() {
@@ -105,8 +110,8 @@ var TouchableWithoutFeedback = React.createClass({
     this.props.onLongPress && this.props.onLongPress(e);
   },
 
-  touchableGetPressRectOffset: function(): typeof PRESS_RECT_OFFSET {
-    return PRESS_RECT_OFFSET;   // Always make sure to predeclare a constant!
+  touchableGetPressRectOffset: function(): typeof PRESS_RETENTION_OFFSET {
+    return this.props.pressRetentionOffset || PRESS_RETENTION_OFFSET;
   },
 
   touchableGetHighlightDelayMS: function(): number {