added keyboardOpeningTime property (#75)

* added keyboardOpeningTime property

* added keyboardOpeningTime in README

Author: markuswind

README.md

@@ -103,8 +103,7 @@ All the `ScrollView`/`ListView` props will be passed.
 | `extraHeight` | `number` | Adds an extra offset when focusing the `TextInput`s. |
 | `extraScrollHeight` | `number` | Adds an extra offset to the keyboard. Useful if you want to stick elements above the keyboard. |
 | `enableResetScrollToCoords` | `boolean` | Lets the user enable or disable automatic resetScrollToCoords. |
-
-### Methods
+| `keyboardOpeningTime` | `number` | Sets the delay time before scrolling to new position, default is 250 |
 
 | **Method** | **Parameter** | **Description** |
 |------------|---------------|-----------------|

lib/KeyboardAwareMixin.js

@@ -14,6 +14,7 @@ const KeyboardAwareMixin = {
   mixins: [TimerMixin],
   propTypes: {
     enableAutoAutomaticScroll: PropTypes.bool,
+    keyboardOpeningTime: PropTypes.number,
     extraHeight: PropTypes.number,
     extraScrollHeight: PropTypes.number,
     enableResetScrollToCoords: PropTypes.bool,
@@ -25,6 +26,7 @@ const KeyboardAwareMixin = {
       extraHeight: _KAM_EXTRA_HEIGHT,
       extraScrollHeight: 0,
       enableResetScrollToCoords: true,
+      keyboardOpeningTime: _KAM_KEYBOARD_OPENING_TIME,
     }
   },
 
@@ -130,26 +132,37 @@ const KeyboardAwareMixin = {
   },
 
   /**
+   * @param keyboardOpeningTime: takes a different keyboardOpeningTime in consideration.
    * @param extraHeight: takes an extra height in consideration.
    */
-  scrollToFocusedInput: function (reactNode: Object, extraHeight: number) {
+  scrollToFocusedInput: function (reactNode: Object, extraHeight: number, keyboardOpeningTime: number) {
     if (extraHeight === undefined) {
         extraHeight = this.props.extraHeight;
     }
+
+    if (keyboardOpeningTime === undefined) {
+        keyboardOpeningTime = this.props.keyboardOpeningTime;
+    }
+
     this.setTimeout(() => {
       const responder = this.getScrollResponder();
       responder && responder.scrollResponderScrollNativeHandleToKeyboard(
         reactNode, extraHeight, true
       )
-    }, _KAM_KEYBOARD_OPENING_TIME)
+    }, keyboardOpeningTime)
   },
 
-  scrollToFocusedInputWithNodeHandle: function (nodeID: number, extraHeight: number) {
+  scrollToFocusedInputWithNodeHandle: function (nodeID: number, extraHeight: number, keyboardOpeningTime: number) {
     if (extraHeight === undefined) {
         extraHeight = this.props.extraHeight;
     }
+
+    if (keyboardOpeningTime === undefined) {
+        keyboardOpeningTime = this.props.keyboardOpeningTime;
+    }
+
     const reactNode = ReactNative.findNodeHandle(nodeID)
-    this.scrollToFocusedInput(reactNode, extraHeight + this.props.extraScrollHeight)
+    this.scrollToFocusedInput(reactNode, extraHeight + this.props.extraScrollHeight, keyboardOpeningTime)
   },
 
   position: {x: 0, y: 0},