[add] TextInputState

src/components/TextInput/TextInputState.js

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2016-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import UIManager from '../../apis/UIManager'
+
+/**
+ * This class is responsible for coordinating the "focused"
+ * state for TextInputs. All calls relating to the keyboard
+ * should be funneled through here
+ */
+const TextInputState = {
+   /**
+   * Internal state
+   */
+  _currentlyFocusedNode: (null: ?Object),
+
+  /**
+   * Returns the ID of the currently focused text field, if one exists
+   * If no text field is focused it returns null
+   */
+  currentlyFocusedField(): ?Object {
+    return this._currentlyFocusedNode
+  },
+
+  /**
+   * @param {Object} TextInputID id of the text field to focus
+   * Focuses the specified text field
+   * noop if the text field was already focused
+   */
+  focusTextInput(textFieldNode: ?Object) {
+    if (this._currentlyFocusedNode !== textFieldNode && textFieldNode !== null) {
+      this._currentlyFocusedNode = textFieldNode
+      UIManager.focus(textFieldNode)
+    }
+  },
+
+  /**
+   * @param {Object} textFieldNode id of the text field to focus
+   * Unfocuses the specified text field
+   * noop if it wasn't focused
+   */
+  blurTextInput(textFieldNode: ?Object) {
+    if (this._currentlyFocusedNode === textFieldNode && textFieldNode !== null) {
+      this._currentlyFocusedNode = null
+      UIManager.blur(textFieldNode)
+    }
+  }
+}
+
+module.exports = TextInputState