react-native/Libraries/ReactNative/ReactNativeTextComponent.js

80 lines
2.2 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule ReactNativeTextComponent
*/
'use strict';
var ReactNativeTagHandles = require('ReactNativeTagHandles');
var UIManager = require('UIManager');
var assign = require('Object.assign');
var invariant = require('invariant');
var ReactNativeTextComponent = function(props) {
// This constructor and its argument is currently used by mocks.
};
assign(ReactNativeTextComponent.prototype, {
construct: function(text) {
// This is really a ReactText (ReactNode), not a ReactElement
this._currentElement = text;
this._stringText = '' + text;
this._rootNodeID = null;
},
mountComponent: function(rootID, transaction, context) {
invariant(
context.isInAParentText,
'RawText "' + this._stringText + '" must be wrapped in an explicit ' +
'<Text> component.'
);
this._rootNodeID = rootID;
var tag = ReactNativeTagHandles.allocateTag();
var nativeTopRootID = ReactNativeTagHandles.getNativeTopRootIDFromNodeID(rootID);
UIManager.createView(
tag,
'RCTRawText',
nativeTopRootID ? ReactNativeTagHandles.rootNodeIDToTag[nativeTopRootID] : null,
{text: this._stringText}
);
return {
rootNodeID: rootID,
tag: tag,
};
},
receiveComponent: function(nextText, transaction, context) {
if (nextText !== this._currentElement) {
this._currentElement = nextText;
var nextStringText = '' + nextText;
if (nextStringText !== this._stringText) {
this._stringText = nextStringText;
UIManager.updateView(
ReactNativeTagHandles.mostRecentMountedNodeHandleForRootNodeID(
this._rootNodeID
),
'RCTRawText',
{text: this._stringText}
);
}
}
},
unmountComponent: function() {
this._currentElement = null;
this._stringText = null;
this._rootNodeID = null;
}
});
module.exports = ReactNativeTextComponent;