Factor EditableTextContainer out of ChangeDisplayName

Take the non-displayname-specific bits out of ChangeDisplayName into a new
EditableTextContainer, so that we can reuse the logic elsewhere.

src/components/views/elements/EditableTextContainer.js

@@ -0,0 +1,147 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import sdk from '../../../index';
+import q from 'q';
+
+/**
+ * A component which wraps an EditableText, with a spinner while updates take
+ * place.
+ *
+ * Parent components should supply an 'onSubmit' callback which returns a
+ * promise; a spinner is shown until the promise resolves.
+ *
+ * The parent can also supply a 'getIntialValue' callback, which works in a
+ * similarly asynchronous way. If this is not provided, the initial value is
+ * taken from the 'initialValue' property.
+ */
+export default class EditableTextContainer extends React.Component {
+    constructor(props, context) {
+        super(props, context);
+
+        this._unmounted = false;
+        this.state = {
+            busy: false,
+            errorString: null,
+            value: props.initialValue,
+        };
+        this._onValueChanged=this._onValueChanged.bind(this);
+    }
+
+    componentWillMount() {
+        if (this.props.getInitialValue === undefined) {
+            // use whatever was given in the initialValue property.
+            return;
+        }
+
+        this.setState({busy: true});
+
+        this.props.getInitialValue().done(
+            (result) => {
+                if (this._unmounted) { return; }
+                this.setState({
+                    busy: false,
+                    value: result,
+                });
+            },
+            (error) => {
+                if (this._unmounted) { return; }
+                this.setState({
+                    errorString: error.toString(),
+                    busy: false,
+                });
+            }
+        );
+    }
+
+    componentWillUnmount() {
+        this._unmounted = true;
+    }
+
+    _onValueChanged(value, shouldSubmit) {
+        if (!shouldSubmit) {
+            return;
+        }
+
+        this.setState({
+            busy: true,
+            errorString: null,
+        });
+
+        this.props.onSubmit(value).done(
+            () => {
+                if (this._unmounted) { return; }
+                this.setState({
+                    busy: false,
+                    value: value,
+                });
+            },
+            (error) => {
+                if (this._unmounted) { return; }
+                this.setState({
+                    errorString: error.toString(),
+                    busy: false,
+                });
+            }
+        );
+    }
+
+    render() {
+        if (this.state.busy) {
+            var Loader = sdk.getComponent("elements.Spinner");
+            return (
+                <Loader />
+            );
+        } else if (this.state.errorString) {
+            return (
+                <div className="error">{this.state.errorString}</div>
+            );
+        } else {
+            var EditableText = sdk.getComponent('elements.EditableText');
+            return (
+                <EditableText initialValue={this.state.value}
+                    placeholder={this.props.placeholder}
+                    onValueChanged={this._onValueChanged}
+                />
+            );
+        }
+    }
+
+}
+
+EditableTextContainer.propTypes = {
+    /* callback to retrieve the initial value. */
+    getInitialValue: React.PropTypes.func,
+
+    /* initial value; used if getInitialValue is not given */
+    initialValue: React.PropTypes.string,
+
+    /* placeholder text to use when the value is empty (and not being
+     * edited) */
+    placeholder: React.PropTypes.string,
+
+    /* callback to update the value. Called with a single argument: the new
+     * value. */
+    onSubmit: React.PropTypes.func,
+};
+
+
+EditableTextContainer.defaultProps = {
+    initialValue: "",
+    placeholder: "",
+    onSubmit: function(v) {return q(); },
+};