blob: e5c58e0ba21b8809bf777cfaf4fd82e2422bc155 [file] [log] [blame]
/**
* @license
* Copyright (C) 2016 The Android Open Source Project
*
* 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.
*/
(function() {
'use strict';
const RESTORED_MESSAGE = 'Content restored from a previous edit.';
const STORAGE_DEBOUNCE_INTERVAL_MS = 400;
Polymer({
is: 'gr-editable-content',
/**
* Fired when the save button is pressed.
*
* @event editable-content-save
*/
/**
* Fired when the cancel button is pressed.
*
* @event editable-content-cancel
*/
/**
* Fired when content is restored from storage.
*
* @event show-alert
*/
properties: {
content: {
notify: true,
type: String,
},
disabled: {
reflectToAttribute: true,
type: Boolean,
value: false,
},
editing: {
observer: '_editingChanged',
type: Boolean,
value: false,
},
removeZeroWidthSpace: Boolean,
// If no storage key is provided, content is not stored.
storageKey: String,
_saveDisabled: {
computed: '_computeSaveDisabled(disabled, content, _newContent)',
type: Boolean,
value: true,
},
_newContent: {
type: String,
observer: '_newContentChanged',
},
},
focusTextarea() {
this.$$('iron-autogrow-textarea').textarea.focus();
},
_newContentChanged(newContent, oldContent) {
if (!this.storageKey) { return; }
this.debounce('store', () => {
if (newContent.length) {
this.$.storage.setEditableContentItem(this.storageKey, newContent);
} else {
// This does not really happen, because we don't clear newContent
// after saving (see below). So this only occurs when the user clears
// all the content in the editable textarea. But <gr-storage> cleans
// up itself after one day, so we are not so concerned about leaving
// some garbage behind.
this.$.storage.eraseEditableContentItem(this.storageKey);
}
}, STORAGE_DEBOUNCE_INTERVAL_MS);
},
_editingChanged(editing) {
// This method is for initializing _newContent when you start editing.
// Restoring content from local storage is not perfect and has
// some issues:
//
// 1. When you start editing in multiple tabs, then we are vulnerable to
// race conditions between the tabs.
// 2. The stored content is keyed by revision, so when you upload a new
// patchset and click "reload" and then click "cancel" on the content-
// editable, then you won't be able to recover the content anymore.
//
// Because of these issues we believe that it is better to only recover
// content from local storage when you enter editing mode for the first
// time. Otherwise it is better to just keep the last editing state from
// the same session.
if (!editing || this._newContent) {
return;
}
let content;
if (this.storageKey) {
const storedContent =
this.$.storage.getEditableContentItem(this.storageKey);
if (storedContent && storedContent.message) {
content = storedContent.message;
this.dispatchEvent(new CustomEvent('show-alert',
{detail: {message: RESTORED_MESSAGE}, bubbles: true}));
}
}
if (!content) {
content = this.content || '';
}
// TODO(wyatta) switch linkify sequence, see issue 5526.
this._newContent = this.removeZeroWidthSpace ?
content.replace(/^R=\u200B/gm, 'R=') :
content;
},
_computeSaveDisabled(disabled, content, newContent) {
return disabled || !newContent || content === newContent;
},
_handleSave(e) {
e.preventDefault();
this.fire('editable-content-save', {content: this._newContent});
// It would be nice, if we would set this._newContent = undefined here,
// but we can only do that when we are sure that the save operation has
// succeeded.
},
_handleCancel(e) {
e.preventDefault();
this.editing = false;
this.fire('editable-content-cancel');
},
});
})();