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<h1 class="page-title">Source: svgcanvas/historyrecording.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* HistoryRecordingService component of history.
* @module history
* @license MIT
* @copyright 2016 Flint O'Brien
*/
import {
BatchCommand, MoveElementCommand, InsertElementCommand, RemoveElementCommand,
ChangeElementCommand
} from './history.js';
/**
* History recording service.
*
* A self-contained service interface for recording history. Once injected, no other dependencies
* or globals are required (example: UndoManager, command types, etc.). Easy to mock for unit tests.
* Built on top of history classes in history.js.
*
* There is a simple start/end interface for batch commands.
*
* HistoryRecordingService.NO_HISTORY is a singleton that can be passed in to functions
* that record history. This helps when the caller requires that no history be recorded.
*
* The following will record history: insert, batch, insert.
* @example
* hrService = new HistoryRecordingService(this.undoMgr);
* hrService.insertElement(elem, text); // add simple command to history.
* hrService.startBatchCommand('create two elements');
* hrService.changeElement(elem, attrs, text); // add to batchCommand
* hrService.changeElement(elem, attrs2, text); // add to batchCommand
* hrService.endBatchCommand(); // add batch command with two change commands to history.
* hrService.insertElement(elem, text); // add simple command to history.
*
* @example
* // Note that all functions return this, so commands can be chained, like so:
* hrService
* .startBatchCommand('create two elements')
* .insertElement(elem, text)
* .changeElement(elem, attrs, text)
* .endBatchCommand();
*
* @memberof module:history
*/
class HistoryRecordingService {
/**
* @param {history.UndoManager|null} undoManager - The undo manager.
* A value of `null` is valid for cases where no history recording is required.
* See singleton: {@link module:history.HistoryRecordingService.HistoryRecordingService.NO_HISTORY}
*/
constructor (undoManager) {
this.undoManager_ = undoManager;
this.currentBatchCommand_ = null;
this.batchCommandStack_ = [];
}
/**
* Start a batch command so multiple commands can recorded as a single history command.
* Requires a corresponding call to endBatchCommand. Start and end commands can be nested.
*
* @param {string} text - Optional string describing the batch command.
* @returns {module:history.HistoryRecordingService}
*/
startBatchCommand (text) {
if (!this.undoManager_) { return this; }
this.currentBatchCommand_ = new BatchCommand(text);
this.batchCommandStack_.push(this.currentBatchCommand_);
return this;
}
/**
* End a batch command and add it to the history or a parent batch command.
* @returns {module:history.HistoryRecordingService}
*/
endBatchCommand () {
if (!this.undoManager_) { return this; }
if (this.currentBatchCommand_) {
const batchCommand = this.currentBatchCommand_;
this.batchCommandStack_.pop();
const { length: len } = this.batchCommandStack_;
this.currentBatchCommand_ = len ? this.batchCommandStack_[len - 1] : null;
this.addCommand_(batchCommand);
}
return this;
}
/**
* Add a `MoveElementCommand` to the history or current batch command.
* @param {Element} elem - The DOM element that was moved
* @param {Element} oldNextSibling - The element's next sibling before it was moved
* @param {Element} oldParent - The element's parent before it was moved
* @param {string} [text] - An optional string visible to user related to this change
* @returns {module:history.HistoryRecordingService}
*/
moveElement (elem, oldNextSibling, oldParent, text) {
if (!this.undoManager_) { return this; }
this.addCommand_(new MoveElementCommand(elem, oldNextSibling, oldParent, text));
return this;
}
/**
* Add an `InsertElementCommand` to the history or current batch command.
* @param {Element} elem - The DOM element that was added
* @param {string} [text] - An optional string visible to user related to this change
* @returns {module:history.HistoryRecordingService}
*/
insertElement (elem, text) {
if (!this.undoManager_) { return this; }
this.addCommand_(new InsertElementCommand(elem, text));
return this;
}
/**
* Add a `RemoveElementCommand` to the history or current batch command.
* @param {Element} elem - The DOM element that was removed
* @param {Element} oldNextSibling - The element's next sibling before it was removed
* @param {Element} oldParent - The element's parent before it was removed
* @param {string} [text] - An optional string visible to user related to this change
* @returns {module:history.HistoryRecordingService}
*/
removeElement (elem, oldNextSibling, oldParent, text) {
if (!this.undoManager_) { return this; }
this.addCommand_(new RemoveElementCommand(elem, oldNextSibling, oldParent, text));
return this;
}
/**
* Add a `ChangeElementCommand` to the history or current batch command.
* @param {Element} elem - The DOM element that was changed
* @param {module:history.CommandAttributes} attrs - An object with the attributes to be changed and the values they had *before* the change
* @param {string} [text] - An optional string visible to user related to this change
* @returns {module:history.HistoryRecordingService}
*/
changeElement (elem, attrs, text) {
if (!this.undoManager_) { return this; }
this.addCommand_(new ChangeElementCommand(elem, attrs, text));
return this;
}
/**
* Private function to add a command to the history or current batch command.
* @private
* @param {Command} cmd
* @returns {module:history.HistoryRecordingService|void}
*/
addCommand_ (cmd) {
if (!this.undoManager_) { return this; }
if (this.currentBatchCommand_) {
this.currentBatchCommand_.addSubCommand(cmd);
} else {
this.undoManager_.addCommandToHistory(cmd);
}
return undefined;
}
}
/**
* @memberof module:history.HistoryRecordingService
* @property {module:history.HistoryRecordingService} NO_HISTORY - Singleton that can be passed to functions that record history, but the caller requires that no history be recorded.
*/
HistoryRecordingService.NO_HISTORY = new HistoryRecordingService();
export default HistoryRecordingService;
</code></pre>
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