markgojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
114 lines (109 loc) • 4.15 kB
JavaScript
"use strict";
/*
* Copyright (C) 1998-2019 by Northwoods Software Corporation. All Rights Reserved.
*/
/**
* @constructor
* @extends CommandHandler
* @class
* This CommandHandler class uses localStorage as the repository for the clipboard,
* rather than an in-memory global variable.
* It requires that the {@link Diagram#model} be serializable and deserializable using {@link Model#toJson} and {@link Model.fromJson}.
* <p>
* The {@link #copyToClipboard} and {@link #pasteFromClipboard} functions fall back to using the standard definitions
* if there are any errors calling <code>Storage.getItem</code> or <code>Storage.setItem</code>.
* <p>
* Typical usage:
* <pre>
* $(go.Diagram, "myDiagramDiv",
* {
* commandHandler: $(LocalStorageCommandHandler),
* . . .
* }
* )
* </pre>
* or:
* <pre>
* myDiagram.commandHandler = new LocalStorageCommandHandler();
* </pre>
*/
function LocalStorageCommandHandler() {
go.CommandHandler.call(this);
this.StorageKey = "go._clipboard";
this.FormatKey = "go._clipboardFormat";
}
go.Diagram.inherit(LocalStorageCommandHandler, go.CommandHandler);
/**
* @override
* @this {LocalStorageCommandHandler}
* @param {Iterable.<Part>} coll a collection of {@link Part}s.
*/
LocalStorageCommandHandler.prototype.copyToClipboard = function(coll) {
try {
if (coll === null) {
window.localStorage.setItem(this.StorageKey, "");
window.localStorage.setItem(this.FormatKey, "");
} else {
var clipdiag = new go.Diagram(); // create a temporary Diagram
// copy from this diagram to the temporary diagram some properties that affects copying:
clipdiag.isTreePathToChildren = this.diagram.isTreePathToChildren;
clipdiag.toolManager.draggingTool.dragsLink = this.diagram.toolManager.draggingTool.dragsLink;
// create a model like this one but with no data
clipdiag.model = this.diagram.model.copy();
// copy the given Parts into this temporary Diagram
this.diagram.copyParts(coll, clipdiag, false);
window.localStorage.setItem(this.StorageKey, clipdiag.model.toJson());
window.localStorage.setItem(this.FormatKey, clipdiag.model.dataFormat);
}
} catch (ex) {
// fallback implementation
go.CommandHandler.prototype.copyToClipboard.call(this, coll);
}
};
/**
* @override
* @this {LocalStorageCommandHandler}
* @return {Set.<Part>} a collection of newly pasted {@link Part}s
*/
LocalStorageCommandHandler.prototype.pasteFromClipboard = function() {
var coll = new go.Set(go.Part);
try {
var clipstr = window.localStorage.getItem(this.StorageKey);
var clipfrmt = window.localStorage.getItem(this.FormatKey);
if (clipstr === null || clipstr === "" || clipfrmt !== this.diagram.model.dataFormat) {
return coll;
} else {
var clipdiag = new go.Diagram(); // create a temporary Diagram
// recover the model from the clipboard rendering
clipdiag.model = go.Model.fromJson(clipstr);
// copy all the CLIPDIAG Parts into this Diagram
const all = new go.List().addAll(clipdiag.parts).addAll(clipdiag.nodes).addAll(clipdiag.links);
var copymap = this.diagram.copyParts(all, this.diagram, false);
// return a Set of the copied Parts
return new go.Set(go.Part).addAll(copymap.iteratorValues);
}
} catch (ex) {
// fallback implementation
return go.CommandHandler.prototype.pasteFromClipboard.call(this);
}
};
/**
* @override
* @this {LocalStorageCommandHandler}
* @return {boolean}
*/
LocalStorageCommandHandler.prototype.canPasteSelection = function() {
var diagram = this.diagram;
if (diagram === null || diagram.isReadOnly || diagram.isModelReadOnly) return false;
if (!diagram.allowInsert || !diagram.allowClipboard) return false;
try {
var clipstr = window.localStorage.getItem(this.StorageKey);
var clipfrmt = window.localStorage.getItem(this.FormatKey);
if (clipstr === null || clipstr === "") return false;
if (clipfrmt !== diagram.model.dataFormat) return false;
return true;
} catch (ex) {
// fallback implementation
return go.CommandHandler.prototype.canPasteSelection();
}
};