gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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JavaScript
/*
* Copyright (C) 1998-2023 by Northwoods Software Corporation. All Rights Reserved.
*/
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
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};
return function (d, b) {
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throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
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};
})();
(function (factory) {
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else if (typeof define === "function" && define.amd) {
define(["require", "exports", "../release/go.js"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.LinkLabelDraggingTool = void 0;
/*
* This is an extension and not part of the main GoJS library.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsJSM folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/
var go = require("../release/go.js");
/**
* The LinkLabelDraggingTool class lets the user move a label on a {@link Link}.
*
* This tool only works when the Link has a label
* that is positioned at the {@link Link#midPoint} plus some offset.
* It does not work for labels that have a particular {@link GraphObject#segmentIndex}.
*
* If you want to experiment with this extension, try the <a href="../../extensionsJSM/LinkLabelDragging.html">Link Label Dragging</a> sample.
* @category Tool Extension
*/
var LinkLabelDraggingTool = /** @class */ (function (_super) {
__extends(LinkLabelDraggingTool, _super);
/**
* Constructs a LinkLabelDraggingTool and sets the name for the tool.
*/
function LinkLabelDraggingTool() {
var _this = _super.call(this) || this;
/**
* The label being dragged.
*/
_this.label = null;
_this._offset = new go.Point(); // of the mouse relative to the center of the label object
_this._originalOffset = null;
_this.name = 'LinkLabelDragging';
return _this;
}
/**
* From the GraphObject at the mouse point, search up the visual tree until we get to
* an object that is a label of a Link.
* @return {GraphObject} This returns null if no such label is at the mouse down point.
*/
LinkLabelDraggingTool.prototype.findLabel = function () {
var diagram = this.diagram;
var e = diagram.lastInput;
var elt = diagram.findObjectAt(e.documentPoint, null, null);
if (elt === null || !(elt.part instanceof go.Link))
return null;
while (elt !== null && elt.panel !== elt.part) {
elt = elt.panel;
}
// If it's at an arrowhead segment index, don't consider it a label:
if (elt !== null && (elt.segmentIndex === 0 || elt.segmentIndex === -1))
return null;
return elt;
};
/**
* This tool can only start if the mouse has moved enough so that it is not a click,
* and if the mouse down point is on a GraphObject "label" in a Link Panel,
* as determined by {@link #findLabel}.
*/
LinkLabelDraggingTool.prototype.canStart = function () {
if (!_super.prototype.canStart.call(this))
return false;
var diagram = this.diagram;
// require left button & that it has moved far enough away from the mouse down point, so it isn't a click
var e = diagram.lastInput;
if (!e.left)
return false;
if (!this.isBeyondDragSize())
return false;
return this.findLabel() !== null;
};
/**
* Start a transaction, call {@link #findLabel} and remember it as the "label" property,
* and remember the original value for the label's {@link GraphObject#segmentOffset} property.
*/
LinkLabelDraggingTool.prototype.doActivate = function () {
this.startTransaction('Shifted Label');
this.label = this.findLabel();
if (this.label !== null) {
// compute the offset of the mouse-down point relative to the center of the label
this._offset = this.diagram.firstInput.documentPoint.copy().subtract(this.label.getDocumentPoint(go.Spot.Center));
this._originalOffset = this.label.segmentOffset.copy();
}
_super.prototype.doActivate.call(this);
};
/**
* Stop any ongoing transaction.
*/
LinkLabelDraggingTool.prototype.doDeactivate = function () {
_super.prototype.doDeactivate.call(this);
this.stopTransaction();
};
/**
* Clear any reference to a label element.
*/
LinkLabelDraggingTool.prototype.doStop = function () {
this.label = null;
_super.prototype.doStop.call(this);
};
/**
* Restore the label's original value for {@link GraphObject#segmentOffset}.
*/
LinkLabelDraggingTool.prototype.doCancel = function () {
if (this.label !== null && this._originalOffset !== null) {
this.label.segmentOffset = this._originalOffset;
}
_super.prototype.doCancel.call(this);
};
/**
* During the drag, call {@link #updateSegmentOffset} in order to set
* the {@link GraphObject#segmentOffset} of the label.
*/
LinkLabelDraggingTool.prototype.doMouseMove = function () {
if (!this.isActive)
return;
this.updateSegmentOffset();
};
/**
* At the end of the drag, update the segment offset of the label and finish the tool,
* completing a transaction.
*/
LinkLabelDraggingTool.prototype.doMouseUp = function () {
if (!this.isActive)
return;
this.updateSegmentOffset();
this.transactionResult = 'Shifted Label';
this.stopTool();
};
/**
* Save the label's {@link GraphObject#segmentOffset} as a rotated offset from the midpoint of the
* Link that the label is in.
*/
LinkLabelDraggingTool.prototype.updateSegmentOffset = function () {
var lab = this.label;
if (lab === null)
return;
var link = lab.part;
if (!(link instanceof go.Link))
return;
var last = this.diagram.lastInput.documentPoint;
var idx = lab.segmentIndex;
var numpts = link.pointsCount;
if (isNaN(idx) && link.path) { // handle fractions along the whole path
var labpt = link.path.getDocumentPoint(link.geometry.getPointAlongPath(lab.segmentFraction));
var angle = link.geometry.getAngleAlongPath(lab.segmentFraction);
var p = new go.Point(last.x - this._offset.x - labpt.x, last.y - this._offset.y - labpt.y);
lab.segmentOffset = p.rotate(-angle);
}
else if (idx < -numpts || idx >= numpts) {
// if the label is a "mid" label, assume it is positioned differently from a label at a particular segment
var mid = link.midPoint;
// need to rotate this point to account for the angle of the link segment at the mid-point
var p = new go.Point(last.x - this._offset.x - mid.x, last.y - this._offset.y - mid.y);
lab.segmentOffset = p.rotate(-link.midAngle);
}
else { // handle the label point being on a partiular segment with a given fraction
var frac = lab.segmentFraction;
var a = void 0;
var b = void 0;
if (idx >= 0) { // indexing forwards
a = link.getPoint(idx);
b = (idx < numpts - 1) ? link.getPoint(idx + 1) : a;
}
else { // or backwards if segmentIndex is negative
var i = numpts + idx;
a = link.getPoint(i);
b = (i > 0) ? link.getPoint(i - 1) : a;
}
var labx = a.x + (b.x - a.x) * frac;
var laby = a.y + (b.y - a.y) * frac;
var p = new go.Point(last.x - this._offset.x - labx, last.y - this._offset.y - laby);
var segangle = (idx >= 0) ? a.directionPoint(b) : b.directionPoint(a);
lab.segmentOffset = p.rotate(-segangle);
}
};
return LinkLabelDraggingTool;
}(go.Tool));
exports.LinkLabelDraggingTool = LinkLabelDraggingTool;
});