150 lines
4.8 KiB
JavaScript
150 lines
4.8 KiB
JavaScript
"use strict";
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/*
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* Copyright (C) 1998-2017 by Northwoods Software Corporation. All Rights Reserved.
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*/
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// A custom Tool for moving a label on a Node
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/**
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* @constructor
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* @extends Tool
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* @class
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* This tool only works when the Node has a label (any GraphObject) marked with
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* { _isNodeLabel: true } that is positioned in a Spot Panel.
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* It works by modifying that label's GraphObject.alignment property to have an
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* offset from the center of the panel.
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*/
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function NodeLabelDraggingTool() {
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go.Tool.call(this);
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this.name = "NodeLabelDragging";
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/** @type {GraphObject} */
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this.label = null;
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/** @type {Point} */
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this._offset = new go.Point(); // of the mouse relative to the center of the label object
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/** @type {Point} */
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this._originalAlignment = null;
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/** @type {Point} */
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this._originalCenter = null;
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}
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go.Diagram.inherit(NodeLabelDraggingTool, go.Tool);
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/**
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* This tool can only start if the mouse has moved enough so that it is not a click,
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* and if the mouse down point is on a GraphObject "label" in a Spot Panel,
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* as determined by findLabel().
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* @this {NodeLabelDraggingTool}
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* @return {boolean}
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*/
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NodeLabelDraggingTool.prototype.canStart = function() {
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if (!go.Tool.prototype.canStart.call(this)) return false;
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var diagram = this.diagram;
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if (diagram === null) return false;
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// require left button & that it has moved far enough away from the mouse down point, so it isn't a click
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var e = diagram.lastInput;
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if (!e.left) return false;
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if (!this.isBeyondDragSize()) return false;
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return this.findLabel() !== null;
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}
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/**
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* From the GraphObject at the mouse point, search up the visual tree until we get to
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* an object that has the "_isNodeLabel" property set to true, that is in a Spot Panel,
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* and that is not the first element of that Panel (i.e. not the main element of the panel).
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* @this {NodeLabelDraggingTool}
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* @return {GraphObject} This returns null if no such label is at the mouse down point.
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*/
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NodeLabelDraggingTool.prototype.findLabel = function() {
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var diagram = this.diagram;
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var e = diagram.firstInput;
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var elt = diagram.findObjectAt(e.documentPoint, null, null);
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if (elt === null || !(elt.part instanceof go.Node)) return null;
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while (elt.panel !== null) {
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if (elt._isNodeLabel && elt.panel.type === go.Panel.Spot && elt.panel.findMainElement() !== elt) return elt;
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elt = elt.panel;
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}
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return null;
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};
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/**
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* Start a transaction, call findLabel and remember it as the "label" property,
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* and remember the original value for the label's alignment property.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doActivate = function() {
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this.startTransaction("Shifted Label");
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this.label = this.findLabel();
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if (this.label !== null) {
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// compute the offset of the mouse-down point relative to the center of the label
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this._offset = this.diagram.firstInput.documentPoint.copy().subtract(this.label.getDocumentPoint(go.Spot.Center));
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this._originalAlignment = this.label.alignment.copy();
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var main = this.label.panel.findMainElement();
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this._originalCenter = main.getDocumentPoint(go.Spot.Center);
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}
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go.Tool.prototype.doActivate.call(this);
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}
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/**
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* Stop any ongoing transaction.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doDeactivate = function() {
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go.Tool.prototype.doDeactivate.call(this);
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this.stopTransaction();
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}
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/**
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* Clear any reference to a label element.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doStop = function() {
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this.label = null;
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go.Tool.prototype.doStop.call(this);
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}
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/**
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* Restore the label's original value for GraphObject.alignment.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doCancel = function() {
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if (this.label !== null) {
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this.label.alignment = this._originalAlignment;
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}
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go.Tool.prototype.doCancel.call(this);
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}
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/**
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* During the drag, call updateAlignment in order to set the GraphObject.alignment of the label.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doMouseMove = function() {
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if (!this.isActive) return;
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this.updateAlignment();
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}
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/**
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* At the end of the drag, update the alignment of the label and finish the tool,
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* completing a transaction.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.doMouseUp = function() {
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if (!this.isActive) return;
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this.updateAlignment();
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this.transactionResult = "Shifted Label";
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this.stopTool();
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}
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/**
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* Save the label's GraphObject.alignment as an absolute offset from the center of the Spot Panel
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* that the label is in.
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* @this {NodeLabelDraggingTool}
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*/
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NodeLabelDraggingTool.prototype.updateAlignment = function() {
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if (this.label === null) return;
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var last = this.diagram.lastInput.documentPoint;
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var cntr = this._originalCenter;
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this.label.alignment = new go.Spot(0.5, 0.5, last.x - this._offset.x - cntr.x, last.y - this._offset.y - cntr.y);
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}
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