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117 lines
4.3 KiB
117 lines
4.3 KiB
"use strict";
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/*
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* Copyright (C) 1998-2019 by Northwoods Software Corporation. All Rights Reserved.
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*/
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// A custom DraggingTool for dragging an image instead of actually moving any selected nodes,
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// until the mouse-up event.
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/**
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* @constructor
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* @extends DraggingTool
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* @class
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*/
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function NonRealtimeDraggingTool() {
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go.DraggingTool.call(this);
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/** @type {Part} */
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this._imagePart = null; // a Part holding a translucent image of what would be dragged
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/** @type {Map.<Part,DraggingInfo>} */
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this._ghostDraggedParts = null; // a Map of the _imagePart and its dragging information
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/** @type {Map.<Part,DraggingInfo>} */
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this._originalDraggedParts = null; // the saved normal value of DraggingTool.draggedParts
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}
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go.Diagram.inherit(NonRealtimeDraggingTool, go.DraggingTool);
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/**
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* Call the base method, and then make an image of the returned collection,
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* show it using a Picture, and hold the Picture in a temporary Part, as _imagePart.
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* @this {NonRealtimeDraggingTool}
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* @param {Iterable.<Part>} parts A {@link Set} or {@link List} of {@link Part}s.
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* @return {Map.<Part,DraggingInfo>}
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*/
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NonRealtimeDraggingTool.prototype.computeEffectiveCollection = function(coll) {
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var map = go.DraggingTool.prototype.computeEffectiveCollection.call(this, coll);
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if (this.isActive && this._imagePart === null) {
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var bounds = this.diagram.computePartsBounds(map.toKeySet());
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var offset = this.diagram.lastInput.documentPoint.copy().subtract(bounds.position);
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var $ = go.GraphObject.make;
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this._imagePart =
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$(go.Part,
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{ layerName: "Tool", opacity: 0.5, locationSpot: new go.Spot(0, 0, offset.x, offset.y) },
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$(go.Picture,
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{ element: this.diagram.makeImage({ parts: map.toKeySet() }) })
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);
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}
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return map;
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};
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/**
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* When activated, replace the DraggingTool.draggedParts with the _ghostDraggedParts, which
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* consists of just one Part, the _imagePart, added to the Diagram at the current mouse point.
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* @this {NonRealtimeDraggingTool}
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*/
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NonRealtimeDraggingTool.prototype.doActivate = function() {
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go.DraggingTool.prototype.doActivate.call(this);
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if (this._imagePart !== null) {
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this._imagePart.location = this.diagram.lastInput.documentPoint;
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this.diagram.add(this._imagePart);
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this._originalDraggedParts = this.draggedParts;
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this._ghostDraggedParts = go.DraggingTool.prototype.computeEffectiveCollection.call(this,
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new go.List().addAll([this._imagePart]));
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this.draggedParts = this._ghostDraggedParts;
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}
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};
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/**
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* When deactivated, make sure any _imagePart is removed from the Diagram and all references are cleared out.
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* @this {NonRealtimeDraggingTool}
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*/
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NonRealtimeDraggingTool.prototype.doDeactivate = function() {
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if (this._imagePart !== null) {
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this.diagram.remove(this._imagePart);
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}
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this._imagePart = null;
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this._ghostDraggedParts = null;
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this._originalDraggedParts = null;
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go.DraggingTool.prototype.doDeactivate.call(this);
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};
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/**
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* Do the normal mouse-up behavior, but only after restoring DraggingTool.draggedParts.
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* @this {NonRealtimeDraggingTool}
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*/
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NonRealtimeDraggingTool.prototype.doMouseUp = function() {
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if (this._originalDraggedParts !== null) {
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this.draggedParts = this._originalDraggedParts;
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}
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go.DraggingTool.prototype.doMouseUp.call(this);
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};
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/**
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* If the user changes to "copying" mode by holding down the Control key,
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* return to the regular behavior and remove the _imagePart.
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* @this {NonRealtimeDraggingTool}
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*/
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NonRealtimeDraggingTool.prototype.doKeyDown = function() {
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if (this._imagePart !== null && this._originalDraggedParts !== null &&
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(this.diagram.lastInput.control || this.diagram.lastInput.meta) && this.mayCopy()) {
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this.draggedParts = this._originalDraggedParts;
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this.diagram.remove(this._imagePart);
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}
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go.DraggingTool.prototype.doKeyDown.call(this);
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};
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/**
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* If the user changes back to "moving" mode,
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* show the _imagePart again and go back to dragging the _ghostDraggedParts.
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* @this {NonRealtimeDraggingTool}
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*/
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NonRealtimeDraggingTool.prototype.doKeyUp = function() {
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if (this._imagePart !== null && this._ghostDraggedParts !== null && this.mayMove()) {
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this._imagePart.location = this.diagram.lastInput.documentPoint;
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this.diagram.add(this._imagePart);
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this.draggedParts = this._ghostDraggedParts;
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}
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go.DraggingTool.prototype.doKeyUp.call(this);
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};
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