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105 lines
4.0 KiB
105 lines
4.0 KiB
/*
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* Copyright (C) 1998-2019 by Northwoods Software Corporation. All Rights Reserved.
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*/
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import * as go from '../release/go';
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/**
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* The NonRealtimeDraggingTool class lets the user drag 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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* If you want to experiment with this extension, try the <a href="../../extensionsTS/NonRealtimeDragging.html">Non Realtime Dragging</a> sample.
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* @category Tool Extension
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*/
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export class NonRealtimeDraggingTool extends go.DraggingTool {
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private _imagePart: go.Part | null = null; // a Part holding a translucent image of what would be dragged
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private _ghostDraggedParts: go.Map<go.Part, go.DraggingInfo> | null = null; // a Map of the _imagePart and its dragging information
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private _originalDraggedParts: go.Map<go.Part, go.DraggingInfo> | null = null; // the saved normal value of DraggingTool.draggedParts
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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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* @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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public computeEffectiveCollection(coll: go.Iterable<go.Part>): go.Map<go.Part, go.DraggingInfo> {
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const map = super.computeEffectiveCollection(coll, this.dragOptions);
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if (this.isActive && this._imagePart === null) {
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const bounds = this.diagram.computePartsBounds(map.toKeySet());
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const offset = this.diagram.lastInput.documentPoint.copy().subtract(bounds.position);
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const $ = 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 {@link #draggedParts} with the ghost dragged parts, which
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* consists of just one Part, the image, added to the Diagram at the current mouse point.
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*/
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public doActivate(): void {
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super.doActivate();
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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 = super.computeEffectiveCollection(new go.List<go.Part>().add(this._imagePart), this.dragOptions);
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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 image is removed from the Diagram and all references are cleared out.
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*/
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public doDeactivate(): void {
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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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super.doDeactivate();
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}
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/**
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* Do the normal mouse-up behavior, but only after restoring {@link #draggedParts}.
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*/
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public doMouseUp(): void {
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if (this._originalDraggedParts !== null) {
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this.draggedParts = this._originalDraggedParts;
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}
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super.doMouseUp();
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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 image.
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*/
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public doKeyDown(): void {
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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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super.doKeyDown();
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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 image again and go back to dragging the ghost dragged parts.
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*/
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public doKeyUp(): void {
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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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super.doKeyUp();
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}
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}
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