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463 lines
21 KiB
JavaScript
Executable File
463 lines
21 KiB
JavaScript
Executable File
/*
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* Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
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*/
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/*
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* This is an extension and not part of the main GoJS library.
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* Note that the API for this class may change with any version, even point releases.
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* If you intend to use an extension in production, you should copy the code to your own source directory.
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* Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
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* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
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*/
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import * as go from '../release/go-module.js';
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/**
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* The GuidedDraggingTool class makes guidelines visible as the parts are dragged around a diagram
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* when the selected part is nearly aligned with another part.
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*
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* If you want to experiment with this extension, try the <a href="../../extensionsTS/GuidedDragging.html">Guided Dragging</a> sample.
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* @category Tool Extension
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*/
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export class GuidedDraggingTool extends go.DraggingTool {
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/**
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* Constructs a GuidedDraggingTool and sets up the temporary guideline parts.
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*/
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constructor() {
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super();
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// properties that the programmer can modify
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this._guidelineSnapDistance = 6;
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this._isGuidelineEnabled = true;
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this._horizontalGuidelineColor = 'gray';
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this._verticalGuidelineColor = 'gray';
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this._centerGuidelineColor = 'gray';
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this._guidelineWidth = 1;
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this._searchDistance = 1000;
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this._isGuidelineSnapEnabled = true;
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const partProperties = { layerName: 'Tool', isInDocumentBounds: false };
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const shapeProperties = { stroke: 'gray', isGeometryPositioned: true };
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const $ = go.GraphObject.make;
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// temporary parts for horizonal guidelines
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this.guidelineHtop =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 100 0' }));
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this.guidelineHbottom =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 100 0' }));
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this.guidelineHcenter =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 100 0' }));
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// temporary parts for vertical guidelines
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this.guidelineVleft =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 0 100' }));
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this.guidelineVright =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 0 100' }));
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this.guidelineVcenter =
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$(go.Part, partProperties, $(go.Shape, shapeProperties, { geometryString: 'M0 0 0 100' }));
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}
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/**
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* Gets or sets the margin of error for which guidelines show up.
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*
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* The default value is 6.
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* Guidelines will show up when the aligned nods are ± 6px away from perfect alignment.
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*/
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get guidelineSnapDistance() { return this._guidelineSnapDistance; }
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set guidelineSnapDistance(val) {
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if (typeof val !== 'number' || isNaN(val) || val < 0)
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throw new Error('new value for GuideddraggingTool.guidelineSnapDistance must be a non-negative number');
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if (this._guidelineSnapDistance !== val) {
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this._guidelineSnapDistance = val;
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}
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}
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/**
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* Gets or sets whether the guidelines are enabled or disable.
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*
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* The default value is true.
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*/
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get isGuidelineEnabled() { return this._isGuidelineEnabled; }
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set isGuidelineEnabled(val) {
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if (typeof val !== 'boolean')
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throw new Error('new value for GuidedDraggingTool.isGuidelineEnabled must be a boolean value.');
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if (this._isGuidelineEnabled !== val) {
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this._isGuidelineEnabled = val;
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}
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}
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/**
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* Gets or sets the color of horizontal guidelines.
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*
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* The default value is "gray".
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*/
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get horizontalGuidelineColor() { return this._horizontalGuidelineColor; }
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set horizontalGuidelineColor(val) {
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if (this._horizontalGuidelineColor !== val) {
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this._horizontalGuidelineColor = val;
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this.guidelineHbottom.elements.first().stroke = this._horizontalGuidelineColor;
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this.guidelineHtop.elements.first().stroke = this._horizontalGuidelineColor;
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}
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}
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/**
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* Gets or sets the color of vertical guidelines.
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*
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* The default value is "gray".
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*/
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get verticalGuidelineColor() { return this._verticalGuidelineColor; }
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set verticalGuidelineColor(val) {
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if (this._verticalGuidelineColor !== val) {
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this._verticalGuidelineColor = val;
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this.guidelineVleft.elements.first().stroke = this._verticalGuidelineColor;
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this.guidelineVright.elements.first().stroke = this._verticalGuidelineColor;
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}
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}
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/**
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* Gets or sets the color of center guidelines.
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*
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* The default value is "gray".
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*/
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get centerGuidelineColor() { return this._centerGuidelineColor; }
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set centerGuidelineColor(val) {
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if (this._centerGuidelineColor !== val) {
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this._centerGuidelineColor = val;
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this.guidelineVcenter.elements.first().stroke = this._centerGuidelineColor;
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this.guidelineHcenter.elements.first().stroke = this._centerGuidelineColor;
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}
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}
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/**
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* Gets or sets the width guidelines.
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*
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* The default value is 1.
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*/
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get guidelineWidth() { return this._guidelineWidth; }
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set guidelineWidth(val) {
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if (typeof val !== 'number' || isNaN(val) || val < 0)
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throw new Error('New value for GuidedDraggingTool.guidelineWidth must be a non-negative number.');
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if (this._guidelineWidth !== val) {
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this._guidelineWidth = val;
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this.guidelineVcenter.elements.first().strokeWidth = val;
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this.guidelineHcenter.elements.first().strokeWidth = val;
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this.guidelineVleft.elements.first().strokeWidth = val;
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this.guidelineVright.elements.first().strokeWidth = val;
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this.guidelineHbottom.elements.first().strokeWidth = val;
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this.guidelineHtop.elements.first().strokeWidth = val;
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}
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}
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/**
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* Gets or sets the distance around the selected part to search for aligned parts.
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*
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* The default value is 1000.
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* Set this to Infinity if you want to search the entire diagram no matter how far away.
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*/
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get searchDistance() { return this._searchDistance; }
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set searchDistance(val) {
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if (typeof val !== 'number' || isNaN(val) || val <= 0)
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throw new Error('new value for GuidedDraggingTool.searchDistance must be a positive number.');
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if (this._searchDistance !== val) {
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this._searchDistance = val;
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}
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}
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/**
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* Gets or sets whether snapping to guidelines is enabled.
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*
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* The default value is true.
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*/
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get isGuidelineSnapEnabled() { return this._isGuidelineSnapEnabled; }
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set isGuidelineSnapEnabled(val) {
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if (typeof val !== 'boolean')
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throw new Error('new value for GuidedDraggingTool.isGuidelineSnapEnabled must be a boolean.');
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if (this._isGuidelineSnapEnabled !== val) {
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this._isGuidelineSnapEnabled = val;
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}
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}
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/**
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* Removes all of the guidelines from the grid.
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*/
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clearGuidelines() {
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this.diagram.remove(this.guidelineHbottom);
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this.diagram.remove(this.guidelineHcenter);
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this.diagram.remove(this.guidelineHtop);
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this.diagram.remove(this.guidelineVleft);
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this.diagram.remove(this.guidelineVright);
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this.diagram.remove(this.guidelineVcenter);
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}
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/**
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* Calls the base method and removes the guidelines from the graph.
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*/
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doDeactivate() {
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super.doDeactivate();
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// clear any guidelines when dragging is done
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this.clearGuidelines();
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}
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/**
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* Shows vertical and horizontal guidelines for the dragged part.
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*/
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doDragOver(pt, obj) {
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// clear all existing guidelines in case either show... method decides to show a guideline
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this.clearGuidelines();
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// gets the selected part
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const draggingParts = this.copiedParts || this.draggedParts;
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if (draggingParts === null)
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return;
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const partItr = draggingParts.iterator;
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if (partItr.next()) {
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const part = partItr.key;
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this.showHorizontalMatches(part, this.isGuidelineEnabled, false);
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this.showVerticalMatches(part, this.isGuidelineEnabled, false);
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}
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}
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/**
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* On a mouse-up, snaps the selected part to the nearest guideline.
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* If not snapping, the part remains at its position.
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*/
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doDropOnto(pt, obj) {
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this.clearGuidelines();
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// gets the selected (perhaps copied) Part
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const draggingParts = this.copiedParts || this.draggedParts;
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if (draggingParts === null)
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return;
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const partItr = draggingParts.iterator;
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if (partItr.next()) {
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const part = partItr.key;
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// snaps only when the mouse is released without shift modifier
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const e = this.diagram.lastInput;
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const snap = this.isGuidelineSnapEnabled && !e.shift;
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this.showHorizontalMatches(part, false, snap); // false means don't show guidelines
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this.showVerticalMatches(part, false, snap);
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}
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}
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/**
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* When nodes are shifted due to being guided upon a drop, make sure all connected link routes are invalidated,
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* since the node is likely to have moved a different amount than all its connected links in the regular
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* operation of the DraggingTool.
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*/
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invalidateLinks(node) {
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if (node instanceof go.Node)
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node.invalidateConnectedLinks();
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}
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/**
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* This predicate decides whether or not the given Part should guide the dragged part.
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* @param {Part} part a stationary Part to which the dragged part might be aligned
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* @param {Part} guidedpart the Part being dragged
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*/
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isGuiding(part, guidedpart) {
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return part instanceof go.Part &&
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!part.isSelected &&
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!(part instanceof go.Link) &&
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guidedpart instanceof go.Part &&
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part.containingGroup === guidedpart.containingGroup &&
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part.layer !== null && !part.layer.isTemporary;
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}
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/**
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* This finds parts that are aligned near the selected part along horizontal lines. It compares the selected
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* part to all parts within a rectangle approximately twice the {@link #searchDistance} wide.
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* The guidelines appear when a part is aligned within a margin-of-error equal to {@link #guidelineSnapDistance}.
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* @param {Node} part
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* @param {boolean} guideline if true, show guideline
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* @param {boolean} snap if true, snap the part to where the guideline would be
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*/
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showHorizontalMatches(part, guideline, snap) {
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const objBounds = part.locationObject.getDocumentBounds();
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const p0 = objBounds.y;
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const p1 = objBounds.y + objBounds.height / 2;
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const p2 = objBounds.y + objBounds.height;
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const marginOfError = this.guidelineSnapDistance;
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const distance = this.searchDistance;
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// compares with parts within narrow vertical area
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const area = objBounds.copy();
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area.inflate(distance, marginOfError + 1);
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const otherObjs = this.diagram.findObjectsIn(area, (obj) => obj.part, (p) => this.isGuiding(p, part), true);
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let bestDiff = marginOfError;
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let bestObj = null; // TS 2.6 won't let this be go.Part | null
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let bestSpot = go.Spot.Default;
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let bestOtherSpot = go.Spot.Default;
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// horizontal line -- comparing y-values
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otherObjs.each((other) => {
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if (other === part)
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return; // ignore itself
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const otherBounds = other.locationObject.getDocumentBounds();
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const q0 = otherBounds.y;
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const q1 = otherBounds.y + otherBounds.height / 2;
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const q2 = otherBounds.y + otherBounds.height;
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// compare center with center of OTHER part
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if (Math.abs(p1 - q1) < bestDiff) {
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bestDiff = Math.abs(p1 - q1);
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bestObj = other;
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bestSpot = go.Spot.Center;
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bestOtherSpot = go.Spot.Center;
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}
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// compare top side with top and bottom sides of OTHER part
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if (Math.abs(p0 - q0) < bestDiff) {
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bestDiff = Math.abs(p0 - q0);
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bestObj = other;
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bestSpot = go.Spot.Top;
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bestOtherSpot = go.Spot.Top;
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}
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else if (Math.abs(p0 - q2) < bestDiff) {
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bestDiff = Math.abs(p0 - q2);
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bestObj = other;
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bestSpot = go.Spot.Top;
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bestOtherSpot = go.Spot.Bottom;
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}
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// compare bottom side with top and bottom sides of OTHER part
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if (Math.abs(p2 - q0) < bestDiff) {
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bestDiff = Math.abs(p2 - q0);
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bestObj = other;
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bestSpot = go.Spot.Bottom;
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bestOtherSpot = go.Spot.Top;
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}
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else if (Math.abs(p2 - q2) < bestDiff) {
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bestDiff = Math.abs(p2 - q2);
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bestObj = other;
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bestSpot = go.Spot.Bottom;
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bestOtherSpot = go.Spot.Bottom;
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}
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});
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if (bestObj !== null) {
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const offsetX = objBounds.x - part.actualBounds.x;
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const offsetY = objBounds.y - part.actualBounds.y;
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const bestBounds = bestObj.locationObject.getDocumentBounds();
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// line extends from x0 to x2
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const x0 = Math.min(objBounds.x, bestBounds.x) - 10;
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const x2 = Math.max(objBounds.x + objBounds.width, bestBounds.x + bestBounds.width) + 10;
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// find bestObj's desired Y
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const bestPoint = new go.Point().setRectSpot(bestBounds, bestOtherSpot);
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if (bestSpot === go.Spot.Center) {
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if (snap) {
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// call Part.move in order to automatically move member Parts of Groups
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part.move(new go.Point(objBounds.x - offsetX, bestPoint.y - objBounds.height / 2 - offsetY));
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this.invalidateLinks(part);
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}
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if (guideline) {
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this.guidelineHcenter.position = new go.Point(x0, bestPoint.y);
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this.guidelineHcenter.elt(0).width = x2 - x0;
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this.diagram.add(this.guidelineHcenter);
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}
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}
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else if (bestSpot === go.Spot.Top) {
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if (snap) {
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part.move(new go.Point(objBounds.x - offsetX, bestPoint.y - offsetY));
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this.invalidateLinks(part);
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}
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if (guideline) {
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this.guidelineHtop.position = new go.Point(x0, bestPoint.y);
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this.guidelineHtop.elt(0).width = x2 - x0;
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this.diagram.add(this.guidelineHtop);
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}
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}
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else if (bestSpot === go.Spot.Bottom) {
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if (snap) {
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part.move(new go.Point(objBounds.x - offsetX, bestPoint.y - objBounds.height - offsetY));
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this.invalidateLinks(part);
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}
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if (guideline) {
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this.guidelineHbottom.position = new go.Point(x0, bestPoint.y);
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this.guidelineHbottom.elt(0).width = x2 - x0;
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this.diagram.add(this.guidelineHbottom);
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}
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}
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}
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}
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/**
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* This finds parts that are aligned near the selected part along vertical lines. It compares the selected
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* part to all parts within a rectangle approximately twice the {@link #searchDistance} tall.
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* The guidelines appear when a part is aligned within a margin-of-error equal to {@link #guidelineSnapDistance}.
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* @param {Part} part
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* @param {boolean} guideline if true, show guideline
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* @param {boolean} snap if true, don't show guidelines but just snap the part to where the guideline would be
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*/
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showVerticalMatches(part, guideline, snap) {
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const objBounds = part.locationObject.getDocumentBounds();
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const p0 = objBounds.x;
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const p1 = objBounds.x + objBounds.width / 2;
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const p2 = objBounds.x + objBounds.width;
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const marginOfError = this.guidelineSnapDistance;
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const distance = this.searchDistance;
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// compares with parts within narrow vertical area
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const area = objBounds.copy();
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area.inflate(marginOfError + 1, distance);
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const otherObjs = this.diagram.findObjectsIn(area, (obj) => obj.part, (p) => this.isGuiding(p, part), true);
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let bestDiff = marginOfError;
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let bestObj = null; // TS 2.6 won't let this be go.Part | null
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let bestSpot = go.Spot.Default;
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let bestOtherSpot = go.Spot.Default;
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// vertical line -- comparing x-values
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otherObjs.each((other) => {
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if (other === part)
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return; // ignore itself
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const otherBounds = other.locationObject.getDocumentBounds();
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const q0 = otherBounds.x;
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const q1 = otherBounds.x + otherBounds.width / 2;
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const q2 = otherBounds.x + otherBounds.width;
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// compare center with center of OTHER part
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if (Math.abs(p1 - q1) < bestDiff) {
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bestDiff = Math.abs(p1 - q1);
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bestObj = other;
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bestSpot = go.Spot.Center;
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bestOtherSpot = go.Spot.Center;
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}
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// compare left side with left and right sides of OTHER part
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if (Math.abs(p0 - q0) < bestDiff) {
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bestDiff = Math.abs(p0 - q0);
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bestObj = other;
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bestSpot = go.Spot.Left;
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bestOtherSpot = go.Spot.Left;
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}
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else if (Math.abs(p0 - q2) < bestDiff) {
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bestDiff = Math.abs(p0 - q2);
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bestObj = other;
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bestSpot = go.Spot.Left;
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bestOtherSpot = go.Spot.Right;
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}
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// compare right side with left and right sides of OTHER part
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if (Math.abs(p2 - q0) < bestDiff) {
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bestDiff = Math.abs(p2 - q0);
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bestObj = other;
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bestSpot = go.Spot.Right;
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bestOtherSpot = go.Spot.Left;
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}
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else if (Math.abs(p2 - q2) < bestDiff) {
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bestDiff = Math.abs(p2 - q2);
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bestObj = other;
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bestSpot = go.Spot.Right;
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bestOtherSpot = go.Spot.Right;
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}
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});
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if (bestObj !== null) {
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const offsetX = objBounds.x - part.actualBounds.x;
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const offsetY = objBounds.y - part.actualBounds.y;
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const bestBounds = bestObj.locationObject.getDocumentBounds();
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// line extends from y0 to y2
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const y0 = Math.min(objBounds.y, bestBounds.y) - 10;
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const y2 = Math.max(objBounds.y + objBounds.height, bestBounds.y + bestBounds.height) + 10;
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// find bestObj's desired X
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const bestPoint = new go.Point().setRectSpot(bestBounds, bestOtherSpot);
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if (bestSpot === go.Spot.Center) {
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if (snap) {
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// call Part.move in order to automatically move member Parts of Groups
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part.move(new go.Point(bestPoint.x - objBounds.width / 2 - offsetX, objBounds.y - offsetY));
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this.invalidateLinks(part);
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}
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if (guideline) {
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this.guidelineVcenter.position = new go.Point(bestPoint.x, y0);
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this.guidelineVcenter.elt(0).height = y2 - y0;
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this.diagram.add(this.guidelineVcenter);
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}
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}
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else if (bestSpot === go.Spot.Left) {
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if (snap) {
|
|
part.move(new go.Point(bestPoint.x - offsetX, objBounds.y - offsetY));
|
|
this.invalidateLinks(part);
|
|
}
|
|
if (guideline) {
|
|
this.guidelineVleft.position = new go.Point(bestPoint.x, y0);
|
|
this.guidelineVleft.elt(0).height = y2 - y0;
|
|
this.diagram.add(this.guidelineVleft);
|
|
}
|
|
}
|
|
else if (bestSpot === go.Spot.Right) {
|
|
if (snap) {
|
|
part.move(new go.Point(bestPoint.x - objBounds.width - offsetX, objBounds.y - offsetY));
|
|
this.invalidateLinks(part);
|
|
}
|
|
if (guideline) {
|
|
this.guidelineVright.position = new go.Point(bestPoint.x, y0);
|
|
this.guidelineVright.elt(0).height = y2 - y0;
|
|
this.diagram.add(this.guidelineVright);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|