260 lines
8.4 KiB
JavaScript
260 lines
8.4 KiB
JavaScript
/*
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Copyright 2021-present The maxGraph project Contributors
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Copyright (c) 2006-2020, JGraph Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {
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Graph,
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InternalEvent,
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RubberBandHandler,
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Rectangle,
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Point,
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styleUtils,
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} from '@maxgraph/core';
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import { globalTypes } from '../.storybook/preview';
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export default {
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title: 'Backgrounds/ExtendCanvas',
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argTypes: {
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...globalTypes,
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contextMenu: {
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type: 'boolean',
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defaultValue: false,
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},
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rubberBand: {
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type: 'boolean',
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defaultValue: true,
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},
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},
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};
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const Template = ({ label, ...args }) => {
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const container = document.createElement('div');
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container.style.position = 'relative';
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container.style.overflow = 'auto';
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container.style.width = `${args.width}px`;
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container.style.height = `${args.height}px`;
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container.style.cursor = 'default';
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container.style.background = 'url(/images/grid.gif)';
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if (!args.contextMenu) InternalEvent.disableContextMenu(container);
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/**
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* Specifies the size of the size for "tiles" to be used for a graph with
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* scrollbars but no visible background page. A good value is large
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* enough to reduce the number of repaints that is caused for auto-
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* translation, which depends on this value, and small enough to give
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* a small empty buffer around the graph. Default is 400x400.
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*/
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const scrollTileSize = new Rectangle(0, 0, 400, 400);
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class MyCustomGraph extends Graph {
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/**
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* Returns the padding for pages in page view with scrollbars.
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*/
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getPagePadding() {
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return new Point(
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Math.max(0, Math.round(this.container.offsetWidth - 34)),
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Math.max(0, Math.round(this.container.offsetHeight - 34))
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);
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}
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/**
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* Returns the size of the page format scaled with the page size.
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*/
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getPageSize() {
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return this.pageVisible
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? new Rectangle(
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0,
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0,
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this.pageFormat.width * this.pageScale,
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this.pageFormat.height * this.pageScale
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)
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: scrollTileSize;
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}
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/**
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* Returns a rectangle describing the position and count of the
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* background pages, where x and y are the position of the top,
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* left page and width and height are the vertical and horizontal
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* page count.
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*/
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getPageLayout() {
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const size = this.pageVisible ? this.getPageSize() : scrollTileSize;
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const bounds = this.getGraphBounds();
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if (bounds.width === 0 || bounds.height === 0) {
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return new Rectangle(0, 0, 1, 1);
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}
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// Computes untransformed graph bounds
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const x = Math.ceil(bounds.x / this.view.scale - this.view.translate.x);
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const y = Math.ceil(bounds.y / this.view.scale - this.view.translate.y);
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const w = Math.floor(bounds.width / this.view.scale);
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const h = Math.floor(bounds.height / this.view.scale);
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const x0 = Math.floor(x / size.width);
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const y0 = Math.floor(y / size.height);
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const w0 = Math.ceil((x + w) / size.width) - x0;
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const h0 = Math.ceil((y + h) / size.height) - y0;
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return new Rectangle(x0, y0, w0, h0);
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}
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getPreferredPageSize(bounds, width, height) {
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const pages = this.getPageLayout();
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const size = this.getPageSize();
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return new Rectangle(0, 0, pages.width * size.width, pages.height * size.height);
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}
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sizeDidChange() {
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if (this.container != null && styleUtils.hasScrollbars(this.container)) {
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const pages = this.getPageLayout();
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const pad = this.getPagePadding();
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const size = this.getPageSize();
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// Updates the minimum graph size
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const minw = Math.ceil((2 * pad.x) / this.view.scale + pages.width * size.width);
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const minh = Math.ceil(
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(2 * pad.y) / this.view.scale + pages.height * size.height
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);
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const min = this.minimumGraphSize;
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// LATER: Fix flicker of scrollbar size in IE quirks mode
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// after delayed call in window.resize event handler
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if (min == null || min.width !== minw || min.height !== minh) {
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this.minimumGraphSize = new Rectangle(0, 0, minw, minh);
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}
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// Updates auto-translate to include padding and graph size
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const dx = pad.x / this.view.scale - pages.x * size.width;
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const dy = pad.y / this.view.scale - pages.y * size.height;
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if (
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!this.autoTranslate &&
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(this.view.translate.x !== dx || this.view.translate.y !== dy)
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) {
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this.autoTranslate = true;
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this.view.x0 = pages.x;
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this.view.y0 = pages.y;
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// NOTE: THIS INVOKES THIS METHOD AGAIN. UNFORTUNATELY THERE IS NO WAY AROUND THIS SINCE THE
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// BOUNDS ARE KNOWN AFTER THE VALIDATION AND SETTING THE TRANSLATE TRIGGERS A REVALIDATION.
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// SHOULD MOVE TRANSLATE/SCALE TO VIEW.
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const tx = this.view.translate.x;
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const ty = this.view.translate.y;
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this.view.setTranslate(dx, dy);
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this.container.scrollLeft += (dx - tx) * this.view.scale;
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this.container.scrollTop += (dy - ty) * this.view.scale;
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this.autoTranslate = false;
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return;
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}
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super.sizeDidChange();
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}
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}
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}
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// Creates the graph inside the given container
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const graph = new MyCustomGraph(container);
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const panningHandler = graph.getPlugin('PanningHandler');
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panningHandler.ignoreCell = true;
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graph.setPanning(true);
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// Fits the number of background pages to the graph
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graph.view.getBackgroundPageBounds = function () {
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const layout = this.graph.getPageLayout();
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const page = this.graph.getPageSize();
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return new Rectangle(
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this.scale * (this.translate.x + layout.x * page.width),
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this.scale * (this.translate.y + layout.y * page.height),
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this.scale * layout.width * page.width,
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this.scale * layout.height * page.height
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);
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};
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/**
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* Guesses autoTranslate to avoid another repaint (see below).
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* Works if only the scale of the graph changes or if pages
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* are visible and the visible pages do not change.
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*/
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const graphViewValidate = graph.view.validate;
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graph.view.validate = function () {
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if (this.graph.container != null && styleUtils.hasScrollbars(this.graph.container)) {
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const pad = this.graph.getPagePadding();
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const size = this.graph.getPageSize();
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// Updating scrollbars here causes flickering in quirks and is not needed
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// if zoom method is always used to set the current scale on the graph.
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const tx = this.translate.x;
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const ty = this.translate.y;
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this.translate.x = pad.x / this.scale - (this.x0 || 0) * size.width;
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this.translate.y = pad.y / this.scale - (this.y0 || 0) * size.height;
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}
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graphViewValidate.apply(this, arguments);
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};
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// Enables rubberband selection
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if (args.rubberBand) new RubberBandHandler(graph);
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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const parent = graph.getDefaultParent();
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// Adds cells to the model in a single step
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graph.batchUpdate(() => {
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const v1 = graph.insertVertex({
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parent,
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value: 'Hello,',
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position: [20, 20],
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size: [80, 30],
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});
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const v2 = graph.insertVertex({
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parent,
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value: 'World!',
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position: [200, 150],
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size: [80, 30],
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});
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const e1 = graph.insertEdge({
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parent,
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source: v1,
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target: v2,
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});
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});
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// Sets initial scrollbar positions
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window.setTimeout(() => {
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const bounds = graph.getGraphBounds();
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const width = Math.max(bounds.width, scrollTileSize.width * graph.view.scale);
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const height = Math.max(bounds.height, scrollTileSize.height * graph.view.scale);
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graph.container.scrollTop = Math.floor(
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Math.max(0, bounds.y - Math.max(20, (graph.container.clientHeight - height) / 4))
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);
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graph.container.scrollLeft = Math.floor(
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Math.max(0, bounds.x - Math.max(0, (graph.container.clientWidth - width) / 2))
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);
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}, 0);
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return container;
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};
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export const Default = Template.bind({});
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