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238
static/mxgraph/examples/extendcanvas.html
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238
static/mxgraph/examples/extendcanvas.html
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<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Extend canvas example for mxGraph. This example demonstrates implementing
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an infinite canvas with scrollbars.
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-->
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<html>
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<head>
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<title>Extend canvas example for mxGraph</title>
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<!-- Sets the basepath for the library if not in same directory -->
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<script type="text/javascript">
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mxBasePath = '../src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="../src/js/mxClient.js"></script>
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<!-- Example code -->
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<script type="text/javascript">
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// Program starts here. Creates a sample graph in the
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// DOM node with the specified ID. This function is invoked
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// from the onLoad event handler of the document (see below).
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function main(container)
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{
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// Checks if the browser is supported
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if (!mxClient.isBrowserSupported())
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{
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// Displays an error message if the browser is not supported.
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mxUtils.error('Browser is not supported!', 200, false);
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}
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else
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{
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// Disables the built-in context menu
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mxEvent.disableContextMenu(container);
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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graph.panningHandler.ignoreCell = true;
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graph.setPanning(true);
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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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graph.scrollTileSize = new mxRectangle(0, 0, 400, 400);
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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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graph.getPagePadding = function()
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{
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return new mxPoint(Math.max(0, Math.round(graph.container.offsetWidth - 34)),
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Math.max(0, Math.round(graph.container.offsetHeight - 34)));
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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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graph.getPageSize = function()
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{
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return (this.pageVisible) ? new mxRectangle(0, 0, this.pageFormat.width * this.pageScale,
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this.pageFormat.height * this.pageScale) : this.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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graph.getPageLayout = function()
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{
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var size = (this.pageVisible) ? this.getPageSize() : this.scrollTileSize;
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var bounds = this.getGraphBounds();
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if (bounds.width == 0 || bounds.height == 0)
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{
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return new mxRectangle(0, 0, 1, 1);
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}
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else
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{
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// Computes untransformed graph bounds
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var x = Math.ceil(bounds.x / this.view.scale - this.view.translate.x);
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var y = Math.ceil(bounds.y / this.view.scale - this.view.translate.y);
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var w = Math.floor(bounds.width / this.view.scale);
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var h = Math.floor(bounds.height / this.view.scale);
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var x0 = Math.floor(x / size.width);
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var y0 = Math.floor(y / size.height);
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var w0 = Math.ceil((x + w) / size.width) - x0;
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var h0 = Math.ceil((y + h) / size.height) - y0;
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return new mxRectangle(x0, y0, w0, h0);
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}
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};
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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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{
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var layout = this.graph.getPageLayout();
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var page = this.graph.getPageSize();
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return new mxRectangle(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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graph.getPreferredPageSize = function(bounds, width, height)
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{
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var pages = this.getPageLayout();
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var size = this.getPageSize();
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return new mxRectangle(0, 0, pages.width * size.width, pages.height * size.height);
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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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var graphViewValidate = graph.view.validate;
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graph.view.validate = function()
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{
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if (this.graph.container != null && mxUtils.hasScrollbars(this.graph.container))
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{
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var pad = this.graph.getPagePadding();
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var 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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var tx = this.translate.x;
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var 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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var graphSizeDidChange = graph.sizeDidChange;
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graph.sizeDidChange = function()
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{
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if (this.container != null && mxUtils.hasScrollbars(this.container))
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{
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var pages = this.getPageLayout();
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var pad = this.getPagePadding();
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var size = this.getPageSize();
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// Updates the minimum graph size
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var minw = Math.ceil(2 * pad.x / this.view.scale + pages.width * size.width);
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var minh = Math.ceil(2 * pad.y / this.view.scale + pages.height * size.height);
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var min = graph.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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{
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graph.minimumGraphSize = new mxRectangle(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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var dx = pad.x / this.view.scale - pages.x * size.width;
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var dy = pad.y / this.view.scale - pages.y * size.height;
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if (!this.autoTranslate && (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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var tx = graph.view.translate.x;
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var ty = graph.view.translate.y;
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graph.view.setTranslate(dx, dy);
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graph.container.scrollLeft += (dx - tx) * graph.view.scale;
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graph.container.scrollTop += (dy - ty) * graph.view.scale;
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this.autoTranslate = false;
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return;
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}
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graphSizeDidChange.apply(this, arguments);
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}
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};
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// Enables rubberband selection
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new mxRubberband(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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var parent = graph.getDefaultParent();
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// Adds cells to the model in a single step
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graph.getModel().beginUpdate();
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try
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{
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var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);
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var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
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var e1 = graph.insertEdge(parent, null, '', v1, v2);
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}
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finally
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{
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// Updates the display
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graph.getModel().endUpdate();
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}
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// Sets initial scrollbar positions
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window.setTimeout(function()
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{
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var bounds = graph.getGraphBounds();
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var width = Math.max(bounds.width, graph.scrollTileSize.width * graph.view.scale);
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var height = Math.max(bounds.height, graph.scrollTileSize.height * graph.view.scale);
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graph.container.scrollTop = Math.floor(Math.max(0, bounds.y - Math.max(20, (graph.container.clientHeight - height) / 4)));
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graph.container.scrollLeft = Math.floor(Math.max(0, bounds.x - Math.max(0, (graph.container.clientWidth - width) / 2)));
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}, 0);
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}
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};
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</script>
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</head>
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<!-- Page passes the container for the graph to the program -->
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<body onload="main(document.getElementById('graphContainer'))">
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<!-- Creates a container for the graph with a grid wallpaper -->
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<div id="graphContainer"
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style="position:relative;overflow:auto;width:321px;height:241px;background:url('editors/images/grid.gif');cursor:default;">
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</div>
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</body>
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</html>
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