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330
static/mxgraph/examples/serverview.html
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330
static/mxgraph/examples/serverview.html
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<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Server-View example for mxGraph. This example demonstrates using
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a server-side image of the graph as the diagram in the client. This
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may be used to improve drawing-speed in older browser and on devices
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with slower processors.
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-->
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<html>
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<head>
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<title>mxGraph using Server-side Image</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 = '/mxgraph/javascript/src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="/mxgraph/javascript/src/js/mxClient.js"></script>
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<!-- Overrides certain methods required for the server-side-image to be used. -->
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<script type="text/javascript">
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// Makes the background of the in-place editor non-transparent
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var previousStartEditing = mxCellEditor.prototype.startEditing;
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mxCellEditor.prototype.startEditing = function (cell, trigger)
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{
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previousStartEditing.apply(this, arguments);
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var state = this.graph.getView().getState(cell);
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if (state != null)
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{
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var color = mxUtils.getValue(state.style, mxConstants.STYLE_FILLCOLOR, 'white');
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this.textarea.style.background = color;
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}
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};
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// Replaces the event firing mechanism in the graph view since there are
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// no longer any DOM elements that fire events for the actual states we
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// have to find the state under the mouse using graph.getCellAt and then
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// fire the event for the state from here instead.
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// FIXME: Since we do not render the label we don't have the label bounds
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// here which means hit detection will only work for the vertex bounds,
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// the edge but not for overlapping labels or most part of the edge labels.
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mxGraphView.prototype.installListeners = function()
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{
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var graph = this.graph;
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var container = graph.container;
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if (container != null)
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{
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mxEvent.addGestureListeners(container,
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mxUtils.bind(this, function(evt)
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{
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var pt = mxUtils.convertPoint(graph.container,
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mxEvent.getClientX(evt), mxEvent.getClientY(evt));
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var cell = graph.getCellAt(pt.x, pt.y);
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var state = this.getState(cell);
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if (state != null)
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{
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graph.fireMouseEvent(mxEvent.MOUSE_DOWN,
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new mxMouseEvent(evt, state));
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}
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// Condition to avoid scrollbar events starting a rubberband
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// selection
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else if (this.isContainerEvent(evt) &&
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((!mxClient.IS_IE &&
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!mxClient.IS_GC && !mxClient.IS_OP && !mxClient.IS_SF) ||
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!this.isScrollEvent(evt)))
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{
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graph.fireMouseEvent(mxEvent.MOUSE_DOWN,
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new mxMouseEvent(evt));
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}
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}),
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mxUtils.bind(this, function(evt)
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{
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var pt = mxUtils.convertPoint(graph.container,
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mxEvent.getClientX(evt), mxEvent.getClientY(evt));
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var cell = graph.getCellAt(pt.x, pt.y);
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var state = this.getState(cell);
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if (state != null)
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{
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graph.fireMouseEvent(mxEvent.MOUSE_MOVE,
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new mxMouseEvent(evt, state));
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}
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else if (this.isContainerEvent(evt))
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{
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graph.fireMouseEvent(mxEvent.MOUSE_MOVE,
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new mxMouseEvent(evt));
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}
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}),
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mxUtils.bind(this, function(evt)
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{
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var pt = mxUtils.convertPoint(graph.container,
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mxEvent.getClientX(evt), mxEvent.getClientY(evt));
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var cell = graph.getCellAt(pt.x, pt.y);
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var state = this.getState(cell);
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if (state != null)
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{
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graph.fireMouseEvent(mxEvent.MOUSE_UP,
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new mxMouseEvent(evt, state));
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}
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else if (this.isContainerEvent(evt))
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{
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graph.fireMouseEvent(mxEvent.MOUSE_UP,
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new mxMouseEvent(evt));
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}
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}));
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// Adds listener for double click handling on background
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mxEvent.addListener(container, 'dblclick',
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mxUtils.bind(this, function(evt)
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{
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var pt = mxUtils.convertPoint(graph.container,
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mxEvent.getClientX(evt), mxEvent.getClientY(evt));
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var cell = graph.getCellAt(pt.x, pt.y);
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graph.dblClick(evt, cell);
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})
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);
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// Adds basic listeners for graph event dispatching outside of the
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// container and finishing the handling of a single gesture
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mxEvent.addGestureListeners(document,
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mxUtils.bind(this, function(evt)
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{
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if (this.isContainerEvent(evt))
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{
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graph.popupMenuHandler.hideMenu();
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}
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}),
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mxUtils.bind(this, function(evt)
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{
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// Hides the tooltip if mouse is outside container
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if (graph.tooltipHandler != null &&
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graph.tooltipHandler.isHideOnHover())
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{
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graph.tooltipHandler.hide();
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}
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if (this.captureDocumentGesture &&
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graph.isMouseDown &&
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!mxEvent.isConsumed(evt))
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{
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graph.fireMouseEvent(mxEvent.MOUSE_MOVE,
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new mxMouseEvent(evt));
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}
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}),
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mxUtils.bind(this, function(evt)
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{
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if (this.captureDocumentGesture)
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{
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graph.fireMouseEvent(mxEvent.MOUSE_UP,
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new mxMouseEvent(evt));
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}
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})
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);
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}
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};
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</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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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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// Holds the current image
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var img = null;
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var loader = new Image();
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loader.src = 'images/loading.gif';
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loader.style.zIndex = 1;
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loader.style.visibility = 'hidden';
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loader.style.position = 'absolute';
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graph.container.insertBefore(loader, graph.container.firstChild);
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// Disables the DOM-based rendering in the graph and updates the
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// display image on each validation step using the Export servlet
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// on the graph
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graph.view.rendering = false;
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// Installs a post-validation repaint of the complete graph
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graph.view.validate = function()
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{
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loader.style.left = graph.container.scrollLeft + graph.container.clientWidth / 2 - 32;
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loader.style.top = graph.container.scrollTop + graph.container.clientHeight / 2 - 32;
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loader.style.visibility = 'visible';
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mxGraphView.prototype.validate.apply(this, arguments);
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var t0 = new Date().getTime();
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var bounds = graph.getGraphBounds();
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// Note that we send out an XML version of the view which
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// allows us to keep most customizations on the client-side.
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// No deltas are used here, the complete view is sent to the
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// server on each update.
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var node = mxUtils.getViewXml(graph, 1);
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var xml = encodeURIComponent(mxUtils.getXml(node));
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var onload = function(req)
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{
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var dt = (new Date().getTime() - t0) / 1000;
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//mxLog.debug('post returned after '+dt+' secs');
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if (req.getStatus() == 200)
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{
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var image =new Image();
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// Disable DnD events on images in IE. FIXME: Rubberband
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// events are ignored in IE when starting on the image.
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if (mxClient.IS_IE)
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{
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graph.view.isContainerEvent = function(evt)
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{
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var source = mxEvent.getSource(evt);
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return (source == image ||
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source == this.graph.container ||
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source.parentNode == this.backgroundPane ||
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(source.parentNode != null &&
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source.parentNode.parentNode == this.backgroundPane) ||
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source == this.canvas.parentNode ||
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source == this.canvas ||
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source == this.backgroundPane ||
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source == this.drawPane ||
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source == this.overlayPane);
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};
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}
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// Less flickering if the old image is removed after
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// the new image was received from the server
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image.onload = function()
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{
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if (img != null)
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{
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img.parentNode.removeChild(img);
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}
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img = image;
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graph.container.insertBefore(img, graph.container.firstChild);
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loader.style.visibility = 'hidden';
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var dt = (new Date().getTime() - t0) / 1000;
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//mxLog.debug('received '+img.clientWidth+'x'+img.clientHeight+' pixels in '+dt+' secs');
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graph.setEnabled(true);
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};
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// URL contains timestamp to avoid caching in the browser
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image.src = '/ServerView?'+new Date().getTime();
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image.style.position = 'absolute';
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image.style.left = bounds.x - 4;
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image.style.top = bounds.y - 4;
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image.style.zIndex = -1;
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}
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};
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var onerror = function(req)
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{
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//mxLog.debug('error: '+req.getStatus());
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}
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//mxLog.debug('sent '+(xml.length/1024)+' KB');
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graph.setEnabled(false);
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new mxXmlRequest('/ServerView', 'xml='+xml).send(onload, onerror);
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};
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// Uncomment the following if you want the container
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// to fit the size of the graph
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//graph.setResizeContainer(true);
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// Enables rubberband selection
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new mxRubberband(graph);
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graph.setConnectable(true);
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graph.setPanning(true);
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graph.setTooltips(true);
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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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//mxLog.show();
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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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}
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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="overflow:auto;width:500px;height:500px;border: black solid 1px;cursor:default;">
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</div>
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<br>
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<strong>Important:</strong>
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<p>
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To use this example, start com.mxgraph.examples.web.Main in Java
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and point your<br>browser to:
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<a href="http://localhost:8080/mxgraph/javascript/examples/serverview.html">http://localhost:8080/mxgraph/javascript/examples/serverview.html</a>
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</p>
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</body>
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</html>
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