356 lines
10 KiB
HTML
356 lines
10 KiB
HTML
<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Clipboard example for mxGraph. This example demonstrates using the
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clipboard for providing cross-tab and cross-browser copy and paste.
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-->
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<html>
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<head>
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<title>Clipboard 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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// Public helper method for shared clipboard.
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mxClipboard.cellsToString = function(cells)
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{
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var codec = new mxCodec();
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var model = new mxGraphModel();
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var parent = model.getChildAt(model.getRoot(), 0);
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for (var i = 0; i < cells.length; i++)
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{
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model.add(parent, cells[i]);
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}
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return mxUtils.getXml(codec.encode(model));
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};
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// Focused but invisible textarea during control or meta key events
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var textInput = document.createElement('textarea');
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mxUtils.setOpacity(textInput, 0);
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textInput.style.width = '1px';
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textInput.style.height = '1px';
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var restoreFocus = false;
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var gs = graph.gridSize;
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var lastPaste = null;
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var dx = 0;
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var dy = 0;
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// Workaround for no copy event in IE/FF if empty
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textInput.value = ' ';
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// Shows a textare when control/cmd is pressed to handle native clipboard actions
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mxEvent.addListener(document, 'keydown', function(evt)
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{
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// No dialog visible
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var source = mxEvent.getSource(evt);
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if (graph.isEnabled() && !graph.isMouseDown && !graph.isEditing() && source.nodeName != 'INPUT')
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{
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if (evt.keyCode == 224 /* FF */ || (!mxClient.IS_MAC && evt.keyCode == 17 /* Control */) || (mxClient.IS_MAC && evt.keyCode == 91 /* Meta */))
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{
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// Cannot use parentNode for check in IE
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if (!restoreFocus)
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{
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// Avoid autoscroll but allow handling of events
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textInput.style.position = 'absolute';
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textInput.style.left = (graph.container.scrollLeft + 10) + 'px';
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textInput.style.top = (graph.container.scrollTop + 10) + 'px';
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graph.container.appendChild(textInput);
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restoreFocus = true;
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textInput.focus();
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textInput.select();
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}
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}
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}
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});
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// Restores focus on graph container and removes text input from DOM
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mxEvent.addListener(document, 'keyup', function(evt)
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{
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if (restoreFocus && (evt.keyCode == 224 /* FF */ || evt.keyCode == 17 /* Control */ ||
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evt.keyCode == 91 /* Meta */))
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{
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restoreFocus = false;
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if (!graph.isEditing())
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{
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graph.container.focus();
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}
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textInput.parentNode.removeChild(textInput);
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}
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});
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// Inserts the XML for the given cells into the text input for copy
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var copyCells = function(graph, cells)
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{
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if (cells.length > 0)
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{
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var clones = graph.cloneCells(cells);
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// Checks for orphaned relative children and makes absolute
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for (var i = 0; i < clones.length; i++)
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{
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var state = graph.view.getState(cells[i]);
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if (state != null)
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{
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var geo = graph.getCellGeometry(clones[i]);
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if (geo != null && geo.relative)
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{
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geo.relative = false;
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geo.x = state.x / state.view.scale - state.view.translate.x;
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geo.y = state.y / state.view.scale - state.view.translate.y;
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}
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}
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}
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textInput.value = mxClipboard.cellsToString(clones);
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}
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textInput.select();
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lastPaste = textInput.value;
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};
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// Handles copy event by putting XML for current selection into text input
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mxEvent.addListener(textInput, 'copy', mxUtils.bind(this, function(evt)
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{
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if (graph.isEnabled() && !graph.isSelectionEmpty())
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{
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copyCells(graph, mxUtils.sortCells(graph.model.getTopmostCells(graph.getSelectionCells())));
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dx = 0;
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dy = 0;
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}
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}));
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// Handles cut event by removing cells putting XML into text input
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mxEvent.addListener(textInput, 'cut', mxUtils.bind(this, function(evt)
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{
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if (graph.isEnabled() && !graph.isSelectionEmpty())
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{
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copyCells(graph, graph.removeCells());
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dx = -gs;
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dy = -gs;
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}
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}));
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// Merges XML into existing graph and layers
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var importXml = function(xml, dx, dy)
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{
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dx = (dx != null) ? dx : 0;
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dy = (dy != null) ? dy : 0;
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var cells = []
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try
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{
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var doc = mxUtils.parseXml(xml);
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var node = doc.documentElement;
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if (node != null)
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{
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var model = new mxGraphModel();
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var codec = new mxCodec(node.ownerDocument);
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codec.decode(node, model);
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var childCount = model.getChildCount(model.getRoot());
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var targetChildCount = graph.model.getChildCount(graph.model.getRoot());
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// Merges existing layers and adds new layers
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graph.model.beginUpdate();
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try
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{
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for (var i = 0; i < childCount; i++)
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{
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var parent = model.getChildAt(model.getRoot(), i);
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// Adds cells to existing layers if not locked
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if (targetChildCount > i)
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{
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// Inserts into active layer if only one layer is being pasted
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var target = (childCount == 1) ? graph.getDefaultParent() : graph.model.getChildAt(graph.model.getRoot(), i);
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if (!graph.isCellLocked(target))
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{
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var children = model.getChildren(parent);
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cells = cells.concat(graph.importCells(children, dx, dy, target));
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}
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}
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else
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{
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// Delta is non cascading, needs separate move for layers
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parent = graph.importCells([parent], 0, 0, graph.model.getRoot())[0];
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var children = graph.model.getChildren(parent);
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graph.moveCells(children, dx, dy);
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cells = cells.concat(children);
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}
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}
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}
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finally
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{
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graph.model.endUpdate();
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}
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}
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}
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catch (e)
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{
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alert(e);
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throw e;
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}
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return cells;
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};
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// Parses and inserts XML into graph
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var pasteText = function(text)
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{
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var xml = mxUtils.trim(text);
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var x = graph.container.scrollLeft / graph.view.scale - graph.view.translate.x;
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var y = graph.container.scrollTop / graph.view.scale - graph.view.translate.y;
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if (xml.length > 0)
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{
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if (lastPaste != xml)
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{
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lastPaste = xml;
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dx = 0;
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dy = 0;
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}
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else
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{
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dx += gs;
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dy += gs;
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}
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// Standard paste via control-v
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if (xml.substring(0, 14) == '<mxGraphModel>')
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{
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graph.setSelectionCells(importXml(xml, dx, dy));
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graph.scrollCellToVisible(graph.getSelectionCell());
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}
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}
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};
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// Cross-browser function to fetch text from paste events
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var extractGraphModelFromEvent = function(evt)
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{
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var data = null;
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if (evt != null)
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{
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var provider = (evt.dataTransfer != null) ? evt.dataTransfer : evt.clipboardData;
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if (provider != null)
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{
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if (document.documentMode == 10 || document.documentMode == 11)
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{
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data = provider.getData('Text');
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}
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else
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{
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data = (mxUtils.indexOf(provider.types, 'text/html') >= 0) ? provider.getData('text/html') : null;
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if (mxUtils.indexOf(provider.types, 'text/plain' && (data == null || data.length == 0)))
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{
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data = provider.getData('text/plain');
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}
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}
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}
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}
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return data;
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};
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// Handles paste event by parsing and inserting XML
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mxEvent.addListener(textInput, 'paste', function(evt)
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{
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// Clears existing contents before paste - should not be needed
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// because all text is selected, but doesn't hurt since the
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// actual pasting of the new text is delayed in all cases.
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textInput.value = '';
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if (graph.isEnabled())
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{
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var xml = extractGraphModelFromEvent(evt);
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if (xml != null && xml.length > 0)
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{
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pasteText(xml);
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}
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else
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{
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// Timeout for new value to appear
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window.setTimeout(mxUtils.bind(this, function()
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{
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pasteText(textInput.value);
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}), 0);
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}
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}
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textInput.select();
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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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}
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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:hidden;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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