<!--
Copyright (c) 2006-2013, JGraph Ltd
Second label example for mxGraph. This example demonstrates how to
add another string label to vertices.
-->
<html>
<head>
<title>Second label example for mxGraph</title>
<!-- Sets the basepath for the library if not in same directory -->
<script type="text/javascript">
mxBasePath = '../src';
</script>
<!-- Loads and initializes the library -->
<script type="text/javascript" src="../src/js/mxClient.js"></script>
<!-- Example code -->
<script type="text/javascript">
// Simple solution to add additional text to the rectangle shape definition:
(function()
{
var mxRectangleShapeIsHtmlAllowed = mxRectangleShape.prototype.isHtmlAllowed;
mxRectangleShape.prototype.isHtmlAllowed = function()
{
return mxRectangleShapeIsHtmlAllowed.apply(this, arguments) && this.state == null;
};
mxRectangleShapePaintForeground = mxRectangleShape.prototype.paintForeground;
mxRectangleShape.prototype.paintForeground = function(c, x, y, w, h)
{
if (this.state != null && this.state.cell.geometry != null && !this.state.cell.geometry.relative)
{
c.setFontColor('#a0a0a0');
c.text(x + 2, y, 0, 0, this.state.cell.id, 'left', 'top');
}
mxRectangleShapePaintForeground.apply(this, arguments);
};
})();
// Program starts here. Creates a sample graph in the
// DOM node with the specified ID. This function is invoked
// from the onLoad event handler of the document (see below).
function main(container)
{
// Checks if the browser is supported
if (!mxClient.isBrowserSupported())
{
// Displays an error message if the browser is not supported.
mxUtils.error('Browser is not supported!', 200, false);
}
else
{
// Creates the graph inside the given container
var graph = new mxGraph(container);
// Disables the folding icon
graph.isCellFoldable = function(cell)
{
return false;
}
var secondLabelVisible = true;
// Hook for returning shape number for a given cell
graph.getSecondLabel = function(cell)
{
if (!this.model.isEdge(cell))
{
// Possible to return any string here
return 'The ID of this cell is ' + cell.id;
}
return null;
};
var relativeChildVerticesVisible = true;
// Overrides method to hide relative child vertices
graph.isCellVisible = function(cell)
{
return !this.model.isVertex(cell) || cell.geometry == null ||
!cell.geometry.relative ||
cell.geometry.relative == relativeChildVerticesVisible;
};
// Creates the shape for the shape number and puts it into the draw pane
var redrawShape = graph.cellRenderer.redrawShape;
graph.cellRenderer.redrawShape = function(state, force, rendering)
{
var result = redrawShape.apply(this, arguments);
if (result && secondLabelVisible && state.cell.geometry != null && !state.cell.geometry.relative)
{
var secondLabel = graph.getSecondLabel(state.cell);
if (secondLabel != null && state.shape != null && state.secondLabel == null)
{
state.secondLabel = new mxText(secondLabel, new mxRectangle(),
mxConstants.ALIGN_LEFT, mxConstants.ALIGN_BOTTOM);
// Styles the label
state.secondLabel.color = 'black';
state.secondLabel.family = 'Verdana';
state.secondLabel.size = 8;
state.secondLabel.fontStyle = mxConstants.FONT_ITALIC;
state.secondLabel.background = 'yellow';
state.secondLabel.border = 'black';
state.secondLabel.valign = 'bottom';
state.secondLabel.dialect = state.shape.dialect;
state.secondLabel.dialect = mxConstants.DIALECT_STRICTHTML;
state.secondLabel.wrap = true;
graph.cellRenderer.initializeLabel(state, state.secondLabel);
}
}
if (state.secondLabel != null)
{
var scale = graph.getView().getScale();
var bounds = new mxRectangle(state.x + state.width - 8 * scale, state.y + 8 * scale, 35, 0);
state.secondLabel.state = state;
state.secondLabel.value = graph.getSecondLabel(state.cell);
state.secondLabel.scale = scale;
state.secondLabel.bounds = bounds;
state.secondLabel.redraw();
}
return result;
};
// Destroys the shape number
var destroy = graph.cellRenderer.destroy;
graph.cellRenderer.destroy = function(state)
{
destroy.apply(this, arguments);
if (state.secondLabel != null)
{
state.secondLabel.destroy();
state.secondLabel = null;
}
};
graph.cellRenderer.getShapesForState = function(state)
{
return [state.shape, state.text, state.secondLabel, state.control];
};
// Gets the default parent for inserting new cells. This
// is normally the first child of the root (ie. layer 0).
var parent = graph.getDefaultParent();
// Adds cells to the model in a single step
graph.getModel().beginUpdate();
try
{
var v1 = graph.insertVertex(parent, null, 'Hello,', 30, 40, 80, 30);
// Alternative solution of creating a second label by creating a realtive child vertex
// with size (0, 0). This will not be selectable and only the label colors can be used
// for coloring as the actual shape will have zero size.
var v11 = graph.insertVertex(v1, null, 'World', 1, 1, 0, 0, 'align=left;verticalAlign=top;labelBackgroundColor=red;labelBorderColor=black', true);
v11.geometry.offset = new mxPoint(-8, -8);
var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
// Another alternative solution of creating a second label as a relative child vertex
// but this time with an automatic size so that the cell is actually selectable and
// the background is painted as a shape.
var v21 = graph.insertVertex(v2, null, 'World', 1, 1, 0, 0, 'align=left;verticalAlign=top;fillColor=red;rounded=1;spacingLeft=4;spacingRight=4', true);
v21.geometry.offset = new mxPoint(-8, -8);
graph.updateCellSize(v21);
var e1 = graph.insertEdge(parent, null, '', v1, v2);
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
// Adds a button to execute the layout
document.body.insertBefore(mxUtils.button('Toggle Child Vertices',
function(evt)
{
relativeChildVerticesVisible = !relativeChildVerticesVisible;
graph.refresh();
}
), document.body.firstChild);
// Adds a button to execute the layout
document.body.insertBefore(mxUtils.button('Toggle IDs',
function(evt)
{
secondLabelVisible = !secondLabelVisible;
graph.refresh();
}
), document.body.firstChild);
}
};
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">
<!-- Creates a container for the graph with a grid wallpaper -->
<div id="graphContainer"
style="position:relative;overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif')">
</div>
</body>
</html>