<!--
Copyright (c) 2006-2013, JGraph Ltd
Hoverstyle example for mxGraph. This example shows hot to change
the style of a vertex on mouseover.
-->
<html>
<head>
<title>Hoverstyle 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">
// 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);
function updateStyle(state, hover)
{
if (hover)
{
state.style[mxConstants.STYLE_FILLCOLOR] = '#ff0000';
}
// Sets rounded style for both cases since the rounded style
// is not set in the default style and is therefore inherited
// once it is set, whereas the above overrides the default value
state.style[mxConstants.STYLE_ROUNDED] = (hover) ? '1' : '0';
state.style[mxConstants.STYLE_STROKEWIDTH] = (hover) ? '4' : '1';
state.style[mxConstants.STYLE_FONTSTYLE] = (hover) ? mxConstants.FONT_BOLD : '0';
};
// Changes fill color to red on mouseover
graph.addMouseListener(
{
currentState: null,
previousStyle: null,
mouseDown: function(sender, me)
{
if (this.currentState != null)
{
this.dragLeave(me.getEvent(), this.currentState);
this.currentState = null;
}
},
mouseMove: function(sender, me)
{
if (this.currentState != null && me.getState() == this.currentState)
{
return;
}
var tmp = graph.view.getState(me.getCell());
// Ignores everything but vertices
if (graph.isMouseDown || (tmp != null && !
graph.getModel().isVertex(tmp.cell)))
{
tmp = null;
}
if (tmp != this.currentState)
{
if (this.currentState != null)
{
this.dragLeave(me.getEvent(), this.currentState);
}
this.currentState = tmp;
if (this.currentState != null)
{
this.dragEnter(me.getEvent(), this.currentState);
}
}
},
mouseUp: function(sender, me) { },
dragEnter: function(evt, state)
{
if (state != null)
{
this.previousStyle = state.style;
state.style = mxUtils.clone(state.style);
updateStyle(state, true);
state.shape.apply(state);
state.shape.redraw();
if (state.text != null)
{
state.text.apply(state);
state.text.redraw();
}
}
},
dragLeave: function(evt, state)
{
if (state != null)
{
state.style = this.previousStyle;
updateStyle(state, false);
state.shape.apply(state);
state.shape.redraw();
if (state.text != null)
{
state.text.apply(state);
state.text.redraw();
}
}
}
});
// Enables rubberband selection
new mxRubberband(graph);
// 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,', 20, 20, 80, 30);
var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
var e1 = graph.insertEdge(parent, null, '', v1, v2);
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
}
};
</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');cursor:default;">
</div>
</body>
</html>