The Tree Model sample is a subclass of IlvDiagrammerApplication. It therefore has
the full application facilities as described in Customizing the predefined application.
The Data model
To load the
TreeSDMModel
object, the sample overrides the createDiagrammer method to perform extra
operations, see the following code example.
protected IlvDiagrammer createDiagrammer()
{
// Create a default tree model. The JTree creates one
// if you don't specify a model: let's use it.
//
TreeModel treeModel = new JTree().getModel();
// Create the IlvDiagrammer instance.
//
IlvDiagrammer diagrammer = super.createDiagrammer();
// Create a default tree model. The JTree creates one
The sample creates an instance of
TreeSDMModel
, giving it a default tree model as a parameter, see the
following code example.
// Create the Tree -> SDM model adapter.
//
TreeSDMModel sdmModel = new TreeSDMModel(treeModel);
The sample then gets the SDM engine for the IlvDiagrammer instance and sets the data
model to the
TreeSDMModel
instance, as shown in the following code example.
// Tell the IlvDiagrammer to use this model:
//
diagrammer.getEngine().setModel(sdmModel);
return diagrammer;
}
The style sheet
The style sheet used to display the tree model
is located in <installdir>/jviews-diagrammer810/codefragments/datamodel/treemodel/data.
To load the style sheet, you pass the
relative path to the sample as a startup argument.
public TreeModelDemo()
{
super(new String[]{
"-title", "Tree Model Demo",
"-style", "data/tree.css",
});
}
The style sheet specifies a Tree layout in
Radial mode with various parameters, in the two rules shown in
the following code example.
SDM {
GraphLayout : "Tree" ;
}
GraphLayout {
flowDirection : "Bottom";
layoutMode : "RADIAL";
globalLinkStyle : "ORTHOGONAL_STYLE";
position : "300,200";
parentChildOffset : "10";
siblingOffset : "10";
}
The style sheet also specifies the colors
of the various objects.
Note that the
CSSclass
property of the
TreeSDMNode
class is recognized automatically by the CSS engine as specifying
a CSS class because of its name, and
therefore the values of this attribute can be used directly in
rules. This allows you to set colors at the level of types of
object with a simple syntax, see the following code example.
node.food {
fillColor2 : "lightgreen" ;
}
// node.treenode[userObject='food'] node.treenode {
// fillColor2 : "lightgreen" ;
// }
The comment lines show the alternative, longer way to set the
color for food objects. This longer way relies on a parent-child
construct in CSS for Java. Note that the parent-child
construct is not supported in the Designer.