/*
        This example shows how to build an extremely dynamic Custom Property using 
        the PPG object. It appears in two parts: 
         * PART ONE writes the implementation to disk, loads it in Softimage, and
           then displays the property editor.
         * PART TWO is the code that implements the custom property
        Not only does the layout change but the actual underlying parameters are 
        rebuilt each time the Property Page is shown.
        Once this plugin is installed you can apply an instance of the custom 
        property via the Property Menu on the left side of the screen.  Then 
        each time you inspect the custom property it will regenerate its UI 
        so that there is a check box for each X3DObject parented under the scene 
        root.  You can pick which ones to select and then click apply.
        Normally a feature like this would probably be implemented as a custom 
        command that pops up a temporary, modal custom property which is deleted 
        after the fact.  However for the purpose of this example the custom 
        property remains in the scene for use whenever the user wants to change 
        selection.
        (This example was implemented by using the Custom Property wizard to 
        generate the initial plugin and then editing the code to add the dynamic 
        behavior)
*/
NewScene( null, false );
// ------------------------------------------------------------
//
//              PART ONE: Save Implementation to Disk and Open PPG
//
var filename = XSIUtils.BuildPath( Application.InstallationPath(siUserPath), 
        "Application", "Plugins", "DynParamDemo.js" );
// Write the contents of the Implementation functions below to DynParamDemo.js
var fso = new ActiveXObject( "Scripting.FileSystemObject" );
var ts = fso.CreateTextFile( filename, true );
ts.Write( XSILoadPlugin.toString() + "\n\n" );
ts.Write( DynParamDemo_Define.toString() + "\n\n" );
ts.Write( DynParamDemo_DefineLayout.toString() + "\n\n" );
ts.Write( DynParamDemo_OnInit.toString() + "\n\n" );
ts.Write( DynParamDemo_Apply_OnClicked.toString() );
ts.Close();
// Load the plugin 
Application.LoadPlugin( filename );
// Instantiate the custom property and display its property page
var oCustomProperty = Application.ActiveSceneRoot.AddProperty( "DynParamDemo" );
InspectObj( oCustomProperty );
// ------------------------------------------------------------
//
//              PART TWO: PPG Implementation
//
function XSILoadPlugin( in_reg )
{
        in_reg.Author = "Softimage";
        in_reg.Name = "DynParamDemoPlugin";
        in_reg.Major = 1;
        in_reg.Minor = 1;
        in_reg.RegisterProperty( "DynParamDemo" );
        return true;
}
function DynParamDemo_Define( io_Context )
{
        // No parameters are added here because we want the
        // data to be dynamic, see DynParamDemo_OnInit
}
function DynParamDemo_DefineLayout( io_Context )
{
        // Do nothing here because we want a dynamic layout.
        // The work is done inside DynParamDemo_OnInit instead.
}
function DynParamDemo_OnInit()
{
        // This example doesn't make sense in the case
        // of selection of more than one instance of the custom
        // property at a time, so we only look at the first inspected
        var oCustomProperty = PPG.Inspected.Item(0);
        // Remove any existing parameters
        for ( var i=oCustomProperty.Parameters.Count-1; i>=0; i-- ) {
                oCustomProperty.RemoveParameter( oCustomProperty.Parameters.Item(i) );
        }
        var oLayout = PPG.PPGLayout;
        oLayout.Clear();
        var oSceneChildren = Application.ActiveSceneRoot.Children; 
        for ( var j=0; j<oSceneChildren.Count; j++ ) {
                var oChild = oSceneChildren.Item(j);
                // Add a boolean parameter to represent this object
                oCustomProperty.AddParameter2( oChild.Name, siBool, false,
                                null, null, null, null, 0, siPersistable );
                // Put this in the layout
                oLayout.AddItem( oChild.Name, "Select " + oChild.Name );                
        }
        oLayout.AddButton( "Apply" );
        PPG.Refresh();
}
function DynParamDemo_Apply_OnClicked()
{
        DeselectAll(); // Call Softimage Command
        var oCustomProperty = PPG.Inspected.Item(0);
        for ( var j=0; j<oCustomProperty.Parameters.Count; j++ ) {
                var oParam = oCustomProperty.Parameters.Item(j);
                if ( oParam.Value == true ) {
                        // We used a naming sceme for the parameters that matches the object    
                        AddToSelection( oParam.Name );  // Call Softimage Command
                }
        }
}