Version 8.2 (2013-03-18)
 —  Special Development Topics  —

Microsoft Silverlight Integration

Microsoft Silverlight is a plug-in which allows to specify sophisticated graphics, such as animations. It is positioned as competitive plug-in to Adobe's Macromedia Flash control. Silverlight runs within Microsoft-based and Apple-OS-based systems. As browsers, the Internet Explorer, Mozilla and Safari are supported.

This document assumes that you already know how to deal with Silverlight. Read the documentation that comes with the Silverlight SDK when downloading from Microsoft.

The integration of Silverlight is simple and straight forward. Silverlight has direct access to JavaScript processing - this is where AJAX and Silverlight meet.

Using Application Designer's control concept, the Silverlight part of a page can be nicely integrated, allowing the AJAX page to pass data ("net data") to the Silverlight control and allowing the Silverlight processing to set data and raise events within the AJAX processing.

Notes:

  1. Silverlight is bound to certain platforms (Windows, Mac OS). It is up to you to decide whether you should use it or not.
  2. Silverlight is not supported in Application Designer's SWT client. Silverlight is browser-specific, the main reason being the communication between the Silverlight plug-in and the surrounding environment. In the browser, the binding is done using JavaScript. For SWT, no standard binding is offered.
  3. The Silverlight plug-in only supports a subset of Microsoft's XAML definitions. The subset definition is documented as part of the SDK that you can download from Microsoft.

This document covers the following topics:


Example

The following page contains three special controls: two buttons and an image area.

Example

As you can see in the layout tree, the names of the corresponding control tags are SL_BUTTON and SL_IMAGEOUT. These controls are animated:

From the layout perspective, the controls are just normal controls. The button is bound to a server-side method, the image output area is bound to a server-side property. The control's complexity is completely hidden from of the application developer who just uses controls by dropping them into a page and putting server-side logic behind them.

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Implementation of the Sample Page

The layout of the above sample page is defined in the following way:

<page model="SL_Test1Adapter">
    <sl_silverlight>
    </sl_silverlight>
    <titlebar name="Template">
    </titlebar>
    <pagebody paddingleft="20" paddingright="20" paddingtop="20" paddingbottom="20">
        <itr>
            <label name="First Name" width="120">
            </label>
            <field valueprop="firstName" width="200">
            </field>
        </itr>
        <itr>
            <label name="Last Name" width="120">
            </label>
            <field valueprop="lastName" width="200">
            </field>
        </itr>
        <vdist height="10">
        </vdist>
        <itr>
            <hdist width="120">
            </hdist>
            <sl_button name="Save" method="onSave">
            </sl_button>
        </itr>
        <vdist>
        </vdist>
        <itr>
            <hdist width="120">
            </hdist>
            <sl_button name="Tschüss!" method="onBye">
            </sl_button>
        </itr>
        <vdist height="10">
        </vdist>
        <itr takefullwidth="true">
            <textgrid2 griddataprop="images" width="100%" height="100%" selectprop="selected" singleselect="true" onclickmethod="onSelectImage">
                <column name="Image Name" property="imageName" width="100%">
                </column>
            </textgrid2>
            <hdist width="10">
            </hdist>
            <sl_imageout valueprop="image" width="300" height="300">
            </sl_imageout>
        </itr>
    </pagebody>
    <statusbar withdistance="false">
    </statusbar>
</page>

In the above layout, the following types of tags are used that are specific to Silverlight. These are customized controls.

The adapter implementation looks as follows:

// This class is a generated one.

import java.util.*;

import com.softwareag.cis.file.FileManager;
import com.softwareag.cis.server.*;
import com.softwareag.cis.server.util.*;
import com.softwareag.cis.util.*;

public class SL_Test1Adapter
    extends Adapter
{
    String m_firstName;
    public String getFirstName() { return m_firstName; }
    public void setFirstName(String value) { m_firstName = value; }

    String m_lastName;
    public String getLastName() { return m_lastName; }
    public void setLastName(String value) { m_lastName = value; }
    
    String m_image;
    public String getImage() { return m_image; }
    public void setImage(String value) { m_image = value; }

    public class ImagesItem
    {
        // property >imageName<
        String m_imageName;
        public String getImageName() { return m_imageName; }
        public void setImageName(String value) { m_imageName = value; }

        // property >selected<
        boolean m_selected;
        public boolean getSelected() { return m_selected; }
        public void setSelected(boolean value) { m_selected = value; }
    }

    TEXTGRIDCollection m_images = new TEXTGRIDCollection();
    public TEXTGRIDCollection getImages() { return m_images; }

    public void init()
    {
        String dirName = Params.getApplicationDirectoryName("playground") + "images/";
        String[] images = FileManager.getFileNamesOfDiretory(dirName,".jpg");
        for (int i=0; i<images.length; i++)
        {
            ImagesItem ii = new ImagesItem();
            ii.setImageName(images[i]);
            m_images.add(ii);
        }
    }
    
    public void onSelectImage()
    {
        ImagesItem ii = (ImagesItem)m_images.findLastSelectedItem();
        m_image = "../playground/images/"+ii.getImageName();
    }

    public void onBye()
    {
        outputMessage(MT_SUCCESS,"Bye was pressed!");
    }

    public void onSave()
    {
        outputMessage(MT_SUCCESS,"Save was pressed!");
    }
}

The adapter code does not contain any items which are specific to Silverlight. The important items in the code are:

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Integration of Silverlight

The descriptions below are based on the following structure:

/HTMLBasedGUI/
             /silverlight/
                         /createSilverlight.js
                         /Silverlight.js
                         /SL_BUTTON.xaml
                         /SL_IMAGEOUT.xaml

There is an /HTMLBasedGUI/silverlight directory in which the following files are kept:

This example introduces new control handlers for the SL_* controls .

Note:
The selection of the HTMLBasedGUI directory for keeping the silverlight directory was done because HTMLBasedGUI is can be considered as Software AG's "home directory" within a web application. When doing your own implementation, you can choose any directory of your choice that is part of the web application's directory.

The customized controls are described below:

SL_SILVERLIGHT Control

Editor Extension File

Let us first have a look at the editor extension file that defines the control's integration into the Layout Painter.

<?xml version="1.0" encoding="UTF-8"?>

<!--
Dynamic extension of editor.xml file.
-->

<controllibrary>
  <editor>

  <!--
  ********************************************************************
  * TAGs
  ********************************************************************
  -->

  <!--SILVERLIGHT -->
  <tag name="silverlight">
  </tag>
  <tagsubnodeextension control="page" newsubnode="silverlight"/>

  </editor>
</controllibrary>

The definition is pretty simple. The tag will appear in the controls palette of the Layout Painter, as a new section with the name "Silverlight". The control does not have any properties.

Control Handler

The control adds some JavaScript statements into the generated HTML of a page. Have a look at the implementation for the control handler:

package com.softwareag.cis.gui.generate;

import org.xml.sax.AttributeList;

import com.softwareag.cis.gui.protocol.ProtocolItem;

public class SL_SILVERLIGHTHandler
    implements ITagHandler
{
    // ------------------------------------------------------------------------
    // public usage
    // ------------------------------------------------------------------------
    
    public void generateHTMLForStartTag(int id,
                                        String tagName,
                                        AttributeList attrlist,
                                        ITagHandler[] handlersAbove,
                                        StringBuffer sb,
                                        ProtocolItem protocolItem)
    {
        sb.append("<!-- SILVERLIGHT begin -->\n");
        sb.append("<script type=\"text/javascript\" src=\"../HTMLBasedGUI/silverlight/Silverlight.js\"></script>\n");
        sb.append("<script type=\"text/javascript\" src=\"../HTMLBasedGUI/silverlight/createSilverlight.js\"></script>\n");
    }

    public void generateHTMLForEndTag(String tagName, StringBuffer sb)
    {
        sb.append("<!-- SILVERLIGHT end  -->\n");
    }

    public void generateJavaScriptForInit(int id,
                                          String tagName,
                                          StringBuffer sb)
    {
    }

}

This implementation only contains the integration of the .js files which are stored in the /HTMLBasedGUI/silverlight directory.

SL_BUTTON

The handling of the button is done in several parts.

Editor Extension File

Let us first have a look at the editor extension file that defines the control's integration in the Layout Painter.

<?xml version="1.0" encoding="UTF-8"?>

<!--
Dynamic extension of editor.xml file.
-->

<controllibrary>
  <editor>

  <!--
  ********************************************************************
  * TAGs
  ********************************************************************
  -->

  <!-- SL_BUTTON -->
  <tag name="sl_button">
    <attribute name="name"/>
    <attribute name="method"/>
    <attribute name="width" datatype="width"/>
    <attribute name="height" datatype="height"/>
  </tag>
  <tagsubnodeextension control="itr" newsubnode="sl_button"/>
  <tagsubnodeextension control="tr" newsubnode="sl_button"/>
  <taggroupsubnodeextension group="Silverlight" newsubnode="sl_button"/>

  </editor>
</controllibrary>

The control has four attributes. name, width and height are used to specify the button's rendering. method defines the binding to an adapter method.

In the controls palette of the Layout Painter, the control will appear within the section Silverlight. It can be placed below ITR and TR row containers.

Control Handler

The SL_BUTTON tag handler class is responsible for generating the HTML:

package com.softwareag.cis.gui.generate;

import org.xml.sax.AttributeList;

import com.softwareag.cis.gui.protocol.Message;
import com.softwareag.cis.gui.protocol.ProtocolItem;

public class SL_BUTTONHandler 
    implements ITagHandler
{
    // ------------------------------------------------------------------------
    // members
    // ------------------------------------------------------------------------
    
    String m_name = "";
    String m_method;
    String m_width = "100";
    String m_height= "21";

    // ------------------------------------------------------------------------
    // public usage
    // ------------------------------------------------------------------------
    
    public void generateHTMLForStartTag(int id,
                                        String tagName,
                                        AttributeList attrlist,
                                        ITagHandler[] handlersAbove,
                                        StringBuffer sb,
                                        ProtocolItem protocolItem)
    {
        readAttributes(attrlist);
        fillProtocol(protocolItem);
        generateXSD(protocolItem);
        // create HTML
        sb.append("<!-- SL_BUTTON begin -->\n");
        sb.append("<td width='"+m_width+"'><div id='C"+id+"'"+
                  " style='width:"+m_width+"; height:"+m_height+"'/></td>\n");
        sb.append("<script>function onButtonPressed"+id+"()"+
                  " { C.invokeMethodInModel('"+m_method+"'); }</script>");
    }

    public void generateHTMLForEndTag(String tagName, StringBuffer sb)
    {
        sb.append("<!-- SL_BUTTON end -->\n");
    }

    public void generateJavaScriptForInit(int id,
                                          String tagName,
                                          StringBuffer sb)
    {
        sb.append("if (firstusage) C_"+id+" = document.getElementById('C"+id+"');\n");
        sb.append("if (firstusage) createMySilverlightControl('../HTMLBasedGUI/silverlight/SL_BUTTON.xaml',C_"+id+",'"+id+"','"+m_width+"','"+m_height+"');\n");
        sb.append("if (firstusage) C_"+id+".CASA_width='"+m_width+"';\n");
        sb.append("if (firstusage) C_"+id+".CASA_method='"+m_method+"';\n");
        sb.append("if (firstusage) C_"+id+".CASA_name='"+m_name+"';\n");
    }

    // ------------------------------------------------------------------------
    // private usage
    // ------------------------------------------------------------------------
    
    /** */
    private void readAttributes(AttributeList attrlist)
    {
        for (int i=0; i<attrlist.getLength(); i++)
        {
            if (attrlist.getName(i).equals("name")) m_name = attrlist.getValue(i);
            if (attrlist.getName(i).equals("method")) m_method = attrlist.getValue(i);
            if (attrlist.getName(i).equals("width")) m_width = attrlist.getValue(i);
            if (attrlist.getName(i).equals("height")) m_height = attrlist.getValue(i);
        }
    }
    
    /** */
    private void fillProtocol(ProtocolItem pi)
    {
        pi.addMethod(m_method);
    }
    
    /** */
    private void generateXSD(ProtocolItem pi)
    {
        XSDGenerationAddon xga = (XSDGenerationAddon)pi.findGenerationAddon(XSDGenerationAddon.class);
        if (xga != null)
        {
            xga.addMethod(pi,m_method);
        }
    }
    
}

The above code does the following:

The control is rendered and Silverlight is invoked.

XAML File

Let us now have a look at the XAML file that is passed as parameter. The XAML file is the XML definition which defines the layout of what is rendered inside the Silverlight control:

<Canvas 
   xmlns="http://schemas.microsoft.com/client/2007"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<Canvas Canvas.Top="0" 
        Canvas.Left="0" 
        Width="100"
        Height="21"
        Loaded="onLoadedBUTTON">
    <Canvas Canvas.Top="0" 
          Canvas.Left="0" 
          Width="100" 
          Height="21"
          x:Name="lllll"
          MouseLeftButtonDown="onMouseLeftButtonDownBUTTON">
        <Canvas.Resources>
            <Storyboard x:Name="button_flip">
                <DoubleAnimation
                    Storyboard.TargetName="lllllscale"
                    Storyboard.TargetProperty="ScaleY"
                    From="1.0" To="-1.0" Duration="0:0:0.400" AutoReverse="True"/>
            </Storyboard>
        </Canvas.Resources>
        <!-- Content Begin -->
        <Rectangle Canvas.Top="0"
                   Canvas.Left="0"
                   Width="100"
                   Height="21"
                   Stroke="#808080"
                   StrokeThickness="1"
                   RadiusX="10"
                   RadiusY="10"
                   Cursor="Hand">
            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Color="#E0E0E0" Offset="0.0" />
                    <GradientStop Color="#A0A0A0" Offset="1.0" />
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        <TextBlock Text="" 
                   FontSize="12" 
                   Canvas.Top="1" 
                   Canvas.Left="10"
                   Cursor="Hand"
                   x:Name="text1"/>
        <TextBlock Text="" 
                   FontSize="12" 
                   Canvas.Top="22" 
                   Canvas.Left="10"
                   Height="5"
                   Cursor="Hand"
                   x:Name="text2">
            <TextBlock.Foreground>
                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Color="#B0B0B0" Offset="0.0" />
                    <GradientStop Color="#606060" Offset="1.0" />
                </LinearGradientBrush>
            </TextBlock.Foreground>
            <TextBlock.RenderTransform>
                <ScaleTransform ScaleX="1" ScaleY="-0.6"/>
            </TextBlock.RenderTransform>
        </TextBlock>
        <!-- Content End -->
        <Canvas.RenderTransform>
            <ScaleTransform x:Name="lllllscale" ScaleX="1" ScaleY="1" CenterY="10"/>
        </Canvas.RenderTransform>
    </Canvas>
</Canvas>

</Canvas>

If this is the first XAML definition that you see, it may look confusing. But in the end, it is quite simple what happens:

JavaScript

Finally, there is some JavaScript that plays a role: one canvas contains an event handler MouseLeftButtonDown which calls a method onMouseLeftButtonDownBUTTON. The implementation of this method is done in the file creatSilverlight.js. This is the file from which the control was created.

function onMouseLeftButtonDownBUTTON(sender,eventArgs)
{
    var control = sender.getHost();
    var params = control.initParams;
    // animation
    var flippig = control.content.findName("button_flip");
    flippig.begin();
    // invoke button function
    var methodName = "onButtonPressed"+params;
    var method = window[methodName];
    method();
}

The following happens:

There is one thing left which was not mentioned yet: the setting of the button's text. This is done through the following JavaScript implementation:

function onLoadedBUTTON(sender,eventArgs)
{
   var control = sender.getHost();   
   var params = control.initParams;
   var cc = window["C_"+params];
    var text1 = control.content.findName("text1");
    text1.text = cc.CASA_name;
    var text2 = control.content.findName("text2");
    text2.text = cc.CASA_name;
    var taw = text1.actualWidth;
    var centeredX = 50 - taw/2;
    text1["Canvas.Left"] = centeredX;
    text2["Canvas.Left"] = centeredX;
}

This is called when the button is loaded inside the Silverlight control. It picks the method name and passes it to the text blocks within the XAML definition.

SL_IMAGEOUT

The implementation of SL_IMAGEOUT is similar to that of SL_BUTTON.

Editor Extension File

This is the control's editor extension file:

<?xml version="1.0" encoding="UTF-8"?>

<!--
Dynamic extension of editor.xml file.
-->

<controllibrary>
  <editor>

  <!--
  ********************************************************************
  * TAGs
  ********************************************************************
  -->

  <!-- SL_SLIMAGEOUT -->
  <tag name="sl_imageout">
    <attribute name="valueprop"/>
    <attribute name="width" datatype="width"/>
    <attribute name="height" datatype="height"/>
    <taginstance/>
    <protocolitem/>
  </tag>
  <tagsubnodeextension control="itr" newsubnode="sl_imageout"/>
  <tagsubnodeextension control="tr" newsubnode="sl_imageout"/>
  <taggroupsubnodeextension group="Silverlight" newsubnode="sl_imageout"/>

  </editor>
</controllibrary>

The control defines three attributes. width and height are used to set the image dimension. valueprop is used to bind the image's URL to an adapter property.

In the controls palette of the Layout Painter, the control will appear within the section Silverlight. It can be placed below ITR and TR row containers.

Control Handler

This is the tag handler implementation:

package com.softwareag.cis.gui.generate;

import org.xml.sax.AttributeList;

import com.softwareag.cis.gui.protocol.ProtocolItem;

public class SL_IMAGEOUTHandler implements ITagHandler
{
    String m_valueprop;
    String m_width = "300";
    String m_height= "300";

    // ------------------------------------------------------------------------
    // public usage
    // ------------------------------------------------------------------------
    
    public void generateHTMLForStartTag(int id,
                                        String tagName,
                                        AttributeList attrlist,
                                        ITagHandler[] handlersAbove,
                                        StringBuffer sb,
                                        ProtocolItem protocolItem)
    {
        readAttributes(attrlist);
        fillProtocol(protocolItem);
        generateXSD(protocolItem);
        // create HTML
        sb.append("<!-- SL_IMAGEOUT begin -->\n");
        sb.append("<td width='"+m_width+"'><div id='C"+id+"' style='width:"+m_width+"; height:"+m_height+"'/></td>\n");
        sb.append("<script>\n");
        sb.append("var s_vv"+id+" = 'inittini';\n");
        sb.append("function romu"+id+"()\n");
        sb.append("{\n");
        sb.append(  "var vv = C.getPropertyValue('"+m_valueprop+"');\n");
        sb.append(  "if (vv == s_vv"+id+") return;\n");
        sb.append(  "s_vv"+id+" = vv;\n");
        sb.append(  "displayImageIMAGEOUT(C"+id+",vv);\n");
        sb.append("}\n");
        sb.append("</script>\n");
    }

    public void generateHTMLForEndTag(String tagName, StringBuffer sb)
    {
        sb.append("<!-- SL_IMAGEOUT end -->\n");
    }

    public void generateJavaScriptForInit(int id,
                                          String tagName,
                                          StringBuffer sb)
    {
        sb.append("if (firstusage) C_"+id+" = document.getElementById('C"+id+"');\n");
        sb.append("if (firstusage) C_"+id+".CASA_width='"+m_width+"';\n");
        sb.append("if (firstusage) C_"+id+".CASA_valueprop='"+m_valueprop+"';\n");
        sb.append("if (firstusage) C_"+id+".CASA_width='"+m_width+"';\n");
        sb.append("if (firstusage) C_"+id+".CASA_height='"+m_height+"';\n");
        sb.append("if (firstusage) createMySilverlightControl('../HTMLBasedGUI/silverlight/SL_IMAGEOUT.xaml',C_"+id+",'"+id+"','"+m_width+"','"+m_height+"');\n");
        sb.append("if (firstusage) C.registerListener(romu"+id+");\n");
    }

    // ------------------------------------------------------------------------
    // private usage
    // ------------------------------------------------------------------------
    
    /** */
    private void readAttributes(AttributeList attrlist)
    {
        for (int i=0; i<attrlist.getLength(); i++)
        {
            if (attrlist.getName(i).equals("valueprop")) m_valueprop = attrlist.getValue(i);
            if (attrlist.getName(i).equals("width")) m_width = attrlist.getValue(i);
            if (attrlist.getName(i).equals("height")) m_height = attrlist.getValue(i);
        }
    }
    
    /** */
    private void fillProtocol(ProtocolItem pi)
    {
        pi.addProperty(m_valueprop);
    }
    
    /** */
    private void generateXSD(ProtocolItem pi)
    {
        XSDGenerationAddon xga = (XSDGenerationAddon)pi.findGenerationAddon(XSDGenerationAddon.class);
        if (xga != null)
        {
            xga.addSimpleData(pi,m_valueprop);
        }
    }
    
}

This is similar to SL_BUTTON. However, there is a romuxxx function generated and registered via C.registerListener(). This function is called every time a response is processed within the client. Inside the method, the data that was updated by the response is checked whether it contains a new image to be displayed in the control.

Now, let us have a look at the XAML implementation:

<Canvas 
   xmlns="http://schemas.microsoft.com/client/2007"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   Loaded="loadedIMAGEOUT">

        <Canvas.Resources>
            <Storyboard x:Name="thestoryboard1"
                        Completed="completedIMAGEOUT">
                <DoubleAnimation
                    Storyboard.TargetName="tr"
                    Storyboard.TargetProperty="Angle"
                    From="0.0" To="45" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="ScaleX"
                    From="1" To="0" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="ScaleY"
                    From="1" To="0" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="CenterY"
                    From="0" To="500" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="CenterX"
                    From="0" To="500" Duration="0:0:0.400" AutoReverse="False"/>
            </Storyboard>
            <Storyboard x:Name="thestoryboard2">
                <DoubleAnimation
                    Storyboard.TargetName="tr"
                    Storyboard.TargetProperty="Angle"
                    From="45" To="0" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="ScaleX"
                    From="0" To="1" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="ScaleY"
                    From="0" To="1" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="CenterY"
                    From="500" To="0" Duration="0:0:0.400" AutoReverse="False"/>
                <DoubleAnimation
                    Storyboard.TargetName="ts"
                    Storyboard.TargetProperty="CenterX"
                    From="500" To="0" Duration="0:0:0.400" AutoReverse="False"/>
            </Storyboard>
        </Canvas.Resources>
        
        <Rectangle Canvas.Top="0"
                   Canvas.Left="0"
                   Width="300"
                   Height="300"
                   Stroke="#606060"
                   StrokeThickness="1"
                   RadiusX="10"
                   RadiusY="10">
            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Color="#E0E0E0" Offset="0.0" />
                    <GradientStop Color="#909090" Offset="1.0" />
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        
        
        <Canvas Canvas.Top="10"
                Canvas.Left="10"
                Width="280"
                Height="280">
            <Rectangle Canvas.Top="0"
                       Canvas.Left="0"
                       Width="280"
                       Height="280"
                       Cursor="Hand">
                <Rectangle.Fill>
                    <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                        <GradientStop Color="#808080" Offset="0.0" />
                        <GradientStop Color="#000000" Offset="1.0" />
                    </LinearGradientBrush>
                </Rectangle.Fill>
            </Rectangle>
            <Canvas Canvas.Top="0"
                    Canvas.Left="0"
                    Width="280"
                    Height="280">
                <Canvas.Background>
                    <ImageBrush x:Name="imagebrush" ImageSource="../HTMLBasedGUI/silverlight/SL_IMAGEOUT_empty.jpg" />
                </Canvas.Background>
                <Canvas.RenderTransform>
                    <TransformGroup>
                    <ScaleTransform x:Name="ts" ScaleX="1" ScaleY="1" CenterY="0"/>
                    <RotateTransform x:Name="tr" Angle="0"/>
                    </TransformGroup>
                </Canvas.RenderTransform>
            </Canvas>
        </Canvas>
        
</Canvas>

There is a set of canvas definitions (see the screenshot at the very beginning of this document: the image is embedded in some kind of frame). The most important one is located at the bottom: it uses an "ImageBrush" in order to paint its content (this means: an image appears in the content).

There is a set of animations (two storyboards) which define that the image rolls out and in by doing a scale transformation and a rotate transformation simultaneously.

The following is the JavaScript code which does the binding from JavaScript to Silverlight:

function displayImageIMAGEOUT(cc,imageName)
{
	if (imageName == null || imageName == "") 
	{
		return;
	}
	cc.CASA_imageName = imageName;
	if (cc.CASA_control == undefined) // not yet initialized
	{
		return;
	}
	var control = cc.CASA_control;
	// start the hide storyboard
    var tsb = control.content.findName("thestoryboard1");
    tsb.begin();
}

function loadedIMAGEOUT(sender,args)
{
    var control = sender.getHost();
	var params = control.initParams;
	var cc = window["C_"+params];
	cc.CASA_control = control;
	if (cc.CASA_imageName != null)
		displayImageIMAGEOUT(cc,cc.CASA_imageName);
}

function completedIMAGEOUT(sender,args)
{
    var control = sender.getHost();
	var params = control.initParams;
	var cc = window["C_"+params];
    var ib = control.content.findName("imagebrush");
    ib.imageSource = cc.CASA_imageName;
    var tsb = control.content.findName("thestoryboard2");
    tsb.begin();
}

When a new image needs to be displayed, the displayImageIMAGEOUT method is called. This is the one which is referenced by the romuxxx method which itself is called when a response is processed on the client side.

The displayImageIMAGEOUT method triggers the animation thestoryboard1. This animation takes the current image out (that is: it rotates and shrinks it). At the end of the animation, an event is raised which then calls the function completedIMAGEOUT. In the completedIMAGEOUT method, the new image is defined in the brush, and the animation is started to roll the new image in.

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