RE: Silverlight fruit basket program developed without Visual Studio
- From: Katherine Moss <Katherine.Moss@xxxxxxxxxx>
- To: "programmingblind@xxxxxxxxxxxxx" <programmingblind@xxxxxxxxxxxxx>
- Date: Wed, 18 May 2011 03:25:25 +0000
That's really cool. And I'm going to try it out tomorrow after my final. I've
seen various issues depending on which Silverlight app I'm using, but I think
that the difference between accessibility or not with Silverlight is the
labeling factor. At least that's what happens on the Microsoft site. But I've
also heard that the use of Silverlight can be problematic due to it's lack of
cross-platform support. Everybody correct me if I'm wrong.
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jamal Mazrui
Sent: Tuesday, May 17, 2011 10:58 PM
To: blindwebbers@xxxxxxxxxxxxxxx; programmingblind; Program-l
Subject: Silverlight fruit basket program developed without Visual Studio
From the archive
http://EmpowermentZone.com/sl_fruit.zip
This fruit basket program is developed with C# and Microsoft Silverlight. The
archive in zip format, FruitBasket.xap, is hosted in a web page,
FruitBasket.htm, which serves as a wrapper for the app. The Silverlight 4
runtime is required on the client computer. Supported web browsers include
Internet Explorer, Firefox, and Safari.
The free Silverlight 4 SDK is available from the web site http://silverlight.net
The batch file build.bat invokes the C# compiler of the .NET Framework 4 to
produce the assembly FruitBasket.dll from the source code FruitBasket.cs. The
response file, Silverlight.rsp, directs the compiler to build with Silverlight
components rather than desktop components of the .NET Framework. The The free
7z.exe utility then creates FruitBasket.xap from FruitBasket.dll and
AppManifest.xaml. That XML file tells the Silverlight runtime what assembly
and type will be the entry point of the app. The batch file finally opens the
FruitBasket.htm with the default browser for testing the app.
One surprise about the Silverlight API was the absense of a property for
specifying the default button in a form. Programmatically clicking a button
was also more involved than expected. Some additional code was thus needed so
that the Enter key in the edit box would invoke the Add button.
Otherwise, however, this fruit basket program was deliberately coded in a
minimalist manner in order to highlight the key ingrediants of a Silverlight
app without extraneous clutter. A Visual Studio project of the same
functionality contains significantly more files, code, and complexity. Of
course, an IDE also has benefits, but this shows that it is possible to develop
Silverlight apps with a text editor and command-line tools.
A large collection of text tutorials about Silverlight development (and the
dynamic languages IronPython and IronRuby) is available at
http://EmpowermentZone.com/sl_doc.zip
Screen readers vary significantly in their client-side support for Silverlight
accessibility, which is based on an API called User Interface Automation (UIA).
It may be necessary to manually turn off a virtual or browse mode in order to
interact with the app. To try it, open the embedding HTML file, either locally
after unzipping the archive, or via the following web address:
http://EmpowermentZone.com/FruitBasket.htm
The archive will soon be available on
http://FruitBasketDemos.org
For convenient reference, the FruitBasket.cs code is also pasted below.
Jamal Mazrui
/*
Fruit basket program in Silverlight without Visual Studio Public domain by
Jamal Mazrui May 17, 2011 */
// Import namespaces
using System;
using System.Net;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using System.Windows.Automation.Provider;
using System.Windows.Browser;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Xml;
// Define namespace
namespace FruitBasket {
// Define class
public class App: Application {
// Define entry point of program
public App() {
this.Startup += HandleStartup;
} // App Constructor
void HandleStartup(object sender, StartupEventArgs eventArgs) { // Create
controls; var lblFruit = new TextBlock {Text = "Fruit:"}; var txtFruit = new
TextBox(); var btnAdd = new Button {Content = "Add"}; var lblBasket = new
TextBlock {Text = "Basket:"}; var lstBasket = new ListBox{IsTabStop = true};
var btnDelete = new Button {Content = "Delete"};
// Define Add event handler;
btnAdd.Click += (o, e) => {
var sFruit = txtFruit.Text;
if (sFruit == "") MessageBox.Show("Alert - No fruit to add!"); else {
lstBasket.Items.Add(sFruit); txtFruit.Text = ""; lstBasket.SelectedIndex =
lstBasket.Items.Count - 1; } };
// Define Delete event handler;
btnDelete.Click += (o,e) => {
var iFruit = lstBasket.SelectedIndex;
if (iFruit == -1) MessageBox.Show("Alert - No fruit to delete!"); else {
lstBasket.Items.RemoveAt(iFruit); if (iFruit == lstBasket.Items.Count)
iFruit--; if (iFruit >=0) lstBasket.SelectedIndex = iFruit; } };
// Make Enter in the TextBox invoke the Add button txtFruit.KeyDown += (o, e)
=> { if (e.Key == Key.Enter) { var peer = new ButtonAutomationPeer(btnAdd); var
provider = (IInvokeProvider) peer; provider.Invoke(); } };
// Complete layout
// Horizontal panel with TextBox and Add button var pnlAdd = new StackPanel
{Orientation = Orientation.Horizontal}; foreach (var widget in new UIElement[]
{lblFruit, txtFruit, btnAdd}) pnlAdd.Children.Add(widget);
// Horizontal panel with ListBox and Delete button var pnlDelete = new
StackPanel {Orientation = Orientation.Horizontal}; foreach (var widget in new
UIElement[] {lblBasket, lstBasket,
btnDelete}) pnlDelete.Children.Add(widget);
// Vertical panel containing the two horizontal panels var pnlMain = new
StackPanel {Orientation = Orientation.Vertical}; foreach (var widget in new
UIElement[] {pnlAdd, pnlDelete}) pnlMain.Children.Add(widget);
// Set the RootVisual container of the app, and initial focus to the TextBox
this.RootVisual = pnlMain; txtFruit.Focus(); } // Handlestartup method } // App
class } // FruitBasket namespace __________ View the list's information and
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