barcode label printing in vb.net SILVERLIGHT INTRODUCTION in VB.NET

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SILVERLIGHT INTRODUCTION
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System.Windows.Documents; System.Windows.Ink; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;
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namespace 14.HelloSilverlight { public class PageNavigator { private static Grid RootLayoutElement; static PageNavigator() { RootLayoutElement = Application.Current.RootVisual as Grid; } public static void LoadPage(UserControl NewControl) { //Get reference to old control var OldUserControl = RootLayoutElement.Children[0] as UserControl; //Add new control RootLayoutElement.Children.Add(NewControl); //Remove old control RootLayoutElement.Children.Remove(OldUserControl); } } }
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Creating a Silverlight User Control
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You will now create a menu page with a number of buttons to take you to the examples you will create: 1. 2. 3. 4. Right-click the 14.HelloSilverlight solution and select Add New Item. Select Silverlight User Control. Enter the name MainMenu. Note that at the top of the XAML code is a control declaration: <UserControl x:Class="14.HelloSilverlight.MainMenu"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
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d:DesignHeight="300" d:DesignWidth="400">
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SILVERLIGHT INTRODUCTION
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You want the menu control to span the whole page, so remove this code: d:DesignHeight="300" d:DesignWidth="400 5. Enter the following XAML inside the LayoutRoot Grid to create buttons to navigate to the test pages: <TextBlock FontSize="40" Canvas.Left="200" Canvas.Top="25" >Silverlight Demo</TextBlock> <StackPanel Canvas.Left="300" Canvas.Top="150" Orientation="Vertical" VerticalAlignment="Top"> <Button x:Name="cmdStackPanel" Content="Stack Panel"></Button> <Button x:Name="cmdGrid" Content="Grid"></Button> <Button x:Name="cmdAnimation" Content="Animation"></Button> <Button x:Name="cmdCallJS" Content="Call JS"></Button> <Button x:Name="cmdMediaTest" Content="Media"></Button> <Button x:Name="cmdDataBind" Content="Data Binding"></Button> </StackPanel> Okay, nearly done. But when the Silverlight application is first loaded, you want to load MainMenu.xaml rather than MainPage.xaml. You can do this by editing a file called App.xaml.
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App.xaml
App.xaml handles global events in a manner similar to Global.asax. Open ~/App.xaml.cs. By default, App.xaml.cs has code such as the following: private void Application_Startup(object sender, StartupEventArgs e) { this.RootVisual = new MainPage(); } This loads the MainPage.xaml file when the application starts. You want to alter this to load the MainMenu.xaml file instead. Change the Application_startup method to the following: private void Application_Startup(object sender, StartupEventArgs e) { Grid root = new Grid(); root.Children.Add(new MainMenu()); this.RootVisual = root; }
Styles
Silverlight allows you to define set styles for objects in a manner that is a cross between CSS and ASP.NET themes. You will create a simple style that will format the page title on the menu page.
SILVERLIGHT INTRODUCTION
6. 7.
Open up ~/App.xaml. Inside the <Application.Resources> block, enter the following: <Style x:Key="MyStyle" TargetType="TextBlock"> <Setter Property="FontFamily" Value="Comic Sans MS"/> <Setter Property="FontSize" Value="54"/> <Setter Property="Foreground" Value="#FF0000FF"/> </Style>
Now go back to MainMenu.xaml and find the line where it says the following: <TextBlock FontSize="40" Canvas.Left="200" Canvas.Top="25">Silverlight Demo</TextBlock>
Add the following attribute to this tag to reference the style you created in App.xaml: Style="{StaticResource MyStyle}"
Your tag should now look like this: <TextBlock FontSize="40" Canvas.Left="200" Canvas.Top="25" Style="{StaticResource MyStyle}">Silverlight Demo</TextBlock>
APPLICATION.RESOURCES
The Application.Resources section allows you to hold much more complex styles than you have just created. It can be used to hold pretty much any set of properties you might want to reuse. For example, you could include colors, gradients, or even control templates.
Positioning Elements
One of the most confusing parts of Silverlight and WPF is element positioning. When you start working with Silverlight and WPF, it is quite common to find yourself wondering why an element is not displaying. This is normally due to the following: You haven t set the width or height. Your element is obscured by another element. You have positioned the element off the screen. Your element is transparent.
Silverlight positions elements using two axes running from the top-left corner of the screen called Left (horizontal axis) and Top (vertical axis). The top-left corner is referred to as coordinates 0, 0 (see Figure 14-6).
SILVERLIGHT INTRODUCTION
Figure 14-6. Silverlight screen coordinates system You are probably expecting to be able to position elements in Silverlight similar to the following code: <TextBlock Left="10" Top="20"></TextBlock> However, elements are positioned using the Canvas.Left and Canvas.Top properties (unless positioned through some other means such as a Grid): <TextBlock Canvas.Left="10" Canvas.Top="20"></TextBlock> Canvas.Left and Canvas.Top are a special type of property called an attached property. The Left and Top properties are actually attached to the Canvas element. This means you are positioning the TextBlock relative to the Canvas element. This is an important concept to understand and brings you to the subject of attached and dependency properties.
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