SILVERLIGHT USER INTERFACE CONTROLS in Visual Basic .NET

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SILVERLIGHT USER INTERFACE CONTROLS
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Table 3-20. Key Properties of the System.Windows.Controls.RichTextBox Class
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BlockCollection
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Gets the content of the RichTextBox. The BlockCollection includes collection of the entered Paragraph elements. Controls how/when the horizontal scrollbar is displayed. Possible values: Disabled (scrollbar never appears); Auto (scrollbar appears when content cannot be fully displayed within the bounds); Hidden (like Disabled, but the dimension of the content is not set to the viewport s size); and Visible (scrollbar is always visible). Defines if the rich text area is read-only or the user can change the content. The default value is false. The programmatic changes are allowed in the read-only mode. Inserted UIElements (XAML) and hyperlinks are active only in the read-only mode. The user can still perform selection of the text and get the cursor in the read-only mode. Also KeyUp and KeyDown events are marked as handled by default. Gets the selected text within the RichTextBox. Controls whether text wraps when it reaches the edge of the text box. Possible values: Wrap, NoWrap. Controls how/when a vertical scrollbar is displayed. See HorizontalScrollBarVisibility for possible values.
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HorizontalScrollBar Visibility
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ScrollBarVisibility
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IsReadOnly
bool
Selection TextWrapping
TextSelection TextWrapping
VerticalScrollBar Visibility
ScrollBarVisibility
The Paragraph class (of the System.Windows.Documents namespace) is usually used to group different types of content and present them as a block. The Paragraph element can host simple text and Inline elements such as InlineUIContainer (for XAML UI element and images), Run (string of formatted or unformatted text), Span (to group other Inline content elements), Bold (format text as bold font weight), Hyperlink (to host hyperlinks), Italic (format text as italic font style), and Underline (decorate text as underlined text). Figure 3-15 shows a very basic example of the use of the RichTextBox control containing simple text, formatted text, an inline image, and a Grid panel. Here we have used Paragraph elements to group the block of content and a LineBreak element to create a new line.
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Figure 3-15. The RichTextBox control example Here s the corresponding XAML: <RichTextBox TextWrapping="Wrap" IsReadOnly="False"> <Paragraph> This is Paragraph 1. </Paragraph> <Paragraph FontSize="16" TextAlignment="Right" FontFamily="Courier New"> <Underline> This is right aligned formatted paragraph <LineBreak/> Second formatted line </Underline> </Paragraph> <Paragraph> This is inline image.. <InlineUIContainer> <Image Source="res/5.jpg" Height="150" Width="200" Stretch="UniformToFill"/> </InlineUIContainer> </Paragraph> <Paragraph> <LineBreak/> Inserting Grid Panel to the RichTextBox <LineBreak/> <InlineUIContainer> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions>
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<Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Border Grid.Row="0" Grid.Column="0" Background="Beige"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Row = 0, Column = 0"/> </Border> <Border Grid.Row="0" Grid.Column="1" Background="BurlyWood"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Row = 0, Column = 1"/> </Border> <Border Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Background="DarkKhaki"> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" > <TextBlock Text="Row = 0, Column = 1"/> <TextBlock HorizontalAlignment="Center" Text="ColumnSpan = 2"/> </StackPanel> </Border> </Grid> </InlineUIContainer> </Paragraph> </RichTextBox>
AutoCompleteBox
The AutoCompleteBox control provides the ability to automatically show a drop-down list of items that match the partial input into a text box by a user. For example, if the AutoCompleteBox contains the items Blue, Red, Green, and Black and the user types B, a drop-down box will appear displaying Blue and Black. It is also possible to perform custom filtering on the AutoCompleteBox, making this control quite flexible. Although this control contains items (the data for the autocompletion), it is technically not an ItemsControl. Creating a simple AutoCompleteBox in your user interface is a matter of placing the control in the XAML and specifying the data source used for the autocompletion possibilities, like so: <UserControl x:Class="chapter3.AutoCompleteBoxDemo" 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/markupcompatibility/2006" mc:Ignorable="d" xmlns:input="clr-namespace:System.Windows.Controls; assembly=System.Windows.Controls.Input" d:DesignHeight="300" d:DesignWidth="400">
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<StackPanel x:Name="LayoutRoot" Background="White"> <TextBlock Text="Choose a state"/> <input:AutoCompleteBox x:Name="stateSelection" Width="175" HorizontalAlignment="Left"/> </StackPanel> </UserControl> Notice that this control is in a different assembly than the other controls in this chapter: System.Windows.Controls.Input, which is referenced at the UserControl level. You also need to add a reference to the project. The constructor for this page creates a List<string> that is used to supply a list of states in the United States to the autocompletion box: List<string> stateList = new List<string>(); stateList.Add("Alabama"); stateList.Add("Alaska"); // ... stateList.Add("Wisconsin"); stateList.Add("Wyoming"); stateSelection.ItemsSource = stateList; Figure 3-16 shows this control in action after the user types A.
Figure 3-16. The AutoCompleteBox control example Table 3-21 shows the key properties of the AutoCompleteBox control, and Table 3-22 describes its key events. Table 3-21. Key Properties of the System.Windows.Controls.AutoCompleteBox Class
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