ItemContainerStyle Style in VB.NET

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The TreeViewItem Class
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The most interesting functionality for the TreeView is provided by the TreeViewItem class. This class inherits from the HeaderedItemsControl (which is detailed in the next section), so it has the ability to store a header and content separately. Table 3-28 describes its properties, and Table 3-29 describes its events. Table 3-28. Properties of the System.Windows.Controls.TreeViewItem Class
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HasItems IsExpanded IsSelected IsSelectionActive
Type
bool bool bool bool
Description
Returns true if this TreeViewItem has items and false otherwise. Returns true if this TreeViewItem is expanded and false otherwise. Returns true if this TreeViewItem is selected and false otherwise. Returns true if this TreeViewItem has focus and false otherwise.
Table 3-29. Events of the System.Windows.Controls.TreeViewItem Class
Event
Collapsed Expanded Selected Unselected
Description
Occurs when the value of IsExpanded is changed from true to false. Occurs when the value of IsExpanded is changed from false to true. Occurs when the value of IsSelected is changed from false to true. Occurs when the value of IsSelected is changed from true to false.
SILVERLIGHT USER INTERFACE CONTROLS
HeaderedItemsControl
The HeaderedItemsControl provides a straightforward way to display a list of items with a header area. Figure 3-20 shows what this control looks like when displaying a few color names from a string array (via data binding, which we ll look at in 6). No selection is supported with this control (combine a ListBox with a HeaderedContentControl to accomplish selection).
Figure 3-20. The HeaderedItemsControl example Table 3-30 defines the key properties of the HeaderedItemsControl class. Table 3-30. Key Properties of the System.Windows.Controls.HeaderedItemsControl Class
Property
Header HeaderTemplate
Type
object DataTemplate
Description
Specifies what is used as content for the header. Specifies the date template used to dynamically supply data for the header. See 6 for details. Specifies the style of the container around each item. See 8 for details about styles.
ItemContainerStyle Style
The XAML used to render the HeaderedItemsControl in Figure 3-18 provides a static header, and the items are supplied in the code-behind: <UserControl x:Class="chapter3. HeaderedItemsControlDemo" 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" xmlns:c="clr-namespace:System.Windows.Controls;assembly= System.Windows.Controls" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <c:HeaderedItemsControl x:Name="headeredItems"> <c:HeaderedItemsControl.Header> <TextBlock FontSize="22" Text="Colors" TextDecorations="Underline"/> </c:HeaderedItemsControl.Header>
SILVERLIGHT USER INTERFACE CONTROLS
<c:HeaderedItemsControl.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding}"/> </DataTemplate> </c:HeaderedItemsControl.ItemTemplate> </c:HeaderedItemsControl> </Grid> </UserControl> The data binding simply points the ItemsSource property in the direction of a string array: string[] colors = { "Red", "Green", "Blue", "Cyan" }; headeredItems.ItemsSource = colors;
ContentControl
Many controls can define their content by using other controls. This provides an amazing degree of flexibility over how you construct user interfaces. One place where this is useful is in the ListBox control, where the items of the list box can be anything you can construct in XAML using controls. The controls that support this capability inherit from System.Windows.Controls.ContentControl. You can tell immediately that a specific control inherits from the ContentControl class by noticing it has a Content property in the IntelliSense window. Table 3-31 describes the properties of ContentControl. Table 3-31. Properties of the System.Windows.Controls.ContentControl Class
Property
Content
Type
Object
Description
Defines the value of the ContentControl dependency property. Gets/sets the data template for this content control, used for data binding.
ContentTemplate DataTemplate
The controls that inherit from ContentControl are ChildWindow, Frame, Label, ListBoxItem, Primitives.ButtonBase, ScrollViewer, DataGridCell, Primitives.DataGridColumnHeader, Primitives.DataGridRowHeader, TabItem, and ToolTip.
HeaderedContentControl
Derived from the ContentControl and part of the Silverlight Toolkit, the HeaderedContentControl provides an easy way to display a header above arbitrary content. The following XAML creates the same list of colors as the HeaderedItemsControl example, using a StackPanel to display the colors vertically: <UserControl x:Class="chapter3.HeaderedContentControlDemo" 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"
SILVERLIGHT USER INTERFACE CONTROLS
xmlns:c="clr-namespace:System.Windows.Controls;assembly= System.Windows.Controls.Toolkit" mc:Ignorable="d" d:DesignHeight="600" d:DesignWidth="500"> <Grid x:Name="LayoutRoot" Background="White"> <c:HeaderedContentControl> <c:HeaderedContentControl.Header> <TextBlock FontSize="22" Text="Colors" TextDecorations="Underline"/> </c:HeaderedContentControl.Header> <c:HeaderedContentControl.Content> <StackPanel Orientation="Vertical"> <TextBlock Text="Red"/> <TextBlock Text="Green"/> <TextBlock Text="Blue"/> <TextBlock Text="Cyan"/> </StackPanel> </c:HeaderedContentControl.Content> </c:HeaderedContentControl> </Grid> </UserControl> Table 3-32 defines the properties of the HeaderedContentControl class: Table 3-32. Properties of the System.Windows.Controls.HeaderedContentControl Class
Property
Header HeaderTemplate
Type
object DataTemplate
Description
Specifies what is used as content for the header. Defines the template used to display the content of the control s header. See 6 for details.
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