Emmanuele Sassi
91 lines
3.7 KiB
VB.net
91 lines
3.7 KiB
VB.net
' Follow steps 1a or 1b and then 2 to use this custom control in a XAML file.
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'
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' Step 1a) Using this custom control in a XAML file that exists in the current project.
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' Add this XmlNamespace attribute to the root element of the markup file where it is
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' to be used:
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'
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' xmlns:MyNamespace="clr-namespace:EgtWPFLib5"
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'
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'
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' Step 1b) Using this custom control in a XAML file that exists in a different project.
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' Add this XmlNamespace attribute to the root element of the markup file where it is
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' to be used:
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'
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' xmlns:MyNamespace="clr-namespace:EgtWPFLib5;assembly=EgtWPFLib5"
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'
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' You will also need to add a project reference from the project where the XAML file lives
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' to this project and Rebuild to avoid compilation errors:
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'
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' Right click on the target project in the Solution Explorer and
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' "Add Reference"->"Projects"->[Browse to and select this project]
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'
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'
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' Step 2)
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' Go ahead and use your control in the XAML file. Note that Intellisense in the
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' XML editor does not currently work on custom controls and its child elements.
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'
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' <MyNamespace:EgtTextBox/>
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'
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Imports System.Windows.Controls.Primitives
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Imports System.ComponentModel
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Public Class EgtTextBox
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Inherits System.Windows.Controls.TextBox
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' Proprietà che permette di impostare l'altezza della TitleBar
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Public Shared ReadOnly ExplicitUpdateSourceProperty As DependencyProperty = DependencyProperty.Register("ExplicitUpdateSource", GetType(UpdateSourceType), GetType(EgtTextBox), New PropertyMetadata(UpdateSourceType.Null))
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Public Property ExplicitUpdateSource() As UpdateSourceType
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Get
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Return GetValue(ExplicitUpdateSourceProperty)
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End Get
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Set(ByVal value As UpdateSourceType)
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SetValue(ExplicitUpdateSourceProperty, value)
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End Set
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End Property
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Public Enum UpdateSourceType As Integer
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Null = 0
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PropertyChanged = 1
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EnterKeyPress = 2
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End Enum
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Shared Sub New()
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'This OverrideMetadata call tells the system that this element wants to provide a style that is different than its base class.
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'This style is defined in themes\generic.xaml
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DefaultStyleKeyProperty.OverrideMetadata(GetType(EgtTextBox), New FrameworkPropertyMetadata(GetType(EgtTextBox)))
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End Sub
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Private Sub EgtTextBox_PreviewKeyDown(sender As Object, e As System.Windows.Input.KeyEventArgs) Handles Me.PreviewKeyDown
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If e.Key = Key.Enter Then
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If ExplicitUpdateSource = UpdateSourceType.EnterKeyPress Then
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Me.GetBindingExpression(TextBox.TextProperty).UpdateSource()
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End If
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Keyboard.ClearFocus()
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End If
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End Sub
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Private Sub EgtTextBox_TextChanged(sender As Object, e As System.Windows.Controls.TextChangedEventArgs) Handles Me.TextChanged
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If ExplicitUpdateSource = UpdateSourceType.PropertyChanged Then
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Me.GetBindingExpression(TextBox.TextProperty).UpdateSource()
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End If
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End Sub
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Private Sub ExplicitBindingTextBox_Loaded(sender As Object, e As RoutedEventArgs)
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Dim textBox As TextBox = TryCast(sender, TextBox)
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If TryCast(textBox.DataContext, INotifyPropertyChanged) Is Nothing Then
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Throw New InvalidOperationException("...")
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End If
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AddHandler TryCast(textBox.DataContext, INotifyPropertyChanged).PropertyChanged, AddressOf ViewModel_PropertyChanged
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End Sub
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Private Sub ViewModel_PropertyChanged(sender As Object, e As System.ComponentModel.PropertyChangedEventArgs)
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If ExplicitUpdateSource = UpdateSourceType.PropertyChanged Or ExplicitUpdateSource = UpdateSourceType.EnterKeyPress Then
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Me.GetBindingExpression(TextBox.TextProperty).UpdateTarget()
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End If
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End Sub
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End Class
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