Convert the contents of a ListBoxItem to an instance of GridLength by using GridLengthConverter : ListBox « Windows Presentation Foundation « VB.Net Tutorial






  1. VB.Net Tutorial
  2. Windows Presentation Foundation
  3. ListBox
<Window  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="GridLengthConverter_grid.Window1"
    Title="GridLengthConverter Sample"
    WindowState="Maximized">
  <StackPanel>
      <Grid Name="grid1" ShowGridLines="True" Height="300">
          <Grid.ColumnDefinitions>
            <ColumnDefinition Name="col1" />
            <ColumnDefinition Name="col2" />
            <ColumnDefinition Name="col3" />
          </Grid.ColumnDefinitions>
          <Grid.RowDefinitions>
            <RowDefinition Name="row1" />
            <RowDefinition Name="row2" />
            <RowDefinition Name="row3" />
          </Grid.RowDefinitions>
          <TextBlock Grid.Row="0" Grid.Column="0" TextWrapping="Wrap">Column 0, Row 0</TextBlock>
          <TextBlock Grid.Row="0" Grid.Column="1" TextWrapping="Wrap">Column 1, Row 0</TextBlock>
          <TextBlock Grid.Row="0" Grid.Column="2" TextWrapping="Wrap">Column 2, Row 0</TextBlock>
          <TextBlock Grid.Row="1" Grid.Column="0" TextWrapping="Wrap">Column 0, Row 1</TextBlock>
          <TextBlock Grid.Row="1" Grid.Column="1" TextWrapping="Wrap">Column 1, Row 1</TextBlock>
          <TextBlock Grid.Row="1" Grid.Column="2" TextWrapping="Wrap">Column 2, Row 1</TextBlock>
          <TextBlock Grid.Row="2" Grid.Column="0" TextWrapping="Wrap">Column 0, Row 2</TextBlock>
          <TextBlock Grid.Row="2" Grid.Column="1" TextWrapping="Wrap">Column 1, Row 2</TextBlock>
          <TextBlock Grid.Row="2" Grid.Column="2" TextWrapping="Wrap">Column 2, Row 2</TextBlock>
     </Grid>
       <Slider Name="hs1" Width="100" IsSnapToTickEnabled="True" Maximum="2" TickPlacement="BottomRight" TickFrequency="1" ValueChanged="changeColVal"/>
       <Slider Orientation="Horizontal" Name="hs2" Width="100" IsSnapToTickEnabled="True" Maximum="2" TickPlacement="BottomRight" TickFrequency="1" ValueChanged="changeRowVal" />
       <TextBlock Name="txt1" TextWrapping="Wrap"/>
       <TextBlock Name="txt2" TextWrapping="Wrap"/>
       <ListBox Width="50" Height="50" SelectionChanged="changeCol">
           <ListBoxItem>25</ListBoxItem>
           <ListBoxItem>50</ListBoxItem>
           <ListBoxItem>75</ListBoxItem>
           <ListBoxItem>100</ListBoxItem>
           <ListBoxItem>125</ListBoxItem>
           <ListBoxItem>150</ListBoxItem>        
      </ListBox>

        <ListBox Width="50" Height="50" SelectionChanged="changeRow">
          <ListBoxItem>25</ListBoxItem>
          <ListBoxItem>50</ListBoxItem>
          <ListBoxItem>75</ListBoxItem>
          <ListBoxItem>100</ListBoxItem>
          <ListBoxItem>125</ListBoxItem>
          <ListBoxItem>150</ListBoxItem>
        </ListBox>      
        <Button Name="btn1" Click="setMinWidth">Set MinWidth="100"</Button>
        <Button Name="btn2" Click="setMaxWidth">Set MaxWidth="125"</Button>
        <Button Name="btn3" Click="setMinHeight">Set MinHeight="50"</Button>
        <Button Name="btn4" Click="setMaxHeight">Set MaxHeight="75"</Button> 
    </StackPanel>
</Window>
//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents

Namespace GridLengthConverter_grid
  Public Partial Class Window1
    Inherits Window

    Public Sub changeRowVal(sender As Object, e As RoutedEventArgs)
      txt2.Text = "Current Grid Row is " + hs2.Value.ToString()
    End Sub

    Public Sub changeColVal(sender As Object, e As RoutedEventArgs)
      txt1.Text = "Current Grid Column is " + hs1.Value.ToString()
    End Sub

    Public Sub changeCol(sender As Object, args As SelectionChangedEventArgs)
      Dim li As ListBoxItem = TryCast(TryCast(sender, ListBox).SelectedItem, ListBoxItem)
      Dim myGridLengthConverter As New GridLengthConverter()
      If hs1.Value = 0 Then
        Dim gl1 As GridLength = CType(myGridLengthConverter.ConvertFromString(li.Content.ToString()), GridLength)
        col1.Width = gl1
      ElseIf hs1.Value = 1 Then
        Dim gl2 As GridLength = CType(myGridLengthConverter.ConvertFromString(li.Content.ToString()), GridLength)
        col2.Width = gl2
      ElseIf hs1.Value = 2 Then
        Dim gl3 As GridLength = CType(myGridLengthConverter.ConvertFromString(li.Content.ToString()), GridLength)
        col3.Width = gl3
      End If
    End Sub
    Public Sub changeRow(sender As Object, args As SelectionChangedEventArgs)
      Dim li2 As ListBoxItem = TryCast(TryCast(sender, ListBox).SelectedItem, ListBoxItem)
      Dim myGridLengthConverter2 As New GridLengthConverter()

      If hs2.Value = 0 Then
        Dim gl4 As GridLength = CType(myGridLengthConverter2.ConvertFromString(li2.Content.ToString()), GridLength)
        row1.Height = gl4
      ElseIf hs2.Value = 1 Then
        Dim gl5 As GridLength = CType(myGridLengthConverter2.ConvertFromString(li2.Content.ToString()), GridLength)
        row2.Height = gl5
      ElseIf hs2.Value = 2 Then
        Dim gl6 As GridLength = CType(myGridLengthConverter2.ConvertFromString(li2.Content.ToString()), GridLength)
        row3.Height = gl6
      End If

    End Sub

    Public Sub setMinWidth(sender As Object, e As RoutedEventArgs)
      col1.MinWidth = 100
      col2.MinWidth = 100
      col3.MinWidth = 100
    End Sub
    Public Sub setMaxWidth(sender As Object, e As RoutedEventArgs)
      col1.MaxWidth = 125
      col2.MaxWidth = 125
      col3.MaxWidth = 125
    End Sub
    Public Sub setMinHeight(sender As Object, e As RoutedEventArgs)
      row1.MinHeight = 50
      row2.MinHeight = 50
      row3.MinHeight = 50
    End Sub
    Public Sub setMaxHeight(sender As Object, e As RoutedEventArgs)
      row1.MaxHeight = 75
      row2.MaxHeight = 75
      row3.MaxHeight = 75
    End Sub

  End Class
End Namespace
WPF Convert The Contents Of A List Box Item To An Instance Of Grid Length By Using Grid Length Converter




16.27.ListBox
16.27.1.Bind String Array Resource to ListBoxBind String Array Resource to ListBox
16.27.2.Use Data Templates to Display Bound DataUse Data Templates to Display Bound Data
16.27.3.CheckBox ListCheckBox List
16.27.4.Convert the contents of a ListBoxItem to an instance of GridLength by using GridLengthConverterConvert the contents of a ListBoxItem to an instance of GridLength by using GridLengthConverter
16.27.5.Use the FontSizeConverter class to convert the content of a ListBoxItem to a value that represents the size of a font.Use the FontSizeConverter class to convert the content of a ListBoxItem to a value that represents the size of a font.
16.27.6.Convert contents of a ListBoxItem to an instance of Thickness by using the ThicknessConverterConvert contents of a ListBoxItem to an instance of Thickness by using the ThicknessConverter
16.27.7.DataTrigger, ListBox and user objectDataTrigger, ListBox and user object
16.27.8.Add selected file to ListBoxAdd selected file to ListBox
16.27.9.This list box allows items to be selected in groups by using the SHIFT key and mouse or the CTRL key and space key.This list box allows items to be selected in groups by using the SHIFT key and mouse or the CTRL key and space key.
16.27.10.Iterate through the selected items and remove each oneIterate through the selected items and remove each one
16.27.11.Ensure there is at least one item selectedEnsure there is at least one item selected