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WPF FAQ - GridSplitter

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The following example shows how to create and use an ‘instance’ of the GridLengthConverter object. The example defines a custom method called ‘changeCol()’, which passes the ListBoxItem to a GridLengthConverter that converts the Content of a ListBoxItem to an instance of GridLength. The converted value is then passed back as the value of the ‘Width’ property of the ColumnDefinition element.

[C#]
 
public void changeColVal(object sender, RoutedEventArgs e) 
        {
            txt1.Text = 'Current Grid Column is ' + hs1.Value.ToString();
        }

        public void changeCol(object sender, SelectionChangedEventArgs args)
        {
            ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
            GridLengthConverter myGridLengthConverter = new GridLengthConverter();
            if (hs1.Value == 0)
            {
                GridLength gl1 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col1.Width = gl1;
            }
            else if (hs1.Value == 1)
            {
                GridLength gl2 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col2.Width = gl2;
            }
            else if (hs1.Value == 2)
            {
                GridLength gl3 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col3.Width = gl3;
            }
        }

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To prevent hidden GridSplitter controls, do one of the following :

  • Make sure that the GridSplitter controls are the last Children added to the Grid. The following example shows the GridSplitter as the last element in the Children collection of the Grid.
  • [XAML]
    
    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <Button Grid.Column='0'/>
      <GridSplitter Grid.Column ='0' Background='Blue'/>
    </Grid>
    
  • Set the ‘Zindex’ Property on the GridSplitter to be higher than a control that would otherwise hide it. The following example gives the GridSplitter control a higher ’Zindex’ Property than the Button control.
  • [XAML]
    
    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <GridSplitter Grid.Column='0' Background='Blue'
                    Panel.ZIndex='1'/>
      <Button Grid.Column='0'/>
    </Grid>
    
    
  • Set margins on the control that would otherwise hide the GridSplitter so that the GridSplitter is exposed. The following example sets margins on a control that would otherwise overlay and hide the GridSplitter.
  • [XAML]
    
    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <GridSplitter Grid.Column ='0' Background='Blue'/>
      <Button Grid.Column='0' Margin='0,0,5,0'/>
    </Grid>
    
    
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