Define a GridSplitter and Resize Direction Changed

  
<Window x:Class="GridSplitter_Example.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="GridSplitter Example">
<Grid>
  <Grid.ColumnDefinitions>
    <ColumnDefinition Name="Col0" />
    <ColumnDefinition Name="Col1" />
    <ColumnDefinition Name="Col2" />
    <ColumnDefinition Name="Col3" />
  </Grid.ColumnDefinitions>
  <Grid.RowDefinitions>
    <RowDefinition Name="Row0" />
    <RowDefinition Name="Row1" />
    <RowDefinition Name="Row2" />
  </Grid.RowDefinitions>

  <StackPanel Grid.Row="0" Grid.Column="0" Background="Orange">
    <TextBlock>Row 0 Col 0</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="1" Grid.Column="0" Background="Blue">
    <TextBlock>Row 1 Col 0</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="2" Grid.Column="0" Background="Green">
    <TextBlock>Row 2 Col 1</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="0" Grid.Column="1" Background="Purple">
    <TextBlock>Row 0 Col 1</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="1" Grid.Column="1" Background="Red">
    <TextBlock>Row 1 Col 1</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="2" Grid.Column="1" Background="Salmon">
   <TextBlock>Row 2 Col 1</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="0" Grid.Column="2" Background="MediumVioletRed">
    <TextBlock>Row 0 Col 2</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="1" Grid.Column="2" Background="SteelBlue">
    <TextBlock>Row 1 Col 2</TextBlock>
  </StackPanel>
  <StackPanel Grid.Row="2" Grid.Column="2" Background="Olive">
    <TextBlock>Row 2 Col 2</TextBlock>
  </StackPanel>
   
  <GridSplitter Name="myGridSplitter" Grid.Column="1" Grid.Row="1" Width="5"/>
  <StackPanel Grid.Column="3" Grid.RowSpan="3" Background="Brown">
    <TextBlock FontSize="14" Foreground="Yellow">Property Settings</TextBlock>
      <StackPanel Margin="0,5,0,0">
        <TextBlock>ResizeDirection</TextBlock>
        <RadioButton Name="ResizeDirectionAuto" Checked="ResizeDirectionChanged" IsChecked="true" GroupName="ResizeDirectionProperty">
        Auto (default)
        </RadioButton>
        <RadioButton Name="ResizeDirectionCols" Checked="ResizeDirectionChanged" GroupName="ResizeDirectionProperty">
        Columns
        </RadioButton>
        <RadioButton Name="ResizeDirectionRows" Checked="ResizeDirectionChanged" GroupName="ResizeDirectionProperty">
        Rows
        </RadioButton>
      </StackPanel>
  </StackPanel>
</Grid>
</Window>
//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace GridSplitter_Example
{
  public partial class Window1 : Window
  {
      public Window1()
      {
        InitializeComponent();
      }

        private void ResizeDirectionChanged(object sender, RoutedEventArgs e)
        {
          if ((Boolean)ResizeDirectionAuto.IsChecked)
            myGridSplitter.ResizeDirection = GridResizeDirection.Auto;
          else if ((Boolean)ResizeDirectionCols.IsChecked)
            myGridSplitter.ResizeDirection = GridResizeDirection.Columns;
          else if ((Boolean)ResizeDirectionRows.IsChecked)
            myGridSplitter.ResizeDirection = GridResizeDirection.Rows;
        }
  
  }
}

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Define a GridSplitter and Resize Direction Changed : GridSplitter « Windows Presentation Foundation « C# / C Sharp

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