How to resize a certain control based on Window size in WPF?

Question

I have a ListView control where I want to resize the last column in sync with the size of the Window. So if the Window's width increases by 100 units, I want the columns' width to also increase by 100.

Should I be using the Resize event on the Window and use a magic number to resize the column header manually, sort of like?:

columnHeader.Width = windowSize.X - 400;

Answer 1

I can't take full credit for this answer, because I got it here

But basically this is the idea:

Replace the "View" in the listView with a GridView. Then, you can specify whatever width you want for the first columns. In this case 100, 50, 50. Then we add a binding on the final column, that takes as input the parent ListView control. But we are allowing a converter to do the dirty work for us.

<ListView>
    <ListView.View>
      <GridView>
        <GridViewColumn Header="Title" DisplayMemberBinding="{Binding}" Width="100"/>
        <GridViewColumn Header="Title" DisplayMemberBinding="{Binding}" Width="50"/>
        <GridViewColumn Header="Title" DisplayMemberBinding="{Binding}" Width="50"/>
        <GridViewColumn Header="4" DisplayMemberBinding="{Binding}">
        <GridViewColumn.Width>
          <MultiBinding Converter="{StaticResource starWidthConverter}">
            <Binding Path="ActualWidth"  RelativeSource="{RelativeSource AncestorType=ListView}"/>
            <Binding RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=ListView}"/>
          </MultiBinding>
        </GridViewColumn.Width>
      </GridViewColumn>
     </GridView>
    </ListView.View>
    <ListViewItem>item1</ListViewItem>
    <ListViewItem>item2</ListViewItem>
    <ListViewItem>item3</ListViewItem>
    <ListViewItem>item4</ListViewItem>
  </ListView>

So, in the converter 'Convert' function we do this:

ListView listview = value[1] as ListView;
double width = listview.ActualWidth;
GridView gv = listview.View as GridView;
for(int i = 0;i < gv.Columns.Count-1;i++)
{
  if(!Double.IsNaN(gv.Columns[i].Width))
    width -= gv.Columns[i].Width;
}
return width - 5;// this is to take care of margin/padding

Which grabs the listview width, and calculates the new size.