public ListViewColumnHeaderCommandBehavior()
{
onColumnHeaderClick = (s, e) =>
{
var clickedHeader = e.OriginalSource as GridViewColumnHeader;
if (clickedHeader != null && clickedHeader.Role != GridViewColumnHeaderRole.Padding)
{
var column = clickedHeader.Column;
String commandParam = null;
if (column.DisplayMemberBinding is Binding)
{
commandParam = (( Binding )column.DisplayMemberBinding).Path.Path;
}
else
{
commandParam = GridViewColumnManager.GetSortProperty(column);
}
if (!String.IsNullOrEmpty(commandParam) && this.Command != null && this.Command.CanExecute(commandParam))
{
this.Command.Execute(commandParam);
}
}
};
onLoaded = (s, e) =>
{
this.AssociatedObject.AddHandler(
GridViewColumnHeader.ClickEvent,
onColumnHeaderClick);
};
}
static void AdjustColumns(ListView listView)
{
if (ListViewManager.GetAutoSizeColumns(listView))
{
var gv = Ensure.That(listView.View as GridView)
.WithMessage("This behavior can be attached only to ListView(s) whose view is a GridView.")
.IsNotNull()
.GetValue();
var columnsToStretch = gv.Columns.Where(c => GridViewColumnManager.GetFill(c));
if (columnsToStretch.Any())
{
var subtract = .0d;
var sv = VisualTreeCrawler.FindChild <ScrollViewer>(listView);
if (sv != null && sv.ComputedVerticalScrollBarVisibility == Visibility.Visible)
{
var sb = VisualTreeCrawler.FindChild <ScrollBar>(sv, child => child.Orientation == Orientation.Vertical);
if (sb != null)
{
subtract = sb.Width;
}
}
var nonStretchedColumnsActualWidth = gv.Columns
.Where(c => !GridViewColumnManager.GetFill(c))
.Aggregate(0d, (w, c) =>
{
w += c.ActualWidth;
return(w);
});
var availableWidth = listView.ActualWidth - subtract - nonStretchedColumnsActualWidth;
if (availableWidth <= 0)
{
logger.Warning
(
"Columns cannot be auto sized, available size is invalid: {0}",
availableWidth
);
}
if (availableWidth > 0)
{
var columnsAvarageWidth = availableWidth / columnsToStretch.Count();
foreach (var column in columnsToStretch)
{
column.Width = columnsAvarageWidth;
}
}
}
}
}
