protected virtual void OnColumnActualWidthChanged(ColumnActualWidthChangedEventArgs e)
{
// We pass the delta between the old and new value to tell the Panel to reduce the horizontal offset when a column is auto-resized to a smaller value
if (e != null)
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnActualWidthChanged, e.OldValue - e.NewValue));
}
else
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnActualWidthChanged));
}
}
protected override bool OnReceivedWeakEvent(Type managerType, object sender, EventArgs e)
{
bool handled = false;
bool detachFromDataGridContext = false;
if (managerType == typeof(VisibleColumnsUpdatedEventManager))
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnReordering));
handled = true;
}
else if (managerType == typeof(CollectionChangedEventManager))
{
if (sender == this.DataGridContext.Items.SortDescriptions)
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.SortingChanged));
}
if (sender == this.DataGridContext.Items.GroupDescriptions)
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.GroupingChanged));
}
handled = true;
}
else if (managerType == typeof(ColumnActualWidthEventManager))
{
ColumnActualWidthChangedEventArgs args = e as ColumnActualWidthChangedEventArgs;
// We pass the delta between the old and new value to tell the Panel to reduce the
// horizontal offset when a column is auto-resized to a smaller value
if (args != null)
{
double delta = args.OldValue - args.NewValue;
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnActualWidthChanged, delta));
}
else
{
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnActualWidthChanged));
}
handled = true;
}
else if (managerType == typeof(ViewChangedEventManager))
{
detachFromDataGridContext = true;
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.Unspecified));
handled = true;
}
else if (managerType == typeof(ThemeChangedEventManager))
{
detachFromDataGridContext = true;
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.Unspecified));
handled = true;
}
else if (managerType == typeof(DataGridControlTemplateChangedEventManager))
{
this.UpdateScrollViewer();
this.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.Unspecified));
handled = true;
}
else if (managerType == typeof(ItemsSourceChangeCompletedEventManager))
{
detachFromDataGridContext = true;
handled = true;
}
if (detachFromDataGridContext == true)
{
if (this.DataGridContext != null)
{
// Detach the ColumnVirtualizationManager from the DataGridContext and detach from the DataGridContext
ColumnVirtualizationManager.SetColumnVirtualizationManager(this.DataGridContext, null);
this.Uninitialize();
}
}
return(handled);
}
