internal static void ProvideContextForObject(DependencyObject context, TreeGridColumn newValue)
{
if (context != null)
{
MSInternal.ProvideSelfAsInheritanceContext(context, newValue, null);
}
}
/// <summary>
/// 为指定列生成 header 并添加到 InternalChildren 的索引 index 处。
/// </summary>
/// <param name="column"></param>
/// <param name="index"></param>
/// <returns></returns>
private TreeGridColumnHeader CreateAndInsertHeader(TreeGridColumn column, int index)
{
object header = column.Header;
var gridViewColumnHeader = header as TreeGridColumnHeader;
if (header != null)
{
var dependencyObject = header as DependencyObject;
if (dependencyObject != null)
{
var visual = dependencyObject as Visual;
if (visual != null)
{
var visual2 = VisualTreeHelper.GetParent(visual) as Visual;
if (visual2 != null)
{
if (gridViewColumnHeader != null)
{
var gridViewHeaderRowPresenter = visual2 as TreeGridHeaderRowPresenter;
if (gridViewHeaderRowPresenter != null)
{
MSInternal.RemoveNoVerify(gridViewHeaderRowPresenter.UIChildren, gridViewColumnHeader);
}
}
else
{
var gridViewColumnHeader2 = visual2 as TreeGridColumnHeader;
if (gridViewColumnHeader2 != null)
{
gridViewColumnHeader2.ClearValue(ContentControl.ContentProperty);
}
}
}
}
var parent = LogicalTreeHelper.GetParent(dependencyObject);
if (parent != null)
{
MSInternal.RemoveLogicalChild(parent, header);
}
}
}
if (gridViewColumnHeader == null)
{
gridViewColumnHeader = new TreeGridColumnHeader();
gridViewColumnHeader.IsInternalGenerated = true;
}
gridViewColumnHeader.SetValue(TreeGridColumnHeader.ColumnPropertyKey, column);
this.HookupItemsControlKeyboardEvent(gridViewColumnHeader);
base.UIChildren.Insert(index, gridViewColumnHeader);
this.UpdateHeader(gridViewColumnHeader);
this._gvHeadersValid = false;
return(gridViewColumnHeader);
}
internal static void RemoveContextFromObject(DependencyObject context, TreeGridColumn oldValue)
{
if (context != null && MSInternal.GetInheritanceContext(oldValue) == context)
{
MSInternal.ProvideSelfAsInheritanceContext(context, oldValue, null);
}
}
private void FindViewPort(TreeGridRow row)
{
var itemsControl = row.ParentItemsControl;
if (itemsControl != null)
{
var scrollViewer = MSInternal.GetScrollHost(itemsControl);
if (scrollViewer != null && scrollViewer.CanContentScroll)
{
var itemsHost = MSInternal.GetItemsHost(itemsControl);
if (itemsHost is VirtualizingPanel)
{
this._viewPort = scrollViewer.Template.FindName(PART_ScrollContentPresenter, scrollViewer) as FrameworkElement;
if (this._viewPort == null)
{
this._viewPort = scrollViewer;
}
}
}
}
}
