private static void Control_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
var scrollViewer = sender as ScrollViewer;
// 设置自动滚动的最低的差异值
double diffValue = _DiffValue_Default_Value_;
try
{
// 对应 ListBox / ListView / DataGrid 等 Selector
var matchParent = WPFControlsUtils.FindParentOfType <System.Windows.Controls.Primitives.Selector>(scrollViewer);
if (matchParent != null)
{
diffValue = GetDiffValue(matchParent);
goto CalcLogic;
}
// 对应方法2 (ItemsControl)
var matchItemsControl = WPFControlsUtils.FindParentOfType <System.Windows.Controls.ItemsControl>(scrollViewer);
if (matchItemsControl != null)
{
diffValue = GetDiffValue(matchItemsControl);
goto CalcLogic;
}
// 对应方法1 (ItemsControl)
diffValue = GetDiffValue(scrollViewer);
goto CalcLogic;
}
catch (Exception)
{
diffValue = _DiffValue_Default_Value_;
goto CalcLogic;
}
CalcLogic:
// 如果接近底部, 执行滚动逻辑
if (scrollViewer.ScrollableHeight - scrollViewer.VerticalOffset < diffValue)
{
scrollViewer.ScrollToEnd();
}
#if DEBUG
string msg = $"实际:{scrollViewer.ScrollableHeight - scrollViewer.VerticalOffset}, 设置:{diffValue}";
System.Diagnostics.Debug.WriteLine(msg);
#endif
}
static void UpdateColumnStyles(System.Windows.Controls.DataGrid dataGrid)
{
var parent = WPFControlsUtils.FindParentOfType <UserControl>(dataGrid);
var originStyle = GetColumnStyle(parent);
// foreach (var column in dataGrid.Columns.OfType<System.Windows.Controls.DataGridTextColumn>()) // TODO 优化参数 DataGridTextColumn
foreach (var column in dataGrid.Columns.OfType <System.Windows.Controls.DataGridBoundColumn>()) // 待测试 DataGridBoundColumn
{
var newStyle = new Style();
newStyle.BasedOn = column.ElementStyle;
newStyle.TargetType = originStyle.TargetType;
foreach (var setter in originStyle.Setters.OfType <Setter>())
{
newStyle.Setters.Add(setter);
}
column.ElementStyle = newStyle;
}
}
void Test1(object obj)
{
Button o = obj as Button;
var r = WPFControlsUtils.FindParentOfType <Grid>(o);
}
static void Handle_ItemsSource_Changed_ForItemsControl(object sender, EventArgs e)
{
var ss = WPFControlsUtils.FindParentOfType <System.Windows.Controls.ScrollContentPresenter>(sender as ItemsControl);
ss.ScrollOwner.ScrollToEnd();
}
void Test2(object obj)
{
Button o = obj as Button;
// 指定找上上级的 Grid
var r = WPFControlsUtils.FindParentOfType <Grid>(o, parentName: "g0");
}