static void Sub(object sender)
{
// 又由于要兼容 ItemsControl, 所以将 obj 转换为 System.Windows.Controls.Control
// var source = s0 as System.Windows.Controls.Primitives.Selector;
// var source = s0 as System.Windows.Controls.Control;
// 虽然 ListBox / ListView / DataGrid 基类都是 Selector, 并且其结构都是 Selector => Decorator => ScrollViewer
// Decorator border = System.Windows.Media.VisualTreeHelper.GetChild(source, 0) as Decorator;
// ScrollViewer target = border.Child as ScrollViewer;
// 但为了更加灵活, 不再规限内部的层级结构, 使用 WPFControlsUtils.FindChildOfType<T>
ScrollViewer target = WPFControlsUtils.FindChildOfType <ScrollViewer>(sender as System.Windows.Controls.Control);
if (target == null)
{
System.Diagnostics.Debug.WriteLine("找不到ScrollViewer");
System.Diagnostics.Debugger.Break();
return;
}
target.ScrollToEnd();
var dpDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, sender.GetType());
// 为 ItemsSource 添加监控更改事件
dpDescriptor.AddValueChanged(sender, Handle_ItemsSource_Changed);
}
static void Handle_ItemsSource_Changed(object s, EventArgs e)
{
// var source = s as System.Windows.Controls.Primitives.Selector;
var scrollViewer = WPFControlsUtils.FindChildOfType <ScrollViewer>(s as System.Windows.Controls.Control);
scrollViewer?.ScrollToEnd();
}
void Test4(object obj)
{
var buttons = WPFControlsUtils.FindChilrenOfType <System.Windows.Controls.Button>(obj as Grid);
if (buttons.Count == 4)
{
WPFControls.MessageBox.ShowInformation("成功");
}
}
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
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
// this.PART_TextBox = VisualHelper.FindVisualElement<DatePickerTextBox>(this, "PART_TextBox_New");
this.PART_TextBox = WPFControlsUtils.FindChildOfType <DatePickerTextBox>(this, "PART_TextBox_New");
// this.PART_Popup = VisualHelper.FindVisualElement<Popup>(this, "PART_Popup_New");
this.PART_Popup = WPFControlsUtils.FindChildOfType <Popup>(this, "PART_Popup_New");
this.PART_Calendar = GetTemplateChild("PART_Calendar") as Calendar;
this.PART_TimePicker = GetTemplateChild("PART_TimePicker") as TimePicker;
this.PART_Clear_Button = GetTemplateChild("PART_Clear_Button") as Button;
this.PART_Today_Button = GetTemplateChild("PART_Today_Button") as Button;
this.PART_Confirm_Button = GetTemplateChild("PART_Confirm_Button") as Button;
if (this.PART_Calendar != null)
{
this.PART_Calendar.AddHandler(Button.MouseLeftButtonDownEvent, new RoutedEventHandler(DayButton_MouseLeftButtonUp), true);
}
if (this.PART_TimePicker != null)
{
this.PART_TimePicker.SelectedTimeChanged += PART_TimePicker_SelectedTimeChanged;;
}
if (this.PART_Popup != null)
{
this.PART_Popup.Opened += PART_Popup_Opened;
this.PART_Popup.Closed += PART_Popup_Closed;
}
if (this.PART_Today_Button != null)
{
this.PART_Today_Button.Click += PART_Today_Button_Click;
}
if (this.PART_Confirm_Button != null)
{
this.PART_Confirm_Button.Click += PART_Confirm_Button_Click;
}
if (this.PART_Clear_Button != null)
{
this.PART_Clear_Button.Click += PART_Clear_Button_Click;
}
}
public static DataGridCell GetGridCell(this DataGrid dataGrid, int rowIndex, int colIndex)
{
DataGridRow rowContainer = GetGridRow(dataGrid, rowIndex);
if (rowContainer != null)
{
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[colIndex]);
var presenter = WPFControlsUtils.FindChildOfType <System.Windows.Controls.Primitives.DataGridCellsPresenter>(rowContainer);
if (presenter != null)
{
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[colIndex]);
return((DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(colIndex));
}
}
return(null);
}
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;
}
}
private static void Grid_Loaded(object sender, RoutedEventArgs e)
{
var query = WPFControlsUtils.FindChilrenOfType <System.Windows.Controls.DataGrid>(sender as UserControl);
if (query == null || query.Count == 0)
{
return;
}
foreach (System.Windows.Controls.DataGrid dataGrid in query)
{
if (dataGrid == null)
{
return;
}
//dataGrid.Columns.CollectionChanged += (s0, e0) =>
//{
UpdateColumnStyles(dataGrid);
//};
}
}
static void Sub(object s0)
{
// 又由于要兼容 ItemsControl, 所以将 obj 转换为 System.Windows.Controls.Control
// var source = s0 as System.Windows.Controls.Primitives.Selector;
var source = s0 as System.Windows.Controls.Control;
// 虽然 ListBox / ListView / DataGrid 基类都是 Selector, 并且其结构都是 Selector => Decorator => ScrollViewer
// Decorator border = System.Windows.Media.VisualTreeHelper.GetChild(source, 0) as Decorator;
// ScrollViewer target = border.Child as ScrollViewer;
// 但为了更加灵活, 不再规限内部的层级结构, 使用 WPFControlsUtils.FindChildOfType<T>
ScrollViewer target = WPFControlsUtils.FindChildOfType <ScrollViewer>(source);
if (target == null)
{
System.Diagnostics.Debug.WriteLine("找不到ScrollViewer");
System.Diagnostics.Debugger.Break();
return;
}
target.ScrollChanged += Control_ScrollChanged;
target.ScrollToEnd();
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.PART_UP = WPFControlsUtils.FindChildOfType <Button>(this, "PART_UP"); // Edit By Howe
this.PART_DOWN = WPFControlsUtils.FindChildOfType <Button>(this, "PART_DOWN"); // Edit By Howe
if (this.PART_UP != null)
{
this.PART_UP.Click += BtnUp_Click;
}
if (this.PART_DOWN != null)
{
this.PART_DOWN.Click += BtnDown_Click;
}
this.TextChanged += NumericUpDown_TextChanged;
this.KeyUp += NumericUpDown_KeyUp;
this.SetBtnEnabled(this.Value.ToString());
this.MoveCursorToEnd();
this.Value = this.CoreValueCompareMinMax(this.Value);
}
/// <summary>
/// 一旦你开始使用ItemsControl，你可能会遇到一个非常常见的问题：默认情况下，ItemsControl没有任何滚动条，这意味着如果内容不适合，它只是被剪裁。(From wpf-tutorial.com)
/// 所以使用 ItemsControl 加上 ScrollViewer 有两种方法,
/// 方法1. 外面包裹 ScrollViewer
/// 方法2. 使用Template, 在Template设置 <ScrollViewer> <ItemsPresenter /> </ScrollViewer>
/// </summary>
private static void onHandle_IsEnabled_PropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue == null)
{
return;
}
if (sender is ScrollViewer)
{
var scrollViewer = sender as ScrollViewer;
if ((bool)e.NewValue == true)
{
if (e.OldValue != null && (bool)e.OldValue == true)
{
return;
}
if (scrollViewer.Content == null)
{
scrollViewer.Loaded += (s0, e0) =>
{
var target = s0 as ScrollViewer;
var itemsControl = WPFControlsUtils.FindChildOfType <ItemsControl>(target);
if (itemsControl != null) // 对应方法1
{
var dpDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, itemsControl.GetType());
dpDescriptor.AddValueChanged(itemsControl, Handle_ItemsSource_Changed_ForItemsControl);
target.ScrollToEnd();
}
};
return;
}
else
{
var dpDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, scrollViewer.Content.GetType());
dpDescriptor.AddValueChanged(scrollViewer.Content, Handle_ItemsSource_Changed_ForItemsControl);
scrollViewer.ScrollToEnd();
return;
}
}
else
// if ((bool)e.NewValue == false)
{
if (e.OldValue == null || (bool)e.OldValue == false)
{
return;
}
var dpDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, scrollViewer.Content.GetType());
dpDescriptor.RemoveValueChanged(scrollViewer.Content, Handle_ItemsSource_Changed_ForItemsControl);
return;
}
}
// [新版] 合并
// 1. ListBox / ListView / DataGrid 基类都是 Selector
// 2. ItemsControl
if (sender is System.Windows.Controls.Primitives.Selector || sender is ItemsControl)
{
var control = sender as System.Windows.Controls.Control;
ScrollViewer scrollViewer = WPFControlsUtils.FindChildOfType <ScrollViewer>(control);
if ((bool)e.NewValue == true)
{
if (e.OldValue != null && (bool)e.OldValue == true)
{
return;
}
if (scrollViewer == null)
{
// 在 1. ListBox / ListView / DataGrid 中找不到 ScrollViewer
// 或 2. ItemsControl 中找不到 ScrollViewer
// 必须要等待加载完毕后才能找到旗下的 ScrollViewer
control.Loaded += (s0, e0) => { Sub(s0); };
return;
}
else
{
Sub(control);
return;
}
}
else
// if ((bool)e.NewValue == false)
{
if (e.OldValue == null || (bool)e.OldValue == false)
{
return;
}
UnSub(control);
return;
}
}
}
/// 一旦你开始使用ItemsControl，你可能会遇到一个非常常见的问题：默认情况下，ItemsControl没有任何滚动条，这意味着如果内容不适合，它只是被剪裁。(From wpf-tutorial.com)
/// 所以使用 ItemsControl 加上 ScrollViewer 有两种方法,
/// 方法1. 外面包裹 ScrollViewer
/// 方法2. 使用Template, 在Template设置 <ScrollViewer> <ItemsPresenter /> </ScrollViewer>
private static void onHandle_IsEnabled_PropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue == null)
{
return;
}
if (sender is ScrollViewer) // 对应方法1
{
var scrollViewer = sender as ScrollViewer;
if ((bool)e.NewValue == true)
{
if (e.OldValue != null && (bool)e.OldValue == true)
{
return;
}
scrollViewer.ScrollChanged += Control_ScrollChanged;
scrollViewer.ScrollToEnd();
return;
}
else
// if ((bool)e.NewValue == false)
{
if (e.OldValue == null || (bool)e.OldValue == false)
{
return;
}
scrollViewer.ScrollChanged -= Control_ScrollChanged;
return;
}
}
#region [旧版]
//// ListBox / ListView / DataGrid 基类都是 Selector
//if (sender is System.Windows.Controls.Primitives.Selector selector)
//{
// ScrollViewer scrollViewer = WPFControlsUtils.FindChildOfType<ScrollViewer>(selector);
// if ((bool)e.NewValue == true)
// {
// if (e.OldValue != null && (bool)e.OldValue == true) { return; }
// if (scrollViewer == null)
// {
// // 在 ListBox / ListView / DataGrid 中找不到 ScrollViewer
// // 必须要等待加载完毕后才能找到旗下的 ScrollViewer
// selector.Loaded += (s0, e0) => { Sub(s0); };
// return;
// }
// else
// {
// Sub(selector);
// return;
// }
// }
// else
// // if ((bool)e.NewValue == false)
// {
// if (e.OldValue == null || (bool)e.OldValue == false) { return; }
// UnSub(scrollViewer);
// return;
// }
//}
//if (sender is ItemsControl itemsControl) // 对应方法2 // 此处其实可以合并到上面的 if 中 ==> if
//{
// ScrollViewer scrollViewer = WPFControlsUtils.FindChildOfType<ScrollViewer>(itemsControl);
// if ((bool)e.NewValue == true)
// {
// if (e.OldValue != null && (bool)e.OldValue == true) { return; }
// if (scrollViewer == null)
// {
// // 在 ItemsControl 中找不到 ScrollViewer
// // 必须要等待加载完毕后才能找到旗下的 ScrollViewer
// itemsControl.Loaded += (s0, e0) => { Sub(s0); };
// return;
// }
// else
// {
// Sub(itemsControl);
// return;
// }
// }
// else
// // if ((bool)e.NewValue == false)
// {
// if (e.OldValue == null || (bool)e.OldValue == false) { return; }
// UnSub(scrollViewer);
// return;
// }
//}
#endregion
// 新版 将旧版2种情况合并起来
// 1. ListBox / ListView / DataGrid 基类都是 Selector
// 2. ItemsControl
if (sender is System.Windows.Controls.Primitives.Selector || sender is ItemsControl)
{
var control = sender as System.Windows.Controls.Control;
ScrollViewer scrollViewer = WPFControlsUtils.FindChildOfType <ScrollViewer>(control);
if ((bool)e.NewValue == true)
{
if (e.OldValue != null && (bool)e.OldValue == true)
{
return;
}
if (scrollViewer == null)
{
// 在 1. ListBox / ListView / DataGrid 中找不到 ScrollViewer
// 或 2. ItemsControl 中找不到 ScrollViewer
// 必须要等待加载完毕后才能找到旗下的 ScrollViewer
control.Loaded += (s0, e0) => { Sub(s0); };
return;
}
else
{
Sub(control);
return;
}
}
else
// if ((bool)e.NewValue == false)
{
if (e.OldValue == null || (bool)e.OldValue == false)
{
return;
}
UnSub(scrollViewer);
return;
}
}
}
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 Test1(object obj)
{
Button o = obj as Button;
var r = WPFControlsUtils.FindParentOfType <Grid>(o);
}
void Test3(object obj)
{
var scrollViewer = WPFControlsUtils.FindChildOfType <System.Windows.Controls.ScrollViewer>(obj as DataGrid);
}
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");
}
