Fix ESC handling in ticket completion dropdowns
This commit is contained in:
Meik
@@ -1,7 +1,7 @@
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using C4IT.FASD.Base;
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using C4IT.MultiLanguage;
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using FasdDesktopUi.Basics.Helper;
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using FasdDesktopUi.Basics.Models;
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using C4IT.MultiLanguage;
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using FasdDesktopUi.Basics.Helper;
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using FasdDesktopUi.Basics.Models;
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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@@ -125,25 +125,25 @@ namespace FasdDesktopUi.Basics.UserControls
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}
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public static readonly DependencyProperty SearchDataChangedProperty =
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DependencyProperty.Register("SearchDataChanged", typeof(EventHandler<cF4sdHealthSelectionDataRequest>), typeof(ComboBoxPageable), new PropertyMetadata(null));
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#endregion
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#region RestoreParentScrollFocusOnDropDownClose
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public bool RestoreParentScrollFocusOnDropDownClose
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{
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get { return (bool)GetValue(RestoreParentScrollFocusOnDropDownCloseProperty); }
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set { SetValue(RestoreParentScrollFocusOnDropDownCloseProperty, value); }
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}
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public static readonly DependencyProperty RestoreParentScrollFocusOnDropDownCloseProperty =
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DependencyProperty.Register("RestoreParentScrollFocusOnDropDownClose", typeof(bool), typeof(ComboBoxPageable), new PropertyMetadata(false));
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#endregion
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#region ItemData
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public static readonly DependencyProperty SearchDataChangedProperty =
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DependencyProperty.Register("SearchDataChanged", typeof(EventHandler<cF4sdHealthSelectionDataRequest>), typeof(ComboBoxPageable), new PropertyMetadata(null));
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#endregion
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#region RestoreParentScrollFocusOnDropDownClose
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public bool RestoreParentScrollFocusOnDropDownClose
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{
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get { return (bool)GetValue(RestoreParentScrollFocusOnDropDownCloseProperty); }
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set { SetValue(RestoreParentScrollFocusOnDropDownCloseProperty, value); }
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}
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public static readonly DependencyProperty RestoreParentScrollFocusOnDropDownCloseProperty =
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DependencyProperty.Register("RestoreParentScrollFocusOnDropDownClose", typeof(bool), typeof(ComboBoxPageable), new PropertyMetadata(false));
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#endregion
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#region ItemData
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public ObservableCollection<KeyValuePair<string, object>> ItemData
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{
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@@ -222,6 +222,15 @@ namespace FasdDesktopUi.Basics.UserControls
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return null;
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}
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public bool CloseDropDownIfOpen()
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{
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if (ComboBoxControl?.IsDropDownOpen != true)
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return false;
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ComboBoxControl.IsDropDownOpen = false;
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return true;
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}
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#region Paging Events
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#region PageBack
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@@ -316,33 +325,33 @@ namespace FasdDesktopUi.Basics.UserControls
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}
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}
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private void ComboBoxControl_DropDownClosed(object sender, EventArgs e)
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{
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timer.Stop();
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cFocusInvoker.InvokeLostFocus(this, e);
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if (RestoreParentScrollFocusOnDropDownClose)
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{
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_ = Dispatcher.BeginInvoke((Action)(() =>
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{
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try
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{
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var parentScrollViewer = cUiElementHelper.GetFirstParentOfType<ScrollViewer>(this);
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Keyboard.ClearFocus();
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if (parentScrollViewer != null)
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{
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parentScrollViewer.Focus();
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Keyboard.Focus(parentScrollViewer);
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}
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}
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catch (Exception exception)
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{
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LogException(exception);
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}
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}), System.Windows.Threading.DispatcherPriority.Input);
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}
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}
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private void ComboBoxControl_DropDownClosed(object sender, EventArgs e)
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{
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timer.Stop();
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cFocusInvoker.InvokeLostFocus(this, e);
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if (RestoreParentScrollFocusOnDropDownClose)
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{
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_ = Dispatcher.BeginInvoke((Action)(() =>
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{
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try
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{
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var parentScrollViewer = cUiElementHelper.GetFirstParentOfType<ScrollViewer>(this);
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Keyboard.ClearFocus();
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if (parentScrollViewer != null)
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{
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parentScrollViewer.Focus();
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Keyboard.Focus(parentScrollViewer);
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}
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}
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catch (Exception exception)
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{
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LogException(exception);
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}
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}), System.Windows.Threading.DispatcherPriority.Input);
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}
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}
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private void ComboBoxControl_DropDownOpened(object sender, EventArgs e)
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{
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@@ -1,429 +1,438 @@
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using FasdDesktopUi.Basics.Models;
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Threading;
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namespace FasdDesktopUi.Basics.UserControls
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{
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public partial class HierarchicalSelectionControl : UserControl
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{
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private readonly ObservableCollection<HierarchicalSelectionItem> visibleItems = new ObservableCollection<HierarchicalSelectionItem>();
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private readonly Dictionary<string, HierarchicalSelectionItem> itemLookup = new Dictionary<string, HierarchicalSelectionItem>();
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private readonly DispatcherTimer searchDelayTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(250) };
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private string lastSearchText = string.Empty;
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private bool suppressTreeSelectionChanged;
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private TextBox searchTextBox;
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private TreeView treeViewControl;
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private ScrollViewer itemsScrollViewer;
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public ObservableCollection<HierarchicalSelectionItem> VisibleItems => visibleItems;
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public event EventHandler DropDownOpened;
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public event EventHandler DropDownClosed;
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public HierarchicalSelectionControl()
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{
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InitializeComponent();
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searchDelayTimer.Tick += SearchDelayTimer_Tick;
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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EnsureTemplateParts();
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if (treeViewControl != null)
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treeViewControl.ItemsSource = VisibleItems;
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}
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#region DependencyProperties
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public ObservableCollection<HierarchicalSelectionItem> ItemsSource
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{
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get => (ObservableCollection<HierarchicalSelectionItem>)GetValue(ItemsSourceProperty);
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set => SetValue(ItemsSourceProperty, value);
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}
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public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register(
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nameof(ItemsSource),
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typeof(ObservableCollection<HierarchicalSelectionItem>),
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typeof(HierarchicalSelectionControl),
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new PropertyMetadata(null, OnItemsSourceChanged));
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private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is HierarchicalSelectionControl control)
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{
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control.RebuildLookup();
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control.ApplyFilter(control.lastSearchText);
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}
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}
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public HierarchicalSelectionItem SelectedItem
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{
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get => (HierarchicalSelectionItem)GetValue(SelectedItemProperty);
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set => SetValue(SelectedItemProperty, value);
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}
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public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register(
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nameof(SelectedItem),
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typeof(HierarchicalSelectionItem),
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typeof(HierarchicalSelectionControl),
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new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnSelectedItemChanged));
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private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is HierarchicalSelectionControl control)
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{
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control.TryExpandToSelectedItem();
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control.SyncTreeSelectionWithSelectedItem(bringIntoView: false);
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}
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}
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public Brush ComboBoxBackground
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{
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get => (Brush)GetValue(ComboBoxBackgroundProperty);
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set => SetValue(ComboBoxBackgroundProperty, value);
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}
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public static readonly DependencyProperty ComboBoxBackgroundProperty =
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DependencyProperty.Register(nameof(ComboBoxBackground), typeof(Brush), typeof(HierarchicalSelectionControl), new PropertyMetadata(Brushes.Transparent));
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public string SearchPlaceholderText
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{
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get => (string)GetValue(SearchPlaceholderTextProperty);
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set => SetValue(SearchPlaceholderTextProperty, value);
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}
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public static readonly DependencyProperty SearchPlaceholderTextProperty =
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DependencyProperty.Register(nameof(SearchPlaceholderText), typeof(string), typeof(HierarchicalSelectionControl), new PropertyMetadata(string.Empty));
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#endregion
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#region UI Event Handling
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private void ComboBoxControl_DropDownOpened(object sender, EventArgs e)
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{
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EnsureTemplateParts();
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searchTextBox?.Focus();
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searchTextBox?.SelectAll();
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suppressTreeSelectionChanged = false;
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SyncTreeSelectionWithSelectedItem(bringIntoView: true);
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DropDownOpened?.Invoke(this, e);
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}
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private void ComboBoxControl_DropDownClosed(object sender, EventArgs e)
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{
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searchDelayTimer.Stop();
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suppressTreeSelectionChanged = false;
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DropDownClosed?.Invoke(this, e);
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}
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private void SearchTextBox_TextChanged(object sender, TextChangedEventArgs e)
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{
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searchDelayTimer.Stop();
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searchDelayTimer.Start();
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}
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private void SearchDelayTimer_Tick(object sender, EventArgs e)
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{
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searchDelayTimer.Stop();
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lastSearchText = searchTextBox?.Text ?? string.Empty;
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ApplyFilter(lastSearchText);
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}
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private void TreeViewControl_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
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{
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if (suppressTreeSelectionChanged)
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return;
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if (e.NewValue is HierarchicalSelectionItem selected)
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{
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var original = ResolveOriginalItem(selected);
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if (original != null && !Equals(SelectedItem, original))
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{
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SelectedItem = original;
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}
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suppressTreeSelectionChanged = true;
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ComboBoxControl.IsDropDownOpen = false;
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}
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}
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#endregion
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#region Data Preparation and Filtering
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private HierarchicalSelectionItem ResolveOriginalItem(HierarchicalSelectionItem item)
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{
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if (item == null)
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return null;
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if (!string.IsNullOrWhiteSpace(item.Id) && itemLookup.TryGetValue(item.Id, out var original))
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return original;
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return null;
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}
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private void RebuildLookup()
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{
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itemLookup.Clear();
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if (ItemsSource == null)
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return;
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foreach (var entry in ItemsSource.SelectMany(item => item.SelfAndDescendants()))
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{
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if (string.IsNullOrWhiteSpace(entry.Id))
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continue;
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itemLookup[entry.Id] = entry;
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}
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}
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private void ApplyFilter(string searchText)
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{
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visibleItems.Clear();
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if (ItemsSource == null)
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return;
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if (string.IsNullOrWhiteSpace(searchText))
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{
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foreach (var item in ItemsSource)
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{
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item.SetExpandedRecursive(false);
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visibleItems.Add(item);
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}
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TryExpandToSelectedItem();
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SyncTreeSelectionWithSelectedItem(bringIntoView: false);
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return;
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}
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var comparison = StringComparison.CurrentCultureIgnoreCase;
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foreach (var root in ItemsSource)
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{
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var clone = root.CloneBranch(node =>
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node.FullPath?.IndexOf(searchText, comparison) >= 0 ||
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node.DisplayName?.IndexOf(searchText, comparison) >= 0);
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if (clone == null)
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continue;
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clone.SetExpandedRecursive(true);
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visibleItems.Add(clone);
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}
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// If the selected item is part of current results, keep it visually selected.
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SyncTreeSelectionWithSelectedItem(bringIntoView: false);
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}
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private void TryExpandToSelectedItem()
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{
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if (SelectedItem == null || string.IsNullOrWhiteSpace(SelectedItem.Id))
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return;
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if (!string.IsNullOrWhiteSpace(lastSearchText))
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return;
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var chain = SelectedItem;
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while (chain != null)
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{
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chain.IsExpanded = true;
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chain = chain.Parent;
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}
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}
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#endregion
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#region Tree Selection Sync
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private void SyncTreeSelectionWithSelectedItem(bool bringIntoView)
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{
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if (SelectedItem == null || string.IsNullOrWhiteSpace(SelectedItem.Id))
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return;
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EnsureTemplateParts();
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if (treeViewControl == null)
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return;
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// Wait for popup/template layout to finish so item containers are generated.
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Dispatcher.BeginInvoke(new Action(() =>
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{
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var target = FindVisibleItemById(VisibleItems, SelectedItem.Id);
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if (target == null)
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return;
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var ancestor = target.Parent;
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while (ancestor != null)
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{
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ancestor.IsExpanded = true;
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ancestor = ancestor.Parent;
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}
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treeViewControl.UpdateLayout();
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var targetContainer = GetTreeViewItemContainer(treeViewControl, target);
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if (targetContainer == null)
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return;
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suppressTreeSelectionChanged = true;
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try
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{
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targetContainer.IsSelected = true;
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if (bringIntoView)
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targetContainer.BringIntoView();
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}
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finally
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{
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suppressTreeSelectionChanged = false;
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}
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}), DispatcherPriority.Loaded);
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}
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private static HierarchicalSelectionItem FindVisibleItemById(IEnumerable<HierarchicalSelectionItem> items, string id)
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{
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if (items == null || string.IsNullOrWhiteSpace(id))
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return null;
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foreach (var item in items)
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{
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if (item == null)
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continue;
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if (string.Equals(item.Id, id, StringComparison.OrdinalIgnoreCase))
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return item;
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var childMatch = FindVisibleItemById(item.Children, id);
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if (childMatch != null)
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return childMatch;
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}
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return null;
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}
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private static TreeViewItem GetTreeViewItemContainer(ItemsControl root, object targetItem)
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{
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if (root == null || targetItem == null)
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return null;
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var directContainer = root.ItemContainerGenerator.ContainerFromItem(targetItem) as TreeViewItem;
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if (directContainer != null)
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return directContainer;
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foreach (var child in root.Items)
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{
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var childContainer = root.ItemContainerGenerator.ContainerFromItem(child) as TreeViewItem;
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if (childContainer == null)
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continue;
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childContainer.UpdateLayout();
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var result = GetTreeViewItemContainer(childContainer, targetItem);
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if (result != null)
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return result;
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}
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return null;
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}
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#endregion
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#region Template and Scroll Handling
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private void EnsureTemplateParts()
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{
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if (treeViewControl == null)
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{
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treeViewControl = ComboBoxControl.Template.FindName("PART_TreeView", ComboBoxControl) as TreeView;
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if (treeViewControl != null)
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{
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treeViewControl.SelectedItemChanged += TreeViewControl_SelectedItemChanged;
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treeViewControl.ItemsSource = VisibleItems;
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}
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}
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if (searchTextBox == null)
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{
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searchTextBox = ComboBoxControl.Template.FindName("PART_SearchTextBox", ComboBoxControl) as TextBox;
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if (searchTextBox != null)
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searchTextBox.TextChanged += SearchTextBox_TextChanged;
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}
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if (itemsScrollViewer == null)
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{
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itemsScrollViewer = ComboBoxControl.Template.FindName("PART_ItemsScrollViewer", ComboBoxControl) as ScrollViewer;
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}
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}
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private void ItemsScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
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{
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var scroller = itemsScrollViewer ?? sender as ScrollViewer;
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if (scroller == null || scroller.ScrollableHeight <= 0)
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return;
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var lines = SystemParameters.WheelScrollLines;
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if (lines < 0)
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{
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if (e.Delta < 0)
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scroller.PageDown();
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else
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scroller.PageUp();
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e.Handled = true;
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return;
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}
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if (lines == 0)
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{
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scroller.ScrollToVerticalOffset(scroller.VerticalOffset - e.Delta);
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e.Handled = true;
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return;
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}
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var direction = e.Delta < 0 ? 1 : -1;
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var stepCount = Math.Max(1, Math.Abs(e.Delta) / 120) * lines;
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for (var i = 0; i < stepCount; i++)
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{
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if (direction > 0)
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scroller.LineDown();
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else
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scroller.LineUp();
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}
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e.Handled = true;
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}
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#endregion
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#region Keyboard
|
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protected override void OnPreviewKeyDown(KeyEventArgs e)
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{
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base.OnPreviewKeyDown(e);
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|
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if (!IsEnabled)
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return;
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if (!ComboBoxControl.IsDropDownOpen && (e.Key == Key.Enter || e.Key == Key.Down || e.Key == Key.Space))
|
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{
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ComboBoxControl.IsDropDownOpen = true;
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e.Handled = true;
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return;
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}
|
||||
|
||||
if (ComboBoxControl.IsDropDownOpen && e.Key == Key.Escape)
|
||||
{
|
||||
ComboBoxControl.IsDropDownOpen = false;
|
||||
e.Handled = true;
|
||||
}
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
}
|
||||
using FasdDesktopUi.Basics.Models;
|
||||
using System;
|
||||
using System.Collections.Generic;
|
||||
using System.Collections.ObjectModel;
|
||||
using System.Linq;
|
||||
using System.Windows;
|
||||
using System.Windows.Controls;
|
||||
using System.Windows.Input;
|
||||
using System.Windows.Media;
|
||||
using System.Windows.Threading;
|
||||
|
||||
namespace FasdDesktopUi.Basics.UserControls
|
||||
{
|
||||
public partial class HierarchicalSelectionControl : UserControl
|
||||
{
|
||||
private readonly ObservableCollection<HierarchicalSelectionItem> visibleItems = new ObservableCollection<HierarchicalSelectionItem>();
|
||||
private readonly Dictionary<string, HierarchicalSelectionItem> itemLookup = new Dictionary<string, HierarchicalSelectionItem>();
|
||||
private readonly DispatcherTimer searchDelayTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(250) };
|
||||
private string lastSearchText = string.Empty;
|
||||
private bool suppressTreeSelectionChanged;
|
||||
|
||||
private TextBox searchTextBox;
|
||||
private TreeView treeViewControl;
|
||||
private ScrollViewer itemsScrollViewer;
|
||||
|
||||
public ObservableCollection<HierarchicalSelectionItem> VisibleItems => visibleItems;
|
||||
|
||||
public event EventHandler DropDownOpened;
|
||||
public event EventHandler DropDownClosed;
|
||||
|
||||
public HierarchicalSelectionControl()
|
||||
{
|
||||
InitializeComponent();
|
||||
searchDelayTimer.Tick += SearchDelayTimer_Tick;
|
||||
}
|
||||
|
||||
public bool CloseDropDownIfOpen()
|
||||
{
|
||||
if (ComboBoxControl?.IsDropDownOpen != true)
|
||||
return false;
|
||||
|
||||
ComboBoxControl.IsDropDownOpen = false;
|
||||
return true;
|
||||
}
|
||||
|
||||
public override void OnApplyTemplate()
|
||||
{
|
||||
base.OnApplyTemplate();
|
||||
EnsureTemplateParts();
|
||||
if (treeViewControl != null)
|
||||
treeViewControl.ItemsSource = VisibleItems;
|
||||
}
|
||||
|
||||
#region DependencyProperties
|
||||
|
||||
public ObservableCollection<HierarchicalSelectionItem> ItemsSource
|
||||
{
|
||||
get => (ObservableCollection<HierarchicalSelectionItem>)GetValue(ItemsSourceProperty);
|
||||
set => SetValue(ItemsSourceProperty, value);
|
||||
}
|
||||
|
||||
public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register(
|
||||
nameof(ItemsSource),
|
||||
typeof(ObservableCollection<HierarchicalSelectionItem>),
|
||||
typeof(HierarchicalSelectionControl),
|
||||
new PropertyMetadata(null, OnItemsSourceChanged));
|
||||
|
||||
private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
|
||||
{
|
||||
if (d is HierarchicalSelectionControl control)
|
||||
{
|
||||
control.RebuildLookup();
|
||||
control.ApplyFilter(control.lastSearchText);
|
||||
}
|
||||
}
|
||||
|
||||
public HierarchicalSelectionItem SelectedItem
|
||||
{
|
||||
get => (HierarchicalSelectionItem)GetValue(SelectedItemProperty);
|
||||
set => SetValue(SelectedItemProperty, value);
|
||||
}
|
||||
|
||||
public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register(
|
||||
nameof(SelectedItem),
|
||||
typeof(HierarchicalSelectionItem),
|
||||
typeof(HierarchicalSelectionControl),
|
||||
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnSelectedItemChanged));
|
||||
|
||||
private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
|
||||
{
|
||||
if (d is HierarchicalSelectionControl control)
|
||||
{
|
||||
control.TryExpandToSelectedItem();
|
||||
control.SyncTreeSelectionWithSelectedItem(bringIntoView: false);
|
||||
}
|
||||
}
|
||||
|
||||
public Brush ComboBoxBackground
|
||||
{
|
||||
get => (Brush)GetValue(ComboBoxBackgroundProperty);
|
||||
set => SetValue(ComboBoxBackgroundProperty, value);
|
||||
}
|
||||
|
||||
public static readonly DependencyProperty ComboBoxBackgroundProperty =
|
||||
DependencyProperty.Register(nameof(ComboBoxBackground), typeof(Brush), typeof(HierarchicalSelectionControl), new PropertyMetadata(Brushes.Transparent));
|
||||
|
||||
public string SearchPlaceholderText
|
||||
{
|
||||
get => (string)GetValue(SearchPlaceholderTextProperty);
|
||||
set => SetValue(SearchPlaceholderTextProperty, value);
|
||||
}
|
||||
|
||||
public static readonly DependencyProperty SearchPlaceholderTextProperty =
|
||||
DependencyProperty.Register(nameof(SearchPlaceholderText), typeof(string), typeof(HierarchicalSelectionControl), new PropertyMetadata(string.Empty));
|
||||
|
||||
#endregion
|
||||
|
||||
#region UI Event Handling
|
||||
|
||||
private void ComboBoxControl_DropDownOpened(object sender, EventArgs e)
|
||||
{
|
||||
EnsureTemplateParts();
|
||||
searchTextBox?.Focus();
|
||||
searchTextBox?.SelectAll();
|
||||
suppressTreeSelectionChanged = false;
|
||||
SyncTreeSelectionWithSelectedItem(bringIntoView: true);
|
||||
DropDownOpened?.Invoke(this, e);
|
||||
}
|
||||
|
||||
private void ComboBoxControl_DropDownClosed(object sender, EventArgs e)
|
||||
{
|
||||
searchDelayTimer.Stop();
|
||||
suppressTreeSelectionChanged = false;
|
||||
DropDownClosed?.Invoke(this, e);
|
||||
}
|
||||
|
||||
private void SearchTextBox_TextChanged(object sender, TextChangedEventArgs e)
|
||||
{
|
||||
searchDelayTimer.Stop();
|
||||
searchDelayTimer.Start();
|
||||
}
|
||||
|
||||
private void SearchDelayTimer_Tick(object sender, EventArgs e)
|
||||
{
|
||||
searchDelayTimer.Stop();
|
||||
lastSearchText = searchTextBox?.Text ?? string.Empty;
|
||||
ApplyFilter(lastSearchText);
|
||||
}
|
||||
|
||||
private void TreeViewControl_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
|
||||
{
|
||||
if (suppressTreeSelectionChanged)
|
||||
return;
|
||||
|
||||
if (e.NewValue is HierarchicalSelectionItem selected)
|
||||
{
|
||||
var original = ResolveOriginalItem(selected);
|
||||
if (original != null && !Equals(SelectedItem, original))
|
||||
{
|
||||
SelectedItem = original;
|
||||
}
|
||||
|
||||
suppressTreeSelectionChanged = true;
|
||||
ComboBoxControl.IsDropDownOpen = false;
|
||||
}
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Data Preparation and Filtering
|
||||
|
||||
private HierarchicalSelectionItem ResolveOriginalItem(HierarchicalSelectionItem item)
|
||||
{
|
||||
if (item == null)
|
||||
return null;
|
||||
|
||||
if (!string.IsNullOrWhiteSpace(item.Id) && itemLookup.TryGetValue(item.Id, out var original))
|
||||
return original;
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
private void RebuildLookup()
|
||||
{
|
||||
itemLookup.Clear();
|
||||
|
||||
if (ItemsSource == null)
|
||||
return;
|
||||
|
||||
foreach (var entry in ItemsSource.SelectMany(item => item.SelfAndDescendants()))
|
||||
{
|
||||
if (string.IsNullOrWhiteSpace(entry.Id))
|
||||
continue;
|
||||
|
||||
itemLookup[entry.Id] = entry;
|
||||
}
|
||||
}
|
||||
|
||||
private void ApplyFilter(string searchText)
|
||||
{
|
||||
visibleItems.Clear();
|
||||
|
||||
if (ItemsSource == null)
|
||||
return;
|
||||
|
||||
if (string.IsNullOrWhiteSpace(searchText))
|
||||
{
|
||||
foreach (var item in ItemsSource)
|
||||
{
|
||||
item.SetExpandedRecursive(false);
|
||||
visibleItems.Add(item);
|
||||
}
|
||||
|
||||
TryExpandToSelectedItem();
|
||||
SyncTreeSelectionWithSelectedItem(bringIntoView: false);
|
||||
return;
|
||||
}
|
||||
|
||||
var comparison = StringComparison.CurrentCultureIgnoreCase;
|
||||
|
||||
foreach (var root in ItemsSource)
|
||||
{
|
||||
var clone = root.CloneBranch(node =>
|
||||
node.FullPath?.IndexOf(searchText, comparison) >= 0 ||
|
||||
node.DisplayName?.IndexOf(searchText, comparison) >= 0);
|
||||
|
||||
if (clone == null)
|
||||
continue;
|
||||
|
||||
clone.SetExpandedRecursive(true);
|
||||
visibleItems.Add(clone);
|
||||
}
|
||||
|
||||
// If the selected item is part of current results, keep it visually selected.
|
||||
SyncTreeSelectionWithSelectedItem(bringIntoView: false);
|
||||
}
|
||||
|
||||
private void TryExpandToSelectedItem()
|
||||
{
|
||||
if (SelectedItem == null || string.IsNullOrWhiteSpace(SelectedItem.Id))
|
||||
return;
|
||||
|
||||
if (!string.IsNullOrWhiteSpace(lastSearchText))
|
||||
return;
|
||||
|
||||
var chain = SelectedItem;
|
||||
while (chain != null)
|
||||
{
|
||||
chain.IsExpanded = true;
|
||||
chain = chain.Parent;
|
||||
}
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Tree Selection Sync
|
||||
|
||||
private void SyncTreeSelectionWithSelectedItem(bool bringIntoView)
|
||||
{
|
||||
if (SelectedItem == null || string.IsNullOrWhiteSpace(SelectedItem.Id))
|
||||
return;
|
||||
|
||||
EnsureTemplateParts();
|
||||
if (treeViewControl == null)
|
||||
return;
|
||||
|
||||
// Wait for popup/template layout to finish so item containers are generated.
|
||||
Dispatcher.BeginInvoke(new Action(() =>
|
||||
{
|
||||
var target = FindVisibleItemById(VisibleItems, SelectedItem.Id);
|
||||
if (target == null)
|
||||
return;
|
||||
|
||||
var ancestor = target.Parent;
|
||||
while (ancestor != null)
|
||||
{
|
||||
ancestor.IsExpanded = true;
|
||||
ancestor = ancestor.Parent;
|
||||
}
|
||||
|
||||
treeViewControl.UpdateLayout();
|
||||
var targetContainer = GetTreeViewItemContainer(treeViewControl, target);
|
||||
if (targetContainer == null)
|
||||
return;
|
||||
|
||||
suppressTreeSelectionChanged = true;
|
||||
try
|
||||
{
|
||||
targetContainer.IsSelected = true;
|
||||
if (bringIntoView)
|
||||
targetContainer.BringIntoView();
|
||||
}
|
||||
finally
|
||||
{
|
||||
suppressTreeSelectionChanged = false;
|
||||
}
|
||||
}), DispatcherPriority.Loaded);
|
||||
}
|
||||
|
||||
private static HierarchicalSelectionItem FindVisibleItemById(IEnumerable<HierarchicalSelectionItem> items, string id)
|
||||
{
|
||||
if (items == null || string.IsNullOrWhiteSpace(id))
|
||||
return null;
|
||||
|
||||
foreach (var item in items)
|
||||
{
|
||||
if (item == null)
|
||||
continue;
|
||||
|
||||
if (string.Equals(item.Id, id, StringComparison.OrdinalIgnoreCase))
|
||||
return item;
|
||||
|
||||
var childMatch = FindVisibleItemById(item.Children, id);
|
||||
if (childMatch != null)
|
||||
return childMatch;
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
private static TreeViewItem GetTreeViewItemContainer(ItemsControl root, object targetItem)
|
||||
{
|
||||
if (root == null || targetItem == null)
|
||||
return null;
|
||||
|
||||
var directContainer = root.ItemContainerGenerator.ContainerFromItem(targetItem) as TreeViewItem;
|
||||
if (directContainer != null)
|
||||
return directContainer;
|
||||
|
||||
foreach (var child in root.Items)
|
||||
{
|
||||
var childContainer = root.ItemContainerGenerator.ContainerFromItem(child) as TreeViewItem;
|
||||
if (childContainer == null)
|
||||
continue;
|
||||
|
||||
childContainer.UpdateLayout();
|
||||
var result = GetTreeViewItemContainer(childContainer, targetItem);
|
||||
if (result != null)
|
||||
return result;
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Template and Scroll Handling
|
||||
|
||||
private void EnsureTemplateParts()
|
||||
{
|
||||
if (treeViewControl == null)
|
||||
{
|
||||
treeViewControl = ComboBoxControl.Template.FindName("PART_TreeView", ComboBoxControl) as TreeView;
|
||||
if (treeViewControl != null)
|
||||
{
|
||||
treeViewControl.SelectedItemChanged += TreeViewControl_SelectedItemChanged;
|
||||
treeViewControl.ItemsSource = VisibleItems;
|
||||
}
|
||||
}
|
||||
|
||||
if (searchTextBox == null)
|
||||
{
|
||||
searchTextBox = ComboBoxControl.Template.FindName("PART_SearchTextBox", ComboBoxControl) as TextBox;
|
||||
if (searchTextBox != null)
|
||||
searchTextBox.TextChanged += SearchTextBox_TextChanged;
|
||||
}
|
||||
|
||||
if (itemsScrollViewer == null)
|
||||
{
|
||||
itemsScrollViewer = ComboBoxControl.Template.FindName("PART_ItemsScrollViewer", ComboBoxControl) as ScrollViewer;
|
||||
}
|
||||
}
|
||||
|
||||
private void ItemsScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
|
||||
{
|
||||
var scroller = itemsScrollViewer ?? sender as ScrollViewer;
|
||||
if (scroller == null || scroller.ScrollableHeight <= 0)
|
||||
return;
|
||||
|
||||
var lines = SystemParameters.WheelScrollLines;
|
||||
if (lines < 0)
|
||||
{
|
||||
if (e.Delta < 0)
|
||||
scroller.PageDown();
|
||||
else
|
||||
scroller.PageUp();
|
||||
e.Handled = true;
|
||||
return;
|
||||
}
|
||||
|
||||
if (lines == 0)
|
||||
{
|
||||
scroller.ScrollToVerticalOffset(scroller.VerticalOffset - e.Delta);
|
||||
e.Handled = true;
|
||||
return;
|
||||
}
|
||||
|
||||
var direction = e.Delta < 0 ? 1 : -1;
|
||||
var stepCount = Math.Max(1, Math.Abs(e.Delta) / 120) * lines;
|
||||
for (var i = 0; i < stepCount; i++)
|
||||
{
|
||||
if (direction > 0)
|
||||
scroller.LineDown();
|
||||
else
|
||||
scroller.LineUp();
|
||||
}
|
||||
|
||||
e.Handled = true;
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Keyboard
|
||||
|
||||
protected override void OnPreviewKeyDown(KeyEventArgs e)
|
||||
{
|
||||
base.OnPreviewKeyDown(e);
|
||||
|
||||
if (!IsEnabled)
|
||||
return;
|
||||
|
||||
if (!ComboBoxControl.IsDropDownOpen && (e.Key == Key.Enter || e.Key == Key.Down || e.Key == Key.Space))
|
||||
{
|
||||
ComboBoxControl.IsDropDownOpen = true;
|
||||
e.Handled = true;
|
||||
return;
|
||||
}
|
||||
|
||||
if (ComboBoxControl.IsDropDownOpen && e.Key == Key.Escape)
|
||||
{
|
||||
ComboBoxControl.IsDropDownOpen = false;
|
||||
e.Handled = true;
|
||||
}
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
}
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user