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tom-englerttom-englert
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Fix #69: MultipleChoiceFilter introduces reflection-only dependency to TomsToolbox.Wpf
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+236
-4
lines changed

3 files changed

+236
-4
lines changed

‎src/DataGridExtensions/ListBoxSelectAllBehavior.cs‎

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namespace DataGridExtensions
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{
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using System;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using Microsoft.Xaml.Behaviors;
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using TomsToolbox.Wpf;
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/// <summary>
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/// A behavior for a list box to handle the interaction between the list box and a "select all" checkbox.
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/// </summary>
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/// <seealso cref="Behavior{T}" />
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internal class ListBoxSelectAllBehavior : Behavior<ListBox>
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{
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private readonly DispatcherThrottle _collectionChangedThrottle;
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private bool _isListBoxUpdating;
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/// <summary>
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/// Initializes a new instance of the <see cref="ListBoxSelectAllBehavior"/> class.
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/// </summary>
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public ListBoxSelectAllBehavior()
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{
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_collectionChangedThrottle = new DispatcherThrottle(ListBox_CollectionChanged);
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}
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/// <summary>
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/// Gets or sets a flag indicating if all files are selected. Bind this property to the <see cref="ToggleButton.IsChecked"/> property of a three state check box.
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/// </summary>
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public bool? AreAllFilesSelected
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{
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get => (bool?)GetValue(AreAllFilesSelectedProperty);
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set => SetValue(AreAllFilesSelectedProperty, value);
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}
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/// <summary>
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/// Identifies the <see cref="AreAllFilesSelected"/> dependency property
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/// </summary>
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public static readonly DependencyProperty AreAllFilesSelectedProperty =
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DependencyProperty.Register("AreAllFilesSelected", typeof(bool?), typeof(ListBoxSelectAllBehavior), new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, (sender, e) => ((ListBoxSelectAllBehavior)sender)?.AreAllFilesSelected_Changed((bool?)e.NewValue)));
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/// <summary>
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/// Called after the behavior is attached to an AssociatedObject.
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/// </summary>
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/// <remarks>
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/// Override this to hook up functionality to the AssociatedObject.
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/// </remarks>
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protected override void OnAttached()
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{
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base.OnAttached();
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var listBox = AssociatedObject;
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if ((listBox == null) || DesignerProperties.GetIsInDesignMode(listBox))
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return;
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listBox.SelectAll();
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listBox.SelectionChanged += ListBox_SelectionChanged;
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((INotifyCollectionChanged)listBox.Items).CollectionChanged += (_, __) => _collectionChangedThrottle.Tick();
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}
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private void ListBox_SelectionChanged(object? sender, EventArgs? e)
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{
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var listBox = AssociatedObject;
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if (listBox == null)
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return;
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try
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{
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_isListBoxUpdating = true;
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if (listBox.Items.Count == listBox.SelectedItems.Count)
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{
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AreAllFilesSelected = true;
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}
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else if (listBox.SelectedItems.Count == 0)
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{
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AreAllFilesSelected = false;
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}
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else
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{
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AreAllFilesSelected = null;
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}
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}
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finally
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{
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_isListBoxUpdating = false;
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}
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}
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private void ListBox_CollectionChanged()
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{
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var listBox = AssociatedObject;
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if (AreAllFilesSelected.GetValueOrDefault())
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{
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listBox?.SelectAll();
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}
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}
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private void AreAllFilesSelected_Changed(bool? newValue)
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{
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var listBox = AssociatedObject;
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if (listBox == null)
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return;
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if (_isListBoxUpdating)
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return;
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if (newValue == null)
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{
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Dispatcher?.BeginInvoke(() => AreAllFilesSelected = false);
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return;
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}
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if (newValue.GetValueOrDefault())
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{
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listBox.SelectAll();
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}
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else
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{
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listBox.SelectedIndex = -1;
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}
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}
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}
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}

‎src/DataGridExtensions/PopupFocusManagerBehavior.cs‎

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namespace DataGridExtensions
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{
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using System;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls.Primitives;
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using System.Windows.Input;
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using Microsoft.Xaml.Behaviors;
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using TomsToolbox.Wpf;
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/// <summary>
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/// Handle focus for popups opened by toggle buttons.
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/// When the popup opens, the focus is set to the first focusable control in the popup.
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/// When the popup closes, the focus is set back to the button.
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/// </summary>
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internal class PopupFocusManagerBehavior : Behavior<Popup>
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{
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/// <summary>
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/// Gets or sets the toggle button that controls the popup.
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/// </summary>
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public ToggleButton? ToggleButton
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{
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get => (ToggleButton)GetValue(ToggleButtonProperty);
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set => SetValue(ToggleButtonProperty, value);
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}
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/// <summary>
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/// Identifies the <see cref="ToggleButton"/> dependency property.
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/// </summary>
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public static readonly DependencyProperty ToggleButtonProperty =
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DependencyProperty.Register("ToggleButton", typeof(ToggleButton), typeof(PopupFocusManagerBehavior));
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/// <summary>
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/// Called after the behavior is attached to an AssociatedObject.
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/// </summary>
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/// <remarks>
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/// Override this to hook up functionality to the AssociatedObject.
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/// </remarks>
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protected override void OnAttached()
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{
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base.OnAttached();
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var popup = AssociatedObject;
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popup.IsKeyboardFocusWithinChanged += Popup_IsKeyboardFocusWithinChanged;
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popup.Opened += Popup_Opened;
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popup.KeyDown += Popup_KeyDown;
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}
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/// <summary>
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/// Called when the behavior is being detached from its AssociatedObject, but before it has actually occurred.
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/// </summary>
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/// <remarks>
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/// Override this to unhook functionality from the AssociatedObject.
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/// </remarks>
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protected override void OnDetaching()
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{
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base.OnDetaching();
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var popup = AssociatedObject;
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popup.IsKeyboardFocusWithinChanged -= Popup_IsKeyboardFocusWithinChanged;
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popup.Opened -= Popup_Opened;
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popup.KeyDown -= Popup_KeyDown;
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}
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private void Popup_KeyDown(object? sender, KeyEventArgs? e)
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{
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if (ToggleButton == null)
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return;
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switch (e?.Key)
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{
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case Key.Escape:
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case Key.Enter:
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case Key.Tab:
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ToggleButton.Focus();
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break;
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}
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}
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private void Popup_Opened(object? sender, EventArgs? e)
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{
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if (!(sender is Popup popup))
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return;
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var child = popup.Child;
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var focusable = child?.VisualDescendantsAndSelf().OfType<UIElement>().FirstOrDefault(item => item.Focusable);
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if (focusable != null)
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{
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popup.BeginInvoke(() => focusable.Focus());
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}
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}
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private void Popup_IsKeyboardFocusWithinChanged(object? sender, DependencyPropertyChangedEventArgs e)
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{
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if (Equals(e.NewValue, false) && (ToggleButton != null))
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{
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ToggleButton.IsChecked = false;
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}
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}
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}
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}

‎src/DataGridExtensions/Themes/Generic.xaml‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -3,8 +3,7 @@
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xmlns:src="clr-namespace:DataGridExtensions"
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xmlns:behaviors="clr-namespace:DataGridExtensions.Behaviors"
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xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
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xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
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xmlns:toms="urn:TomsToolbox">
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xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase">
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<!-- Style for a filter check box. The check box is only visible when it's hovered, focused or has a value. -->
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<Style x:Key="{x:Static src:DataGridFilter.ColumnHeaderSearchCheckBoxStyleKey}" TargetType="CheckBox">
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</CollectionViewSource>
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</FrameworkElement.Resources>
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<i:Interaction.Behaviors>
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<toms:PopupFocusManagerBehavior ToggleButton="{Binding ElementName=ToggleButton}" />
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<src:PopupFocusManagerBehavior ToggleButton="{Binding ElementName=ToggleButton}" />
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</i:Interaction.Behaviors>
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<Border Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" BorderThickness="1" BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}">
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<DockPanel>
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</DataTemplate>
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</ListBox.ItemTemplate>
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<i:Interaction.Behaviors>
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<toms:ListBoxSelectAllBehavior AreAllFilesSelected="{Binding IsChecked, ElementName=SelectAll}" />
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<src:ListBoxSelectAllBehavior AreAllFilesSelected="{Binding IsChecked, ElementName=SelectAll}" />
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</i:Interaction.Behaviors>
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</ListBox>
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</DockPanel>

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