Sicherung
This commit is contained in:
Maier Stephan SI
612
AutoCompleteTextBox/Editors/AutoCompleteComboBox.cs
Normal file
612
AutoCompleteTextBox/Editors/AutoCompleteComboBox.cs
Normal file
@@ -0,0 +1,612 @@
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using System;
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using System.Collections;
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using System.Threading;
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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 System.Windows.Data;
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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 AutoCompleteTextBox.Editors
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{
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[TemplatePart(Name = PartEditor, Type = typeof(TextBox))]
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[TemplatePart(Name = PartPopup, Type = typeof(Popup))]
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[TemplatePart(Name = PartSelector, Type = typeof(Selector))]
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[TemplatePart(Name = PartExpander, Type = typeof(Expander))]
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public class AutoCompleteComboBox : Control
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{
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#region "Fields"
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public const string PartEditor = "PART_Editor";
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public const string PartPopup = "PART_Popup";
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public const string PartSelector = "PART_Selector";
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public const string PartExpander = "PART_Expander";
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public static readonly DependencyProperty DelayProperty = DependencyProperty.Register("Delay", typeof(int), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(200));
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public static readonly DependencyProperty DisplayMemberProperty = DependencyProperty.Register("DisplayMember", typeof(string), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(string.Empty));
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public static readonly DependencyProperty IconPlacementProperty = DependencyProperty.Register("IconPlacement", typeof(IconPlacement), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(IconPlacement.Left));
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public static readonly DependencyProperty IconProperty = DependencyProperty.Register("Icon", typeof(object), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(null));
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public static readonly DependencyProperty IconVisibilityProperty = DependencyProperty.Register("IconVisibility", typeof(Visibility), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(Visibility.Visible));
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public static readonly DependencyProperty IsDropDownOpenProperty = DependencyProperty.Register("IsDropDownOpen", typeof(bool), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(false));
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public static readonly DependencyProperty IsLoadingProperty = DependencyProperty.Register("IsLoading", typeof(bool), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(false));
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public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(false));
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public static readonly DependencyProperty ItemTemplateProperty = DependencyProperty.Register("ItemTemplate", typeof(DataTemplate), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(null));
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public static readonly DependencyProperty ItemTemplateSelectorProperty = DependencyProperty.Register("ItemTemplateSelector", typeof(DataTemplateSelector), typeof(AutoCompleteComboBox));
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public static readonly DependencyProperty LoadingContentProperty = DependencyProperty.Register("LoadingContent", typeof(object), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(null));
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public static readonly DependencyProperty ProviderProperty = DependencyProperty.Register("Provider", typeof(IComboSuggestionProvider), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(null));
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public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register("SelectedItem", typeof(object), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(null, OnSelectedItemChanged));
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public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(string.Empty, propertyChangedCallback: null, coerceValueCallback: null, isAnimationProhibited: false, defaultUpdateSourceTrigger: UpdateSourceTrigger.LostFocus, flags: FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
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public static readonly DependencyProperty FilterProperty = DependencyProperty.Register("Filter", typeof(string), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(string.Empty));
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public static readonly DependencyProperty MaxLengthProperty = DependencyProperty.Register("MaxLength", typeof(int), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(0));
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public static readonly DependencyProperty CharacterCasingProperty = DependencyProperty.Register("CharacterCasing", typeof(CharacterCasing), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(CharacterCasing.Normal));
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public static readonly DependencyProperty MaxPopUpHeightProperty = DependencyProperty.Register("MaxPopUpHeight", typeof(int), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(600));
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public static readonly DependencyProperty MaxPopUpWidthProperty = DependencyProperty.Register("MaxPopUpWidth", typeof(int), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(2000));
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public static readonly DependencyProperty WatermarkProperty = DependencyProperty.Register("Watermark", typeof(string), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(string.Empty));
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public static readonly DependencyProperty SuggestionBackgroundProperty = DependencyProperty.Register("SuggestionBackground", typeof(Brush), typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(Brushes.White));
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private bool _isUpdatingText;
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private bool _selectionCancelled;
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private SuggestionsAdapter _suggestionsAdapter;
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#endregion
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#region "Constructors"
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static AutoCompleteComboBox()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(AutoCompleteComboBox), new FrameworkPropertyMetadata(typeof(AutoCompleteComboBox)));
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}
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#endregion
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#region "Properties"
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public int MaxPopupHeight
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{
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get => (int)GetValue(MaxPopUpHeightProperty);
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set => SetValue(MaxPopUpHeightProperty, value);
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}
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public int MaxPopupWidth
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{
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get => (int)GetValue(MaxPopUpWidthProperty);
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set => SetValue(MaxPopUpWidthProperty, value);
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}
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public BindingEvaluator BindingEvaluator { get; set; }
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public CharacterCasing CharacterCasing
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{
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get => (CharacterCasing)GetValue(CharacterCasingProperty);
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set => SetValue(CharacterCasingProperty, value);
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}
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public int MaxLength
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{
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get => (int)GetValue(MaxLengthProperty);
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set => SetValue(MaxLengthProperty, value);
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}
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public int Delay
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{
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get => (int)GetValue(DelayProperty);
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set => SetValue(DelayProperty, value);
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}
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public string DisplayMember
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{
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get => (string)GetValue(DisplayMemberProperty);
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set => SetValue(DisplayMemberProperty, value);
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}
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public TextBox Editor { get; set; }
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public Expander Expander { get; set; }
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public DispatcherTimer FetchTimer { get; set; }
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public string Filter
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{
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get => (string)GetValue(FilterProperty);
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set => SetValue(FilterProperty, value);
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}
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public object Icon
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{
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get => GetValue(IconProperty);
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set => SetValue(IconProperty, value);
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}
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public IconPlacement IconPlacement
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{
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get => (IconPlacement)GetValue(IconPlacementProperty);
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set => SetValue(IconPlacementProperty, value);
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}
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public Visibility IconVisibility
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{
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get => (Visibility)GetValue(IconVisibilityProperty);
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set => SetValue(IconVisibilityProperty, value);
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}
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public bool IsDropDownOpen
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{
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get => (bool)GetValue(IsDropDownOpenProperty);
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set
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{
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this.Expander.IsExpanded = value;
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SetValue(IsDropDownOpenProperty, value);
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}
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}
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public bool IsLoading
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{
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get => (bool)GetValue(IsLoadingProperty);
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set => SetValue(IsLoadingProperty, value);
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}
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public bool IsReadOnly
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{
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get => (bool)GetValue(IsReadOnlyProperty);
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set => SetValue(IsReadOnlyProperty, value);
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}
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public Selector ItemsSelector { get; set; }
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public DataTemplate ItemTemplate
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{
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get => (DataTemplate)GetValue(ItemTemplateProperty);
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set => SetValue(ItemTemplateProperty, value);
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}
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public DataTemplateSelector ItemTemplateSelector
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{
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get => ((DataTemplateSelector)(GetValue(ItemTemplateSelectorProperty)));
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set => SetValue(ItemTemplateSelectorProperty, value);
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}
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public object LoadingContent
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{
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get => GetValue(LoadingContentProperty);
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set => SetValue(LoadingContentProperty, value);
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}
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public Popup Popup { get; set; }
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public IComboSuggestionProvider Provider
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{
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get => (IComboSuggestionProvider)GetValue(ProviderProperty);
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set => SetValue(ProviderProperty, value);
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}
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public object SelectedItem
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{
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get => GetValue(SelectedItemProperty);
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set => SetValue(SelectedItemProperty, value);
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}
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public SelectionAdapter SelectionAdapter { get; set; }
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public string Text
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{
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get => (string)GetValue(TextProperty);
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set => SetValue(TextProperty, value);
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}
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public string Watermark
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{
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get => (string)GetValue(WatermarkProperty);
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set => SetValue(WatermarkProperty, value);
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}
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public Brush SuggestionBackground
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{
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get => (Brush)GetValue(SuggestionBackgroundProperty);
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set => SetValue(SuggestionBackgroundProperty, value);
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}
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#endregion
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#region "Methods"
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public static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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AutoCompleteComboBox act = null;
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act = d as AutoCompleteComboBox;
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if (act != null)
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{
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if (act.Editor != null & !act._isUpdatingText)
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{
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act._isUpdatingText = true;
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act.Editor.Text = act.BindingEvaluator.Evaluate(e.NewValue);
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act._isUpdatingText = false;
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}
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}
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}
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private void ScrollToSelectedItem()
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{
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if (ItemsSelector is ListBox listBox && listBox.SelectedItem != null)
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listBox.ScrollIntoView(listBox.SelectedItem);
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}
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public new BindingExpressionBase SetBinding(DependencyProperty dp, BindingBase binding){
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var res = base.SetBinding(dp, binding);
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CheckForParentTextBindingChange();
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return res;
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}
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public new BindingExpressionBase SetBinding(DependencyProperty dp, String path) {
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var res = base.SetBinding(dp, path);
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CheckForParentTextBindingChange();
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return res;
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}
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public new void ClearValue(DependencyPropertyKey key) {
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base.ClearValue(key);
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CheckForParentTextBindingChange();
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}
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public new void ClearValue(DependencyProperty dp) {
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base.ClearValue(dp);
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CheckForParentTextBindingChange();
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}
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private void CheckForParentTextBindingChange(bool force=false) {
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var CurrentBindingMode = BindingOperations.GetBinding(this, TextProperty)?.UpdateSourceTrigger ?? UpdateSourceTrigger.Default;
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if (CurrentBindingMode != UpdateSourceTrigger.PropertyChanged)//preventing going any less frequent than property changed
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CurrentBindingMode = UpdateSourceTrigger.Default;
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if (CurrentBindingMode == CurrentTextboxTextBindingUpdateMode && force == false)
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return;
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var binding = new Binding {
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Mode = BindingMode.TwoWay,
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UpdateSourceTrigger = CurrentBindingMode,
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Path = new PropertyPath(nameof(Text)),
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RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),
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};
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CurrentTextboxTextBindingUpdateMode = CurrentBindingMode;
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Editor?.SetBinding(TextBox.TextProperty, binding);
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}
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private UpdateSourceTrigger CurrentTextboxTextBindingUpdateMode;
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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Editor = Template.FindName(PartEditor, this) as TextBox;
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Popup = Template.FindName(PartPopup, this) as Popup;
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ItemsSelector = Template.FindName(PartSelector, this) as Selector;
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Expander = Template.FindName(PartExpander, this) as Expander;
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BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
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if (Editor != null)
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{
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Editor.TextChanged += OnEditorTextChanged;
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Editor.PreviewKeyDown += OnEditorKeyDown;
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Editor.LostFocus += OnEditorLostFocus;
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CheckForParentTextBindingChange(true);
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if (SelectedItem != null)
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{
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_isUpdatingText = true;
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Editor.Text = BindingEvaluator.Evaluate(SelectedItem);
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_isUpdatingText = false;
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}
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}
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if (Expander != null)
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{
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Expander.IsExpanded = false;
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Expander.Collapsed += Expander_Expanded;
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Expander.Expanded += Expander_Expanded;
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}
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GotFocus += AutoCompleteComboBox_GotFocus;
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if (Popup != null)
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{
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Popup.StaysOpen = false;
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Popup.Opened += OnPopupOpened;
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Popup.Closed += OnPopupClosed;
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}
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if (ItemsSelector != null)
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{
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SelectionAdapter = new SelectionAdapter(ItemsSelector);
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SelectionAdapter.Commit += OnSelectionAdapterCommit;
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SelectionAdapter.Cancel += OnSelectionAdapterCancel;
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SelectionAdapter.SelectionChanged += OnSelectionAdapterSelectionChanged;
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ItemsSelector.PreviewMouseDown += ItemsSelector_PreviewMouseDown;
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}
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}
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private void Expander_Expanded(object sender, RoutedEventArgs e)
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{
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this.IsDropDownOpen = Expander.IsExpanded;
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if (!this.IsDropDownOpen)
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{
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return;
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}
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if (_suggestionsAdapter == null)
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{
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_suggestionsAdapter = new SuggestionsAdapter(this);
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}
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if (SelectedItem != null || String.IsNullOrWhiteSpace(Editor.Text))
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_suggestionsAdapter.ShowFullCollection();
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}
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private void ItemsSelector_PreviewMouseDown(object sender, MouseButtonEventArgs e)
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{
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if ((e.OriginalSource as FrameworkElement)?.DataContext == null)
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return;
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if (!ItemsSelector.Items.Contains(((FrameworkElement)e.OriginalSource)?.DataContext))
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return;
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ItemsSelector.SelectedItem = ((FrameworkElement)e.OriginalSource)?.DataContext;
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OnSelectionAdapterCommit(SelectionAdapter.EventCause.ItemClicked);
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e.Handled = true;
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}
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private void AutoCompleteComboBox_GotFocus(object sender, RoutedEventArgs e)
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{
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Editor?.Focus();
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}
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private string GetDisplayText(object dataItem)
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{
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if (BindingEvaluator == null)
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{
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BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
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}
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if (dataItem == null)
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{
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return string.Empty;
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}
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if (string.IsNullOrEmpty(DisplayMember))
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{
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return dataItem.ToString();
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}
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return BindingEvaluator.Evaluate(dataItem);
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}
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private void OnEditorKeyDown(object sender, KeyEventArgs e)
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{
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if (SelectionAdapter != null)
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{
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if (IsDropDownOpen)
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SelectionAdapter.HandleKeyDown(e);
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else
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IsDropDownOpen = e.Key == Key.Down || e.Key == Key.Up;
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}
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}
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private void OnEditorLostFocus(object sender, RoutedEventArgs e)
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{
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if (!IsKeyboardFocusWithin)
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{
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IsDropDownOpen = false;
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}
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}
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private void OnEditorTextChanged(object sender, TextChangedEventArgs e)
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{
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Text = Editor.Text;
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if (_isUpdatingText)
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return;
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if (FetchTimer == null)
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{
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FetchTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(Delay) };
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FetchTimer.Tick += OnFetchTimerTick;
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}
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FetchTimer.IsEnabled = false;
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FetchTimer.Stop();
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SetSelectedItem(null);
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if (Editor.Text.Length > 0)
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{
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FetchTimer.IsEnabled = true;
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FetchTimer.Start();
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}
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else
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{
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IsDropDownOpen = false;
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}
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}
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private void OnFetchTimerTick(object sender, EventArgs e)
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{
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FetchTimer.IsEnabled = false;
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FetchTimer.Stop();
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if (Provider != null && ItemsSelector != null)
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{
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Filter = Editor.Text;
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if (_suggestionsAdapter == null)
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{
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_suggestionsAdapter = new SuggestionsAdapter(this);
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}
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_suggestionsAdapter.GetSuggestions(Filter);
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}
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}
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private void OnPopupClosed(object sender, EventArgs e)
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{
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if (!_selectionCancelled)
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{
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OnSelectionAdapterCommit(SelectionAdapter.EventCause.PopupClosed);
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}
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}
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private void OnPopupOpened(object sender, EventArgs e)
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{
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_selectionCancelled = false;
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ItemsSelector.SelectedItem = SelectedItem;
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}
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public event EventHandler<SelectionAdapter.PreSelectionAdapterFinishArgs> PreSelectionAdapterFinish;
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private bool PreSelectionEventSomeoneHandled(SelectionAdapter.EventCause cause, bool is_cancel) {
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if (PreSelectionAdapterFinish == null)
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return false;
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var args = new SelectionAdapter.PreSelectionAdapterFinishArgs { cause = cause, is_cancel = is_cancel };
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PreSelectionAdapterFinish?.Invoke(this, args);
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return args.handled;
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}
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private void OnSelectionAdapterCancel(SelectionAdapter.EventCause cause)
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{
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if (PreSelectionEventSomeoneHandled(cause, true))
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return;
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_isUpdatingText = true;
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Editor.Text = SelectedItem == null ? Filter : GetDisplayText(SelectedItem);
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Editor.SelectionStart = Editor.Text.Length;
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Editor.SelectionLength = 0;
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_isUpdatingText = false;
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IsDropDownOpen = false;
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_selectionCancelled = true;
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}
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private void OnSelectionAdapterCommit(SelectionAdapter.EventCause cause)
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{
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if (PreSelectionEventSomeoneHandled(cause, false))
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return;
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if (ItemsSelector.SelectedItem != null)
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{
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SelectedItem = ItemsSelector.SelectedItem;
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_isUpdatingText = true;
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Editor.Text = GetDisplayText(ItemsSelector.SelectedItem);
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SetSelectedItem(ItemsSelector.SelectedItem);
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_isUpdatingText = false;
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IsDropDownOpen = false;
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}
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}
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private void OnSelectionAdapterSelectionChanged()
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{
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_isUpdatingText = true;
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Editor.Text = ItemsSelector.SelectedItem == null ? Filter : GetDisplayText(ItemsSelector.SelectedItem);
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Editor.SelectionStart = Editor.Text.Length;
|
||||
Editor.SelectionLength = 0;
|
||||
ScrollToSelectedItem();
|
||||
_isUpdatingText = false;
|
||||
}
|
||||
|
||||
private void SetSelectedItem(object item)
|
||||
{
|
||||
_isUpdatingText = true;
|
||||
SelectedItem = item;
|
||||
_isUpdatingText = false;
|
||||
}
|
||||
#endregion
|
||||
|
||||
#region "Nested Types"
|
||||
|
||||
private class SuggestionsAdapter
|
||||
{
|
||||
|
||||
#region "Fields"
|
||||
|
||||
private readonly AutoCompleteComboBox _actb;
|
||||
|
||||
private string _filter;
|
||||
#endregion
|
||||
|
||||
#region "Constructors"
|
||||
|
||||
public SuggestionsAdapter(AutoCompleteComboBox actb)
|
||||
{
|
||||
_actb = actb;
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region "Methods"
|
||||
|
||||
public void GetSuggestions(string searchText)
|
||||
{
|
||||
_actb.IsLoading = true;
|
||||
// Do not open drop down if control is not focused
|
||||
if (_actb.IsKeyboardFocusWithin)
|
||||
_actb.IsDropDownOpen = true;
|
||||
_actb.ItemsSelector.ItemsSource = null;
|
||||
ParameterizedThreadStart thInfo = GetSuggestionsAsync;
|
||||
Thread th = new Thread(thInfo);
|
||||
_filter = searchText;
|
||||
th.Start(new object[] { searchText, _actb.Provider });
|
||||
}
|
||||
public void ShowFullCollection()
|
||||
{
|
||||
_filter = string.Empty;
|
||||
_actb.IsLoading = true;
|
||||
// Do not open drop down if control is not focused
|
||||
if (_actb.IsKeyboardFocusWithin)
|
||||
_actb.IsDropDownOpen = true;
|
||||
_actb.ItemsSelector.ItemsSource = null;
|
||||
ParameterizedThreadStart thInfo = GetFullCollectionAsync;
|
||||
Thread th = new Thread(thInfo);
|
||||
th.Start(_actb.Provider);
|
||||
}
|
||||
|
||||
private void DisplaySuggestions(IEnumerable suggestions, string filter)
|
||||
{
|
||||
if (_filter != filter)
|
||||
{
|
||||
return;
|
||||
}
|
||||
_actb.IsLoading = false;
|
||||
_actb.ItemsSelector.ItemsSource = suggestions;
|
||||
// Close drop down if there are no items
|
||||
if (_actb.IsDropDownOpen)
|
||||
{
|
||||
_actb.IsDropDownOpen = _actb.ItemsSelector.HasItems;
|
||||
}
|
||||
}
|
||||
|
||||
private void GetSuggestionsAsync(object param)
|
||||
{
|
||||
if (param is object[] args)
|
||||
{
|
||||
string searchText = Convert.ToString(args[0]);
|
||||
if (args[1] is IComboSuggestionProvider provider)
|
||||
{
|
||||
IEnumerable list = provider.GetSuggestions(searchText);
|
||||
_actb.Dispatcher.BeginInvoke(new Action<IEnumerable, string>(DisplaySuggestions), DispatcherPriority.Background, list, searchText);
|
||||
}
|
||||
}
|
||||
}
|
||||
private void GetFullCollectionAsync(object param)
|
||||
{
|
||||
if (param is IComboSuggestionProvider provider)
|
||||
{
|
||||
IEnumerable list = provider.GetFullCollection();
|
||||
_actb.Dispatcher.BeginInvoke(new Action<IEnumerable, string>(DisplaySuggestions), DispatcherPriority.Background, list, string.Empty);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user