CentralizedControl/HandyControl/HandyControl_Shared/Controls/Input/SearchBar.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using HandyControl.Data;
using HandyControl.Interactivity;

namespace HandyControl.Controls;

public class SearchBar : TextBox, ICommandSource
{
    public SearchBar()
    {
        CommandBindings.Add(new CommandBinding(ControlCommands.Search, (s, e) => OnSearchStarted()));
    }

    public static readonly RoutedEvent SearchStartedEvent =
        EventManager.RegisterRoutedEvent("SearchStarted", RoutingStrategy.Bubble,
            typeof(EventHandler<FunctionEventArgs<string>>), typeof(SearchBar));

    public event EventHandler<FunctionEventArgs<string>> SearchStarted
    {
        add => AddHandler(SearchStartedEvent, value);
        remove => RemoveHandler(SearchStartedEvent, value);
    }

    protected override void OnKeyDown(KeyEventArgs e)
    {
        base.OnKeyDown(e);

        if (e.Key == Key.Enter)
        {
            OnSearchStarted();
        }
    }

    protected override void OnTextChanged(TextChangedEventArgs e)
    {
        base.OnTextChanged(e);

        if (IsRealTime)
        {
            OnSearchStarted();
        }
    }

    private void OnSearchStarted()
    {
        RaiseEvent(new FunctionEventArgs<string>(SearchStartedEvent, this)
        {
            Info = Text
        });

        switch (Command)
        {
            case null:
                return;
            case RoutedCommand command:
                command.Execute(CommandParameter, CommandTarget);
                break;
            default:
                Command.Execute(CommandParameter);
                break;
        }
    }

    /// <summary>
    ///     是否实时搜索
    /// </summary>
    public static readonly DependencyProperty IsRealTimeProperty = DependencyProperty.Register(
        nameof(IsRealTime), typeof(bool), typeof(SearchBar), new PropertyMetadata(ValueBoxes.FalseBox));

    /// <summary>
    ///     是否实时搜索
    /// </summary>
    public bool IsRealTime
    {
        get => (bool) GetValue(IsRealTimeProperty);
        set => SetValue(IsRealTimeProperty, ValueBoxes.BooleanBox(value));
    }

    public static readonly DependencyProperty CommandProperty = DependencyProperty.Register(
        nameof(Command), typeof(ICommand), typeof(SearchBar), new PropertyMetadata(default(ICommand), OnCommandChanged));

    private static void OnCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var ctl = (SearchBar) d;
        if (e.OldValue is ICommand oldCommand)
        {
            oldCommand.CanExecuteChanged -= ctl.CanExecuteChanged;
        }
        if (e.NewValue is ICommand newCommand)
        {
            newCommand.CanExecuteChanged += ctl.CanExecuteChanged;
        }
    }

    public ICommand Command
    {
        get => (ICommand) GetValue(CommandProperty);
        set => SetValue(CommandProperty, value);
    }

    public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.Register(
        nameof(CommandParameter), typeof(object), typeof(SearchBar), new PropertyMetadata(default(object)));

    public object CommandParameter
    {
        get => GetValue(CommandParameterProperty);
        set => SetValue(CommandParameterProperty, value);
    }

    public static readonly DependencyProperty CommandTargetProperty = DependencyProperty.Register(
        nameof(CommandTarget), typeof(IInputElement), typeof(SearchBar), new PropertyMetadata(default(IInputElement)));

    public IInputElement CommandTarget
    {
        get => (IInputElement) GetValue(CommandTargetProperty);
        set => SetValue(CommandTargetProperty, value);
    }

    private void CanExecuteChanged(object sender, EventArgs e)
    {
        if (Command == null) return;

        IsEnabled = Command is RoutedCommand command
            ? command.CanExecute(CommandParameter, CommandTarget)
            : Command.CanExecute(CommandParameter);
    }
}