C4IT-F4SD-Client/FasdDesktopUi/Basics/UserControls/SearchBar.xaml.cs

using System;
using System.Timers;
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 SearchBar : UserControl
    {
        private readonly Timer _searchTimer = new Timer();

        #region Dependency Properties

        public static readonly DependencyProperty SearchButtonSizeProperty =
            DependencyProperty.Register(nameof(SearchButtonSize), typeof(double), typeof(SearchBar), new PropertyMetadata(30.0));

        public double SearchButtonSize
        {
            get => (double)GetValue(SearchButtonSizeProperty);
            set => SetValue(SearchButtonSizeProperty, value);
        }

        public static readonly DependencyProperty CloseButtonSizeProperty =
            DependencyProperty.Register(nameof(CloseButtonSize), typeof(double), typeof(SearchBar), new PropertyMetadata(30.0));

        public double CloseButtonSize
        {
            get => (double)GetValue(CloseButtonSizeProperty);
            set => SetValue(CloseButtonSizeProperty, value);
        }

        public static readonly DependencyProperty ShowCloseButtonProperty =
            DependencyProperty.Register(nameof(ShowCloseButton), typeof(bool), typeof(SearchBar), new PropertyMetadata(true));

        public bool ShowCloseButton
        {
            get => (bool)GetValue(ShowCloseButtonProperty);
            set => SetValue(ShowCloseButtonProperty, value);
        }

        public static readonly DependencyProperty ShowSearchButtonProperty =
            DependencyProperty.Register(nameof(ShowSearchButton), typeof(bool), typeof(SearchBar), new PropertyMetadata(true));

        public bool ShowSearchButton
        {
            get => (bool)GetValue(ShowSearchButtonProperty);
            set => SetValue(ShowSearchButtonProperty, value);
        }

        public static readonly DependencyProperty PlaceholderTextProperty =
            DependencyProperty.Register(nameof(PlaceholderText), typeof(string), typeof(SearchBar), new PropertyMetadata(string.Empty));

        public string PlaceholderText
        {
            get => (string)GetValue(PlaceholderTextProperty);
            set => SetValue(PlaceholderTextProperty, value);
        }

        public static readonly DependencyProperty DebounceIntervalProperty =
            DependencyProperty.Register(nameof(DebounceInterval), typeof(TimeSpan), typeof(SearchBar),
                new PropertyMetadata(TimeSpan.FromMilliseconds(250), OnDebounceIntervalChanged));

        public TimeSpan DebounceInterval
        {
            get => (TimeSpan)GetValue(DebounceIntervalProperty);
            set => SetValue(DebounceIntervalProperty, value);
        }

        private static void OnDebounceIntervalChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            TimeSpan interval = (TimeSpan)e.NewValue;
            ((SearchBar)d)._searchTimer.Interval = Math.Max(interval.TotalMilliseconds, 10);
        }

        public static readonly DependencyProperty IsInputEnabledProperty =
            DependencyProperty.Register(nameof(IsInputEnabled), typeof(bool), typeof(SearchBar), new PropertyMetadata(true));

        public bool IsInputEnabled
        {
            get => (bool)GetValue(IsInputEnabledProperty);
            set => SetValue(IsInputEnabledProperty, value);
        }

        public SolidColorBrush SearchBackground
        {
            get { return (SolidColorBrush)GetValue(SearchBackgroundProperty); }
            set { SetValue(SearchBackgroundProperty, value); }
        }

        public static readonly DependencyProperty SearchBackgroundProperty =
            DependencyProperty.Register(nameof(SearchBackground), typeof(SolidColorBrush), typeof(SearchBar), new PropertyMetadata(null));

        #endregion

        #region SearchValue

        private string _searchValue = null;
        public string SearchValue
        {
            get => _searchValue;
            set
            {
                if (value != _searchValue)
                {
                    _searchValue = value;
                    if (IsInputEnabled)
                        HandleSearchValueChanged();
                }
            }
        }

        #endregion

        #region Events

        public event EventHandler<string> SearchValueChanged;

        public static readonly RoutedEvent CancelledSearchEvent =
            EventManager.RegisterRoutedEvent(nameof(CancelledSearch), RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(SearchBar));

        public event RoutedEventHandler CancelledSearch
        {
            add => AddHandler(CancelledSearchEvent, value);
            remove => RemoveHandler(CancelledSearchEvent, value);
        }

        #endregion

        public SearchBar()
        {
            InitializeComponent();
        }

        public void Clear()
        {
            SearchTextBox.Text = null;
        }

        public void SetSearchText(string search)
        {
            SearchTextBox.Text = search;
            SearchTextBox.CaretIndex = search?.Length ?? 0;
            SearchTextBox.Focus();
            Keyboard.Focus(SearchTextBox);
        }

        public void FocusInput()
        {
            SearchTextBox.Focus();
            Keyboard.Focus(SearchTextBox);
        }

        internal void SetSpinnerVisibility(Visibility visibility)
        {
            Dispatcher.Invoke(() => SearchSpinner.Visibility = visibility);
        }

        private void HandleSearchValueChanged()
        {
            if (_searchTimer.Enabled)
                _searchTimer.Stop();

            _searchTimer.Start();
        }

        private void SearchTimerTick(object sender, EventArgs e)
        {
            _searchTimer.Stop();
            SearchValueChanged?.Invoke(this, SearchValue);
        }

        private void SearchButton_Click(object sender, InputEventArgs e)
        {
            SearchTextBox.Focus();
        }

        private void CloseButton_Click(object sender, InputEventArgs e)
        {
            RaiseEvent(new RoutedEventArgs(CancelledSearchEvent));
        }

        private void SearchBar_Loaded(object sender, RoutedEventArgs e)
        {
            _searchTimer.Stop();
            _searchTimer.Interval = Math.Max(DebounceInterval.TotalMilliseconds, 10);
            _searchTimer.Elapsed += SearchTimerTick;
            BackgroundBorder.CornerRadius = new CornerRadius(BackgroundBorder.ActualHeight / 2.0);
        }

        internal void ActivateManualSearch()
        {
            Search.Clear();
            Search.IsInputEnabled = true;

            Dispatcher.BeginInvoke(new Action(() =>
            {
                Search.FocusInput();
            }), DispatcherPriority.Input);
        }
    }
}