using PDF_Master.Helper;
using PDF_Master.Views.HomePanel.RecentFiles;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace PDF_Master.Views.HomePanel
{
    /// <summary>
    /// HomeGuidContent.xaml 的交互逻辑
    /// </summary>
    public partial class HomeGuidContent : UserControl
    {
        public HomeGuidContent()
        {
            InitializeComponent();
        }

        private void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
            e.Handled = true;
            var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
            {
                RoutedEvent = UIElement.MouseWheelEvent,
                Source = sender
            };
            var listView = FindChild<ListView>(sender as DependencyObject);
            listView.RaiseEvent(eventArg);
        }

        private static T FindChild<T>(DependencyObject parent) where T : DependencyObject
        {
            if (parent == null) return null;

            var foundChild = default(T);
            var childCount = VisualTreeHelper.GetChildrenCount(parent);
            for (var i = 0; i < childCount; i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                if (child is T t)
                {
                    foundChild = t;
                    break;
                }
                foundChild = FindChild<T>(child);
                if (foundChild != null) break;
            }
            return foundChild;
        }

        private void Recentlist_MouseDown(object sender, MouseButtonEventArgs e)
        {
            //Windows:最近文件列表补充点击空白处取消选中；移除Esc取消选中逻辑
            // 文件列表，需要点击其他空白区域取消文件选中
            if (e.ClickCount == 1 && e.LeftButton == MouseButtonState.Pressed && Recentlist.GridRecentFilesList.Visibility == Visibility.Visible && Recentlist.GridRecentFilesList.SelectedItems.Count > 0)
            {
                HitTestResult hitTestResult = VisualTreeHelper.HitTest(Recentlist.GridRecentFilesList, e.GetPosition(Recentlist.GridRecentFilesList));
                if (hitTestResult == null)
                {
                    Recentlist.GridRecentFilesList.SelectedItems.Clear();
                }
                else if (hitTestResult.VisualHit == Recentlist.GridRecentFilesList)
                {
                    Recentlist.GridRecentFilesList.SelectedItems.Clear();
                }
                else if (hitTestResult.VisualHit is ScrollViewer scrollViewer)
                {
                    Recentlist.GridRecentFilesList.SelectedItems.Clear();
                }
            }
            else if (e.ClickCount == 1 && e.LeftButton == MouseButtonState.Pressed && Recentlist.RecentFilesList.Visibility == Visibility.Visible && Recentlist.RecentFilesList.SelectedItems.Count > 0)
            {
                HitTestResult hitTestResult = VisualTreeHelper.HitTest(Recentlist.RecentFilesList, e.GetPosition(Recentlist.RecentFilesList));
                if (hitTestResult == null)
                {
                    Recentlist.RecentFilesList.SelectedItems.Clear();
                }
                else if (hitTestResult.VisualHit == Recentlist.RecentFilesList)
                {
                    Recentlist.RecentFilesList.SelectedItems.Clear();
                }
                else if (hitTestResult.VisualHit is ScrollViewer scrollViewer)
                {
                    Recentlist.RecentFilesList.SelectedItems.Clear();
                }
            }
        }

        private void UserControl_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Recentlist_MouseDown(sender, e);
        }
    }
}