mirror of
https://github.com/LanZhan-Harmony/WindowsMusicPlayer-TheUntamedMusicPlayer.git
synced 2026-05-07 03:25:48 +08:00
317 lines
9.8 KiB
C#
317 lines
9.8 KiB
C#
using System.ComponentModel;
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using Microsoft.UI.Dispatching;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Input;
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using UntamedMusicPlayer.Controls;
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using UntamedMusicPlayer.Models;
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using UntamedMusicPlayer.Playback;
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using UntamedMusicPlayer.ViewModels;
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using Windows.Foundation;
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namespace UntamedMusicPlayer.Views;
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public sealed partial class LyricPage : Page, IDisposable
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{
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public LyricViewModel ViewModel { get; }
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private readonly Timer _autoScrollDelayTimer;
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private bool _isManualScrolling;
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private bool _isProgrammaticScroll;
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private readonly Timer _titleBarTimer;
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private bool _titleBarTimerEnabled = false;
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private bool _isTitleBarHidden = false;
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public LyricPage()
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{
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ViewModel = App.GetService<LyricViewModel>();
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InitializeComponent();
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Data.PlayState.PropertyChanged += OnStateChanged;
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_autoScrollDelayTimer = new Timer(
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_ => DispatcherQueue.TryEnqueue(DispatcherQueuePriority.Low, ScrollToCurrentLyric),
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null,
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Timeout.Infinite,
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Timeout.Infinite
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);
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_titleBarTimer = new Timer(TimerTick, null, Timeout.Infinite, Timeout.Infinite);
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Data.RootPlayBarViewModel?.PropertyChanged += RootPlayBarViewModelPropertyChanged;
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}
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private void RootPlayBarViewModelPropertyChanged(object? sender, PropertyChangedEventArgs e)
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{
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if (
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e.PropertyName
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is nameof(RootPlayBarViewModel.IsDetail)
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or nameof(RootPlayBarViewModel.IsFullScreen)
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)
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{
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if (Data.RootPlayBarViewModel!.IsDetail && Data.RootPlayBarViewModel.IsFullScreen)
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{
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RootGrid.PointerMoved += RootGrid_PointerMoved;
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}
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else
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{
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RootGrid.PointerMoved -= RootGrid_PointerMoved;
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if (_isTitleBarHidden)
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{
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ContentGrid.Margin = new Thickness(0);
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ShowTitleBarStoryboard.Begin();
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_isTitleBarHidden = false;
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StopTitleBarTimer();
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}
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}
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}
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}
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private void RootGrid_PointerMoved(object sender, PointerRoutedEventArgs e)
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{
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var pointerPoint = e.GetCurrentPoint(RootGrid);
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var position = pointerPoint.Position;
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if (position.Y < 33) // 如果鼠标在顶部 33 像素范围内
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{
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if (_isTitleBarHidden)
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{
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ContentGrid.Margin = new Thickness(0);
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ShowTitleBarStoryboard.Begin();
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_isTitleBarHidden = false;
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}
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StopTitleBarTimer();
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}
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else if (!_isTitleBarHidden) // 鼠标离开了底部，开始定时器
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{
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StartTitleBarTimer();
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}
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}
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private void TimerTick(object? state)
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{
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StopTitleBarTimer();
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DispatcherQueue.TryEnqueue(
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DispatcherQueuePriority.Low,
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() =>
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{
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if (
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Data.RootPlayBarViewModel!.IsDetail
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&& Data.RootPlayBarViewModel.IsFullScreen
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&& !_isTitleBarHidden
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)
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{
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ContentGrid.Margin = new Thickness(0, -33, 0, 0);
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HideTitleBarStoryboard.Begin();
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_isTitleBarHidden = true;
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}
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}
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);
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}
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private void StartTitleBarTimer()
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{
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if (!_titleBarTimerEnabled)
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{
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_titleBarTimer.Change(TimeSpan.FromSeconds(2), Timeout.InfiniteTimeSpan);
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_titleBarTimerEnabled = true;
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}
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}
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private void StopTitleBarTimer()
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{
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if (_titleBarTimerEnabled)
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{
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_titleBarTimer.Change(Timeout.Infinite, Timeout.Infinite);
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_titleBarTimerEnabled = false;
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}
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}
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private void CoverBtnClickToDetail(object sender, RoutedEventArgs e)
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{
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Data.RootPlayBarViewModel!.DetailModeUpdate();
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}
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private void AddToSubItem_Loaded(object sender, RoutedEventArgs e)
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{
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if (sender is MenuFlyoutSubItem menuItem)
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{
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while (menuItem.Items.Count > 3)
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{
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menuItem.Items.RemoveAt(3);
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}
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foreach (var playlist in Data.PlaylistLibrary.Playlists)
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{
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var playlistMenuItem = new MenuFlyoutItem
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{
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Text = playlist.Name,
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DataContext = playlist,
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};
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playlistMenuItem.Click += PlaylistMenuItem_Click;
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menuItem.Items.Add(playlistMenuItem);
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}
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}
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}
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private void PlaylistMenuItem_Click(object sender, RoutedEventArgs e)
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{
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if (sender is MenuFlyoutItem { DataContext: PlaylistInfo playlist })
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{
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ViewModel.AddToPlaylistButton_Click(playlist);
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}
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}
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private async void AddToNewPlaylistButton_Click(object sender, RoutedEventArgs e)
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{
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var dialog = new NewPlaylistInfoDialog() { XamlRoot = XamlRoot };
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var result = await dialog.ShowAsync();
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if (result == ContentDialogResult.Primary && dialog.CreatedPlaylist is not null)
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{
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ViewModel.AddToPlaylistButton_Click(dialog.CreatedPlaylist);
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}
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}
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private async void PropertiesButton_Click(object sender, RoutedEventArgs e)
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{
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var currentSong = Data.PlayState.CurrentSong;
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var dialog = new PropertiesDialog(currentSong!) { XamlRoot = XamlRoot };
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await dialog.ShowAsync();
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}
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private void OnStateChanged(object? sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == nameof(SharedPlaybackState.CurrentSong))
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{
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if (ReferenceGrid.ActualWidth > 0 && ReferenceGrid.ActualHeight > 0)
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{
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ChangeCoverSize(ReferenceGrid.ActualWidth, ReferenceGrid.ActualHeight);
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}
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}
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}
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private void ReferenceGrid_SizeChanged(object sender, SizeChangedEventArgs e)
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{
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ChangeCoverSize(e.NewSize.Width, e.NewSize.Height);
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}
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private void ChangeCoverSize(double width, double height)
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{
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if (width <= 0 || height <= 0)
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{
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return;
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}
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// 计算可用空间
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var baseNum = Math.Min(width, height);
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var scalingMargin = baseNum < 300 ? 50 : baseNum * 0.4;
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var availableWidth = Math.Max(0, width - scalingMargin);
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var availableHeight = Math.Max(0, height - scalingMargin);
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var currentCover = Data.PlayState.CurrentSong?.Cover;
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double coverWidth,
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coverHeight;
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if (currentCover?.PixelWidth > 0 && currentCover?.PixelHeight > 0)
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{
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var aspectRatio = (double)currentCover.PixelWidth / currentCover.PixelHeight;
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var widthBasedHeight = availableWidth / aspectRatio;
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var heightBasedWidth = availableHeight * aspectRatio;
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(coverWidth, coverHeight) =
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widthBasedHeight <= availableHeight
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? (availableWidth, widthBasedHeight)
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: (heightBasedWidth, availableHeight);
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}
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else // 默认正方形
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{
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coverWidth = coverHeight = Math.Min(availableWidth, availableHeight);
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}
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CoverBorder.Width = coverWidth;
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CoverBorder.Height = coverHeight;
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}
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private void TextBlock_SizeChanged(object sender, SizeChangedEventArgs e)
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{
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if (_isManualScrolling)
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{
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return;
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}
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var textblock = (sender as TextBlock)!;
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if (Math.Abs(textblock.FontSize - Settings.LyricPageCurrentFontSize) < 1e-3)
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{
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var currentScrollPosition = LyricViewer.VerticalOffset;
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var point = new Point(0, currentScrollPosition);
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// 计算出目标位置并滚动
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var targetPosition = textblock.TransformToVisual(LyricViewer).TransformPoint(point);
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_isProgrammaticScroll = true;
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LyricViewer.ChangeView(
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null,
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targetPosition.Y - LyricViewer.ActualHeight / 2 + 40,
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null,
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false
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);
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}
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}
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private void LyricViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
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{
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if (_isProgrammaticScroll) // 如果是自动滚动
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{
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if (!e.IsIntermediate) // 自动滚动完成后重置标志
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{
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_isProgrammaticScroll = false;
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}
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return;
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}
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_isManualScrolling = true;
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_autoScrollDelayTimer.Change(Timeout.Infinite, Timeout.Infinite);
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if (!e.IsIntermediate) // 用户停止滚动，启动5秒倒计时
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{
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_autoScrollDelayTimer.Change(5000, Timeout.Infinite);
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}
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}
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private void ScrollToCurrentLyric()
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{
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_isManualScrolling = false;
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var currentSlice = Data.LyricManager.CurrentLyricSlices.FirstOrDefault(s => s.IsCurrent);
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if (
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currentSlice is null
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|| LyricView.ContainerFromItem(currentSlice) is not UIElement container
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)
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{
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return;
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}
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var currentScrollPosition = LyricViewer.VerticalOffset;
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var point = new Point(0, currentScrollPosition);
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// 获取容器相对于 ScrollViewer 的位置
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// 容器位置 + 歌词顶部的 Margin (40) 约等于 TextBlock 的位置
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var targetPosition = container.TransformToVisual(LyricViewer).TransformPoint(point);
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_isProgrammaticScroll = true;
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LyricViewer.ChangeView(
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null,
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targetPosition.Y - LyricViewer.ActualHeight / 2 + 80, // 40 (Margin) + 40 (Offset)
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null,
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false
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);
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}
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public void Dispose()
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{
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_autoScrollDelayTimer.Dispose();
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Data.PlayState.PropertyChanged -= OnStateChanged;
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Data.LyricPage = null;
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}
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}
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