99 lines
3.4 KiB
C#
99 lines
3.4 KiB
C#
using System.ComponentModel;
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using FluidExplorer.ViewModels;
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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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namespace FluidExplorer.Views;
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/// <summary>一个标签页的宿主：负责单/双窗格布局与中间分隔条。</summary>
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public sealed partial class ExplorerTabView : UserControl
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{
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private bool _dragging;
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private double _startX;
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private double _startFirstWidth;
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private double _startSecondWidth;
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public ExplorerTabView()
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{
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InitializeComponent();
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Loaded += (_, _) => UpdatePaneLayout();
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}
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public static readonly DependencyProperty TabViewModelProperty = DependencyProperty.Register(
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nameof(TabViewModel),
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typeof(ExplorerTabViewModel),
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typeof(ExplorerTabView),
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new PropertyMetadata(null, OnTabChanged));
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public ExplorerTabViewModel? TabViewModel
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{
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get => (ExplorerTabViewModel?)GetValue(TabViewModelProperty);
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set => SetValue(TabViewModelProperty, value);
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}
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private static void OnTabChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var view = (ExplorerTabView)d;
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if (e.OldValue is ExplorerTabViewModel old) old.PropertyChanged -= view.OnTabPropertyChanged;
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if (e.NewValue is ExplorerTabViewModel tab) tab.PropertyChanged += view.OnTabPropertyChanged;
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view.UpdatePaneLayout();
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}
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private void OnTabPropertyChanged(object? sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == nameof(ExplorerTabViewModel.IsDualPane)) UpdatePaneLayout();
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}
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private void UpdatePaneLayout()
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{
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var dual = TabViewModel?.IsDualPane == true;
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if (dual)
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{
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Splitter.Visibility = Visibility.Visible;
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SecondaryPaneView.Visibility = Visibility.Visible;
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SplitterColumn.Width = new GridLength(4);
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if (FirstColumn.Width.IsAbsolute && SecondColumn.Width.IsAbsolute) return;
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FirstColumn.Width = new GridLength(1, GridUnitType.Star);
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SecondColumn.Width = new GridLength(1, GridUnitType.Star);
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}
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else
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{
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Splitter.Visibility = Visibility.Collapsed;
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SecondaryPaneView.Visibility = Visibility.Collapsed;
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SplitterColumn.Width = new GridLength(0);
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FirstColumn.Width = new GridLength(1, GridUnitType.Star);
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SecondColumn.Width = new GridLength(0);
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}
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}
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private void OnSplitterPointerPressed(object sender, PointerRoutedEventArgs e)
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{
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_dragging = true;
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_startX = e.GetCurrentPoint(LayoutRoot).Position.X;
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_startFirstWidth = FirstColumn.ActualWidth;
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_startSecondWidth = SecondColumn.ActualWidth;
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Splitter.CapturePointer(e.Pointer);
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}
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private void OnSplitterPointerMoved(object sender, PointerRoutedEventArgs e)
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{
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if (!_dragging) return;
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var delta = e.GetCurrentPoint(LayoutRoot).Position.X - _startX;
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var total = _startFirstWidth + _startSecondWidth;
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const double min = 240;
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var first = Math.Clamp(_startFirstWidth + delta, min, total - min);
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FirstColumn.Width = new GridLength(first, GridUnitType.Pixel);
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SecondColumn.Width = new GridLength(total - first, GridUnitType.Pixel);
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}
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private void OnSplitterPointerReleased(object sender, PointerRoutedEventArgs e)
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{
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if (!_dragging) return;
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_dragging = false;
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Splitter.ReleasePointerCapture(e.Pointer);
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}
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}
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