Misaki/GhostEngine
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feat(editor): implement scroll state saving for ProjectBrowser ItemsView

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Misaki
2026-03-29 14:54:26 +09:00
parent 257838b33e
commit 70b7e56eb7
1 changed files with 53 additions and 0 deletions
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53
src/Editor/Ghost.Editor/View/Controls/ProjectBrowser.xaml.cs
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@@ -17,6 +17,9 @@ internal sealed partial class ProjectBrowser : UserControl
private readonly IInspectorService _inspectorService;
private bool _isUpdatingSelection = false;
private double _savedHorizontalOffset;
private double _savedVerticalOffset;
private ScrollViewer? _filesScrollViewer;
public ProjectBrowserViewModel ViewModel
{
@@ -50,12 +53,42 @@ internal sealed partial class ProjectBrowser : UserControl
{
_inspectorService.OnSelectionChanged += _inspectorService_OnSelectionChanged;
PART_FilesView.UpdateLayout();
DispatcherQueue.TryEnqueue(Microsoft.UI.Dispatching.DispatcherQueuePriority.Low, () =>
{
if (_filesScrollViewer == null)
{
_filesScrollViewer = FindVisualChild<ScrollViewer>(PART_FilesView);
}
if (_filesScrollViewer != null)
{
// Sometimes resetting the ItemsSource helps clear corrupted virtualization state
var itemsSource = PART_FilesView.ItemsSource;
PART_FilesView.ItemsSource = null;
PART_FilesView.ItemsSource = itemsSource;
PART_FilesView.UpdateLayout();
_filesScrollViewer.ChangeView(_savedHorizontalOffset, _savedVerticalOffset, null, true);
}
});
}
private void ProjectBrowser_Unloaded(object sender, RoutedEventArgs e)
{
_inspectorService.OnSelectionChanged -= _inspectorService_OnSelectionChanged;
if (_filesScrollViewer == null)
{
_filesScrollViewer = FindVisualChild<ScrollViewer>(PART_FilesView);
}
if (_filesScrollViewer != null)
{
_savedHorizontalOffset = _filesScrollViewer.HorizontalOffset;
_savedVerticalOffset = _filesScrollViewer.VerticalOffset;
}
if (LastFocused == this)
{
LastFocused = null;
@@ -71,6 +104,26 @@ internal sealed partial class ProjectBrowser : UserControl
}
}
private static T? FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
{
for (int i = 0; i < Microsoft.UI.Xaml.Media.VisualTreeHelper.GetChildrenCount(parent); i++)
{
var child = Microsoft.UI.Xaml.Media.VisualTreeHelper.GetChild(parent, i);
if (child is T t)
{
return t;
}
var result = FindVisualChild<T>(child);
if (result != null)
{
return result;
}
}
return null;
}
private void PART_DirectoriesView_SelectionChanged(TreeView sender, TreeViewSelectionChangedEventArgs args)
{
if (_isUpdatingSelection)