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feat(dock): implement drop highlight calculations

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Misaki
2026-03-28 14:18:02 +09:00
parent dee33958b9
commit 8d789af888
1 changed files with 88 additions and 0 deletions
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88
src/Editor/Ghost.Editor/View/Controls/DockLayout.cs
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@@ -286,9 +286,97 @@ public sealed partial class DockLayout : Control
Mode = BindingMode.TwoWay
});
tabView.DragOver += TabView_DragOver;
tabView.DragLeave += TabView_DragLeave;
tabView.Drop += TabView_Drop;
tabView.TabDragStarting += TabView_TabDragStarting;
return tabView;
}
private object? _draggedItem;
private DockPanelNode? _sourceNode;
private DockPosition _currentDropPosition = DockPosition.None;
private void TabView_TabDragStarting(Microsoft.UI.Xaml.Controls.TabView sender, Microsoft.UI.Xaml.Controls.TabViewTabDragStartingEventArgs args)
{
_draggedItem = args.Item;
_sourceNode = sender.Tag as DockPanelNode;
args.Data.Properties.Add("DockTab", _draggedItem); // Identify our drag
}
private void TabView_DragOver(object sender, DragEventArgs e)
{
if (e.DataView.Properties.ContainsKey("DockTab") && sender is FrameworkElement targetElement)
{
e.AcceptedOperation = global::Windows.ApplicationModel.DataTransfer.DataPackageOperation.Move;
var position = e.GetPosition(targetElement);
double width = targetElement.ActualWidth;
double height = targetElement.ActualHeight;
double edgeThreshold = 0.25; // 25% of edge triggers split
if (position.X < width * edgeThreshold) _currentDropPosition = DockPosition.Left;
else if (position.X > width * (1 - edgeThreshold)) _currentDropPosition = DockPosition.Right;
else if (position.Y < height * edgeThreshold) _currentDropPosition = DockPosition.Top;
else if (position.Y > height * (1 - edgeThreshold)) _currentDropPosition = DockPosition.Bottom;
else _currentDropPosition = DockPosition.Center;
UpdateDropOverlay(targetElement, _currentDropPosition);
}
}
private void TabView_DragLeave(object sender, DragEventArgs e)
{
if (_dropTargetOverlay != null)
{
_dropTargetOverlay.Visibility = Visibility.Collapsed;
_currentDropPosition = DockPosition.None;
}
}
private void UpdateDropOverlay(FrameworkElement targetElement, DockPosition position)
{
if (_dropTargetOverlay == null) return;
if (position == DockPosition.None)
{
_dropTargetOverlay.Visibility = Visibility.Collapsed;
return;
}
var transform = targetElement.TransformToVisual(this);
var bounds = transform.TransformBounds(new global::Windows.Foundation.Rect(0, 0, targetElement.ActualWidth, targetElement.ActualHeight));
_dropTargetOverlay.Visibility = Visibility.Visible;
_dropTargetOverlay.Width = double.NaN;
_dropTargetOverlay.Height = double.NaN;
switch (position)
{
case DockPosition.Center:
_dropTargetOverlay.Margin = new Thickness(bounds.Left, bounds.Top, ActualWidth - bounds.Right, ActualHeight - bounds.Bottom);
break;
case DockPosition.Left:
_dropTargetOverlay.Margin = new Thickness(bounds.Left, bounds.Top, ActualWidth - (bounds.Left + bounds.Width / 2), ActualHeight - bounds.Bottom);
break;
case DockPosition.Right:
_dropTargetOverlay.Margin = new Thickness(bounds.Left + bounds.Width / 2, bounds.Top, ActualWidth - bounds.Right, ActualHeight - bounds.Bottom);
break;
case DockPosition.Top:
_dropTargetOverlay.Margin = new Thickness(bounds.Left, bounds.Top, ActualWidth - bounds.Right, ActualHeight - (bounds.Top + bounds.Height / 2));
break;
case DockPosition.Bottom:
_dropTargetOverlay.Margin = new Thickness(bounds.Left, bounds.Top + bounds.Height / 2, ActualWidth - bounds.Right, ActualHeight - bounds.Bottom);
break;
}
}
// Add a dummy TabView_Drop method so it compiles, we will implement it in Task 6
private void TabView_Drop(object sender, DragEventArgs e)
{
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();