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新增 PopupPositionerExtensions
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src/AtomUI.Controls/Popup/PopupPositionerExtensions.cs
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113
src/AtomUI.Controls/Popup/PopupPositionerExtensions.cs
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using AtomUI.Reflection;
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using Avalonia;
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using Avalonia.Controls;
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using Avalonia.Controls.Primitives;
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using Avalonia.Controls.Primitives.PopupPositioning;
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using Avalonia.Media;
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using Avalonia.VisualTree;
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namespace AtomUI.Controls;
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static class PopupPositionerExtensions
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{
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public static void ConfigurePosition(ref this PopupPositionerParameters positionerParameters,
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TopLevel topLevel,
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Visual target, PlacementMode placement, Point offset,
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PopupAnchor anchor, PopupGravity gravity,
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PopupPositionerConstraintAdjustment constraintAdjustment, Rect? rect,
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FlowDirection flowDirection)
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{
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positionerParameters.Offset = offset;
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positionerParameters.ConstraintAdjustment = constraintAdjustment;
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if (placement == PlacementMode.Pointer) {
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// We need a better way for tracking the last pointer position
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topLevel.TryGetProperty<PixelPoint?>("LastPointerPosition", out var lastPointerPosition);
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var position = topLevel.PointToClient(lastPointerPosition ?? default);
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positionerParameters.AnchorRectangle = new Rect(position, new Size(1, 1));
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positionerParameters.Anchor = PopupAnchor.TopLeft;
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positionerParameters.Gravity = PopupGravity.BottomRight;
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} else {
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if (target == null) {
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throw new InvalidOperationException("Placement mode is not Pointer and PlacementTarget is null");
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}
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Matrix? matrix;
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if (TryGetAdorner(target, out var adorned, out var adornerLayer)) {
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matrix = adorned!.TransformToVisual(topLevel) * target.TransformToVisual(adornerLayer!);
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} else {
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matrix = target.TransformToVisual(topLevel);
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}
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if (matrix == null) {
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if (target.GetVisualRoot() == null) {
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throw new InvalidOperationException("Target control is not attached to the visual tree");
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}
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throw new InvalidOperationException("Target control is not in the same tree as the popup parent");
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}
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var bounds = new Rect(default, target.Bounds.Size);
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var anchorRect = rect ?? bounds;
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positionerParameters.AnchorRectangle = anchorRect.Intersect(bounds).TransformToAABB(matrix.Value);
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var parameters = placement switch
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{
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PlacementMode.Bottom => (PopupAnchor.Bottom, PopupGravity.Bottom),
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PlacementMode.Right => (PopupAnchor.Right, PopupGravity.Right),
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PlacementMode.Left => (PopupAnchor.Left, PopupGravity.Left),
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PlacementMode.Top => (PopupAnchor.Top, PopupGravity.Top),
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PlacementMode.Center => (PopupAnchor.None, PopupGravity.None),
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PlacementMode.AnchorAndGravity => (anchor, gravity),
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PlacementMode.TopEdgeAlignedRight => (PopupAnchor.TopRight, PopupGravity.TopLeft),
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PlacementMode.TopEdgeAlignedLeft => (PopupAnchor.TopLeft, PopupGravity.TopRight),
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PlacementMode.BottomEdgeAlignedLeft => (PopupAnchor.BottomLeft, PopupGravity.BottomRight),
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PlacementMode.BottomEdgeAlignedRight => (PopupAnchor.BottomRight, PopupGravity.BottomLeft),
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PlacementMode.LeftEdgeAlignedTop => (PopupAnchor.TopLeft, PopupGravity.BottomLeft),
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PlacementMode.LeftEdgeAlignedBottom => (PopupAnchor.BottomLeft, PopupGravity.TopLeft),
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PlacementMode.RightEdgeAlignedTop => (PopupAnchor.TopRight, PopupGravity.BottomRight),
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PlacementMode.RightEdgeAlignedBottom => (PopupAnchor.BottomRight, PopupGravity.TopRight),
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_ => throw new ArgumentOutOfRangeException(nameof(placement), placement,
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"Invalid value for Popup.PlacementMode")
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};
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positionerParameters.Anchor = parameters.Item1;
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positionerParameters.Gravity = parameters.Item2;
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}
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// Invert coordinate system if FlowDirection is RTL
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if (flowDirection == FlowDirection.RightToLeft) {
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if ((positionerParameters.Anchor & PopupAnchor.Right) == PopupAnchor.Right) {
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positionerParameters.Anchor ^= PopupAnchor.Right;
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positionerParameters.Anchor |= PopupAnchor.Left;
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} else if ((positionerParameters.Anchor & PopupAnchor.Left) == PopupAnchor.Left) {
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positionerParameters.Anchor ^= PopupAnchor.Left;
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positionerParameters.Anchor |= PopupAnchor.Right;
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}
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if ((positionerParameters.Gravity & PopupGravity.Right) == PopupGravity.Right) {
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positionerParameters.Gravity ^= PopupGravity.Right;
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positionerParameters.Gravity |= PopupGravity.Left;
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} else if ((positionerParameters.Gravity & PopupGravity.Left) == PopupGravity.Left) {
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positionerParameters.Gravity ^= PopupGravity.Left;
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positionerParameters.Gravity |= PopupGravity.Right;
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}
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}
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}
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private static bool TryGetAdorner(Visual target, out Visual? adorned, out Visual? adornerLayer)
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{
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var element = target;
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while (element != null) {
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if (AdornerLayer.GetAdornedElement(element) is { } adornedElement) {
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adorned = adornedElement;
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adornerLayer = AdornerLayer.GetAdornerLayer(adorned);
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return true;
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}
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element = element.GetVisualParent();
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}
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adorned = null;
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adornerLayer = null;
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return false;
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}
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}
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