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fix/tree-dropdown-animations

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This commit is contained in:
xrEugene
2026-08-06 20:31:20 +03:00
parent c8f04c472b
commit 67aaa3af5f
1 changed files with 17 additions and 5 deletions
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Source/Editor/GUI/Tree/TreeNode.cs
+17 -5
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@@ -508,9 +508,9 @@ namespace FlaxEditor.GUI.Tree
/// <returns>True if event has been handled.</returns>
protected virtual bool OnMouseDoubleClickHeader(ref Float2 location, MouseButton button)
{
if (HasAnyVisibleChild)
if (HasAnyVisibleChild && _animationProgress >= 1.0f)
{
// Toggle open state
// Toggle open state (ignored while an expand/collapse animation is running)
if (_opened)
Collapse();
else
@@ -966,8 +966,8 @@ namespace FlaxEditor.GUI.Tree
}
}
// Check if mouse hits arrow
if (_mouseOverArrow && HasAnyVisibleChild)
// Check if mouse hits arrow (ignored while an expand/collapse animation is running)
if (_mouseOverArrow && HasAnyVisibleChild && _animationProgress >= 1.0f)
{
if (ParentTree.Root.GetKey(KeyboardKeys.Alt))
{
@@ -1322,7 +1322,19 @@ namespace FlaxEditor.GUI.Tree
// Skip full layout if it's fully collapsed
if (_opened || _animationProgress < 1.0f)
{
y -= _cachedHeight * (_opened ? 1.0f - _animationProgress : _animationProgress);
// Measure the total children height this frame instead of relying on the previously cached one.
// Using the stale _cachedHeight causes a visible 3-frame flicker on first expand (down -> up -> down).
// Frame 1 uses the collapsed cache (~header height) so children snap to fully-open.
// Frame 2 uses the just-refreshed full height so they snap behind the header.
// At the end subsequent frames slide back down.
float childrenHeight = 0.0f;
for (int i = 0; i < _children.Count; i++)
{
if (_children[i] is TreeNode node && node.Visible)
childrenHeight += node.Height + DefaultNodeOffsetY;
}
y -= childrenHeight * (_opened ? 1.0f - _animationProgress : _animationProgress);
for (int i = 0; i < _children.Count; i++)
{
if (_children[i] is TreeNode node && node.Visible)