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fixed a rare stack overflow where scroll bars could get stuck in an auto-hide loop

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This commit is contained in:
Ell 2021-03-29 08:28:49 +02:00
parent b1ff703fe1
commit 82b8c0ab49
3 changed files with 19 additions and 13 deletions
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24
MLEM.Ui/Elements/Element.cs
View file

@ -626,26 +626,30 @@ namespace MLEM.Ui.Elements {
if (this.Children.Count > 0) {
Element foundChild = null;
var autoSize = this.Area.Size;
var autoSize = this.UnscrolledArea.Size;
if (this.SetHeightBasedOnChildren) {
var lowest = this.GetLowestChild(e => !e.IsHidden);
var newY = lowest?.UnscrolledArea.Bottom - pos.Y + this.ScaledChildPadding.Bottom;
if (newY != null && autoSize.Y != newY) {
autoSize.Y = newY.Value;
foundChild = lowest;
if (lowest != null) {
var newHeight = lowest.UnscrolledArea.Bottom - pos.Y + this.ScaledChildPadding.Bottom;
if (!newHeight.Equals(autoSize.Y, 0.01F)) {
autoSize.Y = newHeight;
foundChild = lowest;
}
}
}
if (this.SetWidthBasedOnChildren) {
var rightmost = this.GetRightmostChild(e => !e.IsHidden);
var newX = rightmost?.UnscrolledArea.Right - pos.X + this.ScaledChildPadding.Right;
if (newX != null && autoSize.X != newX) {
autoSize.X = newX.Value;
foundChild = rightmost;
if (rightmost != null) {
var newWidth = rightmost.UnscrolledArea.Right - pos.X + this.ScaledChildPadding.Right;
if (!newWidth.Equals(autoSize.X, 0.01F)) {
autoSize.X = newWidth;
foundChild = rightmost;
}
}
}
if (this.TreatSizeAsMinimum)
autoSize = Vector2.Max(autoSize, actualSize);
if (!this.Area.Size.Equals(autoSize, 0.01F)) {
if (foundChild != null) {
recursion++;
if (recursion >= 16) {
throw new ArithmeticException($"The area of {this} with root {this.Root?.Name} has recursively updated too often. Does its child {foundChild} contain any conflicting auto-sizing settings?");

2
MLEM.Ui/Elements/Panel.cs
View file

@ -218,7 +218,7 @@ namespace MLEM.Ui.Elements {
return;
// the "real" first child is the scroll bar, which we want to ignore
var firstChild = this.Children.First(c => c != this.ScrollBar);
var lowestChild = this.GetLowestChild(e => !e.IsHidden);
var lowestChild = this.GetLowestChild(c => c != this.ScrollBar && !c.IsHidden);
// the max value of the scrollbar is the amount of non-scaled pixels taken up by overflowing components
var childrenHeight = lowestChild.Area.Bottom - firstChild.Area.Top;
this.ScrollBar.MaxValue = (childrenHeight - this.Area.Height) / this.Scale + this.ChildPadding.Height;

6
MLEM.Ui/Elements/ScrollBar.cs
View file

@ -44,8 +44,10 @@ namespace MLEM.Ui.Elements {
this.maxValue = Math.Max(0, value);
// force current value to be clamped
this.CurrentValue = this.CurrentValue;
if (this.AutoHideWhenEmpty && this.IsHidden != this.maxValue <= 0) {
this.IsHidden = this.maxValue <= 0;
// auto-hide if necessary
var shouldHide = this.maxValue <= 0.01F;
if (this.AutoHideWhenEmpty && this.IsHidden != shouldHide) {
this.IsHidden = shouldHide;
this.OnAutoHide?.Invoke(this);
}
}