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mark panel children dirty when the scroll bar's max value (the height of the children) changes

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Ell 2021-11-08 02:06:50 +01:00
parent 3d0250bf86
commit 6d554faaac
1 changed files with 9 additions and 2 deletions
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11
MLEM.Ui/Elements/Panel.cs
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@ -221,12 +221,19 @@ namespace MLEM.Ui.Elements {
// if there is only one child, then we have just the scroll bar
if (this.Children.Count == 1)
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(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.ChildPaddedArea.Height) / this.Scale;
// the max value of the scrollbar is the amount of non-scaled pixels taken up by overflowing components
var scrollBarMax = (childrenHeight - this.ChildPaddedArea.Height) / this.Scale;
if (this.ScrollBar.MaxValue != scrollBarMax) {
this.ScrollBar.MaxValue = scrollBarMax;
this.relevantChildrenDirty = true;
}
// the scroller height has the same relation to the scroll bar height as the visible area has to the total height of the panel's content
var scrollerHeight = this.ChildPaddedArea.Height / childrenHeight / this.Scale * this.ScrollBar.Area.Height;
this.ScrollBar.ScrollerSize = new Vector2(this.ScrollerSize.Value.X, Math.Max(this.ScrollerSize.Value.Y, scrollerHeight));