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ensure that child padding stays consistent if ScrollerSize gets updated

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Ell 2021-11-14 20:28:53 +01:00
parent 04a206f728
commit cd48ad6e2a
1 changed files with 8 additions and 5 deletions
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13
MLEM.Ui/Elements/Panel.cs
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@ -53,6 +53,7 @@ namespace MLEM.Ui.Elements {
private RenderTarget2D renderTarget; private RenderTarget2D renderTarget;
private bool relevantChildrenDirty; private bool relevantChildrenDirty;
private float scrollBarChildOffset;
/// <summary> /// <summary>
/// Creates a new panel with the given settings. /// Creates a new panel with the given settings.
@ -229,14 +230,16 @@ namespace MLEM.Ui.Elements {
// the max value of the scrollbar is the amount of non-scaled pixels taken up by overflowing components // 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; var scrollBarMax = (childrenHeight - this.ChildPaddedArea.Height) / this.Scale;
if (!this.ScrollBar.MaxValue.Equals(scrollBarMax, Epsilon)) { if (!this.ScrollBar.MaxValue.Equals(scrollBarMax, Epsilon)) {
var wasZero = this.ScrollBar.MaxValue <= Epsilon;
this.ScrollBar.MaxValue = scrollBarMax; this.ScrollBar.MaxValue = scrollBarMax;
if (this.ScrollBar.MaxValue <= Epsilon != wasZero) { this.relevantChildrenDirty = true;
// update child padding based on whether the scroll bar is visible
this.ChildPadding += new Padding(0, this.ScrollerSize.Value.X + this.ScrollBarOffset, 0, 0) * (this.ScrollBar.IsHidden ? -1 : 1); // update child padding based on whether the scroll bar is visible
var childOffset = this.ScrollBar.IsHidden ? 0 : this.ScrollerSize.Value.X + this.ScrollBarOffset;
if (!this.scrollBarChildOffset.Equals(childOffset, Epsilon)) {
this.ChildPadding += new Padding(0, -this.scrollBarChildOffset + childOffset, 0, 0);
this.scrollBarChildOffset = childOffset;
this.SetAreaDirty(); this.SetAreaDirty();
} }
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 // 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