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made panels only draw and update their visible children

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This commit is contained in:
Ellpeck 2019-09-20 13:48:49 +02:00
parent c5170917fb
commit a048daefbf
2 changed files with 43 additions and 8 deletions
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15
MLEM.Ui/Elements/Element.cs
View file

@ -415,22 +415,26 @@ namespace MLEM.Ui.Elements {
yield return parent;
}
protected virtual List<Element> GetRelevantChildren() {
return this.SortedChildren;
}
public virtual void Update(GameTime time) {
foreach (var child in this.SortedChildren)
foreach (var child in this.GetRelevantChildren())
child.Update(time);
}
public virtual void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
this.System.OnElementDrawn?.Invoke(this, time, batch, alpha);
foreach (var child in this.SortedChildren) {
foreach (var child in this.GetRelevantChildren()) {
if (!child.IsHidden)
child.Draw(time, batch, alpha * child.DrawAlpha, blendState, samplerState, matrix);
}
}
public virtual void DrawEarly(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
foreach (var child in this.SortedChildren) {
foreach (var child in this.GetRelevantChildren()) {
if (!child.IsHidden)
child.DrawEarly(time, batch, alpha * child.DrawAlpha, blendState, samplerState, matrix);
}
@ -439,8 +443,9 @@ namespace MLEM.Ui.Elements {
public virtual Element GetElementUnderPos(Point position) {
if (this.IsHidden)
return null;
for (var i = this.SortedChildren.Count - 1; i >= 0; i--) {
var element = this.SortedChildren[i].GetElementUnderPos(position);
var children = this.GetRelevantChildren();
for (var i = children.Count - 1; i >= 0; i--) {
var element = children[i].GetElementUnderPos(position);
if (element != null)
return element;
}

36
MLEM.Ui/Elements/Panel.cs
View file

@ -1,4 +1,5 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using Microsoft.Xna.Framework;
@ -14,6 +15,8 @@ namespace MLEM.Ui.Elements {
public readonly ScrollBar ScrollBar;
private readonly bool scrollOverflow;
private RenderTarget2D renderTarget;
private readonly List<Element> relevantChildren = new List<Element>();
private bool relevantChildrenDirty;
public Panel(Anchor anchor, Vector2 size, Vector2 positionOffset, bool setHeightBasedOnChildren = false, bool scrollOverflow = false, Point? scrollerSize = null) : base(anchor, size) {
this.PositionOffset = positionOffset;
@ -26,7 +29,7 @@ namespace MLEM.Ui.Elements {
var scrollSize = scrollerSize ?? Point.Zero;
this.ScrollBar = new ScrollBar(Anchor.TopRight, new Vector2(scrollSize.X, 1), scrollSize.Y, 0) {
StepPerScroll = 10,
OnValueChanged = (element, value) => this.ForceChildrenScroll(),
OnValueChanged = (element, value) => this.ScrollChildren(),
CanAutoAnchorsAttach = false,
AutoHideWhenEmpty = true
};
@ -61,7 +64,7 @@ namespace MLEM.Ui.Elements {
}
base.ForceUpdateArea();
this.ForceChildrenScroll();
this.ScrollChildren();
if (this.scrollOverflow) {
// if there is only one child, then we have just the scroll bar
@ -84,12 +87,39 @@ namespace MLEM.Ui.Elements {
}
}
private void ForceChildrenScroll() {
private void ScrollChildren() {
if (!this.scrollOverflow)
return;
var offset = -this.ScrollBar.CurrentValue.Floor();
foreach (var child in this.GetChildren(c => c != this.ScrollBar, true))
child.ScrollOffset = new Point(0, offset);
this.relevantChildrenDirty = true;
}
public override void Update(GameTime time) {
if (this.relevantChildrenDirty) {
this.relevantChildrenDirty = false;
var visible = this.GetRenderTargetArea();
this.relevantChildren.Clear();
foreach (var child in this.SortedChildren) {
if (child.Area.Intersects(visible)) {
this.relevantChildren.Add(child);
} else {
foreach (var c in child.GetChildren(regardGrandchildren: true)) {
if (c.Area.Intersects(visible)) {
this.relevantChildren.Add(child);
break;
}
}
}
}
}
base.Update(time);
}
protected override List<Element> GetRelevantChildren() {
return this.scrollOverflow ? this.relevantChildren : base.GetRelevantChildren();
}
public override void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {