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cleaned up element addition/removal code

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This commit is contained in:
Ell 2022-11-24 19:46:20 +01:00
parent e21729de67
commit e5cfebef3b
3 changed files with 42 additions and 31 deletions
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47
MLEM.Ui/Elements/Element.cs
View file

@ -31,7 +31,7 @@ namespace MLEM.Ui.Elements {
/// </summary>
public UiSystem System {
get => this.system;
internal set {
private set {
this.system = value;
this.Controls = value?.Controls;
this.Style = this.Style.OrStyle(value?.Style);
@ -50,7 +50,7 @@ namespace MLEM.Ui.Elements {
/// This element's <see cref="RootElement"/>.
/// Note that this value is set even if this element has a <see cref="Parent"/>. To get the element that represents the root element, use <see cref="RootElement.Element"/>.
/// </summary>
public RootElement Root { get; internal set; }
public RootElement Root { get; private set; }
/// <summary>
/// The scale that this ui element renders with
/// </summary>
@ -481,8 +481,8 @@ namespace MLEM.Ui.Elements {
this.size = size;
this.Children = new ReadOnlyCollection<Element>(this.children);
this.GetTabNextElement += (backward, next) => next;
this.GetGamepadNextElement += (dir, next) => next;
this.GetTabNextElement = (backward, next) => next;
this.GetGamepadNextElement = (dir, next) => next;
this.SetAreaDirty();
this.SetSortedChildrenDirty();
@ -506,12 +506,7 @@ namespace MLEM.Ui.Elements {
index = this.children.Count;
this.children.Insert(index, element);
element.Parent = this;
element.AndChildren(e => {
e.Root = this.Root;
e.System = this.System;
e.OnAddedToUi?.Invoke(e);
this.Root?.InvokeOnElementAdded(e);
});
element.AndChildren(e => e.AddedToUi(this.System, this.Root));
this.OnChildAdded?.Invoke(this, element);
this.SetSortedChildrenDirty();
element.SetAreaDirty();
@ -530,12 +525,7 @@ namespace MLEM.Ui.Elements {
// upwards to us if the element is auto-positioned
element.SetAreaDirty();
element.Parent = null;
element.AndChildren(e => {
e.Root = null;
e.System = null;
e.OnRemovedFromUi?.Invoke(e);
this.Root?.InvokeOnElementRemoved(e);
});
element.AndChildren(e => e.RemovedFromUi());
this.OnChildRemoved?.Invoke(this, element);
this.SetSortedChildrenDirty();
}
@ -1190,6 +1180,31 @@ namespace MLEM.Ui.Elements {
return this.TransformInverse(position);
}
/// <summary>
/// Called when this element is added to a <see cref="UiSystem"/> and, optionally, a given <see cref="RootElement"/>.
/// This method is called in <see cref="AddChild{T}"/> and <see cref="UiSystem.Add"/>.
/// </summary>
/// <param name="system">The ui system to add to.</param>
/// <param name="root">The root element to add to.</param>
protected internal virtual void AddedToUi(UiSystem system, RootElement root) {
this.Root = root;
this.System = system;
this.OnAddedToUi?.Invoke(this);
root?.InvokeOnElementAdded(this);
}
/// <summary>
/// Called when this element is removed from a <see cref="UiSystem"/> and <see cref="RootElement"/>.
/// This method is called in <see cref="RemoveChild"/> and <see cref="UiSystem.Remove"/>.
/// </summary>
protected internal virtual void RemovedFromUi() {
var root = this.Root;
this.Root = null;
this.System = null;
this.OnRemovedFromUi?.Invoke(this);
root?.InvokeOnElementRemoved(this);
}
/// <summary>
/// A delegate used for the <see cref="Element.OnTextInput"/> event.
/// </summary>

16
MLEM.Ui/Elements/Panel.cs
View file

@ -70,13 +70,6 @@ namespace MLEM.Ui.Elements {
this.scrollOverflow = scrollOverflow;
this.CanBeSelected = false;
// we dispose our render target when removing so that it doesn't cause a memory leak
// if we're added back afterwards, it'll be recreated in ScrollSetup anyway
this.OnRemovedFromUi += _ => {
this.renderTarget?.Dispose();
this.renderTarget = null;
};
if (scrollOverflow) {
this.ScrollBar = new ScrollBar(Anchor.TopRight, Vector2.Zero, 0, 0) {
OnValueChanged = (element, value) => this.ScrollChildren(),
@ -234,6 +227,15 @@ namespace MLEM.Ui.Elements {
this.ScrollChildren();
}
/// <inheritdoc />
protected internal override void RemovedFromUi() {
base.RemovedFromUi();
// we dispose our render target when removing so that it doesn't cause a memory leak
// if we're added back afterwards, it'll be recreated in ScrollSetup anyway
this.renderTarget?.Dispose();
this.renderTarget = null;
}
/// <summary>
/// Prepares the panel for auto-scrolling, creating the render target and setting up the scroll bar's maximum value.
/// </summary>

10
MLEM.Ui/UiSystem.cs
View file

@ -345,10 +345,7 @@ namespace MLEM.Ui {
var root = new RootElement(name, element, this);
this.rootElements.Add(root);
root.Element.AndChildren(e => {
e.Root = root;
e.System = this;
e.OnAddedToUi?.Invoke(e);
root.InvokeOnElementAdded(e);
e.AddedToUi(this, root);
e.SetAreaDirty();
});
this.OnRootAdded?.Invoke(root);
@ -368,10 +365,7 @@ namespace MLEM.Ui {
this.rootElements.Remove(root);
this.Controls.SelectElement(root, null);
root.Element.AndChildren(e => {
e.Root = null;
e.System = null;
e.OnRemovedFromUi?.Invoke(e);
root.InvokeOnElementRemoved(e);
e.RemovedFromUi();
e.SetAreaDirty();
});
this.OnRootRemoved?.Invoke(root);