mirror of
https://github.com/Ellpeck/MLEM.git
synced 2024-11-26 06:28:35 +01:00
484 lines
No EOL
19 KiB
C#
484 lines
No EOL
19 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Microsoft.Xna.Framework.Input;
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using MLEM.Extensions;
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using MLEM.Input;
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using MLEM.Misc;
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using MLEM.Textures;
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using MLEM.Ui.Style;
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namespace MLEM.Ui.Elements {
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public abstract class Element {
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protected readonly List<Element> Children = new List<Element>();
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private readonly List<Element> sortedChildren = new List<Element>();
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protected List<Element> SortedChildren {
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get {
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this.UpdateSortedChildrenIfDirty();
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return this.sortedChildren;
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}
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}
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private Anchor anchor;
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private Vector2 size;
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private Vector2 offset;
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public Point Padding;
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public Point ScaledPadding => this.Padding.Multiply(this.Scale);
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private Point childPadding;
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public Anchor Anchor {
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get => this.anchor;
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set {
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if (this.anchor == value)
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return;
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this.anchor = value;
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this.SetAreaDirty();
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}
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}
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public Vector2 Size {
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get => this.size;
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set {
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if (this.size == value)
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return;
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this.size = value;
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this.SetAreaDirty();
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}
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}
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public Vector2 ScaledSize => this.size * this.Scale;
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public Vector2 PositionOffset {
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get => this.offset;
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set {
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if (this.offset == value)
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return;
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this.offset = value;
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this.SetAreaDirty();
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}
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}
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public Point ScaledOffset => (this.offset * this.Scale).ToPoint();
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public Point ChildPadding {
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get => this.childPadding;
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set {
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if (this.childPadding == value)
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return;
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this.childPadding = value;
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this.SetAreaDirty();
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}
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}
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public Rectangle ChildPaddedArea => this.UnscrolledArea.Shrink(this.ScaledChildPadding);
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public Point ScaledChildPadding => this.childPadding.Multiply(this.Scale);
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public DrawCallback OnDrawn;
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public TimeCallback OnUpdated;
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public GenericCallback OnPressed;
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public GenericCallback OnSecondaryPressed;
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public GenericCallback OnSelected;
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public GenericCallback OnDeselected;
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public GenericCallback OnMouseEnter;
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public GenericCallback OnMouseExit;
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public TextInputCallback OnTextInput;
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public GenericCallback OnAreaUpdated;
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public OtherElementCallback OnMousedElementChanged;
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public OtherElementCallback OnSelectedElementChanged;
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public TabNextElementCallback GetTabNextElement;
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public GamepadNextElementCallback GetGamepadNextElement;
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private UiSystem system;
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public UiSystem System {
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get => this.system;
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internal set {
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this.system = value;
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if (this.system != null && !this.HasCustomStyle)
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this.InitStyle(this.system.Style);
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}
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}
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protected UiControls Controls => this.System.Controls;
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protected InputHandler Input => this.Controls.Input;
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public RootElement Root { get; internal set; }
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public float Scale => this.Root.ActualScale;
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public Element Parent { get; private set; }
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public bool IsMouseOver { get; private set; }
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public bool IsSelected { get; private set; }
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private bool isHidden;
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public bool IsHidden {
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get => this.isHidden;
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set {
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if (this.isHidden == value)
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return;
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this.isHidden = value;
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this.SetAreaDirty();
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}
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}
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public bool CanBeSelected = true;
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public bool CanBeMoused = true;
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public float DrawAlpha = 1;
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public bool HasCustomStyle;
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public bool SetHeightBasedOnChildren;
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public bool CanAutoAnchorsAttach = true;
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private Rectangle area;
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public Rectangle UnscrolledArea {
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get {
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this.UpdateAreaIfDirty();
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return this.area;
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}
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}
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public Rectangle Area => this.UnscrolledArea.OffsetCopy(this.ScaledScrollOffset);
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public Point ScrollOffset;
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public Point ScaledScrollOffset => this.ScrollOffset.Multiply(this.Scale);
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public Rectangle DisplayArea => this.Area.Shrink(this.ScaledPadding);
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private int priority;
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public int Priority {
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get => this.priority;
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set {
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this.priority = value;
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if (this.Parent != null)
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this.Parent.SetSortedChildrenDirty();
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}
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}
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private bool areaDirty;
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private bool sortedChildrenDirty;
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public NinePatch SelectionIndicator;
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public Element(Anchor anchor, Vector2 size) {
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this.anchor = anchor;
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this.size = size;
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this.OnMouseEnter += element => this.IsMouseOver = true;
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this.OnMouseExit += element => this.IsMouseOver = false;
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this.OnSelected += element => this.IsSelected = true;
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this.OnDeselected += element => this.IsSelected = false;
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this.GetTabNextElement = (backward, next) => next;
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this.GetGamepadNextElement = (dir, next) => next;
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this.SetAreaDirty();
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}
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public T AddChild<T>(T element, int index = -1) where T : Element {
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if (index < 0 || index > this.Children.Count)
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index = this.Children.Count;
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this.Children.Insert(index, element);
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element.Parent = this;
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element.AndChildren(e => {
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e.Root = this.Root;
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e.System = this.System;
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});
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this.SetSortedChildrenDirty();
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this.SetAreaDirty();
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return element;
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}
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public void RemoveChild(Element element) {
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this.Children.Remove(element);
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element.Parent = null;
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element.AndChildren(e => {
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e.Root = null;
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e.System = null;
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});
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this.SetSortedChildrenDirty();
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this.SetAreaDirty();
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}
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public void RemoveChildren(Func<Element, bool> condition = null) {
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for (var i = this.Children.Count - 1; i >= 0; i--) {
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var child = this.Children[i];
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if (condition == null || condition(child)) {
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this.RemoveChild(child);
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}
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}
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}
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public void SetAreaDirty() {
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this.areaDirty = true;
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if (this.Anchor >= Anchor.AutoLeft && this.Parent != null)
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this.Parent.SetAreaDirty();
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}
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public void SetSortedChildrenDirty() {
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this.sortedChildrenDirty = true;
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}
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public void UpdateSortedChildrenIfDirty() {
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if (this.sortedChildrenDirty) {
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this.sortedChildrenDirty = false;
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this.sortedChildren.Clear();
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this.sortedChildren.AddRange(this.Children);
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this.sortedChildren.Sort((e1, e2) => e1.Priority.CompareTo(e2.Priority));
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}
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}
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public void UpdateAreaIfDirty() {
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if (this.areaDirty)
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this.ForceUpdateArea();
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}
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public virtual void ForceUpdateArea() {
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this.areaDirty = false;
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if (this.IsHidden)
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return;
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var parentArea = this.Parent != null ? this.Parent.ChildPaddedArea : this.system.Viewport;
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var parentCenterX = parentArea.X + parentArea.Width / 2;
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var parentCenterY = parentArea.Y + parentArea.Height / 2;
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var actualSize = this.CalcActualSize(parentArea);
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var pos = new Point();
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switch (this.anchor) {
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case Anchor.TopLeft:
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case Anchor.AutoLeft:
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case Anchor.AutoInline:
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case Anchor.AutoInlineIgnoreOverflow:
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pos.X = parentArea.X + this.ScaledOffset.X;
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pos.Y = parentArea.Y + this.ScaledOffset.Y;
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break;
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case Anchor.TopCenter:
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case Anchor.AutoCenter:
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pos.X = parentCenterX - actualSize.X / 2 + this.ScaledOffset.X;
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pos.Y = parentArea.Y + this.ScaledOffset.Y;
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break;
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case Anchor.TopRight:
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case Anchor.AutoRight:
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pos.X = parentArea.Right - actualSize.X - this.ScaledOffset.X;
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pos.Y = parentArea.Y + this.ScaledOffset.Y;
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break;
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case Anchor.CenterLeft:
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pos.X = parentArea.X + this.ScaledOffset.X;
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pos.Y = parentCenterY - actualSize.Y / 2 + this.ScaledOffset.Y;
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break;
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case Anchor.Center:
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pos.X = parentCenterX - actualSize.X / 2 + this.ScaledOffset.X;
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pos.Y = parentCenterY - actualSize.Y / 2 + this.ScaledOffset.Y;
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break;
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case Anchor.CenterRight:
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pos.X = parentArea.Right - actualSize.X - this.ScaledOffset.X;
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pos.Y = parentCenterY - actualSize.Y / 2 + this.ScaledOffset.Y;
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break;
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case Anchor.BottomLeft:
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pos.X = parentArea.X + this.ScaledOffset.X;
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pos.Y = parentArea.Bottom - actualSize.Y - this.ScaledOffset.Y;
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break;
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case Anchor.BottomCenter:
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pos.X = parentCenterX - actualSize.X / 2 + this.ScaledOffset.X;
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pos.Y = parentArea.Bottom - actualSize.Y - this.ScaledOffset.Y;
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break;
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case Anchor.BottomRight:
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pos.X = parentArea.Right - actualSize.X - this.ScaledOffset.X;
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pos.Y = parentArea.Bottom - actualSize.Y - this.ScaledOffset.Y;
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break;
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}
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if (this.Anchor >= Anchor.AutoLeft) {
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Element previousChild;
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if (this.Anchor == Anchor.AutoInline || this.Anchor == Anchor.AutoInlineIgnoreOverflow) {
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previousChild = this.GetOlderSibling(e => !e.IsHidden && e.CanAutoAnchorsAttach);
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} else {
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previousChild = this.GetLowestOlderSibling(e => !e.IsHidden && e.CanAutoAnchorsAttach);
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}
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if (previousChild != null) {
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var prevArea = previousChild.GetAreaForAutoAnchors();
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switch (this.Anchor) {
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case Anchor.AutoLeft:
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case Anchor.AutoCenter:
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case Anchor.AutoRight:
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pos.Y = prevArea.Bottom + this.ScaledOffset.Y;
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break;
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case Anchor.AutoInline:
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var newX = prevArea.Right + this.ScaledOffset.X;
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if (newX + actualSize.X <= parentArea.Right) {
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pos.X = newX;
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pos.Y = prevArea.Y;
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} else {
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pos.Y = prevArea.Bottom + this.ScaledOffset.Y;
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}
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break;
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case Anchor.AutoInlineIgnoreOverflow:
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pos.X = prevArea.Right + this.ScaledOffset.X;
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pos.Y = prevArea.Y;
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break;
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}
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}
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}
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this.area = new Rectangle(pos, actualSize);
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this.System.OnElementAreaUpdated?.Invoke(this);
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foreach (var child in this.Children)
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child.ForceUpdateArea();
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if (this.SetHeightBasedOnChildren && this.Children.Count > 0) {
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var lowest = this.GetLowestChild(e => !e.IsHidden);
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if (lowest != null) {
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var newHeight = (lowest.UnscrolledArea.Bottom - pos.Y + this.ScaledChildPadding.Y) / this.Scale;
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if (newHeight != this.size.Y) {
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this.size.Y = newHeight;
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this.ForceUpdateArea();
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}
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}
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}
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}
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protected virtual Point CalcActualSize(Rectangle parentArea) {
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return new Point(
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(this.size.X > 1 ? this.ScaledSize.X : parentArea.Width * this.size.X).Ceil(),
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(this.size.Y > 1 ? this.ScaledSize.Y : parentArea.Height * this.size.Y).Ceil());
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}
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protected virtual Rectangle GetAreaForAutoAnchors() {
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return this.UnscrolledArea;
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}
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public Element GetLowestChild(Func<Element, bool> condition = null) {
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Element lowest = null;
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// the lowest child is expected to be towards the back, so search is usually faster if done backwards
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for (var i = this.Children.Count - 1; i >= 0; i--) {
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var child = this.Children[i];
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if (condition != null && !condition(child))
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continue;
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if (child.Anchor > Anchor.TopRight && child.Anchor < Anchor.AutoLeft)
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continue;
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if (lowest == null || child.UnscrolledArea.Bottom > lowest.UnscrolledArea.Bottom)
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lowest = child;
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}
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return lowest;
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}
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public Element GetLowestOlderSibling(Func<Element, bool> condition = null) {
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if (this.Parent == null)
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return null;
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Element lowest = null;
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foreach (var child in this.Parent.Children) {
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if (child == this)
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break;
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if (condition != null && !condition(child))
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continue;
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if (lowest == null || child.UnscrolledArea.Bottom >= lowest.UnscrolledArea.Bottom)
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lowest = child;
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}
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return lowest;
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}
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public Element GetOlderSibling(Func<Element, bool> condition = null) {
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if (this.Parent == null)
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return null;
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Element older = null;
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foreach (var child in this.Parent.Children) {
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if (child == this)
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break;
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if (condition != null && !condition(child))
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continue;
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older = child;
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}
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return older;
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}
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public IEnumerable<Element> GetSiblings(Func<Element, bool> condition = null) {
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if (this.Parent == null)
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yield break;
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foreach (var child in this.Parent.Children) {
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if (condition != null && !condition(child))
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continue;
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if (child != this)
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yield return child;
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}
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}
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public IEnumerable<Element> GetChildren(Func<Element, bool> condition = null, bool regardGrandchildren = false, bool ignoreFalseGrandchildren = false) {
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foreach (var child in this.Children) {
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var applies = condition == null || condition(child);
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if (applies)
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yield return child;
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if (regardGrandchildren && (!ignoreFalseGrandchildren || applies)) {
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foreach (var cc in child.GetChildren(condition, true, ignoreFalseGrandchildren))
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yield return cc;
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}
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}
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}
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public IEnumerable<T> GetChildren<T>(Func<T, bool> condition = null, bool regardGrandchildren = false, bool ignoreFalseGrandchildren = false) where T : Element {
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foreach (var child in this.Children) {
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var applies = child is T t && (condition == null || condition(t));
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if (applies)
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yield return (T) child;
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if (regardGrandchildren && (!ignoreFalseGrandchildren || applies)) {
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foreach (var cc in child.GetChildren(condition, true, ignoreFalseGrandchildren))
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yield return cc;
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}
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}
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}
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public IEnumerable<Element> GetParentTree() {
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if (this.Parent == null)
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yield break;
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yield return this.Parent;
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foreach (var parent in this.Parent.GetParentTree())
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yield return parent;
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}
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protected virtual List<Element> GetRelevantChildren() {
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return this.SortedChildren;
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}
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public virtual void Update(GameTime time) {
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this.System.OnElementUpdated?.Invoke(this, time);
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foreach (var child in this.GetRelevantChildren())
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child.Update(time);
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}
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public virtual void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
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this.System.OnElementDrawn?.Invoke(this, time, batch, alpha);
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foreach (var child in this.GetRelevantChildren()) {
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if (!child.IsHidden)
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child.Draw(time, batch, alpha * child.DrawAlpha, blendState, samplerState, matrix);
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}
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}
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public virtual void DrawEarly(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
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foreach (var child in this.GetRelevantChildren()) {
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if (!child.IsHidden)
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child.DrawEarly(time, batch, alpha * child.DrawAlpha, blendState, samplerState, matrix);
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}
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}
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public virtual Element GetElementUnderPos(Point position) {
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if (this.IsHidden)
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return null;
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var children = this.GetRelevantChildren();
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for (var i = children.Count - 1; i >= 0; i--) {
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var element = children[i].GetElementUnderPos(position);
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if (element != null)
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return element;
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}
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return this.CanBeMoused && this.Area.Contains(position) ? this : null;
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}
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public void AndChildren(Action<Element> action) {
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action(this);
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foreach (var child in this.Children)
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child.AndChildren(action);
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}
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protected virtual void InitStyle(UiStyle style) {
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this.SelectionIndicator = style.SelectionIndicator;
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}
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public delegate void TextInputCallback(Element element, Keys key, char character);
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public delegate void GenericCallback(Element element);
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public delegate void OtherElementCallback(Element thisElement, Element otherElement);
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public delegate void DrawCallback(Element element, GameTime time, SpriteBatch batch, float alpha);
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public delegate void TimeCallback(Element element, GameTime time);
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public delegate Element TabNextElementCallback(bool backward, Element usualNext);
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public delegate Element GamepadNextElementCallback(Direction2 dir, Element usualNext);
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}
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} |