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https://github.com/Ellpeck/MLEM.git
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316 lines
15 KiB
C#
316 lines
15 KiB
C#
using System;
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using System.Collections.Generic;
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using Microsoft.Xna.Framework;
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using MLEM.Input;
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using MLEM.Ui.Style;
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#if FNA
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using MLEM.Extensions;
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#endif
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namespace MLEM.Ui.Elements {
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/// <summary>
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/// A tooltip element for use inside of a <see cref="UiSystem"/>.
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/// A tooltip is a <see cref="Panel"/> with a custom cursor that always follows the position of the mouse.
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/// Tooltips can easily be configured to be hooked onto an element, causing them to appear when it is moused, and disappear when it is not moused anymore.
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/// </summary>
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public class Tooltip : Panel {
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/// <summary>
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/// A list of <see cref="Elements.Paragraph"/> objects that this tooltip automatically manages.
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/// A paragraph that is contained in this list will automatically have the <see cref="UiStyle.TooltipTextWidth"/> and <see cref="UiStyle.TooltipTextColor"/> applied.
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/// To add a paragraph to both this list and to <see cref="Element.Children"/>, use <see cref="AddParagraph(Elements.Paragraph,int)"/>.
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/// </summary>
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public readonly List<Paragraph> Paragraphs = new List<Paragraph>();
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/// <summary>
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/// The offset that this tooltip's top left corner should have from the mouse position
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/// </summary>
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public StyleProp<Vector2> MouseOffset;
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/// <summary>
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/// The offset that this tooltip's top center coordinate should have from the bottom center of the element snapped to when <see cref="DisplayInAutoNavMode"/> is true.
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/// </summary>
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public StyleProp<Vector2> AutoNavOffset;
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/// <summary>
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/// The amount of time that the mouse has to be over an element before it appears
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/// </summary>
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public StyleProp<TimeSpan> Delay;
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/// <summary>
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/// The <see cref="Elements.Paragraph.TextColor"/> that this tooltip's <see cref="Paragraphs"/> should have
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/// </summary>
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public StyleProp<Color> ParagraphTextColor {
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get => this.paragraphTextColor;
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set {
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this.paragraphTextColor = value;
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this.UpdateParagraphsStyles();
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}
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}
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/// <summary>
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/// The <see cref="Elements.Paragraph.TextScale"/> that this tooltip's <see cref="Paragraphs"/> should have
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/// </summary>
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public StyleProp<float> ParagraphTextScale {
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get => this.paragraphTextScale;
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set {
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this.paragraphTextScale = value;
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this.UpdateParagraphsStyles();
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}
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}
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/// <summary>
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/// The width that this tooltip's <see cref="Paragraphs"/> should have
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/// </summary>
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public StyleProp<float> ParagraphWidth {
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get => this.paragraphWidth;
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set {
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this.paragraphWidth = value;
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this.UpdateParagraphsStyles();
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}
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}
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/// <summary>
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/// The paragraph of text that this tooltip displays
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/// </summary>
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[Obsolete("Use Paragraphs instead, which allows for multiple paragraphs to be managed by one tooltip")]
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public Paragraph Paragraph;
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/// <summary>
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/// Determines whether this tooltip should display when <see cref="UiControls.IsAutoNavMode"/> is true, which is when the UI is being controlled using a keyboard or gamepad.
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/// If this tooltip is displayed in auto-nav mode, it will display below the selected element with the <see cref="AutoNavOffset"/> applied.
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/// </summary>
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public bool DisplayInAutoNavMode;
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/// <summary>
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/// The position that this tooltip should be following (or snapped to) instead of the <see cref="InputHandler.ViewportMousePosition"/>.
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/// If this value is unset, <see cref="InputHandler.ViewportMousePosition"/> will be used as the snap position.
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/// Note that <see cref="MouseOffset"/> is still applied with this value set.
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/// </summary>
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public virtual Vector2? SnapPosition { get; set; }
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/// <inheritdoc />
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public override bool IsHidden => this.autoHidden || base.IsHidden;
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private TimeSpan delayCountdown;
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private bool autoHidden;
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private Element snapElement;
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private StyleProp<float> paragraphWidth;
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private StyleProp<float> paragraphTextScale;
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private StyleProp<Color> paragraphTextColor;
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/// <summary>
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/// Creates a new tooltip with the given settings
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/// </summary>
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/// <param name="text">The text to display on the tooltip</param>
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/// <param name="elementToHover">The element that should automatically cause the tooltip to appear and disappear when hovered and not hovered, respectively</param>
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public Tooltip(string text = null, Element elementToHover = null) :
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base(Anchor.TopLeft, Vector2.One, Vector2.Zero) {
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if (text != null) {
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#pragma warning disable CS0618
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this.Paragraph = this.AddParagraph(text);
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#pragma warning restore CS0618
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}
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this.Init(elementToHover);
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}
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/// <summary>
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/// Creates a new tooltip with the given settings
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/// </summary>
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/// <param name="textCallback">The text to display on the tooltip</param>
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/// <param name="elementToHover">The element that should automatically cause the tooltip to appear and disappear when hovered and not hovered, respectively</param>
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public Tooltip(Paragraph.TextCallback textCallback, Element elementToHover = null) :
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base(Anchor.TopLeft, Vector2.One, Vector2.Zero) {
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#pragma warning disable CS0618
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this.Paragraph = this.AddParagraph(textCallback);
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#pragma warning restore CS0618
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this.Init(elementToHover);
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}
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/// <inheritdoc />
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public override void Update(GameTime time) {
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base.Update(time);
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this.SnapPositionToMouse();
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if (this.delayCountdown > TimeSpan.Zero) {
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this.delayCountdown -= time.ElapsedGameTime;
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if (this.delayCountdown <= TimeSpan.Zero) {
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this.IsHidden = false;
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this.UpdateAutoHidden();
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this.SnapPositionToMouse();
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}
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} else {
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this.UpdateAutoHidden();
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}
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}
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/// <inheritdoc />
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public override void ForceUpdateArea() {
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if (this.Parent != null)
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throw new NotSupportedException($"A tooltip shouldn't be the child of another element ({this.Parent})");
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base.ForceUpdateArea();
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this.SnapPositionToMouse();
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}
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/// <inheritdoc />
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protected override void InitStyle(UiStyle style) {
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base.InitStyle(style);
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this.Texture = this.Texture.OrStyle(style.TooltipBackground);
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this.MouseOffset = this.MouseOffset.OrStyle(style.TooltipOffset);
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this.AutoNavOffset = this.AutoNavOffset.OrStyle(style.TooltipAutoNavOffset);
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this.Delay = this.Delay.OrStyle(style.TooltipDelay);
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this.ParagraphTextColor = this.ParagraphTextColor.OrStyle(style.TooltipTextColor);
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this.ParagraphTextScale = this.ParagraphTextScale.OrStyle(style.TextScale);
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this.ParagraphWidth = this.ParagraphWidth.OrStyle(style.TooltipTextWidth);
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this.ChildPadding = this.ChildPadding.OrStyle(style.TooltipChildPadding);
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this.UpdateParagraphsStyles();
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}
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/// <summary>
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/// Adds the given paragraph to this tooltip's managed <see cref="Paragraphs"/> list, as well as to its children using <see cref="Element.AddChild{T}"/>.
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/// A paragraph that is contained in the <see cref="Paragraphs"/> list will automatically have the <see cref="UiStyle.TooltipTextWidth"/> and <see cref="UiStyle.TooltipTextColor"/> applied.
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/// </summary>
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/// <param name="paragraph">The paragraph to add</param>
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/// <returns>The added paragraph, for chaining</returns>
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/// <param name="index">The index to add the child at, or -1 to add it to the end of the <see cref="Element.Children"/> list</param>
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public Paragraph AddParagraph(Paragraph paragraph, int index = -1) {
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this.Paragraphs.Add(paragraph);
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this.AddChild(paragraph, index);
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this.UpdateParagraphStyle(paragraph);
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return paragraph;
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}
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/// <summary>
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/// Adds a new paragraph with the given text callback to this tooltip's managed <see cref="Paragraphs"/> list, as well as to its children using <see cref="Element.AddChild{T}"/>.
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/// A paragraph that is contained in the <see cref="Paragraphs"/> list will automatically have the <see cref="UiStyle.TooltipTextWidth"/> and <see cref="UiStyle.TooltipTextColor"/> applied.
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/// </summary>
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/// <param name="text">The text that the paragraph should display</param>
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/// <returns>The created paragraph, for chaining</returns>
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/// <param name="index">The index to add the child at, or -1 to add it to the end of the <see cref="Element.Children"/> list</param>
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public Paragraph AddParagraph(Paragraph.TextCallback text, int index = -1) {
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return this.AddParagraph(new Paragraph(Anchor.AutoLeft, 0, text), index);
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}
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/// <summary>
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/// Adds a new paragraph with the given text to this tooltip's managed <see cref="Paragraphs"/> list, as well as to its children using <see cref="Element.AddChild{T}"/>.
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/// A paragraph that is contained in the <see cref="Paragraphs"/> list will automatically have the <see cref="UiStyle.TooltipTextWidth"/> and <see cref="UiStyle.TooltipTextColor"/> applied.
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/// </summary>
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/// <param name="text">The text that the paragraph should display</param>
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/// <returns>The created paragraph, for chaining</returns>
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/// <param name="index">The index to add the child at, or -1 to add it to the end of the <see cref="Element.Children"/> list</param>
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public Paragraph AddParagraph(string text, int index = -1) {
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return this.AddParagraph(p => text, index);
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}
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/// <summary>
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/// Causes this tooltip's position to be snapped to the mouse position, or the <see cref="snapElement"/> if <see cref="DisplayInAutoNavMode"/> is true, or the <see cref="SnapPosition"/> if set.
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/// </summary>
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public void SnapPositionToMouse() {
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Vector2 snapPosition;
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if (this.snapElement != null) {
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// center our snap position below the snap element
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snapPosition = new Vector2(this.snapElement.DisplayArea.Center.X, this.snapElement.DisplayArea.Bottom) + this.AutoNavOffset;
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snapPosition.X -= this.DisplayArea.Width / 2F;
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} else {
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snapPosition = (this.SnapPosition ?? this.Input.ViewportMousePosition.ToVector2()) + this.MouseOffset.Value;
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}
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var viewport = this.System.Viewport;
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var offset = snapPosition / this.Scale;
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if (offset.X < viewport.X)
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offset.X = viewport.X;
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if (offset.Y < viewport.Y)
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offset.Y = viewport.Y;
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if (offset.X * this.Scale + this.Area.Width >= viewport.Right)
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offset.X = (viewport.Right - this.Area.Width) / this.Scale;
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if (offset.Y * this.Scale + this.Area.Height >= viewport.Bottom)
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offset.Y = (viewport.Bottom - this.Area.Height) / this.Scale;
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this.PositionOffset = offset;
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}
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/// <summary>
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/// Adds this tooltip to the given <see cref="UiSystem"/> and either displays it directly or starts the <see cref="Delay"/> timer.
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/// </summary>
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/// <param name="system">The system to add this tooltip to</param>
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/// <param name="name">The name that this tooltip should use</param>
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/// <returns>Whether this tooltip was successfully added, which is not the case if it is already being displayed currently.</returns>
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public bool Display(UiSystem system, string name) {
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if (system.Add(name, this) == null)
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return false;
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if (this.Delay <= TimeSpan.Zero) {
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this.IsHidden = false;
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this.SnapPositionToMouse();
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} else {
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this.IsHidden = true;
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this.delayCountdown = this.Delay;
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}
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this.autoHidden = false;
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return true;
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}
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/// <summary>
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/// Removes this tooltip from its <see cref="UiSystem"/> and resets the <see cref="Delay"/> timer, if there is one.
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/// </summary>
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public void Remove() {
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this.delayCountdown = TimeSpan.Zero;
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if (this.System != null)
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this.System.Remove(this.Root.Name);
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}
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/// <summary>
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/// Adds this tooltip instance to the given <see cref="Element"/>, making it display when it is moused over
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/// </summary>
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/// <param name="elementToHover">The element that should automatically cause the tooltip to appear and disappear when hovered and not hovered, respectively</param>
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public void AddToElement(Element elementToHover) {
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elementToHover.OnMouseEnter += e => this.Display(e.System, $"{e.GetType().Name}Tooltip");
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elementToHover.OnMouseExit += e => this.Remove();
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elementToHover.OnSelected += e => {
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if (this.DisplayInAutoNavMode && e.Controls.IsAutoNavMode) {
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this.snapElement = e;
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this.Display(e.System, $"{e.GetType().Name}Tooltip");
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}
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};
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elementToHover.OnDeselected += e => {
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if (this.DisplayInAutoNavMode) {
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this.Remove();
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this.snapElement = null;
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}
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};
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}
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private void Init(Element elementToHover) {
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this.SetWidthBasedOnChildren = true;
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this.SetHeightBasedOnChildren = true;
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this.CanBeMoused = false;
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if (elementToHover != null)
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this.AddToElement(elementToHover);
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}
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private void UpdateAutoHidden() {
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var shouldBeHidden = true;
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foreach (var child in this.Children) {
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if (!child.IsHidden) {
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shouldBeHidden = false;
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break;
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}
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}
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if (this.autoHidden != shouldBeHidden) {
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this.autoHidden = shouldBeHidden;
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this.SetAreaDirty();
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}
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}
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private void UpdateParagraphsStyles() {
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foreach (var paragraph in this.Paragraphs)
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this.UpdateParagraphStyle(paragraph);
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#pragma warning disable CS0618
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// still set style here in case someone changed the paragraph field manually
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if (this.Paragraph != null)
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this.UpdateParagraphStyle(this.Paragraph);
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#pragma warning restore CS0618
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}
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private void UpdateParagraphStyle(Paragraph paragraph) {
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paragraph.TextColor = paragraph.TextColor.OrStyle(this.ParagraphTextColor, 1);
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paragraph.TextScale = paragraph.TextScale.OrStyle(this.ParagraphTextScale, 1);
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paragraph.Size = new Vector2(this.ParagraphWidth, 0);
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paragraph.AutoAdjustWidth = true;
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}
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}
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}
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