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89 lines
No EOL
3.6 KiB
C#
89 lines
No EOL
3.6 KiB
C#
using System;
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using Microsoft.Xna.Framework;
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using MLEM.Ui.Style;
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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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/// 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 paragraph of text that this tooltip displays
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/// </summary>
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public Paragraph Paragraph;
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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="width">The width of the tooltip</param>
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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(float width, 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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this.Paragraph = this.AddChild(new Paragraph(Anchor.TopLeft, width, text));
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this.Paragraph.AutoAdjustWidth = true;
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}
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this.SetWidthBasedOnChildren = true;
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this.SetHeightBasedOnChildren = true;
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this.ChildPadding = new Vector2(2);
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this.CanBeMoused = false;
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if (elementToHover != null) {
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elementToHover.OnMouseEnter += element => {
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element.System.Add(element.GetType().Name + "Tooltip", this);
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this.SnapPositionToMouse();
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};
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elementToHover.OnMouseExit += element => {
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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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}
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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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}
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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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}
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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.SetFromStyle(style.TooltipBackground);
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this.MouseOffset.SetFromStyle(style.TooltipOffset);
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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.
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/// </summary>
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public void SnapPositionToMouse() {
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var viewport = this.System.Viewport.Size;
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var offset = this.Input.MousePosition.ToVector2() / this.Scale + this.MouseOffset;
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if (offset.X < 0)
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offset.X = 0;
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if (offset.Y < 0)
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offset.Y = 0;
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if (offset.X * this.Scale + this.Area.Width >= viewport.X)
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offset.X = (viewport.X - this.Area.Width) / this.Scale;
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if (offset.Y * this.Scale + this.Area.Height >= viewport.Y)
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offset.Y = (viewport.Y - this.Area.Height) / this.Scale;
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this.PositionOffset = offset;
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}
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}
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} |