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MLEM/MLEM.Ui/UiSystem.cs
2019-08-10 21:37:10 +02:00

160 lines
5.8 KiB
C#

using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Extensions;
using MLEM.Font;
using MLEM.Input;
using MLEM.Ui.Elements;
using MLEM.Ui.Style;
namespace MLEM.Ui {
public class UiSystem {
public readonly GraphicsDevice GraphicsDevice;
private readonly List<RootElement> rootElements = new List<RootElement>();
public readonly InputHandler InputHandler;
private readonly bool isInputOurs;
private float globalScale;
public float GlobalScale {
get => this.globalScale;
set {
this.globalScale = value;
foreach (var root in this.rootElements)
root.Element.ForceUpdateArea();
}
}
public Rectangle ScaledViewport {
get {
var bounds = this.GraphicsDevice.Viewport.Bounds;
return new Rectangle(bounds.X, bounds.Y, (bounds.Width / this.globalScale).Floor(), (bounds.Height / this.globalScale).Floor());
}
}
public Vector2 MousePos => this.InputHandler.MousePosition.ToVector2() / this.globalScale;
public Element MousedElement { get; private set; }
public Element SelectedElement { get; private set; }
private UiStyle style;
public UiStyle Style {
get => this.style;
set {
this.style = value;
foreach (var root in this.rootElements) {
root.Element.PropagateUiSystem(this);
root.Element.SetDirty();
}
}
}
public float DrawAlpha = 1;
public BlendState BlendState;
public SamplerState SamplerState = SamplerState.PointClamp;
public UiSystem(GameWindow window, GraphicsDevice device, UiStyle style, InputHandler inputHandler = null) {
this.GraphicsDevice = device;
this.InputHandler = inputHandler ?? new InputHandler();
this.isInputOurs = inputHandler == null;
this.style = style;
window.ClientSizeChanged += (sender, args) => {
foreach (var root in this.rootElements)
root.Element.ForceUpdateArea();
};
window.TextInput += (sender, args) => {
foreach (var root in this.rootElements)
root.Element.PropagateInput(args.Key, args.Character);
};
}
public void Update(GameTime time) {
if (this.isInputOurs)
this.InputHandler.Update();
var mousedNow = this.GetMousedElement();
if (mousedNow != this.MousedElement) {
if (this.MousedElement != null)
this.MousedElement.OnMouseExit?.Invoke(this.MousedElement, this.MousePos);
if (mousedNow != null)
mousedNow.OnMouseEnter?.Invoke(mousedNow, this.MousePos);
this.MousedElement = mousedNow;
}
if (this.SelectedElement != mousedNow && this.InputHandler.IsMouseButtonPressed(MouseButton.Left)) {
if (this.SelectedElement != null)
this.SelectedElement.OnDeselected?.Invoke(this.SelectedElement);
if (mousedNow != null)
mousedNow.OnSelected?.Invoke(mousedNow);
this.SelectedElement = mousedNow;
}
if (mousedNow?.OnClicked != null) {
foreach (var button in InputHandler.MouseButtons) {
if (this.InputHandler.IsMouseButtonPressed(button))
mousedNow.OnClicked(mousedNow, this.MousePos, button);
}
}
foreach (var root in this.rootElements)
root.Element.Update(time);
}
public void Draw(GameTime time, SpriteBatch batch) {
batch.Begin(SpriteSortMode.Deferred, this.BlendState, this.SamplerState, transformMatrix: Matrix.CreateScale(this.globalScale));
foreach (var root in this.rootElements) {
if (!root.Element.IsHidden)
root.Element.Draw(time, batch, this.DrawAlpha * root.Element.DrawAlpha);
}
batch.End();
foreach (var root in this.rootElements) {
if (!root.Element.IsHidden)
root.Element.DrawUnbound(time, batch, this.DrawAlpha * root.Element.DrawAlpha, this.BlendState, this.SamplerState);
}
}
public void Add(string name, Element root) {
if (this.IndexOf(name) >= 0)
throw new ArgumentException($"There is already a root element with name {name}");
this.rootElements.Add(new RootElement(name, root));
root.PropagateUiSystem(this);
}
public void Remove(string name) {
var index = this.IndexOf(name);
if (index < 0)
return;
this.rootElements.RemoveAt(index);
}
public Element Get(string name) {
var index = this.IndexOf(name);
return index < 0 ? null : this.rootElements[index].Element;
}
private int IndexOf(string name) {
return this.rootElements.FindIndex(element => element.Name == name);
}
private Element GetMousedElement() {
foreach (var root in this.rootElements) {
var moused = root.Element.GetMousedElement(this.MousePos);
if (moused != null)
return moused;
}
return null;
}
}
public struct RootElement {
public readonly string Name;
public readonly Element Element;
public RootElement(string name, Element element) {
this.Name = name;
this.Element = element;
}
}
}