mirror of
https://github.com/Ellpeck/MLEM.git
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264 lines
No EOL
12 KiB
C#
264 lines
No EOL
12 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Input;
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using Microsoft.Xna.Framework.Input.Touch;
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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.Ui.Elements;
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namespace MLEM.Ui {
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public class UiControls {
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public readonly InputHandler Input;
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protected readonly bool IsInputOurs;
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protected readonly UiSystem System;
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public RootElement ActiveRoot { get; private set; }
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public Element MousedElement { get; private set; }
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private readonly Dictionary<string, Element> selectedElements = new Dictionary<string, Element>();
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public Element SelectedElement => this.GetSelectedElement(this.ActiveRoot);
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public object[] KeyboardButtons = {Keys.Space, Keys.Enter};
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public object[] GamepadButtons = {Buttons.A};
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public object[] SecondaryGamepadButtons = {Buttons.X};
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public object[] UpButtons = {Buttons.DPadUp, Buttons.LeftThumbstickUp};
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public object[] DownButtons = {Buttons.DPadDown, Buttons.LeftThumbstickDown};
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public object[] LeftButtons = {Buttons.DPadLeft, Buttons.LeftThumbstickLeft};
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public object[] RightButtons = {Buttons.DPadRight, Buttons.LeftThumbstickRight};
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public int GamepadIndex = -1;
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public bool HandleMouse = true;
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public bool HandleKeyboard = true;
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public bool HandleTouch = true;
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public bool HandleGamepad = true;
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public bool IsAutoNavMode;
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public UiControls(UiSystem system, InputHandler inputHandler = null) {
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this.System = system;
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this.Input = inputHandler ?? new InputHandler();
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this.IsInputOurs = inputHandler == null;
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// enable all required gestures
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InputHandler.EnableGestures(GestureType.Tap, GestureType.Hold);
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}
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public virtual void Update() {
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if (this.IsInputOurs)
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this.Input.Update();
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this.ActiveRoot = this.System.GetRootElements().FirstOrDefault(root => root.CanSelectContent && !root.Element.IsHidden);
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// MOUSE INPUT
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if (this.HandleMouse) {
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var mousedNow = this.GetElementUnderPos(this.Input.MousePosition.ToVector2());
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if (mousedNow != this.MousedElement) {
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if (this.MousedElement != null)
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this.System.OnElementMouseExit?.Invoke(this.MousedElement);
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if (mousedNow != null)
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this.System.OnElementMouseEnter?.Invoke(mousedNow);
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this.MousedElement = mousedNow;
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this.System.OnMousedElementChanged?.Invoke(mousedNow);
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}
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if (this.Input.IsMouseButtonPressed(MouseButton.Left)) {
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this.IsAutoNavMode = false;
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var selectedNow = mousedNow != null && mousedNow.CanBeSelected ? mousedNow : null;
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this.SelectElement(this.ActiveRoot, selectedNow);
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if (mousedNow != null && mousedNow.CanBePressed)
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this.System.OnElementPressed?.Invoke(mousedNow);
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} else if (this.Input.IsMouseButtonPressed(MouseButton.Right)) {
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this.IsAutoNavMode = false;
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if (mousedNow != null && mousedNow.CanBePressed)
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this.System.OnElementSecondaryPressed?.Invoke(mousedNow);
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}
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}
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// KEYBOARD INPUT
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if (this.HandleKeyboard) {
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if (this.KeyboardButtons.Any(this.IsAnyPressed)) {
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if (this.SelectedElement?.Root != null && this.SelectedElement.CanBePressed) {
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if (this.Input.IsModifierKeyDown(ModifierKey.Shift)) {
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// secondary action on element using space or enter
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this.System.OnElementSecondaryPressed?.Invoke(this.SelectedElement);
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} else {
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// first action on element using space or enter
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this.System.OnElementPressed?.Invoke(this.SelectedElement);
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}
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}
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} else if (this.Input.IsKeyPressed(Keys.Tab)) {
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this.IsAutoNavMode = true;
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// tab or shift-tab to next or previous element
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var backward = this.Input.IsModifierKeyDown(ModifierKey.Shift);
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var next = this.GetTabNextElement(backward);
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if (this.SelectedElement?.Root != null)
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next = this.SelectedElement.GetTabNextElement(backward, next);
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this.SelectElement(this.ActiveRoot, next);
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}
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}
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// TOUCH INPUT
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if (this.HandleTouch) {
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if (this.Input.GetGesture(GestureType.Tap, out var tap)) {
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this.IsAutoNavMode = false;
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var tapped = this.GetElementUnderPos(tap.Position);
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this.SelectElement(this.ActiveRoot, tapped);
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if (tapped != null && tapped.CanBePressed)
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this.System.OnElementPressed?.Invoke(tapped);
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} else if (this.Input.GetGesture(GestureType.Hold, out var hold)) {
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this.IsAutoNavMode = false;
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var held = this.GetElementUnderPos(hold.Position);
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this.SelectElement(this.ActiveRoot, held);
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if (held != null && held.CanBePressed)
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this.System.OnElementSecondaryPressed?.Invoke(held);
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}
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}
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// GAMEPAD INPUT
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if (this.HandleGamepad) {
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if (this.GamepadButtons.Any(this.IsAnyPressed)) {
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if (this.SelectedElement?.Root != null && this.SelectedElement.CanBePressed)
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this.System.OnElementPressed?.Invoke(this.SelectedElement);
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} else if (this.SecondaryGamepadButtons.Any(this.IsAnyPressed)) {
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if (this.SelectedElement?.Root != null && this.SelectedElement.CanBePressed)
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this.System.OnElementSecondaryPressed?.Invoke(this.SelectedElement);
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} else if (this.DownButtons.Any(this.IsAnyPressed)) {
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this.HandleGamepadNextElement(Direction2.Down);
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} else if (this.LeftButtons.Any(this.IsAnyPressed)) {
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this.HandleGamepadNextElement(Direction2.Left);
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} else if (this.RightButtons.Any(this.IsAnyPressed)) {
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this.HandleGamepadNextElement(Direction2.Right);
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} else if (this.UpButtons.Any(this.IsAnyPressed)) {
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this.HandleGamepadNextElement(Direction2.Up);
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}
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}
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}
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public virtual Element GetElementUnderPos(Vector2 position, bool transform = true) {
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foreach (var root in this.System.GetRootElements()) {
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var pos = transform ? Vector2.Transform(position, root.InvTransform) : position;
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var moused = root.Element.GetElementUnderPos(pos);
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if (moused != null)
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return moused;
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}
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return null;
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}
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public void SelectElement(RootElement root, Element element, bool? autoNav = null) {
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if (root == null)
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return;
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var selected = this.GetSelectedElement(root);
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if (selected == element)
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return;
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if (selected != null)
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this.System.OnElementDeselected?.Invoke(selected);
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if (element != null) {
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this.System.OnElementSelected?.Invoke(element);
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this.selectedElements[root.Name] = element;
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} else {
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this.selectedElements.Remove(root.Name);
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}
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this.System.OnSelectedElementChanged?.Invoke(element);
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if (autoNav != null)
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this.IsAutoNavMode = autoNav.Value;
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}
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public Element GetSelectedElement(RootElement root) {
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if (root == null)
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return null;
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this.selectedElements.TryGetValue(root.Name, out var element);
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return element;
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}
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protected virtual Element GetTabNextElement(bool backward) {
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if (this.ActiveRoot == null)
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return null;
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var children = this.ActiveRoot.Element.GetChildren(c => !c.IsHidden, true, true).Append(this.ActiveRoot.Element);
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if (this.SelectedElement?.Root != this.ActiveRoot) {
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return backward ? children.LastOrDefault(c => c.CanBeSelected) : children.FirstOrDefault(c => c.CanBeSelected);
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} else {
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var foundCurr = false;
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Element lastFound = null;
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foreach (var child in children) {
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if (!child.CanBeSelected)
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continue;
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if (child == this.SelectedElement) {
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// when going backwards, return the last element found before the current one
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if (backward)
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return lastFound;
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foundCurr = true;
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} else {
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// when going forwards, return the element after the current one
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if (!backward && foundCurr)
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return child;
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}
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lastFound = child;
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}
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return null;
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}
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}
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protected virtual Element GetGamepadNextElement(RectangleF searchArea) {
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if (this.ActiveRoot == null)
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return null;
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var children = this.ActiveRoot.Element.GetChildren(c => !c.IsHidden, true, true).Append(this.ActiveRoot.Element);
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if (this.SelectedElement?.Root != this.ActiveRoot) {
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return children.FirstOrDefault(c => c.CanBeSelected);
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} else {
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Element closest = null;
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float closestDist = 0;
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foreach (var child in children) {
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if (!child.CanBeSelected || child == this.SelectedElement || !searchArea.Intersects(child.Area))
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continue;
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var dist = Vector2.Distance(child.Area.Center, this.SelectedElement.Area.Center);
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if (closest == null || dist < closestDist) {
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closest = child;
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closestDist = dist;
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}
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}
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return closest;
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}
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}
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private bool IsAnyPressed(object button) {
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return this.Input.IsPressed(button, this.GamepadIndex);
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}
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private void HandleGamepadNextElement(Direction2 dir) {
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this.IsAutoNavMode = true;
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RectangleF searchArea = default;
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if (this.SelectedElement?.Root != null) {
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searchArea = this.SelectedElement.Area;
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var (_, _, width, height) = this.System.Viewport;
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switch (dir) {
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case Direction2.Down:
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searchArea.Height += height;
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break;
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case Direction2.Left:
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searchArea.X -= width;
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searchArea.Width += width;
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break;
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case Direction2.Right:
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searchArea.Width += width;
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break;
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case Direction2.Up:
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searchArea.Y -= height;
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searchArea.Height += height;
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break;
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}
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}
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var next = this.GetGamepadNextElement(searchArea);
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if (this.SelectedElement != null)
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next = this.SelectedElement.GetGamepadNextElement(dir, next);
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if (next != null)
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this.SelectElement(this.ActiveRoot, next);
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}
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public static void AddButtons(ref object[] controls, params object[] additional) {
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controls = controls.Concat(additional).ToArray();
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}
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}
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} |