mirror of
https://github.com/Ellpeck/MLEM.git
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148 lines
No EOL
6.6 KiB
C#
148 lines
No EOL
6.6 KiB
C#
using System;
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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.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.Textures;
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using MLEM.Ui.Style;
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namespace MLEM.Ui.Elements {
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public class ScrollBar : Element {
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public StyleProp<NinePatch> Background;
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public StyleProp<NinePatch> ScrollerTexture;
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public Vector2 ScrollerOffset;
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public Vector2 ScrollerSize;
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private float maxValue;
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public float MaxValue {
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get => this.maxValue;
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set {
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this.maxValue = Math.Max(0, value);
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// force current value to be clamped
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this.CurrentValue = this.currValue;
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if (this.AutoHideWhenEmpty && this.IsHidden != this.maxValue <= 0) {
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this.IsHidden = this.maxValue <= 0;
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this.OnAutoHide?.Invoke(this);
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}
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}
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}
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private float currValue;
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public float CurrentValue {
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get => this.currValue;
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set {
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var val = MathHelper.Clamp(value, 0, this.maxValue);
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if (this.currValue != val) {
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this.currValue = val;
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this.OnValueChanged?.Invoke(this, val);
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}
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}
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}
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public readonly bool Horizontal;
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public float StepPerScroll = 1;
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public ValueChanged OnValueChanged;
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public GenericCallback OnAutoHide;
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private bool isMouseHeld;
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private bool isDragging;
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private bool isTouchHeld;
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public bool AutoHideWhenEmpty;
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static ScrollBar() {
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InputHandler.EnableGestures(GestureType.HorizontalDrag, GestureType.VerticalDrag);
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}
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public ScrollBar(Anchor anchor, Vector2 size, int scrollerSize, float maxValue, bool horizontal = false) : base(anchor, size) {
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this.maxValue = maxValue;
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this.Horizontal = horizontal;
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this.ScrollerSize = new Vector2(horizontal ? scrollerSize : size.X, !horizontal ? scrollerSize : size.Y);
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this.CanBeSelected = false;
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}
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public override void Update(GameTime time) {
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base.Update(time);
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// MOUSE INPUT
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var moused = this.Controls.MousedElement;
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if (moused == this && this.Controls.Input.IsMouseButtonPressed(MouseButton.Left)) {
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this.isMouseHeld = true;
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} else if (this.isMouseHeld && !this.Controls.Input.IsMouseButtonDown(MouseButton.Left)) {
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this.isMouseHeld = false;
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}
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if (this.isMouseHeld)
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this.ScrollToPos(this.Input.MousePosition.Transform(this.Root.InvTransform));
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if (!this.Horizontal && moused != null && (moused == this.Parent || moused.GetParentTree().Contains(this.Parent))) {
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var scroll = this.Input.LastScrollWheel - this.Input.ScrollWheel;
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if (scroll != 0)
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this.CurrentValue += this.StepPerScroll * Math.Sign(scroll);
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}
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// TOUCH INPUT
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if (!this.Horizontal) {
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// are we dragging on top of the panel?
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if (this.Input.GetGesture(GestureType.VerticalDrag, out var drag)) {
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// if the element under the drag's start position is on top of the panel, start dragging
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var touched = this.Parent.GetElementUnderPos(Vector2.Transform(drag.Position, this.Root.InvTransform));
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if (touched != null && touched != this)
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this.isDragging = true;
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// if we're dragging at all, then move the scroller
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if (this.isDragging)
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this.CurrentValue -= drag.Delta.Y / this.Scale;
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} else {
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this.isDragging = false;
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}
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}
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if (this.Input.TouchState.Count <= 0) {
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// if no touch has occured this tick, then reset the variable
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this.isTouchHeld = false;
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} else {
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foreach (var loc in this.Input.TouchState) {
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var pos = Vector2.Transform(loc.Position, this.Root.InvTransform);
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// if we just started touching and are on top of the scroller, then we should start scrolling
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if (this.DisplayArea.Contains(pos) && !loc.TryGetPreviousLocation(out _)) {
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this.isTouchHeld = true;
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break;
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}
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// scroll no matter if we're on the scroller right now
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if (this.isTouchHeld)
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this.ScrollToPos(pos.ToPoint());
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}
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}
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}
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private void ScrollToPos(Point position) {
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if (this.Horizontal) {
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var internalX = position.X - this.Area.X - this.ScrollerSize.X * this.Scale / 2;
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this.CurrentValue = internalX / (this.Area.Width - this.ScrollerSize.X * this.Scale) * this.MaxValue;
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} else {
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var internalY = position.Y - this.Area.Y - this.ScrollerSize.Y * this.Scale / 2;
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this.CurrentValue = internalY / (this.Area.Height - this.ScrollerSize.Y * this.Scale) * this.MaxValue;
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}
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}
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public override void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
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batch.Draw(this.Background, this.DisplayArea, Color.White * alpha, this.Scale);
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if (this.MaxValue > 0) {
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var scrollerPos = new Vector2(this.DisplayArea.X + this.ScrollerOffset.X, this.DisplayArea.Y + this.ScrollerOffset.Y);
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var scrollerOffset = new Vector2(
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!this.Horizontal ? 0 : this.currValue / this.maxValue * (this.DisplayArea.Width - this.ScrollerSize.X * this.Scale),
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this.Horizontal ? 0 : this.currValue / this.maxValue * (this.DisplayArea.Height - this.ScrollerSize.Y * this.Scale));
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var scrollerRect = new RectangleF(scrollerPos + scrollerOffset, this.ScrollerSize * this.Scale);
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batch.Draw(this.ScrollerTexture, scrollerRect, Color.White * alpha, this.Scale);
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}
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base.Draw(time, batch, alpha, blendState, samplerState, matrix);
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}
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protected override void InitStyle(UiStyle style) {
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base.InitStyle(style);
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this.Background.SetFromStyle(style.ScrollBarBackground);
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this.ScrollerTexture.SetFromStyle(style.ScrollBarScrollerTexture);
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}
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public delegate void ValueChanged(Element element, float value);
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}
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} |