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119 lines
No EOL
4.9 KiB
C#
119 lines
No EOL
4.9 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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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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/// <summary>
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/// A checkbox element to use inside of a <see cref="UiSystem"/>.
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/// A checkbox can be checked by pressing it and will stay checked until it is pressed again.
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/// For a checkbox that causes neighboring checkboxes to be deselected automatically, use <see cref="RadioButton"/>.
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/// </summary>
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public class Checkbox : Element {
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/// <summary>
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/// The texture that this checkbox uses for drawing
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/// </summary>
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public StyleProp<NinePatch> Texture;
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/// <summary>
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/// The texture that this checkbox uses when it is hovered.
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/// If this is null, the default <see cref="Texture"/> is used.
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/// </summary>
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public StyleProp<NinePatch> HoveredTexture;
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/// <summary>
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/// The color that this checkbox uses for drawing when it is hovered.
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/// </summary>
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public StyleProp<Color> HoveredColor;
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/// <summary>
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/// The texture that is rendered on top of this checkbox when it is <see cref="Checked"/>.
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/// </summary>
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public StyleProp<TextureRegion> Checkmark;
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/// <summary>
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/// The label <see cref="Paragraph"/> that displays next to this checkbox
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/// </summary>
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public Paragraph Label;
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/// <summary>
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/// The width of the space between this checkbox and its <see cref="Label"/>
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/// </summary>
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public float TextOffsetX = 2;
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private bool checced;
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/// <summary>
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/// Whether or not this checkbox is currently checked.
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/// </summary>
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public bool Checked {
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get => this.checced;
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set {
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if (this.checced != value) {
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this.checced = value;
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this.OnCheckStateChange?.Invoke(this, this.checced);
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}
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}
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}
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/// <summary>
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/// An event that is invoked when this checkbox's <see cref="Checked"/> property changes
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/// </summary>
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public CheckStateChange OnCheckStateChange;
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/// <summary>
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/// Creates a new checkbox with the given settings
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/// </summary>
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/// <param name="anchor">The checkbox's anchor</param>
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/// <param name="size">The checkbox's size</param>
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/// <param name="label">The checkbox's label text</param>
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/// <param name="defaultChecked">The default value of <see cref="Checked"/></param>
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public Checkbox(Anchor anchor, Vector2 size, string label, bool defaultChecked = false) : base(anchor, size) {
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this.checced = defaultChecked;
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this.OnPressed += element => this.Checked = !this.Checked;
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if (label != null) {
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this.Label = new Paragraph(Anchor.CenterLeft, 0, label);
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this.AddChild(this.Label);
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}
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}
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/// <inheritdoc />
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protected override Vector2 CalcActualSize(RectangleF parentArea) {
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var size = base.CalcActualSize(parentArea);
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if (this.Label != null) {
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this.Label.Size = new Vector2((size.X - size.Y) / this.Scale - this.TextOffsetX, 1);
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this.Label.PositionOffset = new Vector2(size.Y / this.Scale + this.TextOffsetX, 0);
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}
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return size;
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}
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/// <inheritdoc />
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public override void Draw(GameTime time, SpriteBatch batch, float alpha, BlendState blendState, SamplerState samplerState, Matrix matrix) {
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var tex = this.Texture;
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var color = Color.White * alpha;
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if (this.IsMouseOver) {
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tex = this.HoveredTexture.OrDefault(tex);
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color = (Color) this.HoveredColor * alpha;
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}
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var boxDisplayArea = new RectangleF(this.DisplayArea.Location, new Vector2(this.DisplayArea.Height));
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batch.Draw(tex, boxDisplayArea, color, this.Scale);
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if (this.Checked)
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batch.Draw(this.Checkmark, boxDisplayArea, Color.White * alpha);
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base.Draw(time, batch, alpha, blendState, samplerState, matrix);
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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.CheckboxTexture);
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this.HoveredTexture.SetFromStyle(style.CheckboxHoveredTexture);
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this.HoveredColor.SetFromStyle(style.CheckboxHoveredColor);
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this.Checkmark.SetFromStyle(style.CheckboxCheckmark);
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}
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/// <summary>
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/// A delegate used for <see cref="Checkbox.OnCheckStateChange"/>
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/// </summary>
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/// <param name="box">The checkbox whose checked state changed</param>
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/// <param name="checced">The new value of <see cref="Checkbox.Checked"/></param>
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public delegate void CheckStateChange(Checkbox box, bool checced);
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}
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} |