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added rules for text input

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This commit is contained in:
Ellpeck 2019-08-18 17:59:14 +02:00
parent 15b468bab4
commit edf073dacb
2 changed files with 18 additions and 2 deletions
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6
Demos/UiDemo.cs
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@ -64,6 +64,8 @@ namespace Demos {
root.AddChild(new Paragraph(Anchor.AutoLeft, 1, "This is a small demo for MLEM.Ui, a user interface library that is part of (M)LEM (L)ibrary by (E)llpeck for (M)onoGame."));
var image = root.AddChild(new Image(Anchor.AutoCenter, new Vector2(50, 50), new TextureRegion(this.testTexture, 0, 0, 8, 8)) {IsHidden = true, Padding = new Point(3)});
// Setting their the x or y coordinate to 1 or a lower number causes the width or height to be a percentage of the parent's width or height
// (for example, setting the size's x to 0.75 would make the element's width be 0.75*parentWidth)
root.AddChild(new Button(Anchor.AutoCenter, new Vector2(1, 10), "Toggle Test Image", "This button shows a grass tile as a test image to show the automatic anchoring of objects.") {
OnClicked = (element, button) => {
if (button == MouseButton.Left)
@ -89,6 +91,10 @@ namespace Demos {
root.AddChild(new Paragraph(Anchor.AutoCenter, 1, "Text input:", true));
root.AddChild(new TextField(Anchor.AutoLeft, new Vector2(1, 10)) {PositionOffset = new Vector2(0, 1)});
root.AddChild(new VerticalSpace(3));
root.AddChild(new Paragraph(Anchor.AutoCenter, 1, "Numbers-only input:", true));
root.AddChild(new TextField(Anchor.AutoLeft, new Vector2(1, 10), TextField.OnlyNumbers) {PositionOffset = new Vector2(0, 1)});
root.AddChild(new VerticalSpace(3));
root.AddChild(new Paragraph(Anchor.AutoLeft, 1, "Zoom in or out:"));
root.AddChild(new Button(Anchor.AutoLeft, new Vector2(10), "+") {

14
MLEM.Ui/Elements/TextField.cs
View file

@ -1,4 +1,5 @@
using System;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
@ -11,6 +12,11 @@ using MLEM.Ui.Style;
namespace MLEM.Ui.Elements {
public class TextField : Element {
public static readonly Rule DefaultRule = (field, add) => !add.Any(char.IsControl);
public static readonly Rule OnlyLetters = (field, add) => add.All(char.IsLetter);
public static readonly Rule OnlyNumbers = (field, add) => add.All(char.IsNumber);
public static readonly Rule LettersNumbers = (field, add) => add.All(c => char.IsLetter(c) || char.IsNumber(c));
public NinePatch Texture;
public NinePatch HoveredTexture;
public Color HoveredColor;
@ -22,8 +28,10 @@ namespace MLEM.Ui.Elements {
private IGenericFont font;
private double caretBlinkTimer;
private int textStartIndex;
public Rule InputRule;
public TextField(Anchor anchor, Vector2 size, IGenericFont font = null) : base(anchor, size) {
public TextField(Anchor anchor, Vector2 size, Rule rule = null, IGenericFont font = null) : base(anchor, size) {
this.InputRule = rule ?? DefaultRule;
this.font = font;
this.OnTextInput += (element, key, character) => {
if (!this.IsSelected)
@ -34,7 +42,7 @@ namespace MLEM.Ui.Elements {
this.Text.Remove(this.Text.Length - 1, 1);
textChanged = true;
}
} else if (!char.IsControl(character)) {
} else if (this.InputRule(this, character.ToString())) {
if (this.Text.Length < this.MaxTextLength) {
this.Text.Append(character);
textChanged = true;
@ -94,5 +102,7 @@ namespace MLEM.Ui.Elements {
public delegate void TextChanged(TextField field, string text);
public delegate bool Rule(TextField field, string textToAdd);
}
}