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https://github.com/Ellpeck/MLEM.git
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568 lines
26 KiB
C#
568 lines
26 KiB
C#
using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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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;
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using MLEM.Extensions;
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using MLEM.Font;
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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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using TextCopy;
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namespace MLEM.Ui.Elements {
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/// <summary>
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/// A text field element for use inside of a <see cref="UiSystem"/>.
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/// A text field is a selectable element that can be typed in, as well as copied and pasted from.
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/// If an on-screen keyboard is required, then this text field will automatically open an on-screen keyboard using <see cref="MlemPlatform.OpenOnScreenKeyboard"/>.
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/// </summary>
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public class TextField : Element {
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/// <summary>
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/// A <see cref="Rule"/> that allows any visible character and spaces
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/// </summary>
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public static readonly Rule DefaultRule = (field, add) => {
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foreach (var c in add) {
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if (char.IsControl(c) && (!field.Multiline || c != '\n'))
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return false;
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}
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return true;
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};
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/// <summary>
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/// A <see cref="Rule"/> that only allows letters
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/// </summary>
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public static readonly Rule OnlyLetters = (field, add) => {
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foreach (var c in add) {
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if (!char.IsLetter(c))
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return false;
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}
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return true;
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};
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/// <summary>
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/// A <see cref="Rule"/> that only allows numerals
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/// </summary>
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public static readonly Rule OnlyNumbers = (field, add) => {
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foreach (var c in add) {
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if (!char.IsNumber(c))
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return false;
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}
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return true;
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};
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/// <summary>
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/// A <see cref="Rule"/> that only allows letters and numerals
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/// </summary>
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public static readonly Rule LettersNumbers = (field, add) => {
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foreach (var c in add) {
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if (!char.IsLetter(c) || !char.IsNumber(c))
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return false;
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}
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return true;
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};
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/// <summary>
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/// A <see cref="Rule"/> that only allows characters not contained in <see cref="Path.GetInvalidPathChars"/>
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/// </summary>
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public static readonly Rule PathNames = (field, add) => add.IndexOfAny(Path.GetInvalidPathChars()) < 0;
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/// <summary>
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/// A <see cref="Rule"/> that only allows characters not contained in <see cref="Path.GetInvalidFileNameChars"/>
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/// </summary>
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public static readonly Rule FileNames = (field, add) => add.IndexOfAny(Path.GetInvalidFileNameChars()) < 0;
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/// <summary>
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/// The color that this text field's text should display with
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/// </summary>
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public StyleProp<Color> TextColor;
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/// <summary>
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/// The color that the <see cref="PlaceholderText"/> should display with
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/// </summary>
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public StyleProp<Color> PlaceholderColor;
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/// <summary>
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/// This text field's texture
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/// </summary>
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public StyleProp<NinePatch> Texture;
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/// <summary>
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/// This text field's texture while it is hovered
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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 text field should display with while 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 scale that this text field should render text with
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/// </summary>
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public StyleProp<float> TextScale;
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/// <summary>
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/// The font that this text field should display text with
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/// </summary>
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public StyleProp<GenericFont> Font;
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/// <summary>
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/// This text field's current text
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/// </summary>
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public string Text => this.text.ToString();
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/// <summary>
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/// The text that displays in this text field if <see cref="Text"/> is empty
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/// </summary>
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public string PlaceholderText;
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/// <summary>
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/// An event that gets called when <see cref="Text"/> changes, either through input, or through a manual change.
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/// </summary>
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public TextChanged OnTextChange;
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/// <summary>
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/// The x position that text should start rendering at, based on the x position of this text field.
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/// </summary>
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public float TextOffsetX = 4;
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/// <summary>
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/// The width that the caret should render with.
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/// </summary>
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public float CaretWidth = 0.5F;
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/// <summary>
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/// The rule used for text input.
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/// Rules allow only certain characters to be allowed inside of a text field.
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/// </summary>
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public Rule InputRule;
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/// <summary>
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/// The title of the <c>KeyboardInput</c> field on mobile devices and consoles
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/// </summary>
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public string MobileTitle;
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/// <summary>
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/// The description of the <c>KeyboardInput</c> field on mobile devices and consoles
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/// </summary>
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public string MobileDescription;
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/// <summary>
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/// The position of the caret within the text.
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/// This is always between 0 and the <see cref="string.Length"/> of <see cref="Text"/>
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/// </summary>
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public int CaretPos {
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get => this.caretPos;
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set {
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var val = MathHelper.Clamp(value, 0, this.text.Length);
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if (this.caretPos != val) {
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this.caretPos = val;
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this.caretBlinkTimer = 0;
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this.HandleTextChange(false);
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}
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}
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}
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/// <summary>
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/// The line of text that the caret is currently on.
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/// This can only be only non-0 if <see cref="Multiline"/> is true.
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/// </summary>
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public int CaretLine { get; private set; }
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/// <summary>
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/// The position in the current <see cref="CaretLine"/> that the caret is currently on.
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/// If <see cref="Multiline"/> is false, this value is always equal to <see cref="CaretPos"/>.
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/// </summary>
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public int CaretPosInLine { get; private set; }
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/// <summary>
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/// A character that should be displayed instead of this text field's <see cref="Text"/> content.
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/// The amount of masking characters displayed will be equal to the <see cref="Text"/>'s length.
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/// This behavior is useful for password fields or similar.
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/// </summary>
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public char? MaskingCharacter {
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get => this.maskingCharacter;
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set {
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this.maskingCharacter = value;
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this.HandleTextChange(false);
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}
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}
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/// <summary>
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/// The maximum amount of characters that can be input into this text field.
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/// If this is set, the length of <see cref="Text"/> will never exceed this value.
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/// </summary>
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public int? MaximumCharacters;
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/// <summary>
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/// Whether this text field should support multi-line editing.
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/// If this is true, pressing <see cref="Keys.Enter"/> will insert a new line into the <see cref="Text"/> if the <see cref="InputRule"/> allows it.
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/// Additionally, text will be rendered with horizontal soft wraps, and lines that are outside of the text field's bounds will be hidden.
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/// </summary>
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public bool Multiline {
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get => this.multiline;
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set {
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this.multiline = value;
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this.HandleTextChange(false);
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}
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}
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private readonly StringBuilder text = new StringBuilder();
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private char? maskingCharacter;
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private double caretBlinkTimer;
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private string displayedText;
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private string[] splitText;
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private int textOffset;
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private int lineOffset;
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private int caretPos;
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private float caretDrawOffset;
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private bool multiline;
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/// <summary>
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/// Creates a new text field with the given settings
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/// </summary>
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/// <param name="anchor">The text field's anchor</param>
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/// <param name="size">The text field's size</param>
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/// <param name="rule">The text field's input rule</param>
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/// <param name="font">The font to use for drawing text</param>
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/// <param name="text">The text that the text field should contain by default</param>
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/// <param name="multiline">Whether the text field should support multi-line editing</param>
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public TextField(Anchor anchor, Vector2 size, Rule rule = null, GenericFont font = null, string text = null, bool multiline = false) : base(anchor, size) {
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this.InputRule = rule ?? DefaultRule;
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this.Multiline = multiline;
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if (font != null)
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this.Font.Set(font);
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if (text != null)
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this.SetText(text, true);
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MlemPlatform.EnsureExists();
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this.OnPressed += OnPressed;
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this.OnTextInput += (element, key, character) => {
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if (!this.IsSelected || this.IsHidden)
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return;
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if (key == Keys.Back) {
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if (this.CaretPos > 0) {
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this.CaretPos--;
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this.RemoveText(this.CaretPos, 1);
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}
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} else if (key == Keys.Delete) {
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this.RemoveText(this.CaretPos, 1);
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} else if (this.Multiline && key == Keys.Enter) {
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this.InsertText('\n');
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} else {
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this.InsertText(character);
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}
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};
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this.OnDeselected += e => this.CaretPos = 0;
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this.OnSelected += e => this.CaretPos = this.text.Length;
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async void OnPressed(Element e) {
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var title = this.MobileTitle ?? this.PlaceholderText;
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var result = await MlemPlatform.Current.OpenOnScreenKeyboard(title, this.MobileDescription, this.Text, false);
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if (result != null)
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this.SetText(this.Multiline ? result : result.Replace('\n', ' '), true);
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}
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}
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/// <inheritdoc />
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public override void Update(GameTime time) {
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base.Update(time);
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// handle first initialization if not done
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if (this.displayedText == null)
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this.HandleTextChange(false);
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if (!this.IsSelected || this.IsHidden)
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return;
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if (this.Input.IsKeyPressed(Keys.Left)) {
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this.CaretPos--;
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} else if (this.Input.IsKeyPressed(Keys.Right)) {
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this.CaretPos++;
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} else if (this.Multiline && this.Input.IsKeyPressed(Keys.Up)) {
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this.MoveCaretToLine(this.CaretLine - 1);
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} else if (this.Multiline && this.Input.IsKeyPressed(Keys.Down)) {
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this.MoveCaretToLine(this.CaretLine + 1);
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} else if (this.Input.IsKeyPressed(Keys.Home)) {
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this.CaretPos = 0;
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} else if (this.Input.IsKeyPressed(Keys.End)) {
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this.CaretPos = this.text.Length;
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} else if (this.Input.IsModifierKeyDown(ModifierKey.Control)) {
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if (this.Input.IsKeyPressed(Keys.V)) {
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var clip = ClipboardService.GetText();
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if (clip != null)
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this.InsertText(clip, true);
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} else if (this.Input.IsKeyPressed(Keys.C)) {
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// until there is text selection, just copy the whole content
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ClipboardService.SetText(this.Text);
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}
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}
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this.caretBlinkTimer += time.ElapsedGameTime.TotalSeconds;
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if (this.caretBlinkTimer >= 1)
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this.caretBlinkTimer = 0;
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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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batch.Draw(tex, this.DisplayArea, color, this.Scale);
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if (this.displayedText != null) {
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var lineHeight = this.Font.Value.LineHeight * this.TextScale * this.Scale;
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var offset = new Vector2(
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this.TextOffsetX * this.Scale,
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this.Multiline ? this.TextOffsetX * this.Scale : this.DisplayArea.Height / 2 - lineHeight / 2);
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var textPos = this.DisplayArea.Location + offset;
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if (this.text.Length > 0 || this.IsSelected) {
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var textColor = this.TextColor.OrDefault(Color.White);
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this.Font.Value.DrawString(batch, this.displayedText, textPos, textColor * alpha, 0, Vector2.Zero, this.TextScale * this.Scale, SpriteEffects.None, 0);
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if (this.IsSelected && this.caretBlinkTimer < 0.5F) {
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var caretDrawPos = textPos + new Vector2(this.caretDrawOffset * this.TextScale * this.Scale, 0);
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if (this.Multiline)
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caretDrawPos.Y += this.Font.Value.LineHeight * (this.CaretLine - this.lineOffset) * this.TextScale * this.Scale;
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batch.Draw(batch.GetBlankTexture(), new RectangleF(caretDrawPos, new Vector2(this.CaretWidth * this.Scale, lineHeight)), null, textColor * alpha);
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}
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} else if (this.PlaceholderText != null) {
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this.Font.Value.DrawString(batch, this.PlaceholderText, textPos, this.PlaceholderColor.OrDefault(Color.Gray) * alpha, 0, Vector2.Zero, this.TextScale * this.Scale, SpriteEffects.None, 0);
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}
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}
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base.Draw(time, batch, alpha, blendState, samplerState, matrix);
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}
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/// <summary>
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/// Replaces this text field's text with the given text.
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/// If the resulting <see cref="Text"/> exceeds <see cref="MaximumCharacters"/>, the end will be cropped to fit.
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/// </summary>
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/// <param name="text">The new text</param>
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/// <param name="removeMismatching">If any characters that don't match the <see cref="InputRule"/> should be left out</param>
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public void SetText(object text, bool removeMismatching = false) {
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var strg = text?.ToString() ?? string.Empty;
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if (!this.FilterText(ref strg, removeMismatching))
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return;
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if (this.MaximumCharacters != null && strg.Length > this.MaximumCharacters)
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strg = strg.Substring(0, this.MaximumCharacters.Value);
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this.text.Clear();
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this.text.Append(strg);
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this.CaretPos = this.text.Length;
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this.HandleTextChange();
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}
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/// <summary>
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/// Inserts the given text at the <see cref="CaretPos"/>.
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/// If the resulting <see cref="Text"/> exceeds <see cref="MaximumCharacters"/>, the end will be cropped to fit.
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/// </summary>
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/// <param name="text">The text to insert</param>
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/// <param name="removeMismatching">If any characters that don't match the <see cref="InputRule"/> should be left out</param>
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public void InsertText(object text, bool removeMismatching = false) {
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var strg = text?.ToString() ?? string.Empty;
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if (!this.FilterText(ref strg, removeMismatching))
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return;
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if (this.MaximumCharacters != null && this.text.Length + strg.Length > this.MaximumCharacters)
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strg = strg.Substring(0, this.MaximumCharacters.Value - this.text.Length);
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this.text.Insert(this.CaretPos, strg);
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this.CaretPos += strg.Length;
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this.HandleTextChange();
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}
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/// <summary>
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/// Removes the given amount of text at the given index
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/// </summary>
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/// <param name="index">The index</param>
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/// <param name="length">The amount of text to remove</param>
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public void RemoveText(int index, int length) {
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if (index < 0 || index >= this.text.Length)
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return;
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this.text.Remove(index, length);
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// ensure that caret pos is still in bounds
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this.CaretPos = this.CaretPos;
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this.HandleTextChange();
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}
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/// <summary>
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/// Moves the <see cref="CaretPos"/> to the given line, if it exists.
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/// Additionally maintains the <see cref="CaretPosInLine"/> roughly based on the visual distance that the caret has from the left border of the current <see cref="CaretLine"/>.
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/// </summary>
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/// <param name="line">The line to move the caret to</param>
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/// <returns>True if the caret was moved, false if it was not (which indicates that the line with the given <paramref name="line"/> index does not exist)</returns>
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public bool MoveCaretToLine(int line) {
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var (destStart, destEnd) = this.GetLineBounds(line);
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if (destEnd > 0) {
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// find the position whose distance from the start is closest to the current distance from the start
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var destAccum = "";
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while (destAccum.Length < destEnd - destStart) {
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if (this.Font.Value.MeasureString(destAccum).X >= this.caretDrawOffset) {
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this.CaretPos = destStart + destAccum.Length;
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return true;
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}
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destAccum += this.text[destStart + destAccum.Length];
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}
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// if we don't find a proper position, just move to the end of the destination line
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this.CaretPos = destEnd;
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return true;
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}
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return false;
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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.TextScale.SetFromStyle(style.TextScale);
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this.Font.SetFromStyle(style.Font);
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this.Texture.SetFromStyle(style.TextFieldTexture);
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this.HoveredTexture.SetFromStyle(style.TextFieldHoveredTexture);
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this.HoveredColor.SetFromStyle(style.TextFieldHoveredColor);
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}
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private bool FilterText(ref string text, bool removeMismatching) {
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if (removeMismatching) {
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var result = new StringBuilder();
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foreach (var c in text) {
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if (this.InputRule(this, c.ToCachedString()))
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result.Append(c);
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}
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text = result.ToString();
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} else if (!this.InputRule(this, text))
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return false;
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return true;
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}
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private void HandleTextChange(bool textChanged = true) {
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// not initialized yet
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if (!this.Font.HasValue())
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return;
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var maxWidth = this.DisplayArea.Width / this.Scale - this.TextOffsetX * 2;
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if (this.Multiline) {
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// soft wrap if we're multiline
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this.splitText = this.Font.Value.SplitStringSeparate(this.text.ToString(), maxWidth, this.TextScale).ToArray();
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this.displayedText = string.Join("\n", this.splitText);
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this.UpdateCaretData();
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var maxHeight = this.DisplayArea.Height / this.Scale - this.TextOffsetX * 2;
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if (this.Font.Value.MeasureString(this.displayedText).Y * this.TextScale > maxHeight) {
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var maxLines = (maxHeight / (this.Font.Value.LineHeight * this.TextScale)).Floor();
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if (this.lineOffset > this.CaretLine) {
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// if we're moving up
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this.lineOffset = this.CaretLine;
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} else if (this.CaretLine >= maxLines) {
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// if we're moving down
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var limit = this.CaretLine - (maxLines - 1);
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if (limit > this.lineOffset)
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this.lineOffset = limit;
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}
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// calculate resulting string
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var ret = new StringBuilder();
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var lines = 0;
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var originalIndex = 0;
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for (var i = 0; i < this.displayedText.Length; i++) {
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if (lines >= this.lineOffset) {
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if (ret.Length <= 0)
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this.textOffset = originalIndex;
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ret.Append(this.displayedText[i]);
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}
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if (this.displayedText[i] == '\n') {
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lines++;
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if (this.text[originalIndex] == '\n')
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originalIndex++;
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} else {
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originalIndex++;
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}
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if (lines - this.lineOffset >= maxLines)
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break;
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}
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this.displayedText = ret.ToString();
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} else {
|
|
this.lineOffset = 0;
|
|
this.textOffset = 0;
|
|
}
|
|
} else {
|
|
// not multiline, so scroll horizontally based on caret position
|
|
if (this.Font.Value.MeasureString(this.text.ToString()).X * this.TextScale > maxWidth) {
|
|
if (this.textOffset > this.CaretPos) {
|
|
// if we're moving the caret to the left
|
|
this.textOffset = this.CaretPos;
|
|
} else {
|
|
// if we're moving the caret to the right
|
|
var importantArea = this.text.ToString(this.textOffset, Math.Min(this.CaretPos, this.text.Length) - this.textOffset);
|
|
var bound = this.CaretPos - this.Font.Value.TruncateString(importantArea, maxWidth, this.TextScale, true).Length;
|
|
if (this.textOffset < bound)
|
|
this.textOffset = bound;
|
|
}
|
|
var visible = this.text.ToString(this.textOffset, this.text.Length - this.textOffset);
|
|
this.displayedText = this.Font.Value.TruncateString(visible, maxWidth, this.TextScale);
|
|
} else {
|
|
this.displayedText = this.Text;
|
|
this.textOffset = 0;
|
|
}
|
|
this.UpdateCaretData();
|
|
}
|
|
|
|
if (this.MaskingCharacter != null)
|
|
this.displayedText = new string(this.MaskingCharacter.Value, this.displayedText.Length);
|
|
|
|
if (textChanged)
|
|
this.OnTextChange?.Invoke(this, this.Text);
|
|
}
|
|
|
|
private void UpdateCaretData() {
|
|
if (this.splitText != null) {
|
|
var line = 0;
|
|
var index = 0;
|
|
for (var d = 0; d < this.splitText.Length; d++) {
|
|
var startOfLine = 0;
|
|
var split = this.splitText[d];
|
|
for (var i = 0; i <= split.Length; i++) {
|
|
if (index == this.CaretPos) {
|
|
this.CaretLine = line;
|
|
this.CaretPosInLine = i - startOfLine;
|
|
this.caretDrawOffset = this.Font.Value.MeasureString(split.Substring(startOfLine, this.CaretPosInLine)).X;
|
|
return;
|
|
}
|
|
if (i < split.Length) {
|
|
// manual splits
|
|
if (split[i] == '\n') {
|
|
startOfLine = i + 1;
|
|
line++;
|
|
}
|
|
index++;
|
|
}
|
|
}
|
|
// max width splits
|
|
line++;
|
|
}
|
|
} else if (this.displayedText != null) {
|
|
this.CaretLine = 0;
|
|
this.CaretPosInLine = this.CaretPos;
|
|
this.caretDrawOffset = this.Font.Value.MeasureString(this.displayedText.Substring(0, this.CaretPos - this.textOffset)).X;
|
|
}
|
|
}
|
|
|
|
private (int, int) GetLineBounds(int boundLine) {
|
|
if (this.splitText != null) {
|
|
var line = 0;
|
|
var index = 0;
|
|
var startOfLineIndex = 0;
|
|
for (var d = 0; d < this.splitText.Length; d++) {
|
|
var split = this.splitText[d];
|
|
for (var i = 0; i < split.Length; i++) {
|
|
index++;
|
|
if (split[i] == '\n') {
|
|
if (boundLine == line)
|
|
return (startOfLineIndex, index - 1);
|
|
line++;
|
|
startOfLineIndex = index;
|
|
}
|
|
}
|
|
if (boundLine == line)
|
|
return (startOfLineIndex, index - 1);
|
|
line++;
|
|
startOfLineIndex = index;
|
|
}
|
|
}
|
|
return default;
|
|
}
|
|
|
|
/// <summary>
|
|
/// A delegate method used for <see cref="TextField.OnTextChange"/>
|
|
/// </summary>
|
|
/// <param name="field">The text field whose text changed</param>
|
|
/// <param name="text">The new text</param>
|
|
public delegate void TextChanged(TextField field, string text);
|
|
|
|
/// <summary>
|
|
/// A delegate method used for <see cref="InputRule"/>.
|
|
/// It should return whether the given text can be added to the text field.
|
|
/// </summary>
|
|
/// <param name="field">The text field</param>
|
|
/// <param name="textToAdd">The text that is tried to be added</param>
|
|
public delegate bool Rule(TextField field, string textToAdd);
|
|
|
|
}
|
|
} |