122 lines
3.7 KiB
C#
122 lines
3.7 KiB
C#
using System;
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using JetBrains.Annotations;
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using Unity.Cloud.Collaborate.Assets;
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using Unity.Cloud.Collaborate.UserInterface;
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using UnityEditor;
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using UnityEngine;
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using UnityEngine.UIElements;
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namespace Unity.Cloud.Collaborate.Components
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{
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// Hopefully these features will eventually be in the default TextField eventually.
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internal class BetterTextField : TextField
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{
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/// <summary>
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/// USS class name of elements of this type.
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/// </summary>
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public const string UssClassName = "unity-better-text-field";
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/// <summary>
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/// USS class name of placeholder elements of this type.
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/// </summary>
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public const string PlaceholderUssClassName = UssClassName + "__placeholder";
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static readonly string k_StylePath = $"{CollaborateWindow.StylePath}/{nameof(BetterTextField)}.uss";
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readonly Label m_PlaceholderLabel;
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/// <summary>
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/// Notify external subscribers that value of text property changed.
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/// </summary>
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public Action<string> OnValueChangedHandler;
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public BetterTextField()
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{
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AddToClassList(UssClassName);
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styleSheets.Add(AssetDatabase.LoadAssetAtPath<StyleSheet>(k_StylePath));
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// Add and configure placeholder
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m_PlaceholderLabel = new Label { pickingMode = PickingMode.Ignore };
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m_PlaceholderLabel.AddToClassList(PlaceholderUssClassName);
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Add(m_PlaceholderLabel);
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RegisterCallback<FocusInEvent>(e => HidePlaceholder());
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RegisterCallback<FocusOutEvent>(e =>
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{
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if (string.IsNullOrEmpty(text))
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{
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ShowPlaceholder();
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}
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});
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this.RegisterValueChangedCallback(e => OnValueChangedHandler?.Invoke(e.newValue));
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}
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void UpdatePlaceholderVisibility()
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{
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if (string.IsNullOrEmpty(value))
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{
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// Value can be set before the focus control is initialised.
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if (focusController?.focusedElement != this)
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{
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ShowPlaceholder();
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}
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}
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else
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{
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HidePlaceholder();
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}
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}
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void HidePlaceholder()
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{
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m_PlaceholderLabel?.AddToClassList(UiConstants.ussHidden);
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}
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void ShowPlaceholder()
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{
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m_PlaceholderLabel?.RemoveFromClassList(UiConstants.ussHidden);
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}
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public override string value
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{
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get => base.value;
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set
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{
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// Catch case of value being set programatically.
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base.value = value;
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UpdatePlaceholderVisibility();
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}
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}
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public string Placeholder
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{
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get => m_PlaceholderLabel.text;
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set => m_PlaceholderLabel.text = value;
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}
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public override void SetValueWithoutNotify(string newValue)
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{
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base.SetValueWithoutNotify(newValue);
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UpdatePlaceholderVisibility();
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}
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[UsedImplicitly]
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public new class UxmlFactory : UxmlFactory<BetterTextField, UxmlTraits> { }
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public new class UxmlTraits : TextField.UxmlTraits
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{
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readonly UxmlStringAttributeDescription m_Hint = new UxmlStringAttributeDescription { name = "placeholder" };
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public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
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{
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base.Init(ve, bag, cc);
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var field = (BetterTextField)ve;
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field.Placeholder = m_Hint.GetValueFromBag(bag, cc);
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}
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}
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}
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}
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