119 lines
4.5 KiB
C#
119 lines
4.5 KiB
C#
#if UNITY_EDITOR && UNITY_INPUT_SYSTEM_UI_TK_ASSET_EDITOR
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using System;
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using System.Linq.Expressions;
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using UnityEditor;
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using UnityEditor.UIElements;
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using UnityEngine.UIElements;
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namespace UnityEngine.InputSystem.Editor
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{
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internal class StateContainer
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{
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public event Action<InputActionsEditorState> StateChanged;
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private readonly VisualElement m_RootVisualElement;
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private InputActionsEditorState m_State;
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public StateContainer(VisualElement rootVisualElement, InputActionsEditorState initialState)
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{
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m_RootVisualElement = rootVisualElement;
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m_State = initialState;
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m_RootVisualElement.TrackSerializedObjectValue(initialState.serializedObject, so =>
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{
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StateChanged?.Invoke(m_State);
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});
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rootVisualElement.Bind(initialState.serializedObject);
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}
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public void Dispatch(Command command)
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{
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if (command == null)
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throw new ArgumentNullException(nameof(command));
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m_State = command(m_State);
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// why not just invoke the state changed event immediately you ask? The Dispatch method might have
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// been called from inside a UI element event handler and if we raised the event immediately, a view
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// might try to redraw itself *during* execution of the event handler.
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m_RootVisualElement.schedule.Execute(() =>
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{
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// catch exceptions here or the UIToolkit scheduled event will keep firing forever.
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try
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{
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StateChanged?.Invoke(m_State);
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}
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catch (Exception e)
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{
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Debug.LogError(e.Message);
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}
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});
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}
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public void Initialize()
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{
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StateChanged?.Invoke(m_State);
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}
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/// <summary>
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/// Return a copy of the state.
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/// </summary>
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/// <remarks>
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/// It can sometimes be necessary to get access to the state outside of a state change event, like for example
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/// when creating views in response to UI click events. This method is for those times.
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/// </remarks>
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/// <returns></returns>
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public InputActionsEditorState GetState()
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{
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return m_State;
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}
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public void Bind<TValue>(Expression<Func<InputActionsEditorState, ReactiveProperty<TValue>>> expr,
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Action<InputActionsEditorState> propertyChangedCallback)
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{
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WhenChanged(expr, propertyChangedCallback);
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propertyChangedCallback(m_State);
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}
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public void Bind(Expression<Func<InputActionsEditorState, SerializedProperty>> expr,
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Action<SerializedProperty> serializedPropertyChangedCallback)
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{
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var propertyGetterFunc = WhenChanged(expr, serializedPropertyChangedCallback);
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serializedPropertyChangedCallback(propertyGetterFunc(m_State));
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}
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public Func<InputActionsEditorState, ReactiveProperty<TValue>> WhenChanged<TValue>(Expression<Func<InputActionsEditorState, ReactiveProperty<TValue>>> expr,
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Action<InputActionsEditorState> propertyChangedCallback)
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{
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var func = ExpressionUtils.CreateGetter(expr);
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if (func == null)
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throw new ArgumentException($"Couldn't get property info from expression.");
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var prop = func(m_State);
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if (prop == null)
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throw new InvalidOperationException($"ReactiveProperty {expr} has not been assigned.");
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prop.Changed += _ => propertyChangedCallback(m_State);
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return func;
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}
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public Func<InputActionsEditorState, SerializedProperty> WhenChanged(Expression<Func<InputActionsEditorState, SerializedProperty>> expr,
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Action<SerializedProperty> serializedPropertyChangedCallback)
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{
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var serializedPropertyGetter = ExpressionUtils.CreateGetter(expr);
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if (serializedPropertyGetter == null)
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throw new ArgumentException($"Couldn't get property info from expression.");
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var serializedProperty = serializedPropertyGetter(m_State);
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if (serializedProperty == null)
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throw new InvalidOperationException($"ReactiveProperty {expr} has not been assigned.");
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m_RootVisualElement.TrackPropertyValue(serializedProperty, serializedPropertyChangedCallback);
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return serializedPropertyGetter;
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}
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}
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}
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#endif
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