Version: 2021.3

SearchProvider

class in UnityEditor.Search

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描述

SearchProvider manages search for specific types of items and manages all fields of a SearchItem such as thumbnails, descriptions, subfilters.

A first example that allows to search for specific prefabs and insert them in the scene.

using System.Collections.Generic;
using UnityEditor;
using UnityEditor.Search;
using UnityEngine;

static class Example_SearchProvider
{
    internal static string id = "example_tree";
    internal static string name = "example_Tree";

    [SearchItemProvider]
    internal static SearchProvider CreateProvider()
    {
        return new SearchProvider(id, name)
        {
            filterId = "tree:",
            priority = 99999, // put example provider at a low priority
            fetchItems = (context, items, provider) =>
            {
                // That provider searches for tree prefabs in the project
                var results = AssetDatabase.FindAssets("t:Prefab tree" + context.searchQuery);
                foreach (var guid in results)
                {
                    items.Add(provider.CreateItem(context, AssetDatabase.GUIDToAssetPath(guid), null, null, null, null));
                }
                return null;
            },
            #pragma warning disable UNT0008 // Null propagation on Unity objects
            // Use fetch to load the asset asynchronously on display
            fetchThumbnail = (item, context) => AssetDatabase.GetCachedIcon(item.id) as Texture2D,
            fetchPreview = (item, context, size, options) => AssetDatabase.GetCachedIcon(item.id) as Texture2D,
            fetchLabel = (item, context) => AssetDatabase.LoadMainAssetAtPath(item.id)?.name,
            fetchDescription = (item, context) => AssetDatabase.LoadMainAssetAtPath(item.id)?.name,
            toObject = (item, type) => AssetDatabase.LoadMainAssetAtPath(item.id),
            #pragma warning restore UNT0008 // Null propagation on Unity objects
            // Shows handled actions in the preview inspector
            // Shows inspector view in the preview inspector (uses toObject)
            showDetailsOptions = ShowDetailsOptions.Inspector | ShowDetailsOptions.Actions,
            trackSelection = (item, context) =>
            {
                var obj = AssetDatabase.LoadMainAssetAtPath(item.id);
                if (obj != null)
                    EditorGUIUtility.PingObject(obj.GetInstanceID());
            },
            startDrag = (item, context) =>
            {
                var obj = AssetDatabase.LoadMainAssetAtPath(item.id);
                if (obj != null)
                {
                    DragAndDrop.PrepareStartDrag();
                    DragAndDrop.objectReferences = new Object[] { obj };
                    DragAndDrop.StartDrag(item.label);
                }
            }
        };
    }

    [SearchActionsProvider]
    internal static IEnumerable<SearchAction> ActionHandlers()
    {
        return new[]
        {
            new SearchAction(id, "Insert tree", null, "Insert a single tree in scene")
            {
                handler = (item) =>
                {
                    InsertPrefab(item.id);
                }
            },
            new SearchAction(id, "Insert forest", null, "Insert a forest in scene")
            {
                handler = (item) =>
                {
                    for (int i = 0; i < 5; i++)
                    {
                        for (int j = 0; j < 5; j++)
                        {
                            var instance = InsertPrefab(item.id);
                            if (instance != null)
                                instance.transform.Translate(i, 0, j);
                        }
                    }
                }
            }
        };
    }

    private static GameObject InsertPrefab(string id)
    {
        return (GameObject)PrefabUtility.InstantiatePrefab(AssetDatabase.LoadMainAssetAtPath(AssetDatabase.GUIDToAssetPath(id)), Selection.activeGameObject != null ? Selection.activeGameObject.transform : null);
    }

    public static void Init()
    {
        for (int i = 0; i < 5; ++i)
        {
            var go = new GameObject();
            PrefabUtility.SaveAsPrefabAsset(go, "Assets/tree" + i + ".prefab");
            Object.DestroyImmediate(go);
        }

        SearchService.ShowContextual(id);
    }
}

Another example that allows to search for lights and modify them. This provider uses another provider to get the lights.

using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.Search;
using UnityEngine;

static class SearchProviderLights
{
    static SearchProvider sceneProvider = null;
    static Texture2D lightTexture = EditorGUIUtility.FindTexture("Lighting");

    [SearchItemProvider]
    internal static SearchProvider CreateProvider()
    {
        return new SearchProvider("example_lights", "example_Lights")
        {
            filterId = "z:",
            priority = 99999, // put example provider at a low priority
            fetchItems = (context, items, provider) => FetchItems(context, provider),
            showDetailsOptions = ShowDetailsOptions.Inspector,
            toObject = ToObject,
            onEnable = OnEnable,
            onDisable = OnDisable,
            // This provider can be used in the scene and hierarchy contextual search
            isEnabledForContextualSearch = () =>
                IsFocusedWindowTypeName("SceneView") ||
                IsFocusedWindowTypeName("SceneHierarchyWindow")
        };
    }

    private static IEnumerable<SearchItem> FetchItems(SearchContext context, SearchProvider provider)
    {
        if (string.IsNullOrEmpty(context.searchQuery) || sceneProvider == null)
            yield break;

        using (var innerContext = SearchService.CreateContext(sceneProvider, "t:light " + context.searchQuery))
        using (var results = SearchService.Request(innerContext))
        {
            foreach (var r in results)
            {
                if (r != null)
                {
                    yield return provider.CreateItem(context, r.id,
                        r.GetLabel(innerContext, true), r.GetDescription(innerContext, true),
                        lightTexture, null);
                }
                else
                {
                    // ***IMPORTANT***: Make sure to yield so you do not block the main thread waiting for results.
                    yield return null;
                }
            }
        }
    }

    private static void OnEnable()
    {
        sceneProvider = SearchService.GetProvider("scene");
    }

    private static void OnDisable()
    {
        sceneProvider = null;
    }

    private static UnityEngine.Object ToObject(SearchItem item, Type type)
    {
        if (!(EditorUtility.InstanceIDToObject(int.Parse(item.id)) is GameObject light))
            return null;

        return light.GetComponent<Light>();
    }

    private static bool IsFocusedWindowTypeName(string focusWindowName)
    {
        return EditorWindow.focusedWindow != null && EditorWindow.focusedWindow.GetType().ToString().EndsWith("." + focusWindowName);
    }

    [MenuItem("Examples/SearchProvider/Show lights")]
    public static void ShowLights()
    {
        // Search for directional lights (lights with "directional" in their name)
        SearchService.ShowWindow(SearchService.CreateContext("z:directional"));
    }
}

变量

actionsSearch provider actions.
activeIndicates if the search provider is active or not. Inactive search providers are ignored by the search service. The active state can be toggled in the search settings.
fetchColumnsHandler used to enumerate search columns to be used in the Search Table view.
fetchDescriptionHandler to provide an asynchronous description for an item. Is called when the item is about to be displayed. Allows a plugin provider to only fetch long descriptions when they are needed.
fetchItemsMANDATORY: Handler to get items for a given search context. The return value is an object that can be of type IEnumerable or IEnumerator. The enumeration of those objects should return SearchItems.
fetchLabelHandler used to fetch and format the label of a search item.
fetchPreviewSimilar to fetchThumbnail, fetchPreview usually returns a bigger preview. The Search UI will progressively show one preview each frame, preventing the UI from blocking if many previews need to be generated at the same time.
fetchPropositionsHandler used to enumerate search propositions when the user is using TAB to auto-complete a query.
fetchThumbnailHandler to provide an asynchronous thumbnail for an item. Is called when the item is about to be displayed. Compared to preview a thumbnail should be small and returned as fast as possible. Use fetchPreview if you want to generate a preview that is bigger and slower to return. Allows a plugin provider to only fetch/generate previews when they are needed.
filterIdText token used to "filter" by search provider (ex: "me:", "p:", "s:").
idSearch provider unique ID.
isEnabledForContextualSearchCalled when search is invoked in "contextual mode". Returns true if the search provider is enabled for this search context.
isExplicitProviderThis search provider is only active when specified explicitly using the filterId.
nameUnique ID of the search provider.
onDisableCalled when the SearchWindow is closed. Allows the search provider to release cached resources.
onEnableCalled when the SearchWindow is opened. Allows the search provider to perform some caching.
priorityHint to sort the search provider. Affects the order of search results and the order in which search providers are shown in the FilterWindow.
showDetailsIndicates if the search provider can show additional details or not.
showDetailsOptionsDefines the details options to be shown.
startDragIf implemented, the item supports drag. It is up to the SearchProvider to properly set up the DragAndDrop manager.
toObjectReturns any valid Unity object held by the search item.
trackSelectionCalled when the selection changed and can be tracked.

构造函数

SearchProviderCreate a new SearchProvider.

公共函数

CreateItemHelper function to create a new search item for the current search provider.