85 lines
2.4 KiB
C#
85 lines
2.4 KiB
C#
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/**
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* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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using System;
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using System.Runtime.InteropServices;
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namespace Facebook.Yoga
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{
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internal class YGConfigHandle : SafeHandle
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{
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internal static readonly YGConfigHandle Default = Native.YGConfigGetDefault();
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private GCHandle _managedConfigHandle;
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private YGConfigHandle() : base(IntPtr.Zero, true)
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{
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}
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public override bool IsInvalid
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{
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get
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{
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return this.handle == IntPtr.Zero;
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}
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}
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protected override bool ReleaseHandle()
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{
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if (this.handle != Default.handle)
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{
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ReleaseManaged();
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if (!IsInvalid)
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{
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Native.YGConfigFree(this.handle);
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}
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}
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GC.KeepAlive(this);
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return true;
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}
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public void SetContext(YogaConfig config)
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{
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if (!_managedConfigHandle.IsAllocated)
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{
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#if UNITY_5_4_OR_NEWER
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// Weak causes 'GCHandle value belongs to a different domain' error
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_managedConfigHandle = GCHandle.Alloc(config);
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#else
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_managedConfigHandle = GCHandle.Alloc(config, GCHandleType.Weak);
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#endif
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var managedConfigPtr = GCHandle.ToIntPtr(_managedConfigHandle);
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Native.YGConfigSetContext(this.handle, managedConfigPtr);
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}
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}
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private void ReleaseManaged()
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{
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if (_managedConfigHandle.IsAllocated)
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{
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_managedConfigHandle.Free();
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}
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}
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public static YogaConfig GetManaged(IntPtr unmanagedConfigPtr)
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{
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if (unmanagedConfigPtr != IntPtr.Zero)
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{
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var managedConfigPtr = Native.YGConfigGetContext(unmanagedConfigPtr);
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var config = GCHandle.FromIntPtr(managedConfigPtr).Target as YogaConfig;
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if (config == null)
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{
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throw new InvalidOperationException("YogaConfig is already deallocated");
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}
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return config;
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}
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return null;
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}
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}
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}
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