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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef UI_COMPOSITOR_LAYER_OWNER_H_ | |
| 6 #define UI_COMPOSITOR_LAYER_OWNER_H_ | |
| 7 | |
| 8 #include "base/compiler_specific.h" | |
| 9 #include "base/memory/scoped_ptr.h" | |
| 10 #include "ui/compositor/compositor_export.h" | |
| 11 #include "ui/compositor/layer.h" | |
| 12 | |
| 13 namespace ui { | |
| 14 class LayerOwnerDelegate; | |
| 15 | |
| 16 class COMPOSITOR_EXPORT LayerOwner { | |
| 17 public: | |
| 18 LayerOwner(); | |
| 19 virtual ~LayerOwner(); | |
| 20 | |
| 21 void SetLayer(Layer* layer); | |
| 22 | |
| 23 // Releases the owning reference to its layer, and returns it. | |
| 24 // This is used when you need to animate the presentation of the owner just | |
| 25 // prior to destroying it. The Owner can be destroyed soon after calling this | |
| 26 // function, and the caller is then responsible for disposing of the layer | |
| 27 // once any animation completes. Note that layer() will remain valid until the | |
| 28 // end of ~LayerOwner(). | |
| 29 scoped_ptr<Layer> AcquireLayer(); | |
| 30 | |
| 31 // Asks the owner to recreate the layer, returning the old Layer. NULL is | |
| 32 // returned if there is no existing layer, or recreate is not supported. | |
| 33 // | |
| 34 // This does not recurse. Existing children of the layer are moved to the new | |
| 35 // layer. | |
| 36 scoped_ptr<Layer> RecreateLayer(); | |
| 37 | |
| 38 ui::Layer* layer() { return layer_; } | |
| 39 const ui::Layer* layer() const { return layer_; } | |
| 40 | |
| 41 void set_layer_owner_delegate(LayerOwnerDelegate* delegate) { | |
| 42 layer_owner_delegate_ = delegate; | |
| 43 } | |
| 44 | |
| 45 protected: | |
| 46 void DestroyLayer(); | |
| 47 | |
| 48 bool OwnsLayer() const; | |
| 49 | |
| 50 private: | |
| 51 // The LayerOwner owns its layer unless ownership is relinquished via a call | |
| 52 // to AcquireLayer(). After that moment |layer_| will still be valid but | |
| 53 // |layer_owner_| will be NULL. The reason for releasing ownership is that | |
| 54 // the client may wish to animate the layer beyond the lifetime of the owner, | |
| 55 // e.g. fading it out when it is destroyed. | |
| 56 scoped_ptr<Layer> layer_owner_; | |
| 57 Layer* layer_; | |
| 58 | |
| 59 LayerOwnerDelegate* layer_owner_delegate_; | |
| 60 | |
| 61 DISALLOW_COPY_AND_ASSIGN(LayerOwner); | |
| 62 }; | |
| 63 | |
| 64 } // namespace ui | |
| 65 | |
| 66 #endif // UI_COMPOSITOR_LAYER_OWNER_H_ | |
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