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1 // Copyright 2011 The Chromium Authors. All rights reserved. | 1 // Copyright 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_INPUT_INPUT_HANDLER_H_ | 5 #ifndef CC_INPUT_INPUT_HANDLER_H_ |
6 #define CC_INPUT_INPUT_HANDLER_H_ | 6 #define CC_INPUT_INPUT_HANDLER_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
10 #include "cc/base/cc_export.h" | 10 #include "cc/base/cc_export.h" |
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44 private: | 44 private: |
45 DISALLOW_COPY_AND_ASSIGN(InputHandlerClient); | 45 DISALLOW_COPY_AND_ASSIGN(InputHandlerClient); |
46 }; | 46 }; |
47 | 47 |
48 // The InputHandler is a way for the embedders to interact with the impl thread | 48 // The InputHandler is a way for the embedders to interact with the impl thread |
49 // side of the compositor implementation. There is one InputHandler per | 49 // side of the compositor implementation. There is one InputHandler per |
50 // LayerTreeHost. To use the input handler, implement the InputHanderClient | 50 // LayerTreeHost. To use the input handler, implement the InputHanderClient |
51 // interface and bind it to the handler on the compositor thread. | 51 // interface and bind it to the handler on the compositor thread. |
52 class CC_EXPORT InputHandler { | 52 class CC_EXPORT InputHandler { |
53 public: | 53 public: |
54 enum ScrollStatus { ScrollOnMainThread, ScrollStarted, ScrollIgnored }; | 54 // Note these are used in a histogram. Do not reorder or delete existing |
| 55 // entries. |
| 56 enum ScrollStatus { |
| 57 ScrollOnMainThread = 0, |
| 58 ScrollStarted, |
| 59 ScrollIgnored, |
| 60 ScrollUnknown, |
| 61 // This must be the last entry. |
| 62 ScrollStatusCount |
| 63 }; |
55 enum ScrollInputType { Gesture, Wheel, NonBubblingGesture }; | 64 enum ScrollInputType { Gesture, Wheel, NonBubblingGesture }; |
56 | 65 |
57 // Binds a client to this handler to receive notifications. Only one client | 66 // Binds a client to this handler to receive notifications. Only one client |
58 // can be bound to an InputHandler. The client must live at least until the | 67 // can be bound to an InputHandler. The client must live at least until the |
59 // handler calls WillShutdown() on the client. | 68 // handler calls WillShutdown() on the client. |
60 virtual void BindToClient(InputHandlerClient* client) = 0; | 69 virtual void BindToClient(InputHandlerClient* client) = 0; |
61 | 70 |
62 // Selects a layer to be scrolled at a given point in viewport (logical | 71 // Selects a layer to be scrolled at a given point in viewport (logical |
63 // pixel) coordinates. Returns ScrollStarted if the layer at the coordinates | 72 // pixel) coordinates. Returns ScrollStarted if the layer at the coordinates |
64 // can be scrolled, ScrollOnMainThread if the scroll event should instead be | 73 // can be scrolled, ScrollOnMainThread if the scroll event should instead be |
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132 InputHandler() {} | 141 InputHandler() {} |
133 virtual ~InputHandler() {} | 142 virtual ~InputHandler() {} |
134 | 143 |
135 private: | 144 private: |
136 DISALLOW_COPY_AND_ASSIGN(InputHandler); | 145 DISALLOW_COPY_AND_ASSIGN(InputHandler); |
137 }; | 146 }; |
138 | 147 |
139 } // namespace cc | 148 } // namespace cc |
140 | 149 |
141 #endif // CC_INPUT_INPUT_HANDLER_H_ | 150 #endif // CC_INPUT_INPUT_HANDLER_H_ |
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