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Side by Side Diff: content/browser/renderer_host/input/synthetic_gesture.h

Issue 1884883005: Prepare SyntheticPointerAction to handle touch actions for multiple fingers (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: return nullptr Created 4 years, 5 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved. 1 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_ 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_ 6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
7 7
8 #include <memory> 8 #include <memory>
9 9
10 #include "base/macros.h" 10 #include "base/macros.h"
11 #include "base/time/time.h" 11 #include "base/time/time.h"
12 #include "content/common/content_export.h" 12 #include "content/common/content_export.h"
13 #include "content/common/input/synthetic_gesture_params.h" 13 #include "content/common/input/synthetic_gesture_params.h"
14 14
15 namespace content { 15 namespace content {
16 16
17 class SyntheticGestureTarget; 17 class SyntheticGestureTarget;
18 18
19 // Base class for synthetic gesture implementations. A synthetic gesture class 19 // Base class for synthetic gesture implementations. A synthetic gesture class
20 // is responsible for forwaring InputEvents, simulating the gesture, to a 20 // is responsible for forwarding InputEvents, simulating the gesture, to a
21 // SyntheticGestureTarget. 21 // SyntheticGestureTarget.
22 // 22 //
23 // Adding new gesture types involved the following steps: 23 // Adding new gesture types involved the following steps:
24 // 1) Create a sub-type of SyntheticGesture that implements the gesture. 24 // 1) Create a sub-type of SyntheticGesture that implements the gesture.
25 // 2) Extend SyntheticGesture::Create with the new class. 25 // 2) Extend SyntheticGesture::Create with the new class.
26 // 3) Add at least one unit test per supported input source type (touch, 26 // 3) Add at least one unit test per supported input source type (touch,
27 // mouse, etc) to SyntheticGestureController unit tests. The unit tests 27 // mouse, etc) to SyntheticGestureController unit tests. The unit tests
28 // only checks basic functionality and termination. If the gesture is 28 // only checks basic functionality and termination. If the gesture is
29 // hooked up to Telemetry its correctness can additionally be tested there. 29 // hooked up to Telemetry its correctness can additionally be tested there.
30 class CONTENT_EXPORT SyntheticGesture { 30 class CONTENT_EXPORT SyntheticGesture {
31 public: 31 public:
32 SyntheticGesture(); 32 SyntheticGesture();
33 virtual ~SyntheticGesture(); 33 virtual ~SyntheticGesture();
34 34
35 static std::unique_ptr<SyntheticGesture> Create( 35 static std::unique_ptr<SyntheticGesture> Create(
36 const SyntheticGestureParams& gesture_params); 36 const SyntheticGestureParams& gesture_params);
37 37
38 enum Result { 38 enum Result {
39 GESTURE_RUNNING, 39 GESTURE_RUNNING,
40 GESTURE_FINISHED, 40 GESTURE_FINISHED,
41 // Received when the user input parameters for SyntheticPointerAction are
42 // invalid.
43 POINTER_ACTION_INPUT_INVALID,
41 GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED, 44 GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED,
42 GESTURE_RESULT_MAX = GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED 45 GESTURE_RESULT_MAX = GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED
43 }; 46 };
44 47
45 // Update the state of the gesture and forward the appropriate events to the 48 // Update the state of the gesture and forward the appropriate events to the
46 // platform. This function is called repeatedly by the synthetic gesture 49 // platform. This function is called repeatedly by the synthetic gesture
47 // controller until it stops returning GESTURE_RUNNING. 50 // controller until it stops returning GESTURE_RUNNING.
48 virtual Result ForwardInputEvents( 51 virtual Result ForwardInputEvents(
49 const base::TimeTicks& timestamp, SyntheticGestureTarget* target) = 0; 52 const base::TimeTicks& timestamp, SyntheticGestureTarget* target) = 0;
50 53
51 protected: 54 protected:
52 DISALLOW_COPY_AND_ASSIGN(SyntheticGesture); 55 DISALLOW_COPY_AND_ASSIGN(SyntheticGesture);
53 }; 56 };
54 57
55 } // namespace content 58 } // namespace content
56 59
57 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_ 60 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_H_
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