content/browser/android/joystick_scroll_provider.cc - Issue 2770613002: Forward GenericMotionEvent to EventForwarder

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Issue 2770613002: Forward GenericMotionEvent to EventForwarder (Closed)

Patch Set: comments Created 3 years, 8 months ago

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1 // Copyright 2016 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 #include "content/browser/android/joystick_scroll_provider.h"

6

7 #include "base/supports_user_data.h"

8 #include "content/browser/renderer_host/input/web_input_event_builders_android.h "

9 #include "content/browser/renderer_host/render_widget_host_view_android.h"

10 #include "content/browser/web_contents/web_contents_impl.h"

11 #include "jni/JoystickScrollProvider_jni.h"

12

13 using base::android::AttachCurrentThread;

14 using base::android::JavaRef;

15 using base::android::ScopedJavaLocalRef;

16

17 namespace content {

18

19 const void* const kJoystickScrollUserDataKey = &kJoystickScrollUserDataKey;

20

21 namespace {

22 const double MILLISECONDS_IN_SECOND = 1000.0;

23 }

24

25 // A helper class to attach JoystickScrollProvider to the WebContents.

26 class JoystickScrollProvider::UserData : public base::SupportsUserData::Data {

27 public:

28 explicit UserData(JoystickScrollProvider* rep) : rep_(rep) {}

29

30 private:

31 std::unique_ptr<JoystickScrollProvider> rep_;

32

33 DISALLOW_IMPLICIT_CONSTRUCTORS(UserData);

34 };

35

36 jlong Init(JNIEnv* env,

37 const base::android::JavaParamRef<jobject>& obj,

38 const base::android::JavaParamRef<jobject>& jweb_contents) {

39 WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(

40 WebContents::FromJavaWebContents(jweb_contents));

41 CHECK(web_contents)

42 << "A JoystickScrollProvider should be created with a valid WebContents.";

43

44 DCHECK(!web_contents->GetUserData(kJoystickScrollUserDataKey))

45 << "WebContents already has JoystickScrollProvider attached";

46

47 JoystickScrollProvider* native_object =

48 new JoystickScrollProvider(env, obj, web_contents);

49 return reinterpret_cast<intptr_t>(native_object);

50 }

51

52 JoystickScrollProvider::JoystickScrollProvider(JNIEnv* env,

53 const JavaRef<jobject>& obj,

54 WebContentsImpl* web_contents)

55 : java_ref_(env, obj), web_contents_(web_contents) {

56 web_contents_->SetUserData(kJoystickScrollUserDataKey, new UserData(this));

57 }

58

59 JoystickScrollProvider::~JoystickScrollProvider() {

60 JNIEnv* env = AttachCurrentThread();

61 ScopedJavaLocalRef<jobject> j_obj = java_ref_.get(env);

62 java_ref_.reset();

63 if (!j_obj.is_null()) {

64 Java_JoystickScrollProvider_onNativeObjectDestroyed(

65 env, j_obj, reinterpret_cast<intptr_t>(this));

66 }

67 }

68

69 void JoystickScrollProvider::ScrollBy(

70 JNIEnv* env,

71 const base::android::JavaParamRef<jobject>& obj,

72 jlong time_ms,

73 jfloat dx_dip,

74 jfloat dy_dip) {

75 if (!web_contents_)

76 return;

77

78 RenderWidgetHostViewAndroid* rwhv = static_cast<RenderWidgetHostViewAndroid*>(

79 web_contents_->GetRenderWidgetHostView());

80 if (!rwhv)

81 return;

82

83 if (!dx_dip && !dy_dip)

84 return;

85

86 // Revert the direction for syntheric mouse wheel event.

87 blink::WebMouseWheelEvent event = WebMouseWheelEventBuilder::Build(

88 -dx_dip, -dy_dip, 1.0, time_ms / MILLISECONDS_IN_SECOND, 0, 0);

89

90 rwhv->SendMouseWheelEvent(event);

91 }

92

93 bool RegisterJoystickScrollProvider(JNIEnv* env) {

94 return RegisterNativesImpl(env);

95 }

96

97 } // namespace content

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