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      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
      3 // found in the LICENSE file.
      4 
      5 #include "content/browser/renderer_host/input/synthetic_gesture_target_android.h"
      6 
      7 #include "content/browser/android/content_view_core_impl.h"
      8 #include "content/browser/renderer_host/render_widget_host_impl.h"
      9 #include "jni/TouchEventSynthesizer_jni.h"
     10 #include "third_party/WebKit/public/web/WebInputEvent.h"
     11 #include "ui/gfx/android/view_configuration.h"
     12 #include "ui/gfx/screen.h"
     13 
     14 using blink::WebTouchEvent;
     15 
     16 namespace content {
     17 
     18 SyntheticGestureTargetAndroid::SyntheticGestureTargetAndroid(
     19     RenderWidgetHostImpl* host,
     20     base::android::ScopedJavaLocalRef<jobject> touch_event_synthesizer)
     21     : SyntheticGestureTargetBase(host),
     22       touch_event_synthesizer_(touch_event_synthesizer) {
     23   DCHECK(!touch_event_synthesizer_.is_null());
     24 }
     25 
     26 SyntheticGestureTargetAndroid::~SyntheticGestureTargetAndroid() {
     27 }
     28 
     29 bool SyntheticGestureTargetAndroid::RegisterTouchEventSynthesizer(JNIEnv* env) {
     30   return RegisterNativesImpl(env);
     31 }
     32 
     33 void SyntheticGestureTargetAndroid::TouchSetPointer(
     34     JNIEnv* env, int index, int x, int y, int id) {
     35   TRACE_EVENT0("input", "SyntheticGestureTargetAndroid::TouchSetPointer");
     36   Java_TouchEventSynthesizer_setPointer(env, touch_event_synthesizer_.obj(),
     37                                       index, x, y, id);
     38 }
     39 
     40 void SyntheticGestureTargetAndroid::TouchInject(
     41     JNIEnv* env, Action action, int pointer_count, int64 time_in_ms) {
     42   TRACE_EVENT0("input", "SyntheticGestureTargetAndroid::TouchInject");
     43   Java_TouchEventSynthesizer_inject(env, touch_event_synthesizer_.obj(),
     44                                     static_cast<int>(action), pointer_count,
     45                                     time_in_ms);
     46 }
     47 
     48 void SyntheticGestureTargetAndroid::DispatchWebTouchEventToPlatform(
     49     const blink::WebTouchEvent& web_touch, const ui::LatencyInfo&) {
     50   JNIEnv* env = base::android::AttachCurrentThread();
     51 
     52   SyntheticGestureTargetAndroid::Action action =
     53       SyntheticGestureTargetAndroid::ActionInvalid;
     54   switch (web_touch.type) {
     55     case blink::WebInputEvent::TouchStart:
     56       action = SyntheticGestureTargetAndroid::ActionStart;
     57       break;
     58     case blink::WebInputEvent::TouchMove:
     59       action = SyntheticGestureTargetAndroid::ActionMove;
     60       break;
     61     case blink::WebInputEvent::TouchCancel:
     62       action = SyntheticGestureTargetAndroid::ActionCancel;
     63       break;
     64     case blink::WebInputEvent::TouchEnd:
     65       action = SyntheticGestureTargetAndroid::ActionEnd;
     66       break;
     67     default:
     68       NOTREACHED();
     69   }
     70   const unsigned num_touches = web_touch.touchesLength;
     71   for (unsigned i = 0; i < num_touches; ++i) {
     72     const blink::WebTouchPoint* point = &web_touch.touches[i];
     73     TouchSetPointer(env, i, point->position.x, point->position.y, point->id);
     74   }
     75 
     76   TouchInject(env, action, num_touches,
     77               static_cast<int64>(web_touch.timeStampSeconds * 1000.0));
     78 }
     79 
     80 void SyntheticGestureTargetAndroid::DispatchWebMouseWheelEventToPlatform(
     81     const blink::WebMouseWheelEvent& web_wheel, const ui::LatencyInfo&) {
     82   CHECK(false);
     83 }
     84 
     85 void SyntheticGestureTargetAndroid::DispatchWebMouseEventToPlatform(
     86     const blink::WebMouseEvent& web_mouse, const ui::LatencyInfo&) {
     87   CHECK(false);
     88 }
     89 
     90 SyntheticGestureParams::GestureSourceType
     91 SyntheticGestureTargetAndroid::GetDefaultSyntheticGestureSourceType() const {
     92   return SyntheticGestureParams::TOUCH_INPUT;
     93 }
     94 
     95 float SyntheticGestureTargetAndroid::GetTouchSlopInDips() const {
     96   float device_scale_factor =
     97       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().device_scale_factor();
     98   return gfx::ViewConfiguration::GetTouchSlopInPixels() / device_scale_factor;
     99 }
    100 
    101 float SyntheticGestureTargetAndroid::GetMinScalingSpanInDips() const {
    102   float device_scale_factor =
    103       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().device_scale_factor();
    104   return
    105       gfx::ViewConfiguration::GetMinScalingSpanInPixels() / device_scale_factor;
    106 }
    107 
    108 }  // namespace content
    109