Introduce ViewRoot forwarding input/view events to native

ui/android/view_android.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/android/view_android.h"
 
 #include <algorithm>
 
 #include "base/android/jni_android.h"
 #include "cc/layers/layer.h"
 #include "jni/ViewAndroidDelegate_jni.h"
+#include "ui/android/view_client.h"
 #include "ui/android/window_android.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 
 namespace ui {
 
 using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
+// ViewAndroid::ScopedAndroidView
 ViewAndroid::ScopedAnchorView::ScopedAnchorView(
     JNIEnv* env,
     const JavaRef<jobject>& jview,
     const JavaRef<jobject>& jdelegate)
     : view_(env, jview.obj()), delegate_(env, jdelegate.obj()) {
   // If there's a view, then we need a delegate to remove it.
   DCHECK(!jdelegate.is_null() || jview.is_null());
 }
 
 ViewAndroid::ScopedAnchorView::ScopedAnchorView() { }
@@ skipping 30 matching lines @@
   view_.reset();
   delegate_.reset();
 }
 
 const base::android::ScopedJavaLocalRef<jobject>
 ViewAndroid::ScopedAnchorView::view() const {
   JNIEnv* env = base::android::AttachCurrentThread();
   return view_.get(env);
 }
 
-ViewAndroid::ViewAndroid(const JavaRef<jobject>& delegate)
-    : parent_(nullptr)
-    , delegate_(base::android::AttachCurrentThread(),
-                delegate.obj()) {}
+// ViewAndroid::Bounds
+void ViewAndroid::Bounds::SetBounds(const gfx::Point& origin,
+                                    int width,
+                                    int height) {
+  origin_.set_x(origin.x());
+  origin_.set_y(origin.y());
+  width_ = width;
+  height_ = height;
+}
 
-ViewAndroid::ViewAndroid() : parent_(nullptr) {}
+bool ViewAndroid::Bounds::IsInBounds(const MotionEventAndroid& event) {
+  bool width_matched = (width_ == Bounds::kMatchParent) ? true :
+      origin_.x() <= event.GetX(0) && event.GetX(0) < origin_.x() + width_;
+  bool height_matched = (height_ == Bounds::kMatchParent) ? true:
+      origin_.y() <=  event.GetY(0) && event.GetY(0) < (origin_.y() + height_);
+
+  return width_matched && height_matched;
+}
+
+// ViewAndroid
+ViewAndroid::ViewAndroid(ViewClient* client) : parent_(nullptr),
+                                               client_(client) {}
+ViewAndroid::ViewAndroid() : ViewAndroid(nullptr) {}
 
 ViewAndroid::~ViewAndroid() {
   RemoveFromParent();
 
-  for (std::list<ViewAndroid*>::iterator it = children_.begin();
-       it != children_.end(); it++) {
-    DCHECK_EQ((*it)->parent_, this);
-    (*it)->parent_ = nullptr;
+  for (auto& child : children_) {
+    DCHECK_EQ(child->parent_, this);
+    child->parent_ = nullptr;
   }
 }
 
 void ViewAndroid::SetDelegate(const JavaRef<jobject>& delegate) {
+  // A ViewAndroid may have its own delegate or otherwise will
+  // use the next available parent's delegate.
   JNIEnv* env = base::android::AttachCurrentThread();
   delegate_ = JavaObjectWeakGlobalRef(env, delegate);
 }
 
 void ViewAndroid::AddChild(ViewAndroid* child) {
   DCHECK(child);
+  DCHECK(!child->IsViewRoot());  // ViewRoot cannot be a child.
   DCHECK(std::find(children_.begin(), children_.end(), child) ==
          children_.end());
 
-  children_.push_back(child);
+  children_.push_front(child);
   if (child->parent_)
     child->RemoveFromParent();
   child->parent_ = this;
 }
 
 void ViewAndroid::RemoveFromParent() {
   if (parent_)
     parent_->RemoveChild(this);
 }
 
+void ViewAndroid::SetBounds(const gfx::Point& origin, int width, int height) {
+  bounds_.SetBounds(origin, width, height);
+  for (auto& child: children_) {
+    child->SetBounds(origin, Bounds::kMatchParent, Bounds::kMatchParent);

[boliu, 2017/01/17 16:17:28]

this makes no sense to me, why are children automatically switched to
matchparent?

[Jinsuk Kim, 2017/01/17 23:32:47]

VA for RWHVA is supposed to have the same layout as that of WCVA. So if the
event matches WCVA then it should also match RWHVA.

+  }
+}
+
+bool ViewAndroid::IsInBounds(const MotionEventAndroid& event) {
+  return bounds_.IsInBounds(event);
+}
+
 ViewAndroid::ScopedAnchorView ViewAndroid::AcquireAnchorView() {
   ScopedJavaLocalRef<jobject> delegate(GetViewAndroidDelegate());
   if (delegate.is_null())
     return ViewAndroid::ScopedAnchorView();
 
   JNIEnv* env = base::android::AttachCurrentThread();
   return ViewAndroid::ScopedAnchorView(
       env, Java_ViewAndroidDelegate_acquireView(env, delegate), delegate);
 }
 
@@ skipping 40 matching lines @@
 }
 
 cc::Layer* ViewAndroid::GetLayer() const {
   return layer_.get();
 }
 
 void ViewAndroid::SetLayer(scoped_refptr<cc::Layer> layer) {
   layer_ = layer;
 }
 
+ViewAndroid* ViewAndroid::GetViewRoot() {
+  return parent_ ? parent_->GetViewRoot() : nullptr;
+}
+
+bool ViewAndroid::IsViewRoot() {
+  return GetViewRoot() == this;
+}
+
 bool ViewAndroid::StartDragAndDrop(const JavaRef<jstring>& jtext,
                                    const JavaRef<jobject>& jimage) {
   ScopedJavaLocalRef<jobject> delegate(GetViewAndroidDelegate());
   if (delegate.is_null())
     return false;
   JNIEnv* env = base::android::AttachCurrentThread();
   return Java_ViewAndroidDelegate_startDragAndDrop(env, delegate, jtext,
                                                    jimage);
 }
 
+bool ViewAndroid::OnTouchEventInternal(const MotionEventAndroid& event,
+                                       bool is_touch_handle_event) {
+  if (client_ && IsInBounds(event)) {
+    if (client_->OnTouchEvent(event, is_touch_handle_event))
+      return true;
+  }
+
+  for (auto& child: children_) {
+    if (child->OnTouchEventInternal(event, is_touch_handle_event))

[boliu, 2017/01/17 16:17:28]

when recursing, need to translate the event by -origin

[Jinsuk Kim, 2017/01/17 23:32:47]

As I mentioned in the TODO, origin remains zero at this point. Will reflect it
as the TODO's are resolved.

+      return true;
+  }
+  return false;
+}
+
 }  // namespace ui