Create a unified UIElement interface for Widget, View and Window.

ash/devtools/view_element.cc

+// Copyright 2017 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 "ash/devtools/view_element.h"
+
+#include "ash/devtools/ui_element_delegate.h"
+#include "ash/wm_window.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+
+namespace devtools {
+
+namespace {
+
+int FindSibling(views::View* view) {
+  views::View* parent = view->parent();
+  int view_index = -1;
+  for (int i = 0, count = parent->child_count(); i < count; i++) {
+    if (view == parent->child_at(i)) {
+      view_index = i;
+      break;
+    }
+  }
+  DCHECK_GE(view_index, 0);
+  return view_index;
+}
+
+}  // namespace
+
+ViewElement::ViewElement(views::View* view,
+                         UIElementDelegate* ui_element_delegate,
+                         UIElement* parent)
+    : UIElement(UIElementType::VIEW, ui_element_delegate, parent), view_(view) {
+  if (!view_->HasObserver(this))
+    view_->AddObserver(this);
+}
+
+ViewElement::~ViewElement() {
+  if (view_ && view_->HasObserver(this))
+    view_->RemoveObserver(this);
+}
+
+views::View* ViewElement::view() {
+  return view_;
+}
+
+void ViewElement::OnChildViewRemoved(views::View* parent, views::View* view) {
+  if (parent == view_) {
+    for (auto* child_element : GetChildren()) {
+      if (UIElement::GetBackingElement<views::View, ViewElement>(
+              child_element) == view &&
+          delegate()->OnUIElementRemoved(child_element->GetNodeId())) {
+        child_element->RemoveChildFromParent();
+        child_element->Destroy();
+      }
+    }
+  }
+}
+
+void ViewElement::OnChildViewAdded(views::View* parent, views::View* view) {
+  if (parent == view_) {
+    delegate()->OnUIElementAdded(this, new ViewElement(view, delegate(), this),
+                                 LastChildIterator() - 1);
+  }
+}
+
+void ViewElement::OnChildViewReordered(views::View* parent, views::View* view) {
+  if (view == view_) {
+    RemoveChildFromParent();
+
+    int i = FindSibling(view);
+    std::vector<UIElement*>::iterator new_sibling_position =
+        GetParent()->BeginChildIterator();
+    while (i-- > 0)
+      new_sibling_position++;
+
+    GetParent()->AddChild(new_sibling_position, this);
+  }
+}
+
+void ViewElement::OnViewBoundsChanged(views::View* view) {
+  if (view_ == view)
+    delegate()->OnUIElementBoundsChanged(GetNodeId());
+}
+
+void ViewElement::Destroy() {
+  delete this;
+}
+
+bool ViewElement::GetBounds(gfx::Rect* bounds) {
+  if (view_) {
+    *bounds = view_->bounds();
+    return true;
+  }
+  return false;
+}
+
+bool ViewElement::SetBounds(const gfx::Rect& bounds) {
+  if (view_) {
+    view_->SetBoundsRect(bounds);
+    return true;
+  }
+  return false;
+}
+
+bool ViewElement::GetVisible(bool* visible) {
+  if (view_) {
+    *visible = view_->visible();
+    return true;
+  }
+  return false;
+}
+
+bool ViewElement::SetVisible(bool visible) {
+  if (view_) {
+    if (visible != view_->visible())
+      view_->SetVisible(visible);
+    return true;
+  }
+  return false;
+}
+
+std::pair<aura::Window*, gfx::Rect> ViewElement::GetNodeWindowAndBounds() {
+  if (view_)
+    return std::make_pair(view_->GetWidget()->GetNativeWindow(),
+                          view_->bounds());
+  return std::make_pair(nullptr, gfx::Rect());
+}
+
+// static
+views::View* ViewElement::From(UIElement* element) {
+  DCHECK_EQ(UIElementType::VIEW, element->GetType());
+  return static_cast<ViewElement*>(element)->view_;
+}
+
+}  // namespace devtools
+}  // namespace ash