Extract content dependency from keyboard code

ui/keyboard/content/keyboard_ui_content.cc

+// Copyright (c) 2013 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/keyboard/content/keyboard_ui_content.h"
+
+#include "base/command_line.h"
+#include "base/values.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/render_widget_host_iterator.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/common/bindings_policy.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/text_input_client.h"
+#include "ui/keyboard/content/keyboard_constants.h"
+#include "ui/keyboard/keyboard_controller.h"
+#include "ui/keyboard/keyboard_switches.h"
+#include "ui/keyboard/keyboard_util.h"
+#include "ui/wm/core/shadow.h"
+
+namespace {
+
+// The WebContentsDelegate for the keyboard.
+// The delegate deletes itself when the keyboard is destroyed.
+class KeyboardContentsDelegate : public content::WebContentsDelegate,
+                                 public content::WebContentsObserver {
+ public:
+  explicit KeyboardContentsDelegate(keyboard::KeyboardUIContent* ui)
+      : ui_(ui) {}
+  ~KeyboardContentsDelegate() override {}
+
+ private:
+  // Overridden from content::WebContentsDelegate:
+  content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) override {
+    source->GetController().LoadURL(
+        params.url, params.referrer, params.transition, params.extra_headers);
+    Observe(source);
+    return source;
+  }
+
+  bool CanDragEnter(content::WebContents* source,
+                    const content::DropData& data,
+                    blink::WebDragOperationsMask operations_allowed) override {
+    return false;
+  }
+
+  bool ShouldCreateWebContents(
+      content::WebContents* web_contents,
+      int route_id,
+      int main_frame_route_id,
+      WindowContainerType window_container_type,
+      const std::string& frame_name,
+      const GURL& target_url,
+      const std::string& partition_id,
+      content::SessionStorageNamespace* session_storage_namespace) override {
+    return false;
+  }
+
+  bool IsPopupOrPanel(const content::WebContents* source) const override {
+    return true;
+  }
+
+  void MoveContents(content::WebContents* source,
+                    const gfx::Rect& pos) override {
+    aura::Window* keyboard = ui_->GetKeyboardWindow();
+    // keyboard window must have been added to keyboard container window at this
+    // point. Otherwise, wrong keyboard bounds is used and may cause problem as
+    // described in crbug.com/367788.
+    DCHECK(keyboard->parent());
+    // keyboard window bounds may not set to |pos| after this call. If keyboard
+    // is in FULL_WIDTH mode, only the height of keyboard window will be
+    // changed.
+    keyboard->SetBounds(pos);
+  }
+
+  // Overridden from content::WebContentsDelegate:
+  void RequestMediaAccessPermission(
+      content::WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback) override {
+    ui_->RequestAudioInput(web_contents, request, callback);
+  }
+
+  // Overridden from content::WebContentsObserver:
+  void WebContentsDestroyed() override { delete this; }
+
+  keyboard::KeyboardUIContent* ui_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyboardContentsDelegate);
+};
+
+}  // namespace
+
+namespace keyboard {
+
+class WindowBoundsChangeObserver : public aura::WindowObserver {
+ public:
+  explicit WindowBoundsChangeObserver(KeyboardUIContent* ui) : ui_(ui) {}
+  ~WindowBoundsChangeObserver() override {}
+
+  void AddObservedWindow(aura::Window* window) {
+    if (!window->HasObserver(this)) {
+      window->AddObserver(this);
+      observed_windows_.insert(window);
+    }
+  }
+  void RemoveAllObservedWindows() {
+    for (std::set<aura::Window*>::iterator it = observed_windows_.begin();
+         it != observed_windows_.end(); ++it)
+      (*it)->RemoveObserver(this);
+    observed_windows_.clear();
+  }
+
+ private:
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override {
+    ui_->UpdateInsetsForWindow(window);
+  }
+  void OnWindowDestroyed(aura::Window* window) override {
+    if (window->HasObserver(this))
+      window->RemoveObserver(this);
+    observed_windows_.erase(window);
+  }
+
+  KeyboardUIContent* ui_;
+  std::set<aura::Window*> observed_windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowBoundsChangeObserver);
+};
+
+KeyboardUIContent::KeyboardUIContent(content::BrowserContext* context)
+    : browser_context_(context),
+      default_url_(kKeyboardURL),
+      window_bounds_observer_(new WindowBoundsChangeObserver(this)) {
+}
+
+KeyboardUIContent::~KeyboardUIContent() {
+  ResetInsets();
+}
+
+void KeyboardUIContent::LoadSystemKeyboard() {
+  DCHECK(keyboard_contents_);
+  if (keyboard_contents_->GetURL() != default_url_) {
+    // TODO(bshe): The height of system virtual keyboard and IME virtual
+    // keyboard may different. The height needs to be restored too.
+    LoadContents(default_url_);
+  }
+}
+
+void KeyboardUIContent::UpdateInsetsForWindow(aura::Window* window) {
+  aura::Window* keyboard_window = GetKeyboardWindow();
+  scoped_ptr<content::RenderWidgetHostIterator> widgets(
+      content::RenderWidgetHost::GetRenderWidgetHosts());
+  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
+    content::RenderWidgetHostView* view = widget->GetView();
+    if (view && window->Contains(view->GetNativeView())) {
+      gfx::Rect window_bounds = view->GetNativeView()->GetBoundsInScreen();
+      gfx::Rect intersect =
+          gfx::IntersectRects(window_bounds, keyboard_window->bounds());
+      int overlap = ShouldEnableInsets(window) ? intersect.height() : 0;
+      if (overlap > 0 && overlap < window_bounds.height())
+        view->SetInsets(gfx::Insets(0, 0, overlap, 0));
+      else
+        view->SetInsets(gfx::Insets());
+      return;
+    }
+  }
+}
+
+aura::Window* KeyboardUIContent::GetKeyboardWindow() {
+  if (!keyboard_contents_) {
+    content::BrowserContext* context = browser_context();
+    keyboard_contents_.reset(content::WebContents::Create(
+        content::WebContents::CreateParams(context,
+            content::SiteInstance::CreateForURL(context,
+                                                GetVirtualKeyboardUrl()))));
+    keyboard_contents_->SetDelegate(new KeyboardContentsDelegate(this));
+    SetupWebContents(keyboard_contents_.get());
+    LoadContents(GetVirtualKeyboardUrl());
+    keyboard_contents_->GetNativeView()->AddObserver(this);
+  }
+
+  return keyboard_contents_->GetNativeView();
+}
+
+bool KeyboardUIContent::HasKeyboardWindow() const {
+  return keyboard_contents_;
+}
+
+void KeyboardUIContent::ReloadKeyboardIfNeeded() {
+  DCHECK(keyboard_contents_);
+  if (keyboard_contents_->GetURL() != GetVirtualKeyboardUrl()) {
+    if (keyboard_contents_->GetURL().GetOrigin() !=
+        GetVirtualKeyboardUrl().GetOrigin()) {
+      // Sets keyboard window rectangle to 0 and close current page before
+      // navigate to a keyboard in a different extension. This keeps the UX the
+      // same as Android. Note we need to explicitly close current page as it
+      // might try to resize keyboard window in javascript on a resize event.
+      GetKeyboardWindow()->SetBounds(gfx::Rect());
+      keyboard_contents_->ClosePage();
+      keyboard_controller()->SetKeyboardMode(FULL_WIDTH);
+    }
+    LoadContents(GetVirtualKeyboardUrl());
+  }
+}
+
+void KeyboardUIContent::InitInsets(const gfx::Rect& new_bounds) {
+  // Adjust the height of the viewport for visible windows on the primary
+  // display.
+  // TODO(kevers): Add EnvObserver to properly initialize insets if a
+  // window is created while the keyboard is visible.
+  scoped_ptr<content::RenderWidgetHostIterator> widgets(
+      content::RenderWidgetHost::GetRenderWidgetHosts());
+  aura::Window* keyboard_window = GetKeyboardWindow();
+  aura::Window* root_window = keyboard_window->GetRootWindow();
+  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
+    content::RenderWidgetHostView* view = widget->GetView();
+    // Can be NULL, e.g. if the RenderWidget is being destroyed or
+    // the render process crashed.
+    if (view) {
+      aura::Window* window = view->GetNativeView();
+      // If virtual keyboard failed to load, a widget that displays error
+      // message will be created and adds as a child of the virtual keyboard
+      // window. We want to avoid add BoundsChangedObserver to that window.
+      if (!keyboard_window->Contains(window) &&
+          window->GetRootWindow() == root_window) {
+        gfx::Rect window_bounds = window->GetBoundsInScreen();
+        gfx::Rect intersect = gfx::IntersectRects(window_bounds,
+                                                  new_bounds);
+        int overlap = intersect.height();
+        if (overlap > 0 && overlap < window_bounds.height())
+          view->SetInsets(gfx::Insets(0, 0, overlap, 0));
+        else
+          view->SetInsets(gfx::Insets());
+        AddBoundsChangedObserver(window);
+      }
+    }
+  }
+}
+
+void KeyboardUIContent::ResetInsets() {
+  const gfx::Insets insets;
+  scoped_ptr<content::RenderWidgetHostIterator> widgets(
+      content::RenderWidgetHost::GetRenderWidgetHosts());
+  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
+    content::RenderWidgetHostView* view = widget->GetView();
+    if (view)
+      view->SetInsets(insets);
+  }
+  window_bounds_observer_->RemoveAllObservedWindows();
+}
+
+void KeyboardUIContent::SetupWebContents(content::WebContents* contents) {
+}
+
+void KeyboardUIContent::OnWindowBoundsChanged(aura::Window* window,
+                                              const gfx::Rect& old_bounds,
+                                              const gfx::Rect& new_bounds) {
+  if (!shadow_) {
+    shadow_.reset(new wm::Shadow());
+    shadow_->Init(wm::Shadow::STYLE_ACTIVE);
+    shadow_->layer()->SetVisible(true);
+    DCHECK(keyboard_contents_->GetNativeView()->parent());
+    keyboard_contents_->GetNativeView()->parent()->layer()->Add(
+        shadow_->layer());
+  }
+
+  shadow_->SetContentBounds(new_bounds);
+}
+
+void KeyboardUIContent::OnWindowDestroyed(aura::Window* window) {
+  window->RemoveObserver(this);
+}
+
+void KeyboardUIContent::LoadContents(const GURL& url) {
+  if (keyboard_contents_) {
+    content::OpenURLParams params(
+        url,
+        content::Referrer(),
+        SINGLETON_TAB,
+        ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
+        false);
+    keyboard_contents_->OpenURL(params);
+  }
+}
+
+const GURL& KeyboardUIContent::GetVirtualKeyboardUrl() {
+  if (keyboard::IsInputViewEnabled()) {
+    const GURL& override_url = GetOverrideContentUrl();
+    return override_url.is_valid() ? override_url : default_url_;
+  } else {
+    return default_url_;
+  }
+}
+
+bool KeyboardUIContent::ShouldEnableInsets(aura::Window* window) {
+  aura::Window* keyboard_window = GetKeyboardWindow();
+  return (keyboard_window->GetRootWindow() == window->GetRootWindow() &&
+          keyboard::IsKeyboardOverscrollEnabled() &&
+          keyboard_window->IsVisible() &&
+          keyboard_controller()->keyboard_visible());
+}
+
+void KeyboardUIContent::AddBoundsChangedObserver(aura::Window* window) {
+  aura::Window* target_window = window ? window->GetToplevelWindow() : nullptr;
+  if (target_window)
+    window_bounds_observer_->AddObservedWindow(target_window);
+}
+
+}  // namespace keyboard